Laser light deflection correction device and method based on modulated sawtooth wave signal

Abstract

The present invention designs a laser light deflection correction device based on a modulated sawtooth wave signal. The components used include: visible light laser light source, infrared tunable laser light source, fiber coupler, collimator, dichroic beam splitter, photoelectric detector wait. The method includes the following steps: firstly, the visible light laser source and the infrared tunable laser source are controlled to make them emit calibration light and detection light with a sawtooth wave scanning signal modulated by a high-frequency sine wave with the same amplitude and phase. After the two paths of light pass through the measured temperature area, they will be affected by the light deflection effect and fluctuate in light intensity, which will be reflected in the amplitude change of the sine wave. By extracting the amplitude variation of the calibration optical sine wave signal, the light intensity fluctuation caused by the light deflection effect can be obtained. The light intensity signal of the probe light is corrected by using the sine wave amplitude change of the calibration light, and only the information corresponding to the laser absorption is retained, so as to realize the correction of the light deflection effect. It has important use value and broad application prospect in the application of laser absorption spectrum wavelength modulation method.

Description

[0001] (1) Technical field [0002] The present invention relates to a laser beam deflection correction device and method based on a modulated sawtooth wave signal, in particular to output calibration light and detection light signals with a sawtooth wave scanning signal of the same intensity modulated by a high-frequency sine wave, and utilize the calibration light sinusoidal The amplitude change of the wave modulation signal corrects the detection light intensity signal, thereby realizing the correction of the light deflection effect encountered in the laser absorption spectrum wavelength modulation temperature measurement method. [0003] (2) Background technology [0004] The distribution of temperature field is one of the main parameters reflecting the combustion status. On-line monitoring of combustion temperature changes helps to understand and improve the combustion status of the burner, thereby improving combustion efficiency and reducing pollutant emissions. At presen...

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Problems solved by technology

However, the distribution of laser light intensity in the cross-section of the beam obtained by this method is still uneven, and the light intensity jitter will not be eliminated.

To sum up, the existing methods to solve the problem of light deflection are not ideal. In order to effectively measure the internal parameters of the flame and meet the effective monitoring of the combustion process, it is urgent to develop a method that can fundamentally solve the problem of light deflection. new method

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