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Laser gas analyzer

  • US 8,482,735 B2
  • Filed: 02/21/2012
  • Issued: 07/09/2013
  • Est. Priority Date: 02/21/2011
  • Status: Active Grant
First Claim
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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, andan 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.

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