Laser liquid level measuring circuit and equipment

Abstract

The utility model discloses a laser liquid level measuring circuit and equipment, relates to the technical field of liquid level measurement, and discloses a laser liquid level measuring circuit arranged at the top in a sealed liquid box body, and the laser liquid level measuring circuit comprises an environment monitoring unit arranged at the middle position of the top; the first measuring unit is obliquely attached to the first position of the top, and the power supply end is connected with the environment monitoring unit; the second measuring unit is obliquely attached to a second position of the top, the power supply end is connected with the environment monitoring unit, and the second position is symmetrical to the first position; the liquid level measurement control unit is connected with the environment monitoring unit, the control end of the first measurement unit and the control end of the second measurement unit, and is used for collecting and controlling the first measurement unit to emit the laser until the second measurement unit receives the laser; or collecting and controlling the second measuring unit to emit the laser until the interval duration of receiving the laser by the first measuring unit so as to determine the liquid level of the sealed liquid box body. The functionality of liquid level measurement is improved.

Description

Technical Field

[0001] This application relates to the field of liquid level measurement technology, and in particular to a laser liquid level measurement circuit and device. Background Technology

[0002] As the demand for liquid level measurement increases in various fields, users are also placing higher demands on the methods of liquid level measurement in sealed liquid tanks.

[0003] Traditional liquid level measurement in sealed liquid tanks involves directly using sensors to measure the liquid level. An alarm is triggered when the liquid level exceeds the sensor's preset level. This method has significant drawbacks, as the sensor can only measure levels exceeding a predefined limit (meaning it can only indicate whether the liquid level exceeds a predefined limit, but cannot specify the actual value). Consequently, this method suffers from limited functionality in liquid level measurement.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0005] The main purpose of this application is to provide a laser liquid level measurement circuit and device, which aims to solve the technical problem of low functionality in liquid level measurement.

[0006] To achieve the above objectives, this application provides a laser liquid level measurement circuit, which is disposed at the top of a sealed liquid tank. The laser liquid level measurement circuit includes:

[0007] An environmental monitoring unit is located at the top center of the sealed liquid tank.

[0008] A first measuring unit is obliquely attached to a first position on the top of the sealed liquid tank, and the power supply terminal of the first measuring unit is connected to the environmental monitoring unit.

[0009] The second measuring unit is obliquely attached to the top of the sealed liquid tank at a second position. The power supply terminal of the second measuring unit is connected to the environmental monitoring unit. The second position is a symmetrical position to the first position.

[0010] A liquid level measurement and control unit is connected to the environmental monitoring unit, the control terminal of the first measurement unit, and the control terminal of the second measurement unit. The liquid level measurement and control unit is used to collect the interval between controlling the first measurement unit to emit a laser and the second measurement unit to receive the laser; or, to collect the interval between controlling the second measurement unit to emit a laser and the first measurement unit to receive the laser, so as to determine the liquid level of the sealed liquid tank based on the interval.

[0011] In one embodiment, the environmental monitoring unit includes:

[0012] A concentration detector is located at the top center of the sealed liquid tank. The concentration detector is configured to output a high level when the concentration value is greater than a preset concentration threshold, and output a low level when the concentration value is less than or equal to the preset concentration threshold.

[0013] A voltage selector, wherein the control terminal of the voltage selector is connected to the concentration detector, the first input terminal of the voltage selector is connected to a first voltage source, the second input terminal of the voltage selector is connected to a second voltage source, and the output terminal of the voltage selector is connected to the power supply terminals of the first measurement unit and the second measurement unit.

[0014] In one embodiment, the first position at the top of the sealed liquid tank includes a first launching position and a first receiving position, and the first measuring unit includes:

[0015] A first laser is movably attached to the first emission position. The power supply terminal of the first laser is connected to a voltage selector in the environmental monitoring unit. The movable attachment includes the middle position of the first laser being obliquely fixed to the first emission position, and the first laser being able to move up and down.

[0016] A first direction adjustment subunit, wherein the first adjustment end of the first direction adjustment subunit is mechanically connected to the active control end of the first laser, and the control end of the first direction adjustment subunit is connected to the liquid level measurement and control unit;

[0017] A first photosensitive element is movably attached to the first receiving position. The active control end of the first photosensitive element is mechanically connected to the second adjustment end of the first direction adjustment subunit. The output end of the first photosensitive element is connected to the liquid level measurement and control unit.

[0018] In one embodiment, the second position at the top of the sealed liquid tank includes a second transmitting position and a second receiving position, wherein the second transmitting position is a symmetrical position to the second receiving position, and the first transmitting position is a symmetrical position to the first receiving position. The second measuring unit includes:

[0019] A second laser is movably attached to the second emission position. The power supply terminal of the second laser is connected to the voltage selector in the environmental monitoring unit. The movable attachment includes the middle position of the second laser being obliquely fixed to the second emission position, and the second laser being able to move up and down.

[0020] The second direction adjustment subunit has a first adjustment end that is mechanically connected to the active control end of the second laser, and a control end that is connected to the liquid level measurement and control unit.

[0021] The second photosensitive element is movably attached to the second receiving position. The active control end of the second photosensitive element is mechanically connected to the second adjustment end of the second direction adjustment subunit. The output end of the second photosensitive element is connected to the liquid level measurement and control unit.

[0022] In one embodiment, the first direction adjustment subunit includes:

[0023] A first fixed gear is fixed to the movable control end of the first laser, and the control end of the first fixed gear is connected to the liquid level measurement and control unit.

[0024] The second fixed gear is fixed to the movable control end of the first photosensitive element, and the control end of the second fixed gear is connected to the liquid level measurement and control unit.

[0025] The second direction adjustment subunit includes:

[0026] The third fixed gear is fixed to the movable control end of the second laser, and the control end of the third fixed gear is connected to the liquid level measurement and control unit;

[0027] A fourth fixed gear is fixed to the movable control end of the second photosensitive element, and the control end of the fourth fixed gear is connected to the liquid level measurement and control unit.

