A method and device for measuring liquid level at a stratified interface in a stratified liquid

Abstract

The invention discloses a liquid level measurement method and device for a stratified interface in a stratified liquid, and relates to the field of liquid level measurement. The liquid level measurement method comprises: controlling light sources to be turned on and off one by one, obtaining the light intensity value of a corresponding light detector when each light source is turned on, and the light intensity value of a light detector located at an adjacent position above and below the light detector as an adjacent light intensity value; obtaining the difference in light intensity values ​​between adjacent positions of light detectors corresponding to each light source, and obtaining a first interface liquid level value through the difference; obtaining a second interface liquid level value according to the adjacent difference; obtaining a third interface liquid level value according to the difference in light intensity value of the corresponding light detector and the adjacent light intensity value below the light detector; obtaining a fourth interface liquid level value according to the pressure at each preset liquid level; and obtaining a target interface liquid level value according to the above-mentioned interface liquid level values ​​using preset weights, thereby solving the problem that the current liquid density difference between the upper and lower layers of liquid is very small or the properties of the two liquids are similar, which leads to inaccurate measurement.

Description

Technical Field

[0001] The invention relates to the field of liquid level measurement, and in particular to a method and device for measuring the liquid level of a stratified interface in a stratified liquid. Background Art

[0002] The interface measurement of two stratified liquids with different densities is very important in chemical and water treatment production. The existing measurement methods are:

[0003] Magnetic floating interface level gauge: Find a float whose density is between the density of the upper and lower layers of liquid. The float can float on the interface. The disadvantage is that the density difference between the upper and lower layers of liquid is very small. This kind of float is difficult to find, or it is unreliable and often misreports. It has been basically eliminated at present.

[0004] Radar interface level meter: Use radar waves reflected from the interface to identify the interface. This method requires that the dielectric constants of the upper and lower layers of liquid differ greatly. After installation, the reflected clutter must be filtered out on site, and there are many false alarms. This method also requires a relatively large investment;

[0005] Differential pressure interface level gauge: When the height of two liquids changes, pressure sensors installed at different heights measure the pressure and solve the equation to get the interface level. This method requires a large difference in density between the upper and lower layers, otherwise the accuracy is poor and unreliable;

[0006] Capacitance interface level meter, radio frequency admittance interface level meter: a method of measuring by using the change in capacitance or admittance when the medium composition changes. This method measures according to its working principle. Since the two liquids have similar properties in most cases, the measurement results are not accurate enough, so it cannot work properly in all media. Summary of the invention

[0007] In order to solve the problems of inaccurate measurement and high measurement cost caused by extremely small difference in density between the upper and lower liquids or similar properties of the two liquids in the current interface measurement method of two stratified liquids with different densities, the present invention proposes a liquid level measurement method for the stratified interface in stratified liquids.

[0008] The liquid level value of the layered interface is obtained by tilting a light source set at a plurality of preset liquid levels and a light detector set directly opposite the light source. The liquid level measurement method comprises the following steps:

[0009] S01: Control the light sources to turn on and off one by one, obtain the light intensity value of the corresponding light detector when each light source is turned on, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector as the adjacent light intensity value, wherein the adjacent light intensity value includes the upper adjacent light intensity value and the lower adjacent light intensity value;

[0010] S02: Obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference;

[0011] S03: obtaining the adjacent position difference between the upper adjacent position light intensity value and the lower adjacent position light intensity value of each light detector when each light source is turned on, and obtaining the second interface liquid level value according to the adjacent position difference;

[0012] S04: obtaining the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtaining the third interface liquid level value according to the difference;

[0013] S05: obtaining the pressure at each preset liquid level, and obtaining the pressure difference between adjacent preset liquid levels, obtaining the target pressure according to the difference, and obtaining the fourth interface liquid level value according to the target pressure;

[0014] S06: performing weighted calculation according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value using preset weights to obtain a target interface liquid level value.

[0015] Furthermore, the step S02 is specifically as follows:

[0016] The difference in light intensity between adjacent positions of light detectors corresponding to each light source is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the first interface liquid level value.

[0017] Furthermore, the step S03 is specifically as follows:

[0018] Obtain the adjacent difference between the upper adjacent light intensity value and the lower adjacent light intensity value of each light detector when each light source is turned on, obtain the vertical setting distance between the two light detectors corresponding to the adjacent difference with the largest value, and obtain the average value as the second interface liquid level value.

[0019] Furthermore, the step S04 is specifically as follows:

[0020] When each light source is turned on, the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the third interface liquid level value.

