CN106092252A - A kind of experiment high-precision digital automatic water level tests system - Google Patents

Abstract

The invention discloses a high-precision digital automatic water level testing system for experiments, comprising: a power supply; a conductive probe connected to the power supply; a driving mechanism used to drive the conductive probe to move up and down according to a driving instruction; a grounding module used to make the to-be The grounding of the solution is measured; the displacement sensor is used to collect the position information of the conductive probe; the control module is connected to the driving mechanism and the displacement sensor respectively, and the control module is used to send a driving command to the driving mechanism. Obtain the first position information of the conductive probe when a path is formed between the needle, the solution to be tested and the grounding module, and the control module is also used to obtain the second position information of the conductive probe when the conductive probe touches the bottom surface of the solution to be tested, and control The module is also used to obtain the depth information of the solution to be tested according to the first position information and the second position information of the conductive probe. The invention has the following advantages: the measurement result has high precision and does not need to be converted.

Description

A high-precision digital automatic water level test system for experiments

technical field

The invention relates to the interdisciplinary field of public safety and hydraulics, in particular to an experimental high-precision digital automatic water level testing system.

Background technique

Accurate measurement of water depth is required in many scientific experiments (especially in fields such as hydraulics). Various water depth sensors currently available sometimes cannot meet the experimental requirements. Ultrasonic liquid level detectors have limited precision. Generally, they can only reach the centimeter level, and a few can reach the millimeter level, which cannot meet the requirements of precise experiments. The laser ranging detector itself has high precision, but due to the high transparency of water, the effect is not good when used for bathymetry. The pressure sensor is greatly affected by the ambient temperature and air pressure, so the accuracy is limited, and the use of some occasions that do not meet the static pressure distribution will lead to measurement errors (for example, raindrops in the rainfall experiment will cause additional impact pressure, resulting in the pressure sensor The measured value reversed the water depth is too large). Resistive and capacitive water depth sensors require contact measurements, which may affect the flow field in experiments involving water flow, and additional errors may occur due to contact angle hysteresis. In addition, most water depth sensors currently output analog signals, which require analog-to-digital conversion to connect to a computer for automatic data collection and processing, and secondary errors will inevitably occur during the analog-to-digital conversion process. Moreover, analog signals are susceptible to interference during long-distance transmission, resulting in data errors.

Contents of the invention

The present invention aims to solve at least one of the above-mentioned technical problems.

Therefore, an object of the present invention is to propose an experimental high-precision digital automatic water level testing system with high measurement accuracy and without conversion.

In order to achieve the above object, an embodiment of the present invention discloses a high-precision digital automatic water level testing system for experiments, including: a power supply; a conductive probe, the conductive probe is connected to the power supply; a driving mechanism, the driving mechanism It is used to drive the conductive probe to move up and down according to the driving instruction; the grounding module is used to ground the solution to be tested; the displacement sensor is used to collect the position information of the conductive probe; the control module , respectively connected to the driving mechanism and the displacement sensor, the control module is used to send the driving instruction to the driving mechanism, and the control module is also used to connect the power supply, the conductive probe, the The first position information of the conductive probe is obtained when a path is formed between the solution to be tested and the grounding module, and the control module is also used to obtain the first position information of the conductive probe when the conductive probe touches the bottom surface of the solution to be tested. The second position information of the conductive probe, the control module is further configured to obtain the depth information of the solution to be tested according to the first position information and the second position information of the conductive probe.

According to the experimental high-precision digital automatic water level testing system according to the embodiment of the present invention, when the conductive probe touches the water surface of the solution to be tested to conduct electricity, the first position of the conductive probe is obtained; when the conductive probe touches the bottom surface of the solution to be tested, and The probe does not move in the vertical direction to obtain the second position of the conductive probe, and the depth of the solution to be tested is obtained according to the first position and the second position, and the measurement result has high precision and does not need to be converted.

In addition, the experimental high-precision digital automatic water level testing system according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

Further, it also includes: a probe mounting part; a mounting frame; wherein, the conductive probe is arranged on the probe mounting part, the displacement sensor is an electronic digital scale, and one end of the scale of the electronic digital scale is fixedly arranged on the mounting frame, the digital display unit of the electronic digital display scale is arranged on the probe mounting part; the driving mechanism includes a driving mechanism and a driving unit, and the driving mechanism and the probe are installed The components are connected by connecting ropes, and the driving unit is used to drive the driving mechanism to move up and down.

Further, the installation frame is provided with a vertical guide rail, the driving mechanism is a slider, and the slider slides on the vertical guide rail.

