Paper tape analyser for gases based on optical fibres

Abstract

A paper tape analyser based on optical fibres is described and its performance is demonstrated through a real-time remote measurement of hydrogen sulphide by means of a paper strip impregnated with lead acetate. The device is capable of responding to H₂S levels of down to 50 p.p.b. (V/V) within 10 s with good reproducibility (1% relative standard deviation). The advantages imparted by optical fibres are discussed and possible improvements for a continuous multi-site and multi-gas analysis are presented.