Method and apparatus for measurement of the fluorescence relaxation period of a fluorescent substance
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United States of America Patent
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Aug 27, 1991
Grant Date -
N/A
app pub date -
Jan 3, 1990
filing date -
Jan 3, 1990
priority date (Note) -
Expired
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Abstract
The subject of the present invention consists of a method and an apparatus for measurement of the fluorescence relaxation period of the radiation of a fluorescent substance whose fluorescence relaxation period is a function of at least one physical parameter. The fluorescence radiation is fed back to the output radiation in a regulating circuit, whose regulating parameter is a parameter for the physical parameter. This is accomplished by advancing the fluorescence radiation to a photoelectric receiver whose output signals are supplied to a voltage controlled oscillator following phase-sensitive rectification and integration. The fluorescence radiation is alternately phase-sensitively rectified only during the relaxation phase. The total durations of the different rectification periods in the two directions are identical. The alternatingly rectified signals are integrated.
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