CCD with USB 3.0 cameras - xiD line¶
1: What were the conditions of testing/measurements that XIMEA did with xiD models ?¶
Temperature of environment: 24°C
Temperature of sensor: 35°C
Reading frequency (slow readout/fast readout etc.): 26/52/65MHz
Channels of readout: 1/2/4 TAP readout
Maximum dT between sensor and camera housing: 20°C (uncooled camera)
Total readout noise (photon transfer function):
conversion factor (gain): 0.68
e/ADU (analogue digital units): 0.74
e-/uV: 0.82 e-/ADU
Bias (offset): Compensated in AFE
Total readout noise: 7.2 / 8.8 / 9.7 e- (readout 26/52/65MHz)
Saturation/full well capacity: 20ke typical
Maximum linearity error: <1%
2: Will the measurement for dark current be added anytime soon?¶
Dark current is mostly compensated by AFE so it is almost impossible to measure it.
What we have measured is ~10^-12 ADU/s
It may be possible to calculate it from saturation level, however this will contain leak as well.
3: What is maximum framerate of MD028 at 640x480, 1024x768, 1600x1200 for 8 bits, with 1x1 binning (or no binning). Will there be any effect of cooling on max framerate?¶
ROI feature (Region of interest) is increasing speed only proportionally to the height of full resolution - width does not have any influence.
It also has to be vertically centered.
So for 4TAP, binning 1x1, 52MHz readout the frame rates are approximately:
1936 x 480 – 159 fps
1936 x 768 – 102fps
1936 x 1200 – 67fps
4: Is there a digital input that can be read with each frame and passed back in the frame header/metadata? If I am trying to capture system state information with each acquired frame.¶
All IO's are sampled at the beginning of image transfer. Meaning 2 in and 2 out.
5: What is the pinout for the connectors.¶
Connector pinout depends on camera, delivery board level has two connectors for IO. In housing there is only one.
6: Are Sony CCD sensors (2.8, 6.1, 9 and 12 MP) available in taped glass versions?¶
Unfortunately, Sony sensors are not available with taped glass. Customers can try to remove it on their own risk.
7: What will be the longest exposure time (cooled / uncooled).¶
Exposure value depends on readout mode now it is for example 305s on MD028 model.
From API version 4.1.70 the camera will be able in 1 TAP mode to reach exposition: 713s.
8: Is there a difference in the frame rate between 12 and 14 bit image acquisition / different packed modes?¶
All transfers are still 16bit so there is no difference for 8bit mode.
9: Where can I find a table with the frame rates for all implemented modes for all sensors (4-tap readout)?¶
It will be provided in camera specification.
10: Is binning mode 3x3 available (sensor and camera)?¶
Yes, this binning mode is supported and implemented.
11: Is there ROI restriction as with the CMOSIS sensor cameras? (i.e., the sensor will only allow ROIs in vertical direction) Will the speed increase proportionally to the number of lines or the area?¶
With CCD sensors, in general, the horizontal ROI (Region of interest) will not increase the speed.
Vertical ROI will improve speed, but it has also restrictions for the Region of interest, which has to be close to the middle of the frame.
12: What is the range for electronic gain (not numeric but electronic gain) for the models?¶
Driver and API are the same.
However, testing may be advised as there are several controls different from xiQ.
14: Can the announced value 60 fps at full resolution (2.8 Mpix) be increased even higher ?¶
Speed of 60fps has been measured, however now it is possible to get 67fps in overlock mode (65Mhz).
In the future the plan is to go over 70fps in overclock mode 12bits.
Readout noise is similar for all modes. The only difference is the number of TAPs.
15: For long exposure it's necessary to be sure to have no light leakage on the sensor if a LED is used at the rear of the camera. How is this handled ?¶
Sensor is properly shielded from camera LED indication.
However for longer exposures it is wise to turn them off.
16: Other useful features would be to have a silica gel chamber to prevent humidity inside camera and a way to reduce dew on the clear window in front of the sensor. Are these planned or not ?¶
Cooled cameras will have different atmosphere – not air, but inert gas so there will not be any humidity and therefor no condensate.
17: What USB3 cable I need to use for MD091 and MD120 models ?¶
These cameras require more power than cameras with smaller resolution. In order to deliver expected current - use cables with small resistance (e.g. short or good quality).
To check if cable has acceptable resistance - please use our diagnostic application xiCOP