CN206593749U - A kind of field calibration system for magnetoelectric sensor - Google Patents
A kind of field calibration system for magnetoelectric sensor Download PDFInfo
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- CN206593749U CN206593749U CN201720249815.2U CN201720249815U CN206593749U CN 206593749 U CN206593749 U CN 206593749U CN 201720249815 U CN201720249815 U CN 201720249815U CN 206593749 U CN206593749 U CN 206593749U
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Abstract
The utility model provides a kind of field calibration system for magnetoelectric sensor, including digital collection instrument, calibration circuit and signal processing apparatus；The digital collection instrument is provided with voltage signal output end, the first signal input part, secondary signal input；The calibration circuit is provided with pumping signal output end and calibration signal output end；The voltage signal output end of the digital collection instrument is used to be connected with the pumping signal output end of the driving calibration circuit, the pumping signal output end of the calibration circuit, for being connected with magnetoelectric sensor to be calibrated；The calibration circuit calibration signal output end is connected with the first signal input part of the digital collection instrument；The secondary signal input of the digital collection instrument is used to be connected with magnetoelectric sensor to be calibrated, and receives the vibration signal of magnetoelectric sensor；The signal processing apparatus is connected with the digital collection instrument, the two paths of signals for digital collection instrument described in reception processing.
Description
Technical Field
The utility model relates to a vibrometer calibration field, especially a magnetoelectric sensor calbiration system.
Background
In the field of earthquake detection and engineering vibration measurement, a large number of vibration measurement sensors are often needed to monitor the ground, engineering structures and mechanical equipment for a long time. For example, in the aspect of strong earthquake observation, the global data for earthquake motion observation exceeds 3 thousands, sensors arranged in structural health monitoring and environmental vibration monitoring are much higher than the number, and the sensors usually work for years, so that the field calibration technology has a great deal of practical requirements. The existing techniques available for calibration of magnetoelectric sensors have the following problems:
1. the high-frequency part has poor anti-jamming capability, cannot ensure the signal-to-noise ratio of a high frequency band no matter a step signal or a unit pulse signal is used, and is only suitable for long-period calibration;
2. when the traditional calibration is carried out by using a sinusoidal signal, although the input signal can be adjusted to ensure the signal-to-noise ratio of a high frequency band, the error of an actual test result in the high frequency band can reach 30 percent and cannot be used as a basis for judging whether a sensor is damaged;
3. white noise and pseudo-random binary signals are strong in anti-interference, but the frequency characteristics or transfer functions of the sensors need to be known to complete convolution operation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming and not enough, provide a magnetoelectric sensor calbiration system.
The utility model discloses a following scheme realizes: an on-site calibration system for a magnetoelectric sensor comprises a digital acquisition instrument, a calibration circuit and a signal processing device;
the digital acquisition instrument is provided with a voltage signal output end, a first signal input end and a second signal input end; the calibration circuit is provided with an excitation signal output end and a calibration signal output end;
the voltage signal output end of the digital acquisition instrument is used for being connected with the excitation signal output end of the driving calibration circuit, and the excitation signal output end of the calibration circuit is used for being connected with a magnetoelectric sensor to be calibrated; the calibration signal output end of the calibration circuit is connected with the first signal input end of the digital acquisition instrument;
the second signal input end of the digital acquisition instrument is used for being connected with a magnetoelectric sensor to be calibrated and receiving a vibration signal of the magnetoelectric sensor;
the signal processing device is connected with the digital acquisition instrument and used for receiving and processing the two paths of signals of the digital acquisition instrument.
As a further improvement of the present invention, the digital acquisition instrument includes a signal source for generating a voltage signal.
As a further improvement of the present invention, the calibration circuit includes a resistor, one end of the resistor is a ground terminal, and the resistor is grounded to the ground terminal of the signal source; the other end of the resistor is a non-grounded end and forms an excitation signal output port of the calibration circuit together with the positive end of the signal source; and the grounding end and the non-grounding end of the resistor jointly form a calibration signal output port and are connected with the digital acquisition instrument.
As a further improvement of the present invention, the signal processing apparatus includes:
the digital filtering module is used for filtering the two paths of signals of the digital acquisition instrument;
the peak value detection module is used for detecting the peak value of the signal;
and the sensitivity calculation module is used for calculating the sensitivity of the magnetoelectric sensor.
As a further improvement of the utility model, the resistor is a metal film resistor.
To sum up, through the utility model discloses a calibration system has realized following technological effect:
1. the calibration system has simple structure and convenient carrying, and can be used for on-line calibration of the sensor;
2. the utility model discloses successfully solved magnetoelectric sensor when using sinusoidal steady state method calibration, the problem that the high band precision is low has eliminated calibration error from the principle, has reduced the error from the actual operation.