[0021] The present invention also proposes a liquid level measuring device for a stratified interface in a stratified liquid, comprising: a processor, pressure sensors arranged at a plurality of preset liquid levels, a plurality of light sources and light detectors arranged corresponding thereto; wherein:

[0022] A pressure sensor, used to obtain the pressure at each preset liquid level;

[0023] A light source is tilted and arranged at a plurality of preset liquid levels to emit light in sequence;

[0024] A light detector, used to obtain the light intensity value of the corresponding light detector when each light source is turned on one by one under a lightless condition, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector is an adjacent light intensity value, wherein the adjacent light intensity value includes an upper adjacent light intensity value and a lower adjacent light intensity value;

[0025] A processor comprising:

[0026] A first processing module is used to obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference;

[0027] A second processing module is used to obtain an adjacent position difference between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on, and obtain a second interface liquid level value according to the adjacent position difference;

[0028] A third processing module is used to obtain the difference between the light intensity value of the light detector corresponding to each light source and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtain the third interface liquid level value according to the difference;

[0029] A fourth processing module, used to obtain the pressure difference between adjacent preset liquid levels, obtain the target pressure according to the difference, and obtain the fourth interface liquid level value according to the target pressure;

[0030] The fifth processing module is used to obtain a target interface liquid level value by performing weighted calculation using preset weights according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value.

[0031] Furthermore, the first processing module specifically includes:

[0032] A difference acquisition unit, used to acquire the difference in light intensity between adjacent positions of light detectors corresponding to each light source;

[0033] The first interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the maximum difference value, and acquire the average value thereof as the first interface liquid level value.

[0034] Furthermore, the second processing module specifically includes:

[0035] An adjacent position difference value acquisition unit is used to acquire an adjacent position difference value between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on;

[0036] The second interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the adjacent position difference with the largest value, and acquire the average value thereof as the second interface liquid level value.

[0037] Furthermore, the fourth processing module specifically includes:

[0038] A pressure difference acquisition unit, used to acquire the pressure difference between adjacent preset liquid levels;

[0039] The fourth interface liquid level value acquisition unit is used to acquire the pressure difference with the largest value, and acquire the average value of two pressures corresponding to the pressure difference, and acquire the fourth interface liquid level value according to the average value.

[0040] Compared with the prior art, the present invention has at least the following beneficial effects:

[0041] (1) The present invention controls the light sources to turn on and off one by one, obtains the light intensity value of the light detector corresponding to each light source when it is turned on, and obtains the first interface liquid level value through the difference of the light intensity values ​​between the adjacent positions of the light detectors corresponding to each light source. The difference of the light intensity values ​​between the adjacent positions of the light detectors corresponding to each light source reflects the degree of change of absorbance in the liquid. The greater the difference, the greater the change of absorbance. The first interface liquid level value can be obtained through the change (difference) of absorbance;

[0042] (2) The present invention obtains the adjacent position difference between the upper adjacent position light intensity value and the lower adjacent position light intensity value of each light detector when each light source is turned on, and obtains the second interface liquid level value according to the adjacent position difference; the adjacent position difference reflects the turbidity of the liquid. When the light source irradiates the sludge particles in the sludge layer, scattering occurs, and the light is received by the upper and lower light detectors. In the sludge layer, the turbidity is relatively high, and in the clear layer, the turbidity is relatively low. Therefore, the larger the adjacent position difference, the greater the turbidity difference at the positions of the two light detectors. Therefore, the second interface liquid level value can be obtained through the change in turbidity (adjacent position difference);

[0043] (3) The present invention obtains the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtains the third interface liquid level value according to the difference; the difference reflects that when the light source irradiates the interface and the light is reflected and refracted, the change of its light intensity will increase, so the third interface liquid level value can be obtained through the difference;

[0044] (4) The present invention also includes: obtaining the pressure at each preset liquid level and the pressure difference between adjacent preset liquid levels, and obtaining the average of the two pressures corresponding to the pressure difference with the largest value, obtaining the fourth interface liquid level value according to the average value, and finally obtaining the target interface liquid level value by weighted calculation based on the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value using preset weights. It obtains each interface liquid level value through multiple methods and performs weighted calculation on them, which solves the problem of inaccurate measurement caused by the extremely small difference in density of the upper and lower layers of liquid or the similar properties of the two liquids in the current measurement method, and further improves the measurement accuracy of the layered interface liquid level value. The measurement method is simple and easy to implement, which reduces the measurement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A method flow chart of a method for measuring the liquid level of a stratified interface in a stratified liquid;

[0046] Figure 2 The present invention is a structural diagram of a device for measuring the liquid level at a layered interface in a layered liquid.

