Tunable laser spectrum secondary harmonic intelligent analyzing method and implementing equipment

Abstract

The invention relates to tunable semiconductor laser spectrum secondary harmonic linearisation multiple components intelligent analyzing method and apparatus for realizing the same. which is based on the PC bus line visual equipment technology, wherein the intelligent heuristic search, pattern recognition and matching, self-establishing fundamental wave and modulating wave are introduced into the software and hardware, thus achieving the purpose of good mobility, high precision and stability .

Description

technical field [0001] Laser spectroscopy. Background technique [0002] It is a worldwide trend that the population is concentrating in cities. Our country with a large population has also accelerated the process of urbanization. The green environment of urban construction has become an important symbol. However, according to statistics, 80% of urban air pollution comes from motor vehicle exhaust. Pollutants have the characteristics of high toxicity, low content, multi-component, and persistence. However, it is still difficult to perform real-time dynamic multi-component telemetry at present, and it remains in the state of simulated dynamic measurement. The use of laser spectroscopy to analyze pollutants not only concentrates light energy, but also has strong selectivity for spectral absorption through different components, so it is an effective technical approach. [0003] Laser spectral analysis includes differential absorption spectroscopic analysis based on the optical...

AI Technical Summary

Problems solved by technology

There are three problems in this method: First, due to the complexity of the field environment, in order to obtain true and reliable monitoring results, it is often necessary to change the modulation signal of the laser (including the frequency and amplitude of the sawtooth wave and the modulation frequency and modulation of the sine wave). Depth), which requires manual modification of the output of the instrument, and this modification generally requires professionals to complete; second, for slightly complex modulation waveforms, general instruments cannot generate them, and must be specially ordered; third, because the modulation signal is generated by It is produced by special instruments, so that the volume of the whole exhaust gas monitoring system cannot be made very small, which is not suitable for field installation and debugging

[0006] 1. The direct absorption line has a slanted background

[0007] 2. To carry out sample calibration, there may be sampling errors

[0009] 4. It is unfavorable for the selection and identification of broadband absorbing molecules

[0010] 5. It is difficult to distinguish the small spectral peak between the two major signals

Images