Real-time signal-processing concepts for trace-gas analysis by diode-laser spectroscopy
Anno: 1994
Autori: Werle Peter W., Scheumann Bodo, Schandl Josef
Affiliazione autori: Fraunhofer Inst. IFU, Garmisch-Partenkirchen, Germany
Abstract: Tunable-diode-laser absorption spectroscopy fulfills the major requirements for trace-gas analysis: sensitivity, specifity, high detection speed, and the possibility of simultaneous in situ measurements. The well-known limitations for low-concentration measurements become more and more dominant at sub-part-per-billion levels, where sensitive spectrometers are often influenced by noise, drift effects, and changes in the spectral background structure. While many improvements in instrument development focus on optimizing electronics and optical components, much less effort has been put into postdetection signal processing and adaptive control. Therefore, a transputer-based platform has been developed which allows control of most relevant parameters of a diode-laser spectrometer. Fluctuations in the signal amplitude as well as drift and jitter effects in the frequency domain can cause a significant degradation of system performance and therefore determine the ultimate detection limit. A signal-processing concept with novel aspects for tunable-diode-laser spectroscopy will be presented and discussed.
Giornale/Rivista: OPTICAL ENGINEERING
Volume: 33 (9) Da Pagina: 3093 A: 3105
Parole chiavi: Absorption spectroscopy; Control systems; Optimization; Real time systems; Semiconductor diodes; Semiconductor lasers; Trace analysis; Transputers, Jitter effects; Trace gas analysis, Signal processingDOI: 10.1117/12.178262Citazioni: 63dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui