18 May 2012 Widely tunable Fabry-Perot filter based MWIR and LWIR microspectrometers
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Proceedings Volume 8374, Next-Generation Spectroscopic Technologies V; 83740X (2012); doi: 10.1117/12.919169
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States
Abstract
As is generally known, miniature infrared spectrometers have great potential, e. g. for process and environmental analytics or in medical applications. Many efforts are being made to shrink conventional spectrometers, such as FTIR or grating based devices. A more rigorous approach for miniaturization is the use of MEMS technologies. Based on an established design for the MWIR new MEMS Fabry-Perot filters and sensors with expanded spectral ranges in the LWIR have been developed. The range 5.5 - 8 μm is particularly suited for the analysis of liquids. A dual-band sensor, which can be simultaneously tuned from 4 - 5 μm and 8 - 11 μm for the measurement of anesthetics and carbon dioxide has also been developed. A new material system is used to reduce internal stress in the reflector layer stack. Good results in terms of finesse (≤ 60) and transmittance (≤ 80 %) could be demonstrated. The hybrid integration of the filter in a pyroelectric detector results in very compact, robust and cost effective microspectrometers. FP filters with two moveable reflectors instead of only one reduce significantly the acceleration sensitivity and actuation voltage.
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Martin Ebermann, Norbert Neumann, Karla Hiller, Elvira Gittler, Marco Meinig, Steffen Kurth, "Widely tunable Fabry-Perot filter based MWIR and LWIR microspectrometers", Proc. SPIE 8374, Next-Generation Spectroscopic Technologies V, 83740X (18 May 2012); doi: 10.1117/12.919169; https://doi.org/10.1117/12.919169
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KEYWORDS
Reflectors

Optical filters

Mid-IR

Transmittance

Long wavelength infrared

Spectrometers

Infrared radiation

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