Liquid pressure detection device and its liquid detection method, liquid thickness detection method

Abstract

A liquid pressure detection device and its liquid detection method, and a liquid thickness detection method thereof, are disclosed. The liquid pressure detection device includes: a pressure sensor having a pressure diaphragm capable of deformation under pressure; a base on which the pressure sensor is mounted, wherein the side of the pressure diaphragm in contact with the liquid is parallel to and faces away from the base; and a housing, a first end of which is mounted to the base, and a cover plate assembly mounted to a second end of which exposes at least a portion of the pressure diaphragm. This invention can detect dynamic or static water accumulation in a static state.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and in particular to a liquid pressure detection device and a liquid detection method and a liquid thickness detection method thereof. Background Technology

[0002] Currently, most airport runways are made of cement concrete. In rainy weather or when there is standing water, aircraft are prone to hydroplaning during takeoff, which can even lead to traffic accidents. This can range from blocking the runway to causing loss of life and property for passengers.

[0003] In existing pavement water film monitoring technologies, passive radar detection technology, mobile infrared spectroscopy, or capacitive sensing technology can be used. However, these technologies have problems such as poor measurement accuracy, inability to measure in a static state, or inability to detect the thickness of static water accumulation.

[0004] There is an urgent need for a liquid pressure detection device that can detect dynamic or static water accumulation under static conditions. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide a liquid pressure detection device and a liquid detection method and a liquid thickness detection method, which can detect dynamic or static water accumulation in a static state.

[0006] To address the aforementioned technical problems, embodiments of the present invention provide a liquid pressure detection device, comprising: a pressure sensor having a pressure diaphragm capable of deformation under stress; a base having the pressure sensor mounted on its surface, wherein the side of the pressure diaphragm in contact with the liquid is parallel to and faces away from the base; and a housing having a first end mounted on the base and a cover plate assembly mounted on a second end of the housing, wherein the cover plate assembly exposes at least a portion of the pressure diaphragm.

[0007] Optionally, the cover assembly includes a sensor mounting plate having one or more through holes, at least one hole exposing at least a portion of the pressure diaphragm.

[0008] Optionally, the cover assembly further includes: a top cover covering the sensor mounting plate; wherein the surface of the top cover has one or more drainage holes.

[0009] Optionally, the cover assembly further includes a filter structure located between the top cover and the sensor mounting plate for filtering liquid flowing in through the top cover.

[0010] Optionally, the cover plate assembly further includes a sealing ring located between the filter structure and the sensor mounting plate for fixing the filter structure.

[0011] Optionally, the pressure sensor is placed vertically, with the side of the pressure diaphragm in contact with the liquid perpendicular to the ground and facing upwards.

[0012] Optionally, the pressure sensor is selected from: piezoelectric pressure sensor, piezoresistive pressure sensor, capacitive pressure sensor and photoelectric pressure sensor.

[0013] Optionally, the liquid pressure detection device further includes a gas pressure sensor for detecting the current atmospheric pressure.

[0014] Optionally, the liquid pressure detection device further includes: a liquid detection sensor comprising an optical fiber lens and an optical reflector, wherein the reflective surface of the optical reflector faces the optical fiber lens, and the distance between the reflective surface of the optical reflector and the optical fiber lens is fixed; wherein the optical fiber lens is used to receive laser signals and emit them to the optical reflector, and then receive the laser reflection signals reflected from the optical reflector.

[0015] Optionally, the light transmittance of the material of the light reflector is greater than a preset light transmittance.

[0016] Optionally, the liquid pressure detection device further includes: an optical power detection module, which is integrated or separately installed on the liquid detection sensor; the optical power detection module is used to determine the first power of the laser signal emitted by the fiber optic lens to the optical reflector and the second power of the laser reflection signal.

[0017] To address the aforementioned technical problems, this invention provides a liquid detection method based on the liquid pressure detection device described above, comprising: receiving a laser signal using the fiber optic lens and transmitting it to the optical reflector, and then receiving a laser reflection signal reflected from the optical reflector; determining a first power of the laser signal emitted by the fiber optic lens to the optical reflector and a second power of the laser reflection signal using an optical power detection module; and determining that liquid is deposited on the surface of the liquid detection sensor if the quotient of the second power and the first power is greater than a preset threshold.

