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Broadband cavity-enhanced spectrometer aids atmospheric glyoxal for on-line measurement
[China Instrument Network Instrument R&D] Recently, under the funding of the National Key R&D Program of the Ministry of Science and Technology, Prof. Zhang Weijun of the Anguang Institute has made new progress in the detection of atmospheric glyoxal (CHOCHO). The relevant research results are “Portable broadband cavity- “Enhanced spectrometer utilizing: Kalman filtering: application to real-time, in situ monitoring of glyoxal and nitrogen dioxide†was published in the Optics Express magazine hosted by the American Optical Society (OSA) (Opt. Express, 25, 26910-26922, 2017). (SCI II).
Assembly schematic of broadband cavity enhanced spectrometer
Atmospheric glyoxal is an important intermediate component in the degradation process of reactive organics. It is the key to the study of organic degradation mechanism and its influence on the generation of O3 and fine particles. The research group Fang Bo and Zhao Weixiong have developed a portable high-sensitivity wideband cavity-enhanced spectrometer that works in the 440-480 nm band to achieve on-line measurement of atmospheric CHOCHO. The instrument improves the traditional broadband cavity enhancement technology in two aspects of optical structure and back-end data processing: a standard cage structure design and SMA fiber connector collimators improve optical cavity coupling efficiency, compact structure, and good stability With an adaptive Kalman filter technique, the accuracy of CHOCHO measurement can reach 8 pptv at the 21s sampling time, which has reached the international advanced level.
Broadband spectral signals and fitting residuals for NO2(a) and CHOCHO(b) (c)
The instrument plays an important role in the field observation of the reactive organic matter atmosphere environment. At the same time, the established method has implications for the application of broadband cavity enhanced absorption spectroscopy in atmospheric trace detection.
(Original Title: New Advances in Atmospheric Glyoxal Field Measurement Technology)