Infrared water content detection device and control method thereof

Abstract

The application discloses an infrared water content detection device and a control method thereof, which comprises a main body, a concave mirror and a detection module. The main body is internally provided with a detection flow channel for flowing through the oil liquid to be detected. The opposite sides of the detection flow channel are respectively provided with a reflecting mirror and a perspective mirror. The main body is provided with a light path chamber on one side of the perspective mirror. The concave mirror is arranged at one end of the light path chamber away from the detection flow channel, and the inner concave surface of the concave mirror faces the perspective mirror. The detection module is arranged in the light path chamber and between the concave mirror and the perspective mirror, and comprises a circuit board, a transmitter and a detector. The transmitter is arranged at one end of the circuit board close to the perspective mirror, and the detector is arranged at one end of the circuit board close to the concave mirror. The circuit board is provided with a void area. The application can improve the compactness of the structure and reduce the demand for installation space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical measurement devices, in particular to an infrared water cut detection device and a control method thereof. BACKGROUND

[0002] In the field of oil water cut detection, accurately determining the water content in oil is crucial for ensuring the stable operation of equipment and controlling the quality of oil products. Currently, infrared detection technology is widely used in oil water detection due to its high efficiency and accuracy. The principle is to use the absorption characteristics of water molecules to specific wavelength infrared light. When infrared light passes through oil containing water, the specific wavelength of infrared light will be absorbed by water, resulting in a decrease in light intensity. By detecting the change in infrared intensity, the water content in the oil can be calculated.

[0003] However, common infrared water cut detection devices use traditional optical path design, with the emitter and detector placed on opposite sides of the detection flow channel. This layout requires a larger installation space for the emitter and detector, resulting in an increase in the overall volume of the detection device. In space-critical scenarios such as fuel detection for aerospace equipment, oil monitoring in narrow industrial pipelines, etc., the detection device is difficult to install and deploy, greatly limiting its application range. Moreover, the larger space occupation also reduces the integration of the device, increasing the cost of equipment manufacturing and maintenance difficulty. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an infrared water cut detection device and a control method thereof, which can improve the compactness of the structure and reduce the demand for installation space.

[0005] In a first aspect, the present application provides an infrared water cut detection device, comprising:

[0006] a main body, the main body is provided with a detection flow channel, the detection flow channel is used for flowing through the oil to be measured, the opposite sides of the detection flow channel are respectively provided with a reflecting mirror and a perspective mirror, and the main body is provided with an optical path chamber on one side of the perspective mirror;

[0007] a concave mirror, the concave mirror is arranged at one end of the optical path chamber away from the detection flow channel, and the inner concave surface of the concave mirror faces the perspective mirror;

[0008] a detection module, the detection module is arranged in the optical path chamber and located between the concave mirror and the perspective mirror, and comprises a circuit board, an emitter and a detector, the emitter is arranged at one end of the circuit board close to the perspective mirror, the detector is arranged at one end of the circuit board close to the concave mirror, and the circuit board is provided with a void area;

[0009] The emitter is configured to emit infrared light towards the mirror, the mirror is configured to reflect the infrared light emitted from the emitter towards the concave mirror, the avoidance area is configured to allow the infrared light reflected from the mirror to pass through the circuit board, the concave mirror is configured to concentrate the infrared light reflected from the mirror at the detector, the detector is configured to receive the infrared light concentrated from the concave mirror and convert the infrared light into a detection signal, and the circuit board is configured to determine the water content in the oil to be measured according to the detection signal.

[0010] The infrared water content detection device according to the first aspect of the present application has at least the following beneficial effects: the emitter is arranged at one end of the circuit board close to the perspective mirror, and emits infrared light towards the mirror after being started. After the infrared light passes through the perspective mirror, it is reflected by the mirror on the opposite side of the detection flow channel, passes through the avoidance area on the circuit board, and is incident on the concave mirror at the other end of the optical path chamber. The concave mirror concentrates the reflected infrared light, so that it is received by the detector located at one end of the circuit board close to the concave mirror. The detector converts the received infrared light into a detection signal, and the circuit board determines the water content of the oil to be measured according to the signal by using the corresponding relationship between infrared light absorption and water content. The detection module is arranged in the optical path chamber as a whole, the emitter and the detector are located on the same side, the traditional optical path layout is changed, the infrared light passes through the circuit board through the avoidance area, and the emitter and the detector are not arranged on both sides of the detection flow channel. The infrared water content detection device improves the compactness of the structure and reduces the demand for installation space.

