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

Report Date:

1951-07-15

Pagination or Media Count:

16.0

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

Subject Categories:

  • Electrical and Electronic Equipment
  • Air Conditioning, Heating, Lighting and Ventilating
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE