Reversible optical waveguide sensor for ammonia vapors.
A small glass capillary tube was fitted with a light-emitting diode and a phototransistor detector to form a multiple-reflecting optical waveguide device. When the capillary was coated with a thin solid film composed of an oxazine perchlorate dye, the device was demonstrated to be capable of reversibly sensing ammonia vapors. Ammoniavapor concentrations from 1000 parts in 10(6) (ppm) to less than 60 ppm were easily and reproducibly detected. A preliminary qualitative kinetic model is proposed to describe the vapor-film interaction.
Giuliani
J F
JF
Wohltjen
H
H
Jarvis
N L
NL