[0011] According to some embodiments of the first aspect of the present application, a turbulence structure is arranged in the detection flow channel, the turbulence structure is spirally arranged on the inner wall of the detection flow channel, and is used to form a spiral flow of the oil to be measured in the detection flow channel.

[0012] According to some embodiments of the first aspect of the present application, an adjustable diaphragm is arranged in the optical path chamber, the adjustable diaphragm is located between the emitter and the perspective mirror, and the adjustable diaphragm is used to adjust the intensity of the infrared light entering the detection flow channel.

[0013] According to some embodiments of the first aspect of the present application, a gold plating layer is arranged on the side of the mirror facing the detection flow channel, the thickness of the gold plating layer is 50-100 nanometers, and the emitter is used to emit infrared light with a wavelength of 1900 nanometers.

[0014] According to some embodiments of the first aspect of the present application, a temperature detection probe is arranged at the oil inlet end of the detection flow channel, a temperature adjusting jacket is arranged outside the main body, a circulating channel is arranged in the jacket, and the circulating channel is used to input circulating medium with different temperatures by an external temperature control device.

[0015] According to some embodiments of the first aspect of the present application, a light shielding layer is arranged on the inner wall of the optical path chamber.

[0016] In a second aspect, the present application provides a control method of an infrared water content detection device, applied to the infrared water content detection device of any one of the embodiments of the first aspect, and the control method comprises:

[0017] starting the detection module to preheat the emitter, and after a preset first time, controlling the emitter to emit infrared light at a preset frequency, so that the infrared light passes through the oil to be measured in the detection flow channel, is reflected by the mirror and the concave mirror, and is absorbed by the detector, and the infrared light signal is converted into a detection current;

[0018] obtaining an oil inlet temperature of an oil inlet end of the detection flow channel;

[0019] determining a temperature compensation coefficient according to the oil inlet temperature and a pre-established temperature compensation model;

[0020] determining a target current according to the detection current and the temperature compensation coefficient;

[0021] determining a water content in the oil to be measured according to the target current and a preset water content calculation model.

[0022] The control method of the infrared water content detection device according to the second aspect of the present application has at least the following beneficial effects: when the emitter is just started, the intensity and stability of the infrared light emitted by the emitter may be poor, the emitter is preheated first, and the preheating is performed for a preset first time, so that the emitter can reach a stable working state. After the preheating of the emitter is completed, the infrared light is emitted at a preset frequency, the infrared light enters the detection flow channel and passes through the oil to be measured, and in this process, the water in the oil absorbs part of the infrared light energy, resulting in a change in light intensity. Subsequently, the infrared light is reflected by the mirror and the concave mirror and is absorbed by the detector. The detector converts the received infrared light signal into a detection current, and the size of the current signal reflects the intensity information of the infrared light absorbed by the oil. At the same time, the oil inlet temperature of the oil inlet end of the detection flow channel is obtained, the pre-established temperature compensation model is input with the current obtained oil inlet temperature, and the corresponding temperature compensation coefficient is calculated and determined. The obtained temperature compensation coefficient is used to correct the detection current to determine the target current, which eliminates the interference of the temperature factor on the detection current, so that the target current more accurately reflects the absorption of the water in the oil to the infrared light. Finally, according to the preset water content calculation model, the target current is input to calculate the water content in the oil to be measured. In the control method, the preheating process of the emitter ensures the stability of the emitted infrared light, avoids detection errors caused by unstable light sources, and improves the reliability of the detection results. In addition, the oil inlet temperature is considered and corrected by the temperature compensation model, which effectively eliminates the influence of the temperature on the optical properties of the oil and the performance of the detector.

[0023] According to some embodiments of the second aspect of the present application, the determining the target current according to the detected current and the temperature compensation coefficient comprises:

[0024] obtaining a dark current output by the detector before the emitter emits infrared light;

[0025] when the dark current is less than a preset tolerance error current, determining the target current according to the detected current and the temperature compensation coefficient;

[0026] when the dark current is greater than or equal to the tolerance error current, determining the target current according to a difference between the detected current and the dark current and the temperature compensation coefficient.

