Effect of turbulence on laser absorption signal and its improvement method
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1.
Key Laboratory of Environmental Optics&Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
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2.
Key Laboratory of Pulsed Power Laser Technology, Institute of Electronic Engineering, Hefei 230031, China
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Corresponding author:
ZHANG Yu-jun, yjzhang@aiofin.ac.cn
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Received Date:
2011-11-07
Accepted Date:
2012-01-19
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Abstract
When tunable diode laser absorption spectroscopy gas sensor is used in open optical path gas measurement,the laser absorption signal can be influenced by atmospheric turbulence.The amplitude of absorption signal varies with the fluctuation of atmospheric turbulence so that the obtained gas absorption spectrum signal is deformed and the measurement accuracy is affected.In order to improve laser absorption spectrum signal quality impacted by atmospheric turbulence and measurement sensitivity,a method,changing the scan frequency of laser wavelength,was put forward.The variance of average signal between adjacent periods of absorption spectrum was less than 0.1 when the scan frequency of laser wavelength was 2kHz.This method effectively improved the laser absorption spectrum signal quality impacted by atmospheric turbulence.
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