CN111965709B - Building inspection device - Google Patents
Building inspection device Download PDFInfo
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- CN111965709B CN111965709B CN202010923353.4A CN202010923353A CN111965709B CN 111965709 B CN111965709 B CN 111965709B CN 202010923353 A CN202010923353 A CN 202010923353A CN 111965709 B CN111965709 B CN 111965709B
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- 238000007689 inspection Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 claims abstract description 116
- 238000001514 detection method Methods 0.000 claims abstract description 114
- 239000004020 conductor Substances 0.000 claims description 16
- 230000000295 complement effect Effects 0.000 claims description 7
- 239000002023 wood Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000001914 filtration Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Geophysics And Detection Of Objects (AREA)
Abstract
The application provides a building body detection device. The building body detection device comprises a first capacitor plate, a second capacitor plate, a third capacitor plate, a multi-frequency oscillating circuit, a logic gate circuit and a control circuit. The first capacitor electrode plate, the second capacitor electrode plate and the third capacitor electrode plate are arranged at intervals along the horizontal direction. The first capacitor plate, the third capacitor plate, the control circuit and the first end of the multi-frequency oscillating circuit are connected together. The second capacitor plate is electrically connected with the second end of the multi-frequency oscillating circuit. The logic gate circuit is electrically connected with the multi-frequency oscillating circuit and the control circuit respectively. The multi-frequency oscillating circuit is used for outputting a first square wave signal and a second square wave signal. The control circuit is used for calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit when no foreign matter is detected. After calibration, the logic gate outputs a first voltage according to the first square wave signal and the second square wave signal. The control circuit is used for determining whether foreign matters exist in the building body according to the first voltage and a preset voltage threshold value.
Description
Technical Field
The application relates to the technical field of building structure detection, in particular to a building structure detection device.
Background
At present, the construction of a building body is updated, modified or maintained, and the operation of cutting or drilling holes in a wall floor or the like is often required. In the existing house structure, the building body of the bearing mechanism such as walls, floors and the like needs to be internally provided with reinforcing structural strength such as reinforced wood beams and the like. The precise location of objects such as steel and wood beam wires hidden in a building body is generally unknown in the face of maintenance and reconstruction operations.
The existing traditional metal detection scheme can only identify and detect steel bars or steel plates in a building body, and can not detect non-iron foreign matters such as plastic water pipe wood beams.
Disclosure of Invention
Based on the above, it is necessary to provide a building body detection device for the problem that the existing metal detection scheme can only identify and detect the steel bars or steel plates in the building body and cannot detect non-iron foreign matters such as plastic water pipe wood beams.
The building detection device comprises a first capacitance polar plate, a second capacitance polar plate, a third capacitance polar plate, a multi-frequency oscillating circuit, a logic gate circuit and a control circuit;
The first capacitor plate, the second capacitor plate and the third capacitor plate are arranged at intervals along the horizontal direction, the output end of the first capacitor plate, the output end of the third capacitor plate, the first end of the control circuit and the first end of the multi-frequency oscillating circuit are commonly connected, the output end of the second capacitor plate is electrically connected with the second end of the multi-frequency oscillating circuit, the first end of the logic gate circuit is electrically connected with the third end of the multi-frequency oscillating circuit, the second end of the logic gate circuit is electrically connected with the fourth end of the multi-frequency oscillating circuit, and the third end of the logic gate circuit is electrically connected with the second end of the control circuit;
The multi-frequency oscillating circuit is used for outputting a first square wave signal according to detection signals of the first capacitor plate and the third capacitor plate, outputting a second square wave signal according to detection signals of the second capacitor plate, and when no foreign matter is detected, the control circuit is used for calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit, after calibration, the logic gate circuit outputs a first voltage according to the first square wave signal and the second square wave signal, and the control circuit is used for determining whether foreign matter exists in the building according to the first voltage and a preset voltage threshold.
In one embodiment, the control circuit is configured to compare the first voltage to the preset voltage threshold;
And if the first voltage is larger than the preset voltage threshold, determining that foreign matters exist in the building corresponding to the second capacitor plate currently.
In one embodiment, the calibration of the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit by the control circuit means:
The control circuit is used for outputting bias voltage and adjusting the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit based on the bias voltage so that the first square wave signal and the second square wave signal are complementary.
