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Displaying 101 - 125 of 147

Photocurrent Measurement of PC and PV HgCdTe Detectors

June 1, 2001
Author(s)
George P. Eppeldauer, R J. Martin
Novel preamplifiers for working standard PC and PV HgCdTe detectors have been developed to maintain the spectral responsivity scale of the National Institute of Standards and Technology (NIST) in the wavelength range of 5 m to 20 m. The linear PC mode

Opto-Mechanical and Electronic Design of a Tunnel-Trap Si-Radiometer

November 1, 2000
Author(s)
George P. Eppeldauer, D C. Lynch
A transmission-type light-trap silicon-radiometer has been developed for the Spectral irradiance and Radiance Response Calibrations with Uniform Sources (SIRCUS) Facility of NIST to hold the spectral power and irradiance responsivity scales between 406 nm

Infrared Spectral Responsivity Scale of NIST

May 1, 2000
Author(s)
George P. Eppeldauer, Alan L. Migdall
An ambient temperature Infrared Spectral Responsivity Comparator Facility has been developed at NIST to calibrate infrared detectorsand radiometers for spectral and spatial responsivities. Test detectors are substituted for working- or transfer-standard

Noise-Optimized Silicon Radiometers

March 1, 2000
Author(s)
George P. Eppeldauer
Transimpedance-gain, loop-gain, and voltage-gain requirements of photodide short-circuit-current meters are summarized for ac and dc optical radiation measurements. Design considerations to implement the gain equations in silicon radiometers are discussed

Domain-Engineered Pyroelectric Radiometer

December 1, 1999
Author(s)
John H. Lehman, George P. Eppeldauer, J A. Aust, M. Racz
We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer standard for measurements in the near- and the mid-infrared wavelength regions.

Improved Accuracy Tristimulus Colorimeters Calibrated With Standard

August 6, 1999
Author(s)
George P. Eppeldauer
A new method has been developed to calibrate tristimulus colorimeters for high accuracy color measurements. Instead of traditional lamp standards, modern, high accuracy detector standards are suggested for calibration. After high accuracy absolute spectral

Spectral Response Based Calibration Method of Tristimulus Colorimeters

December 1, 1998
Author(s)
George P. Eppeldauer
The accuracy of tristimulus colorimeters can be increased by using detector standards instead of traditional lamp standards for calibration. After high accuracy absolute spectral response determination of the color channels, spectral and amplitude

Spectroradiometric Detector Measurements: Part III--Infrared Detectors

December 1, 1998
Author(s)
Alan L. Migdall, George P. Eppeldauer
The National Institute of Standards and Technology (NIST) supplies calibrations of IR photodetector's spectral radiant power response from 1.8 υm to 20 υm. The spectral responsivity of a detector under test is determined by comparison to an absolute

InSb Working Standard Radiometers

October 1, 1998
Author(s)
George P. Eppeldauer, Alan L. Migdall, Leonard M. Hanssen
Standard quality InSb radiometers have been developed and characterized at the national Institute of Standards and Technology (NIST). The InSb radiometers will hold the recently realized spectral response scale of the NIST and will serve as working