Position Determination Using Pulse Delays
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
This invention provides a means of accurately measuring distances in a very short period of time in order to know the velocity of the object and to implement variable character-per-inch densities. The distance to an object can be determined by measuring the time delay of a pulse from its transmission to the reception of the pulse. A transmitter may be provided which produces a magnetic field that is transmitted to a receiving coil. The receiving coil blocks the electric field by using a conductor over it. As the magnetic field passes through the coil, it produces an electrical pulse that propagates to a receiver. Since the coil of the receiver is a very large inductor, the received pulse propagates very slowly. Typical pulse delays are about ten microseconds. Referring to Fig.