[0028] In one embodiment, the liquid level measurement and control unit includes:

[0029] A measurement controller, the measurement controller including a first steering control terminal and a second steering control terminal;

[0030] A first synchronous motor, the output end of which is connected to the control end of the first fixed gear, and the control end of which is connected to the first steering control end;

[0031] The second synchronous motor has its output end connected to the control end of the second fixed gear, and its control end is connected to the second steering control end.

[0032] The third synchronous motor, the output end of which is connected to the control end of the third fixed gear, and the control end of the third synchronous motor is connected to the first steering control end;

[0033] The fourth synchronous motor has its output end connected to the control end of the fourth fixed gear, and its control end is connected to the second steering control end.

[0034] In one embodiment, the measurement controller further includes a working control terminal, and the liquid level measurement control unit includes:

[0035] A mode selector, wherein the control terminal of the mode selector is connected to the working control terminal, the input terminal of the mode selector is connected to the voltage selector in the environmental monitoring unit, the first output terminal of the mode selector is connected to the power supply terminal of the first laser, and the second output terminal of the mode selector is connected to the power supply terminal of the second laser.

[0036] In one embodiment, the liquid level measurement and control unit includes:

[0037] A flight timer, connected to a measurement controller in the liquid level measurement control unit, is used to determine the interval duration.

[0038] In addition, to achieve the above objectives, a laser liquid level measuring device is also provided, which includes the laser liquid level measuring circuit described above.

[0039] In one embodiment, the laser level measuring device includes:

[0040] The first packaging box is used to encapsulate the first measuring unit in the laser liquid level measuring circuit. The first laser in the first measuring unit is disposed at the first opening of the first packaging box, and the first photosensitive element in the first measuring unit is disposed at the second opening of the first packaging box. The first opening is an oblique opening, and a first arc-shaped protective structure is provided on the lower edge of the first opening.

[0041] The second packaging box is used to encapsulate the second measuring unit in the laser liquid level measuring circuit. The second laser in the second measuring unit is disposed at the third opening of the second packaging box, and the second photosensitive element in the second measuring unit is disposed at the fourth opening of the second packaging box. The third opening is an oblique opening, and a second arc-shaped protective structure is provided on the lower edge of the third opening. The liquid level measuring and control unit in the laser liquid level measuring circuit is separately disposed in the first packaging box and the second packaging box.

[0042] This application provides a laser liquid level measurement circuit disposed at the top of a sealed liquid tank, including an environmental monitoring unit positioned at the center of the top of the sealed liquid tank; a first measuring unit obliquely attached to a first position on the top of the sealed liquid tank, with its power supply connected to the environmental monitoring unit; a second measuring unit obliquely attached to a second position on the top of the sealed liquid tank, with its power supply connected to the environmental monitoring unit, wherein the second position is a symmetrical position to the first position; and a liquid level measurement control unit connected to the environmental monitoring unit, the control terminals of the first measuring unit and the second measuring unit. The liquid level measurement control unit is used to collect the interval between the first measuring unit emitting laser light and the second measuring unit receiving laser light; or, to collect the interval between the second measuring unit emitting laser light and the first measuring unit receiving laser light, to determine the liquid level of the sealed liquid tank based on the interval. This laser liquid level measurement circuit is disposed at the center of the sealed liquid tank. The circuit uses a first measuring unit positioned obliquely against the top of the sealed liquid tank, and a second measuring unit positioned obliquely against the top of the sealed liquid tank at a second position (the second position being the symmetrical position to the first position). This allows for the acquisition and control of the interval between the first measuring unit emitting a laser and the second measuring unit receiving the laser; or, the acquisition and control of the second measuring unit emitting a laser and the first measuring unit receiving the laser. Based on this interval, the liquid level in the sealed liquid tank is determined. This avoids the limitation of sensors that can only measure levels exceeding a predefined limit (i.e., only know if the liquid level exceeds a predefined limit, but cannot specify the actual liquid level). This laser liquid level measurement circuit, by acquiring and controlling the interval between the first measuring unit emitting a laser and the second measuring unit receiving the laser, or the acquisition and control of the second measuring unit emitting a laser and the first measuring unit receiving the laser, determines the liquid level in the sealed liquid tank based on the interval. This provides real-time and clear information about the liquid level, thereby improving the functionality of liquid level measurement. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the framework of the first embodiment of the laser liquid level measurement circuit of this application;

[0044] Figure 2 This is a schematic diagram of the environmental monitoring unit in the laser liquid level measurement circuit of this application;

[0045] Figure 3 This is a schematic diagram of a frame of the measuring unit in the laser liquid level measuring circuit of this application;

[0046] Figure 4 This is a schematic diagram of a frame of the liquid level measurement control unit in the laser liquid level measurement circuit of this application;

[0047] Figure 5 This is a schematic diagram of the installation of the laser liquid level measurement circuit of this application;

[0048] Figure 6 This is a schematic diagram of a scenario for the first embodiment of the laser liquid level measuring device of this application.

