Fpp ccd camera performance
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FPP CCD Camera Performance. Ted Tarbell 17-Apr-2006. FPP CCD Detectors. FG CCD. FG: 4096 x 2048 pixels, thinned, back-illuminated SP: two 24 x 1024 on the same chip, front-illuminated CT: 50 x 50, front-illuminated All have 12 micron square pixels. CT CCD. SP CCD. FPP CCD Cameras.

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FPP CCD Camera Performance

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Fpp ccd camera performance

FPP CCD Camera Performance

Ted Tarbell

17-Apr-2006


Fpp ccd detectors

FPP CCD Detectors

FG CCD

  • FG: 4096 x 2048 pixels, thinned, back-illuminated

  • SP: two 24 x 1024 on the same chip, front-illuminated

  • CT: 50 x 50, front-illuminated

  • All have 12 micron square pixels

CT CCD

SP CCD


Fpp ccd cameras

FPP CCD Cameras

  • All cameras:

    • Low power, radiation resistant, cooled electronics boxes

    • 2.5 Mega-pixels/sec readout rate, with 12-bit A-D conversion

    • SP & FG detectors are cooled, CT at room temperature

  • FG Camera

    • On-chip summing of 1x1, 2x2 or 4x4 pixels

    • Full frame readout in 3.75 sec (1x1) or 1.9 sec (2x2)

    • Full frame exposure with shutter or partial frame continuous exposure in shutterless frame transfer mode

  • SP Camera

    • Continuous exposure, shutterless frame transfer mode

    • 112 spectral x 1024 spatial pixels on each of 2 detectors

    • On-chip summing of 1x2 pixels possible (spatial summing)


Linearity noise from light transfer

Linearity & Noise from Light Transfer

Linearity Plot

  • Average intensity vs. exposure time for a constant source

  • There is an electronic offset at exposure time = 0

Noise Plot

  • Noise-squared vs. average intensity

  • Straight line for an ideal camera

  • Slope is square-root-of-N noise

  • Value at electronic offset = read noise


Fg gains read noise levels

FG Gains & Read Noise Levels

Results from FPP Thermal/Vacuum Test, 27 Mar 2004

FG CCD –32 C SP CEB +5 C Darks


Sp gains read noise levels

SP Gains & Read Noise Levels

Results from FPP Thermal/Vacuum Test, 8 April 2004

SP CCD –38 C SP CEB 0 C Darks


Ct gains read noise levels

CT Gains & Read Noise Levels

Results from CT CEB Checkout, 26 Nov 2003

Room Temperature Light Transfer Curves


Fg sp have additional adc noise

FG & SP have Additional “ADC” Noise

Before Repair

After Repair


Dark current in fg camera

Dark Current in FG Camera

  • Dark Current is not measurable below about -30 deg C and is negligible below about 0 deg C

  • Read noise does not depend on temperature


Orbital temperature variation

Orbital Temperature Variation


Conclusions

Conclusions

  • Developing these cameras to meet the requirements of high readout rate, low noise, excellent linearity, low power, and radiation tolerance was a significant challenge

  • FG and SP have ADC noise, and SP has more readout noise than desired

  • Nevertheless, they meet their fundamental noise requirements

    • SP: 1000:1 polarimetric SNR in normal mode

    • FG: 200:1 SNR in single images, 500:1 pol. SNR in normal mode

    • CT: < 0.005 arcsecond rms error per axis in image displacement

  • The FG and SP cameras will be cold enough that dark current will be negligible


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