Dynamic refractometer

Details Dynamic refractometer Dynamic refractometer

2006-10-17

2008-11-25

Pham, Hoa Q (Department: 2886)

Optics: measuring and testing

Refraction testing

Prism engaging specimen

C356S128000

Reexamination Certificate

active

07456942

ABSTRACT:
A refractometer computer controls the rotation of a rotary plate upon which are mounted a prism optically coupled via an optical window to a spectroscopic cell holding a resin exhibiting a dynamic refractive index during photocuring. The computer system positions the prism and spectroscopic cell relative to a visible light laser which illuminates the prism-resin interface at selected incidence angles. A photodetector mounted on the plate generates a signal to the computer proportional to intensity of an internally reflected light beam. A curing light is selectively transmitted through the prism and into the photocurable resin. The refractometer determines the intensity of the internally reflected beam a selected incidence angles and determines the effective refractive index curve of the resin at an uncured state and, optionally, at a completely cured state. Next, an amount of uncured resin and selected optical components to be joined by the resin is placed in the spectroscopic cell and irradiated with the UV light. The refractometer is fixed at a selected incidence angle and measures the intensity of an internally reflected light beam of light throughout the cure cycle. The refractometer determines the resin's refractive index of the polymeric mixture by means of extrapolation of a horizontal shift in the effective refractive index curve of the resin from an uncured state to a selected point in the cure cycle.

REFERENCES:
patent: 2807976 (1957-10-01), Vossberg
patent: 4451147 (1984-05-01), Dobes et al.
patent: 4844608 (1989-07-01), Smith
patent: 5565978 (1996-10-01), Okubo et al.
patent: 5617201 (1997-04-01), Kahre
patent: 5757477 (1998-05-01), Nikitin et al.
patent: 5926284 (1999-07-01), Naya
patent: 6097479 (2000-08-01), Melendez et al.
patent: 7283220 (2007-10-01), Huang et al.
patent: 2004/0145731 (2004-07-01), Nakajima et al.
patent: 2006/0188664 (2006-08-01), Ando et al.
Measurement of Thin Film Parameters with a Prism Coupler, Dec. 1973, vol. 12. No. 12, Applied Optics, pp. 2901-2908, R. Ulrich and R. Torge.
Theory of Measurement, Metricon Model 2010 Prism Coupler Thin Film Thickness/Refractive Index Measurement System Operating and Maintenance Guide Rev. (9/91); 1991 Metricon Corp. pp. 7-9.

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