| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser type gas analyzer capable of stably and accurately measuring gas concentration by automatically correcting deviation in an emission wavelength of a laser device without a reference gas cell about gas to be measured that does not exist in the air or exists only in a trace amount in the air.SOLUTION: Gas to be measured that indicates a certain absorption intensity or larger during measurement at each constant cycle is used to obtain a deviation width of an output wavelength of a synchronous detection section. A deviated wavelength is corrected by changing the temperature of a laser device. With this method, an error in concentration due to wavelength change can be prevented without the need of a reference gas cell, thereby achieving long-term stability.</p> |
