Absolute calibration technique for broadband ultrasonic transduc

Details Absolute calibration technique for broadband ultrasonic transduc Absolute calibration technique for broadband ultrasonic transduc

1993-08-31

1994-06-28

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Testing, monitoring, or calibrating

H04B 1700, G01D 1800

Patent

active

053253396

ABSTRACT:
Calibrating an ultrasonic transducer can be performed with a reduced number of calculations and testing. A wide-band pulser is connected to an ultrasonic transducer under test to generate ultrasonic waves in a liquid. A single frequency is transmitted to the electrostatic acoustic transducer (ESAT) and the voltage change produced is monitored. Then a broadband ultrasonic pulse is generated by the ultrasonic transducer and received by the ESAT. The output of the ESAT is amplified and input to a digitized oscilloscope for Fast Fourier Transform. The resulting plot is normalized with the monitored signal from the single frequency pulse. The plot is then corrected for characteristics of the membrane and diffraction effects. The transfer function of the final plot is determined. The transfer function gives the final sensitivity of the ultrasonic transducer as a function of frequency. The advantage of the system is the speed of calibrating the transducer by a reduced number of measurements and removal of the membrane and diffraction effects.

REFERENCES:
patent: 4310906 (1982-01-01), Cantrell, Jr. et al.
patent: 4434648 (1984-03-01), Drost et al.
patent: 4445361 (1984-05-01), Moffett et al.
patent: 4942614 (1990-07-01), Hamilton
Yost et al., Absolute Ultrasonic Displacement Amplitude Measurements with a Submersible Electrostatic Acoustic Transducer, Review of Scientific Instruments, vol. 63, No. 9, pp. 4182-4188, Sep., 1992.

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