Exxon Research and Engineering Company

Paul Rabinowitz

Alexander Stein

Andrew Kaldor

Bruce N Perry

The present invention teaches a unique laser radiometer capable of accurately measuring the radiation temperature of a radiant surface and independently measuring the surface's emissivity. A narrow-band radiometer is combined with a laser reflectometer to measure concurrently radiance and emissivity of a remote, hot surface. Together, radiance and emissivity yield the true surface temperature of the remote target. A narrow receiver bandwidth is attained by one of two methods; (a) heterodyne detection or (b) optical filtering. A direct measurement of emissivity is used to adjust the value obtained for the thermal radiation signal to substantially enhance the accuracy of the temperature measurement for a given subject surface. The technique provides substantially high detection sensitivity over a very narrow spectral bandwidth.

Laser radiometer

A device is disclosed for producing a pair of synchronized intense 16 micron pulses in which stimulated rotational Raman scattering together with four wave mixing and pulse compression takes place in parahydrogen on an off-axis path between a pair of spherical mirrors.

Technique for synchronization of raman scattered radiation

This application discloses a method of separating the isotopes of an element which form a volatile compound having an isotopically shifted but overlapping infrared absorption spectrum. In the method, IR radiation of first and second laser frequencies are employed. The first infrared laser frequency produces a selective excitation of the desired isotope of the compound, while the second infrared laser frequency produces a higher multiphoton excitation which allows conversion of the excited compound.

Isotope separation process

A device is disclosed for producing intense 16 micron radiation in which stimulated rotational Raman scattering takes place in parahydrogen on an off-axis path between a pair of spherical mirrors.

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Old Bethpage, NY, United States of America

Paul Rabinowitz