Software-switching between direct absorption and wavelength modulation spectroscopy for the investigation of ADC resolution requirements |
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Authors: | B Lins R Engelbrecht and B Schmauss |
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Institution: | (1) Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universit?t Erlangen-N?rnberg, Paul-Gordan-Str. 6, 91052 Erlangen, Germany;(2) Lehrstuhl f?r Hochfrequenztechnik (LHFT), Universit?t Erlangen-N?rnberg, Cauerstr. 9, 91058 Erlangen, Germany |
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Abstract: | We present a tunable diode laser spectrometer that can be software-switched between a wavelength modulation spectroscopy (WMS)
operation mode and the direct absorption spectroscopy (DAS) technique on a per-scan basis. The new setup allows a direct comparison
between the two techniques under equal hardware and system environment conditions. In this work, we compare the impact of
analog-to-digital converter resolution for operation in WMS and DAS mode. Example concentration evaluations show that in the
DAS approach, relative absorptions smaller than the least significant bit can be measured with scan averaging and FIR-filtering
applied. With full resolution, both techniques show similar performance in our setup, with a slight advantage for the WMS
implementation. |
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Keywords: | |
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