LASER ABSORPTION SPECTRAL DIFFRACTION TYPE GAS DETECTOR AND METHOD FOR GAS DETECTION USING LASER ABSORPTION SPECTRAL DIFFRACTION

摘要

A laser absorption spectral diffraction type gas detector light source device with reduced size and weight, comprising a light source device, a light receiver, and a concave mirror disposed in a cabinet, the concave mirror further comprising a reflecting surface for reflecting and condensing, to a specified light condensing position, the laser beam emitted from the light source device to the outside and returned through the light transmitting part after being reflected by an object having a property to reflect the light present in the advancing direction of the laser beam, wherein the laser beam having a beam component with a wavelength corresponding to an absorbing spectrum of detected gas is emitted to the outside through the light transmitting part, and the light receiver disposed at the concave mirror light condensing position in the cabinet receives the laser beam returned through the light transmitting part and outputs an electric signal for detecting the presence or absence of the detected gas at the front of the object according to the attenuance of the light component with a wavelength corresponding to the absorbing spectrum of the detected gas.