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Interferometric Microphone Calibrator And Comparison Calibrating A Microphone
Patent Number: 11,956,601
Traditional microphone pressure response calibration methods require mechanically coupling the front part of a microphone, where its diaphragm/membrane is located, to a partially sealed cavity with a small, well-controlled vent. A sound source that is also coupled to the cavity provides an acoustic signal that is used for the calibration. The accuracy of a comparison calibration using this approach is limited, and the need to mechanically couple the microphone to the cavity and sound source can make the calibration process take longer than necessary. Also, microphones could potentially be used in locations where in-situ calibration is desired, but such physical mechanical coupling is not readily achieved or even possible.
Invention
A precision laser-based comparison calibration method for laboratory standard microphones that uses reference microphones calibrated by the pressure reciprocity method.
Commercial Application
There is a significant market for calibrated microphones in safety, health, and other applications. At the present time, these calibrations are done following complex and expensive procedures. This invention could be commercialized as a calibration system that would be used to quickly and simply perform such calibrations.
Finally, this system should be price-competitive with existing secondary calibration systems, while providing the improvements listed above.
Competitive Advantage
The new method provides a significantly reduced uncertainty over the current secondary techniques. In addition, calibrations would be quicker and easier than following the current methods.