Development and evaluation of an improved efficiency polymeric web point-focus Fresnel lens
The feasibility of producing parquets of point-focus Fresnel lenses with a 2/sup 0/ draft angle on the riser in a continuous polymeric web is described. The parquet produced consisted of 14 square lenses, each 8.16 in. on a side, in a 2 by 7 format. The primary aim was to show that an increased efficiency was possible over that reported in SAND83-7023 by decreasing the draft angle. A secondary aim was also to produce a web of sufficient thickness to be used without lamination to a thick superstrate. The results demonstrated that increased efficiency was realized for both the thin and thick caliper material, with performance nearly equal to a direct-cut control lens. The results also show that a bowing or sagging problem exists in the laminated lenses. They also show that the thicker, non-laminated lenses may not be stiff enough to lie flat and may buckle, causing these lenses to be potentially unacceptable.
- Research Organization:
- Minnesota Mining and Mfg. Co., St. Paul (USA). Optics Technology Center
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6888844
- Report Number(s):
- SAND-86-7046; ON: DE87008887
- Country of Publication:
- United States
- Language:
- English
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