Method for automatically calibrating sensitivity of microphone of sound monitoring device of power equipment
A technology for power equipment and monitoring devices, which is applied in the field of automatic calibration of microphone sensitivity of power equipment sound monitoring devices, can solve the problem that the calibration of sound monitoring device microphones relies on manual completion by users, and achieves improved measurement accuracy, low technical level, and calibration process convenient effect
Pending Publication Date: 2022-03-11
STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH
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[0004] The present invention proposes a method for automatically calibrating the sensitivity of the microphone of the sound monitoring device of electric power equipment, and its purpose is to solve the problem that the calibration work of the microphone of the sound monitoring device of electric power equipment needs to be manually completed by the user
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Embodiment 1
[0057] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0058] like figure 1 As shown, the steps of the method for automatically calibrating the sensitivity of the microphone of the power equipment sound monitoring device in this embodiment include:
[0059] 1) Connect the sound calibrator to the microphone of the power equipment sound monitoring device;
[0060] 2) Set the power equipment sound monitoring device in the calibration state;
[0061] 3) Select the working frequency of the sound calibrator and the target sound pressure level L eq , and keep the sound calibrator in working condition;
[0062] 4) Collect the voltage signal output by the microphone, calculate the effective value of the voltage signal output by the microphone, according to the default sensitivity S 0 Calculate the first calculated sound pressure level L eq0 ;
[0063] 5) Judging the first calculated sound pressure lev...
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The invention provides a method for automatically calibrating the sensitivity of a microphone of a sound monitoring device of power equipment. The method comprises the following steps of: connecting a sound calibrator with the microphone; selecting the working frequency and the target sound pressure level Leq of the sound calibrator; calculating according to the default sensitivity S0 to obtain a first calculated sound pressure level Leq0; if the first calculation sound pressure level Leq0 is equal to or lower than the target sound pressure level Leq, and the difference value between the target sound pressure level Leq and the first calculation sound pressure level Leq0 is within a set threshold value, calibration is not needed, otherwise, the effective value of the voltage signal output by the microphone is used as the new sensitivity S1 of the microphone; calculating by using the new sensitivity S1 to obtain a second calculated sound pressure level Leq1; if the second calculation sound pressure level Leq1 is equal to or lower than the target sound pressure level Leq, and the difference value between the target sound pressure level Leq and the second calculation sound pressure level Leq1 is within a set threshold value, it is considered that calibration succeeds; according to the invention, the problem that the calibration work of the microphone of the existing power equipment sound monitoring device needs to be completed manually by a user is solved.
Description
technical field [0001] The invention relates to a method for automatically calibrating the sensitivity of a microphone of a sound monitoring device for electric power equipment, and belongs to the technical field of noise detection for electric power equipment. Background technique [0002] The sound monitoring device is the main product to realize the quantitative detection of the running sound of the power equipment. It mainly includes components such as a microphone, a signal conditioning module, an AD acquisition module, a main controller, and a display. The change is converted into an analog electrical signal, and then converted into a digital sound signal after being processed by the signal conditioning module and the AD acquisition module. The main controller calculates the digital sound signal to obtain the sound pressure level; the measurement result of the operating sound of the power equipment is directly related to the sensitivity parameter of the microphone ; Th...
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CPCH04R29/004
Inventor 万新强赖勇张科毛王清韩少华庞吉年赵航宇陈秋平周宇
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD SUQIAN POWER SUPPLY BRANCH