Accession Number : AD0657618

Title :   A PHYSICAL COMPARATOR FOR THE COLOR TEMPERATURES OF INCANDESCENT LAMPS.

Descriptive Note : Technical rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD ENGINEERING LAB

Personal Author(s) : King,E. J. ; Snider,A. E. ; Hamburger,F. , Jr

Report Date : 15 JUL 1951

Pagination or Media Count : 16

Abstract : An apparatus was assembled and used to evaluate the color temperatures of incandescent tungsten lamps by physical comparison techniques. A red-to violet ratio method of establishing the effective slope of the radiometric function is utilized. The apparatus uses a single 931-A photomultiplier to receive radiations from the 'standard' and 'unknown' lamps through red and violet filters sequentially. Resultant oscilloscope patterns are judged for equality. Accurate results can be obtained in a short period of time, thus permitting large quantities of lamps to be calibrated with a minimum of effort. (Author)

Descriptors :   (*COMPARATORS, *INCANDESCENT LAMPS), LIGHT, COLORS, TEMPERATURE, PHOTOMULTIPLIER TUBES, OPTICAL FILTERS, CALIBRATION

Subject Categories : Electrical and Electronic Equipment
      Air Condition, Heating, Lighting & Ventilating
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE