RLE system overview
The Renishaw RLE laser interferometer encoder system provides the measurement and positioning performance expected from an interferometer, with the ease of installation and use associated with traditional tape or glass scale based encoders.
Simple system architecture is achieved by using a fibre optic laser delivery system that enables the laser beam to be delivered directly to the measurement axis, eliminating multiple beam benders, splitters and mounts experienced with traditional displacement interferometers. This transformation of interferometer system architecture provides a system that can be installed in minutes, with a very small footprint.
Each RLE system comprises two core components - the RLU laser unit and the RLD detector head. These are available in various, user selectable configurations. Renishaw also supplies retroreflectors for integration with single pass detectors, and can provide mirrors and mounts for double pass applications.
Renishaw operates a policy of continual improvement. Specifications given in these pages are accurate to the best of our knowledge. However, Renishaw reserves the right to change product appearance and specification without notice and customers should always seek confirmation at the time of enquiry.
RLU laser units
Available in single or dual axis configurations, the RLU laser unit contains a HeNe (Helium / Neon) laser source, stabilisation electronics, fibre optic launch and axis position feedback electronics. RLU laser units are available with two frequency stability specifications: the RLU10, with a laser frequency stability of ±50 ppb over any one hour period, which is used within all RLE10 systems, and the RLU20, with a laser frequency stability of ±2 ppb over any one hour period, which is used within all RLE20 systems.
Standard systems have a 3 m or 6 m (RLE10 only) fibre optic umbilical connecting the RLD10 detector head to the RLU laser unit.
RLD10 0° launch detector head
Contains either a single or double pass interferometer (for retroreflector or plane mirror applications respectively), a unique, multi-channel fringe detection system, laser shutter and integral beam steerer.
A second varient of 0° launch detector head is available with no internal interferometer. This configuration allows an RLE system to be used with the linear, angular and straightness optics available from the calibration division.
RLD10 90° launch detector head
Contains either a single or double pass interferometer (for retroreflector or plane mirror applications respectively), a unique, multi-channel fringe detection system, laser shutter and integral beam steerer. This detector head can be mounted on either top or bottom face, to provide 90° or 270° beam launch orientation.
RLD10 DI (differential interferometer) detector head
Contains differential (column reference) interferometer optics, a unique, multi-channel fringe detection system and integral beam steerers, which provide independent pitch and yaw adjustment of measurement and reference beams.
Note: The RLD10 DI detector head is only suitable for plane mirror applications.
RPI20 parallel interface
Accepts differential analogue 1 Vpp sine / cosine signals and interpolates by 4096 to provide a 36-bit parallel format output with resolution capability of 38.6 picometres at 1 m/s. See Accessories for further details and specification.
RCU10 real-time quadrature compensation system
Utilises environmental sensors to monitor a machine's ambient environment and provides real-time compensation of the position feedback signals. See Accessories for further details and specification.