Laser encoder delivers nanometer accuracy

Sept. 16, 2004
Laser encoders used to measure position can be complicated and difficult to install.

A simplified design, the RLE10, from Renishaw Inc., Hoffman Estates, Ill. (www.renishaw.com), combines multiaxis capabilities with a compact detector that holds the interferometer, reference-path optics, fringe detector, and beam steerer. Fiber optics deliver laser light from a single source to detectors measuring different axes, which simplifies the optical path and facilitates alignment and installation. Only one external optic is needed. Placing the laser source outside the detector also saves space and keeps heat away from the measurement axis to reduce thermal drift.

The detector is available in versions for planar or linear applications, and they can be used on axes of up to 4 m. It also provides RS-422-format, digital quadrature outputs and analog 1-Vpps sin/cos signals. Resolutions to subnanometer levels can be obtained with external interpolation of analog signals. An optional real-time compensation system for "in-air" applications gives accuracies on the order of 1 ppm.

Sponsored Recommendations

June 24, 2025
When a leading material handling equipment supplier needed a specialized drive solution, Parvalux delivered a custom motor and gearbox combination engineered to meet their exact...
June 24, 2025
Ideal for companies with large quantities of pallets and trays, automated shuttles are driven by electric motors along rails inside warehouses to maximize capacity and create ...
June 24, 2025
Conveyors can be a cornerstone of modern industrial operations, alleviating the burden on workers and increasing efficiency. Choosing the right set-up ensures an effective, productive...
June 24, 2025
Using conveyor belts, in-line weighing, dimensioning and label application technology, sorting systems efficiently direct packages and letters to designated locations for distribution...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!