What is a linear encoder?

Linear encoders, or rulers, are actually position sensors. The sensor reads the scale and encodes the read position into an analog or digital signal. This signal can be decoded by a position controller. These encoders or rulers are available in two types: Absolute or Incremental. A change in position per unit time indicates movement. The technology of making rulers (linear encoders) includes optical, inductive, magnetic, capacitive and eddy current.

Technical specifications of linear encoder (ruler)
Application of linear encoders (rulers)

There are two main uses for linear encoders:
- Measurement
- Measurement applications include coordinate-measuring machines (CMMs), laser scanners, calipers, gear measurements, traction testers, and Digital Read Outs (DROs).
- CMMs are machines for measuring the physical and geometric properties of an object.
- (Digital Read Outs) DROs: A display with a keypad with an internal computer, which reads the signals generated by linear encoders or rotary encoders.

Motion Systems

Servo control motion systems use linear encoders to produce fast, high-precision motion. Applications of rulers in propulsion systems include robotics, machine tools, pick-and-place PCB assembly equipment, semiconductor testing equipment, wire-bonding machines, printers, and digital presses.