Fast-frame imager

  • The Fast-frame imager consists of two sCMOS Andor Zyla 5.5 cameras, installed at the prime focus of the telescope, offering the ability to record a target simultaneously in two different wavelength bands. A dichroic with a cut-off at 730 nm splits the light beam, sending each split beam to a different camera. The cameras are equipped with R and I-band Johnson-Cousins filters.

 

 

 

 

 

 

Model
Andor Zyla 5.5
Type of sensor
Front Illuminated Scientific CMOS
Shutter options
i) Global
ii) Rolling
Gain settings options
i) High well capacity (12bit)
ii) Low noise (12 bit)
iii) Low noise & High well capacity (16 bit)
Read out rate options
i) 560 MHz
ii) 200 MHz
Sensor size (mm)
16.6x14.0
Pixel size (μm)
6.48
Total pixels
2560x2160
Field of view (arcmin)
16.60x14.04
Pixel scale (arcsec/pixel)
0.4
Maximum frame rate
40 fps
Maximum exposure time
30 sec
Linearity
< 60,000 ADUs (16-bit); <4,000 ADUs (12-bit)
Cooling
Thermoelectrical (constant at 0 degrees)
Connection
USB 3.0


Gain (Sensitivity) and Read out noise for each mode

Rolling Shutter
Global Shutter
System RO rate
Gain settings
CMOS Sensitivity
(e- per A/D count)
Median Read| Noise
(e- RMS)
CMOS Sensitivity
(e- per A/D count)
Median Read Noise
(e- RMS)
560 MHz
High well capacity (12bit)
7.53
6.62
7.59
7.06
Low noise (12 bit)
0.30
1.39
0.42
2.58
Low noise & High well capacity (16 bit)
0.47
1.41
0.47
2.62
200 MHz
High well capacity (12bit)
7.40
6.93
7.73
6.59
Low noise (12 bit)
0.30
1.19
0.42
2.45
Low noise & High well capacity (16 bit)
0.45
1.15
0.46
2.51

 

  • The performance of the Prime Focus Instrument optical system (dichroic, filters, cameras) is calculated taking into account the Quantum Efficiency (QE; black solid line) of the cameras, the transmittance of the R and I filters (red dotted and grey dotted lines respectively) and the dichroic (brown solid line). The final output is shown by the red and grey solid lines.