[0018] To address the aforementioned technical problems, this invention provides a liquid thickness detection method based on the liquid pressure detection device described above, comprising: determining the pressure applied to the pressure diaphragm of the pressure sensor; and determining the thickness of the liquid supported by the pressure diaphragm based on the pressure applied to the pressure diaphragm.

[0019] Optionally, the thickness of the liquid supported by the pressure diaphragm can be determined using the following formula, based on the pressure applied to the pressure diaphragm:

[0020]

[0021] Among them, h k (t) represents the thickness of the liquid that the pressure diaphragm is subjected to, F represents the pressure that the pressure diaphragm is subjected to, S represents the area of ​​the pressure diaphragm subjected to force, ρ represents the density of the liquid, and g represents the acceleration due to gravity.

[0022] Optionally, the thickness of the liquid supported by the pressure diaphragm can be determined using the following formula, based on the pressure applied to the pressure diaphragm:

[0023]

[0024] Among them, h k (t) represents the thickness of the liquid supported by the pressure diaphragm, F represents the pressure exerted on the pressure diaphragm, S represents the area of ​​the pressure diaphragm, ρ represents the density of the liquid, g represents the acceleration due to gravity, and ΔP c Used to indicate corrected atmospheric pressure.

[0025] Compared with the prior art, the technical solution of the embodiments of the present invention has the following beneficial effects:

[0026] In this embodiment of the invention, a liquid pressure detection device is provided. The pressure sensor is installed on the surface of the base. The side of the pressure diaphragm that contacts the liquid is parallel to the base and faces away from the base. The cover assembly exposes at least a portion of the pressure diaphragm. Thus, the liquid pressure detection device can be pre-set in a fixed location, such as buried underground, and the detection of dynamic or static water accumulation can be achieved in a static state through the exposed pressure diaphragm.

[0027] Furthermore, the cover assembly may include a sensor mounting plate with one or more through holes, thereby exposing the pressure diaphragm.

[0028] Furthermore, the cover assembly may have a top cover with one or more drainage holes, thereby ensuring that liquid flows to the surface of the pressure diaphragm and applies pressure to it.

[0029] Furthermore, the cover assembly may include a filter structure located between the top cover and the sensor mounting plate, thereby filtering liquid flowing to the surface of the pressure diaphragm.

[0030] Furthermore, the cover plate assembly may include a sealing ring located between the filter structure and the sensor mounting plate for fixing the filter structure to the sensor mounting plate.

[0031] Furthermore, the liquid pressure detection device may also include a liquid detection sensor, which includes an optical fiber lens capable of receiving laser signals and emitting them to the light reflector, and then receiving the laser reflection signal reflected from the light reflector. Thus, the first power of the laser signal emitted by the optical fiber lens to the light reflector and the second power of the laser reflection signal can be used to determine that liquid is deposited on the surface of the liquid detection sensor.

[0032] Furthermore, in this embodiment of the invention, the thickness of the liquid supported by the pressure diaphragm can be determined based on the pressure applied to the pressure diaphragm, thereby enabling the detection of dynamic or static water accumulation thickness in a static state. Attached Figure Description

[0033] Figure 1 This is an exploded structural diagram of a liquid pressure detection device according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a pressure sensor in an undeformed state according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of a pressure diaphragm in a deformed state in a pressure sensor according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of a liquid detection sensor according to an embodiment of the present invention;

[0037] Figure 5 This is a flowchart of a liquid detection method using a liquid pressure detection device according to an embodiment of the present invention;

[0038] Figure 6 This is a flowchart of a liquid thickness detection method using a liquid pressure detection device according to an embodiment of the present invention. Detailed Implementation

[0039] Existing pavement water film monitoring technologies include passive radar detection, mobile infrared spectroscopy, or capacitive sensing. However, these technologies suffer from problems such as poor measurement accuracy, inability to measure in a static state, or inability to detect stagnant water.

[0040] The inventors of this invention discovered through research that in an existing pavement water film monitoring technology, a passive radar detection technology can be used, but the detection end cannot be obstructed and the measurement accuracy is slightly lower.