[0027] According to some embodiments of the second aspect of the present application, the method further comprises:

[0028] introducing standard oil into the detection flow channel; wherein the standard oil has a standard water content;

[0029] obtaining a test current detected by the detector on the standard oil;

[0030] determining a test water content of the standard oil according to the test current and the water content calculation model;

[0031] when an absolute value of a difference between the standard water content and the test water content is greater than or equal to a preset standard error threshold, correcting parameters of the water content calculation model according to the standard water content and the test water content.

[0032] According to some embodiments of the second aspect of the present application, the water content calculation model is:

[0033] C=a*I'+b;

[0034] wherein C represents the water content, I' represents the target current, and a and b respectively represent a first parameter and a second parameter of the water content calculation model;

[0035] The correcting the parameters of the water content calculation model according to the standard water content and the test water content comprises:

[0036] correcting the first parameter and the second parameter of the water content calculation model according to the standard water content and the test water content through a preset correction model; wherein the correction model is:

[0037] ΔC=C1-C0;

[0038]

[0039] b' = b0 - a0*AC;

[0040] wherein C0 represents the standard moisture content, C1 represents the test moisture content, AC represents the difference between the standard moisture content and the test moisture content, a0 represents the first parameter in the moisture content calculation model before correction, a' represents the first parameter in the moisture content calculation model after correction, b0 represents the second parameter in the moisture content calculation model before correction, and b' represents the second parameter in the moisture content calculation model after correction.

[0041] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the accompanying drawings or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0042] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and the accompanying drawings or can be learned by practice of the application.

[0043] Figure 1 Structure diagram of an infrared moisture content detection device provided by an embodiment of the application;

[0044] Figure 2 Structure diagram of an infrared moisture content detection device provided by another embodiment of the application;

[0045] Figure 3 Flow chart of a control method of an infrared moisture content detection device provided by an embodiment of the application.

[0046] The reference signs are as follows:

[0047] Body 100; detection flow channel 110; turbulence structure 111; reflector 120; perspective mirror 130; light path chamber 140; convex mirror 200; circuit board 310; emitter 320; detector 330; adjustable light diaphragm 400. DETAILED DESCRIPTION

[0048] Embodiments of the application are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the application and cannot be understood as a limitation of the application.

[0049] In the description of the application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0050] In the description of the present application, if the first, second are described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0051] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0052] In the field of oil water content detection, accurate determination of water content in oil is crucial to ensure stable operation of equipment and oil quality control. At present, infrared detection technology is widely used in oil water detection due to its high efficiency and accuracy. Its principle is to use the absorption characteristics of water molecules to specific wavelength infrared light. When infrared light passes through oil containing water, specific wavelength infrared light will be absorbed by water, resulting in a decrease in light intensity. By detecting the change of infrared intensity, the water content in oil can be calculated.

[0053] However, the common infrared water content detection device adopts traditional optical path design, and the emitter and detector are arranged on the opposite sides of the detection flow channel. Although this layout separates the emitter and detector, it requires a larger installation space for both, resulting in an increase in the overall volume of the detection device. In the scene with strict space requirements, such as fuel detection of aerospace equipment, oil monitoring in narrow industrial pipelines, etc., the detection device is difficult to install and deploy, greatly limiting its application range. Moreover, the larger space occupation also reduces the integration of the device, increases the equipment manufacturing cost and maintenance difficulty.

[0054] Based on this, the present application provides an infrared water content detection device and its control method to solve the above technical problems, and the technical scheme provided by the present application will be described in detail one by one as follows.

