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

Focal Plane Diffraction Anomalies in Telescopic Systems*

A. I. Mahan
J. Opt. Soc. Am. 37(10) 852-867 (1947)

The Diffuse Spectral Reflectance of Paints in the Near Infra-Red

J. A. Sanderson
J. Opt. Soc. Am. 37(10) 771-777 (1947)

A Study Concerning Characteristics of the High-Voltage a.c. Arc

E. A. Boettner and C. F. Tufts
J. Opt. Soc. Am. 37(3) 192-198 (1947)

Stray Light Caused by the Presence of a Luminous Body within the Field of an Optical System*

Howard S. Coleman
J. Opt. Soc. Am. 37(11) 899-906 (1947)

Method of Computing Correction Plate for Schmidt System for Near Projection, with Special Reference to System for Television Projection

H. S. Friedman
J. Opt. Soc. Am. 37(6) 480-484 (1947)