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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 56, Iss. 1 — Jan. 1, 1966
  • pp: 75–79

Absolute Radiation Standard in the Far Infrared

A. J. LICHTENBERG and S. SESNIC  »View Author Affiliations

JOSA, Vol. 56, Issue 1, pp. 75-79 (1966)

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An absolute radiation standard is constructed for use between 200 and 2000 µ. It is demonstrated that the output is that of a blackbody over this wavelength range. The absolute standard is used to calibrate a secondary standard mercury-arc lamp which is found to have an equivalent temperature in the neighborhood of 3000°K. It is shown that absolute standards can be used either to determine the strength of an unknown signal directly or to calibrate the sensitivity of a monochromator-detector system.

A. J. LICHTENBERG and S. SESNIC, "Absolute Radiation Standard in the Far Infrared," J. Opt. Soc. Am. 56, 75-79 (1966)

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  1. G. N. Harding, M. F. Kimmit, J. H. Ludlow, P.Porteous, A. C. Prior, and V. Roberts, Proc. Phys. Soc. (London) 77, 1069 (1961).
  2. A. J. Lichtenberg, S. Sesnic, and A. W. Trivelpiece, Phys. Rev. Letters 13, 387 (1964).
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  8. The restriction of small ø implies that the conical cavity is a blackbody only within a small angle of diverging rays. Since the monochromater used for the measurements accepts only a narrow cone of rays, the requirement was satisfied over the entire acceptance.
  9. J. C. De Vos, Physica 20, 669 (1954).
  10. Equation (3) follows directly from the general principle of conservation of phase space, A. J. Lichtenberg, Nucl. Inst. Methods 26, 243 (1964); but can also be proved geometrically.
  11. From these measurements it is also apparent that a hot glass plate can be used as a standard source, provided that high accuracy is not needed.
  12. For the detector responsivity given in Fig. 9 the radiation is taken to be that entering the LHe Dewar light pipe; thus the attenuation in the light pipe, and the loss in power due to reflection at the InSb crystal and absorption in the windows, are in-included in the over-all responsivity. In contrast, the responsivity reported by Putley does not include these losses. The actual responsivity of the InSb, itself, is at least a factor of 2 larger if these losses are included. However, it has not been possible to determine the losses exactly.

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