[0049] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0050] Explanation of icon numbers:

[0051] 200. Sealed liquid tank; 210. Liquid level in the sealed liquid tank; 10. Environmental monitoring unit; 20. First measurement unit; 30. Second measurement unit; 40. Liquid level measurement and control unit; 101. Incident laser; 102. Reflected laser; 103. Fixed structure; 11. Concentration detector; 12. Voltage selector; 41. Measurement controller; 46. Mode selector; 21. First laser; 31. Second laser; 310. First voltage source; 320. Second voltage source; 22. First direction adjustment subunit; 23. First... 32. Photosensitive element; 33. Second direction adjustment subunit; 221. Second photosensitive element; 222. First fixed gear; 222. Second fixed gear; 321. Third fixed gear; 322. Fourth fixed gear; 42. First synchronous motor; 43. Second synchronous motor; 44. Third synchronous motor; 45. Fourth synchronous motor; 60. First packaging box; 61. First opening; 62. Second opening; 63. First arc-shaped protective structure; 70. Second packaging box; 71. Third opening; 72. Fourth opening; 73. Second arc-shaped protective structure. Detailed Implementation

[0052] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0053] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0054] Traditional liquid level measurement in sealed liquid tanks involves directly using sensors to measure the liquid level. An alarm is triggered when the liquid level exceeds the sensor's set level. This method only indicates whether the actual liquid level exceeds the user-defined value. For more precise measurement, multiple sensors with close spacing are required, leading to wasted resources. Furthermore, measuring corrosive or potentially damaging liquids significantly increases costs, primarily due to frequent sensor replacements or the need for high-quality sensors designed with corrosion-resistant materials.

[0055] Therefore, based on the shortcomings of the above-mentioned laser liquid level measurement circuits, the laser liquid level measurement circuit of this application is proposed: It is installed at the top of the sealed liquid tank, with a first measuring unit obliquely attached to the top of the sealed liquid tank at a first position, and a second measuring unit obliquely attached to the top of the sealed liquid tank at a second position (the second position is a symmetrical position to the first position). This allows for the acquisition and control of the interval between the first measuring unit emitting laser light and the second measuring unit receiving laser light; or, the acquisition and control of the second measuring unit emitting laser light and the first measuring unit receiving laser light, to determine the liquid level of the sealed liquid tank based on the interval. This avoids the phenomenon that sensor measurements can only measure liquid levels exceeding a user-defined level (i.e., it can only know whether the liquid level exceeds a user-defined level, but cannot specify the actual value of the liquid level). This laser liquid level measurement circuit, by acquiring and controlling the interval between the first measuring unit emitting laser light and the second measuring unit receiving laser light, or the acquisition and control of the second measuring unit emitting laser light and the first measuring unit receiving laser light, to determine the liquid level of the sealed liquid tank based on the interval, can provide real-time and clear information about the liquid level, thereby improving the functionality of liquid level measurement.

[0056] Based on this, embodiments of this application provide a laser liquid level measurement circuit, referring to... Figure 1 , Figure 1 This is a schematic diagram of the framework of the first embodiment of the laser liquid level measurement circuit of this application.

[0057] Reference Figure 1 This application provides a laser liquid level measurement circuit, which is disposed at the top inside a sealed liquid tank 200. The laser liquid level measurement circuit includes:

[0058] Environmental monitoring unit 10 is located at the top center of the sealed liquid tank 200;

[0059] The first measuring unit 20 is obliquely attached to the top of the sealed liquid tank 200 at a first position, and the power supply terminal of the first measuring unit 20 is connected to the environmental monitoring unit 10.

[0060] The second measuring unit 30 is obliquely attached to the top of the sealed liquid tank 200 at a second position. The power supply terminal of the second measuring unit 30 is connected to the environmental monitoring unit 10. The second position is a symmetrical position to the first position.

[0061] The liquid level measurement and control unit 40 is connected to the control terminals of the environmental monitoring unit 10, the first measurement unit 20, and the second measurement unit 30. The liquid level measurement and control unit 40 is used to collect the interval between the first measurement unit 20 emitting a laser and the second measurement unit 30 receiving the laser; or, to collect the interval between the second measurement unit 30 emitting a laser and the first measurement unit 20 receiving the laser, so as to determine the liquid level 210 of the sealed liquid tank 200 based on the interval.

[0062] In this embodiment, the laser liquid level measurement circuit is located at the top of the sealed liquid tank 200 (especially for target liquids that are corrosive or harmful to circuit components) to prevent damage to the components caused by the target liquid, thereby ensuring the service life of the entire laser liquid level measurement circuit for liquid level measurement. The laser liquid level measurement circuit includes an environmental monitoring unit 10, a first measurement unit 20, a second measurement unit 30, and a liquid level measurement control unit 40. The environmental monitoring unit 10 is positioned at the top center of the sealed liquid tank 200 to collect environmental data within the entire tank. This data is then used to control the first and second measurement units 20 and 30, adjusting their output characteristics. For example, if the permeability inside the sealed liquid tank 200 is poor (the target liquid's evaporation affects laser transmission), a higher voltage can be applied to the first and second measurement units 20 and 30 (the composition of the environmental monitoring unit 10 will be explained later) to ensure effective laser measurement (primarily to avoid the influence of vaporized liquid on laser reflection). Both the first and second measurement units 20 and 30 are angled, which allows for better fit within the curved sealed liquid tank 200 and prevents damage to the laser devices from vaporized corrosive liquid, thus extending the lifespan of the laser liquid level measurement circuit. It is worth noting that... (The text abruptly ends here, likely due to an incomplete sentence or missing information.) Figure 1The various units in the laser liquid level measurement circuit can be adaptively arranged according to the actual situation. For example, the various units in the laser liquid level measurement circuit can be directly embedded in the top of the sealed liquid tank 200, or they can be arranged on the inside and outside of the sealed liquid tank 200 (the liquid level measurement control unit 40 is arranged on the outside to avoid the water vapor from the liquid vaporization affecting the components). The circuit or mechanical connection can be made through the connection port at the top of the sealed liquid tank 200. Of course, except for the first measurement unit 20 and the second measurement unit 30 need to be arranged symmetrically (to facilitate laser emission and reception, and to quickly adjust the angle based on different liquid levels), the units can be adaptively arranged according to the actual situation. For example, the liquid level measurement control unit 40 can be arranged in the middle position of the top inside the sealed liquid tank 200, and the environmental monitoring unit 10 can be arranged on the liquid level measurement control unit 40, etc.

