Laser light ray deflection correction device and method based on modulation sawtooth wave signal
A correction device, sawtooth wave technology, applied in measuring devices, thermometer testing/calibration, thermometers with physical/chemical changes, etc., can solve the problem of not eliminating light intensity jitter, not ideal, beam cross-sectional laser light intensity distribution Inhomogeneity and other problems, to achieve the effect of simple optical path design and signal processing process, and improve sensitivity
Active Publication Date: 2018-01-09
BEIHANG UNIV
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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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[0020] exist figure 1 Among them, the visible light laser source 101 and the infrared tunable laser source 102 are controlled to emit calibration light and probe light in the form of a sawtooth wave scanning signal with the same amplitude and phase and modulated by a high-frequency sine wave. The calibration light and the detection light are coupled through the fiber coupler 201 and enter the measured temperature area through the collimator 301. The receiving end uses the dichroic beam splitter 401 to separate the calibration light and the detection light and respectively enter the visible light detector 501 and the infrared detector 501. Detection is performed on the photodetector 601 .
[0021] Step 1: Control the visible light laser source and the infrared tunable laser source so that they send laser signals in the form of a sawtooth wave scanning signal with the same amplitude and phase and modulated by a high-frequency sine wave. Among them, the visible light band emitted...
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The invention designs a laser light ray deflection correction device and method based on a modulation sawtooth wave signal. The device comprises a visible light laser light source, an infrared tunablelaser light source, an optical fiber coupler, a collimator, a dichroic beam splitter and a photoelectric detector and the like. The method comprises the following steps: to begin with, controlling the visible light laser light source and the infrared tunable laser light source to emit calibration light and detection light in the form of same-amplitude and same-phase wawtooth wave scanning signalsobtained after high-frequency sine wave modulation, wherein the two paths of light have light-intensity fluctuation due to influence of the ray deflection effect after passing through a measured temperature area, the light-intensity fluctuation being reflected in the amplitude variation of sine waves; extracting amplitude variation of sine wave signals of the calibration light to obtain light-intensity fluctuation caused by the ray deflection effect; and carrying out correction on the light intensity signal of the detection light by utilizing the amplitude variation of the sine waves of the calibration light, and only keeping corresponding laser absorption information, thereby realizing correction of the ray deflection effect. The method has an important use value and broad application prospect in application of a laser absorption spectrum wavelength modulation method.
Description
(1) Technical field [0001] 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. (2) Background technology [0002] 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 present, the main com...
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IPC IPC(8): G01K11/32G01K15/00
Inventor 徐立军曹章李芳燕
Owner BEIHANG UNIV