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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 21 — Jul. 20, 2008
  • pp: 3731–3736

Absolute linearity measurements on a gold-black-coated deuterated L-alanine-doped triglycine sulfate pyroelectric detector

E. Theocharous  »View Author Affiliations

Applied Optics, Vol. 47, Issue 21, pp. 3731-3736 (2008)

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The nonlinearity characteristics of a commercially available deuterated L-alanine-doped triglycine sulfate (DLATGS) pyroelectric detector were experimentally investigated at high levels of illumination using the National Physical Laboratory detector linearity characterization facility. The detector was shown to exhibit a superlinear response at high levels of illumination. Moreover, the linearity factor was shown to depend on the area of the spot on the detector active area being illuminated, i.e., the incident irradiance. Possible reasons for the observed behavior are proposed and discussed. The temperature coefficient of the response of the DLATGS pyroelectric detector was measured and found to be higher than + 2.5 % ° C 1 . This large and positive temperature coefficient of response is the most likely cause of the superlinear behavior of the DLATGS pyroelectric detector.

© 2008 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(040.5160) Detectors : Photodetectors
(120.5630) Instrumentation, measurement, and metrology : Radiometry

ToC Category:

Original Manuscript: February 25, 2008
Revised Manuscript: April 30, 2008
Manuscript Accepted: June 12, 2008
Published: July 11, 2008

E. Theocharous, "Absolute linearity measurements on a gold-black-coated deuterated L-alanine-doped triglycine sulfate pyroelectric detector," Appl. Opt. 47, 3731-3736 (2008)

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  1. E. Theocharous, J. Ishii, and N. P. Fox, “Absolute linearity measurements on HgCdTe detectors in the infrared,” Appl. Opt. 43, 4182-4188 (2004). [CrossRef] [PubMed]
  2. E. Theocharous, “Absolute linearity measurements on PbS detectors in the infrared,” Appl. Opt. 45, 2381-2386 (2006). [CrossRef] [PubMed]
  3. E. Theocharous, “Absolute linearity measurements on a PbSe detector in the infrared,” Infrared Phys. Technol. 50, 63-69(2007). [CrossRef]
  4. E. Theocharous and J. R. Birch, “Detectors for mid- and far-infrared spectrometry: selection and use,” in Handbook of Vibrational Spectroscopy, J. M. Chalmers and P. R. Griffiths, eds. (Wiley, 2002), pp 349-367.
  5. R. L. Richardson, H. Yang, and P. R. Griffiths, “Evaluation of a correction for photometric errors in FT-IR spectrometry introduced by the nonlinear detector response,” Appl. Spectrosc. 52, 565-571 (1998). [CrossRef]
  6. R. L. Richardson, H. Yang, and P. R. Griffiths, “Effects of detector nonlinearity on spectra measured on three commercial FT-IR spectrometers,” Appl. Spectrosc. 52, 572-578 (1998). [CrossRef]
  7. The photodetector is actually illuminated by approximately 50% of the output source because of the attenuation introduced by the beam splitter.
  8. K. D. Mielenz and K. L. Eckerle, “Spectrophotometer linearity testing using the double aperture method,” Appl. Opt. 11, 2294-2303 (1972). [CrossRef] [PubMed]
  9. E. Theocharous, “Reply to comments on 'Absolute linearity measurements on a PbS detector in the infrared',” Appl. Opt. 46, 6495-6497 (2007). [CrossRef] [PubMed]
  10. The identification of certain commercial equipment in this paper does not imply recommendation or endorsement by the NPL nor does it imply that the equipment identified is the best available for the purpose.
  11. J. Lehman, E. Theocharous, G. Eppeldauer, and C. Pannel, “Gold-black coatings for freestanding pyroelectric detectors,” Meas. Sci. Technol. 14, 916-922 (2003). [CrossRef]
  12. E. Theocharous, “Absolute linearity characterization of lock-in amplifiers,” Appl. Opt. 47, 1090-1096 (2008). [CrossRef] [PubMed]
  13. E. Theocharous, F. J. J. Clarke, L. J. Rogers, and N. P. Fox, “Latest measurement techniques at NPL for the characterization of infrared detectors and materials,” Proc. SPIE 5209, 228-239 (2003). [CrossRef]
  14. When the linearity factor of a photodetection system is higher than unity, then the photodetection system is said to exhibit a superlinear response behavior.
  15. The DC equivalent irradiance is the irradiance incident on the detector active area when the mechanical chopper is removed from the optical beam.
  16. E. Theocharous, “The establishment of the NPL infrared relative spectral responsivity scale using cavity pyroelectric detectors,” Metrologia 43, S115-S119 (2006). [CrossRef]
  17. The temperature coefficient of response of a thin-film photoconductive PbS detector was measured for radiation of 1.6 and 2.2 μm wavelength to be −4.04% °C−1 and −3.86% °C−1, respectively, for a detector temperature of 0 °C (see ).
  18. E. Theocharous and O. J. Theocharous, “Practical limit of the accuracy of radiometric measurements using HgCdTe detectors,” Appl. Opt. 45, 7753-7759 (2006). [CrossRef] [PubMed]
  19. B. Burton, Selex Sensors and Airborne Systems Infra Red Ltd., Southampton, UK (personal communication, 2007).

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