|Ammonia at elevated concentrations is poisonous to different organisms. For examples, 22.8 ppm can be lethal to water organisms and exposure to ammonia as low as 35 ppm for over 15 minutes can be dangerous to humans. Therefore, a continuous, online ammonia monitoring system is highly desired, especially for dynamic aqueous water delivery systems. Various electrochemical, catalytic, and optical fiber sensors have attracted substantial attention for the monitoring of ammonia in gaseous phase given they provide an easy and fast means of continuous detection. The majority of the fiber optic ammonia sensor research efforts have been focused on the employment of Glass Optical Fiber (GOF) sensors, which primarily focuses on the detection of ammonia in the gaseous phase such as in air.
Researchers at Purdue University have developed a novel technique for the fabrication of Plastic Optical Fiber (POF) sensors that are ideal for monitoring water delivery systems. POF sensors are more flexible and stronger mechanically than GOF sensors, and POF sensors are a more suitable choice for applications that require the use of long optical fibers, such as monitoring ammonia in the artificial water delivery systems. This fabrication technique is inexpensive, reliable, sensitive, and reversible.
-Compact, lightweight, and relatively inexpensive
-Immune to electromagnetic interference
-Ammonia monitoring in artificial water delivery systems
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