how to create barcode in vb.net 2008 FIGURE 8.30 Cross-section of a linear variable displacement transducer sensor. in Software

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FIGURE 8.30 Cross-section of a linear variable displacement transducer sensor.
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FIGURE 8.31
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Plot of LVDT operational characteristics.
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When the primary coil is energized by an external AC source, voltages are induced in the two secondary coils. These are connected series-opposing so that the two voltages are of opposite polarity. Therefore, the net output of the sensor is the difference between these voltages, which is zero when the core is at the center or null position. When the core is moved from the null position, the induced voltage in the coil toward which the core is moved increases, while the induced voltage in the opposite coil decreases. This action induces a differential voltage output that varies linearly with core position. The phase of this output voltage changes abruptly by 180 as the core is moved from one side of the null to the other.
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With increasingly sophisticated technology, more and more instrumentation applications have arisen for sensors capable of operating in such hostile environments as extremely cold temperatures, very high temperatures, and/or intense nuclear radiation. The LVDT has been developed with materials that can tolerate extreme environmental
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requirements. Although the operating environments vary greatly, these LVDT designs use similar materials of construction and share the same physical configurations. Currently, these LVDT sensors are built entirely with inorganic materials. The coil form is made of dimensionally stable, fired ceramic wound with ceramic-insulated high-conductivity magnet wire specially formulated for the application. Joints between the windings and lead wires are brazed or welded for mechanical reliability and electrical continuity. Ceramic cements and fillers are chosen to optimize heat transfer and bonding between windings, coil form, and housing. The potted assembly is cured at elevated temperatures, fusing the components together into a solidified structure. Most inorganic insulations tend to be hygroscopic by nature, so the cured coil assembly is encased in an evacuated stainless steel shell that is hermetically sealed by electron beam (EB) welding. This evacuation and sealing process prevents moisture accumulation and subsequent loss of the insulation s dielectric strength. It also seals out surrounding media from the windings, while permitting the core to move freely. Electrical connections are made to the windings with nickel conductors mutually insulated from each other by magnesium oxide filler and sheathed in a length of stainless-steel tubing. This cable assembly can be terminated by a hermetically sealed header for a connector when the application requires it. The preceding description gives a brief insight into the material and techniques currently used in constructing the sensor for extremely severe environments. However, the state of the art in materials technology is being continually advanced. As new materials and methods of construction are evaluated, tested, and proved to upgrade performance, they will be incorporated into these sensors.
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An LVDT sensor connected to the gripper of a robot is designed to cover a wide range of cryogenic applications ranging from general scientific research to space vehicle analysis and cryogenic medicine. A significant feature of the LVDT sensor is its ability to withstand repeated temperature cycling from room ambient conditions to the liquefaction temperatures of atmospheric gases such as nitrogen and oxygen. In order to survive such rigorous temperature changes, the sensor is constructed of materials selected for compatible coefficients of expansion while maintaining good electrical and magnetic properties even at 450 F ( 270 C). The evacuated and hermetically sealed stainless-steel case prevents damage that could otherwise result from repeated condensation, freezing, and revaporization. Internal magnetic and electrostatic shielding renders the sensor insensitive to external magnetic and electrical influences.
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8.10.3 Measurement at High Temperatures in Manufacturing
The LVDT sensor has been developed for measurements involving very high temperatures. It is capable of operating continuously at 1100 F (600 C) and surviving temperatures as high as 1200 F (650 C) for several hours. Typical uses include position feedback from jet engine controls located close to exhaust gases and measurement of roller position and material thickness in hot strip or slabbing mills. In scientific research, it can be used to directly measure dimensional changes in heated test specimens without requiring thermal isolation, which could induce measurement errors. The sensor is the culmination of the development of sophisticated construction techniques coupled with careful selection of materials that can survive sustained operation at high temperatures. Because magnetic properties of a metal vanish above its magnetic transformation temperature (Curie point), the core material must be made from one of the few magnetic materials having Curie temperatures above 1100 F (600 C). Another problem is that, at high temperature, the resistance of windings made of common magnet wire materials increases so much that an LVDT sensor using ordinary conductor materials would become virtually useless. Thus, the winding uses a wire of specially formulated highconductivity alloy. The sensors are made with careful attention to internal mechanical configuration and with materials having compatible coefficients of expansion to minimize null shifts due to unequal expansion or unsymmetrical construction. Hermetic sealing allows the sensor to be subjected to hostile environments such as fluid pressure up to 2500 psi (175 bars) at 650 F (350 C). Units can be factory calibrated in a special autoclave that permits operation at high temperature while they are hydrostatically pressurized.
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