Liquid level detection method and system, electronic equipment and storage medium

Abstract

The invention provides a liquid level detection method and system, electronic equipment and a storage medium, the method is applied to a power plant liquid level detection system, the liquid level detection system comprises a liquid level detection device and a liquid storage cavity, the liquid level detection device comprises a fixed column, and the two ends of the fixed column are each provided with an optical fiber pressure sensor; a plurality of optical fiber pressure sensors are arranged between the two optical fiber pressure sensors at the two ends of the fixing column, one end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, the other end of the liquid level detection device extends out of the liquid storage cavity, and the liquid level detection method comprises the steps that multiple pieces of pressure data are acquired through the multiple optical fiber pressure sensors; determining at least one air pressure data and at least one hydraulic pressure data in the plurality of pressure data; correcting the hydraulic data according to the air pressure data to obtain corrected hydraulic data; and the liquid level height in the liquid storage cavity is determined according to the corrected hydraulic data. The accuracy of liquid level detection of the nuclear power plant can be improved.

Description

Technical Field

[0001] The present application relates to the field of liquid level detection, and in particular to a liquid level detection method and system, electronic equipment and storage medium. Background Art

[0002] There are a large number of liquid storage facilities in nuclear power plants, including waste liquid collection pits, various storage tanks, etc. The changes in the liquid level in these facilities are directly related to the safe operation of the nuclear power plant. Accurate liquid level detection can not only ensure the normal operation of various equipment, but also timely discover potential safety hazards such as liquid leakage, which is of great significance for preventing nuclear power accidents and ensuring environmental safety. Therefore, establishing a reliable liquid level detection system is an important guarantee for the safe operation of nuclear power plants.

[0003] In the relevant technology, nuclear power plants mainly use ultrasonic level gauges and float level gauges for liquid level detection. Ultrasonic level gauges use non-contact measurement and have the advantage of easy installation and maintenance, but they are easily disturbed by liquid surface foam during the measurement process, resulting in large deviations in the measurement results. Although the float level gauge has a simple structure and intuitive measurement, when the liquid fluctuates violently, the measured value will become unstable. It can be seen that in the special application environment of nuclear power plants, various environmental difference factors will affect the measurement accuracy of existing level gauges, making it difficult for the accuracy of liquid level detection to meet the requirements for safe operation of nuclear power plants. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a liquid level detection method and system, an electronic device and a storage medium, which can improve the accuracy of liquid level detection in a nuclear power plant.

[0005] In a first aspect, an embodiment of the present application provides a liquid level detection method for a nuclear power plant, the method being applied to a liquid level detection system of a nuclear power plant, the liquid level detection system comprising a liquid level detection device and a liquid storage cavity, the liquid level detection device comprising a fixed column, an optical fiber pressure sensor being respectively arranged at both ends of the fixed column, and a plurality of optical fiber pressure sensors being arranged between the two optical fiber pressure sensors at both ends of the fixed column, one end of the liquid level detection device being fixed to the bottom of the liquid storage cavity, and the other end extending out of the liquid storage cavity, the liquid level detection method comprising:

[0006] Acquire a plurality of pressure data by collecting the plurality of optical fiber pressure sensors;

[0007] Determine at least one air pressure data and at least one hydraulic pressure data among the plurality of pressure data;

[0008] Correcting the hydraulic pressure data according to the air pressure data to obtain the corrected hydraulic pressure data;

[0009] The height of the liquid level in the liquid storage chamber is determined according to the corrected hydraulic pressure data.

[0010] In some embodiments, the collecting and obtaining the plurality of pressure data by the plurality of optical fiber pressure sensors specifically includes:

[0011] Transmitting incident light signals to the plurality of optical fiber pressure sensors to obtain reflected light signals reflected from the plurality of optical fiber pressure sensors;

[0012] Performing spectral separation on each of the reflected light signals to obtain a plurality of monochromatic light wavelength signals;

[0013] Waveform fitting and optical path phase demodulation are performed on each of the monochromatic light wavelength signals to obtain the pressure data.

[0014] In some embodiments, performing waveform fitting and optical path phase demodulation on the plurality of monochromatic light wavelength signals to obtain the pressure data includes:

[0015] Performing peak recognition on the monochromatic waveform curve of each monochromatic light wavelength signal, and separating the monochromatic waveform curve into a plurality of sub-waveform signals;

[0016] Performing clipping processing on each of the sub-waveform signals to obtain a plurality of sub-waveform signals after clipping processing;

[0017] Fitting the sub-waveform signal after the clipping process to obtain a plurality of fitting sub-waveforms;

[0018] Calculating the corresponding target displacement value according to the optical path phase difference of each of the fitted sub-waveforms;

[0019] The pressure data is calculated according to each of the target displacement values.

[0020] In some embodiments, the optical fiber pressure sensor includes an optical cavity pressure sensing element and a temperature measuring grating element, the reflected light signal includes an optical cavity reflection signal and a grating reflection signal, and after transmitting an incident light signal to the multiple optical fiber pressure sensors to obtain reflected light signals reflected from the multiple optical fiber pressure sensors, the method further includes:

[0021] Acquiring the grating reflection signal through the temperature measuring grating element;

[0022] Demodulating the grating reflection signal to obtain target temperature data;

[0023] The pressure data is corrected according to the target temperature data to obtain the corrected pressure data.

[0024] In some embodiments, determining at least one air pressure data and at least one hydraulic pressure data from among the plurality of pressure data comprises:

[0025] Acquire the multiple pressure data, and sort the multiple pressure data;

[0026] Determining pressure data satisfying a preset air pressure characteristic condition among the plurality of pressure data as the air pressure data;

[0027] The pressure data that is greater than the air pressure data and increases with depth among the plurality of pressure data is determined to be the hydraulic pressure data.

[0028] In some embodiments, the correcting the hydraulic pressure data according to the air pressure data to obtain the corrected hydraulic pressure data includes:

[0029] Determining the air pressure in the liquid storage cavity according to the air pressure data;

[0030] comparing the air pressure in the liquid storage chamber with the atmospheric pressure;

[0031] In response to the air pressure being greater than the atmospheric pressure, calculating the air pressure difference between the air pressure data and the atmospheric pressure;

[0032] The hydraulic data is corrected according to the air pressure difference to obtain the corrected hydraulic data.

[0033] In some embodiments, calculating the liquid level in the liquid storage chamber according to the hydraulic data includes:

[0034] Obtaining the liquid density of the liquid in the liquid storage cavity;

[0035] Calculating the product of the liquid density and the gravitational acceleration constant;

[0036] The hydraulic pressure data is divided by the product of the liquid density value and the gravitational acceleration constant to calculate the liquid level height.

