TIME RESOLVED SPECTROSCOPY VIA A FAST PHOTON COUNTING PHASE FLUORIMETER
Abstract
A fast digital correlator is the center of a cavity dumped laser-based photon counting phase fluorimeter capable of modulation frequencies to 35 MHz. The correlator is constructed from standard analog and transistor-transistor-logic components, all impedence matched, driving commercial double balanced mixers as gates to the photoelectron counts from the detector. Extensive discussion of the electronic design criteria is included. The use of the fluorimeter in chemical analysis is then considered. The temporal, concentration, and frequency response of the system are determined. The application of the instrument to mixture analysis is discussed, the limitations on the technique being the focus of the investigation. The subsequent sections deal with a faster correlator capable of modulation frequencies as high as 100 MHz in the implemented version, and 350 MHz with simple modifications to the peripheral instrumentation.
Degree
Ph.D.
Subject Area
Analytical chemistry
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