In one embodiment, the control circuit is further configured to acquire a plurality of the first voltages and calculate real-time variances of the plurality of the first voltages in a preset period, and determine the preset voltage threshold based on the real-time variances and a fixed offset.
In one embodiment, the building body detection device further includes:
The detection antenna is used for detecting the electrified conductor and outputting a detection signal;
the amplifying circuit is respectively and electrically connected with the detecting antenna and the third end of the control circuit and is used for amplifying the detecting signal and outputting the amplified detecting signal to the control circuit;
the control circuit determines whether a live conductor is present in the building based on the amplified detection signal.
In one embodiment, the control circuit calculates an amplitude according to the amplified detection signal, compares the amplitude with a preset amplitude threshold, and determines that a live conductor exists in the building corresponding to the current building detection device if the amplitude is greater than the preset amplitude threshold.
In one embodiment, the amplifying circuit includes:
The first end of the capacitor is electrically connected with the detection antenna;
The first end of the amplifier is electrically connected with the second end of the capacitor, and the second end of the amplifier is electrically connected with the third end of the control circuit;
A first resistor having a first end commonly connected to the first end of the amplifier and the second end of the capacitor, a second end electrically connected to the second end of the amplifier, and
And the first end of the bias circuit is used for being electrically connected with a power supply, the second end of the bias circuit is electrically connected with the third end of the amplifier, and the third end of the bias circuit is grounded.
In one embodiment, the control circuit includes:
A bias generator having a first end commonly connected to the output end of the first capacitor plate and the output end of the third capacitor plate for outputting a bias voltage and calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit based on the bias voltage when no foreign matter is detected, and
And the first end of the controller is electrically connected with the second end of the bias generator, the second end of the controller is electrically connected with the third end of the logic gate circuit, and the controller is used for determining whether foreign matters exist in the building body according to the first voltage and a preset voltage threshold value.
In one embodiment, the building body detection device further includes:
The first end of the second resistor is commonly connected with the output end of the first capacitor plate and the output end of the third capacitor plate, and the second end of the second resistor is electrically connected with the first end of the multi-frequency oscillating circuit.
In one embodiment, the building body detection device further includes:
And the first end of the third resistor is commonly connected with the output end of the second capacitor polar plate, and the second end of the third resistor is electrically connected with the second end of the multi-frequency oscillating circuit.
In one embodiment, the building body detection device further includes:
and the alarm is electrically connected with the fourth end of the control circuit.
In one embodiment, the building body detection device further includes:
and the first end of the filter circuit is electrically connected with the third end of the logic gate circuit, and the second end of the filter circuit is electrically connected with the second end of the control circuit.
Compared with the prior art, the building detection device outputs a first square wave signal according to the detection signals of the first capacitor plate and the third capacitor plate and outputs a second square wave signal according to the detection signals of the second capacitor plate through the multi-frequency oscillating circuit. And when no foreign matter is detected, the control circuit is used for calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit. After calibration, the logic gate circuit outputs a first voltage according to the first square wave signal and the second square wave signal. The control circuit determines whether foreign matters exist in the building body according to the first voltage and a preset voltage threshold value, so that non-iron foreign matters such as plastic water pipe wood beams and the like existing in the building body are accurately detected.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic circuit diagram of a building detection device according to an embodiment of the present application;
FIG. 2 is a diagram illustrating an equivalent capacitance detection scheme according to an embodiment of the present application;
FIG. 3 is a graph showing a dielectric constant distribution of a building containing hidden foreign matter according to an embodiment of the present application;
FIG. 4 is a diagram of a square wave signal after calibration according to an embodiment of the present application;
FIG. 5 is a schematic circuit diagram of a portion of a building detection device according to an embodiment of the present application;
fig. 6 is a schematic circuit diagram of a portion of a building detection device according to another embodiment of the present application.
