Transcript RadHardCamera_RadWGx

Radiation Resistant Camera
Project status meeting, St Etienne, 7th and 8th of march 2016
Project lead by Fusion For Energy (F4E)
European Agency for ITER project
Elisa Guillermain
[email protected]
Project context
• F4E for ITER Remote Handling operations
• Tasks :
• OTL for sub-components development
• SCK for radiation testing
• Components :
• ISAE for the image sensor
• UJM (Laboratoire Hubert Curien) for the optical systems (lens)
• CEA for the illumination systems (LEDs)
Aim and requirements
• Primarily : Diagnostic remote handling tool for welding and cuts.
• Willingness to use it for other applications.
• Foreseen characteristics :
Parameter
Minimum
Requirements
Targeted Values
Minimum distance (mm)
10
10
Maximum distance (mm)
150
20000
Size (mm)
50x50x76
40x40x76
Mass (kg)
2
1
Radiation TID (kGy)
65
1000
Maximum temperature (°C)
50
70
Image
Sensor
Optical
System
Illumination
System
Sub-components : Image Sensor
• CIS technology / CMOS Image Sensor.
• Chips of 256x256 pixels.
• Aimed is HD with 1280x720 pixels.
• Color array is developed.
• Tested up to 10 MGy in recent publication.
• Tested at Gammas only.
• Validation tests :
• Electrical transfer function,
• Dark current,
• Saturation voltage larger than 500 mV,
• Read noise below 1 mV RMS,
• …
Sub-components : Optical System
• Working distance = 100 mm.
• Field of view = 20 mm.
• Glass choice :
• Low Radiation Induced Attenuation (RIA).
• Low Refractive Index Change (RIRIC).
• Lenses under realization.
• 4 mm diameter lenses.
• But need to develop testing tool for such small lens !
Sub-components : Illumination System
• Off the Shelf LED.
• Allow for low price
• High luminosity, Small sized selected.
• Two types :
• Amber for monochrome sensor.
• White for color sensor.
• Tested with an integrating sphere.
• Intensity, spectra…
• Acceptance criteria:
• Decrease of flux shall be less than 20%.
Project status overview
• Validation of each sub-component.
• Assembly of sub-components → Demonstrator.
• Image acquiring : pre-irradiation reference.
• Irradiation testing of all sub-components.
• Gamma rays, 1 MGy. End 2016.
• IS : Passive and Active tests (not image acquiring in active test).
• OS : Passive test, Active test (RIA) is foreseen but to be developed.
• IS: Passive tests, active tests are not foreseen.
• Assembly.
• Post-irradiation image acquiring.
• Compare the image quality with pre-irradiation reference.
Project Follow-up
• Development plan & cost estimation to come.
• Final camera integration.
• Industrial partners.
• Upgrade to focusing / zoom.
• mandatory ? (depth of field…)
• Or, foreseen at a later stage.
• Proposal for Wavefront Coding.
• Allow for a much larger depth of field.
Thanks for your attention !
Gamma Irradiation Tests : Image Sensor
• Up to 1 MGy, steps (0.1 MGy, 0.5 MGy and 1 MGy), 0,5 to 1,5 kGy/h, end of 2016 (October).
• Image sensor.
• Offline test:
• Image capturing,
• readout noise, dark current, electrical transfer function, charge to voltage conversion factor,
saturation level, responsivity…
• Online test:
• Half of the sensors grounded, half dynamically biased (sequenced).
• Measure of the temporal average of the pixel reference voltages.
• Info on the readout chain transistor health and functionality of digital circuits.
• Acceptance criteria:
• Dark current below 2 pA,
• Saturation voltage larger than 500 mV,
• Read noise below 1 mV RMS,
• …
Gamma Irradiation Test
• Up to 1 MGy, steps (0.1 MGy, 0.5 MGy and 1 MGy), 0,5 to 1,5 kGy/h, end of 2016 (October).
• Optical System.
• RIA to be measured both offline and online (setup to be developed).
• RIRIC to be measured offline.
• Illumination System.
• LED will be biased.
• Offline test :
• Flux and spectra measurement.
• Online test not foreseen.
• Acceptance criteria:
• Decrease of flux shall be less than 20%.
• Up to this value, the decrease can be compensated by increasing output power.
Other radiation resistance aspects
• Mixed field particles irradiation test.
• Not foreseen (foreseen application not in demand).
• TID effect (i.e. dark current) are expected to be more important
than neutron effects in CMOS.
• Proposed to test the camera at CHARM. Set up a collaboration ?
• Asses camera behavior under / during radiation.
• Need for a reliable test.
• Estimate of remaining lifetime.
Other camera characteristics
• What will be the frame rate ?
• 25 fps targeted before irradiation.
• Increase shall be possible up to 50 – 100 fps.
• For higher speed, need dedicated development.
• Will it blinded while exposed to gamma photons ?
• Low dose rate.
• Short exposure time (for a good dynamic range even with the high current
level after irradiation).
• Will not be checked at first irradiation test stage, but will later on.
• When would it be ready for a test at CHARM ? (components,
demonstrator…).
• CIS and LED can be available.
• Not optical system.