Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-04-04
1990-11-20
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340584, 340587, 374119, 374117, G08B 1712
Patent
active
049721780
ABSTRACT:
In a fire monitoring system for monitoring the occurrence of a fire in which a space to be monitored is imaginarily subdivided into plural subspaces so that plural channels passing through the subspaces are set so as to intersect to each other in a lattice form. The propagation speed of ultrasonic waves propagating through each of the channels is measured, on the basis of which the propagation speed of the ultrasonic waves in each of the subspaces is calculated in the same manner as the solution for each element of a matrix is obtained, and then the temperature in each of the subspaces is obtained. By providing the system with a humidity sensor, the temperature for a dry condition is obtained.
REFERENCES:
patent: 4112756 (1978-09-01), MacLennan
patent: 4119950 (1978-10-01), Redding
patent: 4201087 (1980-05-01), Akita et al.
patent: 4215575 (1980-08-01), Akita et al.
patent: 4810100 (1989-03-01), Shavit et al.
Nittan Company Limited
Orsino Joseph A.
Sutcliffe Geoff
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