[0037] In some embodiments, when the hydraulic pressure data is multiple, after obtaining the liquid density of the liquid in the liquid storage chamber, the method further includes:

[0038] The optical fiber pressure sensor located at the bottom of the liquid is determined as the main measuring point, and the remaining optical fiber pressure sensors in the liquid are determined as liquid level verification points;

[0039] Obtaining a layout height difference between the main measuring point and each of the liquid level verification points;

[0040] Calculating the pressure difference between the hydraulic data corresponding to the main measuring point and the hydraulic data corresponding to each of the liquid level verification points;

[0041] Calculating the actual density value of the liquid according to each of the arrangement height differences and the corresponding pressure difference, and updating the density of the liquid according to the actual density value of the liquid;

[0042] The liquid level height is recalculated according to the updated liquid density.

[0043] In a second aspect, an embodiment of the present application provides a liquid level detection system for a nuclear power plant, comprising:

[0044] A liquid level detection device, the liquid level detection device comprising a fixed column, each of the two ends of the fixed column is provided with an optical fiber pressure sensor, a plurality of optical fiber pressure sensors are provided between the two optical fiber pressure sensors at the two ends of the fixed column, one end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity;

[0045] A host computer, the host computer is communicatively connected with the liquid level detection device, and is used to collect a plurality of the pressure data through the multiple optical fiber pressure sensors; determine at least one air pressure data and at least one hydraulic pressure data among the multiple pressure data; correct the hydraulic data according to the air pressure data to obtain the corrected hydraulic data; and calculate the liquid level height in the liquid storage cavity according to the corrected hydraulic data.

[0046] In some embodiments, the optical fiber pressure sensor includes an optical cavity pressure-sensitive element and a temperature-measuring grating element; the optical cavity pressure-sensitive element is used to measure pressure, and the temperature-measuring grating element is used to measure temperature.

[0047] In some embodiments, the optical cavity pressure-sensitive element is a full quartz film.

[0048] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements a nuclear power plant liquid level detection method as described in any one of the embodiments of the first aspect of the present application.

[0049] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the storage medium stores a program, and the program is executed by a processor to implement a nuclear power plant liquid level detection method as described in any one of the embodiments of the first aspect of the present application.

[0050] The nuclear power plant liquid level detection method according to the embodiment of the present application has at least the following beneficial effects:

[0051] According to the nuclear power plant liquid level detection method of the embodiment of the present application, the method is applied to the power plant liquid level detection system, the liquid level detection system includes a liquid level detection device and a liquid storage cavity, the liquid level detection device includes a fixed column, and an optical fiber pressure sensor is respectively arranged at both ends of the fixed column, and multiple optical fiber pressure sensors are arranged between the two optical fiber pressure sensors at both ends of the fixed column. One end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity. The liquid level detection method includes: collecting multiple pressure data through multiple optical fiber pressure sensors; determining at least one air pressure data and at least one hydraulic pressure data among the multiple pressure data; correcting the hydraulic data according to the air pressure data to obtain corrected hydraulic data; and determining the liquid level height in the liquid storage cavity according to the corrected hydraulic data.

[0052] The present application can realize continuous and stable monitoring of liquid pressure by arranging multiple optical fiber pressure sensors on the fixed column and vertically installing the fixed column in the liquid storage cavity, thereby avoiding the measurement instability problem caused by the liquid surface fluctuation of the float type liquid level gauge. Then, based on the multiple pressure data collected, the air pressure data and the hydraulic pressure data are distinguished, so that they are not affected by the liquid surface foam, and the defect of the ultrasonic liquid level gauge causing measurement deviation due to the foam interference is overcome. Next, by correcting the hydraulic pressure data using the air pressure data, the influence of the air pressure change in the liquid storage cavity on the liquid level measurement can be effectively eliminated, and the accurate acquisition of the real hydraulic pressure can be achieved. Finally, based on the corrected hydraulic pressure data, the liquid level height in the liquid storage cavity can be accurately calculated, and the calculation process is not disturbed by liquid fluctuations and foam, so as to achieve accurate measurement of the liquid level. Compared with the float type liquid level gauge that is susceptible to liquid surface fluctuations and the ultrasonic liquid level gauge that is susceptible to foam interference in the prior art, the method provided in the embodiment of the present application is based on the optical fiber pressure sensor and the air pressure correction mechanism, which can effectively overcome the measurement interference caused by the special application environment of the nuclear power plant and improve the accuracy of the liquid level detection of the nuclear power plant.

[0053] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0055] Figure 1 A flow chart of an optional nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0056] Figure 2 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0057] Figure 3Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0058] Figure 4 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0059] Figure 5 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0060] Figure 6 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0061] Figure 7 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0062] Figure 8 Another optional flow chart of a nuclear power plant liquid level detection method provided in an embodiment of the present application;

[0063] Fig. 9 A schematic diagram of a liquid level detection system for a nuclear power plant provided in an embodiment of the present application;

[0064] Fig.10 A schematic diagram of an optical fiber pressure sensor provided in an embodiment of the present application;

[0065] Fig.11 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0066] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0067] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first", "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0068] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, left, right, front, back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0070] In the description of this application, it should be noted that, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution. In addition, the identification of specific steps below does not represent a limitation on the order of steps and execution logic. The execution order and execution logic between each step should be understood and inferred with reference to the contents described in the embodiment.

[0071] There are a large number of liquid storage facilities in nuclear power plants, including waste liquid collection pits, various storage tanks, etc. The changes in the liquid level in these facilities are directly related to the safe operation of the nuclear power plant. Accurate liquid level detection can not only ensure the normal operation of various equipment, but also timely discover potential safety hazards such as liquid leakage, which is of great significance for preventing nuclear power accidents and ensuring environmental safety. Therefore, establishing a reliable liquid level detection system is an important guarantee for the safe operation of nuclear power plants.

[0072] In the relevant technology, nuclear power plants mainly use ultrasonic level gauges and float level gauges for liquid level detection. Ultrasonic level gauges use non-contact measurement to measure the liquid level by emitting ultrasonic signals and receiving reflected signals, and have the advantages of easy installation and maintenance. However, ultrasonic level gauges have the following problems in practical applications: First, due to the propagation characteristics of ultrasonic waves, the level gauge has a measurement blind spot, which requires that the probe must be raised a certain distance above the blind spot during installation, resulting in the need for the equipment to be installed exposed, which not only affects the appearance but also increases the risk of accidental collision; secondly, when foam appears on the liquid surface, the ultrasonic signal will be reflected on the surface of the foam layer, and the true liquid level cannot be accurately measured, resulting in a large measurement deviation; in addition, in a closed container, when there is a large difference between the medium temperature and the ambient temperature, condensation water droplets are easily formed around the probe, further affecting the measurement accuracy.

