Patent ID: 6682216
Filing Date: 2004-01-27
Classification: G01J

Abstract:
An apparatus for non-contact real-time true temperature and emissivity measurement of a target, comprising:a single fiber optic comprising a first end and a second end, wherein light from said target is collected at said first end, propagates through said fiber optic and emerges from said second end as transmitted light; a light chopper comprising periodic reflective and transmissive portions, wherein said light chopper is positioned to receive said transmitted light, wherein said transmitted light is periodically reflected into a first beam by said light chopper, wherein said transmitted light is periodically transmitted into a second beam by said light chopper, wherein said light chopper produces a reference signal indicating the duty cycle of said light chopper; a first photoconductor optically positioned to receive and electrically configured to detect said first beam to produce a first detected signal; a first lock-in amplifier electrically configured to receive said reference signal and said first detected signal, wherein said first lock-in amplifier produces a first amplified analog output signal having an amplitude that is proportional to said first detected signal; a second photoconductor optically positioned to receive and electrically configured to detect said second beam to produce a second detected signal; a second lock-in amplifier electrically configured to receive said reference signal and said second detected signal, wherein said second lock-in amplifier produces a second amplified analog output signal having an amplitude that is proportional to said second detected signal; and a computer system implementing an algorithm for calculating true temperature and emissivity from said first amplified analog output signal and said second amplified analog output signal.