[0041] Another existing technology for monitoring runway water film can be mobile infrared spectroscopy, which uses spectral absorption peaks to identify substances. However, if the water film is thick, the detection accuracy is poor. Furthermore, mobile infrared spectroscopy requires mounting the detector on a ground patrol vehicle and taking measurements while in motion. The movement of the patrol vehicle along the runway side may pose a safety hazard to aircraft takeoff and landing.

[0042] In another existing pavement water film monitoring technology, capacitive sensing technology can be used. However, capacitive sensing technology cannot detect objects that are stationary on the sensor. Therefore, it can only be used for dynamic detection during rain or when water is flowing, and cannot detect stationary water (such as the thickness of the water).

[0043] In this embodiment of the invention, a liquid pressure detection device is provided. The pressure sensor is installed on the surface of the base. The side of the pressure diaphragm that contacts the liquid is parallel to the base and faces away from the base. The cover assembly exposes at least a portion of the pressure diaphragm. Thus, the liquid pressure detection device can be pre-set in a fixed location, such as buried underground, and the detection of dynamic or static water accumulation can be achieved in a static state through the exposed pressure diaphragm.

[0044] To make the above-mentioned objectives, features and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Reference Figure 1 , Figure 1 This is an exploded view of the structure of a liquid pressure detection device according to an embodiment of the present invention.

[0046] The liquid pressure detection device may include: a pressure sensor 171, a base 17, a housing 16, and a cover plate assembly.

[0047] The pressure sensor 171 may have a pressure diaphragm that can deform when subjected to force.

[0048] Combined with reference Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of a pressure sensor in an undeformed state according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of a pressure diaphragm in a deformed state in a pressure sensor according to an embodiment of the present invention.

[0049] Specifically, the pressure sensor 21 has a pressure diaphragm 211. When subjected to force, the pressure diaphragm 211 deforms, producing a micro-displacement proportional to the applied pressure, thus changing the electrical parameter value of the pressure sensor 21. In a practical implementation, this change can be detected by electronic circuitry and converted into a measurement signal corresponding to this pressure.

[0050] Specifically, the pressure sensor 21 can output an electrical signal via the cable 22, such as the electrical parameter value or the measurement signal.

[0051] Furthermore, the pressure sensor can be selected from: piezoelectric pressure sensor, piezoresistive pressure sensor, capacitive pressure sensor and photoelectric pressure sensor.

[0052] Specifically, in a piezoelectric pressure sensor, the deformation of the pressure diaphragm under stress can change the current value of the piezoelectric pressure sensor; in a piezoresistive pressure sensor, the deformation of the pressure diaphragm under stress can change the resistance value of the piezoresistive pressure sensor; in a capacitive pressure sensor, the deformation of the pressure diaphragm under stress can change the capacitance value of the capacitive pressure sensor; and in a photoelectric pressure sensor, the deformation of the pressure diaphragm under stress can change the cavity length of the optical interference cavity of the photoelectric pressure sensor.

[0053] Continue to refer to Figure 1 The pressure sensor 171 is mounted on the surface of the base 17, wherein the side of the pressure diaphragm that is in contact with the liquid is parallel to the base 17 and faces away from the base 17.

[0054] That is to say, in Figure 1 In the liquid pressure detection device shown, the pressure diaphragm can be facing upwards, allowing liquid to fall onto the pressure diaphragm and apply pressure to it.

[0055] Furthermore, the pressure sensor 171 can be mounted on the surface of the base 17 by one or more of the following methods: screw fastening, embedding, welding, gluing, and implantation.

[0056] The first end of the housing 16 is mounted to the base 17, and the second end of the housing 16 is mounted with a cover plate assembly, wherein the cover plate assembly exposes at least a portion of the pressure diaphragm.

[0057] Furthermore, the pressure sensor 171 can be placed vertically, with the side of the pressure diaphragm in contact with the liquid perpendicular to the ground and facing upwards, thereby effectively allowing the liquid to fall onto the pressure diaphragm and apply pressure to it.

