Development of a fibre-optic stress cell for geotechnical applications

Abstract

This paper reports on the results of an investigation into the feasibility of a fibre Bragg grating stress cell for use in a geotechnical environment. To increase the transverse sensitivity of the sensor, we encapsulated it in silicon rubber. Tests were performed in two types of singular grained compacted silica sands. The data obtained with the calibrated stress cell agreed well with the Boussinesq stress, and it is shows a fair degree of repeatability.

An optical-fibre refractometric liquid-level sensor for liquid nitrogen

“…The advantages of optical-fibre sensors, as compared to traditional sensors, are very pronounced under some extreme environmental conditions. Traditional sensors will not withstand conditions such as very high temperatures, very low temperatures, high pressure, harsh ionizing radiation environment, etc [1][2][3][4][5]. Equipment which operates under such extreme environmental conditions often requires that certain parameters are monitored [6][7][8].…”