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

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PWC-2003-TC2-004.pdf

DOI

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IMEKO TC

TC2 - Photonics

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