Abstract

Diffraction phenomena in acoustic fields of ultrasonic frequency in air have been photographed by schlieren technique and by shadow methods employing a spark of extremely short duration. Variations of intensity in the field are observed in the immediate vicinity of apertures and obstacles as indicated by theoretical treatment of the problem in a more rigorous manner than that of Kirchhoff.

© 1947 Optical Society of America

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References

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  1. Sommerfeld, Math. Ann. 47, 317 (1896).
    [Crossref]
  2. Morse and Rubenstein, Phys. Rev. 54, 895 (1938).
    [Crossref]
  3. Andrews, Phys. Rev. 71, 777 (1947).
    [Crossref]
  4. Compare, e.g., Osterhammel, Akustsche Zeits. 6, 73 (1941).
  5. Alleman, Dissertation, Johns Hopkins University, 1938;Phys. Rev. 55, 87 (1939).
    [Crossref]
  6. Beams, Kuhlthau, Lapsley, McQueen, Snoddy, and Whitehead, J. Opt. Soc. Am. 37, 868 (1947).
    [Crossref] [PubMed]
  7. Pohlmann, Naturwiss. 23, 511 (1935).
    [Crossref]

1947 (2)

1941 (1)

Compare, e.g., Osterhammel, Akustsche Zeits. 6, 73 (1941).

1938 (1)

Morse and Rubenstein, Phys. Rev. 54, 895 (1938).
[Crossref]

1935 (1)

Pohlmann, Naturwiss. 23, 511 (1935).
[Crossref]

1896 (1)

Sommerfeld, Math. Ann. 47, 317 (1896).
[Crossref]

Akustsche Zeits. (1)

Compare, e.g., Osterhammel, Akustsche Zeits. 6, 73 (1941).

J. Opt. Soc. Am. (1)

Math. Ann. (1)

Sommerfeld, Math. Ann. 47, 317 (1896).
[Crossref]

Naturwiss. (1)

Pohlmann, Naturwiss. 23, 511 (1935).
[Crossref]

Phys. Rev. (2)

Morse and Rubenstein, Phys. Rev. 54, 895 (1938).
[Crossref]

Andrews, Phys. Rev. 71, 777 (1947).
[Crossref]

Other (1)

Alleman, Dissertation, Johns Hopkins University, 1938;Phys. Rev. 55, 87 (1939).
[Crossref]

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Figures (16)

F. 1
F. 1

Schematic detail of crystal mounting.

F. 2
F. 2

a. Box for producing spark-shadow pictures. b. Detail of spark gap.

F. 3
F. 3

Instantaneous spark-shadow picture of crystal radiating into free space.

F. 4
F. 4

Diagrammatic arrangement for obtaining schlieren photographs.

F. 5
F. 5

Schlieren photograph of sound field from crystal radiating into free space.

F. 6
F. 6

Diffraction of sound field at straight edge (spark-shadow graph).

F. 7
F. 7

Diffraction at straight edge (schlieren).

F. 8
F. 8

Diffraction by slit 5λ in width (spark-shadow graph).

F. 9
F. 9

Diffraction by slit 2λ in width (spark-shadow graph).

F. 10
F. 10

Diffraction by slit λ in width (spark-shadow graph).

F. 11
F. 11

Diffraction by slit 4 1 2 λ in width (spark-shadow graph).

F. 12
F. 12

Diffraction by slit 5λ in width (schlieren).

F. 13
F. 13

Diffraction by cylinder (wire) 2 3 λ in diameter and 2λ above crystal (schlieren).

F. 14
F. 14

Diffraction by cylinder 4/3λ in diameter and 2λ above crystal (schlieren).

F. 15
F. 15

Diffraction by cylinder 4/3λ in diameter and 2 1 4 λ above crystal (schlieren).

F. 16
F. 16

Diffraction by cylinder 4/3λ in diameter and 2 1 4 λ above crystal (spark-shadow graph).