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Measurement of camera image sensor depletion thickness with cosmic rays | | J. Vandenbroucke
; S. BenZvi
; S. Bravo
; K. Jensen
; P. Karn
; M. Meehan
; J. Peacock
; M. Plewa
; T. Ruggles
; M. Santander
; D. Schultz
; A. L. Simons
; D. Tosi
; | | Date: |
30 Oct 2015 | | Abstract: | Camera image sensors can be used to detect ionizing radiation in addition to
optical photons. In particular, cosmic-ray muons are detected as long, straight
tracks passing through multiple pixels. The distribution of track lengths can
be related to the thickness of the active (depleted) region of the camera image
sensor through the known angular distribution of muons at sea level. We use a
sample of cosmic-ray muon tracks recorded by the Distributed Electronic
Cosmic-ray Observatory to measure the thickness of the depletion region of the
camera image sensor in a commercial smart phone, the HTC Wildfire S. The track
length distribution prefers a cosmic-ray muon angular distribution over an
isotropic distribution. Allowing either distribution, we measure the depletion
thickness to be between 13.9~$mu$m and 27.7~$mu$m. The same method can be
applied to additional models of image sensor. Once measured, the thickness can
be used to convert track length to incident polar angle on a per-event basis.
Combined with a determination of the incident azimuthal angle directly from the
track orientation in the sensor plane, this enables direction reconstruction of
individual cosmic-ray events. | | Source: | arXiv, 1511.0660 | | Services: | Forum | Review | PDF | Favorites | |
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