Low NEP pyroelectric radiometer standards

Eppeldauer, George P.; Zeng, Jinan; Yoon, Howard W.

doi:10.1117/12.776940

Cited by 8 publications

(9 citation statements)

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“…A silicon trap detector was used for most of the visible part of the spectrum. Alternately, a 50 mm diameter integrating sphere was used with either silicon or InGaAs for the UV, visible, and IR out to 1.5 μm, a pyroelectric detector was used throughout the spectrum and at the longest wavelengths (Eppeldauer, Zeng, and Yoon, 2008). All of these detectors were calibrated against the cryogenic radiometer prior to the measurement campaign.…”

Section: Post-launch Characterization Of Sim Engineering Model Componmentioning

confidence: 99%

The SORCE SIM Solar Spectrum: Comparison with Recent Observations

et al. 2010

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The Spectral Irradiance Monitor (SIM) on board the NASA SORCE satellite (Solar Radiation and Climate Experiment) was launched on 25 January 2003 and has been making twice-daily measurements of solar variability in the 220 to 1630 nm range and daily measurements in the 1600 to 2400 nm range. This study presents preflight and postlaunch calibration activities of the SIM instrument and its flight spare components as well as inflight comparisons with the ATLAS 3 composite spectrum (Atmospheric Laboratory for Applications and Science) in the ultraviolet (UV), visible, and near infrared (NIR) as well as comparisons with the SOLSTICE (Solar Stellar Irradiance Comparison Experiment) in the UV. In the 258 to 1350 nm range, the SIM agrees with ATLAS 3 with a fractional difference of −0.021 ± 0.021 (k = 1, estimated standard deviation) and with the additional corrections discussed herein the agreement improves to −0.008 ± 0.021 (k = 1). In the ultraviolet (220-307 nm) the agreement between all the instruments in this study is better than 5%, but fractional differences reveal other instrument-and calibration-related differences. In the 1350 to 2400 nm range the agreement between SIM and ATLAS 3 is about 8%, so these SIM data are corrected to agree with ATLAS 3 in this range.

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Section: Post-launch Characterization Of Sim Engineering Model Componmentioning

confidence: 99%

The SORCE SIM Solar Spectrum: Comparison with Recent Observations

et al. 2010

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“…The response deviation from constant, within the spectral range where the measured sources emit radiation, depends on the allowed uncertainty of the broadband measurement. Recently developed low-NEP pyroelectric detectors [5] are excellent candidates to measure not only UV but also other kinds of LEDs in the spectral range where the pyroelectric detector has close to constant spectral response. Based on this type of reference pyroelectric meter, the broadband scale-transfer procedure can be simplified, source standards will not be needed, and selection of the field test meters may not be needed.…”

Section: The Uv Broadband Measurement Proceduresmentioning

confidence: 99%

Broadband radiometric LED measurements

Eppeldauer

Cooksey

Yoon

et al. 2016

Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems

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At present, broadband radiometric measurements of LEDs with uniform and low-uncertainty results are not available. Currently, either complicated and expensive spectral radiometric measurements or broadband photometric LED measurements are used. The broadband photometric measurements are based on the CIE standardized V(λ) function, which cannot be used in the UV range and leads to large errors when blue or red LEDs are measured in its wings, where the realization is always poor. Reference irradiance meters with spectrally constant response and high-intensity LED irradiance sources were developed here to implement the previously suggested broadband radiometric LED measurement procedure [1, 2]. Using a detector with spectrally constant response, the broadband radiometric quantities of any LEDs or LED groups can be simply measured with low uncertainty without using any source standard. The spectral flatness of filtered-Si detectors and low-noise pyroelectric radiometers are compared. Examples are given for integrated irradiance measurement of UV and blue LED sources using the here introduced reference (standard) pyroelectric irradiance meters. For validation, the broadband measured integrated irradiance of several LED-365 sources were compared with the spectrally determined integrated irradiance derived from an FEL spectral irradiance lamp-standard. Integrated responsivity transfer from the reference irradiance meter to transfer standard and field UV irradiance meters is discussed.

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“…For spectral responsivity scale extension to the infrared and monochromator use, eight low-NEP pyroelectric hybrid detectors have been characterized and selected. They were built from 100 µm thick LiTaO 3 crystals and utilized a frequency compensation method [3]. The 5 mm diameter active area of the detectors was coated with organic black paint.…”

Section: Transfer-standard Pyroelectric Radiometermentioning

confidence: 99%

“…The 5 mm diameter active area of the detectors was coated with organic black paint. The paint introduced a differentiating time constant that cancelled the large integrating time constant of the photocurrent-to-voltage converter (attached to the pyroelectric detector) [3]. The paint also introduced an integrating timeconstant which is much smaller than the original (cancelled) integrating time constant.…”

Section: Transfer-standard Pyroelectric Radiometermentioning

confidence: 99%

Extension of the NIST spectral responsivity scale to the infrared using improved-NEP pyroelectric detectors

et al. 2009

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Routine NIST spectral responsivity calibrations are needed for the infrared range. Low-NEP pyroelectric radiometers have been developed for traditional monochromator applications to extend the responsivity scale to the infrared. After NEP tests, the best pyroelectric detectors were converted to transfer-standard radiometers. The relative spectral responsivities were determined from spectral reflectance measurements of the organic black detector coatings. The absolute tie points were measured against a domed pyroelectric radiometer standard and a sphere-input extended-InGaAs transfer-standard radiometer. The infrared spectral power responsivity scale has been extended for the 2 µm to 14 µm wavelength range. A single-grating monochromator has been adapted to the calibration facility and used to characterize and calibrate infrared detectors.

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Low NEP pyroelectric radiometer standards

Cited by 8 publications

References 0 publications

The SORCE SIM Solar Spectrum: Comparison with Recent Observations

The SORCE SIM Solar Spectrum: Comparison with Recent Observations

Broadband radiometric LED measurements

Extension of the NIST spectral responsivity scale to the infrared using improved-NEP pyroelectric detectors

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