Passive sonar, on the other hand, is a means to detect ships that does not involve revealing the user’s location. It is for that reason the sonar method favored by submarines. Passive sonar simply involves listening, via sensitive hydrophones, for telltale signs of nearby ships. These signs...
Semi-active radar is a form of bistatic radar used in long-range missile systems. In a semi-active radar, the missile acts as a passive detector of a radar signal originating from an external source. Passive radar is a form of bistatic or multistatic radar that relies on non-radar transmit...
A computer attached to the scanner does the rest (so in a library, the self-checkout machine communicates with the library's computer to update the main database whenever you check out or return a book). Unlike RF tags, RFID tags tend to work over much shorter distances. Some actually ...
It is called a "passive" seeker because, unlike a radar-guided missile, it does not emit radio waves in order to "see" its target. It is a "fire-and-forget" weapon, meaning it requires no input from the gunner once it's fired. This allows them to take cover, move to another ...
RFID systems have three components that make them work: an antenna, a transceiver, and a transponder (tag). The part of the tag that encodes the data is called the RFID inlay. When you combine the antenna and the transceiver, you have an RFID reader, also known as an interrogator. ...
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But in the case of a speedometer, the eddy currents create a drag torque that does work on the speed cup. The cup and its attached needle turn in the same direction that the magnetic field is turning— but only as far as the hairspring will allow it. The needle on the speed cup ...
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