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Roger Main gives a four‐part report on the optical technologies which are playing an increasingly important role in sensor development.

The use of fibre optics for long haul telecommunication applications is well established in both systems design and extensive field installation trials. The main advantage of fibre optics in this particular area are low loss and high transmission bandwidth capabilities.

FIBRE OPTICS — the science of ‘bending’ light — may well have a revolutionary effect on many aspects of airports in the next few years.

Optical fibre sensors are finding wide applications in biotechnology and medicine, as a European specialist explains.

That are the responsibilities of facilities managers and within what boundaries and contexts do they undertake them? A common talking point in the facilities management press and on the conference circuit, the question still begs an answer.

Discusses intelligent materials, intelligent material‐based sensors, their transducing methods, and different kinds of transducers used with smart material‐based sensors. Assumes that the future of intelligent sensors will almost totally depend on intelligent chemistry and intelligent instrumentation. Molecular recognition will widen the horizons of smart systems with the help of VLSI‐based design and fabrication. Discusses different sensor mechanisms, such as ENFETs, immunoFETs, ISFETs and chemFETs and takes a detailed look at potentiometric, amperometric and optical biosensors.

This paper aims to describe the techniques used in industrial optical chemical sensors and to consider future prospects.

This paper discusses the techniques and technologies used in today's optical chemical sensors. It highlights their limitations and considers briefly certain new technological developments.

This paper shows that techniques such as wet reagent‐aided photometry, UV absorption, spectroscopy and UV fluorescence satisfy a range of industrial chemical sensing applications and that optode technology is making limited commercial inroads. It identifies the need for inexpensive, wet reagent‐free chemical sensors and suggests that both solid‐state electrodes and lab‐on‐a‐chip devices may ultimately resolve this issue.

This paper provides a technical insight into the state of optical chemical sensing and illustrates that generic families of inexpensive chemical sensors are yet to be developed.

The purpose of this paper is to propose and demonstrate a simple yet accurate optical fibre based sensor capable of performing micron and sub‐micron thickness measurement.

The proposed sensor consists of a multimode plastic probe, three He‐Ne lasers and translation stages along with a silicon photodiode and a lock‐in amplifier to measure the output voltage as the displacement of the sensor is increased.

The system operating with a source wavelength of 633 nm can provide measurements of up to 3 μm with a sensitivity of 0.0054 mV/μm.

The thickness of the sample can be obtained from a linear equation correlating the thickness of the sample to the displacement of the sensor at which the peak output voltage is obtained, or by correlating the thickness of the sample directly to the peak output voltage measured.