[0063] In one embodiment, the liquid level measurement control unit 40 is connected to the control terminals of the environmental monitoring unit 10, the first measurement unit 20, and the second measurement unit 30. Thus, during actual liquid level measurement, the interval between the first measurement unit 20 emitting laser and the second measurement unit 30 receiving laser can be collected; or, the interval between the second measurement unit 30 emitting laser and the first measurement unit 20 receiving laser can be collected, and the actual liquid level can be determined based on the interval. The principle of laser-based liquid level determination can be summarized as follows (using a commonly used triangle calculation method): The actual interval is 2 seconds, and the laser velocity is A. Therefore, the sum of the lengths of the incident laser 101 and the reflected laser 102 is 2A (the vertical dotted line in the middle represents the defined central axis of the sealed liquid tank 200; the central axis is used as the reflection point for each liquid level measurement, meaning that the liquid level is searched from top to bottom and from bottom to top along the central axis. If there is no liquid level above, it will not reflect to the other side, and the process will proceed downwards). Assuming the distance between the first measuring unit 20 and the second measuring unit 30 is B, the third side can be calculated based on the two sides of the right triangle being A and B / 2, and thus the third side represents the liquid level at that moment. In one scenario, a timer can be used directly for timing. The output of the timer is input to the first input of a multiplier. The second input of the multiplier is connected to a first fixed value unit, whose value is the speed of the laser. The output of the multiplier is then connected to a divider, which is connected to a second fixed value unit, whose value is 2. The output of the divider and a third fixed value unit (which is half the distance between the actual first measurement unit 20 and the second measurement unit 30) are each connected to a squaring device. The output of the divider is output through the first squaring device, and the output of the third fixed value unit is output through the second squaring device. The outputs of the first and second squaring devices are connected to an adder. The output of the adder is connected to a square root device (which can be set according to the chip logic, such as using a square root chip). The square root device is then used to determine the liquid level 210 of the sealed liquid tank 200. It is worth noting that the liquid level 210 of the sealed liquid tank 200 can be defined as the liquid level based on the first measuring unit 20 and the second measuring unit 30, or it can be based on the top liquid level inside the sealed liquid tank 200. However, it is necessary to add the distance from the top of the sealed liquid tank 200 to the first measuring unit 20. In this way, the liquid level 210 of the sealed liquid tank 200 can be clearly determined based on the laser liquid level measurement circuit, thereby improving the functionality of the liquid level measurement.

[0064] It is worth noting that before determining the acquisition interval, the first measurement unit 20 and the second measurement unit 30 need to be adjusted to ensure that the lasers emitted and received by the first measurement unit 20 and the second measurement unit 30 form an isosceles triangle. The receiving and transmitting instruments in the first measurement unit 20 and the second measurement unit 30 can be adjusted simultaneously. When the laser is received, the time from emission to reception can be directly determined as the interval. Since the lowest liquid level of the entire sealed liquid tank 200 is known, the waiting time can be adjusted each time to be the time for the lowest liquid level. The waiting time can then be adjusted to complete the liquid level measurement of the sealed liquid tank 200, thus ensuring the functionality of the liquid level measurement.

[0065] In this embodiment, a laser liquid level measurement circuit is provided, which is disposed at the top of a sealed liquid tank. The circuit includes an environmental monitoring unit positioned at the center of the top of the sealed liquid tank; a first measuring unit obliquely attached to a first position on the top of the sealed liquid tank, with its power supply connected to the environmental monitoring unit; a second measuring unit obliquely attached to a second position on the top of the sealed liquid tank, with its power supply connected to the environmental monitoring unit, wherein the second position is a symmetrical position to the first position; and a liquid level measurement control unit connected to the environmental monitoring unit, the control terminals of the first and second measuring units. The liquid level measurement control unit is used to collect the interval between the first measuring unit emitting laser light and the second measuring unit receiving laser light; or, to collect the interval between the second measuring unit emitting laser light and the first measuring unit receiving laser light, to determine the liquid level of the sealed liquid tank based on the interval. This laser liquid level measurement circuit is disposed at the top of a sealed liquid tank. The circuit uses a first measuring unit positioned obliquely against the top of the sealed liquid tank, and a second measuring unit positioned obliquely against the top of the sealed liquid tank at a second position (the second position being the symmetrical position to the first position). This allows for the acquisition and control of the interval between the first measuring unit emitting a laser and the second measuring unit receiving the laser; or, the acquisition and control of the second measuring unit emitting a laser and the first measuring unit receiving the laser. Based on this interval, the liquid level in the sealed liquid tank is determined. This avoids the limitation of sensors that can only measure levels exceeding a predefined limit (i.e., only know if the liquid level exceeds a predefined limit, but cannot specify the actual liquid level). This laser liquid level measurement circuit, by acquiring and controlling the interval between the first measuring unit emitting a laser and the second measuring unit receiving the laser, or the acquisition and control of the second measuring unit emitting a laser and the first measuring unit receiving the laser, determines the liquid level in the sealed liquid tank based on the interval. This provides real-time and clear information about the liquid level, thereby improving the functionality of liquid level measurement.

[0066] Furthermore, based on the first embodiment of this application described above, a second embodiment of the laser liquid level measurement circuit of this application is proposed, referring to... Figure 2 , Figure 2 This is a schematic diagram of the environmental monitoring unit in the laser liquid level measurement circuit of this application. The environmental monitoring unit 10 includes:

[0067] Concentration detector 11 is located at the top center of the sealed liquid tank 200. Concentration detector 11 is set to output a high level when the concentration value is greater than a preset concentration threshold and output a low level when the concentration value is less than or equal to the preset concentration threshold.

[0068] Voltage selector 12, the control terminal of voltage selector 12 is connected to concentration detector 11, the first input terminal of voltage selector 12 is connected to first voltage source 310, the second input terminal of voltage selector 12 is connected to second voltage source 320, and the output terminal of voltage selector 12 is connected to the power supply terminal of first measurement unit 20 and second measurement unit 30.

