how to create barcode in vb.net 2008 FIGURE 7.47 Image transmission through an image ber. in Software

Drawer Code 128A in Software FIGURE 7.47 Image transmission through an image ber.

FIGURE 7.47 Image transmission through an image ber.
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Industrial Sensors and Control
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Light source Flexible tube Image fiber Light guide Eyepiece Objective lens
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FIGURE 7.48 Basic structure of a ber scope.
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Many examples have been reported of the application of image fibers in process control. Image fibers are widely employed to observe the interior of blast furnaces and the burner flames of boilers, thereby facilitating supervisory control. Image fibers can operate at temperatures up to 1000 C, when provided with a cooling attachment for the objective lens and its associated equipment. Another important application of the image fiber bundles is observation, control, and inspection of nuclear power plants and their facilities. Conventional image fibers cannot be used within an ionizing radiation environment because ordinary glass becomes colored when exposed to radiation, causing increasing light transmission loss. A high-purity silica core fiber is wellknown as a radiation-resistant fiber for nuclear applications. The endoscope has demonstrated its vital importance in medical and biochemical fields such as: Angioplasty Laser surgery Gastroscopy Cystoscopy Bronchoscopy Cardioscopy
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In fiber-optic sensor networks, the common technological base with communication is exploited by combining the signal generating ability of sensors and the signal transmitting capability of fiber optics. This combination needs to be realized by a suitable network topology in various manufacturing implementations. The basic topologies for sensor networking are illustrated in Fig. 7.49. The basic network topologies are classified into six categories: Linear array network with access-coupled reflective sensors (Fig. 7.49a). Ring network with in-line transmissive sensors (Fig. 7.49b ).
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S D C C (a) C C
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FIGURE 7.49 Basic network topologies: (a) linear array, (b) ring, (c) re ective star, (d) re ective tree, (e) transmissive star, and (f) ladder network.
Industrial Sensors and Control
Star network with reflective sensors (Fig. 7.49c). Star network with reflective sensors; one or more sensors can be replaced by a separate star network, in order to obtain a tree network (Fig. 7.49d). Star network that can also be operated with transmissive sensors (Fig. 7.49e). Ladder network with two star couplers. A star coupler is replaced by several access couplers, the number required being equal to the number of sensors (Fig. 7.49f). Topological modifications, especially of sensor arrays and ladder networks, may be desirable in order to incorporate reference paths of transmissive (dummy sensors) or reflective sensors (splices, open fiber end). The transmit and return fibers, or fiber highway, generally share a common single-fiber path in networks using reflective sensors. When a suitable fiber-optic network topology is required, various criteria must be considered: The sensor type, encoding principle, and topology to be used The proposed multiplexing scheme, required number of sensors, and power budget The allowable cross-communication level The system cost and complexity constraints The reliability (i.e., the effect of component failure on system performance)
Power Line Fault-Detection Systems for Power Generation and Distribution Industries
In power distribution lines, faults such as short circuits, ground faults, and lightning strikes on the conductors must be detected in a very short time to prevent damage to equipment and power failure, and to enable quick repair. If the transmission line is divided in sections and a current or magnetic-field sensor is mounted in each section, a faulty section can be determined by detection of a change of the level and phase of the current on the power line. A system was developed as a hybrid optical approach to a fault-locating system that detects the phase and current difference between two current transformers on a composite fiber-optic ground wire (OPGW) wherein, due to induction, current is constantly passing (Fig. 7.50). The signal from a local electrical sensor, powered by solar cells and batteries, is transmitted over a conventional optical-fiber communication link. By three-wavelength
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FIGURE 7.50 Fault locating system based on current and phase in ground wire.
multiplexing, three sensor signals can be transmitted over a single fiber. Seven sensors, three at each side of a substation and one at the substation itself, can monitor one substation on the power line, using one fiber in the OPGW. Another system uses current transformers to pick up lightning current and thus detect lightning strikes. The signal is transmitted to a central detection point using the OPGW. Every sensor has its own OPGW fiber. This system is on a 273-kV power line in Japan. The OPGW opens the possibility for using all kinds of sensors along the transmission line. These sensors may not only be used for locating faults, but also for monitoring structural integrity. The use of optical time-domain reflectometry (OTDR) combined with passive intrinsic (distributed) sensors along the OPGW has future potential for providing a convenient and powerful monitoring method for power lines.
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