noise modeling using photon transfer...
TRANSCRIPT
Noise Modeling using Photon Transfer Curves
Thomas Rust MOSES Group Meeting
October 31, 2012
=G2!2 !P"i +G
2!F +" READ
2
= G !I "i # ped( )+G2F( )! +"
READ
2
!i
2=!
SHOT
2+!
FANO
2+!
READ
2
!I "i =G!!P"i + ped
!!!E,!
E<!Charge Collection Issues:
! i
2= G !I "i # ped( )+G2
F( )"E+!
READ
2
!I "i =G!!P"i + ped
Need to measure ! READ
2, ped,G,"E
!E =" EUV
2 !" READ
2
G "I #BOX ! ped( )+G2F
! BOX
2= G !I "BOX # ped( )+G2
F( )"E+!
READ
2+!
FIXED
2
!I "BOX =G!!P"BOX + ped
! dI ,BOX
2= G !I "BOX # ped( )+G2
F( )"E+!
READ
2
dI !I2" I
1
2
[e-/phot]
G =! RED
2 !! READ
2
"I # ! ped
! RED
2=G !I " # ped( )+!
READ
2
! > 400nm :
measured from bias images (dark current at room temp)
! READ
2, ped
[DN/e-]
G is temperature dependent.
Procedure
• Expose CCD’s to pulsed 635 nm LED • Vary exposure level from dark to A/D
saturation • Two images at each exposure level • Difference same exposure images • Compute for many locations on
CCD • Plot on log-log scale
!dI ,BOX
2, !I "
BOX
Results
1/G [e-/DN]
RMS Read Noise [e-]
Min Full Well
[ke-]
m = -1
6.23
13.00
95.7
m = 0
6.40
13.22
99.9
m = +1
6.25
14.08
98.1
TO DO
• Cooled (vacuum) red light photon transfer • Measure effective quantum yield in EUV
noise model • PTC – Flatfield Connection
Thanks
Pat Lokken Hans Jake Plovanic Charles Norm Bo Larry
References
• Janesick, J. (2001). Scientific Charge-Coupled Devices. SPIE Press.
• Janesick, J. (2007). SPIE Press. DN ! !.