Making the most of the throughput advantage in imaging Fourier transform spectrometers

Details Making the most of the throughput advantage in imaging Fourier transform spectrometers Making the most of the throughput advantage in imaging Fourier transform spectrometers

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..419g&link_type=abstract

The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 419-422 (1

Other

Infrared Spectrometers, Auxiliary Equipment, And Techniques, Interferometers

Scientific paper

Some aspects of imaging Fourier transform spectrometers are still not generally understood. One particular point leading to confusion concerns the throughput of time-scanning imaging instruments and how it can be compared to the étendue of conventional Fourier transform infrared radiometers (FTIRs). This paper shows that a scanning imaging Fourier transform spectrometer can, in general, use more throughput than a similar non imaging instrument. It is important to understand that the overall instrument's throughputs must be compared. The pixel throughput of the imaging instrument is not greater than the throughput of the non-imaging device. But many pixels side by side lead to a greater étendue. Examples of calculated throughput for various realistic configurations are shown to illustrate the throughput gain of imaging FTIRs. Another confusing aspect is the étendue of imaging spatially modulated interferometers (SMIs). The étendue of such devices is highly dependent on their particular design. It is shown that SMIs tilting collimated beams suffer from a throughput reduction with tilt angle. Experimental results confirm the theoretical expression derived for fringe visibility with respect to tilt angle. Configurations of imaging FTIRs with no moving parts that achieve higher étendue are presented and discussed.

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