Accession Number : AD0883290

Title :   Expansion Technique for Cary 14 Transittance Measurements.

Descriptive Note : Technical publication,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Olsen, A. L. ; Nichols, L. W.

Report Date : APR 1971

Pagination or Media Count : 13

Abstract : The expansion feature of the transmittance (T) slidewire on the Cary Model 14 spectrophotometer, 0 to 1% T Full Scale, provides an extremely useful technique to measure the magnitude of small, yet significant energy leaks (< 1% T) of sidesbands in interference filters. Of the several optical materials investigated, the optical wedge provided to be the best component to establish the 0 to 1% T range. It is insensitive to temperature changes, has excellent shelf life, is commercially available at a reasonable cost, and can be used over a wide wavelength range. In a test with a neutral density filter, good agreement existed between the values from the 0 to 1% T range and from the 0 to 100% T and 0 to 10% T ranges. The expansion technique takes advantage of the excellent photometric accuracy of the spectrophotometer by providing an improved readability of chart values. (Author)

Descriptors :   (*INFRARED FILTERS, LIGHT TRANSMISSION), (*INFRARED SPECTROPHOTOMETERS, OPERATION), TEST METHODS, LABORATORY EQUIPMENT.

Subject Categories : Test Facilities, Equipment and Methods
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE