System and method for verifying and evaluating optical performance of partial discharge optical sensor based on integral spectrophotometry

Abstract

The invention discloses a system and a method for verifying and evaluating the optical performance of a partial discharge optical sensor based on integral spectrophotometry, and the optical sensor is used for capturing an optical signal generated in a partial discharge process, and converting the optical signal into an electric signal; secondly, the optical signals are processed through an integral spectrophotometry, and optical parameters such as luminous flux, spectral distribution and light intensity are calculated; and then, based on an algorithm in the data acquisition and processing unit, the response characteristic, the sensitivity and the measurement precision of the optical sensor are evaluated. According to the technical scheme, all-around performance verification and accurate evaluation of the partial discharge optical sensor can be achieved, the detection precision and reliability of the optical sensor in complex power equipment are improved, and the method has wide application prospects.

Description

Technical Field

[0001] The present invention relates to the technical field of optical sensors, and in particular to a system and method for verifying and evaluating the optical performance of a partial discharge optical sensor based on an integral photometry method. Background Art

[0002] Partial discharge (PD) is a common and serious insulation failure phenomenon in high-voltage electrical equipment. It is a discharge phenomenon that occurs under the action of an electric field and is common inside high-voltage power equipment such as cables, transformers, and switchgear. Partial discharge is an early sign of deterioration of power equipment. Long-term partial discharge will gradually weaken the insulation performance of electrical equipment, and may eventually lead to insulation breakdown of the equipment, seriously threatening the safe operation of the power system. Therefore, early monitoring and diagnosis of partial discharge are of great significance. Since partial discharge is a hidden process and is not easy to detect through conventional electrical tests, the detection and monitoring of partial discharge has become an important part of the maintenance and operation of power equipment.

[0003] Traditional partial discharge detection technologies mainly include electrical detection, ultrasonic detection, ultra-high frequency (UHF) detection and optical detection. In recent years, optical detection has been widely used in partial discharge monitoring because it has the advantages of non-contact detection, anti-electromagnetic interference and fast response speed by capturing ultraviolet or visible light signals generated by partial discharge.

[0004] In optical sensors, the accuracy of optical performance directly affects the accuracy of partial discharge detection. However, due to the weakness and complexity of partial discharge optical signals, higher requirements are placed on the performance of optical sensors. The optical performance of partial discharge optical sensors includes multiple key indicators such as sensitivity to light signals of different wavelengths, response time, signal-to-noise ratio, dynamic range, etc. Traditional sensor evaluation methods mostly use laboratory qualitative tests and lack systematic quantitative analysis. Especially in complex electromagnetic environments, the stability and accuracy of sensor performance are difficult to guarantee. This evaluation method often relies on experience, and the test results are not comprehensive and accurate, which makes it difficult to meet the high-precision monitoring needs in practical applications.

[0005] The performance verification technology of partial discharge optical sensors based on the integral photometry method provides a new solution for the quantitative evaluation of the optical performance of sensors. The integral photometry method can accurately measure the total energy and intensity of the optical signal by integrating the optical signal output by the sensor, and is particularly suitable for capturing and analyzing complex optical signals. However, although the integral photometry method has been applied to optical performance evaluation, the research on sensor performance verification and evaluation in partial discharge detection is still insufficient, and the following problems still exist: Accurate capture and analysis of optical signals: During partial discharge, optical signals are usually weak and fluctuate frequently. How to improve the sensor's ability to capture weak optical signals and ensure the authenticity of the signal under noise interference remains a challenge.

[0006] Accuracy and adaptability of the calibration algorithm: Existing optical sensor calibration methods are mostly empirical formulas in terms of algorithms, lacking a scientific and systematic calibration process. Especially under complex working conditions, how to ensure the adaptability and accuracy of the calibration algorithm is a core issue that needs to be solved.

