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Test & measurement


impact metals, as they expand and contract with temperature changes. So, when designing the bespoke mounting brackets to attach the new encoders to the telescope, we had to account for thermal expansion to ensure that weather conditions did not impact the accuracy of the telescope.”


The SoluTion


The Soulutions team suggested installing two Renishaw RESOLUTE absolute encoders onto the telescope. The RESOLUTE series is the world’s first absolute encoder capable of 1 nm resolution up to 100 m/s for


linear systems, and 32-bit resolution up to 36,000 rev/min for rotary systems. Ultra-low Sub-Divisional Error (SDE) and jitter result in a linear encoder system that outperforms any other encoder in its class. The team chose encoders with RTLA30-S linear scale, a low-profile stainless steel tape scale that has mounting options that allow for thermal expansion and the convenience of tape scale. This technology offers unrivalled ruggedness, excellent motion control performance, wide set-up tolerances, improved positional stability and ±40 nm Sub-Divisional Error for smooth velocity control. “During our first visit to the observatory


we decided that we could not remove the original encoders from the telescope, because it would require us to disassemble the entire telescope, increasing downtime for the research team,” says Naim. “Instead, we suggested disconnecting the original encoders and attaching the new encoders using bespoke manufactured mechanical brackets, allowing us to complete the project quickly and efficiently.” The team installed the linear encoders to each axis of the telescope during two visits to site. The roll axis controls the orientation of the telescope, which is used to view different areas of sky, while the pan axis controls the side-to-side movement of the lens and camera. “Renishaw’s Advanced Diagnostic Tool


(ADTa-100) allowed us to test the technology before connecting it to the telescope’s controller,” says Naim. “We used the software to confirm that both encoders give good feedback, to check the signal strength across the full axis movement and to


ensure good motion control. Once we knew the installation was successful, we connected the system to the controller.” Renishaw’s ADTa-100 acquires


comprehensive real-time data from Renishaw’s RESOLUTE absolute encoders and displays this information via the user-friendly ADT View software interface. This tool can be used to report on encoder performance in challenging installations or assist in system fault-finding to avoid lengthy machine downtime.


The ReSulTS “The combination of advanced Renishaw technologies and a local, knowledgeable team helped us quickly find the best solution for our application,” explains Arie Blumenzweig, at the Wise Laboratory. “The accuracy, resolution and reliability


of the positioning subsystems of our telescope have been improved beyond recognition. We are now studying ways of further enhancing our methodology to capitalise on these new capabilities.” “This project was unique and challenging for the team, but it was also rewarding,” continues Naim. “After one month of operation, the researchers have reported excellent feedback from the system and have asked us to start upgrading other telescopes at the Wise Observatory. We’re excited to see how Renishaw’s technology can further support this field of research.”


Renishaw www.renishaw.com/en/resolute-encoder- series--37823


Renishaw distributor upgrades telescope for astronomy research


Eyes on the skies


Instrumentation Monthly May 2021 25


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