Specifications
25
Prosilica GC Technical Manual V2.2.2
Resolution and ROI frame rate
This section charts the resulting frame rate from changing sensor height from full
image to a single line. Unless otherwise noted, sensors do not give an increase in
readout speed with a reduction in width.
Absolute quantum efficiency plots
Resolution and ROI measurements
•
Data was generated using
StreamBytesPerSecond
= 124 Mbit/s (full
bandwidth) and an 8-bit pixel format. Frame rates may be lower if using
network hardware incapable of 124 Mbit/s.
•
ROIs are taken as center image for maximum speed advantage, where feature
OffsetY
= (full sensor height – ROI height)/2.
•
BinningVertical
is horizontal row summing on CCD before readout. The
frame rate for an ROI at the same effective height as binning is slower because
the CCD still needs to read out the “fast readout rows” in ROI mode.
Frame rate and readout
Although the sensor is capable of higher frame rates, readout is limited by GigE
bandwidth and exposure value. You can improve frame rates with a reduced
region of interest and shorter exposure values.
Important notice before reading the quantum efficiency plots
All measurements were done without protection glass or IR cut filter. With
protection glass or filters, quantum efficiency (QE) decreases by approximately
10%.
The uncertainty in measurement of the QE values is
10.25%.
This is mainly due to uncertainties in the measuring apparatus itself (Ulbricht
sphere, optometer, etc.
Manufacturing tolerance of the sensor increases overall uncertainty.
Absolute QE plots for Sony CCD/CMOS sensors
Sony provides relative response curves in their sensor data sheets. To create the
absolute QE plots shown in this chapter, the relative response was converted to a
normalized QE response and then adjusted as per three measured QE values (@
448 nm, 529 nm, 632 nm) for color sensors and one measured QE value (@ 529
nm) for monochrome sensors.
Absolute QE plots for ON Semiconductor CCD sensors
The curves in the absolute QE plots shown in this chapter are from the sensor
manufacturer data sheet.
The information was correct at the time of publishing. Sensor specifications may
change without notice.
