| 摘要 |
An optical system for exciting a temperature dependent phosphor with radiation and detecting independently emissions therefrom in optically isolable first and second wavelength ranges that gives an indication of the temperature of the phosphor. The optical system is carried by a heat-insulating housing disposed between a heat generating light source and the heat sensitive detectors. Dichroic mirrors are utilized to separate the two wavelength ranges emitted by the phosphor and to allow the sharing of a common optical path by three different radiation wavelength ranges without an undue loss of radiation intensity in any of the wavelength ranges. The light source may be of a helically shaped filament that is tilted with respect to an imaging optical axis so that the side of the helix is imaged with a minimum amount of the space between the turns showing, thereby maximizing the optical energy imaged from the light source. A temperature sensitive phosphor sensor is utilized with the instrument for internal calibration. The internal reference phosphor sensor also has its temperature measured by another standard technique for comparison. The internal calibration can also be used to calibrate a phosphor sensor on the end of a optical fiber by placing that end in a calibration bath maintained within the instrument.
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