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

Zhu, Cunguang; Chang, Jun; Wang, P.P.; Wang, Q.; Wei, Wei; Liu, Z.; Zhang, S.S.

doi:10.1016/j.optcom.2014.05.040

Cited by 3 publications

(4 citation statements)

References 17 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%

“…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%

“…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]. 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.…”

Section: Discussionmentioning

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%

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

et al. 2015

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“…Direct absorption spectroscopy is the simplest and most direct detection technique in TDLAS [ 12 , 13 ]. It often employs the self-balanced technology for demodulating absorption signals, which has been described in detail in previous research [ 14 ]. A distributed feedback laser diode (DFB-LD) emission scanning across a gas absorption wavelength is split into two beams by a 1 × 2 fiber coupler.…”

Section: Introductionmentioning

confidence: 99%

A Robust Distributed Multipoint Fiber Optic Gas Sensor System Based on AGC Amplifier Structure

Zhu

Wang

Tao

et al. 2016

Sensors

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A harsh environment-oriented distributed multipoint fiber optic gas sensor system realized by automatic gain control (AGC) technology is proposed. To improve the photoelectric signal reliability, the electronic variable gain can be modified in real time by an AGC closed-loop feedback structure to compensate for optical transmission loss which is caused by the fiber bend loss or other reasons. The deviation of the system based on AGC structure is below 4.02% when photoelectric signal decays due to fiber bending loss for bending radius of 5 mm, which is 20 times lower than the ordinary differential system. In addition, the AGC circuit with the same electric parameters can keep the baseline intensity of signals in different channels of the distributed multipoint sensor system at the same level. This avoids repetitive calibrations and streamlines the installation process.

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