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QHY2020 Scientific Cooled CMOS Camera
with 94% QE
The QHY2020 uses a GSENSE2020BSI back-illuminated (BSI) scientific CMOS image sensor with 4MP resolution and 6.5μm pixel size. With six-transistor (6T) pixel architecture, GSENSE2020BSI features readout noise of 1.6e-, full well of 54ke-, as well as peak QE of 94%. In addition, the sensor supports correlated multiple sampling (CMS), the read noise can be further reduced to 1.2e- with 2-CMS operation. The GSENSE2020BSI is offered in two variations: -H and -M. -H has better MTF and higher Full well capacity, while -M has lower dark current. Both versions will be in mass production.

GSENSE2020BSI has the dual ADC structure. The two ADCs will sample the same signal at the same time and generate two images. One image has low gain, big dynamic, another image has high gain, low readout noise. With this step it can generate the HDR image to enhance the dynamic range. The following picture is the dual ADC output images generated by QHY2020. The left is the low gain channel and the right is the high gain channel.Its resolution is 4096*2048 which consists with two 2048*2048 images.

The following picture is a dark frame of 60sec exposure, @ -20C sensor temperature. You will see a little ampilifer glow on the corner of the image. But it should be easy to be removed with dark frame calibration.  Please note this is a CLASS 2 sensor. So you will see a defect row in this image.  QHY2020 has both Class 1 sensor version and Class 2 sensor version. The price is different. 


The following picture is a 10sec exposure dark frame under -20C degree cooling, with background level stretch. Class 2 sensor.

But if you do not want to use the dual gain image. The SDK of QHY2020 also support a function to only output one channel. in the SDK, by following function. Please consulting the QHYCCD software engineer that how to use it.

EXPORTC uint32_t STDCALL GetQHYCCDNumberOfReadModes(qhyccd_handle *h,uint32_t *numModes);
// Get the maximum resolution for a read mode
EXPORTC uint32_t STDCALL GetQHYCCDReadModeResolution(qhyccd_handle *h,uint32_t modeNumber, uint32_t* width, uint32_t* height);
// Get the name of a read mode
EXPORTC uint32_t STDCALL GetQHYCCDReadModeName(qhyccd_handle *h,uint32_t modeNumber, char* name);
// Set the read mode
EXPORTC uint32_t STDCALL SetQHYCCDReadMode(qhyccd_handle *h,uint32_t modeNumber);
// Get the read mode
EXPORTC uint32_t STDCALL GetQHYCCDReadMode(qhyccd_handle *h,uint32_t* modeNumber);

New SharpCAP version 3.2.5986.0 support the multiple ReadMode of the QHYCCD scientific camera. For example. QHY2020,QHY42PRO has both HDR mode and STD mode. HDR mode consists two gain channel. The two image will combine into one image to output . Left is low gain and right is high gain channel. 

QHY2020 supports multiple CMOS driver clock. The difference clock will cause different frame rate. But also effect the performance, like the readout noise, FPN noise (espeically the vertical FPN noise). So please select the suitable clock rate for your applications. QHYCCD does not gurantee all the clock is perfect in the performance.


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