Linear Position Sensors, All Types Specifications

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	Capacitance		Capacitance-based instrumentation is designed primarily to take noncontact measurements of position, displacement, vibration, and run out or thickness measurements. These sensors can be used on conductive and nonconductive target materials, but can be sensitive to environmental parameters that change the dielectric constant of the medium between the sensor and the target (usually air).
	Eddy Current		These noncontact linear position sensors usually contain two coils, one active coil that is influenced by the presence of a conducting target, and a second coil that completes a bridge circuit and provides temperature compensation. As the target comes closer to the probe, the eddy currents become stronger, which changes the impedance of the active coil and causes a bridge unbalance related to the target position.
	Fiber Optic		A fiber optic element is a flexible strand of glass or plastic capable of transmitting light along its length by maintaining near total internal reflection of the light being accepted at its input end. A fiber optic displacement transducer uses an adjacent pair of fiber optic elements, one to carry light from a remote source to an object or target whose displacement or motion is to be measured, and the other to receive the light reflected from the object and carry it back to a remote photo sensitive detector.
	Inductive		Inductive position sensors are noncontact devices that determine an object's coordinates (linear or angular) with respect to a reference. Displacement is measured when the object moves from one position to another at a specified distance (or angle). In other words, a position sensor is a linear device whose output signal represents the distance an object is from a reference point.
	Linear Encoder		Linear encoders sense and digitize linear position change for position measurement and feedback to control systems. Encoder technologies include optical encoders used in linear glass scales, magnetostrictive sensors, and conversion of linear motion, to rotary motion via a rack and pinion, to rotary encoders of various types.
	Linear Potentiometer		A linear potentiometer is a sensor that produces a resistance output proportional to the displacement or position. The resistance element is excited by either DC or AC voltage, and the output voltage is ideally a linear function of the input displacement.
	LVDT		A linear variable differential transformer, or LVDT, is a series of inductors in a hollow cylindrical shaft and a solid cylindrical core. The LVDT produces an electrical output proportional to the position of the core. The LVDT may be used in many different types of measuring devices that need to convert changes in physical position to an electrical output. The lack of friction between the hollow shaft and the core prolong the life of the LVDT and enable very good resolution. In addition, the small mass of the core allows for good sensitivity in dynamic tests.
	Magnetoresistive		A position sensor determines an object's coordinates (linear or angular) with respect to a reference, displacement means moving from one position to another for a specified distance (or angle). In other words, a position sensor is "a linear device whose output signal represents the distance an object is from a reference point." For magneto resistive sensors, the resistance of a conducting strip is a function of the direction and magnitude of an applied magnetic field; these include Hall Effect sensors.
	Magnetostrictive		Displacement or strain is deduced from the change in state of the magnetic field generated by a ferromagnetic material. This can often take the form of a magnetostrictive sensor passing over a magnetic tape with magnetic elements placed precisely and evenly along the length.
	Optical Time of Flight		Time of flight sensors and instruments determine displacement and distance by measuring the time it takes light to travel from the instrument to a target and back. Some methods analyze a single trip while others calculate the measured range over a number of trips.
	Optical Triangulation		Optical triangulation sensors use reflected waves, whose source may be a LED, infrared, or laser source to pinpoint position and displacement. A sensor, usually integrally housed with the emitter, detects the beam reflected off the surface or object and provides an output that varies with the distance. Optical triangulation equipment will typically have a reference distance or standoff. This is the measurement distance; the working range provides measurement for distances either more or less the reference distance.
	Photoelectric		Photoelectric sensors use beams of light reflected off the target to measure distance or displacement. Reflective properties of the target and environment are important considerations in the choice and use of photoelectric sensors.
	Ultrasonic		An acoustical signal reflects off the target. The distance between the sensor and the target is calculated from the signal's return time and the propagation velocity of the measurement medium.
	Variable Reluctance		Noncontact position sensors utilizing variable reluctance based technology. A position sensor is a linear device whose output signal represents the distance an object is from a reference point.
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