Microphone High Temperature Calibration System Based on Optical Method
A technology for calibrating systems and microphones, applied in the direction of electrical components, etc., can solve problems such as the inability to meet the needs of microphone calibration, and achieve the effect of flexible adjustment and meeting calibration needs
Active Publication Date: 2020-10-16
NAT INST OF METROLOGY CHINA
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[0007] In view of this, the embodiment of the present invention provides a high-temperature calibration system for microphones based on optical methods to solve the need for microphone calibration that cannot be met under high-temperature conditions in the prior art
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[0046] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
[0047] The current standard microphone calibration methods, including electrostatic excitation method and coupled cavity / free field comparison method, are not suitable for high temperature environments; and the optical method of air sound pressure reproduction and microphone calibration with the sound tube as the measurement object are all performed in a normal temperature environment. In addition...
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The invention is applicable to the technical field of microphone calibration, and relates to a microphone high-temperature calibration system based on an optical method, which comprises an optical device, a high-temperature plane wave sound field generating device, a scattered light receiving and photoelectric conversion device, an oscilloscope and a computer; a microphone to be calibrated is arranged in the high-temperature plane wave sound field generating device; the high-temperature plane wave sound field generation device is used for forming a high-temperature environment and a plane wave sound field; the optical device introduces two interference light beams with an adjustable included angle, converges the light beams at an optical measurement point, receives scattered light at the optical measurement point, performs photoelectric conversion processing to generate an electric pulse, and obtains a sound mass point vibration speed through autocorrelation demodulation and calculation of the electric pulse; calculating is carriee ouit to obtain the sound pressure sensitivity according to the sound mass point vibration speed and other conditions. The microphone sound pressure sensitivity calibration system realizes microphone sound pressure sensitivity calibration based on an optical method under a high-temperature condition; and the dynamic range of sound pressure measurement can be flexibly adjusted, and the calibration requirement of the microphone sound pressure response linearity is met.
Description
technical field [0001] The invention belongs to the technical field of microphone calibration, and in particular relates to a microphone high-temperature calibration system based on an optical method. Background technique [0002] Microphones are the basic sensors for routine acoustic testing such as noise measurement, and their typical applications in high-temperature environments include automotive and aircraft engine testing, pump analysis, HVAC testing, and more. At present, the operating temperature of mature commercial microphone products can reach 300°C, so it is necessary to calibrate the sound pressure sensitivity of the microphone in a high-temperature working environment to ensure the reliability of noise measurement. [0003] There are several methods for microphone calibration in the prior art, including electrostatic excitation method, coupling cavity / free field comparison method, and optical method microphone calibration; however, there are defects in the exis...
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IPC IPC(8): H04R29/00
CPCH04R29/00
Inventor 冯秀娟何龙标牛锋钟波杨平
Owner NAT INST OF METROLOGY CHINA