[0073] The float type liquid level gauge is mainly composed of a float, a connecting rod and an indicating device. The float indicates the liquid level by rising and falling with the liquid surface. It has a simple structure and intuitive measurement. However, this type of liquid level gauge also has obvious defects: when the liquid fluctuates violently, the float will shake up and down, resulting in unstable measurement values; at the same time, the float surface is easily contaminated by the liquid, affecting the stability of the buoyancy, thereby reducing the accuracy and reliability of the measurement.

[0074] In summary, in a special application environment such as a nuclear power plant, various environmental factors such as liquid fluctuations and foam will affect the measurement accuracy of existing liquid level meters. Especially when measuring special media such as waste liquid, the uncertainty and variability of liquid density increase the difficulty of liquid level detection. Therefore, the existing technology is difficult to meet the requirements of nuclear power plant safe operation for liquid level detection accuracy, and a new liquid level detection solution that can overcome the above problems is urgently needed.

[0075] Based on this, the present application proposes a liquid level detection method for a nuclear power plant. By arranging multiple optical fiber pressure sensors on a fixed column and vertically installing the fixed column in the liquid storage cavity, continuous and stable monitoring of the liquid pressure can be achieved, avoiding the measurement instability problem of the float-type liquid level gauge caused by liquid surface fluctuations. Then, based on the multiple pressure data collected, the air pressure data and the hydraulic data are distinguished, so that they are not affected by the liquid surface foam, and the defect of the ultrasonic liquid level meter causing measurement deviation due to foam interference is overcome. Next, by using the air pressure data to correct the hydraulic data, the influence of the air pressure change in the liquid storage cavity on the liquid level measurement can be effectively eliminated, and the accurate acquisition of the real hydraulic pressure can be achieved. Finally, based on the corrected hydraulic data, the liquid level height in the liquid storage cavity can be accurately calculated. The calculation process is not affected by liquid fluctuations and foam, thereby achieving accurate measurement of the liquid level. Compared with the float-type liquid level gauge in the prior art that is easily affected by liquid surface fluctuations and the ultrasonic liquid level gauge that is easily affected by foam interference, the method provided in the embodiment of the present application is based on optical fiber pressure sensing and air pressure correction mechanism, which can effectively overcome the measurement interference caused by the special application environment of nuclear power plants and improve the accuracy of liquid level detection in nuclear power plants.

[0076] The following is a detailed explanation of the nuclear power plant liquid level detection method proposed in this application.

[0077] See also Figure 1 A method for detecting a liquid level in a nuclear power plant provided by an embodiment of the present invention is applied to a liquid level detection system in a nuclear power plant. The liquid level detection system includes a liquid level detection device and a liquid storage cavity. The liquid level detection device includes a fixed column. An optical fiber pressure sensor is respectively arranged at both ends of the fixed column. A plurality of optical fiber pressure sensors are arranged between the two optical fiber pressure sensors at both ends of the fixed column. One end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity. The method may include, but is not limited to, the following steps 101 to 104:

[0078] Step 101: Acquire a plurality of pressure data by using a plurality of optical fiber pressure sensors.

[0079] Step 102: Determine at least one air pressure data and at least one hydraulic pressure data from a plurality of pressure data.

[0080] Step 103, correcting the hydraulic data according to the air pressure data to obtain corrected hydraulic data.

[0081] Step 104: determine the liquid level in the liquid storage chamber according to the corrected hydraulic pressure data.

[0082] Through steps 101 to 104, the embodiment of the present application can realize continuous and stable monitoring of liquid pressure by setting multiple optical fiber pressure sensors on the fixed column and vertically installing the fixed column in the liquid storage cavity, thereby avoiding the measurement instability problem of the float-type liquid level gauge caused by liquid surface fluctuations. Then, based on the multiple pressure data collected, the air pressure data and the hydraulic data are distinguished, so that they are not affected by the foam on the liquid surface, and the defect of the ultrasonic liquid level meter causing measurement deviation due to foam interference is overcome. Next, by correcting the hydraulic data using the air pressure data, the influence of the air pressure change in the liquid storage cavity on the liquid level measurement can be effectively eliminated, and the accurate acquisition of the real hydraulic pressure can be achieved. Finally, based on the corrected hydraulic data, the liquid level height in the liquid storage cavity can be accurately calculated. The calculation process is not affected by liquid fluctuations and foam, thereby achieving accurate measurement of the liquid level. Compared with the float-type liquid level gauge in the prior art that is easily affected by liquid surface fluctuations and the ultrasonic liquid level gauge that is easily affected by foam interference, the method provided in the embodiment of the present application is based on optical fiber pressure sensing and air pressure correction mechanism, which can effectively overcome the measurement interference caused by the special application environment of nuclear power plants and improve the accuracy of liquid level detection in nuclear power plants.

[0083] In step 101 of some embodiments, the pressure data at different heights in the liquid storage cavity can be collected in real time by using multiple fiber optic pressure sensors evenly arranged on the fixed column. Each fiber optic pressure sensor is integrated with an optical cavity pressure-sensitive element. When there is pressure at the location of the fiber optic pressure sensor, the pressure will act on the optical cavity pressure-sensitive element, causing the deformation of the optical cavity. By detecting the change in the reflected light signal caused by this deformation, the pressure data at the location can be obtained. Since multiple fiber optic pressure sensors are vertically distributed on the fixed column, the pressure data at different heights in the liquid storage cavity can be obtained at the same time.

[0084] See also Figure 2 In some embodiments, step 101 may include, but is not limited to, steps 201 to 203 .

[0085] Step 201: transmitting an incident light signal to a plurality of optical fiber pressure sensors to obtain reflected light signals reflected from the plurality of optical fiber pressure sensors.

[0086] Step 202: spectrally separate each reflected light signal to obtain a plurality of monochromatic light wavelength signals.

[0087] Step 203: perform waveform fitting and optical path phase demodulation on each monochromatic light wavelength signal to obtain pressure data.

[0088] In step 201 of some embodiments, the demodulator may be controlled to transmit the incident light signal to each optical fiber pressure sensor through the optical fiber, and then the incident light signal is reflected by the optical cavity pressure-sensitive element inside the optical fiber pressure sensor. When the optical cavity pressure-sensitive element is subjected to the surrounding pressure, it will deform, and this deformation will change the characteristics of the reflected light signal. Therefore, by collecting the returned reflected light signal, the pressure information of the environment in which the optical cavity pressure-sensitive element is located can be obtained.

[0089] See also Figure 3 In some embodiments, the optical fiber pressure sensor includes an optical cavity pressure sensing element and a temperature measuring grating element, and the reflected light signal includes an optical cavity reflection signal and a grating reflection signal. After step 201, it may also include, but not limited to, steps 301 to 303.

[0090] Step 301, obtaining a grating reflection signal through a temperature measuring grating element.