Reference numerals illustrate:
10. The detection device comprises a building body detection device, 101, a building body, 110, a first capacitor electrode plate, 111, a second resistor, 120, a second capacitor electrode plate, 121, a third resistor, 130, a third capacitor electrode plate, 200, a multi-frequency oscillating circuit, 300, a logic gate circuit, 400, a control circuit, 410, a bias generator, 420, a controller, 500, a detection antenna, 600, an amplifying circuit, 601, a power supply, 610, a capacitor, 620, an amplifier, 630, a first resistor, 640, a bias circuit, 641, a fourth resistor, 642, a fifth resistor, 710, an alarm, 720 and a filter circuit.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the application, which is therefore not limited to the specific embodiments disclosed below.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a building detection device 10 for detecting foreign objects such as metal objects, water pipes, and wood hidden in a building 101. The building detection device 10 includes a first capacitor plate 110, a second capacitor plate 120, a third capacitor plate 130, a multi-frequency oscillating circuit 200, a logic gate circuit 300, and a control circuit 400. The first capacitor plate 110, the second capacitor plate 120 and the third capacitor plate 130 are arranged at intervals along the horizontal direction. The output end of the first capacitor plate 110, the output end of the third capacitor plate 130, the first end of the control circuit 400 and the first end of the multi-frequency oscillating circuit 200 are commonly connected. The output end of the second capacitor plate 120 is electrically connected to the second end of the multi-frequency oscillating circuit 200. The first end of the logic gate 300 is electrically connected to the third end of the multi-frequency oscillating circuit 200. The second terminal of the logic gate 300 is electrically connected to the fourth terminal of the multi-frequency oscillating circuit 200. A third terminal of the logic gate 300 is electrically connected to a second terminal of the control circuit 400.
The multi-frequency oscillating circuit 200 is configured to output a first square wave signal according to the detection signals of the first capacitor plate 110 and the third capacitor plate 130, and output a second square wave signal according to the detection signal of the second capacitor plate 120. The control circuit 400 is configured to calibrate the first square wave signal and the second square wave signal output from the multi-frequency oscillating circuit 200 when no foreign matter is detected. After calibration, the logic gate 300 outputs a first voltage according to the first square wave signal and the second square wave signal. The control circuit 400 is configured to determine whether a foreign object is present in the building 101 according to the first voltage and a preset voltage threshold.
In one embodiment, the area of the first capacitor plate 110 may be selected according to practical requirements, which is not limited herein. In one embodiment, the first capacitor plate 110 may be square, circular, etc. The same second capacitor plate 120 and the third capacitor plate 130 may have the same structure as the first capacitor plate 110. In one embodiment, the first capacitor plate 110, the second capacitor plate 120, and the third capacitor plate 130 may be disposed on a PCB (Printed Circuit Board ) board at intervals in a horizontal direction. When in use, the PCB is directly attached to the building 101.
It is understood that the specific circuit structure of the multi-frequency oscillating circuit 200 is not limited, as long as the multi-frequency oscillating circuit has the function of outputting a first square wave signal according to the detection signals of the first capacitor plate 110 and the third capacitor plate 130, and outputting a second square wave signal according to the detection signals of the second capacitor plate 120. In one embodiment, the multi-frequency oscillator circuit 200 may be composed of two multi-frequency oscillators. One of the multi-frequency oscillators may be configured to output the first square wave signal according to the detection signals of the first capacitor plate 110 and the third capacitor plate 130. The other multi-frequency oscillator may be configured to output the second square wave signal according to the detection signal of the second capacitor plate 120.
In one embodiment, the driving signal of the multi-frequency oscillating circuit 200 may be output through the control circuit 400. In one embodiment, the multi-frequency oscillator 200 and the logic gate 300 may be powered by a power module. Wherein the power module may be a dry cell, a storage battery, or the like.
It is understood that the specific circuit configuration of the control circuit 400 is not limited as long as it has a function of determining whether foreign matter exists in the building 101 according to the first voltage and a preset voltage threshold. In one embodiment, the control circuit 400 may be an MCU (micro control unit). In one embodiment, the control circuit 400 may be other integrated IC chips.
When the building body detection device 10 is in use, the dielectric constant of the building body 101 can be detected in real time by the capacitor plate group consisting of the first capacitor plate 110 and the third capacitor plate 130, and a first detection signal is output to the multi-frequency oscillating circuit 200. The multi-frequency oscillating circuit 200 can output the first square wave signal according to the first detection signal. The first detection signal is a voltage signal. Similarly, the building 101 can be detected in real time by the second capacitor plate 120, and a second detection signal is output to the multi-frequency oscillating circuit 200. The multi-frequency oscillating circuit 200 can output the second square wave signal according to the second detection signal. The second detection signal is a voltage signal.
