CN112525953A - Liquid sensor, device for detecting breakage of liquid sensor, and method for detecting breakage of liquid sensor - Google Patents

Abstract

Embodiments of the present invention relate to a sensor, in particular to a liquid sensor, a damage detection device for the liquid sensor, and a damage detection method. The damage detection device includes: an internal electrode, an external electrode, and a measurement circuit; the internal electrode is arranged on a casing of the liquid sensor Inside, the inner electrode and the outer electrode are all electrically connected with the measurement circuit, and the measurement circuit is communicated with the remote equipment; the outer electrode and the inner electrode are isolated and disconnected by the casing, and the inner electrode and the outer electrode are both electrically connected with the measurement circuit; the measurement circuit is used for Real-time detection of the resistance value and partial pressure value between the external electrode and the internal electrode, the measurement circuit is also used to judge whether the casing is damaged according to the detected resistance value and partial pressure value changes, and after judging that the casing is damaged, send a message to the remote device. electric signal. Compared with the prior art, the uninterrupted real-time monitoring of whether the casing of the liquid sensor is damaged can be realized, and the phenomenon of misjudgment and missed judgment can be effectively prevented.

Description

Liquid sensor, damage detection device for liquid sensor, and damage detection method

technical field

Embodiments of the present invention relate to a sensor, and in particular, to a liquid sensor, a damage detection device for the liquid sensor, and a damage detection method.

Background technique

A liquid sensor is an electronic sensor that can measure the physical or chemical properties of liquids. It can convert the physical or chemical properties of liquids into electrical signals and measure them through electronic devices, such as dissolved oxygen in water, pH, etc. Liquid sensors are often used to measure the electrochemical characteristics of water bodies, such as dissolved oxygen content in water bodies, ammonia nitrogen ion content, etc., and are widely used in environmental protection, aquaculture, sewage treatment and other fields. Because liquid sensors are often used in important production and living environments, their reliability is very important. However, such sensors are often deployed in unattended environments and often require long-term stable operation. Due to the complex use environment, the sensor shell is often damaged. When the casing of the liquid sensor is damaged, its measurement results will deviate significantly from the normal value. If such faults cannot be detected, such erroneous data may lead to serious production accidents.

At present, the shell of the liquid sensor is composed of a metal or plastic shell and a semi-permeable membrane. The function of the shell is to protect the internal components of the sensor from direct contact with the liquid to be measured, so as to avoid the interference of physical and chemical factors unrelated to the measurement target, and to improve the stability and accuracy of the measurement. The semi-permeable membrane is to allow the target substance to enter the inside of the sensor housing. Its characteristic is to allow only substances equivalent to the target molecule to be measured to enter, and to isolate the target liquid from directly entering the sensor housing. In order to maintain the accuracy and stability of the measurement results for this type of liquid sensor, the key is to prevent the liquid to be measured from directly entering the sensor housing. Both the body and the semi-permeable membrane may be damaged. After the damage, the liquid to be measured will enter the inside of the sensor, and the impurities brought in will seriously affect the validity of the measurement.

The existing solutions generally have the following two types. The first one is to continuously track the measurement data of the sensor and perform signal processing on the measurement data. After the liquid to be measured infiltrates, the measurement data will sometimes have a certain range of fluctuations and noise. , Through digital signal processing, the noise in the measurement data is extracted. When the noise exceeds a certain threshold, it can be considered that the sensor is damaged. Although this method does not require additional hardware mechanisms, it requires a control unit with strong computing power, which has the advantage of lower hardware costs. However, the phenomenon caused by the measured liquid entering the sensor is uncertain. For example, the waveforms displayed by the liquid infiltrating the sensor under different water quality environments are different. Sometimes, the waveforms measured by the normal sensor are completely indistinguishable. The main disadvantage of the scheme is that the reliability of detection is not good, and it is prone to misjudgment and missed judgment.

The second is that the sensor will be calibrated and calibrated after production is completed to determine the measurement results of the sensor in a standard environment. For example, a dissolved oxygen sensor will measure the readings and response speed in a zero oxygen environment and a saturated oxygen environment. Another way to judge whether the sensor is damaged is to put the sensor in a standard test environment and calibrate the sensor parameters again. If the measurement reading of the sensor in the standard environment deviates significantly from the initial value calibrated at the factory, it can be considered that the sensor Damage has occurred. However, this method is commonly used in production, but requires a lot of manual operations, and cannot detect faults in real time. The test conditions are relatively high, and professional test equipment is often required, which makes the implementation cost of this solution too high, so that it is difficult to popularize in the general production field.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a liquid sensor, a damage detection device and a damage detection method for the liquid sensor, which can continuously monitor whether the casing of the liquid sensor is damaged in real time, and can effectively prevent misjudgments and missed judgments.

