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Using a high finesse optical resonator to provide a long light path for differential optical absorption spectroscopy: CE-DOAS

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Academic year: 2017

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Fig. 1. Schematic diagram of the LED/SLD-based experimental setup used for CE-DOAS. L 1 and L 2 : lenses; M 1 and M 2 : high reflectivity dielectric mirrors with R≈0.99998 at 655 nm; Filter:
Fig. 2. Ring-down signal averaged from 1000 cycles. Small dots: measurement data. Solid line: multi-exponential fit (0–225 µs)
Fig. 3. Transmitted intensity of the resonator: Integration time 10×5 s. The dotted line shows the transmitted intensity of the empty cavity, which is the LED emission spectrum folded by the mirror transmission
Fig. 4. Detection of NO 3 in a large background of O 3 in air. The solid line shows the absorption coe ffi cient of the samples calculated by conventional CEAS means from the data shown in Fig
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