High-sound pressure microphone-oriented amplitude- and frequency-adjustable calibrator with traceability

Abstract

The invention discloses a high-sound pressure microphone-oriented amplitude- and frequency-adjustable calibrator with traceability and belongs to the field of high-sound pressure microphone calibration. The calibrator of the invention comprises a microphone installation structure, a microphone pre-tightening structure, a high-sound pressure absolute closed-loop real-time feedback measurement and control system and a vibration diaphragm system; the vibration diaphragm system includes a replaceable coupling cavity, a vibration diaphragm, and a driver; the replaceable coupling cavity generates uniform sound pressure within a wide frequency range; by means of the vibration of the vibration diaphragm, high sound pressure is generated in the closed coupling cavity; the driver converts electricalenergy into mechanical energy, so that a dynamic force can be generated to drive the vibration diaphragm to produce desired vibration, and high-magnitude-order sound pressure is excited in the air; the high-sound pressure absolute closed-loop real-time feedback measurement and control system controls the amplitude and frequency of the high sound pressure through the closed-loop feedback system according to the quantity value of the dynamic force or dynamic motion which is measured by a dynamic force sensor and an optical sensor, and therefore, it can be ensured that the high sound pressure can reach an expected frequency and amplitude, stable sound pressure output is realized, and the traceability of the sound pressure to fundamental quantities is realized.

Description

technical field [0001] The invention relates to a traceable high sound pressure microphone calibrator with adjustable amplitude and frequency, in particular to a special metering and calibrating device for high sound pressure microphones, which has frequency (0.1Hz~5000Hz) and amplitude (124dB~ 180dB) is continuously adjustable, and can be traced back to basic quantities such as length and time, belonging to the field of high sound pressure microphone calibration. Background technique [0002] At present, the calibration technology of low sound pressure level microphones is very mature, including JJG175 "Verification Regulations for Working Standard Microphones" and JJF1653 "Calibration Regulations for Capacitive Engineering Measurement Microphones", which stipulate the calibration methods and devices for working standard microphones and engineering measurement microphones. Its value transmission and accuracy are also guaranteed. [0003] However, with the increasing demand...

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Problems solved by technology

[0010] Aiming at the following technical problems in the high sound pressure microphone calibrator in the prior art: the standing wave sound field is formed by the loudspeaker in the closed long tube to generate high sound pressure, and its frequency is affected by the standing wave tube, the frequency is single or narrow, and the maximum amplitude The value can only reach 160~174dB, which is calibrated by comparing with the standard microphone, and the source of the high sound pressure standard microphone cannot be traced

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