7th stabilization meeting

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Transcription de la présentation:

7th stabilization meeting 24 avril 2017 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 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Michelson interferometer Characteristics : RENISHAW system Michelson interferometer Characteristics : Range 0 m - 1 m Cyclic error <1 nm Output signal format Digital - RS422 quadrature Analogue - 1 Vpp sine / cosine Maximum velocity 1 m.s-1 Laser type HeNe (Helium / Neon), 632.8 nm, Class II Laser lifetime >50,000 hours 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Setup : RENISHAW system 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Assets : Defects: Easy setup Easy alignment RENISHAW system Assets : Easy setup Easy alignment Real differential measurement (same reference for two beams) Defects: Sales department 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Fiber probe extremity (reflecting surface) 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 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Characteristics ATTOCUBE system Wavelength tuneable near 1300 nm, 1550 nm other wavelengths on demand Range collimated light working distance up to 100 mm (more on demand) spot diameter ~500 µm @100mm (fiber: Corning SMF-28) focused light diffraction limited - focusing lens with NA ranging from 0.1 to 0.6 - confocal microscopy objectives Smallest detectable motion @ 10 Hz 225 pm (at 75 µW laser power; 300Hz BW) @ 100 Hz 100 pm (at 75 µW laser power; 300Hz BW) 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Characteristics ATTOCUBE system Head Characteristics stainless steel, titanium collimating lens holder diameter 11 mm, length 35 mm Repeatability limited by wavelength lower than 1.5 nm over target distance of 20 mm Speed only reading 6 µm/s low precision (wavelength/16 increments) 150 µm/s high precision 30 µm/s Maximum Bandwidth usual 1 ms per data point higher on demand Optical fibre single mode fiber 250 µm diameter, plastic coated for RT and LT operation metal coated for UHV compatibility on demand 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Assets : Defects : Compact size Easy and customized setup 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) 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

See Kurt for further information SIOS system See Kurt for further information 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

First test with differential interferometer Connectivity Interface USB 1 COM 1 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

First test : configuration setup Laser unit Measurement head Interpolation device NI acquisition 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

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 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Easy to connect Easy to align 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) 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Can be carried out with 2 Attocube sensors (swapped if necessary) 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) 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

Application to pole measurement Possibility to drill the poles to be accepted 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

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 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)

ATTOCUBE proposal to be tested Next steps Test with actuator : Analog./digital I/O Turbulence protection ATTOCUBE proposal to be tested Adaptation to the mock up for measurement 25/09/2008 -MichelFontaine- CLIC Stabilisation ("pied de page" et "date" -> onglet menu Affichage/En-tête)