[0069] In this embodiment, the environmental monitoring unit 10 includes a concentration detector 11 and a voltage selector 12. The concentration detector 11 can be adapted to the liquid in the sealed liquid tank 200. For example, if the liquid in the sealed liquid tank 200 is concentrated sulfuric acid, the concentration detector corresponding to concentrated sulfuric acid will be selected. In this case, it is only necessary to define that the concentration detector 11 outputs a high level when the concentration value of the concentrated sulfuric acid is greater than a preset concentration threshold, and outputs a low level when the concentration value is less than or equal to the preset concentration threshold. This is the principle of using a common concentration detector to implement an alarm when detecting concentration, except that the alarm is controlled by outputting a high level, and vice versa. The voltage selector 12 is connected to the power supply terminal of the first measurement unit 20 and the power supply terminal of the second measurement unit 30 through the high and low level control, and connected to the second voltage source 320 or the first voltage source 310. The two voltage sources have different output voltage values, and thus different lasers are emitted under different voltage control to adapt to different environments, that is, to overcome the influence of excessively high concentration on the detection accuracy. If the concentration is too high, the voltage selector 12 is controlled by a high level to connect the first input terminal of the voltage selector 12 to the output terminal of the voltage selector 12, and select the larger first voltage source 310 (conversely, the lower second voltage source 320 can be used normally). Since the laser power and voltage are positively correlated, the voltage can be increased to increase the laser power, thereby improving the accuracy of laser ranging in a high-concentration space.

[0070] In one embodiment, the liquid level measurement and control unit 40 includes:

[0071] A flight timer is connected to the measurement controller 41 in the liquid level measurement control unit 40. The flight timer is used to determine the interval duration.

[0072] In this embodiment, a flight timer collects the time from laser emission to reception, and then uses this time as the interval. The flight timer can be a commonly used timer for collecting flight time. Alternatively, a time-to-digital converter can be used to replace the traditional timing circuit, achieving picosecond-level time resolution and improving the accuracy of flight time measurement. Of course, the actual timer can be adaptively selected according to the actual situation, and is not limited here.

[0073] Furthermore, based on the first and / or second embodiments of this application described above, a third embodiment of the laser liquid level measurement circuit of this application is proposed, with reference to... Figure 3 , Figure 3 This is a schematic diagram of a frame of the measuring unit in the laser liquid level measuring circuit of this application. The first position at the top inside the sealed liquid tank 200 includes a first transmitting position and a first receiving position. The first measuring unit 20 includes:

[0074] The first laser 21 is movably attached to the first emission position. The power supply terminal of the first laser 21 is connected to the voltage selector 12 in the environmental monitoring unit 10. The movable attachment includes the middle position of the first laser 21 being obliquely fixed to the first emission position, and the first laser 21 being able to move up and down.

[0075] The first direction adjustment subunit 22 has a first adjustment end that is mechanically connected to the active control end of the first laser 21, and a control end that is connected to the liquid level measurement and control unit 40.

[0076] The first photosensitive element 23 is movably attached to the first receiving position. The active control end of the first photosensitive element 23 is mechanically connected to the second adjustment end of the first direction adjustment subunit 22. The output end of the first photosensitive element 23 is connected to the liquid level measurement and control unit 40.

[0077] In one embodiment, the second position at the top within the sealed liquid tank 200 includes a second transmitting position and a second receiving position, wherein the second transmitting position is a symmetrical position to the second receiving position, and the first receiving position is a symmetrical position to the first transmitting position. The second measuring unit 30 includes:

[0078] The second laser 31 is movably attached to the second emission position. The power supply terminal of the second laser 31 is connected to the voltage selector 12 in the environmental monitoring unit 10. The movable attachment includes the middle position of the second laser 31 being obliquely fixed to the second emission position, and the second laser 31 being able to move up and down.

[0079] The second direction adjustment subunit 32 has a first adjustment end that is mechanically connected to the active control end of the second laser 31, and a control end that is connected to the liquid level measurement and control unit 40.

[0080] The second photosensitive element 33 is movably attached to the second receiving position. The active control end of the second photosensitive element 33 is mechanically connected to the second adjustment end of the second direction adjustment subunit 32. The output end of the second photosensitive element 33 is connected to the liquid level measurement and control unit 40.

[0081] In this embodiment, the first measurement unit 20 includes a first laser 21 and a first photosensitive element 23, as well as a first direction adjustment subunit 22 for adjusting the first laser 21 (movably attached to the first emitting position) and the first photosensitive element 23 (movably attached to the first receiving position). The second measurement unit 30 includes a second laser 31 (movably attached to the second emitting position) and a second photosensitive element 33 (movably attached to the first receiving position), as well as a second direction adjustment subunit 32 for adjusting the second laser 31 and the second photosensitive element 33. The second emitting position is symmetrical to the second receiving position, and the first receiving position is symmetrical to the first emitting position, ensuring that the two sets of receiving and emitting are in symmetrical positions. This reduces the complexity of device adjustment; that is, directly and synchronously adjusting the first laser 21 and the second photosensitive element 33, or the second laser 31 and the first photosensitive element 23, can directly achieve laser reflection and incidence. Because the first measurement unit 20 and the second measurement unit 30 have the same composition and connection structure (the device selection, control, and connection methods are also the same), the following description will refer to the first measurement unit 20. The first laser 21 can be a semiconductor laser (such as a side-emitting laser), a fiber laser, etc., and can emit pulsed light (for time-of-flight methods) or continuous waves (for phase measurement methods). The first laser 21 is connected to the first driving circuit, which drives the first laser 21 to emit laser light. The first driving circuit can be a commonly used constant current source driver, a pulse modulation circuit, and an emitting optical element located on the side of the first laser 21 that emits laser light. It can be a collimating lens to shape the laser beam into parallel light and expand the measurement range, or a beam expander to increase the spot diameter, reduce the energy density per unit area, and prevent liquid surface ablation. The first photosensitive element 23 can be a photodetector, such as an avalanche photodiode, a photodiode, or a position-sensitive detector, used to convert the received optical signal into an electrical signal. It also includes a signal processing circuit connected to the first photosensitive element 23, including an amplifier connected in sequence to amplify weak electrical signals, a filter to remove noise and extract effective signals, an analog-to-digital converter to convert analog signals into digital signals for microprocessor processing (i.e., a controller in the liquid level measurement and control unit 40 that calculates distances), and a receiving optical element. It is worth noting that a focusing lens can also be provided on the outside of the first photosensitive element 23 to focus the reflected light onto the detector, and a narrow-band filter to allow only specific wavelength laser light to pass through, suppressing ambient light interference, thereby completing the laser emission and reception. Since the second measurement unit 30 is the same as the first measurement unit 20, the second measurement unit 30 can also have the above composition and connection relationship, which will not be repeated here.