[0055] Reference Figure 1The application provides an infrared water content detection device, which comprises a main body 100, a concave mirror and a detection module. The main body 100 is internally provided with a detection flow channel 110 for flowing the oil liquid to be detected. The opposite sides of the detection flow channel 110 are respectively provided with a reflecting mirror 120 and a perspective mirror 130. The main body 100 is provided with a light path chamber 140 on one side of the perspective mirror 130. The concave mirror is arranged at one end of the light path chamber 140 away from the detection flow channel 110, and the inner concave surface of the concave mirror faces the perspective mirror 130. The detection module is arranged in the light path chamber 140 and between the concave mirror and the perspective mirror 130, and comprises a circuit board 310, an emitter 320 and a detector 330. The emitter 320 is arranged at one end of the circuit board 310 close to the perspective mirror 130. The detector 330 is arranged at one end of the circuit board 310 close to the concave mirror. The circuit board 310 is provided with a void area. The emitter 320 is used for emitting infrared light towards the reflecting mirror 120. The reflecting mirror 120 is used for reflecting the infrared light emitted from the emitter 320 towards the concave mirror. The void area is used for allowing the infrared light reflected from the reflecting mirror 120 to pass through the circuit board 310. The concave mirror is used for concentrating the infrared light reflected from the reflecting mirror 120 at the detector 330. The detector 330 is used for receiving the infrared light concentrated from the concave mirror and converting it into a detection signal. The circuit board 310 is used for determining the water content in the oil liquid to be detected according to the detection signal.

[0056] In the above-mentioned infrared water content detection device, the emitter 320 is arranged at one end of the circuit board 310 close to the perspective mirror 130, and emits infrared light towards the reflecting mirror 120 after being started. After passing through the perspective mirror 130, the infrared light is reflected by the reflecting mirror 120 on the opposite side of the detection flow channel 110, passes through the void area on the circuit board 310, and is shot at the concave mirror at the other end of the light path chamber 140. The concave mirror concentrates the reflected infrared light, so that it is received by the detector 330 at one end of the circuit board 310 close to the concave mirror. The detector 330 converts the received infrared light into a detection signal. The circuit board 310 determines the water content of the oil liquid to be detected according to the signal, by using the corresponding relationship between the infrared light absorption and the water content. In the application, the detection module is arranged in the light path chamber 140 as a whole, the emitter 320 and the detector 330 are located on the same side, the traditional light path layout is changed, the infrared light passes through the circuit board 310 through the void area, and the emitter 320 and the detector 330 are not separately arranged on the two sides of the detection flow channel 110. The infrared water content detection device improves the compactness of the structure and reduces the demand for installation space.

[0057] Reference Figure 2It can be understood that the detection flow channel 110 is provided with a spoiler structure 111, which is spirally arranged on the inner wall of the detection flow channel 110, and is used to make the oil liquid to be detected form a spiral flow in the detection flow channel 110. When the oil liquid to be detected flows into the detection flow channel 110, it contacts the spoiler structure 111 spirally arranged on the inner wall. Due to the special spiral shape of the spoiler structure 111, the oil liquid will be guided during the flow, thereby changing the originally relatively straight flow state to form a spiral flow. On the one hand, the interaction time of water in the oil liquid and infrared light can be significantly increased. In the traditional flow channel, the oil liquid flows linearly, and part of the water may flow out of the flow channel without being fully interacted with the infrared light. The spiral flow makes the path of the oil liquid in the flow channel longer, prolongs the residence time of the water in the infrared light propagation path, and allows the water to have more opportunities to absorb infrared light of a specific wavelength, thereby improving the accuracy of the oil liquid water content detection. On the other hand, the spiral flow can make the oil liquid more uniformly distributed in the detection flow channel 110. Avoiding the situation that the oil liquid is stratified or the local flow rate difference is too large, ensuring that the oil liquid state at each part is relatively uniform when the infrared light passes through the oil liquid, and improving the stability and reliability of the detection result.