[0047] In the figure:

[0048] 1. Light source; 2. Light detector; 3. High-density liquid; 4. Target interface liquid level; 5. Low-density liquid; 6. Container; 7. Pressure sensor; 8. Processor. DETAILED DESCRIPTION

[0049] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0050] Embodiment 1

[0051] In order to solve the problem of inaccurate measurement and high measurement cost in the current interface measurement method of two layered liquids with different densities, when the density difference between the upper and lower liquids is very small or the properties of the two liquids are similar, such as Figure 1 As shown, the present invention proposes a method for measuring the liquid level of a stratified interface in a stratified liquid, which obtains the liquid level value of the stratified interface by tilting a light source set at a plurality of preset liquid levels and a light detector set directly opposite the light source. The liquid level measurement method comprises the steps of:

[0052] S01: Control the light sources to turn on and off one by one, obtain the light intensity value of the corresponding light detector when each light source is turned on, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector as the adjacent light intensity value, wherein the adjacent light intensity value includes the upper adjacent light intensity value and the lower adjacent light intensity value;

[0053] S02: Obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference;

[0054] S03: obtaining the adjacent position difference between the upper adjacent position light intensity value and the lower adjacent position light intensity value of each light detector when each light source is turned on, and obtaining the second interface liquid level value according to the adjacent position difference;

[0055] S04: obtaining the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtaining the third interface liquid level value according to the difference;

[0056] S05: obtaining the pressure at each preset liquid level, and obtaining the pressure difference between adjacent preset liquid levels, obtaining the target pressure according to the difference, and obtaining the fourth interface liquid level value according to the target pressure;

[0057] S06: performing weighted calculation according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value using preset weights to obtain a target interface liquid level value.

[0058] It should be noted that:

[0059] The present invention controls the light sources to be turned on and off one by one, obtains the light intensity value of the light detector corresponding to each light source when it is turned on, and obtains the first interface liquid level value through the difference of the light intensity values ​​between the adjacent positions of the light detectors corresponding to each light source. The difference of the light intensity values ​​between the adjacent positions of the light detectors corresponding to each light source reflects the degree of change of absorbance in the liquid. The greater the difference, the greater the change of absorbance. The first interface liquid level value can be obtained through the change (difference) of absorbance.

[0060] The present invention obtains the orthogonal difference between the upper orthogonal light intensity value and the lower orthogonal light intensity value of each light detector when each light source is turned on, and obtains the second interface liquid level value according to the orthogonal difference; the orthogonal difference reflects the turbidity of the liquid. When the light source irradiates the sludge particles in the sludge layer, scattering occurs, and the light is received by the upper and lower light detectors. In the sludge layer, the turbidity is relatively high, and in the clear layer, the turbidity is relatively low. Therefore, the larger the orthogonal difference, the greater the turbidity difference at the positions of the two light detectors. Therefore, the second interface liquid level value can be obtained through the change of turbidity (orthogonal difference);

[0061] The present invention obtains the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtains the third interface liquid level value according to the difference; the difference reflects that when the light source irradiates the interface and the light is reflected and refracted, the change of its light intensity will increase, so the third interface liquid level value can be obtained through the difference;

[0062] The first to fourth interface level values ​​obtained by the above method are weighted calculated by the present invention using preset weights to obtain the target interface level value; for example, in the mud-water interface, turbidity and absorbance reflect the interface position of the stratification more reliably, and the first interface level value and the second interface level value can be given a relatively large weight in the calculation; and for the interface with clear stratification, the refractive index reflects the interface position more reliably, and the third interface level value can be given a larger weight in the calculation; if the upper and lower layers of the liquid have a relatively large difference in density, the pressure calculation reflects the interface position more reliably, and the fourth interface level value can be given a slightly larger weight in the calculation. Thus, the preset weights are used for weighted calculation to obtain the target interface level value, which improves the flexibility of the calculation and further improves the measurement accuracy.

[0063] It should be noted that the light source in the present invention adopts a laser light emitting diode, and the light detector adopts an OPT3001 optical digital sensor, which has low cost and solves the problem of high cost in the existing measurement method.

[0064] The step S02 is specifically as follows:

[0065] The difference in light intensity between adjacent positions of light detectors corresponding to each light source is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the first interface liquid level value.

[0066] For example, light sources are set at the following depths: 10cm; 20cm; 30cm; 40cm; 50cm; the light detector directly opposite the light source receives the light signal. Assuming that the pressure (absorbance) difference between 30cm and 40cm is the largest, it means that the first interface liquid level is at 35cm.