The duty cycle in the square wave signal varies with the capacitance C because the duty cycle is controlled by the charge time constant of the capacitive plates (i.e., the first capacitive plate 110, the second capacitive plate 120, the third capacitive plate 130). The specific capacitance calculation formula is C=epsilon S/4 pi kd. Where pi and k are constants. The capacitance C is varied by the capacitance plate area S and the capacitance plate distance d and the dielectric constant epsilon. As shown in fig. 2, the capacitor plates are printed on a PCB board that is attached to the building 101. I.e. the capacitor plate is attached to the building 101. Meanwhile, the pole plate equivalent corresponding to the capacitor pole plate is at infinity, and the distance d is equivalent to a constant value. The area of the capacitor electrode plate is the area of printed copper of the PCB. The dielectric material is equivalent to the tested building 101, so the capacitance C is only affected by the dielectric constant epsilon (here the air dielectric constant change is ignored).
As can be seen from the above analysis, the dielectric constant of the building 101 can be reflected by indirectly measuring the capacitance value of the building. When other foreign materials such as water pipe, wood, metal, etc. are hidden in the building 101, the total dielectric constant is specific to the building dielectric constant (as shown in fig. 3). I.e. by measuring the capacitance of the building 101, it can be determined whether a hidden foreign object is present in the building 101. While the building body 101 capacitance value is linearly variable with the duty cycle in the square wave signals (i.e. the first square wave signal and the second square wave signal). That is, it is possible to determine whether or not the hidden foreign matter exists in the building body 101 by the square wave signal.
In one embodiment, after the multi-frequency oscillating circuit 200 outputs the first square wave signal and the second square wave signal, the first square wave signal and the second square wave signal may be calibrated first. Specifically, when the multi-frequency oscillating circuit 200 outputs the first square wave signal and the second square wave signal and the building 101 corresponding to the building detection device 10 does not hide the foreign matter at this time, the control circuit 400 may output a bias voltage, and adjust the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit 200 based on the bias voltage, so that the first square wave signal and the second square wave signal are complementary. I.e. calibration of the first square wave signal and the second square wave signal based on the bias voltage is achieved by the control circuit 400 such that the first square wave signal and the second square wave signal are fully complementary (as shown in fig. 4).
In one embodiment, if the first square wave signal and the second square wave signal are calibrated, and the building 101 corresponding to the building detection device 10 is hidden from foreign objects, the building detection device 10 may be moved to the building 101 where no foreign objects are hidden for calibration. After calibration, the logic gate circuit 300 may convert the first square wave signal and the second square wave signal into a square wave signal and output the first voltage. I.e. the logic gate 300 outputs the first voltage to the control circuit 400 at this time. In one embodiment, the logic gate 300 may be a nor gate.
In one embodiment, the control circuit 400 may compare the first voltage to the preset voltage threshold after receiving the first voltage. If the first voltage is greater than the preset voltage threshold, it is determined that a foreign object exists in the building 101 corresponding to the second capacitor plate 120. That is, the first capacitor plate 110, the second capacitor plate 120, and the third capacitor plate 130 move to the area with the foreign matter, at this time, the logic gate 300 outputs the first voltage to generate abrupt change, and the first voltage at the abrupt change is greater than the preset voltage threshold. Thus, it is determined that foreign matter is present in the area of the building 101 corresponding to the building detection device 10 at this time.
Otherwise, if the first voltage is less than or equal to the preset voltage threshold, it is determined that no foreign matter exists in the building 101 corresponding to the second capacitor plate 120. That is, no foreign matter is present in the area of the building 101 corresponding to the building detection device 10 at this time. At this time, the building detection device 10 may be moved to detect other areas of the building 101. Thus, the detection of whether the foreign matters such as metal objects, water pipes, wood and the like exist in the building body 101 can be realized through the logic, and the detection accuracy is improved. In one embodiment, the preset voltage threshold may be selected according to actual requirements, which is not limited herein by specific values.
