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Single Photon Counting Pixel Detectors
M-01
10
Key specifications
M-02
6
Applications
M-03
6
Performance features
Overview
Technical record / 0001
The Medipix family of hybrid pixel detectors is developed by an international collaboration led by designers at CERN. Originally invented for pattern recognition in particle tracing at the LHC, this technology has evolved into a versatile platform for single photon counting across multiple application domains.
Multiple chip generations are available: Medipix2 (256×256 pixels, 55µm pixel size, 1MHz counting rate), Medipix3 (charge summing mode for color imaging), and Timepix3 (simultaneous ToA and ToT measurement with 10ns time binning). All chips are 3-side buttable for tiling into larger arrays.
Key Features
What Sets This Product Apart
01Single photon counting with zero noise — no dark current sensitivity
02Energy window selection via pixel-wise upper/lower threshold adjustment
03Charge summing mode (Medipix3) mitigates charge sharing for spectral imaging
04Dead-time-free continuous read/write for real-time imaging
053-side buttable design enables tiling into large-area detector arrays
06CERN-derived technology with decades of validation in high-energy physics
Specifications
Technical Details
- 01Pixel Size: 55µm × 55µm (Medipix2/3), 75µm × 75µm (Medipix4)
- 02Pixel Matrix: 256 × 256 (Medipix2/3), 512 × 448 (Medipix4)
- 03Sensitive Area: 1.4 × 1.4 cm (single chip), up to 6.93 cm² (Medipix4)
- 04Energy Range: From 3 keV upwards
- 05Maximum Count Rate: 1 MHz (Medipix2), 826 Mcounts/mm²/s (Medipix3)
- 06Imaging Rate: Up to 20 frames per second (continuous read/write)
- 07CMOS Technology: 0.13 µm (Medipix3), 65 nm (Medipix4)
- 08Energy Resolution: ~2.5 keV FWHM (CdTe, CSM, 60 keV)
- 09Power Consumption: 440 mW analog + 450 mW digital (@100 MHz)
- 10Threshold Adjustment: 5-bit local adjustment per pixel, 35 e- rms after tuning
Applications
Where It Excels
- 01Medical X-ray and gamma-ray imaging
- 02Non-destructive testing and material analysis
- 03Color radiography and spectral imaging
- 04Neutron imaging and diffraction analysis
- 05Space radiation detection and astrophysics
- 06Security scanning and radiation safety monitoring
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