EFFORT TO EVOLVE A METHOD OF EYE PROTECTION FROM FLASH BLINDNESS.
Abstract
The photochemical, thermal and spectral properties of six representative photochromic compounds were investigated in p-dioxane solutions. There appears to be a considerable variance in the important parameters (quantum yield, thermal rate constants, extinction coefficients, etc.) among the different compounds. Substituents in the 5-position on the Fischer's-base part of the BIPS compound can have a great effect on the quantum efficiency. An extensive study was made on the effect of solvent on the thermal and spectral properties of 5',7'-dichloro-6'-nitro BIPS. The findings indicate that these properties can be related to solvent polarity in a consistent manner. It is concluded that the chemical environment can have a profound effect on the performance of a photochromic filter element in an eye-protective device. Some new photochromic dyes, which absorb light over the whole visible spectrum, have been synthesized and studied. One of these compounds (dye No. 557, 8,8'-dinitro SNAP) was found to have excellent photochemical and spectral properties. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1964
- Accession Number
- AD0464983
Entities
People
- Alan J. Kresch
- David B. Mcquain
- Richard E. Bowman
- Richard E. Fox
Organizations
- NCR Corporation