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Method and apparatus for accurately and instantaneously determining the thermodynamic temperature of remote objects by continuous determination of the emissivity, the reflectivity, and optical constants, as well as the apparent or brightness temperature of the sample with a single instrument. The em

Method and apparatus for accurately and instantaneously determining the thermodynamic temperature of remote objects by continuous determination of the emissivity, the reflectivity, and optical constants, as well as the apparent or brightness temperature of the sample with a single instrument. The emissivity measurement is preferably made by a complex polarimeter including a laser that generates polarized light, which is reflected from the sample into a detector system. The detector system includes a beamsplitter, polarization analyzers, and four detectors to measure independently the four Stokes vectors of the reflected radiation. The same detectors, or a separate detector in the same instrument, is used to measure brightness temperature. Thus, the instrument is capable of measuring both the change in polarization upon reflection as well as the degree of depolarization and hence diffuseness. This enables correction for surface roughness of the sample and background radiation, which could otherwise introduce errors in temperature measurement.

대표청구항 ▼

Apparatus for measurement of the thermodynamic temperature of a radiating object comprising a light source means of given wavelength for reflecting a beam of light off the object at a given angle, means for interrupting said beam of light, detector means for receiving radiation from said object comp

Apparatus for measurement of the thermodynamic temperature of a radiating object comprising a light source means of given wavelength for reflecting a beam of light off the object at a given angle, means for interrupting said beam of light, detector means for receiving radiation from said object comprising both the self-emitted radiation from the object when the light is off in order to determine the brightness temperature of the object and combined reflected and transmitted radiation from the object when the light source means is on, in order to determine the emissivity of the object. said detector means comprising means for amplitude splitting of the received radiation into two component beams, means for dividing each of the two component beams into two beams each of polar components, and means for measuring the intensities of the four resulting components, said intensities being related to the four Strokes vectors of the received radiation, and computing means for computing the brightness temperature and emissivity of the object and for combining said brightness temperature and said emissivity to determine the thermodynamic temperature of the object. Method for non-contact determination of the thermodynamic temperature of a remote object, said method comprising the steps of directing a polarized light beam to the object causing said light to be reflected and transmitted from said object, measuring four polarization components of the light reflected and transmitted from the object to determine emissivity, interrupting said polarized light beam and simultaneously measuring the brightness temperature of the object from radiation self-emitted from the object, and combining the two measurements to determine the thermodynamic temperature.