[0091] Step 302: demodulate the grating reflection signal to obtain target temperature data.

[0092] Step 303: Correct the pressure data according to the target temperature data to obtain corrected pressure data.

[0093] In step 301 of some embodiments, after the incident light signal reaches the temperature measuring grating element through the optical fiber, Bragg reflection is generated at a specific wavelength due to the periodic structure of the grating. This reflected light signal carries the temperature information of the environment in which the temperature measuring grating element is located. When the ambient temperature changes, it will cause the grating period to change, thereby causing the central wavelength of the reflected light signal to drift.

[0094] In step 302 of some embodiments, after receiving the grating reflection signal, the demodulator first filters the signal to remove noise. Then, the center wavelength drift of the grating reflection signal is calculated by the wavelength demodulation algorithm. Since there is a linear relationship between the wavelength drift of the grating and the temperature change, the wavelength drift can be converted into actual temperature data according to the pre-calibrated temperature coefficient.

[0095] In step 303 of some embodiments, since the pressure response characteristics of the optical cavity pressure-sensitive element will change with temperature, it is necessary to perform temperature compensation on the measured pressure data. Specifically, based on the acquired target temperature data and the temperature-pressure cross-sensitivity coefficient of the optical fiber pressure sensor, the pressure measurement error caused by the temperature change is calculated, and this error is deducted from the original pressure data, thereby obtaining the pressure data without the temperature effect.

[0096] Through step 301 to step 303, this embodiment realizes temperature compensation for pressure measurement. Since the optical cavity pressure sensing element and the temperature measuring grating element are integrated in the same optical fiber pressure sensor, pressure and temperature data can be obtained at the same time, and temperature compensation can be performed in time, which effectively improves the accuracy of pressure measurement. This design overcomes the defect that traditional pressure sensors are easily affected by temperature, making the measurement results more reliable.

[0097] In step 202 of some embodiments, since the reflected light signal contains multiple light signals of different wavelengths, these light signals need to be separated. The demodulator performs wavelength separation on the reflected light signal through a spectrum analyzer to obtain multiple monochromatic light signals with different central wavelengths. There is a corresponding relationship between the wavelength variation of these monochromatic light signals and the deformation of the optical cavity pressure-sensitive element.

[0098] In step 203 of some embodiments, the demodulator uses a Gaussian fitting algorithm to perform waveform fitting on the monochromatic light wavelength signal to obtain the wavelength drift. Then, according to the optical path phase demodulation algorithm, the wavelength drift is converted into the deformation amount of the optical cavity. Finally, based on the calibration relationship between the optical cavity deformation amount and the pressure, the actual pressure data is calculated.

[0099] See also Figure 4 In some embodiments, step 203 may include, but is not limited to, steps 401 to 405.

[0100] Step 401 : performing peak recognition on the monochromatic waveform curve of each monochromatic light wavelength signal, and separating the monochromatic waveform curve into a plurality of sub-waveform signals.

[0101] Step 402, performing clipping processing on each sub-waveform signal to obtain a plurality of clipped sub-waveform signals.

[0102] Step 403, fitting the sub-waveform signal after the clipping process to obtain a plurality of fitting sub-waveforms.

[0103] Step 404, calculating the corresponding target displacement value according to the optical path phase difference of each fitting sub-waveform.

[0104] Step 405: Calculate and obtain pressure data according to each target displacement value.

[0105] In step 401 of some embodiments, since the waveform curve of the monochromatic light wavelength signal contains multiple peaks and troughs, it is necessary to first identify these characteristic points. By setting a suitable threshold and search window, each peak point on the waveform curve can be accurately located. According to the identified peak points, the complete monochromatic waveform curve is separated into multiple independent sub-waveform signals, each of which corresponds to a complete fluctuation cycle.

[0106] In step 402 of some embodiments, in order to eliminate the influence of environmental noise and interference signals on the waveform, it is necessary to perform clipping processing on the separated sub-waveform signal. Specifically, by setting upper and lower clipping thresholds, the signal amplitude exceeding the threshold range is limited to obtain a sub-waveform signal with suppressed noise. This clipping processing can improve the accuracy of subsequent waveform fitting.

[0107] In step 403 of some embodiments, a Gaussian fitting algorithm is used to perform curve fitting on the sub-waveform signal after clipping. The error between the fitting curve and the actual sub-waveform signal is minimized by iteratively optimizing the fitting parameters, thereby obtaining a smooth and continuous fitting sub-waveform. These fitting sub-waveforms can accurately reflect the deformation characteristics of the optical cavity pressure-sensitive element.

[0108] In step 404 of some embodiments, based on the fiber Bragg grating sensing principle, the deformation of the optical cavity will cause the optical path phase of the reflected light signal to change. By calculating the optical path phase difference of each fitting sub-waveform and combining it with the calibration coefficient of the optical fiber pressure sensor, the actual displacement value of the optical cavity pressure sensing element, that is, the target displacement value, can be obtained.

[0109] In step 405 of some embodiments, based on the definite functional relationship between the displacement of the optical cavity pressure-sensitive element and the applied pressure, the actual pressure data can be calculated according to the target displacement value obtained in the above steps and the pressure response characteristics of the optical fiber pressure sensor. The pressure data obtained in this way has high accuracy and reliability.

[0110] Through the above steps 401 to 405, this embodiment realizes the conversion process from optical signal to pressure data. This process effectively improves the measurement accuracy of optical fiber pressure sensing through signal processing processes such as waveform separation, clipping processing, and curve fitting, and provides a reliable pressure data basis for subsequent liquid level calculation.

[0111] Through step 201 to step 203, this embodiment realizes accurate measurement of pressure at different height positions in the liquid storage cavity. Among them, the emission of the incident light signal and the collection of the reflected light signal are completed by the demodulator, the pressure perception and light signal modulation of the optical cavity pressure sensing element are completed by the optical fiber pressure sensor, and the spectrum separation and signal demodulation are completed by the signal processing unit of the demodulator. This pressure measurement method based on optical fiber sensing has the characteristics of anti-electromagnetic interference and high sensitivity, which can ensure the accuracy of pressure data.

[0112] In step 102 of some embodiments, since there are both liquid and air in the liquid storage cavity, part of the optical fiber pressure sensor may be below the liquid surface and the other part may be in the air, so the pressure data obtained also includes air pressure data and hydraulic pressure data. This embodiment can distinguish between air pressure data and hydraulic pressure data by analyzing the numerical values ​​and change trends of multiple pressure data. Specifically, the optical fiber pressure sensor located above the liquid surface is only affected by the air pressure, and its pressure data is relatively small and has similar values. These pressure data are air pressure data. The optical fiber pressure sensor located below the liquid surface is affected by both the static pressure of the liquid and the air pressure above. Its pressure data is significantly greater than the air pressure data, and it increases with the increase of depth. These pressure data are hydraulic pressure data.