In this embodiment, the multi-frequency oscillating circuit 200 outputs a first square wave signal according to the detection signals of the first capacitor plate 110 and the third capacitor plate 130, and outputs a second square wave signal according to the detection signal of the second capacitor plate 120. The first square wave signal and the second square wave signal output from the multi-frequency oscillating circuit 200 are calibrated by the control circuit 400 when no foreign matter is detected. After calibration, the logic gate 300 outputs a first voltage according to the first square wave signal and the second square wave signal. The control circuit 400 determines whether foreign matters exist in the building body 101 according to the first voltage and a preset voltage threshold value, so as to accurately detect non-ferrous foreign matters such as plastic water pipe wood beams and the like existing in the building body 101.
In one embodiment, the control circuit 400 is further configured to obtain a plurality of the first voltages and calculate real-time variances of the plurality of first voltages during a preset period, and determine the preset voltage threshold based on the real-time variances and a fixed offset. In one embodiment, the specific time of the preset period may be set according to actual requirements, for example, the preset period may be set to 20s, 30s, etc.
In one embodiment, since the capacitor plate is printed on the PCB board, the area of the capacitor plate changes due to thermal expansion and contraction of the PCB board, which may cause temperature drift during the testing process. Temperature drift can cause errors in the measurement of foreign objects. The control circuit 400 may acquire a plurality of the first voltages during the preset period and store the first voltages in the buffer memory space. And calculating real-time variance based on the acquired plurality of first voltages. If the real-time variance is smaller than the set variance threshold, it is determined that foreign matter has not been detected by the building detection device 10 at this time. At this time, the real-time variance and the fixed offset may be added to determine the preset voltage threshold for the next preset period. The logic can dynamically adjust the preset voltage threshold, so that the preset voltage threshold is always ensured to be in constant sensitivity, and the detection precision is improved.
Referring to fig. 5, in one embodiment, the building detection device 10 further includes a detection antenna 500 and an amplifying circuit 600. The detecting antenna 500 is used for detecting a charged conductor and outputting a detection signal. The amplifying circuit 600 is electrically connected to the third terminals of the detecting antenna 500 and the control circuit 400, respectively. The amplifying circuit 600 is configured to amplify the detection signal and output the amplified detection signal to the control circuit 400. The control circuit 400 determines whether a live conductor is present in the building 101 based on the amplified detection signal.
In one embodiment, the detection antenna 500 is an ac induction antenna. The ac induction antenna may be electrically connected to the amplifying circuit 600 by means of ac coupling. The detection antenna 500 detects a signal radiated from a charged conductor existing in the building 101, and outputs the detected signal to the amplifying circuit 600. The closer the detection antenna 500 is to the charged conductor, the stronger the intensity of the detection signal output from the detection antenna 500. The detection signal output from the detection antenna 500 is amplified by the amplifying circuit 600 and then output to the control circuit 400.
The control circuit 400 may determine whether a live conductor is present within the building 101 based on the amplified detection signal. Specifically, the control circuit 400 may calculate the amplitude of the detection signal according to the amplified detection signal, and compare the amplitude with a preset amplitude threshold. If the amplitude is greater than the preset amplitude threshold, it is determined that a live conductor exists in the area of the building 101 corresponding to the building detection device 10. Otherwise, if the amplitude is less than or equal to the preset amplitude threshold, it is determined that no live conductor exists in the area of the building 101 corresponding to the building detection device 10. In this way, whether the live conductor is hidden in the building 101 can be detected in real time in the above manner, so that the building detection device 10 can detect the live conductor. In one embodiment, the live conductor may be a live wire.
In one embodiment, the specific circuit topology of the amplifying circuit 600 is not limited, as long as the amplifying circuit has a function of amplifying the detection signal and outputting the amplified detection signal to the control circuit 400. In one embodiment, the amplifying circuit 600 may include a capacitor 610, an amplifier 620, a first resistor 630, and a bias circuit 640. Specifically, the first end of the capacitor 610 is electrically connected to the detecting antenna 500. The first terminal of the amplifier 620 is electrically connected to the second terminal of the capacitor 610. A second terminal of the amplifier 620 is electrically connected to a third terminal of the control circuit 400. A first terminal of the first resistor 630 is commonly connected to a first terminal of the amplifier 620 and a second terminal of the capacitor 610. A second terminal of the first resistor 630 is electrically connected to a second terminal of the amplifier 620. A first end of the bias circuit 640 is configured to be electrically connected to the power supply 601. A second terminal of the bias circuit 640 is electrically connected to a third terminal of the amplifier 620. The third terminal of the bias circuit 640 is grounded.
