Development of a second generation portable specular reflectometer

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5198102

Freese, J M

The second generation design of a portable specular reflectometer developed by Sandia National Laboratories (SNL) has been completed together with a detailed drawing package. Two prototype instruments have been fabricated and evaluated. It has been demonstrated that the instruments respond linearly (+-0.006 transmission units) to variations in the intensity of incident and reflected beams and that the readings are not affected by the presence of stray light. As a result of this feature, the reflectometer is well suited for outdoor field use in a normal sunlight environment. A drift problem due to temperature was observed in the detector/preamp at temperatures > 100/sup 0/F. This drift would probably be eliminated by redesign of the detector/preamp circuitry. A major improvement in the second generation reflectometer is the use of larger optics to allow averaging over a greater surface area (approx. 1 cm/sup 2/) of a mirror. The new reflectometer has the capability of a straight-through beam configuration, allowing direct determination of the signal level corresponding to 100% reflectance. This capability also allows the user to measure the specular transmittance of materials. A microprocessor can be added to the output of the detector as an option to display percent reflectance values and mean and standard deviations of measurements made.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5198102
• Report Number(s): SAND-80-1509C; CONF-800955-4
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
ALUMINIUM
ELEMENTS
EQUIPMENT
FILMS
GLASS
LIGHT TRANSMISSION
MATERIALS
MEASURING INSTRUMENTS
METALS
MICROPROCESSORS
MIRRORS
OPTICAL EQUIPMENT
OPTICAL PROPERTIES
PERFORMANCE
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
PLASTICS
SOLAR CONCENTRATORS
SOLAR EQUIPMENT
SOLAR REFLECTORS
SPECTRAL REFLECTANCE
TEMPERATURE EFFECTS