[0058] Continuing to refer to Figure 2 It can be understood that the light path chamber 140 is provided with an adjustable diaphragm 400 between the emitter 320 and the perspective mirror 130, and the adjustable diaphragm 400 is used to adjust the intensity of the infrared light entering the detection flow channel 110. Specifically, the adjustable diaphragm 400 can be composed of a plurality of movable blades, and the opening degree of the blades can be controlled by a mechanical transmission device, such as a motor-driven gear, a lead screw, etc. When the adjustable diaphragm 400 between the emitter 320 and the perspective mirror 130 in the light path chamber 140 is working, the size of the central opening of the diaphragm can be adjusted by changing the position and angle of the blades. When the diaphragm opening increases, more infrared light can pass through the diaphragm and enter the detection flow channel 110, thereby increasing the intensity of the infrared light entering the detection flow channel 110; on the contrary, when the diaphragm opening decreases, the amount of infrared light passing through the diaphragm decreases, and the intensity of the infrared light entering the detection flow channel 110 also decreases accordingly. Different oil liquids to be detected may have different absorption characteristics of infrared light. For example, factors such as impurity content and color depth of the oil liquid will affect the absorption ability of the oil liquid to the infrared light. For oil liquid with strong absorption ability, if the initial intensity of the infrared light is too high, the light signal received by the detector 330 may be too weak to accurately detect; and for oil liquid with weak absorption ability, if the intensity of the infrared light is too low, the detector 330 may not be able to effectively distinguish the change in light intensity caused by water absorption. Adjusting the intensity of the infrared light entering the detection flow channel 110 through the adjustable diaphragm 400 can make the detection device adapt to various oil liquids under different working conditions, and improve the accuracy and applicability of the detection.

[0059] It can be understood that the mirror 120 is provided with a gold plating layer on the side facing the detection flow channel 110, the thickness of the gold plating layer is 50-100 nanometers, and the emitter 320 is used for emitting infrared light with a wavelength of 1900 nanometers. Water molecules have a specific absorption peak near 1900 nanometer wavelength. When the infrared light of this wavelength passes through the oil to be detected, the water in the oil will absorb part of the infrared light, causing the intensity of the infrared light to change. By detecting this change in light intensity, the water content in the oil can be calculated. The gold plating layer can effectively improve the reflectivity of the mirror 120 to 1900 nanometer near-infrared light, so that the reflectivity reaches more than 98%, reducing the energy loss of the infrared light during reflection and enhancing the detection signal strength.

[0060] It can be understood that the oil inlet end of the detection flow channel 110 is provided with a temperature detection probe (not shown in the figure), and the main body 100 is externally provided with a temperature adjusting jacket (not shown in the figure). The jacket is provided with a circulating channel for inputting circulating medium of different temperatures by an external temperature control device. The water content detection result of the oil will be affected by the temperature. At different temperatures, the physical properties of the oil and the interaction between water molecules and oil molecules are different, which may cause changes in the absorption and scattering characteristics of the infrared light. By monitoring the oil temperature in real time through the temperature detection probe and controlling the oil temperature within a suitable range by using the temperature adjusting jacket, the interference of temperature on the detection result can be eliminated, and the detection device can be measured under stable temperature conditions, thereby improving the accuracy of the oil water content detection. In use, the temperature control device controls the temperature and flow of the circulating medium according to the set temperature value and the actual oil temperature fed back by the temperature detection probe. When the oil temperature is higher than the set value, the temperature control device provides circulating medium with lower temperature, which flows in the circulating channel of the jacket and absorbs the heat of the oil in the main body 100 and the detection flow channel 110 through heat conduction, so as to reduce the oil temperature. Conversely, when the oil temperature is lower than the set value, the temperature control device provides circulating medium with higher temperature to transfer heat to the oil, so as to increase the oil temperature.

[0061] It can be understood that the inner wall of the light path chamber 140 is provided with a light shielding layer. Stray light will scatter and reflect in the light path chamber 140, and superimpose with the target light, causing deviation of the detected light signal. The light shielding layer can effectively absorb or block these stray light, so that the light entering the detection system is mainly the light after propagating through a specific light path and interacting with the oil to be detected, forming a relatively independent and stable optical environment inside the light path chamber 140, thereby improving the purity and accuracy of the detection signal.

[0062] In a second aspect, referring to Figure 3 The application also provides a control method of an infrared water content detection device. The control method is applied to the infrared water content detection device of any one of the embodiments of the first aspect, and can include but is not limited to the following steps:

[0063] Step S110: Start the detection module to preheat the emitter, and after a preset first time, control the emitter to emit infrared light at a preset frequency, so that the infrared light passes through the oil liquid to be measured in the detection flow channel, is then reflected by the mirror and the concave mirror, and is absorbed by the detector, and the infrared light signal is converted into a detection current.

[0064] Step S120: Obtain the oil inlet temperature at the oil inlet end of the detection flow channel.

