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Iván Vila Álvarez Instituto de Física de Cantabria (CSIC-UC )

Fiber Bragg Grating Sensors for Structural & Environmental monitoring of Pixel and Tracker Systems SVD meeting. Iván Vila Álvarez Instituto de Física de Cantabria (CSIC-UC ). Outline. An introduction FOS sensor for the environmental and structural monitoring Case of use:

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Iván Vila Álvarez Instituto de Física de Cantabria (CSIC-UC )

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  1. Fiber Bragg Grating Sensors for Structural & Environmental monitoring of Pixel and Tracker Systems SVD meeting Iván Vila Álvarez • Instituto de Física de Cantabria (CSIC-UC)

  2. Outline • An introduction FOS sensor for the environmental and structural monitoring • Case of use: • Current R&D for a FOS-based monitor for the PXD detector. • Final Remarks. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  3. FOS for environmental and structural monitoring industry driven technology I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  4. Fiber Bragg Grating Optic Sensor 101 • Keep in mind: Physically, FGB sensors are a section of an optical fiber with a length of few millimeters. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  5. Fiber Bragg Grating Optic Sensor 101 (2) I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  6. Advantages of FBG sensors • General attributes of Fiber Optic Sensors: • Immunity against: High electromagnetic fields, high voltages. High and low temperatures. Nuclear radiation environments (not in all the cases) • Light-weight, miniaturized, flexible, low thermal conductivity. • Low-loss, long-range signal transmission(“Remote sensing”) • Specific FBG attributes: • Multiplexing capability (sensor network) • Embedding in composite materials. • Wavelength encoded ( neutral to intensity drifts) • Mass producible at reasonable costs. • Very high and low temperatures (4 K to 1200 K). I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  7. Case of use: Current R&D for a FOS-based monitor for the PXD detector • For the last two and a half years, joint project with the Spanish Aerospace Agency (INTA) on the implementation of FOS sensors in HEP applications. • Main R&D lines for PXD detector: • Real time Monitoring of SVD-PXD relative position. Development of FOS-based high precision, miniaturized, radiation resistance displacement sensor. • Qualification of commercial FOS sensors against radiation. • Integration of temperature monitoring fiber sensor in PXD envelope. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  8. FGB-based displacement sensor • New development starting from an proposal of the late BTeV vertex detector: “ The omega-like gauge” • Mechanical displacement range adapter: converting strain to displacement. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  9. FGB-based displacement sensor (2) • First prototypes tested very recently. • Excellent linearity, about ±1 mm range and 1 um resolution. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  10. FBG radiation hard assessment: Motivation • Most the current irradiation studies dedicated to aerospace missions and nuclear industry: Continuous gamma and neutron fields. • In HEP a more complex mixture of radiation types and presence of long annealing periods between accelerator programed stops. • We have irradiated the sensors up to SLHC levels and specifically to Belle-II levels • Reproducing behaviors shown with gammas: saturation and strong fiber coating dependence. • Still more work needed to understand long term annealing effects. I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  11. Diagnosing tools: PXD Thermo-mechanical mock-up FBG attachedCooling Block FBG attached Beam Pipe Dry Air Cooling block and Beam Pipe cooling Free FBG outside cage I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  12. Final Remark • As a very, very preliminary approach, it seems very feasible the integration of FBG sensors on the SVD enclosure CFRP cylinder for temperature and deformation monitoring seems • Other opportunities are the integration of FBG for the sensing of temperature and humidity (R&D in progress) in the SVD volume. • We are willing ( and insterested )to develop a FOS-based environmental and structural monitor for the SVD I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  13. THANK YOU ! I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  14. PXD thermo-mechanical mock-up (3) Enviromentalmeasurement Chiller swich off Dry air off Chiller swich on Dry air on Chiller on Minimum RH Opening of the thermal enclosure Dry air induced thermal turbulences Chiller off 14 I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

  15. Our current and (expected) future R&D on FOS • Study of the radiation FOS resistance as function of the coating and doping types a level of the sensor fiber. • Real time structural and environmental monitoring (temperature, movements, vibrations and humidity) of PXD and SVD subdetector at Belle-II (jointly with INTA, IFIC and HEPHY) • Intensity profiling of beam particles recently probed (quite handy for finding particle beam position). I.Vila, vila@ifca.unican.es - DESY, 25th Nov. 2011.

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