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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 32 — Nov. 10, 2007
  • pp: 7872–7883

Design and performance of a throughput-matched, zero-geometric-loss, modified three objective multipass matrix system for FTIR spectrometry

David R. Glowacki, Andrew Goddard, and Paul W. Seakins  »View Author Affiliations


Applied Optics, Vol. 46, Issue 32, pp. 7872-7883 (2007)
http://dx.doi.org/10.1364/AO.46.007872


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Abstract

The design of and initial results obtained from a multipass matrix system (MMS) for mid-infrared spectroscopy that operates in the Highly Instrumented Reactor for Atmospheric Chemistry (HIRAC) recently constructed in the School of Chemistry at the University of Leeds, is described. HIRAC is an evacuable, temperature variable, photochemical atmospheric reaction chamber. The MMS design is a modified Chernin cell, utilizing three objective mirrors and two field mirrors. In addition to providing the paraxial equations required for design of a throughput matched multipass cell and throughput matched transfer optics, advanced ray tracing simulations have been performed for the Chernin design described herein. The simulations indicate that, for this MMS, which features small off-axis angles and preserves perfectly the focal properties of the original White design, the paraxial equations are nearly exact, throughput losses due to astigmatism are insignificant, and the system has zero theoretical geometric loss. Measurements of the signal incident on the detector at different matrix arrangements confirm the ray trace results, suggesting that geometric loss in this system is insignificant. The MMS described herein provides adequate stability to permit measurements while the chamber mixing fans are on, gives very good detection limits for some representative species, and is easy to align.

© 2007 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(010.1280) Atmospheric and oceanic optics : Atmospheric composition

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: March 29, 2007
Revised Manuscript: September 27, 2007
Manuscript Accepted: September 27, 2007
Published: November 8, 2007

Citation
David R. Glowacki, Andrew Goddard, and Paul W. Seakins, "Design and performance of a throughput-matched, zero-geometric-loss, modified three objective multipass matrix system for FTIR spectrometry," Appl. Opt. 46, 7872-7883 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-32-7872

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