A Camera For In SITU Photography Of Atmospheric Cloud Particles From An Armored T-28 Hail Research Aircraft

Theodore W. Cannon; Robert Woltz

doi:10.1117/12.955877

18 November 1977 A Camera For In SITU Photography Of Atmospheric Cloud Particles From An Armored T-28 Hail Research Aircraft

Theodore W. Cannon, Robert Woltz

Author Affiliations +

Proceedings Volume 0125, Advances in Laser Technology for the Atmospheric Sciences; (1977) https://doi.org/10.1117/12.955877
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

A recently developed particle camera operated on the South Dakota School of Mines T-28 weather research armored aircraft has been used to photograph cloud particles in hail precursor and hail producing clouds for the National Hail Research Experiment. The 35 mm camera, located under the port wing, photographs particles within up to nine liters sample volume per exposure at rates up to about 20 exposures per second. Particles of approximately 50 micrometers diameter and larger are imaged at 0.16 magnification with ice/water distinction possible for particles larger than about 100 micrometers. Design features of the camera include: (1) image motion compensating rotating mirror with speed electronically servoed to true airspeed; (2) ratio control for varying the frame rate at typically between one per four seconds up to 20 per sec at 100 m per sec true air-speed; (3) accumulate feature for multiple exposures of up to four per frame and (4) choice of magnifications of 0.16 or 0.6x as appropriate for the size range of particles being studied. Examples of photographs from the 1976 field season are shown. Techniques for camera calibration and automatic data reduction are briefly discussed.

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Theodore W. Cannon and Robert Woltz "A Camera For In SITU Photography Of Atmospheric Cloud Particles From An Armored T-28 Hail Research Aircraft", Proc. SPIE 0125, Advances in Laser Technology for the Atmospheric Sciences, (18 November 1977); https://doi.org/10.1117/12.955877

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