A High Temperature Water Vapor Laser Spectrum Online Detection System

Abstract

The invention discloses an online high-temperature water vapor laser spectrum detection system which comprises a near-infrared DFB semiconductor laser with the central wavelength of 1397nm, wherein light beams emitted by the laser are divided into reference beams and detection beams by an optical fiber beam splitter; by the detection beams, two adjacent characteristic absorption spectral lines of water vapor nearby 1397nm position in the near-infrared spectrum area are simultaneously detected, so that the temperature of the water vapor is synchronously measured and real-time temperature parameters needed in temperature correction of the water vapor absorption spectrum are provided; with the adoption of a spectral digital alignment method based on double light paths, accurate alignment in the spectrum accumulation averaging process is realized, and the influence of drift of the output wavelength on the detection in continuous operation of the infrared semiconductor laser is avoided. Moreover, by utilizing background signal fitting and spectrum normalizing treatment, the influence of gas turbulence and environmental dust extinction on detection is eliminated, and online accurate measurement of high-temperature water vapor concentration is realized through strong real-time temperature correction of spectral lines.

Description

technical field [0001] The invention belongs to an online detection method and instrument for laser gas, in particular to an infrared semiconductor laser spectrum measurement method and instrument for high-temperature trace water vapor in industrial processes. Background technique [0002] Water vapor is a common gas associated with the combustion process in industrial processes. Water vapor concentration is also an important parameter for industrial process optimization, process control, and product quality assurance. Accurate measurement of high-temperature water vapor in industrial processes is of great significance in the industrial field and Wide range of application requirements. Traditional water vapor measurement methods mainly include three types: electrolysis method, resistance capacitance method, and chilled mirror method. Water vapor measurement instruments based on these methods are well used in conventional environments, but industrial processes have characteri...

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Problems solved by technology

However, infrared laser spectroscopy gas detection technology will also be affected by various environmental factors. Water vapor infrared semiconductor laser spectroscopy detection methods for complex industrial process environments need to be further improved in eliminating environmental interference.

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