Showing papers on "Inductive sensor published in 1973"
Patent•
12 Oct 1973
TL;DR: The method and apparatus of this invention examine properties of coins by subjecting them to electromagnetic fields of at least two substantially different frequencies as mentioned in this paper, and an indication that a coin is acceptable is produced only after the coin has satisfied the examination requirements at at least 2.
Abstract: The method and apparatus of this invention examine properties of coins by subjecting them to electromagnetic fields of at least two substantially different frequencies. An indication that a coin is acceptable is produced only after the coin has satisfied the examination requirements at at least two substantially different frequencies.
53 citations
Patent•
12 Oct 1973
TL;DR: In this article, the acceptability of a coin is dependent upon a function of an examination of the output of an inductor in the absence of coins and an examination in the presence of the coin.
Abstract: A method and apparatus for use in an inductive sensor coin selector in which the acceptability of a coin is dependent upon a function of an examination of the output of an inductor in the absence of coins and an examination of the output of the inductor in the presence of the coin.
29 citations
Patent•
25 Sep 1973TL;DR: In this paper, a proximity sensor for use as a position transducer or a strobe for metal parts is presented, which utilizes the change in the equivalent parallel resistance of an oscillator circuit as the metal part is relatively moved toward and away from the oscillatory circuit.
Abstract: A proximity sensor for use e.g., as a position transducer or a strobe, for metal parts. The sensor utilizes the change in the equivalent parallel resistance of an oscillator circuit as the metal part is relatively moved toward and away from the oscillatory circuit. Ready adjustment of the sensitivity of the sensor is provided by the use of adjustable resistors connected to the oscillatory circuit.
6 citations
Patent•
14 May 1973
TL;DR: An electronic comparator having two coils, each formed to receive one of two workpieces to be compared and connected through circuitry to the horizontal and vertical sweeps of a cathode ray oscilloscope is described in this article.
Abstract: An electronic comparator having two coils, each formed to receive one of two workpieces to be compared and connected through circuitry to the horizontal and vertical sweeps of a cathode ray oscilloscope.
3 citations