Further, it also includes: springs, the springs are respectively connected with the mounting frame and the probe installation part, and the springs are used to send the probe to the probe when the conductive probe is at the bottom of the solution to be tested. The needle mounting part adds a force toward the bottom of the solution to be tested to ensure that the conductive probe is relatively fixed to the bottom of the solution to be tested.

Further, at least one pulley is also included, the spring is an extension spring, one end of the extension spring is fixedly connected to the installation frame, and the other end of the extension spring is connected to the probe through the at least one pulley. The needle installation part is connected, and the at least one pulley is used to change the force direction.

Further, the spring is a compression spring, one end of the compression spring is fixedly connected to the installation frame, and the other end of the compression spring is fixedly connected to the probe mounting part.

Further, the power supply is a negative power supply.

Further, the conductive probe is a stainless steel probe.

Further, the conductive probe includes a probe main body and a needle head, the probe main body is a cylinder, the diameter of the bottom surface of the cylinder is greater than or equal to three millimeters and less than or equal to five millimeters, and the needle head is arranged on the probe below the subject.

Further, the mounting frame is an aluminum alloy mounting frame.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the structural block diagram of the high-precision digitized automatic water level testing system of the experiment of an embodiment of the present invention;

Fig. 2 is the structural representation of part structure in the experimental high-precision digital automatic water level testing system of an embodiment of the present invention;

Fig. 3 is a comparison diagram of the precision digital automatic water level measuring needle of the embodiment of the present invention and the measurement result of accurately obtaining the actual water depth in the container by the method of weighing with a precision electronic balance.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

These and other aspects of embodiments of the invention will become apparent with reference to the following description and drawings. In these descriptions and drawings, some specific implementations of the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the scope of the embodiments of the present invention is not limited by this limit. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents coming within the spirit and scope of the appended claims.

The following describes an experimental high-precision digital automatic water level testing system according to an embodiment of the present invention with reference to the accompanying drawings.

Fig. 1 is a structural block diagram of an experimental high-precision digital automatic water level testing system according to an embodiment of the present invention.

As shown in FIG. 1 , an experimental high-precision digital automatic water level testing system includes: a power supply 110 , a conductive probe 120 , a driving mechanism 130 , a grounding module 140 , a displacement sensor 150 and a control module 160 .

Wherein, the conductive probe 120 is connected to the power source 110 . The driving mechanism 130 is used to drive the conductive probe 120 to move up and down according to the driving instruction. The grounding module 140 is used to ground the solution to be tested. The displacement sensor 150 is used for collecting position information of the conductive probe 120 . The control module 160 is respectively connected with the driving mechanism 130 and the displacement sensor 150 for sending a driving command to the driving mechanism 130 . The control module 160 is also used for obtaining the first position information of the conductive probe 120 when a path is formed between the power source 110, the conductive probe 120, the solution to be tested and the grounding module 140, and when the conductive probe 120 contacts the bottom surface of the solution to be tested At this time, the second position information of the conductive probe 120 is obtained, and the depth information of the solution to be tested is obtained according to the first position information and the second position information of the conductive probe 120 .

Specifically, during the experiment, the conductive probe 120 is arranged perpendicular to the water surface of the solution to be tested. Turn on the power supply 110, and connect the grounding module with the solution to be tested. The control module 160 sends a driving instruction to the driving mechanism 130, and the driving mechanism 130 controls the conductive probe 120 to move vertically downward according to the driving instruction. When the conductive probe 120 contacts the water surface of the solution to be tested, it is connected between the power supply 110, the conductive probe 120, the solution to be tested and the grounding module 140. At this time, when the control module 160 detects that the above modules are connected, the control drive mechanism 130 is suspended. The conductive probe 120 is driven to continue to move downward, and the position of the conductive probe 120 is kept fixed for a first preset time. When the conductive probe 120 touches the water surface of the solution to be tested, the water surface will fluctuate, and the pause for the first preset time is to accurately measure the first position information of the conductive probe 120 . Specifically, within the first preset time, the sensor continuously obtains the position information of the conductive probe 120 and averages it to obtain the first position information of the conductive probe 120 . Since the distance between the lower end of the conductive probe 120 and the measured position is fixed, the first position information may reflect the water surface height position information of the solution to be measured. In an example of the present invention, the first preset time is 0.5 second-1 second. After the control mechanism 160 collects and records the first position information, continue to control the drive mechanism 130 to continue to drive the conductive probe 120 and continue to move downward until the conductive probe 120 no longer moves in the vertical direction (that is, the lower end of the conductive probe 120 contact with the bottom surface of the solution to be tested). Then wait for the second preset time. When the conductive probe 120 moves in the solution to be tested, it will cause fluctuations. The reason for pausing for the second preset time is to accurately measure the second position information of the conductive probe 120. The second position information can reflect the position information of the bottom height of the solution to be tested. Specifically, within the second preset time, the sensor continuously obtains the position information of the conductive probe 120 and averages it to obtain the second position information of the conductive probe 120 . Then, according to the first position information and the second position information of the conductive probe 120, the displacement of the conductive probe 120 in the solution to be tested is obtained, and then the depth information of the solution to be tested is obtained. The second preset time is 0.5 second-1 second.

