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Company profile & Space Science Detector Capabilities. - Ian Cox. Company Profile.

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company profile
Company Profile
  • Specialist manufacturers of vacuum based detectors and camera systems for photon detection. Photek manufacture Image Intensifiers, PMT’s, Streak Tubes, open faced detectors and a range of associated electronics and camera systems
  • Located in St Leonards-on-Sea – South East England
  • Established September 1991
company profile1
Company Profile
  • 36 Employees
    • 10 sales/administrative
    • 7 R&D
    • 19 production/test
  • 5 employees educated to PHD level
  • Further 8 employees educated to degree level
detector products
Detector Products
  • MCP image intensifier
  • Ultra fast MCP photomultipliers
  • Streak tubes
  • Magnetic focus image intensifiers
  • De-magnifying gen 1 image intensifiers
  • Vacuum compatible detectors
camera products
Camera Products
  • Photon counting
  • Nanosecond ICCD
  • Intensified CCD
  • Fluorescence
  • X-ray
  • Particle imaging
electronic products
Electronic Products
  • HT power supplies
  • Nanosecond gating control
  • Laser pulse generator
  • Preamplifier
  • Image intensifier cooling
applications
Applications
  • Early warning Missile systems
  • Wafer silicon inspection
  • Astronomy including orbital space science experiments
  • Ultra-high speed cameras
  • Nuclear & high energy physics research
  • Life-science research
  • Industrial processing
  • Security
facilities
Facilities
  • 1,500m2 factory space
  • Class 100 assembly area
  • Class 10,000 clean room
  • Electro-mechanical vibration table
  • Ultra-high vacuum processing equipment
  • High speed (50 ps) laser pulsing equipment
  • Wet and dry hydrogen stoving capability
  • Inventor 3-D CAD software
facilities continued
Facilities – Continued
  • Protel Electronic Design Software
  • Agilent 18 GHz sampling scope
  • LeCroy 5 GHz digital scope
  • Spectrometer
  • Photometer
  • Optical table and dark room facilities
  • Environmental test chamber
  • Phosphor screen production and inspection facilities
  • Optical coating plant
quality
Quality
  • Photek operates a company wide quality system based on ISO9000 and TQM principles
  • Currently working towards ISO9000 accreditation with successful implementation expected in 2008
  • We operate a strict stock control and inspection policy with all items batch controlled and tracked
  • All detectors and systems are fully characterised in out photometry laboratory
  • Each device has a serial number that is used throughout the entire manufacturing process
test and support
Test and Support
  • Excellent support and test facilities
  • Rigorous testing of all products is completed before release
  • Support question always answered by a technical member of staff. Typically educated to PHD level
  • 12 month warranty on all products
  • Technical support for lifetime of product
space science projects
Space Science Projects
  • ACE Advanced Composition Explorer
  • XMM UV Optical Monitor
  • MSX UVISI Detector
  • GUVI Global Ultraviolet Imager
  • SSUSI Special Sensor Ultra-violet Spectrographic Imager
  • UVIT Ultra-Violet Imaging Telescope
advance composition explorer
Advance Composition Explorer
  • CRIS Detector (Cosmic Ray Isotope Spectrometer)
    • 40 mm Image Intensifier with 2 MCP
    • UV Fibre Optic Input Window
    • Blue Enhance Cathode to Match Scintillating Fibre Optics
    • 100,000 Gain
  • Uses scintillating fibre optic structure. The detector is to measure direction and energy of cosmic rays
uv optical monitor
UV Optical Monitor
  • Photon Imaging 170 nm to 550 nm region
  • Aligned with X-Ray Telescope
  • Provides Simultaneous Visible, UV and X-ray Images
the xmm detector
The XMM Detector
  • 25 mm Photon Counting
  • High Sensitivity in the 170 nm to 550 nm Region
  • Built in Fibre Optic Taper
  • Concave Input Window
mid course space experiment
Mid Course Space Experiment
  • Johns Hopkins University
  • Launched 24 April 96
  • Part of the spectrograph on the UVISI Instrument
  • Diffuse and Discrete Aurora
  • Low Earth Atmosphere Phenomena
msx uvisi detector
MSX-UVISI Detector
  • 40 mm Photon Counting Image Intensifier
  • MgF2 Input Window
  • CsI Photocathode
  • 100 nm – 250 nm Response
global ultra violet imager
Global Ultra Violet Imager
  • Johns Hopkins University Applied Physics Laboratory
  • Launched on the TIMED Spacecraft during 2001
  • TIMED is used to study the energetics and dynamicsof the Mesosphere and lower Thermosphere between an altitude of approximately 60 to 180 kilometers.
  • GUVI is a far-ultraviolet (115 to 180 nm), scanning imaging spectrograph that provides horizon-to-horizon images in five selectable wavelength intervals
guvi detector
GUVI Detector
  • 25 mm UV Photon Counting
  • MgF2 Input Window
  • CsI Photocathode
  • Wedge and Strip Anode
  • 106 cps
  • 3x106 Gain
ultra violet imaging telescope
Ultra-Violet Imaging Telescope
  • Indian Space Research Organisation (ISRO)
  • Due to launch on the ASTROSAT spacecraft during 2008 – now delayed until 2012.
  • ASTROSAT aims are to investigate the origin and mechanism of radiation emissions in active galactic nuclei.
  • UVIT aims to provide flux calibrated images of the sky in the far-UV, near-UV and visible spectral regions
summary
Summary
  • World leading space science vacuum detector manufacturer
  • Photek have the experience and knowledge to produce detectors to the most stringent space science requirements
  • Quality systems in place to ensure repeatability of detector manufacture
  • Test and support facilities give first class support for the lifetime of our detectors
uvit detectors
UVIT Detectors
  • Three 40 mm photon counting detectors
    • Far UV (120-180 nm)
    • Near UV (180-300 nm)
    • Visible (180-550 nm)
  • Integrated fibre optic taper with bondedFillFactory Star 250 CMOS sensor
uvit detectors1
UVIT Detectors

