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Optical temperature measurement technique utilizing phosphors

  • US 4,215,275 A
  • Filed: 02/15/1978
  • Issued: 07/29/1980
  • Est. Priority Date: 12/07/1977
  • Status: Expired due to Term
First Claim
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1. A method of determining the temperature of an object, comprising the steps of:

  • providing a length of optical fiber,positioning over one end of the optical fiber a sleeve having a heat conductive end, said heat conductive end having a layer of phosphor on an inside surface thereof, said phosphor being characterized by emitting, when excited, electromagnetic radiation within optically isolatable bandwidths at at last two distinct wavelength ranges and with relative intensities therein that vary as a known function of the phosphor temperature,placing said probe cover in contact with said object,exciting said phosphor to cause emission of said at least two wavelength bands,directing said phosphor emission through said optical fiber to a detecting station at another end of the optical fiber, anddetecting at the detecting station the relative intensities of said at least two distinct wavelength radiation bands, whereby said relative intensity is an indication of the temperature of the phosphor layer and related thereto by said known temperature emission function.

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