September, 2021
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market. Its latest SWIR-based technology leverages many of its previous technologies developed for CCDs and CMOS sensors. It is the world’s first, non-military based, CMOS-like sensor to cap- ture in both the visible and SWIR wavelength ranges. Sony’s current offering is an
InGaAs based sensor for the light gathering portion that is stacked on top of a silicon (Si) backend for the readout and con- trolling electronics, and memory. Connection between the InGaAs and Si layer is by copper-to-cop- per bonding. The resulting image sensor
is a bridge between the visible, NIR and SWIR wavelengths, with a spectral response between 0.4 and 1.7µ. This means that only one sensor or camera is needed for applications that require data in this range. This greatly simplifies the
vision system design and image analysis, as images do not need to be compared and aligned. Sony has created two SWIR- based sensors, the IMX990 and IMX991. Housed in ceramic, the new devices enable a greatly reduced pixel size, offer level quantum efficiency, have global shutters, and output data through SLVS transceivers.
Target Applications Machine Vision (MV) appli-
cations have long used various sensors to capture images at dif- ferent wavelengths. In theory, this market has a lot of multi- spectral imaging applications. However, the cost of having mul- tiple cameras and the higher price points of non-visible wave- length cameras make them pro- hibitive to use on a regular basis. Cameras built with Sony’s
SWIR sensors have the advan- tage of being used to visually record temperature differences. As the SWIR range touches the thermal wavelength range, the camera can detect differences in temperature and present them as intensity values in the captured images. For example, this allows the use of cameras and machine vision applications to monitor temperature of soldering irons to determine if they have reached their ideal temperature for use. With more autonomous
vehicles being developed and deployed, the need to overcome environmental challenges is increasing. One of the biggest challenges with these applica- tions is fog, mist and haze that obscures the view from the cam- era. SWIR wavelengths can pass through these obstructions pro- viding better views for the navi- gation systems to direct the vehi- cle and avoid collisions with other objects.
Water absorbs SWIR waves
very well. This is an important property when checking to see if materials have penetrated or contain water. SWIR images will be darker where the moisture is present and MV algorithms can react accordingly. Many applications have
benefited from a large spectrum of wavelengths to gather addi- tional information and make assessments of a product’s quali- ty and performance. Costs of SWIR based cameras have limit- ed how effectively they are deployed in these verticals.
With the introduction of
Page 59
Using NIR and SWIR Light in Machine Vision Applications Continued from previous page
Sony’s SenSWIR™ technology and image sensors, the company
has opened up these markets by providing a low-cost solution that spans a broad range of wavelengths. This minimizes the complex-
ity of the vision system’s design while providing hyperspectral and multi-spectral imaging to the masses. Contact: FRAMOS
Sony’s IMX991 with and without TEC.
Technologies, Inc., 2733 Lancaster Road, Suite 210, Ottawa, Ontario, Canada, K1B 0A9 % 613-686-1152 E-mail:
webpage-us@framos.com Web:
www.framos.com r
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