[0082] Furthermore, based on the first, second, and / or third embodiments of this application described above, a fourth embodiment of the laser liquid level measurement circuit of this application is proposed, with reference to... Figure 4 , Figure 4This is a schematic diagram of a liquid level measurement control unit in the laser liquid level measurement circuit of this application. The first direction adjustment subunit 22 includes:

[0083] The first fixed gear 221 is fixed to the movable control end of the first laser 21, and the control end of the first fixed gear 221 is connected to the liquid level measurement and control unit 40.

[0084] The second fixed gear 222 is fixed to the movable control end of the first photosensitive element 23, and the control end of the second fixed gear 222 is connected to the liquid level measurement and control unit 40.

[0085] The second direction adjustment subunit 32 includes:

[0086] The third fixed gear 321 is fixed to the movable control end of the second laser 31, and the control end of the third fixed gear 321 is connected to the liquid level measurement and control unit 40.

[0087] The fourth fixed gear 322 is fixed to the movable control end of the second photosensitive element 33, and the control end of the fourth fixed gear 322 is connected to the liquid level measurement and control unit 40.

[0088] In one embodiment, the liquid level measurement and control unit 40 includes:

[0089] Measurement controller 41, which includes a first steering control terminal and a second steering control terminal;

[0090] The first synchronous motor 42 has its output end connected to the control end of the first fixed gear 221, and its control end is connected to the first steering control end.

[0091] The output end of the second synchronous motor 43 is connected to the control end of the second fixed gear 222, and the control end of the second synchronous motor 43 is connected to the second steering control end.

[0092] The third synchronous motor 44 has its output end connected to the control end of the third fixed gear 321, and its control end is connected to the first steering control end.

[0093] The fourth synchronous motor 45 has its output end connected to the control end of the fourth fixed gear 322, and its control end is connected to the second steering control end.

[0094] In this embodiment, the first direction adjustment subunit 22 includes a first fixed gear 221 fixed to the movable control end of the first laser 21 and a second fixed gear 222 fixed to the movable control end of the first photosensitive element 23. The second direction adjustment subunit 32 includes a third fixed gear 321 fixed to the movable control end of the second laser 31 and a fourth fixed gear 322 fixed to the movable control end of the second photosensitive element 33. The first direction adjustment subunit 22 will continue to be described here. The composition and control principle of the second direction adjustment subunit 32 are the same as those of the first direction adjustment subunit 22, and will not be repeated here. The fixed position (generally the middle position) of the first laser 21 is connected by the fixing structure 103. The fixing structure 103 only provides tension and does not fix the first laser 21. At this time, a first fixing gear 221 can be set at the tail of the first laser 21, and the first laser 21 can be moved up and down by rotating the first fixing gear 221. Of course, a retractable extension rod can also be set at the tail of the first laser 21, and the first laser 21 can be moved up and down by extending and retracting the rod. That is to say, the first photosensitive element 23, the second laser 31 and the second photosensitive element 33 are all controlled by the principle of up and down movement. At this point, multiple motors can be installed in the liquid level measurement and control unit 40. The rotation of these motors moves the first laser 21, the first photosensitive element 23, the second laser 31, and the second photosensitive element 33 vertically. To ensure synchronous adjustment of the first laser 21 and the second photosensitive element 33, or the second laser 31 and the first photosensitive element 23, synchronous control is achieved using either the first synchronous motor 42 connected to the first laser 21, the fourth synchronous motor 45 connected to the second photosensitive element 33, or the third synchronous motor 44 connected to the second laser 31 and the second synchronous motor 43 connected to the first photosensitive element 23. By connecting every two motors to the same control terminal for synchronous control, rapid adjustment can be achieved, improving the efficiency of liquid level measurement. Further details can be found in [reference needed]. Figure 5 , Figure 5 This is a schematic diagram of the installation of the laser liquid level measurement circuit of this application. The first synchronous motor 42, which connects to the first laser 21, and the fourth synchronous motor 45, which connects to the second photosensitive element 33, are positioned in the sealed liquid tank 200, thereby enabling rapid synchronous adjustment for quick liquid level measurement. It is worth noting that the synchronous motors can be installed within the two measurement units, or they can be installed on the outside of the sealed liquid tank 200 through a through-hole, depending on the actual situation; this is not limited here.

[0095] Furthermore, based on the first, second, third, and / or fourth embodiments of this application described above, a fifth embodiment of the laser liquid level measurement circuit of this application is proposed. The measurement controller 41 further includes a working control terminal, and the liquid level measurement control unit 40 includes:

[0096] The mode selector 46 has its control terminal connected to the working control terminal, its input terminal connected to the voltage selector 12 in the environmental monitoring unit 10, its first output terminal connected to the power supply terminal of the first laser 21, and its second output terminal connected to the power supply terminal of the second laser 31.