For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a connection block diagram of the magnetoelectric sensor calibration system of the present invention.
Fig. 2 is a circuit diagram of the calibration circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Please refer to fig. 1, which is a connection block diagram of a calibration system of a magnetoelectric sensor according to the present invention.
The utility model provides a field calibration system for magnetoelectric sensor, including digital acquisition instrument 1, calibration circuit 2, signal processing apparatus 3 and treat magnetoelectric sensor 4 of calibration. The digital acquisition instrument 1 is respectively connected with the calibration circuit 2, the magnetoelectric sensor 4 and the signal processing device. The digital acquisition instrument 1 acquires signals of the calibration circuit 2 and the magnetoelectric sensor 4, sends the signals to the signal processing device 3 for processing, and finally calculates the electric sensitivity of the magnetoelectric sensor. The following detailed description describes the circuit connection schematic diagram of the electromagnetic sensor calibration system of the present invention.
The utility model adopts a digital acquisition instrument 1 which is provided with a voltage signal output end P1, a first signal input end CH1 and a second signal input end CH 2; the calibration circuit 2 is provided with a voltage signal input terminal P2, a stimulus signal output terminal P3, and a calibration signal output terminal P4. The signal processing device 3 is connected with the digital acquisition instrument through a USB interface. The magnetoelectric sensor 4 is provided with a calibration coil port P7 and a main coil port P8.
The digital acquisition instrument 1 is internally provided with a signal source for generating a voltage signal, and is connected with a voltage signal input end P2 of the driving calibration circuit 2 through the voltage signal output end P1, and an excitation signal output end P3 of the calibration circuit is connected with a calibration coil end P7 of the magnetoelectric sensor 4. The calibration circuit calibration signal output terminal P4 is connected to the first signal input terminal CH1 of the digital acquisition instrument 1. And a second signal input end CH2 of the digital acquisition instrument is connected with a main coil end P8 of the magnetoelectric sensor 4 and receives a vibration signal of the magnetoelectric sensor.
The signal processing device 3 is connected with the digital acquisition instrument 1 through a USB interface and is used for receiving and processing signals of CH1 and CH2 of the digital acquisition instrument. The signal processing device 3 may be a terminal device installed with signal processing software, such as: computers, etc.
Specifically, the signal processing apparatus includes the following functional modules: the device comprises a digital filtering module, a peak value detection module and a sensitivity calculation module.
And the digital filtering module is used for filtering the two paths of signals of the digital acquisition instrument. Specifically, the utility model discloses a frequency of software filtering generally selects the twice of sensor upper limit frequency.
And the peak value detection module is used for detecting the peak value of the signal.
And the sensitivity calculation module is used for calculating the sensitivity of the magnetoelectric sensor.
The utility model discloses in specifically frequency and the amplitude through software adjustment signal generator for measure the sensor sensitivity under the different frequencies.
Please refer to fig. 2, which is a circuit diagram of the calibration circuit of the present invention. Further specifically introduce the utility model discloses a concrete constitution of calibration circuit that adopts. The utility model discloses a calibration circuit only includes a resistance, and the one end of this resistance is the earthing terminal, with the earthing terminal of signal source is earthed together. The other end of the resistor is a non-grounded end and forms an excitation signal output port of the calibration circuit together with the positive end of the signal source. And the grounding end and the non-grounding end of the resistor jointly form a calibration signal output port and are connected with the digital acquisition instrument.
The resistor of the calibration circuit is a resistor with a small temperature coefficient, such as a metal film resistor.
By the calibration system, the voltage output signal of the calibration circuit and the voltage output signal of the sensor are transmitted to the processing software in the computer, so that the electric sensitivity of the sensor under the selected frequency is calculated, the amplitude-frequency characteristic response curve of the sensor is obtained, the sensor can be calibrated without being detached, and the problem of large error of a high-frequency calibration result in the field calibration technology of the magnetoelectric sensor is solved.
The principles and advantages of the present invention are further described below in conjunction with the following formula derivation.
First, the transfer function of a typical passive magnetoelectric vibration sensor is:
wherein,
the meaning of the parameters in the formulae (1) and (2) is as follows:
y-displacement of the movable part of the vibration table;
e-sensor voltage output signal;
g is the product of electromechanical coupling coefficient of the main coil of the sensor, magnetic field intensity and length of the enameled wire winding;
m-mass of movable part of sensor;
r is the input internal resistance of the sensor acquisition equipment;
Rs-internal resistance of coil
C-sensor feedback capacitance;
k-elastic element stiffness;
c-air damping coefficient;
s — laplacian.