In one embodiment, the bias circuit 640 may include a fourth resistor 641 and a fifth resistor 642. Wherein a first end of the fourth resistor 641 is configured to be electrically connected to the power supply 601. The second terminal of the fourth resistor 641 is commonly connected to the first terminal of the fifth resistor 642 and the third terminal of the amplifier 620. The second end of the fifth resistor 642 is grounded. In one embodiment, the power source 601 may be a dry cell, a battery, or the like. The bias circuit 640 composed of the fourth resistor 641 and the fifth resistor 642 can generate a bias voltage and input the bias voltage to the amplifier 620, so that the subsequent processing of the amplifier 620 is facilitated.
In one embodiment, a digital filter network may be further disposed between the amplifying circuit 600 and the control circuit 400. Wherein the digital filter network may be a digital filter. The amplified detection signal output by the amplifying circuit 600 can be subjected to digital filtering processing through the digital filtering network, and a 50/60Hz sinusoidal signal can be obtained. Compared with analog filtering, the digital filtering method is easier to realize, and the anti-interference capability is improved.
Referring to fig. 6, in one embodiment, the control circuit 400 includes a bias generator 410 and a controller 420. The first end of the bias generator 410 is commonly connected to the output of the first capacitor plate 110 and the output of the third capacitor plate 130. The bias generator 410 is configured to output a bias voltage, and calibrate the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit 200 based on the bias voltage when no foreign object is detected. The first end of the controller 420 is electrically connected to the second end of the bias generator 410. A second terminal of the controller 420 is electrically connected to a third terminal of the logic gate 300. The controller 420 is configured to determine whether foreign objects exist in the building 101 according to the first voltage and a preset voltage threshold.
In one embodiment, when the building 101 corresponding to the building detection apparatus 10 does not hide foreign objects after the multi-frequency oscillating circuit 200 outputs the first square wave signal and the second square wave signal, the controller 420 may control the bias generator 410 to output a bias voltage. The bias generator 410 may adjust the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit 200 based on the bias voltage such that the first square wave signal and the second square wave signal are complementary. That is, calibration of the first square wave signal and the second square wave signal based on the bias voltage is achieved by the bias generator 410 such that the first square wave signal and the second square wave signal are fully complementary.
After calibration, the logic gate circuit 300 may convert the first square wave signal and the second square wave signal into a square wave signal and output the first voltage. I.e. the logic gate 300 outputs the first voltage to the controller 420 at this time. The controller 420 may compare the first voltage with the preset voltage threshold after receiving the first voltage. If the first voltage is greater than the preset voltage threshold, it is determined that a foreign object exists in the building 101 corresponding to the second capacitor plate 120. That is, the first capacitor plate 110, the second capacitor plate 120, and the third capacitor plate 130 move to the area with the foreign matter, at this time, the logic gate 300 outputs the first voltage to generate abrupt change, and the first voltage at the abrupt change is greater than the preset voltage threshold. Thus, it is determined that foreign matter exists in the area of the building 101 corresponding to the building detection device 10 at this time, and the accuracy of detection is improved.
In one embodiment, the building detection device 10 further includes a second resistor 111. The first end of the second resistor 111 is commonly connected to the output end of the first capacitor plate 110 and the output end of the third capacitor plate 130. The second end of the second resistor 111 is electrically connected to the first end of the multi-frequency oscillating circuit 200. In one embodiment, the second resistor 111 may be a resistor with a fixed resistance value.
In one embodiment, the building detection device 10 further includes a third resistor 121. The first end of the third resistor 121 is commonly connected to the output end of the second capacitor plate 120. The second end of the third resistor 121 is electrically connected to the second end of the multi-frequency oscillating circuit 200. In one embodiment, the third resistor 121 may be a resistor with a fixed resistance value. In one embodiment, the values of the second resistor 111 and the third resistor 121 may be adjusted so that the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit 200 are not completely complementary before being not calibrated. In this way, the control circuit 400 can calibrate the first square wave signal and the second square wave signal based on the bias voltage during operation, so as to improve the accuracy of detection.
