Radiation imagery chemistry: process – composition – or product th – Holographic process – composition – or product
Patent
1996-06-28
1997-12-16
Angebranndt, Martin
Radiation imagery chemistry: process, composition, or product th
Holographic process, composition, or product
430 2, 359 1, 359 3, 359 30, 2504821, G03H 104
Patent
active
056983433
ABSTRACT:
A new personal laser dosimetry badge records intentional or unintentional exposure to laser radiation. A Fresnel biprism is mounted over a layer of photopolymerizable material, preferably a polymer-dispersed liquid crystal material. A laser beam striking the apex of the biprism splits into two beams crossing at an angle which depends on the prism apex angle and the angle of incidence. These crossed beams form an interference pattern at the photopolymer with bright and dark fringes separated by a distance which depends on wavelength and the crossing angle of the two beams. The light triggers a photopolymerization reaction in the bright regions and records a permanent refractive index modulation, a hologram, which serves as a record of the laser interference pattern. Light incident normally on the badge will produce a normal index grating. Light incident at an angle will produce a slanted grating. An aperture at the front of the badge limits the irradiation area and the grating is recorded on the corresponding spot on the photopolymer determined by the badge geometry. The energy dosage of the laser can be determined from the peak diffraction efficiency of the resulting hologram.
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Crane Robert L.
Natarajan Lalgudi V.
Sutherland Richard L.
Tondiglia Vincent P.
Angebranndt Martin
Kundert Thomas L.
Sinder Fredric L.
The United States of America as represented by the Secretary of
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