Holographic technology for solar energy concentration. Final report and 1983 annual report

Technical Report · Sun Jul 01 04:00:00 EDT 1984

OSTI ID:5456754

Jannson, T

The objective of 3-year R and D project has been to explore the possibility of using dichromated-gelatin holographic technology for solar energy concentration. Special emphasis has been given to spectrum-splitting holoconcentrators based on the stack of sub-holograms focusing adjusted parts of solar spectrum to various photocells with different band-gaps. Reflection Bragg holograms have been preferred because of low chromatic dispersion and flatter shape of spectral characteristics. During the last year, significant progress has been made in the photochemistry, physics and optics of the holoconcentrators. It was verified that in Lippmann geometry, the reflectivity of the selective holographic mirrors can reach at least 99.9%, i.e., the photochemistry of the dichromated gelatin to a good approximation preserves the physical properties of reflection Bragg holograms. In holoconcentrator geometry, the hologram diffraction efficiency, limited only by Fresnel losses, has been obtained (up to 92%) and it was shown that in the case of zero-dispersion gratings with curved holographic coatings, the optical efficiency of the holoconcentrator system can reach this value. Hence, the holoconcentrator systems can be uniquely very close to the ideal PV spectrum-splitting systems. Moreover, several additional attractive holographic applications, such as high-efficiency selective reflective filters, holographic mirrors for long-path multi-gas optical sensors, heat holowindows and laser-protection selective mirrors, have been developed.

• Research Organization: National Technical Systems, Los Angeles, CA (USA). Research Div.
• DOE Contract Number: AC03-81ER10836
• OSTI ID: 5456754
• Report Number(s): DOE/ER/10836-T1; ON: DE85005486
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140501* -- Solar Energy Conversion-- Photovoltaic Conversion
BRAGG REFLECTION
COATINGS
COMBINED COLLECTORS
CONCENTRATOR SOLAR CELLS
DIRECT ENERGY CONVERTERS
EFFICIENCY
EQUIPMENT
FILTERS
HOLOGRAPHY
IMAGES
MATHEMATICAL MODELS
OPTICAL FILTERS
OPTICAL PROPERTIES
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
PHYSICAL PROPERTIES
REFLECTION
REFLECTIVITY
SOLAR CELL ARRAYS
SOLAR CELLS
SOLAR COLLECTORS
SOLAR EQUIPMENT
SPECTRAL REFLECTANCE
SPECTRALLY SELECTIVE SURFACES
SURFACE PROPERTIES
SURFACES
TRANSMISSION