[0058] In this embodiment of the invention, a liquid pressure detection device is provided. The pressure sensor 171 is installed on the surface of the base 17. The side of the pressure diaphragm that contacts the liquid is parallel to the base and faces away from the base. The cover plate assembly exposes at least a portion of the pressure diaphragm, so that the liquid pressure detection device can be pre-set in a fixed location, such as buried underground, and the detection of dynamic or static water accumulation can be achieved in a static state through the exposed pressure diaphragm.

[0059] Furthermore, the cover plate assembly may include a sensor mounting plate 15.

[0060] The sensor mounting plate 15 may have one or more through holes 151, at least one hole exposing at least a portion of the pressure diaphragm.

[0061] like Figure 1 In the sensor mounting plate 15 shown, a through hole 151 can correspond to the top surface of the pressure sensor 171, so that liquid can flow through the hole 151 to the top surface of the pressure sensor 171, that is, to the surface of the pressure diaphragm, and apply pressure to it.

[0062] Furthermore, the sensor mounting plate 15 can be mounted on the housing 16 by one or more of the following methods: screw fastening, embedding, welding, and adhesive.

[0063] In an embodiment of the invention, the cover plate assembly may include a sensor mounting plate 15 having one or more through holes 151, thereby exposing a pressure diaphragm to which a liquid can apply pressure.

[0064] Furthermore, the cover assembly may also include: a top cover 11 covering the sensor mounting plate 15; wherein the surface of the top cover 11 has one or more drainage holes 111.

[0065] In this embodiment of the invention, the cover assembly may have a top cover 11 with one or more drainage holes 111, thereby ensuring that liquid flows to the surface of the pressure diaphragm and applies pressure to it.

[0066] Furthermore, the top cover 11 may have one or more mounting holes, so that the top cover 11 can be installed on the ground, for example, by using bolts or screws to install the top cover 11 through the mounting holes, so that the liquid pressure detection device can be pre-set in a fixed place, such as fixed on the ground, to achieve static measurement.

[0067] Furthermore, the cover assembly may also include a filter structure located between the top cover 11 and the sensor mounting plate 15 for filtering liquid flowing in through the top cover 11.

[0068] Specifically, since liquids often originate from rainwater or other sedimentary liquids, they may contain objects such as sand, debris, and leaves that could affect the accuracy of measurements. Therefore, filtration can improve the accuracy of liquid thickness measurements.

[0069] In this embodiment of the invention, the cover plate assembly may include a filter structure located between the top cover 11 and the sensor mounting plate 15, thereby filtering the liquid flowing to the surface of the pressure diaphragm.

[0070] Furthermore, the filter structure may include a filter 12 and a filter fixing base 13, thereby achieving fixed installation of the filter structure and effectively preventing its movement.

[0071] Furthermore, the cover plate assembly may also include a sealing ring 14 located between the filter structure and the sensor mounting plate 15 for fixing the filter structure.

[0072] In this embodiment of the invention, the cover plate assembly may include a sealing ring 14 for fixing the filter structure onto the sensor mounting plate 15.

[0073] Furthermore, the liquid pressure detection device may also include a gas pressure sensor 172.

[0074] The pressure sensor 172 can be used to detect the current atmospheric pressure.

[0075] It should be noted that, in order to ensure the detection effect of the pressure sensor 172, the sensor mounting plate 15 should avoid exposing the surface of the pressure sensor 172, that is, the surface of the pressure sensor 172 should not have any through holes.

[0076] In this embodiment of the invention, atmospheric pressure can vary significantly in working scenarios at different altitudes and latitudes. By setting up a pressure sensor 172, the current atmospheric pressure can be detected in real time, thereby correcting the calculated liquid thickness and further improving the accuracy of determining the liquid thickness.

[0077] Furthermore, the liquid pressure detection device may also include a liquid detection sensor 173.

[0078] Reference Figure 4 , Figure 4 This is a schematic diagram of the structure of a liquid detection sensor according to an embodiment of the present invention.

[0079] The liquid detection sensor may include an optical fiber lens 41 and a light reflector 42.

[0080] The reflective surface of the light reflector 42 can face the fiber optic lens 41, and the distance between the reflective surface of the light reflector 42 and the fiber optic lens 41 is fixed.

