Radiant energy – Luminophor irradiation – Methods
Patent
1987-02-24
1989-03-28
Wan, Gene
Radiant energy
Luminophor irradiation
Methods
356311, G01K 1120, G01J 330
Patent
active
048166871
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: Re31832 (1985-02-01), Samulski
patent: 4296318 (1981-10-01), Mezzetti et al.
patent: 4652143 (1987-03-01), Wickersheim et al.
Grattan et al., "Fire-Optic Absorption Temperature Sensar Using Fluorescence Reference Channel", Rev. Sci. Instrum., vol. 57, No. 6, Jun. 1986, pp. 1175-1178.
Fehrenbach Gustav
Schafer Wolfgang
Degussa - AG
Wan Gene
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