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TCS3 Encoder Design and Requirements for APE and IPE Systems

This document outlines the design highlights and requirements for the TCS3 encoder system, focusing on both Absolute Position Encoders (APE) and Incremental Position Encoders (IPE). The APE aims for an accuracy of approximately 6 arc seconds, while the IPE showcases a resolution of 20 counts per arc seconds, suitable for a 0.1 arcsec resolving requirement. Key features include embedded sensors in the telescope shaft, re-utilization of sensor components, and real-time data processing via an embedded CPU. Installation plans and system synchronizations between TCS1 and TCS3 are also discussed.

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TCS3 Encoder Design and Requirements for APE and IPE Systems

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  1. TCS3 Encoder Review Web Page Reference http://irtfweb.ifa.hawaii.edu/~tcs3/systems/tcs3/0309_Design/06_Encoders/ Requirements APE (Absolute Position Encoder)– Match present APE accuracy ~6 arc seconds. IPE – (Incremental Position Encoders) – Servo model shows the current IPE resolution of 20 count/arcseconds can sufficiently meet the 0.1 arcsec resolving requirement.

  2. TCS3 Encoder Design Highlights. APE Design Highlights: Sensors (Resolver/Transductor) is embedded in the telescope shaft. TCS3 will re-use sensor. Plan is to switch sensor between TCS1 & TCS3 readout electronics. TCS3 purchased new readout electronics. TCS3 electronic to be installed in parallel with TCS1. Embedded CPU to correlate and provide APE data via RPC. Embedded CPU to sample APE data at 20Hz. TCS3 to query embedded CPU at 10 Hz. Spare sensor parts purchased (transductor and resolver), but we could not replicated the mount/case. After tcs3 switch over, APE input to TCS1 will be disabled. IPE Design Highlights: 1. Use the current IPE. 2. Route IPE output to both TCS1 and TCS3. (TTL pulses) 3. Improvement to IPE must wait until TCS1 is decommissioned (or may not be part of this upgrade).

  3. Ape_plan

  4. Block_diagram

  5. APE Schematic

  6. APE Lab Setup Transducers Embedded PC Converter/preamp (transducer) Converter (resolver) Resolver

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