In order to solve the above-mentioned technical problems, an embodiment of the present invention provides a damage detection device for a liquid sensor, including:

The internal electrode is arranged in the casing of the liquid sensor;

The external electrode is arranged outside the casing of the liquid sensor;

The measuring circuit is arranged in the casing of the liquid sensor and communicates with the remote equipment;

Wherein, the outer electrode and the inner electrode are isolated and disconnected by the casing, and both the inner electrode and the outer electrode are electrically connected to the measurement circuit;

The measurement circuit is used for real-time detection of the resistance value and the voltage division value between the external electrode and the inner electrode, and the measurement circuit is also used for determining the resistance value and the voltage division value according to the detected change of the resistance value and the voltage division value. whether the casing is damaged, and after determining that the casing is damaged, send an electrical signal to the remote device.

In addition, an embodiment of the present invention also provides a liquid sensor, including:

The casing includes: a casing and a permeation device, the casing has a first cavity along a preset axis direction and a second cavity spaced apart from the first cavity, and the casing is further provided with openings on the casing an opening communicating with the first cavity; the permeation device is disposed on the casing and closes the opening; the permeation device is used for the target substance in the liquid to be detected to enter the first cavity;

a measurement electrode, disposed in the first cavity, electrically connected to the measurement circuit, and electrically connected to the target substance entering the first cavity;

In the above-mentioned damage detection device, the internal electrode is arranged in the first cavity, and the measurement circuit is arranged in the second cavity.

In addition, an embodiment of the present invention also provides a liquid sensor, including:

The casing includes: a casing and a permeation device, the casing has a first cavity along a preset axis direction and a second cavity spaced apart from the first cavity, and the casing is further provided with openings on the casing an opening communicating with the first cavity; the permeation device is disposed on the casing and closes the opening; the permeation device is used for the target substance in the liquid to be detected to enter the first cavity;

The damage detection device according to claim 1, wherein the inner electrode is arranged in the first cavity, the measurement circuit is arranged in the second cavity, and the inner electrode is also used for entering and entering the first cavity. The target substance in the cavity is electrically conductive.

In addition, an embodiment of the present invention also provides a method for detecting damage to a liquid sensor, including the following steps:

Detecting the resistance value and the partial pressure value between the inner electrode arranged in the casing of the liquid sensor and the outer electrode arranged outside the casing of the liquid sensor; the outer electrode and the inner electrode are isolated and disconnected by the casing;

According to the detected changes of the resistance value and the partial pressure value, determine whether the casing is damaged;

If it is determined that the casing is damaged, an electrical signal is sent to the remote device.

Compared with the prior art, the embodiment of the present invention is provided with an internal electrode and a measuring circuit inside the casing of the sensor, while an external electrode is disposed on the outside of the casing. The measurement circuit is also connected to the remote device in communication, so in practical application, with the help of the conductive properties of the liquid to be measured, the resistance value and the partial pressure value between the inner electrode and the outer electrode can be detected by the measurement circuit in real time, and according to the detected resistance value The value and partial pressure value change to judge whether the shell of the liquid sensor is damaged, that is, when the shell of the liquid sensor is damaged, the internal electrode and the external electrode can be electrically connected with the liquid to be tested, so that the resistance value detected by the detection circuit can be It is close to the resistance value of the liquid to be measured, that is, the loop impedance at this time is reduced, and the detected partial pressure value will also decrease. Therefore, the detection circuit can easily monitor whether the casing of the liquid sensor is damaged in real time, and can Effectively prevent misjudgments and missed judgments.

In addition, the internal electrode is disposed on one side of the top plate relative to the bottom plate; or,

The inner electrode is disposed on the inner side of the side plate.

Alternatively, the internal electrode is arranged perpendicular to the separator, one end of the internal electrode is connected to the separator, and the other end of the internal electrode is in contact with the infiltration device.

In addition, the inner electrode is disposed on the inner side of the side plate and adjacent to the top plate.

