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:

1971-04-01

Pagination or Media Count:

13.0

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