Acoustic transducer using phase shift interference

Details Acoustic transducer using phase shift interference Acoustic transducer using phase shift interference

1996-02-03

1996-01-23

Dougherty, Thomas M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310322, H01L 4108

Patent

active

054867347

ABSTRACT:
A transducer device includes delay sections for creating a phase differential of acoustic waves. The delay sections are spaced apart by sections having an absence of delay. In a preferred embodiment, the phase differential is 180.degree., so that constructive and destructive interference of pressure waves function occurs to reduce the ringdown time of the transducer device. In the preferred embodiment, the array of delay sections is at the back surface of a piezoelectric element. However, delay sections may be at the front, radiating surface of the piezoelectric element for control of the shape of emitted pulses. Vectorial summation of wave energy cancels unwanted energy that is present as a result of reverberations within the transducer device. Alternative delay structures or multiple delay sections can be used to control the transducer impulse response.

REFERENCES:
patent: 4507582 (1985-03-01), Glenn
patent: 4751420 (1988-06-01), Gebhardt et al.
patent: 4800316 (1989-01-01), Ju-Zhen
Hossack, J. A., et al., "Multiple Layer Transducers for Broadband Applications," 1991 Ultrasonics Symposium, IEEE, pp. 605-610.

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