In addition, the external electrode is embedded in the side plate;

Alternatively, the external electrodes are disposed outside the side plates.

In addition, a wiring channel for electrically connecting the external electrode and the measurement circuit is also formed in the side plate.

In addition, the measuring electrode is arranged perpendicular to the separator, one end of the measuring electrode is connected to the separator, and the other end of the measuring electrode is abutted against the permeation device.

In addition, the permeation device is a semi-permeable membrane.

In the step of judging whether the casing is damaged according to the detected changes in the resistance value and the partial pressure value, it specifically includes:

Compare the detected resistance value and voltage divider value with the preset resistance threshold value range and voltage divider threshold value range in real time respectively;

If the detected resistance value and voltage divider value are within the resistance threshold value range and the voltage divider threshold value range respectively, it is determined that the casing is damaged;

If the detected resistance value and the voltage dividing value are outside the resistance threshold value range and the voltage dividing threshold value range, respectively, it is determined that the casing is not damaged.

Description of drawings

1 is a schematic structural diagram of a damage detection device for a liquid sensor according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a circuit module according to the first embodiment of the present invention;

3 is a schematic structural diagram of a liquid sensor according to a second embodiment of the present invention;

4 is a block diagram of a circuit module of a liquid sensor according to a second embodiment of the present invention;

5 is a schematic structural diagram of a liquid sensor according to a third embodiment of the present invention;

6 is a block diagram of a circuit module of a liquid sensor according to a third embodiment of the present invention;

FIG. 7 is a schematic flowchart of a damage detection method for a liquid sensor according to a fourth embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth in order for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the claims of the present application can be realized.

The first embodiment of the present invention relates to a damage detection device for a liquid sensor, as shown in FIG. 1 , including: an inner electrode 1 , an outer electrode 2 and a measurement circuit 3 .

Wherein, in this embodiment, as shown in FIG. 1 , the inner electrode 1 is arranged inside the casing 4 of the liquid sensor, and the outer electrode 2 and the measuring circuit 3 are arranged outside the casing 4 of the liquid sensor. Meanwhile, as shown in FIG. 2 , both the inner electrode 1 and the outer electrode 2 are electrically connected with the measurement circuit 3 , and in addition, the measurement circuit 3 is also connected in communication with the remote device.

In addition, in this embodiment, as shown in FIG. 1 , the outer electrode 2 and the inner electrode 1 are isolated and disconnected by the casing 4 , and as shown in FIG. 2 , both the inner electrode 1 and the outer electrode 2 are electrically connected to the measurement circuit 3 .

In addition, in practical application, as shown in FIG. 1 and FIG. 2 , the measurement circuit 3 is used to detect the resistance value and the voltage division value between the outer electrode 2 and the inner electrode 1 in real time. At the same time, the measurement circuit 3 is also used to detect The obtained resistance value and partial pressure value change, it is judged whether the casing 4 is damaged, and after it is judged that the casing 4 is damaged, an electrical signal is sent to the remote device.

From the above content, it is not difficult to see that since the inside of the housing 4 of the sensor is provided with the internal electrode 1 and the measuring circuit 3, and the outside of the housing 4 is provided with the external electrode 2, and both the internal electrode 1 and the external electrode 2 are electrically connected with the measuring circuit 3 , at the same time, the measurement circuit 3 is also connected to the remote device in communication, so in practical application, with the help of the conductive properties of the liquid to be measured, the resistance value and the partial pressure value between the inner electrode 1 and the outer electrode 2 can be detected by the measurement circuit 3 in real time. , and can judge whether the casing 4 of the liquid sensor is damaged according to the detected resistance value and partial pressure value change, that is, when the casing 4 of the liquid sensor is damaged, the inner electrode 1 and the outer electrode 2 can use the electrical conductivity of the liquid to be measured. The resistance value detected by the detection circuit 3 can be close to the resistance value of the liquid to be tested, that is, the loop impedance at this time is reduced, and the detected partial pressure value will also decrease. Therefore, the detection circuit 3 can easily realize Real-time monitoring of whether the casing 4 of the liquid sensor is damaged can effectively prevent misjudgment and missed judgment.

The second embodiment of the present invention relates to a liquid sensor, as shown in FIG. 3 , comprising: a housing 4 , a measuring electrode 5 , and the damage detection device of the first embodiment.

