Multiple layer caliper measurements using photoisomers

Details Multiple layer caliper measurements using photoisomers Multiple layer caliper measurements using photoisomers

1994-02-08

1995-09-26

Fields, Carolyn E.

Radiant energy

Luminophor irradiation

Methods

250302, 2504581, 356381, G01N 2164

Patent

active

054536251

ABSTRACT:
A method and system is disclosed for measuring a functional characteristic of one or more thin film coatings applied to a thin film using a photoisomer. A photoisomer is mixed into each functional coating in known amounts. Photodetection of the photoisomer as a part of the functional coatings is used to control a functional characteristic of the thin film during the manufacturing process. The photoisomer is activated with light of a selected wavelength range, and light fluorescence is measured in another selected wavelength range.

REFERENCES:
patent: 3341705 (1967-09-01), Alburger
patent: 3956630 (1976-05-01), Mellows
patent: 4250382 (1981-02-01), Libby
patent: 4841156 (1989-06-01), May et al.
Takahide Minami et al., Picosecond Time-Resolved Fluorescence Spectroscopy of the Photochromic Reaction of Spiropyran in Langmuir-Blodgett Films; J. Phys. Chem., 95(10); pp. 3988-3993, 1991.

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