Fig. 2 is a structural schematic diagram of part of the experimental high-precision digital automatic water level testing system according to an embodiment of the present invention. As shown in FIG. 2 , in one embodiment of the present invention, the experimental high-precision digital automatic water level testing system further includes a probe installation part 131 . The probe mounting part 131 is provided with a position signal sending module. The displacement sensor 150 is an electronic digital scale. One end of the scale (not shown in the figure) of the electronic digital display scale is fixedly arranged on the installation frame 133 , and the digital display unit of the electronic digital display scale is arranged on the probe mounting part 131 . The conductive probe 120 is disposed on the probe mounting part 131 . The driving mechanism 130 includes a driving mechanism and a driving unit, the driving mechanism and the probe mounting part 131 are connected by a connecting rope 132, and the driving unit is used to drive the driving mechanism to move up and down. When the lower end of the conductive probe 120 touches the bottom surface of the solution to be tested, the probe mounting part 131 will not continue to move, but the drive mechanism will continue to move downward in a small range under the drive of the drive unit. Due to the existence of the connecting rope 132, it can be avoided. Damage to the conductive probe 120 .

In one embodiment of the present invention, the experimental high-precision digital automatic water level testing system further includes a mounting frame 133 on which a vertical guide rail 134 is arranged. The driving mechanism is a slider 135, and the slider 135 slides on the vertical guide rail 134, which can ensure that the probe mounting part 131 connected with the slider 134 through the connecting rope 132 moves in the vertical direction, and improves the accuracy in the driving direction.

In one embodiment of the present invention, the experimental high-precision digital automatic water level testing system further includes a spring. The springs are respectively connected to the mounting frame 133 and the probe mounting part 131 . The spring is used to add a force to the probe mounting part 131 toward the bottom of the solution to be tested when the conductive probe 120 is at the bottom of the solution to be tested to ensure that the position of the bottom surface of the conductive probe 120 and the solution to be tested is relatively fixed, thereby ensuring The conductive probe 120 measures the accuracy of the position of the conductive probe 120 on the bottom surface of the solution to be tested for a second preset time.

In one embodiment of the present invention, the experimental high-precision digital automatic water level testing system further includes at least one pulley. The spring is a tension spring 170 . One end of the tension spring 170 is fixedly connected to the installation frame 133 , and the other end is connected to the probe mounting part 131 through at least one pulley, and at least one pulley is used to change the force direction. In an example of the present invention, the first pulley 181 and the second pulley 182 are used to change the force direction, so that after the conductive probe 120 touches the bottom surface of the solution to be tested, there is no probe mounting part 131 that is not driven by the drive unit When the force is applied, the positions of the conductive probe 120 and the bottom surface of the solution to be measured are relatively fixed, thereby improving the position acquisition accuracy.

In one embodiment of the invention, the spring is a compression spring. One end of the compression spring is fixedly connected to the mounting frame 133, and the other end is fixedly connected to the probe mounting part 131, so that after the conductive probe 120 touches the bottom surface of the solution to be tested, when the probe mounting part 131 is not driven by the drive unit To ensure that the positions of the conductive probe 120 and the bottom surface of the solution to be tested are relatively fixed, thereby improving the accuracy of position acquisition.

In one embodiment of the present invention, the power supply 110 is a negative power supply, so that the potential of the conductive probe 120 is lower than that of the solution to be tested, thereby preventing the conductive probe 120 from being electrolytically corroded.

In one embodiment of the present invention, the conductive probe 120 is a stainless steel probe to prevent the conductive probe 120 from being corroded. In an example of the present invention, the conductive probe 120 is made of 304 stainless steel or 316 stainless steel.