[0113] See also Figure 5 In some embodiments, step 102 may include, but is not limited to, steps 501 to 503.

[0114] Step 501: Acquire multiple pressure data and sort the multiple pressure data.

[0115] Step 502: determine the pressure data satisfying the preset air pressure characteristic condition among the multiple pressure data as the air pressure data.

[0116] Step 503: determine that the pressure data among the multiple pressure data that is greater than the air pressure data and increases with depth is the hydraulic pressure data.

[0117] In step 501 of some embodiments, it is necessary to first obtain pressure data collected by multiple optical fiber pressure sensors and sort these data according to the numerical value. For example, assuming that 5 optical fiber pressure sensors are arranged on the fixed column from bottom to top, the pressure data collected are: 120kPa, 118kPa, 102kPa, 85kPa, 85kPa. At this time, these pressure data are sorted from small to large as: 85kPa, 85kPa, 102kPa, 118kPa, 120kPa.

[0118] In step 502 of some embodiments, the present embodiment identifies air pressure data by setting a preset air pressure characteristic condition. Among them, the preset air pressure characteristic condition may include: the values ​​of the pressure data are similar and the values ​​are the smallest. Specifically, if the difference between multiple pressure data is less than a preset threshold (for example, 1kPa), it can be determined that these data are air pressure data. In the above example, it can be observed that the pressure values ​​measured by the two top sensors are both 85kPa, which are the same and the smallest, so it can be determined that these two data are air pressure data, indicating that the liquid level position is below the position of the third sensor.

[0119] In step 503 of some embodiments, this embodiment determines data that is greater than the determined air pressure data and whose pressure value increases with increasing depth as hydraulic data. This is because according to the principle of fluid statics, the pressure in the liquid increases linearly with increasing depth. In the above example, the pressure values ​​measured by the third to fifth sensors are 102kPa, 118kPa, and 120kPa, respectively, which are all greater than the air pressure value of 85kPa, and increase with increasing depth. Therefore, these three data can be determined to be hydraulic data.

[0120] Through step 501 to step 503, this embodiment realizes accurate distinction between air pressure data and hydraulic pressure data. This identification method based on the pressure value and change trend can not only determine the liquid level position, but also provide a reliable data basis for subsequent air pressure correction and liquid level calculation. For example, in the above example, it can be preliminarily determined that the liquid level position is between the second and third sensors, which provides a reference for subsequent accurate liquid level calculation.

[0121] In step 103 of some embodiments, considering that the air pressure inside the liquid storage cavity may be different from the atmospheric pressure, this difference will affect the accuracy of the liquid level measurement. Therefore, this embodiment uses the acquired air pressure data to correct the hydraulic data. When it is detected that the air pressure inside the liquid storage cavity is greater than the atmospheric pressure, it indicates that there is an additional air pressure effect, and it is necessary to subtract the effect of this part of the additional air pressure from the hydraulic data to obtain the real hydraulic data.

[0122] See also Figure 6 In some embodiments, step 103 may include, but is not limited to, steps 601 to 604.

[0123] Step 601, determining the air pressure in the liquid storage chamber according to the air pressure data.

[0124] Step 602, comparing the air pressure in the liquid storage chamber with the atmospheric pressure.

[0125] Step 603, in response to the air pressure being greater than the atmospheric pressure, calculating the pressure difference between the air pressure data and the atmospheric pressure.

[0126] Step 604, correcting the hydraulic data according to the air pressure difference to obtain corrected hydraulic data.

[0127] In step 601 of some embodiments, when multiple air pressure data are obtained, it is necessary to determine the actual air pressure in the liquid storage cavity through data processing. Since the air pressure in the liquid storage cavity is equal everywhere on the same horizontal plane, the multiple air pressure data can be averaged to eliminate the influence of measurement errors. For example, if the multiple air pressure data obtained are 105kPa, 104kPa and 106kPa respectively, it can be calculated that the actual air pressure in the liquid storage cavity is 105kPa.

[0128] In step 602 of some embodiments, the liquid storage cavity is a closed space, and its internal air pressure may change due to factors such as temperature change and gas release. Therefore, it is necessary to compare the determined air pressure with the standard atmospheric pressure (101.325 kPa). The purpose of this step is to determine whether the liquid storage cavity is in a positive pressure state, that is, whether the internal air pressure is greater than the external atmospheric pressure. When the liquid storage cavity is in a positive pressure state, this pressure difference will affect the liquid level measurement.

[0129] In step 603 of some embodiments, if it is detected that the air pressure in the liquid storage chamber is greater than the atmospheric pressure, the pressure difference of the excess portion needs to be calculated. According to the previous example, if the air pressure in the liquid storage chamber is 105 kPa, the pressure difference is 105 kPa-101.325 kPa=3.675 kPa. This difference represents the excess air pressure in the liquid storage chamber, which will be superimposed on the static pressure of the liquid and affect the liquid level measurement.

[0130] In step 604 of some embodiments, since the hydraulic data includes the static pressure of the liquid and the air pressure above, it is necessary to remove the extra air pressure effect. Specifically, the air pressure difference is subtracted from the hydraulic data to obtain the true static pressure data of the liquid. For example, if the hydraulic data at a certain position is 150kPa and the air pressure difference is 3.675kPa, the corrected hydraulic data is 146.325kPa. This correction process is based on Pascal's principle, that is, the fluid pressure is equal in all directions and the pressure can be superimposed.

[0131] Through step 601 to step 604, this embodiment implements air pressure correction of hydraulic data. This correction mechanism takes into account the particularity of the liquid storage cavity as a closed space and effectively eliminates the influence of air pressure changes on liquid level measurement. Especially in the nuclear power plant environment, since the process may cause the pressure in the liquid storage cavity to change, this air pressure correction mechanism helps to improve the accuracy of liquid level measurement.

[0132] In step 104 of some embodiments, after obtaining the corrected hydraulic data, the embodiment calculates the liquid level according to the principle of fluid statics. Since there is a certain functional relationship between the static pressure of the liquid and the liquid level, the actual liquid level in the liquid storage cavity can be obtained by substituting the corrected hydraulic data into the calculation formula. This liquid level measurement method based on the pressure principle is not affected by factors such as liquid surface fluctuations and foam, and can ensure the accuracy and stability of the measurement results.

[0133] See also Figure 7 In some embodiments, step 104 may include, but is not limited to, steps 701 to 703 .

[0134] Step 701, obtaining the liquid density of the liquid in the liquid storage chamber.

[0135] Step 702, calculate the product of liquid density and gravitational acceleration constant.

[0136] Step 703: Divide the hydraulic pressure data by the product of the liquid density value and the gravity acceleration constant to calculate the liquid level height.