[0065] Step S130: Determine a temperature compensation coefficient according to the oil inlet temperature and a pre-established temperature compensation model.

[0066] Step S140: Determine a target current according to the detection current and the temperature compensation coefficient.

[0067] Step S150: Determine the water content in the oil liquid to be measured according to the target current and a preset water content calculation model.

[0068] In steps S110 to S150, the intensity and stability of the infrared light emitted by the emitter may be poor when the emitter is just started. The emitter is preheated first, and the preheating is performed through a preset first time, so that the emitter can reach a stable working state. After the preheating of the emitter is completed, the infrared light is emitted at a preset frequency. The infrared light enters the detection flow channel and passes through the oil liquid to be measured. In this process, the water in the oil liquid absorbs part of the infrared light energy, resulting in a change in light intensity. Subsequently, the infrared light is reflected by the mirror and the concave mirror and is absorbed by the detector. The detector converts the received infrared light signal into a detection current. The size of the current signal reflects the intensity information of the infrared light absorbed by the oil liquid. At the same time, the oil inlet temperature at the oil inlet end of the detection flow channel is obtained. The pre-established temperature compensation model is input with the current obtained oil inlet temperature to calculate and determine the corresponding temperature compensation coefficient. The obtained temperature compensation coefficient is used to correct the detection current to determine the target current, eliminating the interference of the temperature factor on the detection current, so that the target current more accurately reflects the absorption of the water in the oil liquid to the infrared light. Finally, the target current is input into the preset water content calculation model to calculate the water content in the oil liquid to be measured. In the control method, the preheating process of the emitter ensures the stability of the emitted infrared light, avoids detection errors caused by unstable light sources, and improves the reliability of the detection result. In addition, the oil inlet temperature is considered and corrected through the temperature compensation model, effectively eliminating the influence of the temperature on the optical properties of the oil liquid and the performance of the detector.

[0069] During the training process of the temperature compensation model, experiments can be conducted in different temperature ranges and water content ranges to ensure that the experimental data can cover various situations that may be encountered in actual applications. For example, the temperature range can be from -20°C at low temperature to 80°C at high temperature, and the water content range can be from 0% to 100% (determine the appropriate range according to the actual oil situation). Under different temperature and water content conditions, multiple experiments are conducted, and the corresponding temperature value, oil water content, and detector output detection current and other data in each experiment are recorded. The collected experimental data are preprocessed, including data cleaning, removing outliers, data normalization, and other operations. For example, for outliers that deviate significantly from other data points, it needs to be determined whether it is caused by equipment failure or operation error according to the experimental situation, and the corresponding processing is performed.

[0070] If it is found through analysis that there is an approximate linear relationship between temperature, detection current, and water content, a linear regression method can be used to establish a temperature compensation model. Through algorithms such as least squares, a linear equation between temperature, detection current, and water content is fitted.

[0071] When the relationship exhibits nonlinear characteristics, polynomial regression may be more appropriate. Different orders of polynomials can be tried, and by comparing indicators such as goodness of fit and mean square error, the optimal polynomial model can be selected to describe the relationship between temperature, detection current, and water content.

[0072] For complex nonlinear relationships, artificial neural networks have strong fitting capabilities. A neural network model can be constructed that includes an input layer (temperature, detection current), a hidden layer, and an output layer (water content), and a large amount of experimental data is used for training to adjust the network's weights and thresholds so that it can accurately map the relationship between temperature, detection current, and water content.

[0073] It can be understood that in step S140, the following steps can be included but are not limited to:

[0074] Step S210: Obtain the dark current output by the detector before the emitter emits infrared light.

[0075] Step S220: When the dark current is less than the preset tolerance error current, determine the target current according to the detection current and the temperature compensation coefficient.

[0076] Step S230: When the dark current is greater than or equal to the tolerance error current, determine the target current according to the difference between the detection current and the dark current, and the temperature compensation coefficient.