[0081] exist Figure 4 In the liquid detection sensor shown, the distance between the reflective surface of the light reflector 42 and the fiber optic lens 41 can be maintained as d. That is, the material of the light reflector 42 can be a non-elastic material.

[0082] The fiber optic lens 41 is used to receive laser signals and transmit them to the light reflector 42, and then receive the laser reflection signals reflected from the light reflector 42.

[0083] The laser signal can be input through optical fiber 43.

[0084] Furthermore, the liquid pressure detection device may also include: an optical power detection module (not shown), which is integrated or separately installed on the liquid detection sensor; the optical power detection module is used to determine the first power of the laser signal emitted by the fiber optic lens 41 to the optical reflector 42 and the second power of the laser reflection signal.

[0085] In this embodiment of the invention, the liquid pressure detection device may further include a liquid detection sensor, which includes an optical fiber lens 41 capable of receiving a laser signal and emitting it to the light reflector 42, and then receiving the laser reflection signal reflected from the light reflector 42. Thus, the first power of the laser signal emitted by the optical fiber lens 41 to the light reflector and the second power of the laser reflection signal can be used to determine that liquid is deposited on the surface of the liquid detection sensor.

[0086] Continue to refer to Figure 1 It should be noted that, in order to ensure the detection effect of the liquid detection sensor 173, the through hole 151 of the sensor mounting plate 15 should expose the surface of the liquid detection sensor 173, that is, the surface of the pressure sensor 172 should be provided with a through hole 151.

[0087] Specifically, when liquid is deposited on the surface of the liquid detection sensor 173, a water layer will form above the fiber optic lens. The water layer will reduce the light power of the reflected beam detected by the fiber optic lens, thereby determining whether there is liquid deposit on the surface of the liquid detection sensor 173, for example, determining whether there is water accumulation on an airplane runway.

[0088] Furthermore, the light transmittance of the material of the light reflector is greater than the preset light transmittance.

[0089] In this embodiment of the invention, by setting the light transmittance of the material of the light reflector to be greater than the preset light transmittance, the water layer can be more sensitive to the reduction of the light power of the reflected light beam, thereby improving the accuracy of judgment.

[0090] Reference Figure 5 , Figure 5 This is a flowchart of a liquid detection method using a liquid pressure detection device according to an embodiment of the present invention.

[0091] The liquid detection method of the liquid pressure detection device may include steps S51 to S53:

[0092] Step S51: The fiber optic lens is used to receive the laser signal and transmit it to the optical reflector, and then the laser reflection signal reflected from the optical reflector is received;

[0093] Step S52: Use an optical power detection module to determine the first power of the laser signal emitted by the fiber optic lens to the optical reflector and the second power of the laser reflection signal;

[0094] Step S53: If the quotient of the second power and the first power is greater than a preset threshold, it is determined that liquid is deposited on the surface of the liquid detection sensor.

[0095] Furthermore, the quotient of the second power and the first power can be calculated using the following formula:

[0096]

[0097] Among them, I r P is used to represent the ratio of optical power, that is, the quotient of the second power and the first power. R P0 is used to represent the second power, and P0 is used to represent the first power.

[0098] The liquid layer above the fiber optic lens reduces the optical power P of the reflected beam detected by the fiber optic lens. R , that is I r It will decrease as the thickness of the liquid layer increases, I r It will tend to 0.

[0099] In practice, a liquid detection sensor can be used first to detect whether liquid deposition exists. If liquid deposition is detected, a pressure sensor can then be used to detect the liquid thickness.

[0100] In this embodiment of the invention, a liquid detection device based on a liquid pressure detection device is also disclosed, which may include:

[0101] The fiber optic lens control module is used to receive laser signals using the fiber optic lens and transmit them to the optical reflector, and then receive the laser reflection signals reflected from the optical reflector.

[0102] The optical power detection module control module is used to determine the first power of the laser signal emitted by the fiber optic lens to the optical reflector and the second power of the laser reflection signal using the optical power detection module;

[0103] A liquid deposition determination module is used to determine that liquid is deposited on the surface of the liquid detection sensor when the quotient of the second power and the first power is greater than a preset threshold.

