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Thermo-Cooler System Update: Spectrum Analysis and Design Improvements

In our latest update on the Thermo-Cooler project, we conducted a spectrum analysis and confirmed our system exhibits low-pass behavior, with no response detected above ~1Hz. This reassured us of the accuracy of our current model. We revised our approach to avoid potential issues in the final deliverables. We are now equipped to test our lag compensator, focusing on the critical measurement of temperature differences and developing a driver using a difference amplifier circuit. A meeting with Avi is scheduled to finalize our design and ensure smooth integration moving forward.

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Thermo-Cooler System Update: Spectrum Analysis and Design Improvements

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  1. Thermo-Cooler Controller Kiefer, Mary, Molly, Sam

  2. Update • We attempted the spectrum analysis • We learned that we weren’t getting a system response at frequencies over ~1Hz • Verified that our system is extremely low pass • Convinced us that our current model is accurate and doesn’t need revision • We were worried before that we weren’t accounting for high frequency poles of our system

  3. Update (cont.) • We restructured our approach b/c with the old one, we had the potential of running into huge problems at the end • We now build-up to the final deliverable (get something working now and improve it) • We went up to the vacuum today ready to test our lag compensator • Realized we were missing two things: • Something to measure the difference between our current temperature and our set point temperature • The “driver” that takes this difference to control the signal • Solution: a difference amplifier circuit

  4. Current Assignments • We’re meeting with Avi at 6:30pm tonight to verify our system design • Confirm the difference amplifier driver • Confirm our understanding/approach • After this meeting, we should be able to build our driver circuit and interface it to the compensator • We are optimizing Lead-Lag compensation • Compare these simulation results to the Lag results to decide if it’s worth implementing • Researching how to build the Lead-Lag compensation in hardware so we’re ready when we make a decision

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