Procedure for monitoring of an object using a signal line, toget

Details Procedure for monitoring of an object using a signal line, toget Procedure for monitoring of an object using a signal line, toget

1988-08-05

1989-05-09

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 324 66, 324534, G08B 2500, G01R 1900

Patent

active

048292842

ABSTRACT:
A multitude of alarm indicators are layed out in a signal line for the purpose of monitoring an extensive object. Such an object can be a large building, a pipeline or similar device. In order to determine which of the alarm indicators has triggered off the alarm, a repeated pulse is fed into the signal line whose echo is compared with a programmed-in echo signal. The programmed echo signal is acquired through the transmission of a pulse when all of the alarm indicators are out of service. By comparison of the programmed-in echo signal with the measured echo signal, the distance of the activated alarm indicator from the beginning of the signal line can be measured.

REFERENCES:
patent: 3031643 (1962-04-01), Sheftelman
patent: 3707709 (1972-12-01), Wolf et al.
patent: 3732562 (1973-05-01), Faber et al.
patent: 4327358 (1982-04-01), Karas
patent: 4423410 (1983-12-01), Galvin et al.
patent: 4450434 (1984-05-01), Nielson et al.
patent: 4571578 (1986-02-01), Karas

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