Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000530
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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1949 SCHLIEREN PHOTOGRAPHY 527 With the additional phase change k$(x\ the complex amplitude of the light vector at a point y in the F plane is then given by G(y) const (6) -A For future mathematical simplicity the effect of the wind tunnel can be represented by a complex function f(x) whose amplitude gives the light-transmission characteristics of the aperture and whose phase is k<j>(x). Since no light is transmitted outside the aperture |/(a;)| = 0, \x\ >A \f(x}\ = 1, \x\ < A f(x) = |/(z)|e^(*) (6) can be rewritten as G(y} = const f^ f (xW**(x)dx. (7) •u •s,. X Y 2 Fig. 3 — Schematic diagram of the image formation in a schlieren system. It can be shown8 that (7) can be transformed into f(x) = const f_^ G(y}e-ik*(x)dy (8) where f(x) and G(y) are known as Fourier transforms of each other. Equations (7) and (8) indicate that if the object f(x) is known the diffraction pattern G(y) can be calculated, and conversely, if the diffraction pattern G(y) is known, the object f(x) that gave rise to it can be calculated. This result may be interpreted to mean that a given object f(x) will give rise to a diffraction pattern G(y) which will then illuminate some