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- W2388635625 abstract "A compact instrument based on the off-axis integrated-cavity output spectroscopy(ICOS)technology was developed for sensitive measurements of gas mixing ratios(ammonia in air)at room temperature by using fiber-coupled distributed feedback(DFB)diode laser operating at 1.531 μm.The absorption line of ammonia at 6 528.764 cm-1 was chosen for trace detection.The mirrors' effective reflectivity R2 of 0.996 9 was first calibrated by carbon dioxide under this condition,and the cavity 35.8 cm in length as an absorption cell could yield an optical path of presumably 115.46 m.As a result,a minimum detectable concentration of approximately 2.66 ppmv(S/N～3)at the total pressure of 100 torr was obtained.Then the lock-in amplifier was added in the system to acquire the second harmonic signal by combination of wavelength modulation technology,which could better suppress background noise and improve the signal-to-noise ratio,and a detection limit of 0.293 ppmv(S/N～3)was achieved eventually.This work demonstrated the potential of the system for a range of atmospheric species sensing in the future." @default.
- W2388635625 created "2016-06-24" @default.
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- W2388635625 date "2009-01-01" @default.
- W2388635625 modified "2023-09-23" @default.
- W2388635625 title "Trace Detection of Ammonia at 1.531 μm" @default.
- W2388635625 hasPublicationYear "2009" @default.
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