State-of-the-art transfer radiometer for testing and calibration of FLIR test equipment (original) (raw)
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State-of-the-art transfer radiometer for testing and calibration of FLIR test equipment
1991
A spectroradiometer was modified to test the stability, uniformity, and accuracy of radiance differentials of state-of-the-art FLIR test systems. It is shown that the radiometric tests make it possible to obtain important information which cannot be obtained with conventional contact temperature probes. The output radiance of the FLIR test equipment was measured as a function of time and angle with respect to the collimator optical axis.
Infrared calibration development at Fluke Corporation Hart Scientific Division
2008
A flat plate calibrator is one instrument used in calibrating infrared (IR) thermometers, primarily in the 8 µm to 14 µm band. One such family of flat plate calibrators is the 418X Precision IR Calibrator from Fluke Corporation Hart Scientific Division. This product is calibrated with a radiometric calibration. To support this radiometric calibration and its traceability, a number of developments have been made at Hart Scientific. These developments include the construction of a new IR calibration laboratory with radiometric traceability. This presentation discusses the research done to establish IR calibration capabilities. Among the topics discussed are the need for radiometric traceability for flat plate calibrators, the traceability chain to national laboratories included in radiometric calibrations at Hart Scientific, the development of blackbody cavity baths in Hart's IR calibration laboratory, and Hart Scientific's IR uncertainty budgets.
Optical Engineering, 1999
A four-band (8.2 to 9.2, 10.5 to 11.5, 11.5 to 12.5, and 8 to 14 m), prototype, thermal-IR radiometer, model CE 312 [CE 312 is the company model number. In previous papers, the CE 312 was called the CLIMAT (conveyable low-noise IR radiometer for measurements of atmosphere and ground-surface targets)], with a built-in radiance reference is been fabricated by CIMEL Electronique (Paris, France) for use as a field instrument. The instrument is briefly described, laboratory characterization is detailed, and its field measurements are compared with those from three other radiometers. The CE 312's main characteristics are linearity of better than 0.8%, field of view of 9.5 deg; noise-equivalent temperature difference of 0.06 to 0.2 K (depending on the band) for brightness temperatures of 0 to 75°C; SNR greater than 1100 for the broadband and greater than 400 for the other bands for brightness temperatures between 10 and 80°C; and repeatability of the measured radiance smaller than 0.35% after four field campaigns, corresponding to 0.2 K in terms of brightness temperature. Field measurements were conducted over different periods during 1996 at Jornada Experimental Range, New Mexico, Lunar Lake and Railroad Valley, Nevada, and Lake Tahoe, California. The CE 312 compares quite favorably with the other instruments: the brightness temperature at two different sites compared to within 0.3 K with two instruments. These measurements show that the CE 312 thermal-IR radiometer is very stable for ambient temperatures varying between 15 and 60°C and that the availability of several filters in the thermal-IR region can help tremendously to improve the accuracy of the radiance determination. © 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(99)01902-9]
PHyTIR - A Prototype Thermal Infrared Radiometer
2013
This paper describes the PHyTIR (Prototype HyspIRI Thermal Infrared Radiometer) instrument, which is the engineering model for the proposed HyspIRI (Hyperspectral Infrared Imager) earth observing instrument. The HyspIRI mission would be comprised of the HyspIRI TIR (Thermal Infrared Imager), and a VSWIR (Visible ShortWave Infra-Red Imaging Spectrometer). Both instruments would be used to address key science questions related to the earth’s carbon cycle, ecosystems, climate, and solid earth properties. Data gathering of volcanic activities, earthquakes, wildfires, water use and availability, urbanization, and land surface compositions and changes, would aid the predictions and evaluations of such events and the impact they create. Even though the proposed technology for the HyspIRI imager is mature, the PHyTIR prototype is needed to advance the technology levels for several of the instrument’s key components, and to reduce risks, in particular to validate 1) the higher sensitivity, s...
Visible/infrared radiometric calibration station
SPIE Proceedings, 1994
an affirmativeaction/equalopportunity empkJyor,is operated by the Universityof Cal,ornla _orme u._. L.epanlllem o_ L-'_qly" I undercontractW-7405-ENG-36. By acceptanceof thisarticle,the publisherrecognizesthatthe U.S. Governmentretainsa nonexclusiue, royalty-free licenseto publish or reproducethe publishedformof thiscontribution, or to allowotherstodo so, for U.S. Governmentpurposes.The LosAlamos National Laboratory requeststhat the publisheridentifythisarticleas workperformedunderthe auspicesofthe U.S. Departmentof Energy. Form No. 836R5 ST 262910/91
Operational Measurements for Infrared Camera Characterization
Journal of Aerospace Technology and Management, 2017
The detection, location, identification and recognition are very important activities for the air forces. Imaging systems are tools used for those functions, so it is mandatory to characterize those systems to really know their actual operational limits. This paper presents a set of measurements for spectral, radiometric and spatial camera characterization to be applied to imaging systems operating in the thermal infrared. A SC5600 camera manufactured by FLIR® Systems was used and assembled with lenses of 27 or 54 mm equivalent focal length. The camera spectral characterization was done by comparison to a calibrated system composed by thermal source, monochromator and a broadband reference detector. The radiometric characterization was performed using an extensive blackbody (CI Systems) for temperatures between 10 and 55 °C to evaluate the camera accuracy and obtain the calibration curves. The spatial characterization was carried out using the same extensive blackbody and 2 standard USAF 1951 machined targets, one made of steel and other of aluminum, serving as masks for the blackbody. Using recycled material, a homemade extended blackbody for outdoor use was built. The results obtained using the 2 blackbodies in laboratory were similar.
Radiometric performance evaluation of ASTER VNIR, SWIR, and TIR
IEEE Transactions on Geoscience and Remote Sensing, 2005
Radiometric performance of the Advanced Spectrometer for Thermal Emission and Reflection Radiometer (ASTER) is characterized by using acquired imagery data. Noise-equivalent reflectance and temperature, sensitivity (gain), bias (offset), and modulation transfer function (MTF) are determined for the visible and near-infrared (VNIR), the shortwave infrared (SWIR), and the thermal infrared (TIR) radiometers that constitute ASTER. The responsivity evaluated from onboard calibration
Journal of Atmospheric and Oceanic Technology, 2003
The performances of the new conveyable low-noise infrared radiometer for measurements of atmosphere and ground surface targets, or CLIMAT, are presented for in situ measurements. For this, quantitative analyses were carried out on measurements performed with a prototype during various field experiments. The accuracy of the radiometric measurements controlled by using a field blackbody is estimated for severe environmental conditions. Two modes of operation and two types of targets are described. Ground-based measurements of the sky radiance are compared to radiative transfer calculations that use atmospheric profiles from radiosoundings as input parameters. Sea surface temperatures estimated from airborne CLIMAT measurements are compared to satellite retrievals. These experiments constitute a first set of quantitative tests of the CLIMAT radiometer for groundbased and airborne remote sensing applications. They demonstrate that CLIMAT can be considered for future studies on clouds and aerosols, sea water, and surface such as ice, vegetation, bare soil, and rocks.
Compensation of the readout data for FLIR Photon 320 infrared camera
2011
This paper present a compensation model for the readout data obtained from the infrared camera, that shows a drift when the incoming infrared is constant in time. This problem degrades the quality of the measurements in thermographics applications, rising to mistake results and obtaining wrong conclusions. This is a key step when theorical heat transfer model are adjusted to measurements data. The proposed compensation scheme improves the readout data reducing the error when no compensation is presented.