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[Study on wavelength locking technology in trace gases detection system based on laser techniques].

Li-ming Wang¹, Yu-jun Zhang, Ying He

¹Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. wanglm@aiofm.ac.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|June 22, 2012

Summary

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This study presents an adaptive wavelength locking method for tunable diode laser absorption spectroscopy (TDLAS) to improve trace gas detection accuracy. The new method enhances measurement precision and stability for real-time ammonia monitoring.

Area of Science:

Spectroscopy
Environmental Science
Laser Technology

Context:

Trace gas detection systems using tunable diode laser absorption spectroscopy (TDLAS) are susceptible to measurement errors caused by laser wavelength drift due to ambient temperature fluctuations and electronic noise.
Open-path TDLAS systems, specifically for ammonia detection, face challenges in maintaining measurement accuracy and stability.

Purpose:

To analyze the scanning law of laser center wavelength with current in an open-path TDLAS ammonia detection system.
To develop and present an adaptive locking method for the scanning laser center wavelength by controlling laser current.
To study an aligning algorithm for measurement spectroscopy with calibration reference spectroscopy to achieve real-time open-path ammonia concentration measurement.

Summary:

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An adaptive wavelength locking method was developed and applied to an open-path TDLAS ammonia detection system.

The method involves analyzing the laser center wavelength's scanning law with current and implementing an adaptive locking mechanism.

An aligning algorithm for spectroscopy was also studied, enabling real-time ammonia concentration retrieval.

Impact:

The wavelength locking technique significantly improved the precision and stability of trace gas concentration retrieval.
The developed system achieved a detection limit of approximately 3.8 mg x m(-3) x m for ammonia.
Observed diurnal periodicity in ammonia concentration, with peaks during rush hour and noon, highlighting the system's sensitivity to environmental factors.