QUANTITATIVE RADIANT INTENSITY MEASUREMENTS USING PHOTOGRAPHIC AND ELECTRONIC IMAGING,
Abstract
The subject of this paper is essentially the use of a camera, either photographic or television, for obtaining quantitative radiometric data. Under some conditions the camera is to be preferred to a device such as a radiometer, and often a camera is the only feasible instrument for making radiometric measurements. For measurements using photographic film it is necessary to consider the film characteristics such as the H and D curve, the spectral sensitivity, etc. The special case of the recording of point images is discussed in detail. For this type of image the diameter of the exposed spot on the film grows with the intensity. This technique, used for over 50 years by astronomers, has a large dynamic range and a fair accuracy. Calibration and data reduction methods are explained. Television systems have several advantages such as real time display, magnetic tape recording, and high sensitivity. Some disadvantages are limted dynamic range and low resolution. References are made to recent papers on the use of vidicon and image-orthicon systems for quantitative measurements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1965
- Accession Number
- AD0625855
Entities
People
- Eugene B. Turner
Organizations
- The Aerospace Corporation