A Direct Method of Measuring the Intensity of Light and Other Radiation Sources Without Knowledge of the Source Distance
Abstract
Aircraft and artillery flares are tested at various proving ground and test areas. These tests are used to compare flares and flare systems and to evaluate optimum methods of deployment for tactical use. The two most significant parameters measured are the illumination produced by the item and its candlepower. The illumination produced by a flare source can be directly measured by means of photocell. However, to obtain candlepower it is necessary to know the distance from the source to the transducer. This is due to the inverse square law relation E - I/D(2), where E is illumination in terms of foot-candle, I is intensity in candlepower and D is distance in feet. In addition, unless the cell is always aimed in the direction of the flare source it is also necessary to know the angle of the cell's active surface in relation to the flare's position. This is necessary to correct for the sensitivity due to loss in effective surface area.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 14, 1978
- Accession Number
- ADD006415
Entities
People
- Chester L. Smith
- David N. Everswick