Order:
then, equation (1) can be simplified as:
however, in a general calibration method, a voltage signal is directly supplied to a calibration coil, and thus the ratio of current flowing through the coil to the voltage signal changes with frequency due to the influence of the inductance of the coil. The following is a transfer function expression for constant pressure calibration of the sensor:
wherein:
W4＝m[R2+L2s](6)
u is the voltage at the output of the signal source, where R2To calibrate the internal resistance of the coil, G2To calibrate the electromechanical coupling coefficient of the coil, L2In order to calibrate the coil inductance, the ratio is not a constant in the formula (6) compared with the formula (4), and thus such a method has an error in theory.
The utility model discloses a measure the voltage value at the resistance both ends that one and calibration coil establish ties in the calibration circuit (refer to figure 2), obtain and be directly proportional with calibration coil electric current, can react the voltage signal of calibration coil actual acceleration to make the calibration result accuracy of sensor improve greatly. The transfer function of the calibration system is:
wherein R iscTo calibrate the internal resistance of the circuit. Formula (7) compares with formula (4) and only differs by a constant coefficient, consequently the utility model discloses calibration error has been stopped from the theory.
To sum up, through the utility model discloses a calibration system has realized following technological effect:
1. the calibration system has simple structure and convenient carrying, and can be used for on-line calibration of the sensor;
2. the utility model discloses successfully solved magnetoelectric sensor when using sinusoidal steady state method calibration, the problem that the high band precision is low has eliminated calibration error from the principle, has reduced the error from the actual operation.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (5)
1. An in-situ calibration system for a magnetoelectric sensor, characterized by: the device comprises a digital acquisition instrument, a calibration circuit and a signal processing device;
the digital acquisition instrument is provided with a voltage signal output end, a first signal input end and a second signal input end; the calibration circuit is provided with a voltage signal input end, an excitation signal output end and a calibration signal output end;
the voltage signal output end of the digital acquisition instrument is used for being connected with the voltage signal input end of the calibration circuit, and the excitation signal output end of the calibration circuit is used for being connected with a magnetoelectric sensor to be calibrated; the calibration signal output end of the calibration circuit is connected with the first signal input end of the digital acquisition instrument;
the second signal input end of the digital acquisition instrument is used for being connected with a magnetoelectric sensor to be calibrated and receiving a vibration signal of the magnetoelectric sensor;
the signal processing device is connected with the digital acquisition instrument and used for receiving and processing the two paths of signals of the digital acquisition instrument.
2. The in-situ calibration system for a magnetoelectric sensor according to claim 1, wherein: the digital acquisition instrument comprises a signal source for generating a voltage signal.
3. The in-situ calibration system for a magnetoelectric sensor according to claim 2, wherein: the calibration circuit comprises a resistor, one end of the resistor is a grounding end, and the resistor is grounded with the grounding end of the signal source; the other end of the resistor is a non-grounded end and forms an excitation signal output port of the calibration circuit together with the positive end of the signal source; and the grounding end and the non-grounding end of the resistor jointly form a calibration signal output port and are connected with the digital acquisition instrument.
4. The in-situ calibration system for a magnetoelectric sensor according to claim 1, wherein: the signal processing device comprises
The digital filtering module is used for filtering the two paths of signals of the digital acquisition instrument;
the peak value detection module is used for detecting the peak value of the signal;
and the sensitivity calculation module is used for calculating the sensitivity of the magnetoelectric sensor.
5. The in-situ calibration system for a magnetoelectric sensor according to claim 3, wherein: the resistor is a metal film resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720249815.2U CN206593749U (en) | 2017-03-14 | 2017-03-14 | A kind of field calibration system for magnetoelectric sensor |
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| CN201720249815.2U CN206593749U (en) | 2017-03-14 | 2017-03-14 | A kind of field calibration system for magnetoelectric sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768282A (en) * | 2017-03-14 | 2017-05-31 | 匙庆磊 | A kind of field calibration system for magnetoelectric sensor |
| CN108957146A (en) * | 2018-08-02 | 2018-12-07 | 卢小丽 | Impulse electric field detector and application method with sensitivity coefficient self-calibration function |
-
2017
- 2017-03-14 CN CN201720249815.2U patent/CN206593749U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768282A (en) * | 2017-03-14 | 2017-05-31 | 匙庆磊 | A kind of field calibration system for magnetoelectric sensor |
| CN108957146A (en) * | 2018-08-02 | 2018-12-07 | 卢小丽 | Impulse electric field detector and application method with sensitivity coefficient self-calibration function |
| CN108957146B (en) * | 2018-08-02 | 2021-06-08 | 卢小丽 | Pulse electric field detector with sensitivity coefficient self-calibration function and use method |
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