Patent ID: 6524001
Filing Date: 2003-02-25
Classification: G01K

Abstract:
A system for measuring optical fiber temperature comprising:a laser having an output and producing at least a first electromagnetic spectrum at the output; a first optical filter having a first side; the first side coupled to the output of the laser, reflective of the first electromagnetic spectrum, oriented to reflect the first electromagnetic spectrum in a first direction, transmissive of a second electromagnetic spectrum having a lesser average wavelength than the first electromagnetic spectrum and received from the first direction, and transmissive of a third electromagnetic spectrum having a greater average wavelength than the first electromagnetic spectrum and received from the first direction; a second optical filter having a second side; the second side aligned in the path of electromagnetic radiation received from the first direction and transmitted through the first optical filter, reflective of the second electromagnetic spectrum, oriented to reflect the second electromagnetic spectrum in a second direction, and transmissive of the third electromagnetic spectrum; a first detector, coupled to electromagnetic radiation reflected in the second direction and sensitive to at least the second electromagnetic spectrum; a second detector, coupled to electromagnetic radiation transmitted through the second optical filter and sensitive to at least the third electromagnetic spectrum; and a third optical filter having a third side, the third side aligned in the path of the electromagnetic radiation reflected in the second direction, transmissive of the second electromagnetic spectrum, and nontransmissive of the first and third electromagnetic spectra.