Dual line electret transducer

Details Dual line electret transducer Dual line electret transducer

1976-08-30

1977-08-02

Swann, III, Glen R.

Communications: electrical

Systems

Call station

340258R, G08B 1307

Patent

active

040400441

ABSTRACT:
An improved low-cost line transducer comprises a pair of electret covered conductors twisted about each other to form longitudinal helices and mechanically coupled to a medium that transmits mechanical forces transversely of the conductors. A change in the conductor-electret spacing caused by the mechanical disturbance generates an electrical signal between the conductors which is detected and processed by appropriate circuitry for indicating the occurrence of the disturbance. This simplified line transducer has improved sensitivity to the low frequency disturbances because of the non-symmetrical relation of the two conductors throughout their length. Undesired hum and noise picked up by the unshielded line is reduced or eliminated by appropriate circuits in the signal processor.

REFERENCES:
patent: 3763483 (1973-10-01), Burney et al.
patent: 3833897 (1974-09-01), Bell et al.
patent: 3836899 (1974-09-01), Duvall et al.

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