[0007] Lack of performance evaluation standards: The performance evaluation indicators of partial discharge optical sensors are diverse, and the existing evaluation system is not perfect and cannot fully reflect the performance of sensors in different application scenarios. It is urgent to establish a scientific and standardized evaluation system. Summary of the invention

[0008] The optical performance calibration system of partial discharge optical sensor based on integral photometry proposed in this invention aims to provide a high-precision and high-reliability optical sensor calibration and evaluation scheme for detecting and analyzing the sensor performance of optical signals in the partial discharge process. The system realizes quantitative analysis of the optical performance indicators of the sensor through integral photometry, including key parameters such as optical sensitivity, response time, signal-to-noise ratio, and linearity.

[0009] In order to achieve the above object, the present invention is implemented through the following technical solutions: A partial discharge optical sensor optical performance verification and evaluation system based on integral photometry, comprising: A light source system for generating standardized optical signals to simulate optical signals of different wavelengths and intensities generated during partial discharge; An integrating sphere system, used to evenly reflect the light from the light source onto the optical sensor; A calibration sensor module, used to convert light signals received by the optical sensor into electrical signals and transmit these signals to a signal processing system; The signal processing system is used to process and analyze the optical signals collected by the sensor.

[0010] Furthermore, the integrating sphere system includes an inner wall of an integrating sphere coated with a high-reflectivity material and a light detection port. The light detection port is arranged on the surface of the integrating sphere, and there are one or more light detection ports, all of which are connected to an optical sensor for collecting light signals received by the optical sensor.

[0011] Furthermore, the light source system comprises: An adjustable light source module for emitting light of various wavelengths; A light intensity adjustment module is used to adjust the light intensity of the light source and simulate light signals with different energy levels during partial discharge; The beam shaping and calibration module adjusts the divergence of the light beam through the beam shaper to make the light signal irradiating the sensor evenly distributed.

[0012] Further, the calibration sensor module includes: The adjustable sensor mounting frame is used to install and adjust multiple optical sensors at different positions to accommodate optical sensors of different models and structures for testing.

[0013] Furthermore, the signal processing system comprises: Signal amplifier and filter, used to amplify the output signal and filter out noise interference; Analog-to-digital converter, used to convert analog signals into digital signals; Data processing and analysis software processes signals through preset algorithms and analyzes the performance parameters of sensors.

[0014] Furthermore, it also includes a control and calibration module for overall control of the light source system, integrating sphere system, calibration sensor module and signal processing system, setting and adjusting the spectrum, intensity and duration of the light source, controlling the working state of the optical sensor, and adjusting the system parameters in real time.

[0015] Furthermore, the data processing and analysis software includes: a sensitivity analysis module, a signal-to-noise ratio measurement module, a linearity test module, and a response time measurement module.

[0016] A method for verifying and evaluating the optical performance of a partial discharge optical sensor based on an integral photometry method comprises the following steps: Pre-calibrate the optical sensor using a standard light source to determine its response sensitivity under different light intensities; Capture the light signal in the partial discharge process through the optical sensor and convert it into an electrical signal; Use the integral photometry method to process the optical signal and calculate the optical parameters; The performance of the optical sensor is evaluated based on the comparison of the calculated optical parameters with standard reference values.

[0017] Further, the response sensitivity analysis includes: Spectral analysis technology is used to separate the different wavelength components in the partial discharge optical signal to evaluate the sensor's response ability in different spectral ranges. Defined as: The input light intensity is , the optical sensor output voltage is , is the wavelength; Sensitivity calibration, the calculation formula of sensitivity S is as follows: Among them, the output voltage of the optical sensor is , is the output voltage change rate of the optical sensor, and the input light intensity is , is the input light intensity The rate of change of Linearity test, Verify input light intensity With output voltage Whether it satisfies the linear relationship: in, is the proportionality coefficient, The output voltage under different input light intensities is measured and the linear equation parameters are obtained by least squares fitting. and , and calculate the linearity error.

