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Chinese Optics Letters

Chinese Optics Letters


  • Editor: Zhizhan Xu
  • Vol. 10, Iss. 4 — Apr. 1, 2012
  • pp: 042801–

Novel method for correcting light intensity fluctuation in the TDLAS system

Guojie Tu, Yu Wang, Fengzhong Dong, Hua Xia, Tao Pang, Zhirong Zhang, and Bian Wu  »View Author Affiliations

Chinese Optics Letters, Vol. 10, Issue 4, pp. 042801- (2012)

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A novel method for online correction of light intensity fluctuation in a practical tunable diode laser absorption spectroscopy (TDLAS) system with wavelength modulation is presented. The proposed method is developed according to the linear relation between peaks at multiple frequencies of sine modulation in the power spectral density of the demodulated second-harmonic (2f) signal and the incident light intensity. Those peaks are demonstrated experimentally and explained as residual power at the first-harmonic and third-harmonic frequencies after 2f demodulation of the residual amplitude modulation signal due to the limited integrating time constant of the lock-in-amplifier. This method can achieve real-time correction of light intensity fluctuations with only little calculation. It can work well in a very large range of light intensity and has great potential applications in the wavelength modulation spectroscopy system.

© 2012 Chinese Optics Letters

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.0300) Spectroscopy : Spectroscopy

ToC Category:
Remote Sensing and Sensors

Guojie Tu, Yu Wang, Fengzhong Dong, Hua Xia, Tao Pang, Zhirong Zhang, and Bian Wu, "Novel method for correcting light intensity fluctuation in the TDLAS system," Chin. Opt. Lett. 10, 042801- (2012)

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