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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 62, Iss. 7 — Jul. 1, 1972
  • pp: 902–906

Optical Design of Anechoic Chambers

ROBERT O. DELL, CLINTON R. CARPENTER, and C. L. ANDREWS  »View Author Affiliations

JOSA, Vol. 62, Issue 7, pp. 902-906 (1972)

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With the goal of producing larger working regions of uniform irradiance and phase in microwave anechoic chambers, we have built a disassemblable, tapered chamber in which to study the effects of (a) source size and (b) source position. Recognizing that the long walls of tapered anechoic chambers are partially reflecting mirrors, we have developed an elementary theory for optical design of chambers, and made computations that agree with microwave experiments. To design wider plateaus of irradiance in the working region, we have used computer programs for the interference patterns produced by the primary source and the multiple-image virtual sources.

ROBERT O. DELL, CLINTON R. CARPENTER, and C. L. ANDREWS, "Optical Design of Anechoic Chambers," J. Opt. Soc. Am. 62, 902-906 (1972)

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  1. C. L. Andrews and C. R. Carpenter, J. Opt. Soc. Am. 60, 741A (1970).
  2. C. R. Carpenter and C. L. Andrews, J. Opt. Soc. Am. 60, 742A (1970).
  3. A. Golab and C. L. Andrews, Am. J. Phys. 39, 121 (1971).
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  5. Available from Emerson and Cuming, Inc., Microwave Products Division, Canton, Mass., as Eccosorb SPY and from B. F. Goodrich, Sponge Products, Shelton, Conn., as type VHP.
  6. Available from B. F. Goodrich as type HV-4 and from Emerson and Cuming as a thinner Flexible Foam Absorber as a type AN series.
  7. S. Galagan, Microwaves 9, 44 (1970).
  8. W. H. Emerson and H. B. Sefton, Proc. IEEE 53, 1079 (1965).
  9. Available from Emerson and Cumings, Inc.
  10. Paul Drude, The Theory of Optics, translated by C. R. Mann and R. A. Millikan (Dover, New York, 1959).
  11. V. M. Kulkarni, Am. J. Phys. 28, 317 (1960).
  12. Chung-Heng Liu, Am. J. Phys. 30, 380 (1962).
  13. Because of the angular dependence of the horn field pattern, and because images farther from the source represent rays that have encountered the absorbing material more times and at smaller angles of incidence, image intensity decreases with distance of the image from the source. Images are neglected if their intensities fall below preset tolerances.

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