Alphasense Limited

Cranfield University

Elizabeth Jane Hodgkinson

John R Saffell

Ralph Peter Tatam

Thomas Kissinger

Richard Smith

John Davenport

James Andrew Bremner

John Robert Saffell

Abdullah Shah Asmari

Daniel Francis

John Robert Saffel

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

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.

Gas analyser

An optical absorption gas sensor comprising a body having an internal wall which defines a chamber, at least one aperture in the body through which a gas sample can enter the chamber, a light source, at least one reflector, a detector assembly which extends into the chamber and has a first side and an opposite second side, a detector which measures light which is incident at least a range of angles on at least a part of a first surface of the detector assembly on the first side of the detector assembly, wherein the light source is located within the chamber on the second side of the detector assembly, the whole being configured such that light from the light source passes through the gas sample and is reflected around the detector assembly, by the at least one reflector, onto the detector.

Optical absorption gas sensor

Growing community of inventors

Cranfield, United Kingdom

Elizabeth Jane Hodgkinson