Fiber-Optic Temperature Sensor Using Fluorescence Decay Time

Th. Bosselmann; A. Reule; J. Schroder

doi:10.1117/12.945072

12 November 1984 Fiber-Optic Temperature Sensor Using Fluorescence Decay Time

Th. Bosselmann, A. Reule, J. Schroder

Proceedings Volume 0514, 2nd Intl Conf on Optical Fiber Sensors: OFS'84; (1984) https://doi.org/10.1117/12.945072
Event: 2nd International Conference on Optical Fiber Sensors, 1984, Stuttgart, Germany

Abstract

Many different principles for temperature measurement with fiber-optic sensors have been suggested and brought about experimentally. If we restrict ourselves to the use of sensors employing fluorescence decay time, the first proposal was made by K.A. James et al. (1). They suggest exciting fluorescence by a flash and measuring the intensity of the decaying fluorescent light and determining the point of time at which the intensity has decreased to 1/e of the starting value. Except if laser flashes are used for excitation, measurement according to this principle will surely be very inaccurate as a result of noise. McCormack (2) sinusoidally modulates the exciting light with a fixed frequency and measures the phase shift of the fluorescent light sinusoidally oscillating at the same frequency. The accuracy achievable referred to the intensity of the exciting light is probably better; however, it is difficult to measure any phase shift very exactly.

Citation Download Citation

Th. Bosselmann, A. Reule, and J. Schroder "Fiber-Optic Temperature Sensor Using Fluorescence Decay Time", Proc. SPIE 0514, 2nd Intl Conf on Optical Fiber Sensors: OFS'84, (12 November 1984); https://doi.org/10.1117/12.945072

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