Intensity acoustic calibrator

Details Intensity acoustic calibrator Intensity acoustic calibrator

1995-05-15

1996-10-22

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

367 13, G01L 2700

Patent

active

055678637

ABSTRACT:
An intensity acoustic calibrator is disclosed including at least two wave guide channels. A speaker adjacent each wave guide channel emits sound to develop a standing wave pattern at the opposing end of the channel. The test microphone is positioned in the calibrator so as to be in acoustic communication with the wave guide channel so that the microphone can be calibrated respective to the standing wave pattern. By having two separate wave guide channels and speakers, the test microphones can be subjected to arbitrary magnitude changes and phase differentials. Additionally, a reference microphone may be positioned adjacent each wave guide channel to monitor the sounds generated by the speakers to ensure that the speakers are emitting sounds at the desired magnitude, phase, etc.

REFERENCES:
patent: 3659255 (1972-04-01), Trott
patent: 3828282 (1974-08-01), Endersz
patent: 4039767 (1977-08-01), Leschek
patent: 4205394 (1980-05-01), Pickens
patent: 4506539 (1985-03-01), Hessler
patent: 4715219 (1987-12-01), Frederiksen
patent: 5029477 (1991-07-01), Bambara
patent: 5210718 (1993-05-01), Bjelland et al.
patent: 5251469 (1993-10-01), Chan

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