Magnescale BH20 Rotary Laserscale

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Compact High‑Accuracy Rotary Encoder for Precision Angle Measurement

The BH20 is a compact, high‑precision rotary Laserscale designed for applications requiring exceptional angular accuracy, resolution, and response speed.

Using advanced laser interferometric measurement technology, it delivers reliable, non-contact position feedback for precision motion control and high-performance measurement systems.

Key features

High angular resolution – Achieves extremely fine resolution down to sub‑nanoradian levels for precision positioning
High response speed – Supports measurement speeds up to 1,800 mm/s for dynamic applications
Compact design – Ultra‑thin 12 mm sensor head enables easy integration into space‑constrained systems
Non‑contact measurement – Eliminates mechanical wear and ensures long-term reliability
Flexible configuration – Available with or without reference point, with multiple output options via interpolators

Circular loop antenna with a metal RF connector and black cable attached.

Diagram of a two-path signal chain: Scale (BH20) to Interpolator (BD700) to USB serial A/B phase; and Scale to Analogue amplifier to produce 1 Vp-p analogue output.

How it works

The BH20 uses a diffraction grating interferometric principle with a semiconductor laser to measure angular position with high accuracy.

Signal pitch of 250 nm enables precise angular detection
Combined with interpolators (e.g. BD700), it produces high-resolution output signals
Non-contact optical detection ensures consistent, repeatable measurement performance