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Alkanes gas detection system and method based on step-scan integral absorption method

A gas detection system, alkane technology, applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of improving measurement sensitivity, improving dynamic range, and good flexibility

Active Publication Date: 2019-09-24
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology

However, for macromolecules with relatively complex molecular structures, such as propane, n-butane, isobutane and other gases, they often have the characteristics of broad-spectrum absorption, and the previous peak-finding method is no longer applicable

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  • Alkanes gas detection system and method based on step-scan integral absorption method
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  • Alkanes gas detection system and method based on step-scan integral absorption method

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0037] The invention discloses an alkane gas detection system based on a step-scan integral absorption method. For alkane gas, such as propane, n-butane and isobutane gas, due to its relatively complex molecular structure, it has a wide spectrum Strong absorption peak, the previous peak-finding method is no longer applicable, so the present invention tunes the wavelength of the laser output by selecting a wide-spectrum adjustable mid / near-infrared semiconductor laser, so that the wavelength tuning range can cover the entire wide-spectrum absorption peak of propane ; and during the tuning process, let the output wavelength of the laser scan step by step from low to high, and calculate the corresponding absorbance at each sc...

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Abstract

The invention provides a detection system and method for alkane gas based on a step-and-scan integrated absorption process. The detection system comprises a control unit used for controlling transmission and detection of a tunable laser and an infrared detector in a stepping manner and for processing detection signals, the tunable laser used for transmitting detection laser and the infrared detector used for detecting the intensity of laser having passed through reference gas or to-be-detected alkane gas. The detection system and method provided by the invention utilize medium / near infrared wave bands for detection of alkane gas, thereby preventing influence of steam, carbon dioxide and the like in the air; the detection system and method can realize detection if complex molecules with wide-spectrum absorption characteristics by using the characteristics of the wide-spectrum tunable laser and the step-and-scan integrated absorption process; and the detection system and method have the advantages of high sensitivity and a wide dynamic range.

Description

technical field [0001] The invention relates to the fields of gas sensing and volatile organic compound (VOC) detection based on laser spectroscopy, in particular to an alkane gas detection system and method based on a step-scan integral absorption method. Background technique [0002] Volatile organic compounds (VOC), as a major source of atmospheric pollution, have attracted more and more attention. Among the volatiles of refined oil, alkane gas is the main volatile component, with a variety of complex components, especially propane, butane Alkanes and other gases are the main components, so it is very necessary to detect a single gas in it, and its detection method is required to be able to respond dynamically in real time and with high sensitivity. In the previous VOC gas detection technology, gas chromatography-mass spectrometry requires pre-sampling of gas samples and cannot be detected in real time; as a chemical method, the catalytic fuel method has insufficient dyna...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/39
Inventor 赖思良龚萍王辉高慧谢亮
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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