Patent ID: 8482735
Filing Date: 2013-07-09
Classification: G01N

Abstract:
1. A laser gas analyzer comprising: a light source unit including a diode laser that irradiates a gas to be measured with laser light while scanning a wavelength thereof; a detection unit including a light receiving element that detects the laser light having passed through the gas to be measured, a gain-variable amplifier into which an output signal of the light receiving element is input, an A/D converter into which the output signal of the amplifier is input, and an arithmetic processing unit that performs a concentration analysis of the gas to be measured based on output data of the A/D converter; a peak-to-peak detector that detects a peak-to-peak value of the output data of the A/D converter in each scan of the wavelength of the laser light irradiated from the diode laser; and a gain adjustment unit that, when the output signal of the peak-to-peak detector deviates from a preset threshold, adjusts the gain of the amplifier in a direction of bringing the output signal back to within the threshold.