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RFID technologies are commonly used for logistics initiatives. However, having less universal frequency standards across all countries challenges globaNFC CARDimplementations.
In the internal process like copper refining the frequencies are restricted with an environment controlled by BHP Billiton. In this particular environment, combo cards was supposed to track and trace cathode performance effectively, provided that we've got the technology could survive harsh conditions.
CSC and BHP Billiton tested great and bad contactless cards within the company's Cerro Colorado tank house, inside a hostile environment that included acid mist in mid-air, water temperatures of 190 degrees Fahrenheit and short-circuiting.
Ahead of the study, damaged metal cathodes, combo cards employed in the refining tactic to extract copper, produced a reduced grade of copper. This is costly to BHP Billiton, the world's largest diversified resource company.
10 % with the copper created in BHP Billiton's Chile-based Cerro Colorado mine alone could be off-grade, causing decreased revenue and increased cost to rfid inlay manually separate contaminated copper. The plates were visually inspected, but there wasn't any method to identify and track individual plates because identifying technologies including bar codes couldn't withstand the acid corrosion.
BHP wished to explore whether RFID CARDtechnology, which utilizes tags and readers to follow people or objects via radio wave transmissions, could track the plates. In accordance with Dennis Franklin, account executive for CSC's Australian Resources Sector, "If RFID could be utilized to increase quality, BHP could demand more of an premium available."
RFID Cards,prelam,inlay,NXP Mifare,NFC
LF 125KHz, HF 13.56MHz, UHF 860-960MHz
Smart cards, RFID
A lot of companies use proximity cards to control physical access. A staff holds their rfid inlay within a few inches in the reader people receives a unique id from your card and transmits it to many central computer that tells it if you should open the threshold.
This can be rather magical, considering that the tag is credit card-thin and possesses no battery. The key comes to forsmart cards. The various readers constantly transmits a rather strong carrier the tag derives its power and clock out of this carrier, kind of like a crystal radio. The tag changes simply how much carrier it reflects back on the reader%u2014loosely, celebrate the circuit across its antenna similar to a quick or more as an open%u2014to transmit its code. The various readers and also the tag both have antenna coils tuned towards the carrier frequency they work just like a loosely-coupled resonant transformer.
Or otherwise that's the thought. I couldn't find any credible documentation for the protocol employed by the particular proximity cards which are accessible to me (Motorola's Flexpass). I did find a datasheet that claimed that they can dealt with a contactless cardsr. I wound a couple dozen turns of magnet wire over a 4" form, taped it into a reader, and 'scoped the coil. There was clearly indeed a 125 kHz sine wave, large, a couple of volts peak to peak. They did, a minimum of, work at 125 kHz.