1 / 18

CMOS sensors: a short introduction

CMOS sensors: a short introduction. What’s a CMOS sensor?. A new technique for pixel detectors. 20 m. A sensor (1 million pixels). A hair: microscopic view, same scale. 0.5 millim eters. A prototype on its test board support. 15 cm. A single pixel.

floyd
Download Presentation

CMOS sensors: a short introduction

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CMOS sensors:a short introduction

  2. What’s a CMOS sensor? A new techniquefor pixel detectors

  3. 20 m A sensor (1 million pixels) A hair: microscopic view,same scale 0.5 millimeters A prototype on its test board support 15 cm A single pixel Zooming on the sensor makes the pixels visible Sensors are produced on silicon wafers(30 to 50 units) moi

  4. How does thatwork?

  5. - - - - - - - - - - - Free charges are created, then collected by the diode (positively charged) The particlegoes through Let’s cut a pixel. We see its composition andwhat happens when a particle goes through Charges collected are integrated to build an amplified electric signal moi Micro-circuits for signal treatment Collector Layer sensitive toparticles Supporting bulk (insensitive)

  6. Hit pixel Signal amplitude Column number Line number Particle crossing positionis identified precisely The particle goes through Steering and analysis Information from each pixel are transmitted to PC moi Particle crossing position is identified precisely

  7. Tracking particles 3. What’s for ?

  8. e+ 10 cm e- 25 cm Barrel type detectormade of 5 sensor layers Particles need to be tracked very near the collision point: this is the place for the thin and granular CMOS sensors moi moi

  9. To build a tracking detector A. Individual sensor assembly on a ladder Carbon fiber supporting ladder B. Ladders are arranged on a hermetic barrel moi

  10. A tracking device Barrel of ladders with sensors Initial particle collision point. Newly created particles are emitted in all directions e- e+ 10 cm moi moi

  11. Knowing the particle crossing point with a high accuracy, allows computerized algorithms to reconstruct the full trajectory of each particle. moi

  12. Imaging 3. What’s for ?

  13. Particle physics tracks particles in space Imaging camera tracks emission sources in time space time • Single particle sensitivity for imaging devices offers: • Infinite dynamics • Better image definition • Noise reduction Cockroach head from synchrotron light source (5.2 keV X-rays) with a CMOS sensor Tracking sensors need to detect single particles Imaging versus tracking 3D space trajectory 2D space + 1 time trajectory

  14. Photons hit the photocathode and get converted into electrons Electrons are accelerated by the E-field Detecting single photons from visible light Lilly root cell, through epi-fluorescence microscopy using an EB-CMOS camera Accelerated electrons are individually detected by the CMOS sensor

  15. The pioneering group for particle tracking 4. CMOS sensorat IPHC

  16. Charge collection & technology studies – simple demonstrators Real size prototype - yield studies Reticule 2x 2 cm 2006 Pixel Array Mimosa22 Discriminators Zero Suppression Suze 2007 Sara 2006 2008 2007 Bias Readout Final circuits – sub-blocs integration Data compression - digitization MIMOSA sensors: a coherent evolution 1999 Production

  17. Industry:SAGEM PHOTONIS Collaborations: The USA:Fermi Nat. Lab. Brookhaven Nat. Lab. L.Berkeley Nat. Lab. Europe:France: Lyon Uni., CEA Germany: DESY, GSI, Frankfurt Uni. Italian subatomic physics lab. (INFN) Switzerland: CERN, Geneva Uni. China:Dalian Uni. Xian Uni. More than 30 sensors designed & tested since 1999 ! Our CAD center

  18. The end

More Related