[0137] In step 701 of some embodiments, it is necessary to first obtain the density value of the liquid in the liquid storage chamber. In the application scenario of a nuclear power plant, different types of liquids have different density characteristics. For example, the density of pure water is about 1000 kg / m3, while the density of waste liquid containing impurities may be greater. Accurately obtaining the density of the liquid is crucial for subsequent liquid level calculations, because the deviation of the density value will directly affect the accuracy of the liquid level calculation.

[0138] In step 702 of some embodiments, based on the principle of fluid statics, the relationship between the static pressure of the liquid and the liquid level can be expressed by the formula P=ρgh, where ρ is the liquid density and g is the acceleration due to gravity (about 9.81m / s2). Therefore, it is necessary to first calculate the product of the liquid density and the acceleration due to gravity, ρg. For example, for pure water with a density of 1000kg / m3, ρg=9810N / m3 is calculated. This product represents the pressure increment generated by a unit height liquid column.

[0139] In step 703 of some embodiments, the corrected hydraulic data is divided by ρg according to the basic equation of fluid statics to obtain the liquid level. For example, if the corrected hydraulic data of a certain measuring point is 19620Pa and the liquid density is 1000kg / m3, the liquid level of the point can be calculated as h=19620 / (1000×9.81)=2m.

[0140] Through step 701 to step 703, this embodiment realizes the conversion from pressure data to liquid level height based on the principle of fluid statics. The advantage of this method is that the calculation principle is clear and the physical meaning is clear. As long as the liquid density value is accurately obtained, high-precision liquid level measurement can be achieved. Especially in the complex application environment of nuclear power plants, this liquid level calculation method based on the pressure principle has strong adaptability and reliability.

[0141] See also Figure 8 In some embodiments, when there are multiple hydraulic data, after step 701 , steps 801 to 805 may be included, but not limited to.

[0142] Step 801, determining the optical fiber pressure sensor located at the bottom of the liquid as the main measuring point, and determining the remaining optical fiber pressure sensors in the liquid as liquid level verification points.

[0143] Step 802: Obtain the height difference between the main measuring point and each liquid level verification point.

[0144] Step 803, calculating the pressure difference between the hydraulic data corresponding to the main measuring point and the hydraulic data corresponding to each liquid level verification point.

[0145] Step 804, calculating the actual density value of the liquid according to each arrangement height difference and the corresponding pressure difference, and updating the liquid density according to the actual density value of the liquid.

[0146] Step 805, recalculate the liquid level height according to the updated liquid density.

[0147] In step 801 of some embodiments, the present embodiment determines the role of the measuring point by analyzing the distribution law of the hydraulic data. Since the static pressure of the liquid increases with the depth, the pressure value measured by the optical fiber pressure sensor at the bottom is the largest, and it is determined as the main measuring point. The other optical fiber pressure sensors in the liquid, due to their higher positions, measure relatively small pressure values, and are determined as liquid level calibration points. This measurement point allocation method can fully utilize the advantages of multi-point measurement.

[0148] In step 802 of some embodiments, the arrangement height difference refers to the vertical distance between the main measuring point and each liquid level check point. This height difference is a physical parameter that has been determined when the fixed column is installed. For example, if a sensor is set every 20 cm on the fixed column, the arrangement height difference between adjacent sensors is 20 cm, the height difference with the second sensor is 40 cm, and so on. These known arrangement height differences provide important references for subsequent calculations.

[0149] In step 803 of some embodiments, it is necessary to calculate the pressure difference between the main measuring point and each liquid level check point. According to the principle of fluid statics, this pressure difference is the static pressure of the liquid caused by the height difference. For example, if the pressure measured at the main measuring point is 150kPa and the pressure measured at a certain liquid level check point is 130kPa, then the pressure difference between them is 20kPa. There is a definite functional relationship between this pressure difference and the arrangement height difference.

[0150] In step 804 of some embodiments, based on the pressure formula ΔP=ρgΔh, where ΔP is the pressure difference and Δh is the height difference, the actual density value of the liquid can be inferred as ρ=ΔP / (gΔh). A more accurate density value can be obtained by calculating the data of multiple groups of measuring points. For example, if the pressure difference between two measuring points is 20kPa and the height difference is 2m, the actual density of the liquid can be calculated to be 1020kg / m3, which may be different from the initially preset density value.

[0151] In step 805 of some embodiments, the updated actual density value of the liquid is substituted into the formula P=ρgh to calculate the liquid level. This density correction mechanism based on multi-point measurement can effectively cope with the situation where the liquid density changes and ensure the accuracy of the liquid level calculation. For example, when the impurity content in the waste liquid changes, resulting in a change in density, the system can still maintain a high measurement accuracy.

[0152] Through step 801 to step 805, this embodiment realizes real-time correction of liquid density and accurate calculation of liquid level. This method makes full use of the advantages of multi-point measurement, and overcomes the influence of liquid density change on liquid level measurement by calculating the actual density of the liquid in real time, making the measurement result more reliable.

[0153] See also Fig. 9 The embodiment of the present application further provides a nuclear power plant liquid level detection system 900, which can implement the above-mentioned nuclear power plant liquid level detection method, including:

[0154] A liquid level detection device 910, comprising a fixed column 99, with an optical fiber pressure sensor disposed at each end of the fixed column, and multiple optical fiber pressure sensors disposed between the two optical fiber pressure sensors at the two ends of the fixed column, one end of the liquid level detection device being fixed to the bottom of the liquid storage cavity, and the other end extending out of the liquid storage cavity;

[0155] The host computer 920 is communicatively connected with the liquid level detection device 910, and is used for acquiring a plurality of pressure data through a plurality of optical fiber pressure sensors; determining at least one air pressure data and at least one hydraulic pressure data among the plurality of pressure data; correcting the hydraulic data according to the air pressure data to obtain corrected hydraulic data; and calculating the liquid level height in the liquid storage cavity according to the corrected hydraulic data.

[0156] Specifically, the liquid level detection system 900 of a nuclear power plant includes a liquid level detection device 910 and a host computer 920. The liquid level detection device 910 includes a fixed column 99, and a fiber optic pressure sensor is respectively arranged at both ends of the fixed column 99. In order to achieve multi-point measurement, a plurality of fiber optic pressure sensors are also arranged between the two fiber optic pressure sensors at both ends of the fixed column. This evenly distributed multi-point arrangement enables the system to obtain pressure data at different height positions in the liquid storage cavity. During installation, one end of the liquid level detection device 910 is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity, which not only ensures that the measurement range covers the entire liquid storage cavity, but also facilitates the installation and maintenance of the equipment.

