Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1986-01-29
1987-01-27
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
367150, 367151, 367103, 310335, H04R 134
Patent
active
046399046
ABSTRACT:
A sound transmitter for generation of transient acoustic pulses, comprising a spatially curved focussing emitter surface which is represented by the area of a single active or passive emitter or by the areas of several emitters matched in respect of their period of operation and amplitude. The pulses occurring in the region of the focus are generated by a substantially unipolar and chronologically limited pressure and/or velocity evolution at the emitter surface. So that a substantially unipolar pressure pulse may equally be generated at the focus of an emitter surface of this nature, the emitter surface deviates in a specified manner from an ideally focussing emitter surface so that as a result of the differences in period of operation caused by a real deviation in the region of the focus, the chronological increase and decrease of the velocity potential in the focal region calculable by means of the Rayleigh integral differ in speed, so that the pressure evolution determined from the substantially unipolar evolution of the velocity potential by derivation based on time has a brief pulse of high amplitude at the beginning or end, which is followed or preceded by a longer pulse of lesser amplitude.
REFERENCES:
patent: 4319490 (1982-03-01), Hartmann
Eldred John W.
Jordan Charles T.
Richard Wolf GmbH
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