[0104] For details regarding the principle, implementation, and beneficial effects of this liquid detection device based on liquid pressure detection, please refer to the preceding text. Figure 5 The relevant description of the liquid detection method based on the liquid pressure detection device shown is not repeated here.

[0105] Reference Figure 6 , Figure 6 This is a flowchart of a liquid thickness detection method using a liquid pressure detection device according to an embodiment of the present invention. The liquid thickness detection method may include steps S61 to S62:

[0106] Step S61: Determine the pressure on the pressure diaphragm of the pressure sensor;

[0107] Step S62: Determine the thickness of the liquid that the pressure diaphragm bears based on the pressure it receives.

[0108] In the specific implementation of step S61, the pressure diaphragm can deform when subjected to force, producing a micro-displacement proportional to the applied pressure, thereby changing the electrical parameter values ​​of the pressure sensor.

[0109] In this embodiment of the invention, conventional pressure sensor technology can be used to determine the pressure on the pressure diaphragm, and no limitation is imposed here.

[0110] In one specific embodiment of step S62, the thickness of the liquid supported by the pressure diaphragm can be determined using the following formula, based on the pressure applied to the pressure diaphragm:

[0111]

[0112] Among them, h k (t) represents the thickness of the liquid that the pressure diaphragm is subjected to, F represents the pressure that the pressure diaphragm is subjected to, S represents the area of ​​the pressure diaphragm subjected to force, ρ represents the density of the liquid, and g represents the acceleration due to gravity.

[0113] Specifically, the general formula for liquid pressure is:

[0114] P = ρgh

[0115] The above formula can be obtained from F=PS.

[0116] In another specific embodiment of step S62, the thickness of the liquid supported by the pressure diaphragm can be determined using the following formula, based on the pressure applied to the pressure diaphragm:

[0117]

[0118] Among them, h k (t) represents the thickness of the liquid supported by the pressure diaphragm, F represents the pressure exerted on the pressure diaphragm, S represents the area of ​​the pressure diaphragm, ρ represents the density of the liquid, g represents the acceleration due to gravity, and ΔP c Used to indicate corrected atmospheric pressure.

[0119] It should be noted that, in a pressure sensor according to an embodiment of the present invention, the pressure sensor may have a sealed chamber, and one end of the sealed chamber has a pressure diaphragm that can deform under force.

[0120] That is, in this pressure sensor, one end of the sealed chamber can be sealed by the pressure diaphragm. For example, when manufacturing the pressure sensor, a certain amount of gas is encapsulated into the sealed chamber of the pressure sensor, so that when liquid is deposited on the pressure diaphragm, the gas density in the sealed chamber can change.

[0121] Where, ΔP c This can be used to represent the pressure difference between the atmospheric pressure at the current location and the atmospheric pressure at the manufacturing location of the pressure sensor. It is understood that during the manufacturing of the pressure sensor, the amount of gas encapsulated in the sealed chamber is fixed. However, in working environments with different altitudes and latitudes, atmospheric pressure can vary significantly, causing the pressure diaphragm of the optical interference cavity to bulge or dent due to the pressure difference. In this embodiment of the invention, ΔP is introduced... c This parameter can correct the calculated thickness of the liquid, further improving the accuracy of determining the liquid thickness.

[0122] In this embodiment of the invention, the thickness of the liquid supported by the pressure diaphragm can also be determined based on the pressure applied to the pressure diaphragm, thereby enabling the detection of dynamic or static water accumulation thickness in a static state.

[0123] In this embodiment of the invention, a liquid thickness detection device based on a liquid pressure detection device is also disclosed, which may include:

[0124] A pressure determination module is used to determine the pressure applied to the pressure diaphragm of the pressure sensor;

[0125] The liquid thickness determination module is used to determine the thickness of the liquid that the pressure diaphragm bears based on the pressure it receives.

[0126] For details regarding the principle, implementation, and beneficial effects of this liquid thickness detection device based on liquid pressure detection, please refer to the preceding text. Figure 6 The description of the liquid thickness detection method based on the liquid pressure detection device shown is not repeated here.

