QHY990 Features
- The QHY990 camera features scientific short-wavelength infrared Sony InGaAs sensors with a quantum efficiency of up to 77% at 1200nm.
- Pixel size and array of 5.0um and 1392 x 1052 (1296 x 1032 effective) respectively
- 1.3mp resolution
- 12 bit ADC
- Sensor full capacity is measured at 112ke-
- Exposure range of 30μs to to 300 seconds.
- These Sony IMX990 covers a wide wavelength range from 0.4μm to 1.7μm and offer high sensitivity.
- Utilizing Cu-Cu interconnect technology, the sensors have very low fixed-pattern noise and a minimal defect pixel ratio.
- SWIR sensors can detect wavelengths typically unseen by standard sensors, enabling observations of distant galaxies and penetration through cosmic dust.
- Due to the higher dark current of SWIR InGaAs sensors, effective cooling is essential; the QHY990 can achieve temperatures as low as -35°C below ambient, significantly reducing dark current with the TEC cooling system.
- USB 3.0 interface with 66 fps at 8 and 16 bit mode.
- 128MB DDR2 Memory Buffer
- 768lines, 81.8FPS@8BIT, 81.8FPS@16BIT, 480lines, 123.9FPS@8bit, 123.9FPS@16bit ROI frame rates
- The camera includes a 25mm filter holder for easy installation of a SWIR filter, featuring a 17.5mm C-mount backfocus.
- Backfocus length of 12.5mm
- Supports 1.25" C Mount with adapter.
Comparing QHY900, QHY900 Pro II and QHY991
| Model | QHY990 | QHY990Pro II | QHY991 |
| Image Sensor | Sony IMX990 InGaAs | Sony IMX990 InGaAs | Sony IMX991 InGaAs |
| Sensor Type | Mono Only | Mono Only | Mono Only |
| Pixel Size | 5.0μm*5.0μm | 5.0μm*5.0μm | 5.0μm*5.0μm |
| Effective Pixels | 1.3 Megapixels | 1.3 Megapixels | 0.4 Megapixels |
| Effective Image Area | 1/2 inch | 1/2 inch | 1/4 inch |
| Effective Pixel Area | 1296*1032 | 1296*1032 | 656*520 |
| Total Pixel Area | 1392*1052 | 1392*1052 | 752*520 |
| A/D | 12-bit A/D | 12-bit A/D | 12-bit A/D |
| Full Well Capacity (1x1, 2x2, 3x3) | Typical 112ke- | Typical 112ke- | Typical 112ke- |
| Read Noise |
The measured data is after Bias Frame FPN calibration. Typical 50e- at a middle gain Typical 20e- at high gain |
The measured data is after Bias Frame FPN calibration.
Typical 150 e- at lowest gain Typical 50e- at a middle gain Typical 20e- at high gain |
The measured data is after Bias Frame FPN calibration. Typical 50e- at a middle gain Typical 20e- at high gain |
| Dark Current | 64.6e-/pixel/sec @-30℃ Gain0 5.41e-/pixel/sec @-30℃ Gain250 |
64.6e-/pixel/sec @-30℃ Gain0 5.41e-/pixel/sec @-30℃ Gain250 |
64.6e-/pixel/sec @-30℃ Gain0 5.41e-/pixel/sec @-30℃ Gain250 |
| Exposure Time Range | 30μs-300sec | 30μs-300sec | 30μs-300sec |
| Shutter Type | Electronic Global Shutter | Electronic Global Shutter | Electronic Global Shutter |
| Computer Interface | USB3.0 |
1*USB3.0 Interface
2*10Gigabit Fiber Interfaces
2*CameraLink Interfaces (Pro II Version Only)
|
USB3.0 |
| Filter Wheel Interface | 4PIN QHYCCD CFW Port | 4PIN QHYCCD CFW Port | 4PIN QHYCCD CFW Port |
| Trigger Port | One Hardware Trig-In Socket (RCA type).Opto-isolated | One Hardware Trig-In Socket (RCA type).Opto-isolated | One Hardware Trig-In Socket (RCA type).Opto-isolated |