In addition, as shown in FIG. 3 , in this embodiment, the housing 4 includes: a casing 41 and a permeation device 42 . Wherein, the casing 41 has a first cavity 411 and a second cavity 412 separated from the first cavity 411 along the predetermined axis direction, and an opening 413 communicating with the first cavity 411 is further opened on the casing 41 . The permeation device 42 is disposed on the casing 41 and closes the opening 413 ; the permeation device 42 can be used for the target substance in the liquid to be detected to enter the first cavity 411 .

Next, as shown in FIG. 3 and FIG. 4 , the measurement electrode 5 is arranged in the first cavity 411 and is electrically connected to the measurement circuit 3 . At the same time, the measurement electrode 5 can also be used to conduct electrical conductivity with the target substance entering the first cavity. It is used to upload the electrochemical characteristic data of the target substance to the measurement circuit 3 .

In addition, the internal electrode 1 of the damage detection device is arranged in the first cavity 411, and the measurement circuit 3 is arranged in the second cavity.

From the above content, it is not difficult to see that since the inside of the housing 4 of the sensor is provided with the internal electrode 1 and the measuring circuit 3, and the outside of the housing 4 is provided with the external electrode 2, and both the internal electrode 1 and the external electrode 2 are electrically connected with the measuring circuit 3 At the same time, the measurement circuit 3 is also connected to the remote equipment in communication, so in practical application, with the help of the conductive properties of the liquid to be measured, the resistance value and the partial pressure value between the inner electrode 1 and the outer electrode 2 can be detected by the measurement circuit 3 in real time, According to the detected changes in the resistance value and the partial pressure value, it is determined whether the casing 41 or the penetrating device 42 of the liquid sensor is damaged, that is, when the casing 41 or the penetrating device 42 of the liquid sensor is damaged, the liquid to be tested floods into the casing. 41, the inner electrode 1 and the outer electrode 2 can be electrically connected by the liquid to be tested, so that the resistance value detected by the detection circuit 3 can be close to the resistance value of the liquid to be tested, that is, the loop impedance at this time is reduced, and at the same time The detected partial pressure value will also decrease accordingly. Therefore, the detection circuit 3 can easily monitor whether the casing 41 of the liquid sensor or the permeation device 42 is damaged in real time, and can effectively prevent misjudgments and missed judgments.

Specifically, in this embodiment, as shown in FIG. 3 , the housing 41 includes a top plate 414 , a bottom plate 415 , a side plate 416 and a partition plate 417 . Wherein, the top plate 414 and the bottom plate 415 are disposed opposite to each other along the predetermined axis direction, and the side plate 416 connects the top plate 414 and the bottom plate 415, and the side plate 416 surrounds the top plate 414 and the bottom plate 415 to form an inner cavity (not marked in the figure) At the same time, the partition plate 417 is arranged between the top plate 414 and the bottom plate 415 to divide the inner cavity into a first cavity 411 and a second cavity 412 . In addition, the top plate 414 is provided with an opening 413 communicating with the first cavity 411, and the infiltration device 42 is arranged on the top plate 414. And the opening 413 is closed. In addition, it should be noted that in this embodiment, as shown in FIG. 3 , the permeation device 42 is a permeable membrane. Of course, in practical application, the permeation device 42 can also adopt other permeation mechanisms, and in this embodiment , the specific type of the permeation device 42 is not limited.

In addition, in order to be able to timely detect by the internal electrode 1 and the external electrode 2 when the casing 41 or the penetrating device 42 is damaged and the liquid to be detected pours into the first cavity 411, in this embodiment, combined with As shown in FIG. 3 , the inner electrode 1 can be disposed on the inner side of the side plate 416 , and the outer electrode 2 is embedded in the side plate 416 . Therefore, when the casing 41 or the penetrating device 42 of the liquid sensor is damaged, causing the liquid to be measured to flood into the casing 41, the internal electrode 1 and the external electrode 2 can be electrically connected by the liquid to be measured, so that the detection circuit 3 can be electrically connected. The detected resistance value can be infinitely close to the resistance value of the liquid to be tested, that is, the circuit impedance at this time decreases, and the detected partial pressure value also decreases. At this time, the detection circuit 3 can send an electrical signal to the remote device. . When the inner electrode 1 and the outer electrode 2 are not electrically connected, that is, the resistance value detected by the detection circuit 3 tends to be infinite. At this time, the detection circuit 3 will not send an electrical signal to the remote device. With this arrangement of the external electrode 2 , the detection circuit 3 can easily detect whether the casing 41 and the penetrating device 42 are damaged through the internal electrode 1 and the external electrode 2 .

