Rocket-borne cryogenically cooled field-widened interferometer for the 2 to 8 microns spectral region

Details Rocket-borne cryogenically cooled field-widened interferometer for the 2 to 8 microns spectral region Rocket-borne cryogenically cooled field-widened interferometer for the 2 to 8 microns spectral region

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979spie..191..120h&link_type=abstract

In: Multiplex and/or high-throughput spectroscopy; Proceedings of the Seminar, San Diego, Calif., August 27, 28, 1979. (A80-4282

Physics

Cooling Systems, Cryogenic Equipment, Infrared Interferometers, Michelson Interferometers, Near Infrared Radiation, Rocket-Borne Instruments, Thermophysical Properties, Electronic Control, Gas Bearings, Liquid Helium, Liquid Nitrogen, Spectral Resolution

Scientific paper

A liquid nitrogen cooled rocketborne near infrared interferometer spectrometer has been developed using compensating wedge prisms to achieve a wide field-of-view and using a gas-lubricated bearing slide for the movable mirror carriage to maintain stable precision alignment and scanning speeds of 1 second/scan. A nickel manganese iron alloy has been developed which has very nearly the same thermal physical properties of calcium fluoride, thus rigid mounting of the calcium fluoride is possible which reduces the possibility of fracture on cool down and assures optical alignment after the instrument is subjected to the severe vibration of the rocket flight. An entendue of 0.67 sq cm sr has been achieved and the bearing smoothness stiffness and control are sufficient to yield a resolution of at least 2/cm. A liquid helium cooled bismuth doped silicon detector is used providing a NESR of 1.5 x 10 to the -12th watt per cm sr at 5 microns when operating at a scan time of 1.3 seconds.

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