How it Works - Dc LVDT
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How it Works - Dc LVDT
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.
On our position measurement LVDTs, the two transducer secondaries are connected in opposition.
At the centre of the position measurement stroke, the two secondary voltages of the displacement transducer are equal but because they are connected in opposition the resulting output from the sensor is zero.
As the LVDTs armature moves away from centre, the result is an increase in one of the position sensor secondaries and a decrease in the other. This results in an output from the measurement sensor.
With LVDTs, the phase of the output (compared with the excitation phase) enables the electronics to know which half of the coil the armature is in.
The strength of the LVDT sensor's principle is that there is no electrical contact across the transducer position sensing element which for the user of the sensor means clean data, infinite resolution and a very long life.
An oscillator/demodulator circuit built into the displacement transducer supplies the excitation and converts the return signal to a dc voltage.
As the transducer contains internal signal conditioning electronics, there is no need for external signal conditioning.
RDP is a designer and manufacturer and distributor of LVDT displacement transducers, amplifiers, load cells and pressure sensors for use in a wide range of applications. We are privately owned by the two directors who started the company in 1966. Our extensive range LVDT displacement sensors and amplifiers are manufactured by us at our UK head office and factory. RDP was one of the first manufacturers of LVDT displacement transducers and the first to build the LVDT signal conditioning amplifier into the sensor.
With over 50 years of experience designing and manufacturing LVDTs and other types of linear position transducers we can normally offer a solution from our vast knowledge base to meet your application requirements.
- General Purpose Industrial Models
- Washdown and Sealed/Submersible Models
- Units for Extreme Environments
Call us at 1-800-334-5838 to discuss your special needs with one of our application engineers and we will design a custom solution.