Water vapor detection system based on scanning spectra

Zhang, Shicong; Wang, Qiang; Zhang, Yan; Song, Fujun; Chen, Kun; Chou, Guoqing; Chang, Jun; Wang, Pengpeng; Kong, Delong; Wang, Zongliang; Wang, Weijie; Liu, Yongning; Song, Haiyong

doi:10.1007/s13320-011-0038-z

Cited by 17 publications

(13 citation statements)

References 11 publications

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“…According to the Lambert-Beer law, when a beam of parallel light with an intensity I 0 (λ) passes through a gas cell filled with the gas under test and provided that the spectrum of the light source encompasses one or more of the absorption lines of the gas, the relationship among the transmitted light intensity I(λ), incident intensity I 0 (λ), and the gas concentration C is [7,8] …”

Section: Test Principlementioning

confidence: 99%

A coal mine multi-point fiber ethylene gas concentration sensor

et al. 2015

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Spontaneous combustion of the coal mine goaf is one of the main disasters in the coal mine. The detection technology based on symbolic gas is the main means to realize the spontaneous combustion prediction of the coal mine goaf, and ethylene gas is an important symbol gas of spontaneous combustion in the coal accelerated oxidation stage. In order to overcome the problem of current coal ethylene detection, the paper presents a mine optical fiber multi-point ethylene concentration sensor based on the tunable diode laser absorption spectroscopy. Based on the experiments and analysis of the near-infrared spectrum of ethylene, the system employed the 1.62 μm (DFB) wavelength fiber coupled distributed feedback laser as the light source. By using the wavelength scanning technique and developing a stable fiber coupled Herriot type long path gas absorption cell, a ppm-level high sensitivity detecting system for the concentration of ethylene gas was realized, which could meet the needs of coal mine fire prevention goaf prediction.

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Section: Test Principlementioning

confidence: 99%

A coal mine multi-point fiber ethylene gas concentration sensor

et al. 2015

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“…When the laser frequency is resonant with the frequency of a transition for the absorbing species in the gas, the laser energy will be absorbed. The attenuation of the laser intensity along the path length of L can be described by the Beer-Lambert law [8]:…”

Section: Principle Of Analog Signal Sourcementioning

confidence: 99%

Realization of rapid debugging for detection circuit of optical fiber gas sensor: Using an analog signal source

et al. 2015

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An optical fiber gas sensor mainly consists of two parts: optical part and detection circuit. In the debugging for the detection circuit, the optical part usually serves as a signal source. However, in the debugging condition, the optical part can be easily influenced by many factors, such as the fluctuation of ambient temperature or driving current resulting in instability of the wavelength and intensity for the laser; for dual-beam sensor, the different bends and stresses of the optical fiber will lead to the fluctuation of the intensity and phase; the intensity noise from the collimator, coupler, and other optical devices in the system will also result in the impurity of the optical part based signal source. In order to dramatically improve the debugging efficiency of the detection circuit and shorten the period of research and development, this paper describes an analog signal source, consisting of a single chip microcomputer (SCM), an amplifier circuit, and a voltage-to-current conversion circuit. It can be used to realize the rapid debugging detection circuit of the optical fiber gas sensor instead of optical part based signal source. This analog signal source performs well with many other advantages, such as the simple operation, small size, and light weight.

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“…As the manufacturing process of DFB-LD fairly matures, tunable diode laser spectroscopy (TDLS) has been extensively applied to monitor the concentrations of various gases [1]- [4]. Compared to electrochemical and other non-optical techniques, TDLS not only has numerous advantages such as excellent insulation property, high sensitivity, wide range, long operating life, and real-time performance, but also provides a ability for applications to simultaneously measure multiple parameters including pressure, concentration and temperature by accuracy fitting the absorption line shape [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Continuously Wavelength-Tunable Light Source With Constant-Power Output for Elimination of Residual Amplitude Modulation

et al. 2015

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A continuously wavelength-tunable light source with constant-power output is presented. The unwanted optical power modulation companying with the wavelength modulation of the distributed feedback laser diode by the injection current is successfully offset by the external amplitude modulation of electro-optic modulator. The optical power stability has been experimentally demonstrated better than 1.2% in a wavelengthtunable range of 0.876 cm −1 . The background baseline appearing in the direct absorption spectrum can be removed with the new light source. Not only that, the spectral distortion of the second harmonic signal caused by residual-amplitude modulation can also be largely eliminated. Experimental results have shown that the new light source is more suitable to be served as a pure wavelength-tuning reference source for different modes of spectroscopic measurement.

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Water vapor detection system based on scanning spectra

Cited by 17 publications

References 11 publications

A coal mine multi-point fiber ethylene gas concentration sensor

A coal mine multi-point fiber ethylene gas concentration sensor

Realization of rapid debugging for detection circuit of optical fiber gas sensor: Using an analog signal source

Continuously Wavelength-Tunable Light Source With Constant-Power Output for Elimination of Residual Amplitude Modulation

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