Gas leakage detector using optical fiber

Abstract

Abstract PURPOSE:To detect propane gas, coal gas, etc., at the normal temperature without wrong information by providing a light source emitting infrared light of specific wavelength, a photodetector detecting it, and a reflex mirror reflecting sent light and then by connecting them by bundles of transmitting and receiving optical fibers. CONSTITUTION:Infrared light from light source 1 such as LED emitting monochromatic light of 34mum in absorption wavelength is made to strike transmitting optical fiber 3 via filter 2. The light is reflected by reflex mirror 4 and then strikes receiving optical fiber 5. The reflected light having propagated through receiving optical fiber 5 strikes photodetector 6 such as a thermistor, which converts it into an electric signal. In this case, when propane gas, coal gas, or the like resides in space 7 extending from the transmitting optical fiber to the receiving optical fiber via the reflex mirror, it is absorbed as much as its density. Consequently, the density of the gas can be detected and further since the optical fibers are used, flexibility is provided, so that detection will be possible at a narrow place.

Inventors

• 👤 Yutaka Ohata

Bibliographic Details