Microwave signals are injected at one end of a slotted waveguide containing a shorting stub which is moved along the length of the waveguide. The distance to the shorting stub is determined from the comparative phase characteristics of the injected signals reflected back from the shorting stub.

A position sensor comprising a ferromagnetic member operatively connected to an operation means and movable in response to displacement of the operation means, a magnetically soft member surrounded by an electrical coil secured adjacent to a range of movement of the ferromagnetic member, and a displacement pulse phase conversion unit including a permanent magnet. Voltage pulses are applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage...

A position sensor for detecting a displacement of an object, comprising a movable member coupled to the object, a permanent magnet connected to the movable member, and a magnetically soft member surrounded by an electrical coil secured adjacent to a range of movement of the magnet. Voltage pulses are applied to one end of the electrical coil, the other end of which is connected in series with the resistor. For each pulse applied to the coil, a voltage drop across the resistor is detected and a t...

A circuit for sensing the position of a movable element such as a galvanometer pointer, recording stylus or the like includes a distributed electrical impedance to which the movable element is capacitively coupled. An oscillating signal is coupled across a gap between the movable element and the impedance, and is detected by rectification in order to provide an output signal indicating the position of the movable element. The oscillating signal is chosen so that the output signal can be utilized...

A position indicator system for remote indication of a position of a governing member. The indicator system has two bourdon tubes, the first of which is mechanically connected to the governing member and the second serves as an indicator actuator. The two bourdon tubes are interconnected with a capillary tubing in a closed hydraulic system and transmits the pressure variations generated by the mechanical subjection of the first bourdon tube by the governing member to the bourdon tube in the indi...

A position indicator includes a display panel which receives one end of each of a plurality of optical cables, the one ends of the optical cables being disposed to form a composite pattern such that predetermined sets of the one ends define required legends. The other ends of the optical cables terminate in a receiving station and the indicator further includes a light source capable of illuminating the other ends of the optical cables and a mask mounted for sliding movement between the light so...

This disclosure relates to an automatic position plotter having particular utility for marine vessel navigation applications and which will give a visual plot in relation to a navigational chart during movement of the vessel. The plotter includes a rotatable platform carrying according to one embodiment of the invention a chart image projector and two reticle position projectors with the platform and the reticle projectors controlled by radio directional control apparatus that automatically main...

An optical gauging apparatus includes structure defining a pair of light beams. One of the beams comprises a reference beam while the other is a measuring beam. An object to be gauged is positioned to partially interrupt the measuring beam. The partially interrupted measuring beam is compared with the reference beam as the object to be gauged is run through the gauging process.

A graphical input device for computer aided displays is described in which the area of interest is divided by the conductors of two orthogonal sets of coils. Each region of the of interest area is within a coil or combination of coils in each set unique to that region, so that when a change of the magnetic flux associated with a stylus indicating a point of interest occurs, currents induced in the coils represent the position of the point.

A position reader having a display device and a tablet, and being provided with means for detecting an end of display period of the display screen to set a position read period for reading the position of a pen-down point on the tablet, means for masking (i.e., fixing) display drive signals of the display device, and means for directing the CPU to read a coordinate position of the pen-down point on the tablet; the pen-down point read period being provided outside the display period of the displa...