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From Dataforth Corporation
Linear variable displacement transducers (LVDTs) provide a method of measuring displacements with very high accuracy and infinite resolution. These type of transducers utilize a precision linear variable differential transformer (also referred to in the industry as LVDT) as a measuring source together with hybrid ICs which include an oscillator, demodulator and filter. This combination provides a self-contained unit that accepts a dc voltage input and provides a dc voltage output relative to armature position. Until recently, LVDTs were powered from an AC voltage source. One of the major difficulties was providing a stable and accurate AC source and converting the AC output signal back to DC for input to data acquisition systems. This required expensive and bulky external AC excitation power, demodulators and amplification equipment. Development of practical DC powered LVDTs became possible when miniature, high performance, solidstate components became available. Products & Services
Linear variable differential transformer (LVDT) linear position sensors have a series of inductors in a hollow cylindrical shaft and a solid cylindrical core. These devices produce an electrical output proportional to the position of the core
Linear variable differential transformer (LVDT) and rotary variable differential transformer (RVDT) signal conditioners are devices that translate the linear or rotary movement of a ferromagnetic armature into an AC voltage that is proportional to the armature position.
Bridge conditioners are instruments that provide excitation and support for strain gages, Wheatstone bridges, load cells, and sensors. They also include circuitry for signal conditioning, amplification, and processing.
Position probes measure the position of a target surface, usually with a high degree of accuracy. This search form covers many different linear position products.
Data acquisition input modules accept sensor and other signal output for data acquisition systems. They may include signal conditioning prior to the analog-to-digital conversion stage.
Product Announcements
Topics of Interest
Variation of ambient temperature, if great enough, may affect Linear Variable Differential Transformer (LVDT) characteristics. The output signal from the LVDT can be affected, in various degrees, by...
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AC and DC motors are the two major types in use today that are related to the industrial and HVAC applications. These motors provide the speed, torque, and horsepower necessary to operate the...
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The transfer of current between the primary and the secondaries of the LVDT displacement transducer is controlled by the position of a magnetic core called an armature.
At the centre of the position...
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In most power electronic applications, the power input is in the form of a 50 Hz or 60 Hz sine-wave AC voltage provided by the electric utility, which is then converted to a DC voltage. Increasingly,...
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AC Contactor
Designed for the specific purpose of establish or interrupting an AC power circuit. A contactor is a high power, electromagnetic switch. It is constructed of a low voltage "control...
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Technical Articles
AN509 SCM5B43 - DC LVDT Input Module (.pdf)
- Data Acquisition and Signal Conditioning
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