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Advanced Structural Temperature Monitoring Solutions for Precision Instrumentation

This document details the capabilities and configurations of our latest PTCS instruments designed for structural temperature monitoring across 30 locations. Featuring an interchangeable accuracy of 0.2°C and a resolution of 0.01°C at a 1Hz sampling rate, the instruments estimate thermal gradients and evaluate pointing accuracy under various conditions. Applications include temperature-dependent models for optical alignment, measurement of tip displacement, and integration with accelerometers for performance prediction. Ongoing upgrades will enhance stability and control, ensuring precise monitoring in dynamic environments.

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Advanced Structural Temperature Monitoring Solutions for Precision Instrumentation

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  1. Instrumentation K. Constantikes

  2. New PTCS Instruments

  3. Structural Temperature • ~ 30 locations, 0.2C interchangeable accuracy, 0.01C resolution, 1Hz. COTS solution. • Estimate gradients in alidade, horizontal and vertical FA, primary. • RSI predicted 19” pointing error for 5C (uniform) gradient w/ 270 solar azimuth. • Uses: • Temp dependent optical alignment model (focus tracking) • Temp dependent primary model • Temp dependent pointing model • Implementation order • Vertical FA • Alidade • Encoder • Primary • Horizontal FA

  4. Temperature Sensor Locations

  5. Pointing Accuracy, 5° C Gradient, 95° El

  6. Pointing Accuracy, 5° C Gradient, 5° El

  7. Tipping Structure Contributions, 5C in X direction

  8. Tipping Structure Contributions, 5C in Y direction

  9. Tipping Structure Contributions, 5C in Z direction

  10. Quadrant Detector • Measures FA tip displacement in plane ~ normal to principle ray of GBT • 10 Hz, ~12mm resolution. FS Nonlinearity < 5mm. Noise strongly dependent on atmosphere, ~<300mm. • Tested summer ’02. Upgrades in temp stability, control, monitoring, and calibration in progress • Uses: • Short-term SR control signals (may use accelerometers and dynamical model) • Assist in FA LRF position estimation

  11. Quadrant Detector

  12. QD Performance Prediction

  13. Accelerometers • 10 Hz 3-axis seismic MEMS accelerometers, ~2mG/root-Hz • Locations: FA tip, left and right El bearings • Uses: • Rate assist QD • Structural vibration mode shape and frequency • Inclinometers

  14. Vertical Air Temperature • ~ 13 locations on alidade and vertical FA, 0.2°C accuracy, 0.01°C resolution, 1 Hz. • DNg/DT ~ -.9 ppm/ °C : Need path average < 0.4ppm • Expect to use same COTS solution as structural temp

  15. FA Tip Barometer • LRF DNg/DP ~ 0.3ppm/mbar: Need path average Hg < 0.4 ppm. • Path barometric pressure thought to be more predictable than temperature. • Use ADC and control in QD laser assembly

  16. Hot-Wire Anemometers • Possible locations on FA tip, primary rim, alidade. • 0.1m/s accuracy, 0.05 resolution, 10 Hz rate, 0-25 m/s • Uses: • Correlation and correction of wind loading pointing effects

  17. Existing PTCS Instruments • Az/El encoders • SR link encoders • Active surface panel encoders • Holography • Weather stations (3) • 2-axis FA tip accelerometer • LVDT primary temperature sensors

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