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Inductive working principle

Going back to the basis of the principle of action, it can be stated as follows:

A metallic core is moved in the vicinity of a coil through which alternating currents flow, thereby causing a change in the impedance and the alternating current resistance of the coil within this coil. This change can be measured and amplified with skillful wiring (see Wheatstone Bridge Circuit). Thus, a change in displacement can be represented in an electrical signal.

There are different approaches to the technical implementation. Most displacement transducers at HBK are designed as active quarter bridges or half bridges, which, then, are internally supplemented to form half or full bridges. Strictly speaking, this means that only one or two parts of the bridge circuit are coils, while the other parts are represented by resistors.

In order to optimize linearity and temperature behavior, special methods are employed to wind the coil and create the magnetic core.

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