Accession Number : AD0699582

Title :   SUPPLEMENTARY INVESTIGATIONS ON THE ALLISON METHOD OF CHEMICAL ANALYSIS.

Descriptive Note : Final rept. Jan 66-Jun 69,

Corporate Author : DAYTON UNIV OHIO RESEARCH INST

Personal Author(s) : Mildrum,Herbert F.

Report Date : AUG 1969

Pagination or Media Count : 163

Abstract : The report describes the supplementary experimental considerations and detection investigations conducted on the Allison effect apparatus for chemical analysis. The magneto-optic apparatus employed by Allison has been well documented. Extremely dilute solutions of water soluble chemical compounds could be effectively identified by an observer visually monitoring a low intensity light image developed by the apparatus. The inherent electrical behavior of an Allison effect apparatus has been updated by using modern high speed oscillographic techniques and frequency selective equipment. Information from this report was used as a basis for the final development of a synchronized light pulse and electrical discharge system to effectively replace the normal Allison spark-gap system. This approach was dictated by the considerations given to the practical application of modern photodetection and photographic recording, and photographic analysis techniques to the observation of the Allison effect minima. The results of these applications were negative with regard to the detection of a light intensity change attributable to Allison minima. However, there is sufficient indication that the Allison effect minima may not be an intensity change at all, but instead a change in light energy distribution of the image. It is concluded that in this application based on the indicated observations, an interference technique would be more advantageous for a real-time indication of the light redistribution due to an Allison minima. (Author)

Descriptors :   (*MAGNETOOPTICS, *CHEMICAL ANALYSIS), DESIGN, LABORATORY EQUIPMENT, PHOTOGRAPHIC RECORDING SYSTEMS

Subject Categories : Physical Chemistry
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE