Full-field rainbow measurement method and device based on dual-wavelength self-calibration scattering angle

Abstract

The invention relates to the field of gas-liquid two-phase flow measurement, and aims to provide a full-field rainbow measurement method and device based on dual-wavelength scattering angle self-calibration. The measuring device consists of four parts: a spray generating unit, a laser emitting unit, a signal collecting unit and a signal processing unit; the laser emitting unit consists of two semiconductor lasers with different wavelengths, a modulating element, a beam splitter mounted on a rotary displacement stage, and a reflective The mirror stand system is composed; the signal collection unit refers to: a Fourier imaging system composed of a field of view lens, a small aperture diaphragm and an imaging lens, and a color CCD chip. The invention realizes the systematic self-calibration of the scattering angle in the whole-field rainbow measurement; it has the characteristics of fast self-calibration, simple structure, easy operation, no need for additional high-precision measuring instruments, and is suitable for expanding to one-dimensional rainbow measurement and industrial online application; it can quickly , Accurately and effectively determine the intrinsic relationship between the scattering angle and the CCD pixels in the full-field rainbow measurement system.

Description

technical field [0001] The invention relates to the field of gas-liquid two-phase flow measurement, in particular to a full-field rainbow measurement device and method that uses dual wavelengths to directly measure the distribution of multiple parameters such as particle size, refractive index, and temperature of spray droplets without any special calibration process . Background technique [0002] Liquid atomization is a widespread phenomenon in energy, chemical and other industrial fields. Accurately measuring and controlling various parameters of spray droplets in complex spray flow fields plays an important guiding role in organizing the spray combustion process reasonably, improving combustion efficiency and reducing pollutant emissions. Traditional contact measurement methods, such as immersion method, tracking method, sedimentation method, freezing method, wax melting method and instantaneous sampling method, etc., are difficult to adapt due to the destruction of the...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that additional manual calibration is still required in the existing spray droplet laser rainbow measurement technology, and to provide a full-field rainbow measurement method and device based on dual-wavelength scattering angle self-calibration

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