Abstract: A pyrometer adapted to be disposed remotely from a heated diffusely reflecting target obtains a first electrical signal from that portion of target radiance which reaches the instrument. A laser beam is generated within the instrument and is directed upon the target, a portion of the beam being reflected back to the instrument. A second signal is obtain from this portion. The separation between target and instrument is measured and a third signal depending on the separation is produced. A fourth signal dependent upon the power level of the beam is produced. The instrument then computes from these signals the surface temperature of the target.

Abstract: A pyrometer adapted to be disposed remotely from a heated target employs a manually operated optical range finding device for measuring the distance between the target and the pyrometer. The device includes an objective lens mounted in a rotation-type focusing mechanism, split image effect prisms and a viewing screen. A split image appears on the screen when viewing until the mechanism is rotated to a unique angular position at which the image split disappears, the unique focusing position being a monotonic function of the distance. A mechanical gearing arrangement responsive to mechanism rotation is connected to a multi-turn potentiometer having oppositely disposed fixed contacts at each end and a movable contact. The movable contact is moved along the potentiometer in accordance with rotation of the mechanism. For each unique focusing position of the lens there is a corresponding unique position of the movable contact with respect to the end contacts.

Abstract: The invention teaches a method for measuring the temperature of remote hot samples in the presence of ambient radiation. A portion of the surface of the sample is treated to obtain a spectral emissivity different from the untreated surface. The spectral radiances of the treated and untreated surface portions are measured and the temperature calculated from these values and the known emissivities.

Abstract: A system is disclosed for monitoring the concentration of gaseous ammonia in flue gases by simultaneously measuring the temperature and optical transmission of a flue gas-ammonia mixture.

Abstract: The present invention is a system and method for remotely measuring the temperature of hot gases in fired furnaces. This is achieved by adjusting the physical temperature of a black body until it equals the radiation temperature of the black body as determined by a pyrometer viewing the black body through the hot gases.

Abstract: 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.

Abstract: 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.