By Dr. Craig A. Rogers (auth.), Prof. Dr.-Ing. habil. H. Janocha (eds.)
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Extra resources for Adaptronics and Smart Structures: Basics, Materials, Design, and Applications
When used extrinsically, the optical fiber does not act as a sensor but merely transmitslight. An example of an extrinsic fiber optic sensor is a position sensor, which uses the fiber to collect light from a source. Breaks in the light beam are used to accurately determine the position of a workpiece in robotics applications. Intrinsicsensing relies on changes in the light transmission characteristicsof the optical fiber. The use of optical fibers to perform intrinsic sensing in smart structureswas first investigated in 1979 at NASA Langley Research Center.
Other applications include tunable dampers, vibration isolation systems, clutches, brakes and other frictional devices (see Sects. 6). 2 Artificial Nerves- Sensors One of the critical functions instilled in adaptronicsystems and structures is sensing. Some of the sensing materialsused for this purpose include optical fibers, piezoelectric materials, and 'tagging'particles. Optical fibers can be used either extrinsically or intrinsically in sensing (see Sect. 2). When used extrinsically, the optical fiber does not act as a sensor but merely transmitslight.
Lead zirconate titanate (PZT)  and other piezoelectric materials are useful when high-precision or high- speed actuation is necessary. 3 What are They Made of? 21 optical trackingdevices, magnetic heads, adaptive optical systems, micropositioners for robots, ink~jet printers, and hifi speakers. Recent research has focused on using PZT actuators with sophisticated control systems in adaptronic structures to perform active acoustic attenuation, active structural damping, and active damage control.
Adaptronics and Smart Structures: Basics, Materials, Design, and Applications by Dr. Craig A. Rogers (auth.), Prof. Dr.-Ing. habil. H. Janocha (eds.)