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Applied Optics

Applied Optics


  • Vol. 20, Iss. 15 — Aug. 1, 1981
  • pp: 2676–2682

Compliance of Si photodiodes with Talbot's law

J. Priu and W. Budde  »View Author Affiliations

Applied Optics, Vol. 20, Issue 15, pp. 2676-2682 (1981)

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For accurate measurements of chopped radiation, it is important that the photoelectric instrumentation complies with Talbot's law, that is, measures the time average. Two different photoelectric measuring systems were investigated for their compliance with Talbot's law: (1) Si photodiode with an integrating digital voltmeter (IDVM) system, and (2) Si photodiode with a lock-in amplifier. The test consisted in comparing values predicted from the amplitude and the duty factor of the chopper with values measured by both systems. It was found that the IDVM system showed satisfactory compliance with Talbot's law, whereas the lock-in system did not. However, a Fourier analysis of the signal wave shape produced correction factors for the lock-in system data which then yielded satisfactory compliance with Talbot's law.

© 1981 Optical Society of America

Original Manuscript: March 18, 1981
Published: August 1, 1981

J. Priu and W. Budde, "Compliance of Si photodiodes with Talbot's law," Appl. Opt. 20, 2676-2682 (1981)

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  1. CIE International Lighting Vocabulary, Publication CIE 17 (Bureau Central CIE, 52 Blvd. Malesherbes, 75008 Paris, 1970).
  2. J. W. T. Walsh, Photometry (Constable, London, 1958).
  3. W. Budde, Appl. Opt. 18, 1555 (1979).
  4. J. Geist, Rev. Sci. Instrum. 43, 1704 (1972).
  5. This counter was a Hewlett-Packard model 5328A Universal Counter. (The identification of products in this paper is done for completeness of the experimental description and does not constitute an endorsement by NRC or imply that this product is the best available for the purpose.)
  6. This IDVM was a Hewlett-Packard/Dymec model 2401C. Unfortunately, HP has discontinued production of this instrument. The 5328A Counter mentioned previously has a DVM option which to some extent can serve as a replacement for the HP 240 1C.
  7. Princeton Applied Research model 186A.

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