Positional control is now faster, more accurate

The new RLE10 fibre-optic laser encoder is claimed to eliminate many of the hitherto performance problems in respect of speed, accuracy and reliability.

The new RLE10 fibre-optic laser encoder from Renishaw for position feedback in all kinds of applications is said to have eliminated many of the hitherto performance problems in respect of speed, accuracy and reliability.

The RLE10 system embodies significant improvements in homodyne laser interferometry to overcome the disadvantages of heterodyne systems - principally by the use of fibre-optic beam delivery to simplify and reduce beam path, and provide exceptional position feedback performance in a compact package that is simple to design in.

Renishaw has exploited the latest amplifier and photo-detection technology to provide real-time differential sine/cosine outputs and industry standard digital RS422.

These industry-standard signals exhibit low noise (less than 0.1nm), high stability, minimal latency and lower latency variation than heterodyne systems.

Interpolation and counting circuitry provides nanometre resolution with unambiguous error detection on every reading.

Laser beam delivery and alignment is a simple, quick process, unmatched by any other system.

Homodyne systems, say Renishaw, are effectively real time as they avoid any digital signal processing delays.

In contrast, the zero-crossing detection method employed by some heterodyne systems, suffers from a variable and unpredictable delay as the system must wait for next zero-crossing to occur before it can produce a measurement.

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