Cranfield University

Alphasense Limited

Ralph Peter Tatam

Thomas Kissinger

Elizabeth Jane Hodgkinson

John R Saffell

John Davenport

James Andrew Bremner

John Robert Saffel

Abdullah Shah Asmari

Daniel Francis

An interferometric fluid sensing system includes: a laser; a plurality of first fibre portions arranged to receive laser light from the laser; a second fibre portion configured to provide a reference arm for the interferometric fluid sensing system; and a detector arranged to receive light from the first and second fibre portions, wherein the laser light that passes through a void of each first fibre portion is caused to interfere with light passing through the second fibre portion at or before reaching the detector, wherein each of the first fibre portions is arranged such that that light passing through the void of each first fibre portion travels from the laser to the detector over a different path length from the light passing through the voids of the other first fibre portions.

Fluid sensing systems and methods

An optical shape sensing method is provided. The method comprises: providing first and second optical fibre portions arranged to receive light from at least one common lasers such that a path length of the light from the laser to the first optical fibre portion differs from a path length of the light from the lasers to the second optical fibre portion by a first distance; wherein the first and second optical fibre portions are spaced apart from each other in a first direction; and wherein the first and second optical fibre portions comprise a plurality of reflectors spaced along the length of the optical fibre portions, wherein the reflectors are arranged in sets of reflectors, each set including one reflector from each of the optical fibre portions, wherein the reflectors in each set are aligned with one another in a second direction that is perpendicular to the first direction when the optical fibre portions are in neutral positions; supplying light from the laser to the optical fibre portions; detecting an interferometric signal from the optical fibre portions at a common detector; determining, for each set of reflectors, optical path length differences between the reflectors in the set of reflectors based on the detected interferometric signal; determining a curvature of the optical fibre portions in the first direction based on the optical path length differences, between the reflectors in the first and second optical fibre portions, for the sets of reflectors. An optical shape sensor and optical shape sensing system are also provided.

Optical shape sensing method and system

A fibre optic sensing device is provided. The fibre optic sensing device includes a plurality of optical fibre portions, wherein each optical fibre portion is arranged to receive laser light from a common laser and reflect the laser light to a common detector. Each optical fibre portion includes a first reflector spaced from a distal end of the optical fibre portion and a second reflector at the distal end. Each optical fibre portion also includes a sensor provided at the distal end of the optical fibre portion. The sensor includes a third reflector the position of which varies depending on a value of a property being sensed. A distance between the first and second reflectors is different for each of the optical fibre portions.

Fibre optic sensing device

A gas analyzer and a corresponding method is provided to measure the concentration of formaldehyde within enclosed environments such as within buildings comprising an ultraviolet light source, a sample chamber, a detector. The detector measures the intensity of light received by photosensors within a measurement range of wavelengths, and at least one reference range of wavelengths. Advantageously, the concentration of formaldehyde is determined taking into account fluctuations in the intensity of light emitted by the light source, and in the presence of any interferents such as nitrogen dioxide.

Growing community of inventors

Cranfield, United Kingdom

Ralph Peter Tatam