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US 7,364,355 B2Granted
Method and apparatus for obtaining a temperature measurement using an InGaAs detector
AssigneeIrcon, Inc.
InventorSteven Ignatowicz
Life of this patent
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Abstract
A method of linearizing the output a infrared camera having an InGaAs includes determining the an equivalent black body temperature of an object by utilizing a plurality of calibration constants determined by collecting data from a number of temperatures of the object, and determining a target temperature of the object by utilizing the equivalent black body temperature and the emissivity of the object.
Claims11
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
- Ttarget=Planck−1(Planck(C0−C1(ADC−MinThreshold)+C2√(ADC−MinThreshold)+C3(ADC−MinThreshold)3/2/Emmissivity));
- wherein C0, C1, C2 and C3 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.
11 more elements
A method of measuring temperature using an InGaAs detector, comprising:
- collecting data from a number of temperatures of an object;
- determining an equivalent black body temperature of the object by utilizing a plurality of calibration constants;
- and
- determining a temperature of the object in accordance with the formula:
- Ttarget=Planck−1(Planck(C0−C1(ADC−MinThreshold)+C2√(ADC−MinThreshold)+C3(ADC−MinThreshold)3/2/Emmissivity));
- wherein C0, C1, C2, and C3 are calibration constants,
- Planek 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;
- and
- communicating the temperature measurement to an output device, wherein the output device is adapted to communicate the temperature measurement to a user.
9 more elements
Dependencies are inferred from the claim text.