[0018] Furthermore, optical parameters include light intensity, spectrum and luminous flux.

[0019] The beneficial effects of the present invention are: The present invention is mainly used to evaluate and verify the key optical properties of optical sensors used for partial discharge monitoring of high-voltage electrical equipment, such as spectral response, sensitivity and linearity. This technology belongs to the field of high-precision optical detection and measurement technology, and combines optical engineering, electrical engineering and measurement technology, and is widely used in condition monitoring and fault diagnosis of power system equipment.

[0020] This calibration technology based on the integral photometry method can effectively improve the detection accuracy and reliability of the sensor by introducing an integrating sphere system and a high-precision spectrometer to accurately analyze the output signal of the optical sensor. It is applicable to various types of partial discharge optical sensors and provides a strong technical guarantee for the application of optical sensors in high-voltage environments.

[0021] The method of the present invention can effectively improve the optical performance calibration accuracy of partial discharge optical sensors and ensure their stability and reliability in complex environments. Compared with traditional photometric measurement methods, the present invention provides a more comprehensive performance evaluation mechanism, which is suitable for the calibration and evaluation of various types of optical sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a flow chart of a method for verifying and evaluating the optical performance of a partial discharge optical sensor based on the integral photometry method according to Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] Example 1 This embodiment discloses a partial discharge optical sensor optical performance verification and evaluation system based on the integral photometry method, comprising: A light source system for generating standardized optical signals to simulate optical signals of different wavelengths and intensities generated during partial discharge; An integrating sphere system, used to evenly reflect the light from the light source onto the optical sensor; A calibration sensor module, used to convert light signals received by the optical sensor into electrical signals and transmit these signals to a signal processing system; A signal processing system, used to process and analyze the optical signals collected by the sensor; The control and calibration module is used to control the light source system, integrating sphere system, calibration sensor module and signal processing system as a whole, set and adjust the spectrum, intensity and duration of the light source, control the working state of the optical sensor, and adjust the system parameters in real time.

[0025] The integrating sphere system includes an inner wall of an integrating sphere coated with a high reflectivity material and a light detection port. The light detection port is arranged on the surface of the integrating sphere. There are one or more light detection ports, all of which are connected to an optical sensor for collecting light signals received by the optical sensor.

[0026] The light source system includes: An adjustable light source module for emitting light of various wavelengths; A light intensity adjustment module is used to adjust the light intensity of the light source and simulate light signals with different energy levels during partial discharge; The beam shaping and calibration module adjusts the divergence of the light beam through the beam shaper to make the light signal irradiating the sensor evenly distributed.

[0027] The calibration sensor module includes: The adjustable sensor mounting frame is used to install and adjust multiple optical sensors at different positions to accommodate optical sensors of different models and structures for testing.

[0028] The signal processing system includes: Signal amplifier and filter, used to amplify the output signal and filter out noise interference; Analog-to-digital converter, used to convert analog signals into digital signals; The data processing and analysis software processes the signal through the preset algorithm and analyzes the performance parameters of the sensor. The data processing and analysis software includes: sensitivity analysis module, signal-to-noise ratio measurement module, linearity test module, and response time measurement module.

[0029] Example 2 The construction of the system includes the following core parts: Integrating sphere: A high-reflectivity integrating sphere is used, and the inner wall is coated with a highly reflective material to evenly scatter and capture the incident light signal.

[0030] The integrating sphere diameter is selected to be of appropriate size to ensure that it can accommodate different types of partial discharge optical sensors.

[0031] Standard light source: A standard light source with high stability and adjustable spectral output is selected to provide an optical signal with known light intensity and spectral distribution.

[0032] The light output of a standard light source must be accurately calibrated to serve as a reference for sensor calibration.

[0033] Spectrum Analyzer: Connected to the output end of the integrating sphere, it is responsible for collecting the light signal received by the sensor and analyzing its spectrum.

