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Proceedings Paper

Low NEP pyroelectric radiometer standards
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Paper Abstract

Verification of the low measurement uncertainty of a group of eight newly developed pyroelectric detectors at the output of a traditional monochromator is described. The frequency compensated hybrid detector-amplifier packages have fixed 1010 Ω feedback resistors. The characterizations verified that the 3 dB upper roll-off frequencies of the signal-gain curves are close to 100 Hz and the temperature coefficient of responsivity is 0.14 %/oC. The hybrid packages were tested for noise performance in the f/8 beam of a grating monochromator between 900 nm and 2.7 μm. The monochromator output beam-power, the output signal, and the output noise of the hybrid packages were measured and compared. The NEPs were between 3.3 nW/Hz1/2 and 10 nW/Hz1/2. The relative standard uncertainty of the noise measurements was 20 % (k=1). The noise tests were utilized to select hybrid packages with NEPs that are one order of magnitude lower than that of traditional pyroelectric detectors and current-amplifiers. The power responsivity of one hybrid was calibrated against an absolute cryogenic radiometer. With this detector, the measured signal-to-noise ratios were higher than 400 between 1.1 μm and 2.1 μm and 250 at 2.5 μm using a lock-in integrating time-constant of 1 s. The noise test results show that using a hybrid detector with an NEP equal to the group average of about 6 nW/Hz1/2, spectral responsivity measurements with a relative standard uncertainty of 0.2 % to 0.4 % (k=1) can be achieved.

Paper Details

Date Published: 1 May 2008
PDF: 8 pages
Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 694036 (1 May 2008); doi: 10.1117/12.776940
Show Author Affiliations
G. P. Eppeldauer, National Institute of Standards and Technology (United States)
J. Zeng, National Institute of Standards and Technology (United States)
H. W. Yoon, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 6940:
Infrared Technology and Applications XXXIV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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