In one embodiment, the building detection device 10 further includes an alarm 710. The alarm 710 is electrically connected to the fourth terminal of the control circuit 400. In one embodiment, the type of the alarm 710 is not limited, as long as it has an alarm function. In one embodiment, the alarm 710 may be a buzzer alarm. In one embodiment, the alarm 710 may also be an LED alarm. When the building body detection device 10 is in use, the alarm 710 may be used to alarm when the control circuit 400 determines that a foreign object exists in the area of the building body 101 corresponding to the building body detection device 10 according to the first voltage and the preset voltage threshold value, so as to prompt a worker that the foreign object exists in the area of the building body 101. Thus, by matching the alarm 710, the detection efficiency can be improved.
In one embodiment, the building detection device 10 further includes a filter circuit 720. A first terminal of the filter circuit 720 is electrically connected to a third terminal of the logic gate 300. A second terminal of the filter circuit 720 is electrically connected to a second terminal of the control circuit 400. In one embodiment, the specific structure of the filtering circuit 720 is not limited, and an RC filtering circuit may be used. The filtering circuit 720 filters the first voltage output from the logic gate 300, so as to improve the anti-interference capability of the first voltage.
In summary, the multi-frequency oscillating circuit 200 outputs the first square wave signal according to the detection signals of the first capacitor plate 110 and the third capacitor plate 130, and outputs the second square wave signal according to the detection signals of the second capacitor plate 120. The first square wave signal and the second square wave signal output from the multi-frequency oscillating circuit 200 are calibrated by the control circuit 400 when no foreign matter is detected. After calibration, the logic gate 300 outputs a first voltage according to the first square wave signal and the second square wave signal. The control circuit 400 determines whether foreign matters exist in the building body 101 according to the first voltage and a preset voltage threshold value, so as to accurately detect non-ferrous foreign matters such as plastic water pipe wood beams and the like existing in the building body 101.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (12)
1. The building detection device is characterized by comprising a first capacitor plate (110), a second capacitor plate (120), a third capacitor plate (130), a multi-frequency oscillating circuit (200), a logic gate circuit (300) and a control circuit (400);
The first capacitor plate (110), the second capacitor plate (120) and the third capacitor plate (130) are arranged at intervals along the horizontal direction, the output end of the first capacitor plate (110), the output end of the third capacitor plate (130), the first end of the control circuit (400) and the first end of the multi-frequency oscillating circuit (200) are connected together, the output end of the second capacitor plate (120) is electrically connected with the second end of the multi-frequency oscillating circuit (200), the first end of the logic gate circuit (300) is electrically connected with the third end of the multi-frequency oscillating circuit (200), the second end of the logic gate circuit (300) is electrically connected with the fourth end of the multi-frequency oscillating circuit (200), and the third end of the logic gate circuit (300) is electrically connected with the second end of the control circuit (400).
The multi-frequency oscillating circuit (200) is used for outputting a first square wave signal according to detection signals of the first capacitor plate (110) and the third capacitor plate (130), outputting a second square wave signal according to detection signals of the second capacitor plate (120), the control circuit (400) is used for calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit (200) when no foreign matter is detected, after calibration, the logic gate circuit (300) outputs a first voltage according to the first square wave signal and the second square wave signal, and the control circuit (400) is used for determining whether foreign matter exists in the building (101) according to the first voltage and a preset voltage threshold.
2. The building detection apparatus as claimed in claim 1, wherein the control circuit (400) is configured to compare the first voltage with the preset voltage threshold;
And if the first voltage is larger than the preset voltage threshold value, determining that foreign matters exist in the building (101) corresponding to the second capacitor plate (120).
3. The building detection apparatus according to claim 1, wherein the control circuit (400) is configured to calibrate the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit (200) is:
The control circuit (400) is used for outputting a bias voltage and adjusting the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit (200) based on the bias voltage so that the first square wave signal and the second square wave signal are complementary.
4. The building detection apparatus according to claim 1, wherein the control circuit (400) is further configured to acquire a plurality of the first voltages and calculate real-time variances of the plurality of the first voltages in a preset period, and determine the preset voltage threshold based on the real-time variances and a fixed offset.
