Applications in chemical sensing

Miniaturized and robust optical fiber sensors capable of accurate and reliable measurement of refractive index of the surrounding environment have attracted tremendous interest in recent years. One of the driving forces for the development of these fiber optic devices is their broad applications in chemical sensing. When placed in the liquid solution or gas mixture, these fiber sensors can detect the chemical composition change by monitoring its refractive index variation. These... 

A single optical fibre cannot be a suitable tool for the last mentioned application as well as for many others arranged in the reflection layout. For these applications individual optical fibres are collected to sets - bundles. Such optical elements are particularly convenient for image transmission. In chemical sensing, fibre bundles can be employed for remote Raman, fluorescence or absorption spectroscopy4,40, for visualisation etc. The... 

It is especially fitting that this Course on Optical Chemical Sensors should be the occasion to recollect the early days of the laser and honor those whose vision and brilliance opened up such a rich and productive area of science. Laser-based chemical sensors serve as valuable research tools while at the same time they have found many practical applications - in this sense, they offer a representative snapshot of the entire field of masers and... 

Modal Transition in Nano-Coated Long Period Fiber Gratings Principle and Applications to Chemical Sensing... 

In this section, we present an application to chemical sensing of the nano-sized HRI-coated LPGs. This time the sPS overlay is used both as HRI material to enhance the sensitivity of the LPG and as a selective molecular sieve to collect... 

Chapter 10, Ion Mobility Spectrometry, describes one of the most commonly used technologies in chemical sensing systems, with specific application to explosives, the one perhaps currently most used in portable systems. 

Semiconductor band-gap luminescence results from excited electrons recombining with electron vacancies, holes, across the band gap of the semiconductor material. Electrons can be excited across the band gap of a semiconductor by absorption of light, as in photoluminescence (PL), or injected by electrical bias, as in electroluminescence (EL). Both types of luminescence have been used in chemical sensing applications [1,3]. 

It may be of interest to observe here that mathematical chemists have often applied and even sought after branches of mathematics that have tended to be overlooked by the chemical community at large. This is not to imply that the mathematics itself is necessarily new — in fact, it may be quite old. What is new is the application to chemistry this is why the word novel was employed in our earlier definition of mathematical chemistry. The thrill of discovering and developing some novel application in this sense has been an important source of motivation for many mathematical chemists. The other adjective used in our definition of mathematical chemistry, i.e., nontrivial, is also worthy of brief comment. To yield profitable new insights, the mathematics exploited in a chemical context usually needs to be of at least a reasonably high level. In an endeavor to maintain a uniformly high level, we shall seek... 

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