Moreover, as a preferred solution, the internal electrode 1 can be disposed adjacent to the top plate 414 , so that the internal electrode 1 can be far away from the separator 417 , so that the measuring electrode 5 of the liquid sensor of this embodiment is detecting the target substance flowing into the osmotic device 42 . , the influence of the target substance on the internal electrode 1 can be avoided. In addition, it should be noted that, in practical application, the internal electrode 1 can also be disposed on the side of the top plate 414 relative to the bottom plate 415, and the external electrode 2 can also be directly disposed on the outside of the side plate. The position of the inner electrode 1 inside the first cavity 411 and the position of the outer electrode 2 outside the casing 41 are specifically defined.

In addition, it is worth mentioning that a wiring channel (not marked in the figure) for the electrical connection between the external electrode 2 and the measuring circuit 3 is also formed in the side plate 416. The wiring channel opened in the side plate 416 can facilitate the The wiring for the electrical connection between the external electrode 2 and the measuring circuit 3 . In addition, in order to facilitate the detection of the electrochemical properties of the target substance by the measurement electrode 5, as shown in FIG. One end is in contact with the permeation device 42 , so that the measuring electrode 5 can facilitate the testing of the electrophysical and chemical parameters of the target substance entering the first cavity 411 .

The third embodiment of the present invention relates to a liquid sensor, as shown in FIG. 5 , comprising: a casing 4 , and the damage detection device of the first embodiment.

In addition, as shown in FIG. 5 , in this embodiment, the housing 4 includes a casing 41 and a permeation device 42 . The casing 41 has a first cavity 411 and a second cavity 412 separated from the first cavity 411 along the predetermined axis direction, and an opening 413 communicating with the first cavity 411 is further opened on the casing 41 . The permeation device 42 is disposed on the casing 41 and closes the opening 413 ; the permeation device 42 can be used for the target substance in the liquid to be detected to enter the first cavity 411 .

Next, as shown in FIG. 5 and FIG. 6 , the internal electrode 1 is disposed in the first cavity 411 and is electrically connected to the measurement circuit 3 , and the internal electrode 5 can also be used to conduct electrical conduction with the target substance entering the first cavity. It is used to upload the electrochemical characteristic data of the target substance to the measurement circuit 3 .

Specifically, in this embodiment, as shown in FIG. 5 , the structure of the casing 41 may be the same as that of the second embodiment. Specifically, the casing 41 may include: a top plate 414 , a bottom plate 415 , a side Plate 416 and Separator 417. Wherein, the top plate 414 and the bottom plate 415 are disposed opposite to each other along the predetermined axis direction, and the side plate 416 connects the top plate 414 and the bottom plate 415, and the side plate 416 surrounds the top plate 414 and the bottom plate 415 to form an inner cavity (not marked in the figure) At the same time, the partition plate 417 is arranged between the top plate 414 and the bottom plate 415 to divide the inner cavity into a first cavity 411 and a second cavity 412 . In addition, the top plate 414 is provided with an opening 413 communicating with the first cavity 411 , and the infiltration device 42 is disposed on the top plate 414 . And the opening 413 is closed. In addition, it should be noted that in this embodiment, as shown in FIG. 3 , the permeation device 42 is a permeable membrane. Of course, in practical application, the permeation device 42 can also adopt other permeation mechanisms, and in this embodiment , the specific type of the permeation device 42 is not limited.

In addition, in order that the casing 41 or the osmotic device 42 is damaged and the liquid to be detected pours into the first cavity 411, it can be detected by the internal electrode 1 and the external electrode 2 in time, and at the same time, the internal electrode 1 can be detected. Electrical conduction is achieved with the target substance entering the first cavity. In this embodiment, with reference to FIG. 3 , the connection between the external electrode 2 , the measuring circuit 3 and the casing 41 in this embodiment is the same as that in the first embodiment, and the corresponding internal electrode 1 is perpendicular to the separator 417 And, one end of the internal electrode 1 is connected to the separator 417 , and the other end of the internal electrode 1 is abutted against the permeation device 42 .

