Cleary Patricia A, Wooldridge Paul J, Cohen Ronald C
Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, USA.
Appl Opt. 2002 Nov 20;41(33):6950-6. doi: 10.1364/ao.41.006950.
Routine observations of atmospheric NO2 at concentrations ranging from 0.1 to 100 parts per billion are needed for air quality monitoring and for the evaluation of photochemical models. We have designed, constructed, and field tested a relatively inexpensive and specific NO2 sensor using laser-induced fluorescence. The instrument combines a commercial cw external-cavity tunable diode laser (640 nm) and a continuous supersonic expansion. The total package is completely automated, has a modest size of 0.5 m3 and 118 kg, and could be manufactured at competitive price, with the current generation of instruments. The sensitivity of the instrument is 145 part per trillion by volume min(-1) (signal-to-noise ratio of 2), which is more than adequate for monitoring purposes.
空气质量监测以及光化学模型评估需要对大气中浓度范围为0.1至100 ppb的二氧化氮进行常规观测。我们设计、制造并进行了现场测试，采用激光诱导荧光技术制作了一种相对廉价且特定的二氧化氮传感器。该仪器结合了商用连续波外腔可调谐二极管激光器（640 nm）和连续超声速膨胀技术。整套设备完全自动化，体积适中，为0.5立方米，重118千克，并且就当前一代仪器而言，能够以具有竞争力的价格制造。该仪器的灵敏度为145体积万亿分之一每分钟（信噪比为2），对于监测目的而言绰绰有余。
