Ultra reliable infrared absorption water vapor detection through the all-electronic feedback stabilization

Zhu, Cunguang; Chang, Jun; Wang, P.P.; Wang, Q.; Wei, Wei; Tian, Junqiang; Chang, Hengtai; Liu, X.Z; Zhang, S.S.

doi:10.1016/j.optcom.2013.11.011

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…Single-beam systems have been proposed for water vapor sensing for years, but light power drift has a strong impact on detection system reliability. Many works have been performed around a singlebeam optical structure for suppressing the light power drift as mentioned in [6,17], whose advantages and disadvantages have been discussed compared with the single-beam method proposed in this paper. A dual-beam difference system can suppress the influence from light power drift in common mode, but some factors, such as thermal fluctuations, will make changes in reference and signal beams different from each other and cause measurement error.…”

Section: Resultsmentioning

confidence: 99%

“…This method can increase the signal-to-noise ratio but perform poorly in terms of power fluctuation suppression. Then a singlebeam balanced radiometric detection (BRD) system with all-electronic feedback stabilization is proposed for high-reliability water vapor detection, which is insensitive to the fluctuation of transmission loss of light [6]. Later, a technique using automatic photoelectric conversion gain control is proposed to promote the power fluctuation suppression characteristics in a single-beam system [17].…”

Section: Discussionmentioning

confidence: 99%

“…Later, a technique using automatic photoelectric conversion gain control is proposed to promote the power fluctuation suppression characteristics in a single-beam system [17]. In this paper, we propose a creative algorithm based on the head-tail technique applied in a single-beam optical structure that performs as excellently as the previous techniques [6,17], as mentioned above. It has been verified that the single-beam method is more suitable for water vapor detection than the dual-beam subtraction method under rough environmental conditions, according the experiments.…”

Section: Discussionmentioning

confidence: 99%

“…The subtraction demodulation method has been commonly employed in the TDLAS technique, which is effective due to its common mode noise suppression characteristics [6]. However, light power drift also has a strong impact on a detection system's reliability.…”

Section: Introductionmentioning

confidence: 99%

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Demodulation algorithm used in single-beam system immune to light power drift

et al. 2015

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A demodulation algorithm based on the head-tail technique is proposed for single-beam water vapor detection under rough environmental conditions, which is immune to fluctuations of light power. In the head-tail technique, collected data are processed by adding the head and tail data together and gradually approaching the center. The majority of photocurrent attenuation caused by optical loss can be effectively compensated by combining an optical intensity normalization coefficient in the method. The experiment indicates that, when the light power attenuates 4%, the deviation in a single-beam system is 1.29%, which is obviously superior to a dual-beam subtraction system whose deviation is 8.45%. The connection and advantages compared to a previous single-beam detection system have been discussed. The whole arrangement is simply designed without a beam splitter, of which the reliability and validity are fully verified by the experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Demodulation algorithm used in single-beam system immune to light power drift

et al. 2015

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Single-beam water vapor detection system with automatic photoelectric conversion gain control

Zhu

Chang

Wang

et al. 2014

Optics Communications

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Dual-logarithmic demodulation method application in a wide gas optical thickness range

et al. 2021

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Direct absorption spectroscopy (DAS) is an extremely practical and effective technology to detect gas concentration in site applications. Dual-beam subtraction is one of the most common demodulation methods in DAS, yet this method cannot solve the problem of absolute absorption curve nonlinearization in a wide optical thickness range. A real-time and practical dual-logarithmic demodulation method is proposed and proved to be robust when the optical thickness is much greater than linear region. Moreover, the error of optical thickness peak is only 1.18% between the dual-logarithmic demodulation system and simulation after correcting the dual-beam subtraction demodulation system under a 300 K, 1 atm, and 3 m absorption path. When the range of optical thickness peak of acetylene is from 0.0252 to 2.5335 at 1532.83 nm, the peak voltages always maintain satisfactory linearity ( R - s q u a r e = 0.9989 ).

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Ultra reliable infrared absorption water vapor detection through the all-electronic feedback stabilization

Cited by 3 publications

References 14 publications

Demodulation algorithm used in single-beam system immune to light power drift

Demodulation algorithm used in single-beam system immune to light power drift

Single-beam water vapor detection system with automatic photoelectric conversion gain control

Dual-logarithmic demodulation method application in a wide gas optical thickness range

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