QHY991 Scientific CMOS Camera
The new QHY991 camera is a cooled, short wavelength infrared camera that sports Sony's IMX991 InGaAs sensor with an amazing 5μm pixel array! This sensor has 0.4 megapixels and a wide band response (0.4μm-1.7μm), along with high sensitivity. With Cu-Cu interconnect technology, the IMX991 sensor has a very low FPN noise and low defect pixel ratio.
The QHY991 comes with a 25mm filter holder, which is a common filter size for most laboratory applications. The SWIR (Short Wavelength Infrared) filter can be easily inside the camera. With this adapter, the camera has the standard 17.5mm C-mount back focal distance.
There are both air cooling and liquid cooling options available for the QHY991 camera. With the air cooling method, the camera can achieve a delta of -35C degrees below ambient temperature. Alternatively, with room temperature liquid cooling, a delta of -45C degrees below ambient is achieved and with chilled liquid you can reach a delta of -60C to -80C below ambient! The liquid cooling version of this camera is recommended for applications that would require exposures to be longer than 5 seconds or more.
IMX991 InGaAs Sensor
The QHY991 camera is fitted with Sony's original SenSWIR technology, where photodiodes are formed on an indium gallium arsenide (InGaAs) compound semiconductor layer. These photodiodes are connected via Cu-Cu connection with the silicon (Si) layer, which forms the readout circuit. This design enables high sensitivity over a broad range of wavelengths. All of this results in a SWIR image sensor that is both compact and capable of delivering seamless image capture over a broad range of wavelengths, covering from the visible to invisible light spectrum in the short-wavelength infrared range (0.4μm to 1.7μm). This technology is especially important because it is able to sense even in wavelengths that are not visible to the human eye, which makes the development of cameras and testing equipment for various applications possible, while also contributing to the development of diversifying industrial equipment.
Left: Ceramic LGA Package
Right: Ceramic PGA package with built-in thermoelectric cooling
Sony's new sensors employ stacking technology using Cu-Cu connection that has been developed by Sony for years, along with Sony's original SWIR image sensor technology. This leads to high image quality and a more compact sensor size (thank you miniaturization!) as well as high sensitivity imaging in a broad range of wavelengths that cover both the visible and invisible spectrums. This is particularly useful due to the recent demand to reduce manpower and ensure standardization in the industrial equipment field, where sensors capable of capturing images in the invisible light spectrum of the short-wavelength infrared range is a must. The IMX990 also supports digital output, which matches the performance of current CMOS image sensors for industrial equipment.
When bonding the InGaAs layer that forms the light receiving photodiodes and the Si layer that forms the readout circuit, using conventional bump connections makes it necessary to secure a particular bump pitch. This makes it difficult to achieve a smaller pixel size compared to current CMOS industrial CMOS sensors. Therefore, miniaturization has been a major challenge. Sony's new sensors feature a smaller pixel pitch that is made possible by the Cu-Cu connection, resulting in the industry's smallest 5μm pixel size. In turn, it is possible to reduce camera size while maintaining VGA resolution, which contributes to improved testing precision.
Left: Bump Connection ; Right: Cu-Cu Connection
SWIR Image Sensor Technology
Sony's original SWIR (Short Wavelength Infrared) image sensor technology is employed to make the top InP layer, which absorbs visible light thinner, making it possible to transmit light to the InGaAs layer underneath. This process delivers high quantum efficiency, even in the visible range. This particular design enable imaging in a broad range of wavelengths from 0.4μm to 1.7μm, enabling the use of a single camera rather than the conventional multiple that were required to capture visible light and SWIR. /this leads to lower system costs and faster speeds, thanks to the reduced image processing load, allowing for a dramatic expansion in testing range.
While conventional SWIR image sensors usually have analog output, the IMX991 supports digital output and deliver the same performance as current industrial CMOS image sensors. Analog output sensors typically require a digital conversion circuit or other functionality for industrial equipment on the camera, but the IMX991 has this technology built in. This reduces the number of steps in camera development, making multifunction camera development easier than ever!
||IMX991 SWIR Sensor
||5.0um x 5.0um
||752 x 520 (Including optically black pixels)
|Effective Pixel Area
||656 x 520
|Effective Image Area
|AD Sample Depth
||Electric Global Shutter
||77% @ 1200nm
||120ke - typical
|Typical Read Noise
- 20e @ High Gain
- 50e @ Med Gain
- 150e @ Low Gain
- 133 FPS @ Full Resolution 12-bit
- 254 FPS @ 240 Lines 12-bit
- 510 FPS @ 100 Lines 12-bit
- 700 FPS @ 40 Lines 12-bit
- 830 FPS @20 Lines 12-bit
||Hardware Trig-In Socket (RCA type) Opto-isolated
||Dual Stage TE Cooler
- -35C below ambient w/ air cooling
- -45C below ambient w/ room temp liquid cooling
- -60C to -80C below ambient w/ chilled liquid cooling
Flange w/ 6-M3 screw holes
Supports D=25mm and D=25.4mm filters
|Back Focal Length
C-Mount, 1.25" adapter
- 17.5mm with filter adapter
- 14.5mm without filter adapter
- 12.5mm with basic interface
Visualize the Specs
NOTE: Images say QHY990 but are also applicable to the QHY991 camera