Analysis and design of an improved light interference methane sensor

Lin, Hao; Liang, Zize; Li, En; Yang, Mingbo; Zhai, Bo

doi:10.1109/icca.2014.6870954

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Methane is colorless and tasteless, concentrations of more than 5% are prone to explosion, and its stable properties make it difficult to detect at room temperature. Methane sensors in China mainly include the infrared absorption type [ 1 , 2 , 3 ], catalytic combustion type [ 4 , 5 ], gas–sensitive semiconductor type [ 6 , 7 ], light interference type [ 8 , 9 ] and surface acoustic wave type [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Study on SAW Methane Sensor Based on Cryptophane-A Composite Film

et al. 2023

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Surface Acoustic Wave (SAW) methane-sensing technology is a new way to detect methane at room temperature. However, the material and structure of the sensitive film are the important factors affecting the detection performance of the sensor. In this paper—with a SAW methane sensor using graphene–nickel cavitation—a composite film is proposed, which can work at room temperature. A delay linear dual-channel differential oscillator with center frequency of 204.3 MHz and insertion loss of −5.658 dB was designed; Cryptophane-A material was prepared by the “three-step method”. The composite sensitive film was synthesized by a drop coating method, electrochemical deposition method and electroplating method. The composite film was characterized by SEM. The sensor performance test system and gas sensitivity test system were constructed to determine the response performance of the sensor at concentrations of 0~5% CH4. The results showed that the sensor had a good response recovery performance in the test concentration range, and the frequency offset was positively correlated with methane concentration. The 90% average response time and recovery times were 41.2 s and 57 s, respectively. The sensor sensitivity was 809.4 ± 6.93 Hz/(1% CH4). This study provides a good theoretical basis for the development of surface acoustic-wave methane sensors.

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Section: Introductionmentioning

confidence: 99%

Study on SAW Methane Sensor Based on Cryptophane-A Composite Film

et al. 2023

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“…Therefore, a fast, accurate, and precise monitoring of trace greenhouse gas of CH 4 is essential. There are some methods for detecting methane, including chemical processes [3][4][5][6] and optical spectroscopy [7][8][9]. Optical spectroscopy for detecting gases is based on the Beer-Lambert law [10][11][12], in which the light attenuation is related to the effective length of the sample in an absorbing medium, and to the concentration of absorbing species, respectively.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Modulation Spectroscopy for Methane Detection Based on Tunable Diode Laser

et al. 2019

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In this review, methane absorption characteristics mainly in the near-infrared region and typical types of currently available semiconductor lasers are described. Wavelength modulation spectroscopy (WMS), frequency modulation spectroscopy (FMS), and two-tone frequency modulation spectroscopy (TTFMS), as major techniques in modulation spectroscopy, are presented in combination with the application of methane detection.

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“…In 2014, Lin improved the traditional optical path structure of the light interference methane sensor by reducing the size of the sensor [15,16]. The planar optical path model is used to analyze the principle of light interference methane sensor.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of an Effective Light Interference Methane Sensor Based on Three-Dimensional Optical Path Model

Long

Yang

et al. 2018

Journal of Sensors

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As an important environmental monitoring equipment, the existing methane sensors or the traditional interferometer-based methane detectors have some drawbacks, such as low accuracy, large size, and complex calibration operations. Moreover, the optical path model and analysis method for the light interference methane sensor are not practical. In this paper, an effective light interference methane sensor is proposed based on a three-dimensional optical path model with point light source. Based on this model, the interference optical system is studied to illustrate the cause of the interference fringes. Furthermore, the influencing factors of the light intensity distribution are analyzed and an adjustment method for the interference fringes is proposed, which helps to simplify the assembling and calibrating operations. In order to improve the measurement accuracy, a temperature drift compensation method which includes a mapping table, a steady-state compensator, and a dynamic compensator is proposed. The mapping table is established between the output voltages of photoelectric detector, and the methane concentration, the steady-state compensator, and the dynamic compensator are proposed to eliminate the temperature drift. Finally, an experimental device for the light interference methane sensor is constructed to validate the interference fringe adjustment method and the temperature drift compensation method.

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Analysis and design of an improved light interference methane sensor

Cited by 3 publications

References 9 publications

Study on SAW Methane Sensor Based on Cryptophane-A Composite Film

Study on SAW Methane Sensor Based on Cryptophane-A Composite Film

Recent Developments in Modulation Spectroscopy for Methane Detection Based on Tunable Diode Laser

Analysis and Design of an Effective Light Interference Methane Sensor Based on Three-Dimensional Optical Path Model

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