DIGITAL TRANSDUCER RESEARCH PROGRAM 5935-M.
Annual progress rept. no. 1,
NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA ENGINEERING DEVELOPMENT LAB
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Efforts concerned the development of a digital transducer. A method was conceived to transform transducer rectilinear motion into a parallel binary pulse code by magnetic reluctance techniques. This noncontact technique generates digital signals representing the mechanical displacement of a magnetic armature, by successively altering the state of a matrix of magnetically permeable wire rods. The rods of the matrix are inductively coupled to the armature by an alternating or pulsed magnetic field. Sense windings about the rods are cross-connected to provide the desired code. Gray or natural binary digital codes can be provided. Several psuedotransducer models were fabricated to demonstrate the feasibility of the magnetic technique. The first model provided an output of three binary digits for a rectilinear motion of three-quarters of an inch. The maximum output signal from this model was 0.5 millivolt. In later models, the three binary digits were provided for a rectilinear motion of one thirty-second of an inch, and the maximum output signal was increased to 20 millivolts. Basic investigations revealed that 1 The sense windings must be positioned as close as possible to the armature end of the rod 2 a binary one and a binary zero can be generated simultaneously on the same rod and 3 the armature signal is inductively coupled to the matrix through the magnetic rod and detected by the sense winding. Author