Smart-sensor approach for a fibre-optic-based residual chlorine monitor

A Survey on Pollution Monitoring Using Sensor Networks in Environment Protection

“…For air pollution monitoring, sensors detecting CO 2 [4], CO [5], NO x (x = 1, 2) [6], SO x (x = 1, 2) [7], H 2 S [8], NH 3 [9], Cl 2 [10], O 3 [11] and particulate matter are frequently used. For water pollution monitoring, sensors monitoring heavy metal [12], pH value [13], conductivity [14], dissolved oxygen (DO) [15], turbidity [16], the content of carbon [17], chlorine [18], the content of phosphorus [19,20], and the content of nitrogen [21] are used. Some contaminants can be detected directly by sensors, especially in air environment, such as CO x , NO x , and SO x , but some sensors can only detect a type of pollutants and cannot measure the content of a specific contaminant.…”

Fiber-Optic Biosensors—Trends and Advances

“…In summary, the system is simple and robust, feasible, and economic in comparison to laboratorybased methods. 54 The Lawrence Livermore National Laboratory (LLNL) with cooperation from the University of California is in the process of developing a fiber-optic sensor for the detection of carbon tetrachloroethylen (TCE) and carbon tetrachloride (CCl4). The device incorporates fused-quartz optical fibers as a waveguide to conduct light to and from a remotely located sensor.…”

“…3 An optical-fiber based sensor, comprising of a deuterium lamp (DL), a lens system (LS), input and output fibers (FI,FO), an absorption cell (CE), and a fiber-optic spectrometer (FOS) (adopted from Belz, et al). 54 Fig . 4 HaloSnif fiber-optic sensor: 1, signal processing module; 2, fused silica optic fiber; 3, quartz plasma chamber; 4, tunable radio frequency power supply; 5, fiber-optic cable (adopted from CMST-CP).…”

Development of a photometric system for continuous flow analysis

“…While modern research and service-oriented laboratories of industrialized nations increasingly use sophisticated instruments, there is a growing need for compact, inexpensive and portable instruments that can perform determinations in regions far from the convenience of a modern laboratory [1]. Recent advances in low-cost, miniaturized detection technology [2][3][4] have made it possible to take traditional laboratory-based instrumental techniques, e.g. a UV/ visible spectrophotometer, to remote sites for in-situ monitoring.…”