[0097] In this embodiment, the liquid level measurement and control unit 40 also includes a mode selector 46, which can select the first measurement unit 20 and the second measurement unit 30, that is, select which unit of the first measurement unit 20 and the second measurement unit 30 is responsible for emitting laser and which unit is responsible for receiving laser. If it is found that the laser emission effect in the first measurement unit 20 is not good (the laser reception effect was poor in the last measurement or the control logic is complicated due to internal factors), the mode selector 46 will select to supply power to the power supply terminal of the second laser 31 so that the second laser 31 emits laser, as controlled by the working control terminal 10 (1 is high and 0 is low). Conversely, the power supply terminal of the first laser 21 will be supplied so that the first laser 21 emits laser, as controlled by the working control terminal 01. It is worth noting that two lasers may be needed for addressing when searching for liquid level. Therefore, if the working control terminal 11 controls the level, power is supplied to the power terminals of the first laser 21 and the second laser 31, and then the two lasers are used to search for liquid level from top to bottom and from bottom to top respectively, which can greatly improve the efficiency of finding liquid level.

[0098] This application also provides a laser liquid level measuring device, which includes the laser liquid level measuring circuit described above.

[0099] It is worth noting that the laser liquid level measuring device, including the aforementioned laser liquid level measuring circuit, is located at the top of the sealed liquid tank. A first measuring unit is obliquely attached to the top of the sealed liquid tank at a first position, and a second measuring unit is obliquely attached to the top of the sealed liquid tank at a second position (the second position is symmetrical to the first position). This allows the device to collect and control the interval between the first measuring unit emitting laser light and the second measuring unit receiving it; or, collect and control the interval between the second measuring unit emitting laser light and the first measuring unit receiving it. Based on this interval, the liquid level in the sealed liquid tank is determined. This avoids the phenomenon where sensor measurements can only measure levels exceeding a predefined level (i.e., it can only know whether the liquid level exceeds a predefined level, but cannot specify the actual value). This laser liquid level measuring circuit, by collecting and controlling the interval between the first measuring unit emitting laser light and the second measuring unit receiving it, or, collecting and controlling the second measuring unit emitting laser light and the first measuring unit receiving it, determines the liquid level in the sealed liquid tank based on the interval, providing real-time and clear information about the liquid level, thus improving the functionality of the liquid level measurement.

[0100] In one embodiment, reference is made to Figure 6 , Figure 6 This is a schematic diagram of a first embodiment of the laser liquid level measuring device of this application. The laser liquid level measuring device includes:

[0101] The first packaging box 60 is used to encapsulate the first measuring unit 20 in the laser liquid level measuring circuit. The first laser 21 in the first measuring unit 20 is disposed at the first opening 61 of the first packaging box 60, and the first photosensitive element 23 in the first measuring unit 20 is disposed at the second opening 62 of the first packaging box 60. The first opening 61 is an oblique opening, and a first arc-shaped protective structure 63 is provided on the lower edge of the first opening 61.

[0102] The second packaging box 70 is used to encapsulate the second measuring unit 30 in the laser liquid level measuring circuit. The second laser 31 in the second measuring unit 30 is located at the third opening 71 of the second packaging box 70, and the second photosensitive element 33 in the second measuring unit 30 is located at the fourth opening 72 of the second packaging box 70. The third opening 71 is an oblique opening, and a second arc-shaped protective structure 73 is provided on the lower edge of the third opening 71. The liquid level measuring control unit 40 in the laser liquid level measuring circuit is separately disposed in the first packaging box 60 and the second packaging box 70.

[0103] In this embodiment, to ensure the protection of the components in the first measuring unit 20 and the second measuring unit 30, the first measuring unit 20 and the second measuring unit 30 can be respectively set in the corresponding first packaging box 60 and the second packaging box 70. Then, the packaging box is provided with an oblique opening to realize the emission and reception of laser. At the same time, the oblique opening can avoid the direct impact of corrosive liquid (i.e., the vertical downward setting is easily directly contacted by corrosive gas), which can greatly improve the service life of the components. Meanwhile, the liquid level measurement control unit 40 in the laser liquid level measurement circuit is separately set in the first packaging box 60 and the second packaging box 70. Alternatively, other setting methods can be used, such as directly selecting a more distant and safer position through a gear connection structure. It is worth noting that a second arc-shaped protective structure 73 and a first arc-shaped protective structure 63 are also provided at the opening of the laser (which also facilitates the liquefaction and flow of gas) to avoid corrosion and damage from gases in the air. In particular, it can effectively protect the laser when it evaporates at high temperatures. The arc-shaped protective structure can be made of sapphire or quartz, which is resistant to high temperatures and corrosion, and protects the internal optical components. Because the opening is angled, it will not affect the normal emission of the laser, thus greatly improving the service life of the entire laser equipment.

[0104] It is worth noting that other hardware may also be included in the laser liquid level measuring device, which will not be described in detail here. The entire laser liquid level measuring circuit can be set in the laser liquid level measuring device or in other products, which is not limited here.

[0105] The device provided in this application can solve the technical problem of low functionality in liquid level measurement. Compared with the prior art, the beneficial effects of the laser liquid level measuring device provided in this application are the same as those of the laser liquid level measuring circuit provided in the above embodiments, and will not be repeated here.

[0106] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A laser liquid level measurement circuit, characterized in that, The laser liquid level measurement circuit is located at the top of the sealed liquid tank, and the laser liquid level measurement circuit includes: An environmental monitoring unit is located at the top center of the sealed liquid tank. A first measuring unit is obliquely attached to a first position on the top of the sealed liquid tank, and the power supply terminal of the first measuring unit is connected to the environmental monitoring unit. The second measuring unit is obliquely attached to the top of the sealed liquid tank at a second position. The power supply terminal of the second measuring unit is connected to the environmental monitoring unit. The second position is a symmetrical position to the first position. A liquid level measurement and control unit is connected to the environmental monitoring unit, the control terminal of the first measurement unit, and the control terminal of the second measurement unit. The liquid level measurement and control unit is used to collect the interval between controlling the first measurement unit to emit a laser and the second measurement unit to receive the laser; or, to collect the interval between controlling the second measurement unit to emit a laser and the first measurement unit to receive the laser, so as to determine the liquid level of the sealed liquid tank based on the interval.

