Real-time calibration acoustic array

Details Real-time calibration acoustic array Real-time calibration acoustic array

1994-12-05

1996-06-25

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

367155, H04B 1700

Patent

active

055306780

ABSTRACT:
A method and apparatus for acoustic array calibration. A housing with an opening on one side contains the acoustic transducer element. An acoustically transparent window covers the opening in the housing. A separate piece of substantially acoustically transparent planar transducer film is positioned in front of each transducer element. This film monitors the acoustic energy transmitted by the transducer elements, or alternatively transmits energy to the transducer elements. The transducer film can also operate as an independent hydrophone.
A method for calibrating acoustic arrays is also disclosed. The transducer film monitors the acoustic energy transmitted by each acoustic transducer. The level of transmitted acoustic energy is independently measured by external calibration equipment. The acoustic energy received by each transducer film is compared with that measured by the external equipment to determine a calibration factor for each transducer element. Further, the transducer film can be energized to send acoustic energy to the transducer elements. Again, the acoustic energy transmitted by the film and received by the transducer elements is compared to the energy transmitted by the external calibration equipment and received by the transducer elements to determine a calibration factor for each transducer element.

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Lewin, Peter A., et al., "Wide-Band Piezoelectric Polymer Acoustic Sources", IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 35, No. 2, Mar. 1988, pp. 175-184.

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