QHY Cooled Small Size CMOS Cameras QHY174 (GPS) / 178 / 224 / 290
The QHYCCD Small "COLDMOS" camera series includes all cooled cameras with BSI (back-illuminated) and FSI (front-illuminated) CMOS sensors in optical format sizes smaller than 1 inch. These same sensors are also used in the uncooled QHY5III Series cameras.
However, as the name implies, the Small COLDMOS camera models include efficient TE cooling as well as other more advanced features not found on the uncooled models::
- USB 3.0
- Regulated TE Cooling Delta -40C
- 128 MB DDR Frame Buffer
- ST-4 Compatible Guide Port
- Filter Wheel Port
- Anti-Noise Technology
- Anti-Amp Glow Technology
- Anti-Dew Technology
These additional features include a heated optical window to prevent external dew, a desiccant plug socket to help maintain a frost-free CMOS chamber, a 128MB frame buffer, a filter wheel port, and in the case of the QHY174M-GPS (Selected by the NASA New Horizon Team), an optional GPS timing module for highly accurate time stamping on individual frames.
The QHY174M-GPS camera is the same as the QHY174M but with the addition of an optional GPS based precision time and location function, useful for imaging occultations, eclipses, meteors, and other scientific imaging requiring a highly precise recording of the time and location of the observation on every frame. The QHY174M-GPS has dual stage TE cooling to -45C below ambient with full antimoisture control.
The QHY174 also has an anti-amp glow function. It can reduce the IMX174 sensor's amplifier glow significantly in long exposures. The IMX174 (GPS) sensor has a global shutter and is capable of high frame rates, both ideal features for a time-domain imaging camera. The QHY174M-GPS will record the global shutter exposure starting and ending time with microsecond precision. Two QHY174 cameras, for example, each located anywhere in the world, can have the same time base, accurate to microseconds. In order to guarantee the starting and ending time of the exposure, the QHY174 has a built-in LED pulse calibration circuit precise to 1 microsecond.
The QHY174 camera is designed to be an excellent planetary, lunar, solar and meteor capture video camera. With a 50mm F1.4 lens it will record mag 8 to mag 9 stars in live video recording at 30FPS (33ms exposure), several magnitudes fainter than can typically be seen with the naked eye.
Master mode: In Master Mode, the camera is free running and the internal 10MHz GPS synced clock will measure and record the shutter's opening and closing time. Slave mode: In Slave Mode you can input a target start time and the interval period for two frames. For example: You want three cameras in different locations (maybe thousands of kilometers apart) to start an exposure at 2016.3.9.UTC 14:00:00.000000 and then to continue with exposures at the interval time of 0.100000 sec. After you input these values, all the three cameras will wait until this time and then simultaneously start video recording. The time stamp and other GPS information is embedded into the image. The software decodes it in real time and displays the information on left. Since the data is embedded, it will never be lost so long as you keep the original image.
An Independent detailed review of the QHY174 camera can be found at:
Information on the QHY Anti-amp glow feature can be found here:
Dual-stage TE cooling reduces the sensor temperature to -40C or more below ambient and temperature regulation maintains a constant temperature set point. Due to the efficient TE cooling, single exposure times up to 30 minutes are possible on most models, making them suitable for deep space imaging of dim objects as well as brighter objects and planets.
All of the Small COLDMOS cameras use Sony Exmor CMOS sensors. Two models, the QHY178 and QHY290, use Sony STARVIS Exmore R back-illuminated sensors. STARVIS is Sony’s designation for sensors capable of recording under starlight. These sensors have improved sensitivity and noise reduction - the key factors to enhancing image quality, while radically realigning their fundamental pixel structure from front-illumination to back-illumination. It retains the advantages of CMOS image sensors such as low power consumption and high-speed operation while dramatically improving sensitivity. With a conventional front-illumination structure, the metal wiring and transistors on the surface of the silicon substrate that form the sensor's lightsensitive area (photo-diode) impede photon gathering carried out by the on-chip lens, and this has also been an important issue in the miniaturization of pixels and widening optical angle response.
Further detail information can be found on the original webpage of QHYCCD :
If you have any further questions, please send us an email to kontakt (at) baader-planetarium.de.
Please note the additional details on the Tab "Downloads"
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