Elastic wave detector

Details Elastic wave detector Elastic wave detector

1971-11-04

1977-01-25

Larkins, William D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

235181, 333 30R, 333 70T, 357 23, 357 26, 357 41, H01L 2720, H01L 2978

Patent

active

040053180

ABSTRACT:
Elastic waves propagating at the surface of a solid may be detected by a change in resistance of a charge inversion region caused by stresses produced by the propagating wave. A field-effect transistor having drain and source regions and a gate electrode is biased through the gate electrode to produce a charge inversion between the drain and source regions. A change in resistance of the charge inversion layer as a result of a stress produced by surface wave (piezoresistance effect) varies the current flow in a circuit connected to the drain region. The varying current flow in the external circuit is related to the propagating wave. To generate a surface wave in a solid, a bulk wave convertor may be employed.

REFERENCES:
patent: 3215981 (1965-11-01), Golay
patent: 3360749 (1967-12-01), Sittig
patent: 3479572 (1969-11-01), Pokorny
patent: 3609252 (1971-09-01), Broce et al.

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