[0077] In steps S210 to S230, the dark current refers to the current generated by the detector itself due to thermal noise, thermal motion of electrons and other factors when there is no light signal input. Before the infrared light is emitted by the emitter, the current output by the detector is measured to obtain the dark current. If the dark current is within an acceptable range, i.e. less than a preset tolerance error current, it indicates that the noise and other interference factors of the detector are relatively small, and the influence on the detection result can be ignored. When the dark current is large, greater than or equal to the preset tolerance error current, it indicates that the noise and other interference factors of the detector may have a greater impact on the detection result, and the detection current cannot be directly used. At this time, the detection current needs to be corrected first, i.e. the detection current is subtracted by the dark current to obtain a relatively more accurate current value that removes part of the interference, and then the target current is determined according to the difference value and the temperature compensation coefficient to eliminate the error caused by the dark current.

[0078] In the above steps, by considering the dark current and performing different processing according to its size, the influence of the noise and other factors of the detector itself on the detection result can be effectively eliminated or reduced, so that the target current obtained finally can more accurately reflect the real situation of the infrared light after passing through the oil to be tested, thereby improving the precision of the water cut detection.

[0079] It can be understood that the control method of the infrared water cut detection device can further include but is not limited to the following steps:

[0080] Step S310: standard oil is introduced into the detection flow channel; wherein the water cut of the standard oil is a standard water cut;

[0081] Step S320: obtaining a test current detected by the detector on the standard oil.

[0082] Step S330: determining the water cut of the standard oil as a test water cut according to the test current and a water cut calculation model.

[0083] Step S340: when the absolute value of the difference between the standard water cut and the test water cut is greater than or equal to a preset standard error threshold, correcting the parameters of the water cut calculation model according to the standard water cut and the test water cut.

[0084] In steps S310 to S340, the standard oil liquid with a known water content is introduced into the detection flow channel to ensure the stability of the oil liquid state in the detection flow channel. The standard oil liquid in the detection flow channel is detected by the detector, which converts the received infrared light signal affected by the standard oil liquid into an electrical signal, i.e., a test current. According to the obtained test current, the water content calculation model is established in advance, and the test water content of the standard oil liquid is obtained by the operation of the model. The absolute value of the difference between the calculated standard water content and the test water content is calculated. If the difference is greater than or equal to the preset standard error threshold, it indicates that the current water content calculation model has a certain deviation, and the parameters of the model need to be corrected according to the standard water content and the test water content. The correction process may involve adjusting the coefficients, weights and other parameters in the model to make the model more accurately reflect the relationship between the actual water content and the detection current. By comparing and correcting the standard water content of the standard oil liquid and the test water content calculated by the model, the possible deviation in the water content calculation model can be found and corrected in time, so that the model can more accurately reflect the real relationship between the water content of the oil liquid and the detection current, thereby improving the accuracy of the detection of the water content of various oil liquids.

[0085] It can be understood that the water content calculation model is:

[0086] C=a*I'+b;

[0087] Wherein, C represents the water content, I' represents the target current, a and b represent the first parameter and the second parameter of the water content calculation model respectively;

[0088] According to the standard water content and the test water content, the parameters of the water content calculation model are corrected, including:

[0089] According to the standard water content and the test water content, the first parameter and the second parameter of the water content calculation model are corrected through a preset correction model; wherein the correction model is:

[0090] ΔC=C1-C0;

[0091]

[0092] b'=b0-a0*ΔC;

[0093] Wherein, C0 represents the standard water content, C1 represents the test water content, ΔC represents the difference between the standard water content and the test water content, a0 represents the first parameter in the water content calculation model before correction, a' represents the first parameter in the water content calculation model after correction, b0 represents the second parameter in the water content calculation model before correction, and b' represents the second parameter in the water content calculation model after correction.

[0094] By correcting the parameters of the water content calculation model through a clear mathematical formula, the model parameters can be accurately adjusted according to the deviation between the actual detection result and the standard value, so that the model is more fitted to the relationship between the real water content and the target current, and the accuracy of the water content detection is further improved, and the detection result is closer to the real value.

[0095] The above describes the embodiments of the application in detail in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge range of the ordinary skill in the art without departing from the purpose of the application.

