Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With time interval measuring means
Patent
1981-02-17
1983-07-05
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With time interval measuring means
73572, 73658, 340683, 376245, G01S 518, G21C 1700
Patent
active
043922147
ABSTRACT:
Sound monitoring device for an industrial installation to detect possible impacts of stray bodies including at least one set of two sound detectors arranged in contact with the wall of the installation or in its vicinity, and a measuring and alarm circuit. The detectors are connected to this measuring circuit which includes a device for measuring the separation in time between the reception of the sound waves at one and the other detector, a comparator for this separation with at least one set of two predetermined values, and an alarm which is triggered if the separation in time falls between the two predetermined values. The invention is particularly useful for surveillance of the primary circuit of a pressurized water nuclear reactor.
REFERENCES:
patent: 3262515 (1966-07-01), Drum
patent: 3798626 (1974-03-01), Weichbrodt et al.
patent: 4009463 (1977-02-01), Vercellotti et al.
patent: 4066969 (1978-01-01), Pearce et al.
Audenard Bernard
Marini Jean
Farley Richard A.
Framatome
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