5. The building detection apparatus according to claim 1, further comprising:
a detection antenna (500) for detecting a live conductor and outputting a detection signal;
an amplifying circuit (600) electrically connected to the third terminals of the detecting antenna (500) and the control circuit (400), respectively, for amplifying the detecting signal and outputting the amplified detecting signal to the control circuit (400);
The control circuit (400) determines whether a live conductor is present in the building (101) based on the amplified detection signal.
6. The building body detection apparatus according to claim 5, wherein the control circuit (400) calculates an amplitude from the amplified detection signal, compares the amplitude with a preset amplitude threshold, and determines that a belt conductor exists in the building body (101) corresponding to the current building body detection apparatus if the amplitude is greater than the preset amplitude threshold.
7. The building detection apparatus according to claim 5, wherein the amplifying circuit (600) includes:
-a capacitor (610), a first end of the capacitor (610) being electrically connected to the detection antenna (500);
-an amplifier (620), a first end of the amplifier (620) being electrically connected to a second end of the capacitor (610), a second end of the amplifier (620) being electrically connected to a third end of the control circuit (400);
a first resistor (630), a first end of the first resistor (630) being commonly connected to a first end of the amplifier (620) and a second end of the capacitor (610), a second end of the first resistor (630) being electrically connected to a second end of the amplifier (620), and
-A bias circuit (640), a first end of the bias circuit (640) being adapted to be electrically connected to a power supply (601), a second end of the bias circuit (640) being electrically connected to a third end of the amplifier (620), a third end of the bias circuit (640) being grounded.
8. The building detection apparatus as defined in any one of claims 1-7, wherein the control circuit (400) comprises:
A bias generator (410), a first end of the bias generator (410) is commonly connected with the output end of the first capacitor plate (110) and the output end of the third capacitor plate (130) and is used for outputting a bias voltage and calibrating the first square wave signal and the second square wave signal output by the multi-frequency oscillating circuit (200) based on the bias voltage when no foreign matter is detected, and
And a controller (420), wherein a first end of the controller (420) is electrically connected with a second end of the bias generator (410), a second end of the controller (420) is electrically connected with a third end of the logic gate circuit (300), and the controller (420) is used for determining whether foreign matters exist in the building (101) according to the first voltage and a preset voltage threshold value.
9. The building body detection apparatus according to any one of claims 1 to 7, further comprising:
And the first end of the second resistor (111) is commonly connected with the output end of the first capacitor plate (110) and the output end of the third capacitor plate (130), and the second end of the second resistor (111) is electrically connected with the first end of the multi-frequency oscillating circuit (200).
10. The building body detection apparatus according to any one of claims 1 to 7, further comprising:
And the first end of the third resistor (121) is commonly connected with the output end of the second capacitor plate (120), and the second end of the third resistor (121) is electrically connected with the second end of the multi-frequency oscillating circuit (200).
11. The building body detection apparatus according to any one of claims 1 to 7, further comprising:
and an alarm (710) electrically connected to the fourth terminal of the control circuit (400).
12. The building body detection apparatus according to any one of claims 1 to 7, further comprising:
-a filter circuit (720), a first end of the filter circuit (720) being electrically connected to the third end of the logic gate circuit (300), a second end of the filter circuit (720) being electrically connected to the second end of the control circuit (400).
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| US7495455B2 (en) * | 2002-06-28 | 2009-02-24 | Solar Wide Industrial Limited | Stud sensing device |
| US7504817B2 (en) * | 2007-03-28 | 2009-03-17 | Solar Wide Industrial Limited | Stud sensor |
| CA2746875A1 (en) * | 2011-07-19 | 2013-01-19 | Mariusz Thomas Zientarski | Downhole telemetry signalling apparatus |
| CN103197352B (en) * | 2013-03-12 | 2015-05-13 | 武汉大学 | Multifunctional wall body detecting instrument |
| US10203424B2 (en) * | 2014-07-17 | 2019-02-12 | Hangzhou Great Star Tools Co., Ltd. | Stud sensor |
| CN106708157B (en) * | 2016-12-29 | 2017-10-31 | 华中科技大学 | A kind of APD operating voltages automatic dialing unit and method |
| CN208569063U (en) * | 2018-07-30 | 2019-03-01 | 优利德科技(中国)股份有限公司 | A kind of wall measuring device |
| CN111399069A (en) * | 2020-03-20 | 2020-07-10 | 惠州市迈测科技有限公司 | Metal detection device |
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