Journal of the Society of Motion Picture and Television Engineers (1950-1954)

Record Details:

Title:
Journal of the Society of Motion Picture and Television Engineers
Date:
1950-1954
Publisher:
Easton, Pa. : The Society
Volume:
Journal of the Society of Motion Picture and Television Engineers
Leaf #:
000218
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Date Added:
July 19, 2022
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Intensity Transmitted: 7 = COS2 irt /O where t = retardation in waves. For an arbitrary bias point and sinusoidal modulation: I 1 , 1 r J~ ~ 2 2 S cos(0<s sm wt) — sin 0o sin (05 sin o>/)] where 0$ = 2ir (retardation caused by modulated signal), and 0o = 2ir (retardation caused by the bias plate). Expanding in a Bessel Series: i \ ri -i j = o ~f~ cos ^° 9 ^Q^s' ~f~ ^2(^«) cos 2ut + ^4(0^) cos 4<*)t + . . . — sin 0o[^i(0s) sin ut + Js(6s) sin 3co£ + . . .] choose the bias plate 0o = ir/2 .'. cos 0o = 0 and all even harmonics vanish. Fig. 4. Transfer characteristic relationships. 100 75 OPTIC 6/AS D. C. VOLTAGE APPLIED Fig. 5. Transfer characteristic. 5 shows a plot of the transfer characteristics with a proper bias point. This point is labelled optical bias since it is not obtained by d-c biasing the crystal, but rather by inserting a mica quarter-wave plate between the polarizer and crystal. Substitution in these relationships indicates that for 74% modulation, the second harmonic distortion is zero, and the third harmonic distortion is approximately 2.2% of the fundamental component. As the percentage modulation is increased, this figure rises rapidly, and thus the nominal modulation level for proper light valve operation is 75%. Of course, nonlinear electrical amplifiers may be included in the sound system allowing higher percentage modulation. Dressier and Chesnes: Electrooptic Recording 209