High-temperature calibration device for probe microphone

Abstract

The invention relates to a high-temperature calibration device for a probe microphone, and belongs to the field of acoustic measurement and calibration. In allusion to a special needle shaped structure of the head of the probe microphone and characteristics of the usage in a high temperature environment, a new internally hollow three-way hot plug structure with semi-partitions and a coupling cavity structure for high-temperature calibration are designed, so that the probe microphone is ensured to be consistent with a standard microphone in sound field environment but mutually isolated in temperature field, and the probe microphone can be independently heated and calibrated. Compared with a general calibration device for conventional microphones, the calibration device is specially appliedto the probe microphone, can perform high-temperature calibration on the probe microphone and enables the calibration environment of the probe microphone to be consistent with the actual application environment, thereby improving the accuracy and credibility of a calibration result of the probe microphone.

Description

technical field [0001] The invention relates to a high-temperature calibration device for a probe microphone, which belongs to the field of acoustic measurement calibration. Background technique [0002] At present, calibration techniques such as the coupling cavity reciprocity method or the comparison method for conventional microphones have become increasingly mature. It is also at room temperature, so its calibration device can be used universally, and the calibration accuracy is also guaranteed. [0003] However, the probe microphone is a special type of microphone, and its shape and structure are relatively special. The head is equipped with a probe to probe into the high temperature area for acoustic measurement. There are two problems in its calibration: first, the probe microphone is used in high temperature. Environment, if the calibration is performed in a normal temperature environment, the inconsistency between the calibration and the use environment will reduce...

AI Technical Summary

Problems solved by technology

[0003] However, the probe microphone is a special microphone with a special shape and structure. A probe is installed on the head to probe into the high temperature area for acoustic measurement. There are two problems in its calibration: first, the probe microphone is used in high temperature environment, if the calibration is carried out in a normal temperature environment, the inconsistency between the calibration and the use environment will reduce the accuracy and reliability of the calibration results; second, the probe microphone head has a slender probe, which cannot be used in a conventional coupling cavity. Standard microphones are installed directly and symmetrically, neither can be directly coupled

[0006] In the field of acoustic measurement calibration, among the existing patents or applied technologies, such as CN101895809A, CN102611982A, CN203463653U, etc., most of them focus on the research of acoustic calibration technology, devices or appliances under normal temperature environment, and the purpose is to improve the acoustic calibration technology under normal temperature environment. Accuracy of school calibration, but there is a lack of research on high-temperature environment acoustic calibration

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