研究目的
To describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) for aircraft measurements of glyoxal (CHOCHO), methylglyoxal (CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O), and to demonstrate its performance during field campaigns.
研究成果
The ACES instrument provides robust, highly sensitive, and fast time-response measurements under aircraft sampling conditions. It has been successfully deployed in field campaigns, demonstrating its capability for accurate and precise measurements of target gases.
研究不足
The accuracy of measurements is limited mainly by the available absorption cross sections. The precision for HONO is lower than for CHOCHO and NO2, making it less suitable for low-concentration environments.
1：Experimental Design and Method Selection:
The instrument uses two LEDs and a single grating spectrometer with a CCD detector for measurements across 361–389 nm and 438–468 nm. It employs a custom optical mounting system and high-reflectivity cavity mirrors.
2：Sample Selection and Data Sources:
The instrument was deployed during two aircraft and two ground-based field campaigns.
3：List of Experimental Equipment and Materials:
Includes high-power LEDs, a CCD detector, high-reflectivity cavity mirrors, and materials minimizing analyte surface losses.
4：Experimental Procedures and Operational Workflow:
The instrument's robust performance is achieved through electronic on/off modulation of LEDs and a custom optical mounting system.
5：Data Analysis Methods:
Data analysis involves retrieving concentrations of target gases from the measured spectra.
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