Method of measuring refractive indices of lens and sample liquid

Details Method of measuring refractive indices of lens and sample liquid Method of measuring refractive indices of lens and sample liquid

1991-05-28

1992-09-29

Rosenberger, Richard A.

Optics: measuring and testing

Refraction testing

356124, 356361, G01B 900, G01B 1100

Patent

active

051517523

ABSTRACT:
A method of measuring a refractive index distribution of a lens is disclosed which comprises, immersing a glass sample and a lens under test within a matching fluid whose refractive index differs slightly from that of the glass to be tested, the glass sample having a refractive index and a shape which are both known and the lens to be tested having an unknown refractive index but a known shape, allowing coherent light to pass through the glass sample and the lens under test; superposing the transmitted light wave on a reference light wave to generate interference fringes, outputting the intensity distribution of interference fringes that are generated by the light wave that has passed through the glass sample, determining the refractive index of the matching fluid on the basis of the resulting output, outputting the intensity distribution of interference fringes that are generated by the light wave that has passed through the lens under test; separating from the resulting output the defocus term and aberration terms in the polynomial which expresses the produced interference fringes; determining the average refractive index of the lens under test from the separated defocus term and the refractive index of the matching fluid; and determining the refractive index distribution of the lens under test from the aberrations terms.

REFERENCES:
patent: 4361402 (1982-11-01), Costa
patent: 4565449 (1986-01-01), Grego
patent: 4759628 (1988-07-01), Tatsuno et al.
"Polyolefin System Resin," vol. 38, No. 7, pp. 41-44.
"Refractive Index of Plastic Lens," Optics, vol. 12, No. 6, pp. 460-463, Dec. 1983.

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