how to generate barcode in vb.net 2010 Advanced Sensors in Precision Manufacturing in Software

Generation Code 128 in Software Advanced Sensors in Precision Manufacturing

Advanced Sensors in Precision Manufacturing
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follows: three of nine bars (light and dark) form wide characters; the rest are narrow. Bar-code labels are simple to produce. Code 39, for example, can be generated by a personal computer. Such labels are ideal for inventory identifications and other types of fixed-information gathering. Bar codes are not necessarily placed on labels. Tools, for example, have had the code etched on their surfaces to allow for tool tracking. Techniques have been developed for molding bar codes onto rubber tires. Holographic scanners allow reading around corners so that parts need not be oriented perpendicular to the reader as they feed down a processing line. A difficulty with bar coding has been the fact that it cannot be read if the bars become obscured by dirt, grease, or other substances. Infrared scanners are used to read codes coated with black substances to prevent secrecy violations through reproduction of the codes. One way to generally offset the problem of a dirty environment is to use magnetic-stripe-encoded information.
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6.1.2 Transponders
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While bar-code labels and magnetic stripes are very effective on the shop floor, shop circumstances may require more information to be gathered about a product than can be realistically handled with encoded media. For instance, with automobiles being assembled to order in many plants, significant amounts of information are necessary to indicate the options for a particular assembly. Radio-frequency (RF) devices are used in many cases. An RF device, often called a transponder, is fixed to the chassis of a car during assembly. It contains a chip that can store a great amount of information. A radio signal at specific assembly stations causes the transponder to emit information that can be understood by a local receiver. The transponder can be coated with grease and still function. Its potential in any assembly operation is readily apparent. Several advanced transponders have read/write capability, thus supporting local decision making.
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Many other possible electronic schemes can be employed to identify manufactured parts in motion. Information can be coded on a magnetic stripe in much the same way that bars represent information on a bar-code label, since the light and dark bars are just a form of binary coding. Operator identification data are often coded on magnetic stripes that are imprinted on the operators badges. Magnetic stripe information can be fed into a computer. Such information might include the following: (1) the task is complete, (2) x number of units have been produced, (3) the unit part numbers, (4) the operator s identification
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number, and so on. This same scanning station can also be set up using bar-code information; however, with magnetic striping, the information can be read even if the stripe becomes coated with dirt or grease. A disadvantage of magnetic striping is that the reader has to contact the stripe in order to recall the information.
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6.1.4 Surface Acoustic Waves
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A process similar to RF identification is surface acoustic waves (SAW). With this process, part identification is triggered by a radar-type signal that can be transmitted over greater distances than in RF systems.
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Optical Character Recognition
Another form of automatic identification is optical character recognition (OCR). Alphanumeric characters form the information, which the OCR reader can read. In mail processing centers, high-speed sorting by the U.S. Postal Service is accomplished using OCR. The potential application to manufacturing information determination is obvious. Other means of part identification abound, such as vision systems and voice recognition systems. Vision systems utilize TV cameras to read alphanumeric data and transmit the information to a digital converter. OCR data can be read with such devices, as can conventionally typed characters. Voice recognition systems have potential where an individual s arms and hands are utilized in some function that is not conducive to reporting information. Such an application might be the inspection of parts by an operator who has to make physical measurements on the same parts. In laser scanning applications, a laser beam scans and identifies objects at a constant speed. The object being scanned interrupts the beam for a time proportional to its diameter or thickness. Resolutions of less than 1 mm are possible. In linear array applications, parallel light beams are emitted from one side of the object to be measured to a photooptical diode array on the opposite side. Diameters are measured by the number of array elements that are blocked. Resolutions of 5 mm or greater are possible. In TV camera applications, a TV camera is used in the digitizing of the image of an object and the result is compared to the stored image. Dimensions can be measured, part orientation can be determined, and feature presence can be checked. Some exploratory work is being accomplished with cameras that can fit in a tool changer mechanism. The camera can be brought to the part like a tool and verify part characteristics.
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