[0034] The measurement accuracy of the spectrum analyzer should meet the calibration requirements and be able to accurately distinguish the light intensity of different wavelengths.

[0035] Data acquisition and processing module: The module includes a data acquisition card and data processing software, which are used to collect, store and process the signals output by the spectrum analyzer and the sensor.

[0036] Data processing software should have functions such as data fitting, algorithm calculation, and error analysis.

[0037] The experimental steps include: Sensor preprocessing: Install the sensor to be tested at a specific position in the integrating sphere, making sure that the light receiving end of the sensor is aligned with the inner wall of the integrating sphere.

[0038] Connect the signal output of the sensor to the data acquisition card.

[0039] Standard light source calibration: Start the standard light source and record the light intensity of its output using a spectrum analyzer.

[0040] Make sure the output of the standard light source is stable and its spectral range covers the operating wavelength range of the sensor.

[0041] Spectral response measurement: Turn on the standard light source and the integrating sphere will evenly distribute the light signal on the light receiving surface of the sensor.

[0042] Data processing and evaluation: All measurement data are input into the data processing software to generate the sensor's spectral response curve, sensitivity curve and linearity evaluation results.

[0043] Determine whether the sensor has passed the calibration based on the optical performance evaluation index.

[0044] Example 3 Light intensity analysis includes the following steps: The light intensity of its output is recorded by a spectrum analyzer , is the wavelength.

[0045] Analysis of response sensitivity includes: Spectral analysis technology is used to separate the different wavelength components in the partial discharge optical signal to evaluate the sensor's response ability in different spectral ranges. Defined as: The input light intensity is , the optical sensor output voltage is .

[0046] Sensitivity calibration, the calculation formula of sensitivity S is as follows: Among them, the output voltage of the optical sensor is , is the output voltage change rate of the optical sensor, and the input light intensity is , is the input light intensity The rate of change.

[0047] Linearity test, Verify input light intensity With output voltage Whether it satisfies the linear relationship: in, is the proportionality coefficient, The output voltage under different input light intensities is measured and the linear equation parameters are obtained by least squares fitting. and , and calculate the linearity error.

[0048] By implementing the method of the present invention through the above steps, the following results were obtained: Spectral response curve: At different wavelengths, the response curve of the sensor has good continuity and consistency, indicating that the sensor has high sensitivity to light signals of different wavelengths.

[0049] Sensitivity curve: The sensitivity of the sensor remained stable after calibration, and the error was within the allowable range, verifying the reliability of the standard light source.

[0050] Linearity test: The linear equation parameters obtained by least squares fitting and This indicates that there is a good linear relationship between the sensor output and the input light intensity.

[0051] By processing the collected spectral response, sensitivity and linearity data, analyzing the sensitivity of the sensor at different wavelengths according to the spectral response curve, determining whether the sensitivity satisfies a linear relationship, and evaluating the overall optical performance of the sensor, if the optical performance of the sensor meets specific evaluation indicators, it is determined that it has passed the calibration. The method of the present invention can effectively improve the optical performance calibration accuracy of the partial discharge optical sensor and ensure its stability and reliability in complex environments. Compared with traditional photometric measurement methods, the present invention provides a more comprehensive performance evaluation mechanism, which is suitable for the calibration and evaluation of various types of optical sensors.

[0052] Example 4 On the basis of the system described in the above embodiment, the following may also be added: A computer terminal, for receiving the analysis results from the data processing unit and evaluating the optical performance of the sensor based on a preset standard; A data storage module, used for storing optical performance data during calibration and evaluation; Display module, used to display the calibration and evaluation results of optical sensors in real time, including parameters such as luminous flux, spectral distribution and sensitivity; The wireless communication module is used to send the evaluation results to the remote monitoring platform to realize remote monitoring and maintenance of the optical sensor.

