Broadband optical filters in spectroscopy

Robert J. Nordstrom

doi:10.1117/12.341024

26 February 1999 Broadband optical filters in spectroscopy

Robert J. Nordstrom

Proceedings Volume 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring; (1999) https://doi.org/10.1117/12.341024
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

Many applications for spectroscopy in on-line chemical monitoring do not require high resolution. For these cases, optical filters can be useful and cost-effective. To cover a spectral region using filters, the traditional method has been to select a set of non-overlapping filters. With this set, the instruments can monitor the optical power in each small spectral element. The disadvantage to this approach is the poor peak transmittance characteristics of narrow band filters. This paper discusses the use of overlapping broadband filters to accomplish the task of spectral measurement over the same total spectral region. Greater optical throughput and signal-to-noise ratio can be achieved.

Citation Download Citation

Robert J. Nordstrom "Broadband optical filters in spectroscopy", Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); https://doi.org/10.1117/12.341024

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