Photek have supplied 7 detectors for the UVIT project

  • NUV EM
  • NUV FM and FS
  • FUV FM and FS
  • VIS FM and FS
outline specification
Outline Specification
  • FUV Detector 120-180nm
  • MgF2 Input Window
  • CsI Solar Blind Photocathode
  • 2x 60:1 40mm MCP’s
  • P46 Phosphor
  • Fibre taper output
  • Star250 Sensor
  • NUV Detector 180-300nm
  • Fused Silica Input Window
  • CsTe Solar Blind Photocathode
  • VIS Detector 180-550nm
  • Fused Silica Input Window
  • Low Noise S20 Photocathode
cathode recess
Cathode Recess

A

The cathode recess is measured from the front of the DM mounting ring and the front of the input window.

B

C

View from front of detector

window thickness
Window Thickness

A

The window thickness is an optical measurement from the photocathode surface to the outside surface of the window.

B

C

View from front of detector

cathode to mcp gap
Cathode to MCP Gap

A

The cathode gap is measured from the photocathode surface of the input window to the front of the MCP

B

C

View from front of detector

electrical operating voltages
Electrical – Operating Voltages
  • Cathode and MCP voltage WRT ground (MCP Input).
  • Anode voltage WRT MCP output.
  • Optimal voltages are voltages as tested at Photek
  • The maximum specified voltages should not be exceeded
  • Each electrode has been over voltage (O/V) tested to the stated value
slide32

FUV FM Gain Calibration

-100V

-50V

Nominal

+50V

+100V

Cathode -270V

MCP 2580V

Anode 3500V

Cathode -270V

MCP 2480V

Anode 4000V

Cathode -270V

MCP 2400V

Anode 4500V

Cathode -270V

MCP 2350V

Anode 5000V

Nominal

Cathode -270V

MCP 2300V

Anode 5500V

event size
Event Size

Note:

The approximate FWHM of the event footprints has been measured and the results shown above for a range of operating voltages.

dark noise
Dark Noise

Count rate graph shows variation of count rate on a 1 second timescale.

2 Hour Dark Noise Image @22C

No bright defects detectable Average rate 5cps

image alignment
Image Alignment

B

A

C

D

View from front of detector

Star250 Readout

uniformity
Uniformity

Horizontal / vertical cathode uniformity

Average uniformity

SD/Mean=4.5%

environmental testing
Environmental Testing
  • Encapsulation of detector
  • 24 Hour / 40C Bake to cure Arathane
  • Qualification level thermal cycle
  • Bond Star250 sensor
  • Vacuum Test
  • Acceptance level thermal cycle
  • Acceptance level vibration tests
  • Final acceptance tests

Note: Detector is tested after each stage of environmental testing

vacuum test
Vacuum Test
  • Photek do not have full thermal vacuum test facilities.
  • The following compromise test was agreed:
  • Place detector in a vacuum chamber
  • Leave for 24 hours @20C
  • Increase the room temperature to 30C and leave for 48 hours
  • Reduce room temperature back to 20C and leave for 24 hours
thermal cycle
Thermal Cycle

Qualification Level Thermal Cycle

+35˚C -15˚ C

+45˚C -25˚C Peaks

Acceptance Level Thermal Cycle

+30˚C -10˚C

+40˚C -20˚C Peaks

Note: Short cycles 2hrs, long cycles 24 hrs

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