The QHY991M is a scientific cooled short wavelength infrared (SWIR) camera featuring the Sony IMX991 InGaAs sensor with a square 5µm x 5µm pixel array and 0.4 million effective pixels. This chip has a wide waveband (0.4um-1.7um) with high sensitivity. QE is up to 77% at 1200nm. By using Cu-Cu interconnect technology, the sensor has very low fixed pattern noise and a low pixel defect ratio.

The QHY991M include a 25mm filter holder. The 25mm filter standard is common for lab applications. SWIR filters can easily be installed inside the camera with the included adapter, keeping the C-mount 17.5mm backfocus requirement.

The QHY991M is equipped with air cooling system that can reach -35C below ambient.

Typically the InGaAs sensor has a higher dark current than Silicon-based material. If you are doing long exposure imaging with this camera (eg. exposure >5 sec), QHYCCD recommends selecting the liquid cooling version.

Sony's SWIR image sensor technology is used to make the top InP layer, which absorbs visible light, thinner, making it possible to transmit light to the InGaAs layer underneath, delivering high quantum efficiency even in the visible range. This design enables imaging in a broad range of wavelengths from 0.4μm to 1.7μm, enabling the use of a single camera instead of the conventional multiple that were required to capture visible light and SWIR.

Applications: SWIR Astronomy Imaging and Photometry, Daytime Star Observing, Optical Communication, Optic Labs.

Specifications

Sensor	Sony IMX991 SWIR sensor
Resolution	0.4 Megapixels 752 x 520 (with optic black area)
Pixel size	5.0 x 5.0 µm
Sensor size	1/4 inch
Quantum efficiency	>77% @ 1200 nm
Read noise	135e- after Bias Frame FPN calibration
Full well capacity	120,000 e-
Bit rate	12 bit ADC
Frame rate	123 FPS @ full resolution (8 bit and 16 bit)
Shutter type	Electronic global shutter
Cooling	ΔT of 55°C (air cooled)
Ports	USB 3.0
Back focus	12.5 mm
Connections	C-mount, 1.25" adapter, flange with 6 x M3 screws
Trig function	Hardware Trig-In socket (RCA type), opto-isolated

ROI Frame Rate

1080lines	83 FPS @ 8-bit - 56 FPS @ 8-bit
768 lines (USB 3.0)	110 FPS @ 8-bit - 75 FPS @ 8-bit
480 lines (USB 3.0)	158 FPS @ 8 bit - 110FPS @ 16 bit

Downloads

Guide to installing QHY and ASCOM drivers for QHYCCD cameras.

QHY camera drivers (TBD)

QHY 990 manual (TBD)

Gallery

QHY990 Sample Image in daytime. 16mm F1.4 SWIR lens @F2.8, 1200-1800nm filter. Gain=0, exposure time = 1.3ms.

QHY990 Sample image under sky (at night). 16mm F1.4 SWIR lens @F1.4, 1200-1800nm filter. Exposure = 2sec, stack of 29 frames, -11C sensor temperature. Dark frame calibrated.

QHY SCIENTIFIC CAMERAS