Fiber Optic Fluorescence Thermometry

Optical Fiber Sensors: An Overview

“…This technique has been investigated using a relatively large number of sensing materials in a variety of forms, including phosphors, bulk samples, and doped optical fibers. (Grattan & Zhang, 1995;Rai & S.B. Rai, 2007) The fluorescence intensity ratio (FIR) technique involves utilizing the fluorescence intensities from two closely spaced energy levels for monitoring the temperature.…”

An Optical Thermometer Based on the Delayed Fluorescence of C70

“…[1] Given that luminescence can be both excited and measured optically, luminescence-based remote temperature sensors have advantages over contact temperature sensors in applications where electromagnetic noise is strong or it is physically difficult to connect a wire as there is no contact with the medium in the sensing process. [2][3][4] Furthermore, temperature imaging using planar sensors is easily achieved in this way. Additional advantages of a luminescence-based thermometer are the usually fast response and the spatial resolution that can extend from the macroscale (in the case of luminescent paints) down to the nanoscale (such as in fluorescence microscopy).…”

“…In these systems, the decay times and intensities almost invariably decrease with an increase in temperature owing to thermally activated quenching processes. [4][5][6][7][8][9] The common mechanism of molecular fluorescence [10] is prompt fluorescence (PF) in which emission occurs after S n ! S 0 absorption and excited-state relaxation to S 1 .…”

A Molecular Thermometer Based on the Delayed Fluorescence of C70 Dispersed in a Polystyrene Film

“…Further advantages of the molecular fluorescence 1 Centro de Química-Física Molecular, Instituto Superior Técnico, 1049-001 Lisboa, Portugal. 2 To whom correspondence should be addressed.…”

“…There are several thermal sensors based on molecular optical properties, namely luminescence. The use of fiber optics in conjugation with phosphors, whose luminescence lifetime changes with temperature, is a wellestablished method [1]. More recently, several studies have been devoted to fluorescence molecular thermometry [2][3][4][5], including one molecular thermometer based on the fluorescence quenching of fullerene C 60 dispersed in a polymer (PMMA) film [6].…”