Research Progress of Photolysis Rate Measurement Technology
As the initiating reaction of the chain reaction in the atmosphere,photolysis reaction is an important reason for the generation of secondary pollutants.As a key parameter to describe the photolysis reaction intensity,the accurate measurement of its value is more and more important.The measurement technology of photolysis rate has been developing continuously since it was researched.Up to now,the commonly used measurement technologies include chemical actinometry,filter radiom-etry,spectroradiometer.Chemical actinometry is the most direct method to measure the photolysis rate,because of its compli-cated operation flow and complex instruments,it is often used in laboratory.Filter radiometer is a simplified measurement technique with wide spectrum coverage,small volume and light weight,but it has the disadvantage of limited gas types and large measurement error.Spectroradiometer is the most general measurement method,which can simultaneously measure the photolysis rate of a variety of gases,and has been used to produce commercial photolysis spectrometers based on this princi-ple.However,spectral radiometers have high requirements for spectrometers.In addition,empirical formulas and pulsed(flash or laser)photolysis methods can be used to obtain photolysis rates for specific conditions.At the same time,the application of photolysis rate measurement technology in various aspects is further summarized,and the future research focus is prospected.
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