Fiber-Optic Chemical Sensors and Biosensors

Alternative technique for biodiesel quality control using an optical fiber long-period grating sensor

“…On the other hand, some results concerning to the use of chemical sensors based on optical fiber have been reported in the past years 9,10 , which present interesting features that contribute to make its use very attractive as chemical sensors. Among these features are immunity to electromagnetic interference, possibility for spectral multiplexing, reduced weight, small volume, high fusion temperature, measurement wavelength encoded, safety at hazardous or explosive environments, possibility for fast or real time, costeffective and quasi-distributed monitoring of chemical processes (with the use of more than one sensor in the same fiber link).…”

An Optical Thermometer Based on the Delayed Fluorescence of C70

“…It can be seen that the C 70 /polymer systems have some of the highest temperature sensitivities known over a broad temperature range. [2] In order to be useful in practice, a minimum value of 0.5 % K À1 for S R is assumed. With this value, the lower temperature limit is À80 8C for all polymers.…”

“…[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).…”

Optical Chemical Sensor of Lutetium(III) in Water Based On 2-Nitro-6-(thiazol-2-yldiazenyl)phenol Immobilized on Polymethyl meth-acrylate and 2-Nitrophenyl octyl ether Matrix

“…The analyte selective membrane can be changed to optical chemical sensor (optode) by immobilizing the indicator that responds to analyte in a concentration dependent manner [40][41][42]. The optical membrane sensors have been formed by immobilizing the indicator (chromoionophores, ionophores, and fluoroionophores) with or without extractant in the solid matrix applying highly diversified procedures [43][44][45][46].…”