ET342 · Measuring Displacement, Angle and Speed

Experimental Platform for Measuring Displacement, Angle and Rotational Speed

A course package on the sensors that measure linear displacement, angular position and rotational speed - LVDT and capacitive probes, optical encoders, Hall sensors and resolvers - driven by a controllable reference drive and evaluated by analog and digital methods.

Experiments

Analog and digital methods for measuring displacement, angle and speed
Design and calibration of inductive (LVDT) displacement sensors - characteristic curves
Capacitive displacement measurement with an AC measuring circuit
Optical encoders for shaft position - incremental, binary and Gray code
Position and speed measurement of rotating shafts with Hall sensors
Rotational speed determination by pulse counting
The resolver principle - amplifier calibration and recording of position characteristics
Comparison of sensor types for the same physical quantity; resolution, repeatability and linearity errors

Description

The platform covers the sensors and signal-processing circuits used to measure linear displacement, angular position and rotational speed - by both analog and digital methods. Four experiment cards are included. The centrepiece is a card with an integrated controllable drive that generates the reference motion, instrumented with three angle/speed sensors: a Hall sensor, a resolver and an optical encoder supporting incremental, binary and Gray code tracks. A second card provides a contactless inductive displacement sensor (LVDT) with its conditioning circuit; a third carries a capacitive displacement sensor with an AC measuring circuit; and a fourth implements the measurement amplifier for resolver experiments.

Courseware

The interactive multimedia course - at least 6 hours of directed instruction - guides the calibration of each sensor, the recording of its characteristics, encoder signal decoding including quadrature, position and speed computation, and the comparison of sensing principles for the same physical quantity, with evaluation of resolution, repeatability and linearity errors. Signals are acquired and plotted by the ET300 base system's virtual instruments, with accessible measuring points at each conditioning stage; exercises are self-assessed, with Romanian-language support.

Scope of Delivery

Experiment card with controllable drive and Hall, resolver and optical sensors
Experiment card with inductive displacement sensor (LVDT)
Experiment card with capacitive displacement sensor (AC measuring circuit)
Experiment card with resolver measurement amplifier
Storage case
Course browser and course software
Connection cables and mechanical accessories

Specifications

Experiment cards 4 - drive with angle/speed sensors, LVDT, capacitive, resolver amplifier

Reference motion controllable drive integrated on the card

Angle / speed sensors Hall sensor, resolver, optical encoder

Optical encoder incremental, binary and Gray code tracks; several hundred pulses per revolution

Displacement sensors inductive LVDT (contactless) and capacitive with AC measuring circuit

Resolver position measurement with dedicated measurement amplifier card

Speed / decoding pulse counting per unit time; encoder decoding incl. quadrature in software

Course duration min. 6 hours of guided instruction, with self-assessment

Base system requires ET300 (interface + experimenter) - not included