Optical Characteristics of Fiberoptic Evanescent Wave Sensors

摘要: The availability of low-loss optical fibers with the associated benefits freedom from electromagnetic interference, small size, light weight, and wide bandwidth has led to development sensors, both intrinsic extrinsic. Commercial offerings extrinsic type, in which sensing element is attached end fiber, are becoming readily available for measurement many physical chemical parameters, e.g., temperature, pressure, pH. fiber itself functions as sensor, potentially offer more sensitivity versatility. In some cases, distance or location information may be obtained sensors by means optical-pulse techniques. usually complex their instrumentation environmental requirements, entry into commercial market proceeded slowly.