The University of Southampton
University of Southampton Institutional Repository

A novel gas concentration monitor using a solid state modulator

Fairley, P.D. and Rutt, H.N. (2001) A novel gas concentration monitor using a solid state modulator Sensors and Actuators B: Chemical, 75, (3), pp. 192-196. (doi:10.1016/S0925-4005(01)00760-2).

Record type: Article


In this paper, we demonstrate the application of a novel solid state modulator in monitoring the concentration of a test gas. A widespread cost-effective method of gas concentration monitoring currently uses a blackbody source and pyroelectric detector combined with a filter to isolate the required infrared spectral region. Presently the intensity on the detector is modulated by either a mechanical chopper or by electrically-pulsing the source. The device described by this work uses a continuously-driven blackbody source with a novel solid state infrared modulator operating in the 8-14 µm band to generate the required change in intensity on the pyroelectric detector, eliminating the need for moving parts. The modulator may be incorporated into the detector’s optical window in a more-compact future device. The modulator operation is outlined, and the results of determining the concentration of SF6 test gas in a dedicated cell are compared for the solid state modulator and a mechanical chopper.

Full text not available from this repository.

More information

Published date: 15 May 2001
Keywords: germanium, infrared, solid state, modulator, chopper, gas sensing, SF6


Local EPrints ID: 13667
ISSN: 0925-4005
PURE UUID: 01018fc2-5cb1-4049-bd70-9f309cce1481

Catalogue record

Date deposited: 12 Jan 2005
Last modified: 17 Jul 2017 17:01

Export record



Author: P.D. Fairley
Author: H.N. Rutt

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.