Method and apparatus for measurement of the fluorescence relaxat

Details Method and apparatus for measurement of the fluorescence relaxat Method and apparatus for measurement of the fluorescence relaxat

1990-01-03

1991-08-27

Hannaher, Constantine

Radiant energy

Luminophor irradiation

2504591, 356311, G01J 508, G01J 554

Patent

active

050435850

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.

REFERENCES:
patent: 4245507 (1981-01-01), Samulski
patent: 4448547 (1984-05-01), Wickersheim
patent: 4560286 (1985-12-01), Wickersheim
patent: 4652143 (1987-03-01), Wickersheim et al.
patent: 4708494 (1987-11-01), Kleinerman
patent: 4752141 (1988-06-01), Sun et al.
patent: 4789992 (1988-12-01), Wickersheim et al.
patent: 4816687 (1989-03-01), Fehrenbach et al.

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