[0053] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A partial discharge optical sensor optical performance calibration and evaluation system based on integral photometry, characterized in that: include: A light source system for generating standardized optical signals to simulate optical signals of different wavelengths and intensities generated during partial discharge; An integrating sphere system, used to evenly reflect the light from the light source onto the optical sensor; A calibration sensor module, used to convert light signals received by the optical sensor into electrical signals and transmit these signals to a signal processing system; The signal processing system is used to process and analyze the optical signals collected by the sensor.

2. The optical performance verification and evaluation system of partial discharge optical sensor based on integral photometry according to claim 1 is characterized in that: The integrating sphere system includes an inner wall of an integrating sphere coated with a high reflectivity material and a light detection port. The light detection port is arranged on the surface of the integrating sphere, and there are one or more light detection ports, all of which are connected to an optical sensor for collecting light signals received by the optical sensor.

3. The optical performance verification and evaluation system of partial discharge optical sensor based on integral photometry according to claim 1 is characterized in that: The light source system comprises: An adjustable light source module for emitting light of various wavelengths; A light intensity adjustment module is used to adjust the light intensity of the light source and simulate light signals with different energy levels during partial discharge; The beam shaping and calibration module adjusts the divergence of the light beam through the beam shaper to make the light signal irradiating the sensor evenly distributed.

4. The optical performance verification and evaluation system for partial discharge optical sensors based on integral photometry according to claim 1 is characterized in that: The calibration sensor module comprises: The adjustable sensor mounting frame is used to install and adjust multiple optical sensors at different positions to accommodate optical sensors of different models and structures for testing.

5. The optical performance verification and evaluation system of partial discharge optical sensor based on integral photometry according to claim 1 is characterized in that: The signal processing system comprises: Signal amplifier and filter, used to amplify the output signal and filter out noise interference; Analog-to-digital converter, used to convert analog signals into digital signals; Data processing and analysis software processes signals through preset algorithms and analyzes the performance parameters of sensors.

6. The optical performance verification and evaluation system of partial discharge optical sensor based on integral photometry according to claim 1 is characterized in that: It also includes a control and calibration module for overall control of the light source system, integrating sphere system, calibration sensor module and signal processing system, setting and adjusting the spectrum, intensity and duration of the light source, controlling the working state of the optical sensor, and adjusting system parameters in real time.

7. The optical performance verification and evaluation system for partial discharge optical sensors based on the integral photometry method according to claim 5 is characterized in that: The data processing and analysis software includes: a sensitivity analysis module, a signal-to-noise ratio measurement module, a linearity test module, and a response time measurement module.

8. A method for verifying and evaluating the optical performance of a partial discharge optical sensor based on integral photometry, characterized in that: Includes steps: Pre-calibrate the optical sensor using a standard light source to determine its response sensitivity under different light intensities; Capture the light signal in the partial discharge process through the optical sensor and convert it into an electrical signal; Use the integral photometry method to process the optical signal and calculate the optical parameters; The performance of the optical sensor is evaluated based on the comparison of the calculated optical parameters with standard reference values.

9. According to the method for verifying and evaluating the optical performance of a partial discharge optical sensor based on the integral photometry method of claim 8, the analysis of the response sensitivity comprises: Spectral analysis technology is used to separate the different wavelength components in the partial discharge optical signal to evaluate the sensor's response ability in different spectral ranges. Defined as: The input light intensity is , the optical sensor output voltage is , is the wavelength; Sensitivity calibration, the calculation formula of sensitivity S is as follows: Among them, the output voltage of the optical sensor is , is the output voltage change rate of the optical sensor, and the input light intensity is , is the input light intensity The rate of change of Linearity test, Verify input light intensity With output voltage Whether it satisfies the linear relationship: in, is the proportionality coefficient, The output voltage under different input light intensities is measured and the linear equation parameters are obtained by least squares fitting. and , and calculate the linearity error.

10. The method for verifying and evaluating the optical performance of a partial discharge optical sensor based on integral photometry according to claim 8, wherein the optical parameters include light intensity, spectrum and luminous flux.

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