It is not difficult to see from the above content that this embodiment is roughly the same as the second embodiment, the main difference is that the measurement electrode in the second embodiment is omitted, and the internal electrode 1 is used as the measurement in the second embodiment. electrodes are used. That is, under normal circumstances, the electrochemical characteristic data of the target substance can be uploaded to the measurement circuit 3 by the internal electrode 1, and when the casing 41 or the penetrating device 42 is damaged, the resistance value detected by the detection circuit 3 can be close to The resistance value of the liquid to be tested will reduce the loop impedance, and at the same time, the partial pressure value detected by the detection circuit 3 will also decrease accordingly. In this way, the detection circuit 3 can also easily monitor whether the casing 41 or the penetration device 42 of the liquid sensor is damaged in real time, and can effectively prevent misjudgments and missed judgments.

The fourth embodiment of the present invention relates to a damage detection method for a liquid sensor, as shown in FIG. 7 , including the following steps:

Step 710: Detect the resistance value and the partial pressure value between the internal electrode provided in the housing of the liquid sensor and the external electrode provided outside the housing of the liquid sensor. Wherein, the outer electrode and the inner electrode are isolated and disconnected by the casing.

Step 720, according to the detected changes in the resistance value and the partial pressure value, determine whether the casing is damaged.

In step 730, if it is determined that the casing is damaged, an electrical signal is sent to the remote device, and if it is determined that the casing is damaged, the process returns to step 720 immediately.

Moreover, it is worth mentioning that in the step of judging whether the casing is damaged according to the detected changes in the resistance value and the partial pressure value, that is, step 720, the step specifically includes:

The detected resistance and voltage divider values are compared in real time with the preset resistance threshold range and voltage divider threshold range respectively.

If the detected resistance value and voltage divider value are within the resistance threshold value range and the voltage divider threshold value range, respectively, it is determined that the casing is damaged.

If the detected resistance value and voltage divider value are outside the resistance threshold value range and the voltage divider threshold value range, respectively, it is determined that the casing is not damaged.

Specifically, when the casing 41 or the penetrating device 42 of the liquid sensor is damaged, causing the liquid to be measured to flood into the casing 41, the internal electrode 1 and the external electrode 2 can be electrically connected by the liquid to be measured, thereby enabling the detection of The resistance value detected by the circuit 3 can be infinitely close to the resistance value of the liquid to be tested. At this time, the detection circuit 3 can send an electrical signal to the remote device. When the internal electrode 1 and the external electrode 2 are not electrically connected, that is, the resistance value detected by the detection circuit 3 tends to be infinite, or the resistance value after the internal motor 1 and the external motor 2 are electrically connected is relatively large, that is, the resistance value detected by the detection circuit 3 tends to be infinite. It indicates that the casing 41 and the penetrating device 42 are not damaged at this time, and the detection circuit 3 will not send an electrical signal to the remote device at this time. Through this arrangement of the inner electrode 1 and the outer electrode 2, the detection circuit 3 can be Whether the casing 41 and the permeation device 42 are damaged can be easily detected by the inner electrode 1 and the outer electrode 2 .

It is not difficult to see from the above content that this embodiment is an example of the damage detection method corresponding to the first embodiment, the second embodiment and the third embodiment, and this embodiment may be similar to the first embodiment and the second embodiment. It is implemented in cooperation with the third embodiment. The related technical details mentioned in the first embodiment, the second embodiment and the third embodiment are still valid in this embodiment, and are not repeated here in order to reduce repetition. Correspondingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment, the second embodiment and the third embodiment.

Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes in form and details can be made without departing from the spirit and the spirit of the present invention. scope.

Claims (14)

