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7th stabilization meeting

7th stabilization meeting. Optical measurement of the pole tips. Latest news from interferometers. Available options with plane mirror Michelson differential measurement from RENISHAW Fabry-Pérot sensors from ATTOCUBE SIOS multiple beams measurement. RENISHAW system.

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7th stabilization meeting

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  1. 7th stabilization meeting Optical measurement of the pole tips

  2. Latest news from interferometers • Available options with plane mirror • Michelson differential measurement from RENISHAW • Fabry-Pérot sensors from ATTOCUBE • SIOS multiple beams measurement -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  3. RENISHAW system • Michelson interferometer • Characteristics : -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  4. RENISHAW system • Setup : -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  5. RENISHAW system • Assets : • Easy setup • Easy alignment • Real differential measurement (same reference for two beams) • Defects: • Sales department -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  6. ATTOCUBE system • The attoFPSensor is based on a fiber-based Fabry-Perot interferometer which consists of a single-mode fiber mounted in a fiber probe and a sensing element. The space between the fiber probe and the reflecting surface is called the cavity length. The reflected light is wavelength modulated in exact accordance with the cavity length. Cavity length Reflecting surface lens Sensor Fiber probe extremity (reflecting surface) photodiode -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  7. ATTOCUBE system • Characteristics -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  8. ATTOCUBE system • Characteristics -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  9. ATTOCUBE system • Assets : • Compact size • Easy and customized setup • Firm attention • Defects : • No multiple beam measurement available • No differential measurement possible (synchro problem to face) -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  10. SIOS system • See Kurt for further information -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  11. First test with differential interferometer • Connectivity • Interface USB 1 COM 1 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  12. First test : configuration setup Laser unit Measurement head Interpolation device NI acquisition -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  13. First test : acquisition • Configuration : • USB port + RENISHAW interface • Analogic I/O + home made LabView screen • No temperature, pressure, hygrometry devices connected • Correction made with default condition (T, P, Hy) put in RENISHAW interface • Wavelength correction made with Edlen modified formula in both interfaces -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  14. First test : result • Easy to connect • Easy to align • Easy to setup and communicate with (when you are given the right switches configuration) • A value offset still remains between analogical and Renishaw interface (can be solved quickly) -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  15. Qualification test Measurement of a movement given by a calibrated actuator (amplitude and frequency) Measurement head Plane mirror Calibrated movement Actuator Can be carried out with 2 Attocube sensors (swapped if necessary) -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  16. Application to pole measurement • Possibility to drill the poles to be accepted -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  17. Application to pole measurement • Information needed : • Permit drilling poles • If allowed, maximum diameter dimension • Problem of measuring extremities : • Mechanical compatibility with magnet elements • Possible use of a vibrometer -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

  18. Next steps • Test with actuator : • Analog./digital I/O • Turbulence protection • ATTOCUBE proposal to be tested • Adaptation to the mock up for measurement -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

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