Fiber-optic spectrochemical emissions sensor: a detector for volatile chlorinated compounds

✍ Scribed by Norman C. Anheier; Khris B. Olsen; Jeffrey W. Griffin

• Book ID: 103960790
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 422 KB
• Volume: 11
• Category: Article
• ISSN: 0925-4005
• DOI: 10.1016/0925-4005(93)85286-j

✦ Synopsis

Gl-ifill

We present a fiber-optic sensor developed to measure volatile chlorine-containing compounds in the gas phase. This unique sensor, called the HaloSniFM, is based on the atomic emission of chlorine. The Halo&if sensor uses a critical orifice air inlet (a 50 um capillary tube) and a radio frequency (r.E) excited helium plasma to excite the ambient air sample. A fiber-optic cable transmits the chlorine emission intensity to a signal-processing module, where it is optically filtered and amplified The HaloSnif system consists of a miniaturized probe (N 10 cm x 4 cm), fiber-optic cable, r.f. power supply, and a flow-control and signal-processing module. The compact robust system has been successfully field-tested at several waste-remediation sites. The detection limit for trichloroethylene in air is 1 ppm, with over four orders of linear response. Furthermore, Halo&if is capable of measuring concentrations of any gas-phase chlorine-containing compound.