A NEW METHOD FOR PHOSPHORESCENCE MEASUREMENTS IN THE PRESENCE OF SCATTERED LIGHT
Marta Valledor, Juan Carlos Campo, Miguel A. Perez, Juan C. Alvarez, Juan C. Viera
Abstract:
Phosphorescent sensors are usually based on measurement of light intensity or lifetime of sensor emitted light. This goal may be accomplished by measuring the phase-shift between the excitation and the emitted light. Scattered signals must be removed to perform the measurement; however, some of the scattered light due to fluorescence is impossible to remove when measuring phosphorescence decay times. In this paper, a new method to measure lifetime in the presence of fluorescence light emitted by the phosphorescence sensor is presented. This method is based on the measurement of the phase-shift at two different frequencies. Theoretical aspects, the optimal frequencies and experimental results are discussed.
Keywords:
Phosphorescence, phase modulation, background fluorescence
Download:
PWC-2003-TC2-004.pdf
DOI:
-
Event details
Event name:
XVII IMEKO World Congress
Title:

Metrology in the 3rd Millennium

Place:
Dubrovnik, CROATIA
Time:
22 June 2003 - 28 June 2003
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