[0127] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A liquid pressure detecting device characterized by comprising: The pressure sensor has a pressure diaphragm that can be deformed after being subjected to force. The base has a surface on which the pressure sensor is mounted, wherein the side of the pressure diaphragm that is in contact with the liquid is parallel to the base and faces away from the base. The housing has a first end that is mounted to the base and a second end that has a cover plate assembly mounted thereto. The cover plate assembly exposes at least a portion of the pressure diaphragm. The gas pressure sensor is used to detect the current atmospheric pressure. The surface of the gas pressure sensor is not provided with a through hole. The cover plate assembly further includes a sensor mounting disc that has one or more through holes, at least one of which exposes at least a portion of the pressure diaphragm. The cover plate assembly further includes: A top cover that covers the sensor mounting disc. The surface of the top cover has one or more water leakage holes. The cover plate assembly further includes:

2. The liquid pressure detecting apparatus according to claim 1, wherein A filter screen structure located between the top cover and the sensor mounting disc, for filtering the liquid that flows in through the top cover. The cover plate assembly further includes:

3. The liquid pressure detecting apparatus according to claim 2, wherein A sealing ring located between the filter screen structure and the sensor mounting disc, for fixing the filter screen structure. The pressure sensor is placed vertically, and the side of the pressure diaphragm that is in contact with the liquid is perpendicular to the ground and faces upwards.

4. The liquid pressure detecting apparatus according to claim 1, wherein The pressure sensor is selected from:

5. The liquid pressure detecting apparatus according to claim 1, wherein A piezoelectric pressure sensor, a piezoresistive pressure sensor, a capacitive pressure sensor, and a photoelectric pressure sensor. The liquid detection sensor includes an optical fiber lens and a light reflecting plate, the reflecting surface of the light reflecting plate faces the optical fiber lens, and the distance between the reflecting surface of the light reflecting plate and the optical fiber lens is fixed.

6. The liquid pressure detecting apparatus according to claim 1, wherein The optical fiber lens is used to receive a laser signal and emit it to the light reflecting plate, and then receive a laser reflection signal reflected from the light reflecting plate. The light transmittance of the material of the light reflecting plate is greater than a preset light transmittance. The optical power detection module is integrated or separately mounted on the liquid detection sensor.

7. The liquid pressure detecting apparatus according to claim 6, wherein The optical power detection module is used to determine the first power of the laser signal emitted by the optical fiber lens to the light reflecting plate and the second power of the laser reflection signal.

8. The liquid pressure detecting apparatus according to claim 6, wherein The optical power detection module is used to determine the first power of the laser signal emitted by the optical fiber lens to the light reflecting plate and the second power of the laser reflection signal. If the quotient of the second power and the first power is greater than a preset threshold value, it is determined that the surface of the liquid detection sensor is deposited with liquid. The pressure of the pressure diaphragm of the pressure sensor is determined.

9. A liquid detection method based on the liquid pressure detection apparatus according to claim 8, characterized by, The thickness of the liquid borne by the pressure diaphragm is determined according to the pressure of the pressure diaphragm. The thickness of the liquid borne by the pressure diaphragm is determined according to the pressure of the pressure diaphragm using the following formula: The thickness of the liquid borne by the pressure diaphragm is determined according to the pressure of the pressure diaphragm using the following formula: ​ 10. A liquid thickness detection method based on the liquid pressure detection apparatus according to claim 1, characterized by, ​ ​ ​ 11. The liquid thickness detection method of the liquid pressure detection apparatus according to claim 10, wherein ​ ， where h k (t) is the thickness of the liquid against which the pressure diaphragm is subjected, F is the pressure to which the pressure diaphragm is subjected, S is the area of the pressure diaphragm subjected to force, p is the density of the liquid, and g is the acceleration due to gravity.

12. The liquid thickness detection method of the liquid pressure detection apparatus according to claim 10, wherein ​ ， wherein h k (t) is used to represent the thickness of the liquid against which the pressure diaphragm is subjected, F is used to represent the pressure against which the pressure diaphragm is subjected, S is used to represent the area of the pressure diaphragm against which the force is applied, p is used to represent the density of the liquid, g is used to represent the acceleration due to gravity, and ΔP c is used to represent the correction for atmospheric pressure.

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