Glossary of Terms
102
UV Overcoating (Enhancement)
The depth of penetration into silicon is very shallow for UV light. With this shallow
penetration, the probability of a UV photon penetrating to the depletion zone is less
than for longer wavelength photons. Thus the QE is lower in the UV than in the
visible and NIR region. By coating the chip with a fluorescent dye that converts UV
light to longer wavelengths, the probability of photon detection is increased. Lumigen
is a phosphor coating used for UV enhancement.
Variable Gain
Variable Gain is the ability to match the range of the ADC to the usually larger range
of the CCD without losing valuable information.
Signal can be extracted from the noise baseline by statistical treatment. Oversampling
of this noise will make this extraction more accurate, so the gain can be electronically
adjusted to quantize this small signal at high resolution, typically 1 or 2 electrons per
count. Since stronger signals saturate the ADC quicker, low electrons per count is
considered high gain (a small signal produces a large response).
Conversely, large optical signals can tax the full dynamic range available on the chip,
which may be in excess of the ADC dynamic range. In this case, a lower gain of
typically 7 – 18 electrons per count will report a smaller count value versus a high
gain setting, and allow the range of the ADC to cover the maximum charge of the
CCD. Statistical information in the baseline is generally not the limiting factor of an
acquisition with full range signals present, and thus can be traded off without penalty.
X Binning
X Binning is the combining of columns of pixels to form a single data point. By
combining columns, a greater signal level can be detected; however, this results in a
decrease in resolution. See Binning.
Y Binning
Y Binning is the combining of rows of pixels to form a single data point. By
combining rows, a greater signal level can be detected; however, this results in a
decrease in resolution. See Binning.
Summary of Contents for JOBIN YVON SYNAPSE
Page 1: ...SYNAPSE CCD Detection System User Manual Part Number 81100 Revision 2...
Page 10: ...Preface x...
Page 14: ...System Description and Specifications 4...
Page 28: ...Detector System Installation 18...
Page 38: ...Initial Power up and Operation 28...
Page 48: ...Temperature Control 38...
Page 72: ...Appendix A Dimensional Drawings 62 Figure 17 Distance from Focal Plane to CCD Chip...
Page 73: ...Appendix A Dimensional Drawings 63 Figure 18 Synapse Power Supply Unit...
Page 74: ...Appendix A Dimensional Drawings 64...
Page 86: ...Appendix C Performing Routine Procedures with SynerJY 76...
Page 100: ...Appendix E Accessories 90...
Page 104: ...Warranty 94...
Page 113: ...103 Notes...
Page 114: ...104 Notes...