| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical gas detection method which enables the suppression of the variation of a gas signal due to the variation of a detection signal, and to provide an optical gas detector. <P>SOLUTION: In the optical gas detector equipped with a light source part 2 for sweeping a modulation center wavelength within a predetermined sweep range while modulating the wavelength of a laser beam, an optical system 3 for transmitting the laser beam through an atmosphere to be measured, a light detection part 4 for detecting a detection signal from the light detection signal of transmitted light by phase sensitive detection and a signal processing part 5 for calculating a gas signal from the detection signal, calculating the wave height value of the waveform of the gas signal and detecting the concentration of a predetermined gas in the atmosphere to be measured from the wave height value, the signal processing part 5 divides the gas signal by the divisor value corresponding to the level of the gas signal to calculate the wave height value. <P>COPYRIGHT: (C)2009,JPO&INPIT |