[0067] It should be noted that the two light detectors corresponding to the difference are light detectors corresponding to the minuend (ie, the subtracted light intensity value) and the subtrahend (ie, the subtrahend light intensity value).

[0068] The step S03 is specifically as follows:

[0069] Obtain the adjacent difference between the upper adjacent light intensity value and the lower adjacent light intensity value of each light detector when each light source is turned on, obtain the vertical setting distance between the two light detectors corresponding to the adjacent difference with the largest value, and obtain the average value as the second interface liquid level value.

[0070] In this embodiment, the two photodetectors corresponding to the adjacent position difference values ​​are photodetectors corresponding to the minuend and the subtrahend of the adjacent position difference values.

[0071] The step S04 is specifically as follows:

[0072] When each light source is turned on, the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the third interface liquid level value.

[0073] The present invention uses preset weights to perform weighted calculation based on the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value to obtain the target interface liquid level value. It obtains the interface liquid level values ​​through multiple methods and performs weighted calculations on them, which solves the problem of inaccurate measurement caused by extremely small density difference between the upper and lower layers of liquid or similar properties of the two liquids in the current measurement method, and further improves the measurement accuracy of the layered interface liquid level value. The measurement method is simple and easy to implement, and reduces the measurement cost.

[0074] Embodiment 2

[0075] like Figure 2 As shown, the present invention also proposes a liquid level measuring device for a stratified interface in a stratified liquid, comprising: a processor, pressure sensors arranged at a plurality of preset liquid levels, a plurality of light sources and light detectors arranged corresponding thereto; wherein:

[0076] A pressure sensor, used to obtain the pressure at each preset liquid level;

[0077] A light source is tilted and arranged at a plurality of preset liquid levels to emit light in sequence;

[0078] A light detector, used to obtain the light intensity value of the corresponding light detector when each light source is turned on one by one under a lightless condition, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector is an adjacent light intensity value, wherein the adjacent light intensity value includes an upper adjacent light intensity value and a lower adjacent light intensity value;

[0079] A processor comprising:

[0080] A first processing module is used to obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference;

[0081] A second processing module is used to obtain an adjacent position difference between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on, and obtain a second interface liquid level value according to the adjacent position difference;

[0082] A third processing module is used to obtain the difference between the light intensity value of the light detector corresponding to each light source and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtain the third interface liquid level value according to the difference;

[0083] A fourth processing module, used to obtain the pressure difference between adjacent preset liquid levels, obtain the target pressure according to the difference, and obtain the fourth interface liquid level value according to the target pressure;

[0084] The fifth processing module is used to obtain a target interface liquid level value by performing weighted calculation using preset weights according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value.

[0085] like Figure 2 As shown, a high-density liquid and a low-density liquid are contained in a container, and a target interface liquid level is formed after clarification. A light source is tilted at several preset liquid levels (different depths), and a light detector is correspondingly arranged for the light source. Pressure sensors are also arranged at the different depths.

[0086] The first processing module specifically includes:

[0087] A difference acquisition unit, used to acquire the difference in light intensity between adjacent positions of light detectors corresponding to each light source;

[0088] The first interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the maximum difference value, and acquire the average value thereof as the first interface liquid level value.

[0089] The second processing module specifically includes:

[0090] An adjacent position difference value acquisition unit is used to acquire an adjacent position difference value between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on;

[0091] The second interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the adjacent position difference with the largest value, and acquire the average value thereof as the second interface liquid level value.

[0092] The fourth processing module specifically includes:

[0093] A pressure difference acquisition unit, used to acquire the pressure difference between adjacent preset liquid levels;

[0094] The fourth interface liquid level value acquisition unit is used to acquire the pressure difference with the largest value, and acquire the average value of two pressures corresponding to the pressure difference, and acquire the fourth interface liquid level value according to the average value.

[0095] In this embodiment, the two pressures corresponding to the pressure difference are the minuend pressure and the subtrahend pressure of the pressure difference.

[0096] In this embodiment, the formula for obtaining the fourth interface liquid level value according to the average pressure is:

[0097] p=ρgh, where p is the average value (average value of pressure), ρ is the liquid density (known quantity), h is the liquid level value of the fourth interface, and g is the acceleration due to gravity.

