Nippon Mining Co., Ltd.

Kajima Corporation

Haruhisa Goto

Hideo Segawa

Kazunari Naya

Hiroomi Sato

Kazuyuki Sato

Keiichi Miyamoto

A fire sensing system, a process for sensing a fire and an environment monitor are disclosed. The system includes infrared sensors with sensing wavelength bands sensing an infrared radiation from an infrared source. One of the sensing wavelength bands is a CO.sub.2 -molecular resonance radiation wavelength band. The system determines whether a disastrous fire occurs or not on the basis of outputs of the sensors and a change in a ratio of the outputs. The process computes the temperature of the infrared source from a ratio of outputs of infrared sensors with at least two sensing wavelength bands of an infrared radiation from a monitored area, produces the intensity of infrared radiation of either of the bands from the computed temperature and computes a heating area from the intensity and the output of a corresponding infrared sensor. The process determines the progress of a fire. The monitor produces a control signal to an air conditioner or room heater-and-cooler from outputs of sensors and an output of a thermometer.

Fire sensing system, process for sensing fire and environment monitor

Infrared rays radiated from a moving object is converged into a plurality of infrared ray detectors by optical system. Detecting area is instituted by the optical system so as to put the infrared rays into a plurality of the infrared ray detectors with time difference therebetween. Signal processing unit produces a detecting signal when there is a predetermined time difference between signals produced by a plurality of the infrared ray detectors. It is possible to avoid wrong operation which is caused by popcorn noise and a differential noise having a bit of time difference caused by temperature gradient in space. Forming a curved imaginary boundary line, a plurality of detecting zones are disposed at out side and inside of the curved imaginary boundary line to detect the object invading from any direction.

Moving object detector and moving object detecting system

Growing community of inventors

Toda, Japan

Haruhisa Goto