2. The laser liquid level measurement circuit as described in claim 1, characterized in that, The environmental monitoring unit includes: A concentration detector is located at the top center of the sealed liquid tank. The concentration detector is configured to output a high level when the concentration value is greater than a preset concentration threshold, and output a low level when the concentration value is less than or equal to the preset concentration threshold. A voltage selector, wherein the control terminal of the voltage selector is connected to the concentration detector, the first input terminal of the voltage selector is connected to a first voltage source, the second input terminal of the voltage selector is connected to a second voltage source, and the output terminal of the voltage selector is connected to the power supply terminals of the first measurement unit and the second measurement unit.

3. The laser liquid level measurement circuit as described in claim 1, characterized in that, The first position at the top of the sealed liquid tank includes a first launching position and a first receiving position, and the first measuring unit includes: A first laser is movably attached to the first emission position. The power supply terminal of the first laser is connected to a voltage selector in the environmental monitoring unit. The movable attachment includes the middle position of the first laser being obliquely fixed to the first emission position, and the first laser being able to move up and down. A first direction adjustment subunit, wherein the first adjustment end of the first direction adjustment subunit is mechanically connected to the active control end of the first laser, and the control end of the first direction adjustment subunit is connected to the liquid level measurement and control unit; A first photosensitive element is movably attached to the first receiving position. The active control end of the first photosensitive element is mechanically connected to the second adjustment end of the first direction adjustment subunit. The output end of the first photosensitive element is connected to the liquid level measurement and control unit.

4. The laser liquid level measurement circuit as described in claim 3, characterized in that, The second position at the top of the sealed liquid tank includes a second transmitting position and a second receiving position, wherein the second transmitting position is a symmetrical position to the second receiving position, and the first transmitting position is a symmetrical position to the first receiving position. The second measuring unit includes: A second laser is movably attached to the second emission position. The power supply terminal of the second laser is connected to the voltage selector in the environmental monitoring unit. The movable attachment includes the middle position of the second laser being obliquely fixed to the second emission position, and the second laser being able to move up and down. The second direction adjustment subunit has a first adjustment end that is mechanically connected to the active control end of the second laser, and a control end that is connected to the liquid level measurement and control unit. The second photosensitive element is movably attached to the second receiving position. The active control end of the second photosensitive element is mechanically connected to the second adjustment end of the second direction adjustment subunit. The output end of the second photosensitive element is connected to the liquid level measurement and control unit.

5. The laser liquid level measurement circuit as described in claim 4, characterized in that, The first direction adjustment subunit includes: A first fixed gear is fixed to the movable control end of the first laser, and the control end of the first fixed gear is connected to the liquid level measurement and control unit. The second fixed gear is fixed to the movable control end of the first photosensitive element, and the control end of the second fixed gear is connected to the liquid level measurement and control unit. The second direction adjustment subunit includes: The third fixed gear is fixed to the movable control end of the second laser, and the control end of the third fixed gear is connected to the liquid level measurement and control unit; A fourth fixed gear is fixed to the movable control end of the second photosensitive element, and the control end of the fourth fixed gear is connected to the liquid level measurement and control unit.

6. The laser liquid level measurement circuit as described in claim 5, characterized in that, The liquid level measurement and control unit includes: A measurement controller, the measurement controller including a first steering control terminal and a second steering control terminal; A first synchronous motor, the output end of which is connected to the control end of the first fixed gear, and the control end of which is connected to the first steering control end; The second synchronous motor has its output end connected to the control end of the second fixed gear, and its control end is connected to the second steering control end. The third synchronous motor, the output end of which is connected to the control end of the third fixed gear, and the control end of the third synchronous motor is connected to the first steering control end; The fourth synchronous motor has its output end connected to the control end of the fourth fixed gear, and its control end is connected to the second steering control end.

7. The laser liquid level measurement circuit as described in claim 6, characterized in that, The measurement controller also includes a working control terminal, and the liquid level measurement control unit includes: A mode selector, wherein the control terminal of the mode selector is connected to the working control terminal, the input terminal of the mode selector is connected to the voltage selector in the environmental monitoring unit, the first output terminal of the mode selector is connected to the power supply terminal of the first laser, and the second output terminal of the mode selector is connected to the power supply terminal of the second laser.

8. The laser liquid level measurement circuit according to any one of claims 1 to 7, characterized in that, The liquid level measurement and control unit includes: A flight timer, connected to a measurement controller in the liquid level measurement control unit, is used to determine the interval duration.

9. A laser liquid level measuring device, characterized in that, The laser liquid level measuring device includes the laser liquid level measuring circuit as described in any one of claims 1 to 8.

10. The laser liquid level measuring device as described in claim 9, characterized in that, The laser liquid level measuring device includes: The first packaging box is used to encapsulate the first measuring unit in the laser liquid level measuring circuit. The first laser in the first measuring unit is disposed at the first opening of the first packaging box, and the first photosensitive element in the first measuring unit is disposed at the second opening of the first packaging box. The first opening is an oblique opening, and a first arc-shaped protective structure is provided on the lower edge of the first opening. The second packaging box is used to encapsulate the second measuring unit in the laser liquid level measuring circuit. The second laser in the second measuring unit is disposed at the third opening of the second packaging box, and the second photosensitive element in the second measuring unit is disposed at the fourth opening of the second packaging box. The third opening is an oblique opening, and a second arc-shaped protective structure is provided on the lower edge of the third opening. The liquid level measuring and control unit in the laser liquid level measuring circuit is separately disposed in the first packaging box and the second packaging box.

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