NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 17.01-2678

PROJECT TITLE : Apparatus for spectral and total emissivity measurements on liquid materials

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

Accurate radiometric temperature measurements require accurate knowledge of normal spectral emissivity,e, over the bandpass of the radiometer/pyrometer. The total hemispherical emissivity,e-tot, which is the ratio of the total energy emitted by a real body into the surroundings to that emitted by a blackbody at the same temperature determines the radiant energy loss to the surroundings. The most accurate values of e and e-tot are obtained by direct computation from the optical constants of the materials over wide wavelength range. We propose a novel, wide-wavelength spectroscopic ellipsometer (SE) for direct measurements of both the total hemispherical emissivity, and the spectral emissivity over the 0.4-6.0 um wavelength range, for liquid materials as a function of temperature. The Phase I research plan includes: (i) identifying methods to obtain infrared laser light, (ii) addressing instrumentation issues such as infrared polarization optics and detectors, and (iii) conducting preliminary measurements on materials of interest. There is an immediate need for such data within NASA's microgravity program in support of the TEMPUS MSL-1 flight experiment in which spectral emissivity data over the pyrometer bandpass are needed. The Phase II project will result in a new SE which will be used to measure the optical properties of materials to be investigated on TEMPUS.
POTENTIAL COMMERCIAL APPLICATIONS
Successful completion of the Phase I and II research programs will lead to the development of a new apparatus and new techniques for spectral and radiative property measurements. There is an immediate need for wideband spectral emissivity data in support of the TEMPUS MSL-1 flight experiment. A long term need for such data exist in industrial applications such as furnace design, casting design models and in microgravity materials science research.
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Dr. Shankar Krishnan,
Containerless Research, Inc.,
906 University Place,
Evanston, IL, 60201
NAME AND ADDRESS OF OFFEROR
Containerless Research, Inc.,
906 University Place,
Evanston, IL, 60201