[0098] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0099] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0100] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A method for measuring the liquid level of a stratified interface in a stratified liquid, characterized in that: The liquid level value of the layered interface is obtained by tilting a light source set at a plurality of preset liquid levels and a light detector set directly opposite the light source. The liquid level measurement method comprises the following steps: S01: Control the light sources to turn on and off one by one, obtain the light intensity value of the corresponding light detector when each light source is turned on, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector as the adjacent light intensity value, wherein the adjacent light intensity value includes the upper adjacent light intensity value and the lower adjacent light intensity value; S02: Obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference; S03: obtaining the adjacent position difference between the upper adjacent position light intensity value and the lower adjacent position light intensity value of each light detector when each light source is turned on, and obtaining the second interface liquid level value according to the adjacent position difference; S04: obtaining the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtaining the third interface liquid level value according to the difference; S05: obtaining the pressure at each preset liquid level, and obtaining the pressure difference between adjacent preset liquid levels, obtaining the target pressure according to the difference, and obtaining the fourth interface liquid level value according to the target pressure; S06: performing weighted calculation according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value using preset weights to obtain a target interface liquid level value.

2. The method for measuring the liquid level of a stratified interface in a stratified liquid according to claim 1, characterized in that: The step S02 is specifically as follows: The difference in light intensity between adjacent positions of light detectors corresponding to each light source is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the first interface liquid level value.

3. The method for measuring the liquid level of a stratified interface in a stratified liquid according to claim 1, characterized in that: The step S03 is specifically as follows: Obtain the adjacent difference between the upper adjacent light intensity value and the lower adjacent light intensity value of each light detector when each light source is turned on, obtain the vertical setting distance between the two light detectors corresponding to the adjacent difference with the largest value, and obtain the average value as the second interface liquid level value.

4. The method for measuring the liquid level of a stratified interface in a stratified liquid according to claim 1, characterized in that: The step S04 is specifically as follows: When each light source is turned on, the difference between the light intensity value of the corresponding light detector and the light intensity value of the adjacent position under the light detector is obtained, and the vertical setting distance between the two light detectors corresponding to the maximum difference is obtained, and the average value is obtained as the third interface liquid level value.

5. A liquid level measuring device for a stratified interface in a stratified liquid, characterized in that: include: A processor, pressure sensors arranged at a plurality of preset liquid levels, a plurality of light sources and light detectors arranged corresponding thereto; wherein: A pressure sensor, used to obtain the pressure at each preset liquid level; A light source is tilted and arranged at a plurality of preset liquid levels to emit light in sequence; A light detector, used to obtain the light intensity value of the corresponding light detector when each light source is turned on one by one under a lightless condition, and the light intensity value of the light detector located at the upper and lower adjacent positions of the light detector is an adjacent light intensity value, wherein the adjacent light intensity value includes an upper adjacent light intensity value and a lower adjacent light intensity value; A processor comprising: A first processing module is used to obtain the difference in light intensity between adjacent positions of light detectors corresponding to each light source, and obtain the first interface liquid level value through the difference; A second processing module is used to obtain an adjacent position difference between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on, and obtain a second interface liquid level value according to the adjacent position difference; A third processing module is used to obtain the difference between the light intensity value of the light detector corresponding to each light source and the light intensity value of the adjacent position under the light detector when each light source is turned on, and obtain the third interface liquid level value according to the difference; A fourth processing module, used to obtain the pressure difference between adjacent preset liquid levels, obtain the target pressure according to the difference, and obtain the fourth interface liquid level value according to the target pressure; The fifth processing module is used to obtain a target interface liquid level value by performing weighted calculation using preset weights according to the first interface liquid level value, the second interface liquid level value, the third interface liquid level value and the fourth interface liquid level value.

6. The device for measuring the level of a stratified interface in a stratified liquid according to claim 5, characterized in that: The first processing module specifically includes: A difference acquisition unit, used to acquire the difference in light intensity between adjacent positions of light detectors corresponding to each light source; The first interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the maximum difference value, and acquire the average value thereof as the first interface liquid level value.

7. The device for measuring the level of a stratified interface in a stratified liquid according to claim 5, characterized in that: The second processing module specifically includes: An adjacent position difference value acquisition unit is used to acquire an adjacent position difference value between an upper adjacent position light intensity value and a lower adjacent position light intensity value of each light detector when each light source is turned on; The second interface liquid level value acquisition unit is used to acquire the vertical setting distance between the two light detectors corresponding to the adjacent position difference with the largest value, and acquire the average value thereof as the second interface liquid level value.

8. The device for measuring the level of a stratified interface in a stratified liquid according to claim 5, characterized in that: The fourth processing module specifically includes: A pressure difference acquisition unit, used to acquire the pressure difference between adjacent preset liquid levels; The fourth interface liquid level value acquisition unit is used to acquire the pressure difference with the largest value, and acquire the average value of two pressures corresponding to the pressure difference, and acquire the fourth interface liquid level value according to the average value.

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