Accession Number : AD0779822

Title :   Visual Magnitude Flux Rate Density Standards for Sunlight Incident on Photoemissive Surfaces.

Descriptive Note : Technical note,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Weber,Robert

Report Date : 06 MAY 1974

Pagination or Media Count : 25

Abstract : Based on the spectrum of the 'real' sun, a zero visual magnitude photon flux rate density of 5.00 x 10 to the 10th power p/sq. m-sec is calculated for a bandwidth of 0.300 micrometer to 0.920 micrometer, a range corresponding to the useful responsivity-bandwidths of both S-20 and S-25 photosurfaces. Over this bandwidth, the average quantum efficiencies of the photosurfaces are shown to agree to within 0.1 percent at a value of 7.2 percent. Finally, photon and photoelectron flux rate densities are calculated for sources of varying visual magnitudes and for transmission through one to five standard air masses. (Author)

Descriptors :   *PHOTOCATHODES, *PHOTOELECTRIC EFFECT, PHOTONS, FLUX(RATE), SUNLIGHT, QUANTUM EFFICIENCY

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE