Full-scale fiber grating piezoelectric tuning multi-gas sensing system and spectrum analysis method

Abstract

The invention discloses a full-scale fiber bragg grating piezoelectric tuning multi-gas sensing system and method. An optical fiber coupling lens group is connected with a branch formed by alternately connecting an optical fiber circulator and a fiber bragg grating in series; each fiber bragg grating is adhered to one piezoelectric ceramic piece, and all the piezoelectric ceramic pieces are electrically connected with the piezoelectric ceramic control circuit; the optical fiber circulator is connected with the multi-path optical switch, and the single-path output of the optical switch is connected with the optical fiber collimating lens group; the optical fiber collimating mirror group is arranged corresponding to the gas absorption tank, a right side cavity mirror of the gas absorption tank is connected with the stepping motor through a transmission shaft; the pre-amplification circuit is connected with a photoelectric detector and is connected with the transmission shaft through a connecting frame; the pre-amplification circuit is connected with the microcontroller through the A / D sampling circuit. According to the invention, a fiber bragg grating piezoelectric tuning method is adopted, a low-cost broadband continuous spectrum light source can be adopted, the wave band range is wide, and various gases can be detected at the same time.

Description

technical field [0001] The invention relates to the technical field of optical fiber multi-component gas sensing, in particular to a full-range optical fiber grating piezoelectric tuning multi-gas sensing system and a spectral analysis method. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] At present, there is a wide demand for simultaneous high-precision online monitoring and sensing of multi-component gases in industrial fields such as coal mining, petrochemical industry, and oil and gas storage and transportation. In the existing technology, tunable semiconductor laser absorption spectroscopy technology is the main technical means for high-precision online monitoring and sensing of gases. This technology uses a narrow-linewidth, tunable semiconductor laser as a light source, and performs wavelength scanning near the band of the gas mo...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual industrial application field, the target gas to be measured has many components, and the concentration of each component gas is significantly different.

For the simultaneous detection of multi-component gases, the existing technical methods have obvious defects: on the one hand, the wavelength scanning range of the tunable semiconductor laser light source is narrow, and cannot cover the absorption characteristic peaks of various gas components, so that each tunable semiconductor laser The laser light source can only obtain the characteristic absorption peak of a single gas component, and does not have the ability to detect multiple gases at the same time; Absorption line intensity and component concentration distribution vary

[0005] Although the existing technical means often add corresponding tunable semiconductor lasers and gas absorption cells for a variety of target gases to be measured, this not only increases the power consumption and volume of the device, but also increases its cost and cost, which greatly limits The number of gas components that the device can detect

[0006] In addition, in the actual industrial application field, the target gas to be measured has a large range of changes, and the traditional technical means are limited by the mutually restrictive factors of the circuit system magnification and signal-to-noise ratio, and the gas concentration detection range is limited, thus limiting its use. Applications in various industrial scenarios

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