Patent ID: 6237421
Filing Date: 2001-05-29
Classification: G01D,G01L,G01M

Abstract:
A measurement apparatus for measuring at least one of strain and temperature, of an object, said apparatus comprising:an optical fiber secured to an object, said optical fiber having first and second ends;pulsed pump light source means for injecting pulsed pump light into the first end of said optical fiber;pulsed probe light source means for injecting pulsed probe light into the second end of said optical fiber;control means operatively connected to said pulsed pump light source means and said pulsed probe light source means for setting the pulsed probe light to a frequency .nu.s and for scanning the pulsed probe light over a range of frequencies;light intensity measurement means for measuring intensity of output light emitted from the first end of said optical fiber;filter means located in an optical path from the first end of said optical fiber to said light intensity measurement means, for selectively transmitting scattered light included in the output light; andcomputation means operatively connected to said light intensity measurement means for computing at least one of strain and temperature of a zone of the object within a measurement area of said optical fiber from the scattered light reaching by said light intensity measurement means.