Claims

1. An infrared water content detecting device characterized by comprising: include: The main body has a detection channel inside, which is used for the oil to be tested to flow through. A reflector and a lens are respectively provided on opposite sides of the detection channel. The main body has an optical path chamber on one side of the lens. A concave mirror is disposed at one end of the optical path chamber away from the detection flow channel, with the concave surface of the concave mirror facing the fluoroscopy lens; A detection module is disposed in the optical path cavity and located between the concave mirror and the iris. It includes a circuit board, a transmitter, and a detector. The transmitter is disposed at one end of the circuit board near the iris, and the detector is disposed at one end of the circuit board near the concave mirror. The circuit board is provided with a clearance area. The transmitter emits infrared light toward the reflector, the reflector reflects the infrared light emitted from the transmitter toward the concave mirror, the clearance area allows the infrared light reflected from the reflector to pass through the circuit board, the concave mirror focuses the infrared light reflected from the reflector onto the detector, the detector receives the infrared light focused from the concave mirror and converts it into a detection signal, and the circuit board determines the water content in the oil to be tested based on the detection signal. The detection channel is provided with a turbulence structure, which is spirally wrapped around the inner wall of the detection channel to make the oil to be tested form a spiral flow in the detection channel. An adjustable aperture is provided in the optical path cavity. The adjustable aperture is located between the transmitter and the lens. The adjustable aperture is used to adjust the intensity of infrared light entering the detection channel. The oil inlet end of the detection channel is equipped with a temperature detection probe, and the main body is covered with a temperature regulating jacket. The jacket is equipped with a circulation channel for external temperature control equipment to input circulating media of different temperatures.

2. The infrared water cut detection device according to claim 1, characterized by The reflector has a gold-plated layer on the side facing the detection channel, and the thickness of the gold-plated layer is 50-100 nanometers. The emitter is used to emit infrared light with a wavelength of 1900 nanometers.

3. The infrared water cut detection apparatus according to claim 1, characterized by The inner wall of the optical path chamber is provided with a light-shielding layer.

4. A control method of an infrared water content detecting apparatus, characterized by, The control method, applied to the infrared moisture content detection device as described in any one of claims 1 to 3, comprises: The detection module is activated to preheat the transmitter, and after a preset first time, the transmitter is controlled to emit infrared light at a preset frequency so that the infrared light passes through the oil to be tested in the detection channel, and is absorbed by the detector after being reflected by the reflector and the concave mirror, and the infrared light signal is converted into a detection current. Obtain the oil inlet temperature at the oil inlet end of the detection channel; Based on the oil inlet temperature and the pre-established temperature compensation model, the temperature compensation coefficient is determined; The target current is determined based on the detected current and the temperature compensation coefficient; The water content in the oil to be tested is determined based on the target current and the preset water content calculation model.

5. The control method of the infrared water cut detection apparatus according to claim 4, characterized by, The step of determining the target current based on the detected current and the temperature compensation coefficient includes: Obtain the dark current output by the detector before the transmitter emits infrared light; When the dark current is less than a preset tolerance error current, a target current is determined according to the detection current and the temperature compensation coefficient; When the dark current is greater than or equal to the tolerance error current, a target current is determined according to a difference between the detection current and the dark current and the temperature compensation coefficient.

6. The control method of the infrared water cut detection apparatus according to claim 5, characterized by, Further comprising: standard oil liquid is introduced into the detection flow channel; wherein the water content of the standard oil liquid is a standard water content; a test current detected by the detector on the standard oil liquid is obtained; a water content of the standard oil liquid is determined as a test water content according to the test current and the water content calculation model; When an absolute value of a difference between the standard water content and the test water content is greater than or equal to a preset standard error threshold, parameters of the water content calculation model are corrected according to the standard water content and the test water content.

7. The control method of the infrared water cut detection apparatus according to claim 6, characterized by, The water content calculation model is: ； wherein C represents the water content, I' represents the target current, a and b respectively represent a first parameter and a second parameter of the water content calculation model; The correction of the parameters of the water content calculation model according to the standard water content and the test water content comprises: the first parameter and the second parameter of the water content calculation model are corrected through a preset correction model according to the standard water content and the test water content; wherein the correction model is: ； ； ； wherein C0 represents the standard water content, C1 represents the test water content, ΔC represents a difference between the standard water content and the test water content, a0 represents the first parameter in the water content calculation model before correction, a' represents the first parameter in the water content calculation model after correction, b0 represents the second parameter in the water content calculation model before correction, and b' represents the second parameter in the water content calculation model after correction.

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