| Full Frame Rates |
USB3.0:
66FPS@8bit
66FPS@16bit
|
USB3.0: 66FPS@16bit
PCIE Mode: 66FPS@8bit 66FPS@16bit |
USB3.0: 123FPS@16bit |
| ROI Frame Rates |
USB3.0: 480lines, 123.9FPS@8bit, 123.9FPS@16bit |
USB3.0: 480lines, 123.9FPS@8bit, 123.9FPS@16bit
PCIE Mode: 768lines, 81.8FPS@8BIT, 81.8FPS@16BIT 480lines, 123.9FPS@8bit, 123.9FPS@16bit |
USB3.0: 256lines, 230FPS@8BIT, 230FPS@16BIT |
| Built-in Image Buffer | 128MB DDR2 Memory Buffer | 128MB DDR2 Memory Buffer | 128MB DDR2 Memory Buffer |
| Air Cooling System | Dual Stage TEC cooler: -35℃ below ambient (Test temperature 20℃) |
Dual Stage TEC cooler: -35℃ below ambient (Test temperature 20℃) |
|
| Liquid Cooling | Available. -45℃ below ambient with normal water; -60℃ to -80℃ with cold liquid. |
||
| Recommended Flow Rates | 1.6ml/s | ||
| Anti-Dew Heater | Available | Available | Available |
| Firmware/FPGA remote Upgrade | Available via Camera USB port | Available via Camera USB port | Available via Camera USB port |
| Optic Window Type | AR+AR High Quality Multi-Layer Anti-Reflection Coating | AR+AR High Quality Multi-Layer Anti-Reflection Coating | AR+AR High Quality Multi-Layer Anti-Reflection Coating |
| Back Focal Length | 12.5mm | 12.5mm | 12.5mm |
| Adapters | Support C_Mount,1.25inch (with adapter) Support D=25mm and D=25.4mm filter |
Support C_Mount,1.25inch (with adapter) Support D=25mm and D=25.4mm filter |
Support C_Mount,1.25inch (with adapter) Support D=25mm and D=25.4mm filter |
| Weight | 520g | About 1kg |
520g |
| Power |
40W/100% 10W/0% |
40W/100% 10W/0% |
24W/100% 1W/0% |
SWIR Sensitivity Range
The QHY990 camera comprises scientific short-wavelength infrared Sony InGaAs sensors, achieving a quantum efficiency of up to 77% at 1200nm. This sensors covers a wide wavelength range of 0.4μm to 1.7μm and offers high sensitivity. Utilizing Cu-Cu interconnect technology, the sensors exhibit very low fixed-pattern noise and a minimal defect pixel ratio.
For purposes of scientific observation and imaging, SWIR sensors can detect wavelengths that ordinarily wouldn't be seen in standard sensors, thus enabling more data from cosmic locations that emit these wavelength types such as distance galaxies and looking through cosmic dust.
AIR Cooling and Filter Holder
Because of the nature of SWIR InGaAs sensors have a higher than average dark current than regular sensors, it is pertinent to have adequate cooling. In the case of the QHY990, air cooling can bring temperature down to -35°C below ambient which is sufficient to reduce dark current.
The QHY990 camera comes with a 25mm filter holder to install a SWIR filter with a 17.5mm C-mount backfocus.
Sony IMX990 inGaAsSensor Metrics Chart
| ADC | 12-bit A/D |
|---|---|
| Includes Autoguide Port | No |
| Backfocus Distance | 12.5mm |
| Exposure Modes | 30μs-300sec |
| Frames Per Second (FPS) | 66FPS@8bit, 66FPS@16bit full frame rates |
| Full Well Capacity | Typical 112ke- |
| Image Stabilization | No |
| Pixel Array | 1296x1032 effective pixels |
| Pixel Size | 5.0μmx5.0μm |
| Resolution | 1.3mp |
| USB Port | USB3.0 |
| In The Box |
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