In one embodiment of the present invention, conductive probe 120 includes a probe body and a needle. The needle is disposed below the probe body. The main body of the probe is a cylinder, and the diameter of the bottom surface of the cylinder is greater than or equal to 3mm and less than or equal to 5mm. If the diameter of the cylinder is too thin and the hardness is not enough, it may bend when measuring the bottom surface, resulting in a low measurement value of the bottom surface and a large measurement value of water depth; Thickness will lead to an increase in cost, and when measuring flowing water, the resistance caused by the thick probe will be large, and it will take a long time for the water flow to stabilize after the measurement is completed. .

In one embodiment of the present invention, the mounting frame 133 is an aluminum alloy mounting frame to ensure strength while reducing weight.

Fig. 3 is a comparison diagram of the precision digital automatic water level measuring needle of the embodiment of the present invention and the measurement result of accurately obtaining the actual water depth in the container by the method of weighing with a precision electronic balance. It can be seen from Figure 3 that the mean square error (RMSE) is only 0.06mm.

In addition, other configurations and functions of the experimental high-precision digital automatic water level testing system of the embodiment of the present invention are known to those skilled in the art, and will not be repeated in order to reduce redundancy.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (10)

1. A high-precision digital automatic water level testing system for experiments, is characterized in that, comprising: power supply; a conductive probe connected to the power supply; a driving mechanism, the driving mechanism is used to drive the conductive probe to move up and down according to a driving instruction; A grounding module, the grounding module is used to ground the solution to be tested; a displacement sensor, the displacement sensor is used to collect the position information of the conductive probe; A control module, connected to the driving mechanism and the displacement sensor respectively, the control module is used to send the driving instruction to the driving mechanism, and the control module is also used to connect the power supply, the conductive probe 1. Obtaining the first position information of the conductive probe when a path is formed between the solution to be tested and the grounding module, and the control module is also used to obtain the first position information of the conductive probe when the conductive probe touches the bottom surface of the solution to be tested The second position information of the conductive probe is acquired, and the control module is further configured to obtain the depth information of the solution to be tested according to the first position information and the second position information of the conductive probe. 2. experiment according to claim 1 is characterized in that, also comprises: Probe mounting parts; Mount; Wherein, the conductive probe is arranged on the probe mounting part, the displacement sensor is an electronic digital display scale, and one end of the scale of the electronic digital display scale is fixedly arranged on the mounting frame, and the electronic digital display The digital display unit of the scale is arranged on the probe mounting part; the driving mechanism includes a driving mechanism and a driving unit, the driving mechanism and the probe mounting part are connected by a connecting rope, and the driving unit is used to drive the The drive mechanism moves up and down. 3. The experimental high-precision digital automatic water level testing system according to claim 2, characterized in that, the mounting frame is provided with a vertical guide rail, the driving mechanism is a slide block, and the slide block is positioned on the vertical rail. Glides on straight rails. 4. experiment according to claim 3 is characterized in that, also comprises: Springs, the springs are respectively connected to the mounting frame and the probe mounting part, and the springs are used to add the probe mounting part to the probe mounting part when the conductive probe is at the bottom of the solution to be tested. The force in the direction of the bottom of the solution to be tested is used to ensure that the positions of the conductive probe and the bottom of the solution to be tested are relatively fixed. 5. experiment according to claim 4 is characterized in that, also comprises at least one pulley with high-precision digitization automatic water level test system, and described spring is extension spring, and one end of described extension spring is fixed with described mounting bracket connected, the other end of the tension spring is connected to the probe mounting part through the at least one pulley, and the at least one pulley is used to change the force direction. 6. The experimental high-precision digital automatic water level testing system according to claim 4, wherein the spring is a compression spring, one end of the compression spring is fixedly connected with the mounting frame, and the other end of the compression spring is One end is fixedly connected with the probe mounting part. 7. The experimental high-precision digital automatic water level testing system according to any one of claims 1-6, wherein the power supply is a negative power supply. 8. The experimental high-precision digital automatic water level testing system according to any one of claims 1-6, wherein the conductive probe is a stainless steel probe. 9. according to the described experimental high-precision digital automatic water level testing system according to any one of claim 1-6, it is characterized in that, described conductive probe comprises probe main body and needle head, and described probe main body is a cylinder, so The diameter of the bottom surface of the cylinder is greater than or equal to three millimeters and less than or equal to five millimeters, and the needle is arranged below the probe body. 10. The experimental high-precision digital automatic water level testing system according to any one of claims 3-6, wherein the mounting frame is an aluminum alloy mounting frame.