High-frequency NO-PLIF imaging measurement device and method

Abstract

;The invention relates to a high-frequency NO-PLIF imaging measurement device and method for a combustion field, and the device comprises a high-frequency laser which is used for generating 1064nm laser with the repetition frequency of 100kHz and outputting 355nm laser after triple frequency multiplication of the 1064nm laser, wherein the 355nm laser is divided into a first 355nm laser beam and asecond 355nm laser beam through a first lens a seed laser module which is used for generating 822.3 nm seed laser; an optical parametric oscillator which is used for converting the first beam of 355 nm laser input by the high-frequency laser and the 822.3 nm laser input by the seed laser module to generate 624.7 nm laser; an NO-PLIF module which is used for synthesizing 624.7 nm laser input by theoptical parametric oscillator and a second beam of 355 nm laser input by the high-frequency laser into 226 nm light, wherein the 226 nm light is gathered in a standard gas pool through a convex lensto react with NO to generate a PLIF optical signal; and an imaging measurement module which is used for imaging the PLIF optical signal and then processing the PLIF optical signal in the computer to obtain the flame temperature of the combustion field to be measured.

Description

technical field [0001] The invention belongs to the field of combustion diagnosis, and in particular relates to a high-frequency NO-PLIF imaging measurement device and method. Background technique [0002] Combustion is a rapid and violent process of luminescence and heat generated by the interaction of flow, heat transfer, mass transfer and chemical reaction. It is a complex physical and chemical phenomenon, usually accompanied by sudden changes in the properties of the system in space or time, especially are chemical composition and temperature. The combustion process is the main way of energy generation in the world. At present, more than 80% of the world's energy and power come from the combustion of fuels. It can be said that combustion is crucial to the operation of society. Although after several centuries of development, combustion has a fairly mature technology, but the emission of pollutants related to combustion has caused troubles to the wider use of combustion....

AI Technical Summary

Problems solved by technology

[0008] The existing NO planar laser-induced fluorescence (NO-PLIF) technology mostly uses low-frequency repetitive lasers. Compared with high-frequency NO-PLIF, it aims at the time resolution and spatial resolution of the combustion pollutant NO quantitative measurement of unstable combustion organization. The rate is not high

At the same time, the existing technology multi-purpose dye laser is loaded into C450 dye solution to generate fundamental frequency light with a wavelength of about 450nm, which is frequency-multiplied to 225nm by the frequency conversion unit for NO fluorescence induction, but the dye laser has low laser efficiency, poor photostability, and damage threshold. Low, not suitable for ultra-high repetition rate systems and other issues

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