1. A damage detection device of a liquid sensor, characterized in that, comprising: The internal electrode is arranged in the casing of the liquid sensor; The external electrode is arranged outside the casing of the liquid sensor; The measuring circuit is arranged in the casing of the liquid sensor and communicates with the remote equipment; Wherein, the outer electrode and the inner electrode are isolated and disconnected by the casing, and both the inner electrode and the outer electrode are electrically connected to the measurement circuit; The measurement circuit is used for real-time detection of the resistance value and the voltage division value between the external electrode and the inner electrode, and the measurement circuit is also used for determining the resistance value and the voltage division value according to the detected change of the resistance value and the voltage division value. whether the casing is damaged, and after determining that the casing is damaged, send an electrical signal to the remote device. 2. A liquid sensor, characterized in that, comprising: The casing includes: a casing and a permeation device, the casing has a first cavity along a preset axis direction and a second cavity spaced apart from the first cavity, and the casing is further provided with openings on the casing an opening communicating with the first cavity; the permeation device is disposed on the casing and closes the opening; the permeation device is used for the target substance in the liquid to be detected to enter the first cavity; a measurement electrode, disposed in the first cavity, electrically connected to the measurement circuit, and electrically connected to the target substance entering the first cavity; The damage detection device according to claim 1, wherein the internal electrode is disposed in the first cavity, and the measurement circuit is disposed in the second cavity. 3. The liquid sensor of claim 2, wherein the housing comprises: The top plate and the bottom plate are arranged opposite to each other along the predetermined axis direction; a side plate, connecting the top plate and the bottom plate, and forming an inner cavity around the top plate and the bottom plate; a partition plate, which is arranged between the top plate and the bottom plate, and divides the inner cavity into the first cavity and the second cavity; Wherein, the opening communicated with the first cavity is formed on the top plate, the infiltration device is arranged on the top plate, and closes the opening. 4. The liquid sensor according to claim 3, wherein the internal electrode is disposed on one side of the top plate relative to the bottom plate; or, The inner electrode is disposed on the inner side of the side plate. 5 . The liquid sensor according to claim 4 , wherein the inner electrode is disposed on the inner side of the side plate and adjacent to the top plate. 6 . 6. The liquid sensor according to claim 3, wherein the external electrode is embedded in the side plate; Alternatively, the external electrodes are disposed outside the side plates. 7 . The liquid sensor according to claim 6 , wherein a wiring channel for electrically connecting the external electrode and the measurement circuit is further formed in the side plate. 8 . 8 . The liquid sensor according to claim 3 , wherein the measurement electrode is arranged perpendicular to the separator, one end of the measurement electrode is connected to the separator, and the other end of the measurement electrode is connected to the separator. 9 . The permeation device is offset. 9 . The liquid sensor according to claim 1 , wherein the permeation device is a semi-permeable membrane. 10 . 10. A liquid sensor, comprising: The casing includes: a casing and a permeation device, the casing has a first cavity along a preset axis direction and a second cavity spaced apart from the first cavity, and the casing is further provided with openings on the casing an opening communicating with the first cavity; the permeation device is disposed on the casing and closes the opening; the permeation device is used for the target substance in the liquid to be detected to enter the first cavity; The damage detection device according to claim 1, wherein the inner electrode is arranged in the first cavity, the measurement circuit is arranged in the second cavity, and the inner electrode is also used for entering and entering the first cavity. The target substance in the cavity is electrically conductive. 11. The liquid sensor of claim 10, wherein the housing comprises: The top plate and the bottom plate are arranged opposite to each other along the predetermined axis direction; a side plate, connecting the top plate and the bottom plate, and forming an inner cavity around the top plate and the bottom plate; a partition plate, which is arranged between the top plate and the bottom plate, and divides the inner cavity into the first cavity and the second cavity; Wherein, the opening communicated with the first cavity is formed on the top plate, the infiltration device is arranged on the top plate, and closes the opening. 12 . The liquid sensor according to claim 11 , wherein the internal electrode is arranged perpendicular to the separator, one end of the internal electrode is connected to the separator, and the other end of the internal electrode is connected to the separator. 13 . The permeation device is offset. 13. A method for detecting damage to a liquid sensor, comprising the steps of: Detecting the resistance value and the partial pressure value between the inner electrode arranged in the casing of the liquid sensor and the outer electrode arranged outside the casing of the liquid sensor; the outer electrode and the inner electrode are isolated and disconnected by the casing; According to the detected changes in the resistance value and the partial pressure value, determine whether the casing is damaged; If it is determined that the casing is damaged, an electrical signal is sent to the remote device. 14. The method for detecting damage of a liquid sensor according to claim 13, wherein in the step of judging whether the casing is damaged according to the detected changes in the resistance value and the partial pressure value, the method specifically comprises: Compare the detected resistance value and voltage divider value with the preset resistance threshold value range and voltage divider threshold value range in real time respectively; If the detected resistance value and voltage divider value are within the resistance threshold value range and the voltage divider threshold value range respectively, it is determined that the casing is damaged; If the detected resistance value and the voltage division value are outside the resistance threshold value range and the voltage division threshold value range, respectively, it is determined that the casing is not damaged.

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