Luminescence system and method for determining the nature of sub

Details Luminescence system and method for determining the nature of sub Luminescence system and method for determining the nature of sub

1989-05-26

1991-08-13

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

2504581, G01N 2164

Patent

active

050392190

ABSTRACT:
Disclosed is an integrated, multi-module luminescence measuring system. The system can selectively conduct lifetime decay or steady-state measurements of light emitted by a sample which receives exitation light. The system includes: a sample chamber which directs monochromatized, focused excitation light from a selected source at a selected sample and directs any resultant emitted light through a monochromator to either a first gated photodetector or a second regular photodetector. Also present is a reference module with a regular photodetector which may selectively receive a portion of the excitation light. A lifetime decay detector module pulses a selected light source and the gated photodetector so that a converter produces digital signals related to output signals from the photodetector, the digital signals representing the integral of the intensity of the emitted light over a selected time. A steady-state detector module pulses a selected light source and includes a resettable integrator-A/D converter combination which receives the output from the regular photodetectors and produces digital signals representing the integrals over varying time intervals of such outputs. The integrator is reset and the A/D convertor is turned on whenever the light source is pulsed. A data processing module controls sample selection, the wavelengths of the excitation and emitted lights, light source selection, the number and time-width of the various integrations, and the storage and processing of the resulting digital signals.

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Braumik et al. "Stroboscopic Time-Resolved Spectroscopy", Rev. Sci. Inst., vol. 36, #1, Jan. 65, pp. 37-40.
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Tuan et al., High Resolution Luminescence Spectrometer Applied Optics, vol. 12, #6, Jun. 1973, pp. 1286-1292.
Strambini et al., A Flash Apparatus for Time-Dependent Phosphorescence Measurements, A Spectroscopic Aid, Canadian Jour. of Spectroscopy, vol. 21, #1, Jan.-Feb. 1976, pp. 1-5.

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