Transceiver with skewed transducers for low close-in sensitivity

Details Transceiver with skewed transducers for low close-in sensitivity Transceiver with skewed transducers for low close-in sensitivity

1976-11-04

1979-01-09

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

325 15, 340 1R, 340558, 343 5PD, G08B 1324, G01S 900

Patent

active

041341104

ABSTRACT:
An intruder detection transceiver in which close-in sensitivity is reduced or eliminated to alleviate false alarm problems. An ultrasonic or microwave transceiver contains a transmitter and receiver for transmitting and receiving signals for intruder detection. By mounting the transmitter and receiver at the proper angle with respect to each other, close in sensitivity is reduced without materially affecting sensitivity at greater distances.

REFERENCES:
patent: 2641755 (1953-06-01), Bartelink
patent: 3096515 (1963-07-01), McLeod, Jr.
patent: 3394342 (1968-07-01), Walker
patent: 3412402 (1968-11-01), Beckwith
patent: 3778823 (1973-12-01), Sato et al.
patent: 3815131 (1974-06-01), Dautel et al.
patent: 3854132 (1974-12-01), Davies

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