[0157] The host computer 920 is connected to the liquid level detection device 910 in communication and is responsible for data collection and processing. Specifically, the functions of the host computer 920 include: first, multiple pressure data are collected through multiple optical fiber pressure sensors; then, in these pressure data, at least one air pressure data and at least one hydraulic pressure data are determined through numerical value size and change trend analysis; then, the hydraulic pressure data is corrected using the air pressure data to eliminate the influence of the air pressure change in the liquid storage cavity, and the corrected hydraulic pressure data is obtained; finally, according to the corrected hydraulic pressure data, combined with parameters such as liquid density and gravity acceleration, the actual liquid level height in the liquid storage cavity is calculated.

[0158] Through this system structure design, this embodiment realizes accurate measurement of the liquid level of the liquid storage cavity of the nuclear power plant. The system adopts a combination of multi-point pressure measurement and data correction, which can not only cope with changes in liquid density, but also eliminate the influence of air pressure, providing a reliable liquid level monitoring method for the safe operation of the nuclear power plant. The specific implementation method is the same as the aforementioned nuclear power plant liquid level detection method, and will not be repeated here.

[0159] See also Fig.10 In some embodiments, the optical fiber pressure sensor 1000 includes an optical cavity pressure-sensitive element 1010 and a temperature measuring grating element 1020; specifically, the optical cavity pressure-sensitive element 1010 is mainly used to measure pressure. Its working principle is that when external pressure acts on the optical cavity pressure-sensitive element, it will cause the optical cavity to deform. This deformation will change the geometric dimensions of the optical cavity, thereby causing changes in the reflected light signal. By detecting the changes in this light signal, the actual pressure value acting on the optical fiber pressure sensor can be obtained.

[0160] The temperature measuring grating element 1020 is mainly used to measure temperature. Its core is the fiber Bragg grating. When the ambient temperature changes, it will cause the grating period to change, causing the center wavelength of the reflected light signal to drift. By detecting this wavelength drift, the temperature value of the location of the optical fiber pressure sensor can be accurately obtained.

[0161] This design, which integrates pressure measurement and temperature measurement functions into the same sensor, can, on the one hand, achieve synchronous measurement of pressure and temperature; on the other hand, the measured temperature data can be used to perform temperature compensation on pressure measurement, eliminating the influence of temperature changes on pressure measurement, thereby improving measurement accuracy.

[0162] In some embodiments, the optical cavity pressure-sensitive element 1010 is a full quartz film.

[0163] Specifically, the all-quartz film has excellent elastic deformation properties. When external pressure acts, the film will produce a small but measurable deformation. Since the quartz material has a good elastic limit, this deformation can be fully restored after the pressure is eliminated, ensuring the repeatability of the sensor measurement. At the same time, the quartz material has extremely low creep characteristics. Even under long-term pressure, its deformation remains stable, which is crucial for achieving long-term stable pressure measurement.

[0164] In addition, all-quartz material has the following advantages: first, its thermal expansion coefficient is very small, which can reduce the impact of ambient temperature changes on pressure measurement; second, quartz material has excellent chemical stability and can withstand the complex medium environment of nuclear power plants; third, the all-quartz structure is the same as the optical fiber material, which can achieve good optical coupling and reduce the transmission loss of optical signals. These characteristics make all-quartz film an ideal sensitive element material for optical fiber pressure sensors.

[0165] According to the nuclear power plant liquid level detection method of the embodiment of the present application, the method is applied to the power plant liquid level detection system, the liquid level detection system includes a liquid level detection device and a liquid storage cavity, the liquid level detection device includes a fixed column, and an optical fiber pressure sensor is respectively arranged at both ends of the fixed column, and multiple optical fiber pressure sensors are arranged between the two optical fiber pressure sensors at both ends of the fixed column. One end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity. The liquid level detection method includes: collecting multiple pressure data through multiple optical fiber pressure sensors; determining at least one air pressure data and at least one hydraulic pressure data among the multiple pressure data; correcting the hydraulic data according to the air pressure data to obtain corrected hydraulic data; and determining the liquid level height in the liquid storage cavity according to the corrected hydraulic data.

[0166] The present application can realize continuous and stable monitoring of liquid pressure by arranging multiple optical fiber pressure sensors on the fixed column and vertically installing the fixed column in the liquid storage cavity, thereby avoiding the measurement instability problem caused by the liquid surface fluctuation of the float type liquid level gauge. Then, based on the multiple pressure data collected, the air pressure data and the hydraulic pressure data are distinguished, so that they are not affected by the liquid surface foam, and the defect of the ultrasonic liquid level gauge causing measurement deviation due to the foam interference is overcome. Next, by correcting the hydraulic pressure data using the air pressure data, the influence of the air pressure change in the liquid storage cavity on the liquid level measurement can be effectively eliminated, and the accurate acquisition of the real hydraulic pressure can be achieved. Finally, based on the corrected hydraulic pressure data, the liquid level height in the liquid storage cavity can be accurately calculated, and the calculation process is not disturbed by liquid fluctuations and foam, so as to achieve accurate measurement of the liquid level. Compared with the float type liquid level gauge that is susceptible to liquid surface fluctuations and the ultrasonic liquid level gauge that is susceptible to foam interference in the prior art, the method provided in the embodiment of the present application is based on the optical fiber pressure sensor and the air pressure correction mechanism, which can effectively overcome the measurement interference caused by the special application environment of the nuclear power plant and improve the accuracy of the liquid level detection of the nuclear power plant.

[0167] Reference Fig.11 , Fig.11 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0168] The processor 1101 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0169] The memory 1102 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1102 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 1102, and the processor 1101 calls and executes the nuclear power plant liquid level detection method of the embodiment of this application;

[0170] Input / output interface 1103, used to implement information input and output;

[0171] The communication interface 1104 is used to realize the communication interaction between the device and other devices. The communication can be realized through a wired manner (such as USB, network cable, etc.) or a wireless manner (such as mobile network, Wi-Fi, Bluetooth, etc.);

[0172] A bus 1105 that transmits information between various components of the device (e.g., the processor 1101, the memory 1102, the input / output interface 1103, and the communication interface 1104);

[0173] The processor 1101 , the memory 1102 , the input / output interface 1103 and the communication interface 1104 are connected to each other in communication within the device via the bus 1105 .

[0174] The embodiment of the present application further provides a computer program product, which includes a computer program. A processor of a computer device reads and executes the computer program, so that the computer device executes and implements the above-mentioned nuclear power plant liquid level detection method.

[0175] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0176] It should be understood that in the present disclosure, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one item (one) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0177] It should be understood that in the description of the embodiments of the present application, the meaning of multiple (or multiple items) is more than two, greater than, less than, exceed, etc. are understood to not include the number, and above, below, within, etc. are understood to include the number.

[0178] In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0179] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0180] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0181] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0182] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0183] The above is a specific description of the implementation methods of the present disclosure, but the present disclosure is not limited to the above implementation methods. Technical personnel familiar with the art can also make various equivalent modifications or substitutions without violating the spirit of the present disclosure. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present disclosure.

