Multi-component gas concentration measurement method based on photonic crystal groove waveguide

Abstract

The invention provides a multi-component gas concentration measurement method based on a photonic crystal groove waveguide, which is formed by a laser device 1, an air chamber 3, a detector 5, a lock phase amplifier 7, a signal generator 11, a current control system 13, and a computer system 9. The multi-component gas concentration measurement method is characterized in that the air chamber 3 is formed by the photonic crystal groove waveguide; a contact effect between light and gas to be detected is increased by using a slow light property and liquid with different refractive indexes is filled into air grooves in the two sides of the photonic crystal groove waveguide to obtain a slow light property which has high group refractive indexes, wide wideband and adjustable wavelength, and is not influenced by a preparation error of the radius of an air hole, so as to realize the high-sensitivity measurement on multi-component gas concentration, avoid a measurement error caused by noise interference, light source fluctuation, optical fiber transmission loss and the like by combining a harmonic detection signal processing method, and improve the measurement precision.

Description

technical field [0001] The invention relates to a multi-component gas concentration measurement method based on a photonic crystal groove waveguide, which belongs to the technical field of photoelectric detection. Background technique [0002] At present, many countries in the world regard environmental protection as a basic national policy, and establish corresponding organizations to detect and control environmental pollution. The detection and control of gas concentration and composition is an important frontier topic in the development of sensing technology today (Document 1. Wang Linlin, Beijing Air Pollution Characteristics Research [D], Shandong University, 2011). In practical applications, especially the rapid, real-time, high-sensitivity, and high-precision remote detection of low-concentration toxic gases is the goal pursued by many scientific researchers. Traditional gas detection technology is usually based on non-optical detection, which is easily affected by u...

AI Technical Summary

Problems solved by technology

However, in conventional photonic crystals, the light energy is generally localized in the medium with high dielectric constant, which greatly limits the interaction between light and the measured medium with low refractive index, and limits the photonic crystal to a large extent. Application in gas sensor

In addition, in ordinary photonic crystal slow-light devices, the group refractive index changes very rapidly with wavelength, which seriously affects the stability of the sensing system, and a photonic crystal slow-light device can only be used for a specific target gas detection

In addition, in the preparation process of photonic crystals, there is generally the problem of air hole radius preparation errors, which will seriously affect the slow light characteristics of photonic crystals (document 7. W. W. Song, R. A. Integlia, W. Jiang. Slow light loss due to roughness in photonic crystal waveguides: An analytic approach [J]. Physical Review B, 2010, 82(3): 235306.), which in turn affects the use of photonic crystals in gas sensing systems

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