QHYCCD QHY411 Manual

Overview
The QHY411/461 has both USB3.0 and 2*10GigaE interfaces. The 2*10GigaE version supports a higher readout speed.
QHY411/QHY461 have both mono and color version. The application of this camera includes astronomy imaging, astronomy
photography, space object survey, satellite tracking, etc.
Benefiting from its back-illuminated pixel structure, the QHY411 has a large full well of 80ke-. And when using 2 * 2 binning,
the full well can reach 320ke-, corresponding to a merged pixel size of 7.5um * 7.5um; while at 3 * 3 binning, the full well can
be up to 720ke- with a large pixel size of 11um * 11um, which is much larger than any other CCD or CMOS sensor of the same
pixel size. Combined with the low readout noise, the camera has a large dynamic range advantage.
Native 16 bit A/D: The new Sony sensor has native 16-bit A/D on-chip. The output is real 16-bits with 65536 levels.
Compared to 12-bit and 14-bit A/D, a 16-bit A/D yields higher sample resolution and the system gain will be less than 1e-
/ADU with no sample error noise and very low read noise.
BSI: One benefit of the back-illuminated CMOS structure is improved full well capacity. This is particularly helpful for sensors
with small pixels. In a typical front-illuminated sensor, photons from the target entering the photosensitive layer of the
sensor must first pass through the metal wiring that is embedded just above the photosensitive layer. The wiring structure
reflects some of the photons and reduces the efficiency of the sensor. In the back- illuminated sensor the light is allowed to
enter the photosensitive surface from the reverse side. In this case the sensor's embedded wiring structure is below the
photosensitive layer. As a result, more incoming photons strike the photosensitive layer and more electrons are generated
and captured in the pixel well. This ratio of photon to electron production is called quantum efficiency. The higher the
quantum efficiency the more efficient the sensor is at converting photons to electrons and hence the more sensitive the
sensor is to capturing an image of something dim.
Zero Amplify Glow: This is also a zero amplifer glow camera.
TRUE RAW Data: In the DSLR implementation there is a RAW image output, but typically it is not completely RAW. Some
evidence of noise reduction and hot pixel removal is still visible on close inspection. This can have a negative effect on the
image for astronomy such as the "star eater" effect. However, QHY Cameras offer TRUE RAW IMAGE OUTPUT and produces
an image comprised of the original signal only, thereby maintaining the maximum flexibility for post-acquisition
astronomical image processing programs and other scientific imaging applications.
Anti-Dew Technology: Based on almost 20-year cooled camera design experience, The QHY cooled camera has implemented
the fully dew control solutions. The optic window has built-in dew heater and the chamber is protected from internal
humidity condensation. An electric heating board for the chamber window can prevent the formation of dew and the sensor
itself is kept dry with our silicon gel tube socket design for control of humidity within the sensor chamber.
Cooling: In addition to dual stage TE cooling, QHYCCD implements proprietary technology in hardware to control the dark
current noise.
Advanced Functions
Reboot the camera by power off and on