Patent ID: 7364355

Claim:
An apparatus for measuring temperature of an object using an InGaAs detector, comprising: a camera having a lens for viewing a thermal image; an InGaAs detector array for receiving the thermal image from the lens; electronics for convening thermal image data from the detector array into a usable electrical signal; and a controller programmed to convert the electrical signal into a temperature measurement, wherein convening the electrical signal into a temperature measurement comprises: obtaining a detection threshold level of the InGaAs detector array indicative of an energy level at which the detector begins sensing incident energy; and generating the temperature measurement by applying the formula T target =Planck −1 (Planck( C 0− C 1( ADC− MinThreshold)+ C 2√( ADC −MinThreshold)+ C 3( ADC −MinThreshold) 3/2 /Emmissivity)); wherein C 0 , C 1 , C 2 and C 3 are calibration constants, Planck is the Plank function, ADC is an InGaAs detector array output, MinThreshold is a detection threshold level of the InGaAs detector array indicative of an energy level at which the detector begins sensing incident energy, and Emmissivity is the emmissivity of the measured object.