Claims

1. A method for detecting liquid level in a nuclear power plant, characterized in that: The method is applied to a liquid level detection system of a nuclear power plant. The liquid level detection system includes a liquid level detection device and a liquid storage cavity. The liquid level detection device includes a fixed column. An optical fiber pressure sensor is respectively arranged at both ends of the fixed column. A plurality of optical fiber pressure sensors are arranged between the two optical fiber pressure sensors at both ends of the fixed column. One end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity. The liquid level detection method includes: Acquire a plurality of pressure data by collecting the plurality of optical fiber pressure sensors; Determine at least one air pressure data and at least one hydraulic pressure data among the plurality of pressure data; Correcting the hydraulic pressure data according to the air pressure data to obtain the corrected hydraulic pressure data; The height of the liquid level in the liquid storage chamber is determined according to the corrected hydraulic pressure data.

2. The method for detecting liquid level in a nuclear power plant according to claim 1, characterized in that: The collecting and obtaining the plurality of pressure data by the plurality of optical fiber pressure sensors specifically includes: Transmitting incident light signals to the plurality of optical fiber pressure sensors to obtain reflected light signals reflected from the plurality of optical fiber pressure sensors; Performing spectral separation on each of the reflected light signals to obtain a plurality of monochromatic light wavelength signals; Waveform fitting and optical path phase demodulation are performed on each of the monochromatic light wavelength signals to obtain the pressure data.

3. The method for detecting liquid level in a nuclear power plant according to claim 2, characterized in that: The step of performing waveform fitting and optical path phase demodulation on the plurality of monochromatic light wavelength signals to obtain the pressure data comprises: Performing peak recognition on the monochromatic waveform curve of each monochromatic light wavelength signal, and separating the monochromatic waveform curve into a plurality of sub-waveform signals; Performing clipping processing on each of the sub-waveform signals to obtain a plurality of sub-waveform signals after clipping processing; Fitting the sub-waveform signal after the clipping process to obtain a plurality of fitting sub-waveforms; Calculating the corresponding target displacement value according to the optical path phase difference of each of the fitted sub-waveforms; The pressure data is calculated according to each of the target displacement values.

4. The method for detecting liquid level in a nuclear power plant according to claim 2, characterized in that: The optical fiber pressure sensor comprises an optical cavity pressure sensing element and a temperature measuring grating element, the reflected light signal comprises an optical cavity reflection signal and a grating reflection signal, and after emitting incident light signals to the plurality of optical fiber pressure sensors to obtain reflected light signals reflected by the plurality of optical fiber pressure sensors, the method further comprises: Acquiring the grating reflection signal through the temperature measuring grating element; Demodulating the grating reflection signal to obtain target temperature data; The pressure data is corrected according to the target temperature data to obtain the corrected pressure data.

5. The method for detecting liquid level in a nuclear power plant according to claim 1, characterized in that: Determining at least one air pressure data and at least one hydraulic pressure data from among the plurality of pressure data comprises: Acquire the multiple pressure data, and sort the multiple pressure data; Determining pressure data satisfying a preset air pressure characteristic condition among the plurality of pressure data as the air pressure data; The pressure data that is greater than the air pressure data and increases with depth among the plurality of pressure data is determined to be the hydraulic pressure data.

6. The method for detecting liquid level in a nuclear power plant according to claim 1, characterized in that: The step of correcting the hydraulic pressure data according to the air pressure data to obtain the corrected hydraulic pressure data includes: Determining the air pressure in the liquid storage cavity according to the air pressure data; comparing the air pressure in the liquid storage chamber with the atmospheric pressure; In response to the air pressure being greater than the atmospheric pressure, calculating the air pressure difference between the air pressure data and the atmospheric pressure; The hydraulic data is corrected according to the air pressure difference to obtain the corrected hydraulic data.

7. The method for detecting liquid level in a nuclear power plant according to claim 1, characterized in that: The step of calculating the liquid level in the liquid storage chamber according to the hydraulic pressure data comprises: Obtaining the liquid density of the liquid in the liquid storage cavity; Calculating the product of the liquid density and the gravitational acceleration constant; The hydraulic pressure data is divided by the product of the liquid density value and the gravitational acceleration constant to calculate the liquid level height.

8. The method for detecting liquid level in a nuclear power plant according to claim 7, characterized in that: When the hydraulic pressure data is multiple, after obtaining the liquid density of the liquid in the liquid storage chamber, the method further includes: The optical fiber pressure sensor located at the bottom of the liquid is determined as the main measuring point, and the remaining optical fiber pressure sensors in the liquid are determined as liquid level verification points; Obtaining a layout height difference between the main measuring point and each of the liquid level verification points; Calculating the pressure difference between the hydraulic data corresponding to the main measuring point and the hydraulic data corresponding to each of the liquid level verification points; Calculating the actual density value of the liquid according to each of the arrangement height differences and the corresponding pressure difference, and updating the density of the liquid according to the actual density value of the liquid; The liquid level height is recalculated according to the updated liquid density.

9. A liquid level detection system for a nuclear power plant, characterized in that: include: A liquid level detection device, the liquid level detection device comprising a fixed column, each of the two ends of the fixed column is provided with an optical fiber pressure sensor, a plurality of optical fiber pressure sensors are provided between the two optical fiber pressure sensors at the two ends of the fixed column, one end of the liquid level detection device is fixed to the bottom of the liquid storage cavity, and the other end extends out of the liquid storage cavity; A host computer, the host computer is communicatively connected with the liquid level detection device, and is used to collect a plurality of the pressure data through the multiple optical fiber pressure sensors; determine at least one air pressure data and at least one hydraulic pressure data among the multiple pressure data; correct the hydraulic data according to the air pressure data to obtain the corrected hydraulic data; and calculate the liquid level height in the liquid storage cavity according to the corrected hydraulic data.

10. The nuclear power plant liquid level detection system according to claim 9, characterized in that: The optical fiber pressure sensor comprises an optical cavity pressure-sensitive element and a temperature-measuring grating element; the optical cavity pressure-sensitive element is used to measure pressure, and the temperature-measuring grating element is used to measure temperature.

11. The nuclear power plant liquid level detection system according to claim 10, characterized in that: The optical cavity pressure-sensitive element is a full quartz film.

12. An electronic device, characterized in that: include: A memory and a processor, wherein the memory stores a computer program, and the processor implements the nuclear power plant liquid level detection method as claimed in any one of claims 1 to 8 when executing the computer program.

13. A computer-readable storage medium, characterized in that: The storage medium stores a program, and the program is executed by a processor to implement the nuclear power plant liquid level detection method according to any one of claims 1 to 8.

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