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Proceedings Paper

Noise estimation technique to reduce the effects of 1/f noise in Open Path Tunable Diode Laser Absorption Spectrometry (OP-TDLAS)
Author(s): Israa L. Mohammad; Gary T. Anderson; Youhua Chen
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Paper Abstract

Many techniques using high frequency modulation have been proposed to reduce the effects of 1/f noise in tunable diode-laser absorption spectroscopy (TDLAS). The instruments and devices used by these techniques are not suitable for space applications that require small, low mass and low power instrumentation. A new noise estimation technique has already been proposed and validated for two lasers to reduce the effect of 1/f noise at lower frequencies. This paper extends the noise estimation technique and applies it using one distribution feedback (DFB) laser diode. In this method a DFB laser diode is excited at two slightly different frequencies, giving two different harmonics that can be used to estimate the total noise in the measurement. Simulations and experimental results on ammonia gas validate that the 1/f noise is effectively reduced by the noise estimation technique using one laser. Outdoor experimental results indicate that the effect of 1/f noise is reduced to more than 1/4 its normal value.

Paper Details

Date Published: 5 June 2014
PDF: 7 pages
Proc. SPIE 9113, Sensors for Extreme Harsh Environments, 91130S (5 June 2014); doi: 10.1117/12.2063662
Show Author Affiliations
Israa L. Mohammad, Univ. of Arkansas at Little Rock (United States)
The Univ. of Mustansiriyah (Iraq)
Gary T. Anderson, Univ. of Arkansas at Little Rock (United States)
Youhua Chen, Univ. of Arkansas at Little Rock (United States)

Published in SPIE Proceedings Vol. 9113:
Sensors for Extreme Harsh Environments
Debbie G. Senesky; Sachin Dekate, Editor(s)

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