By David A. Krohn, Trevor W. MacDougall, Alexis Mendez
This fourth version of Fiber Optic Sensors is revised and up-to-date to incorporate the hot sensing applied sciences rising in wide advertisement use, with a spotlight on scattering-based dispensed sensing platforms. additionally, a bankruptcy was once extra to explain biophotonic sensing structures and their purposes. This e-book covers a vast variety of aspect sensors and disbursed sensor applied sciences and their purposes in a multiplicity of markets together with strength, biomedical, shrewdpermanent buildings, safety, army, and approach keep watch over. It illustrates how this portfolio of applied sciences has addressed many sensing difficulties which are tricky for traditional ways and infrequently require survival in tremendous harsh stipulations. With the addition of 2 authors who deliver seventy five years of mixed adventure in fiber optic sensor expertise, this variation is an important replace and a very good source for any engineer who has an curiosity in complicated sensing platforms
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Extra info for Fiber optic sensors : fundamentals and applications
Sample text
13. One wavelength l1 is used for sensing; the light is transmitted to the target, passes through a bandpass filter, reflects from the target, is collected by the receiving fiber, and is detected. The light beam of wavelength l1 has been compensated for lightsource intensity. The transmitted beam is modulated by the target and microbending effects. The second wavelength l2 is reflected at the band-pass filter, collected by the receiving fiber, and detected. The light beam of wavelength l2 has been compensated for light source intensity, and the transmitted beam is a reference not being modulated by the target.
Ultrasophisticated sensors using interferometric techniques have been developed and are in wide use. Compared to conventional displacement sensors, these devices have four to five orders of magnitude higher resolution. 3 Classification of optical fiber sensors by transducing approach (Ref. 5). aspx 24 Chapter 2 sensitivities are not required for most applications except for military hydrophone and gyroscope use. Most industrial sensors fall somewhere between these extremes. 3,4 6 17 Intensity-modulated sensors generally are associated with displacement or some other physical perturbation that interacts with the fiber or a mechanical transducer attached to the fiber.
Hence, the fundamental principle is to measure an external physical parameter by inducing changes in one or more of the optical properties of a light beam traveling inside and along an optical fiber. The fiber is thus both the sensing element and transmission medium. Fiber optic sensors represent a technology base that can be applied to a multitude of sensing applications. 2 Light modulation effects used by fiber sensors to detect a physical parameter (reprinted from Ref. 4 with permission). • • • • • • • • • • Small size and lightweight Allow access into normally inaccessible areas Potentially easy to install Immune to radio frequency interference (RFI) and electromagnetic interference (EMI) Solid-state reliability High accuracy Can be interfaced with data communication systems Secure data transmission Resistant to ionizing radiation Can facilitate distributed sensing Most physical properties can be optically sensed with fibers.
