Sensor Technology
Figure 4. The image at right was scanned using an image sensor that integrates Nyxel technology. The difference is “like night and day” compared to the non-Nyxel scan at left.
Figure 3. The FSI GS pixel has a lens aperture limit within F2.0 while the BSI GS pixel supports apertures up to F0.7+.
2.2µm BSI GS sensors can achieve 1.08x sensitivity with an F2.0 lens and 2.16x sensitivity with an F1.4 lens. The new OG05B1B is a 5-megapixel (MP) resolution CMOS monochrome GS sensor in a 1/2.53-inch optical format. The new OG01H1B is a 1.5MP resolution CMOS monochrome GS sensor in a 1/4.51-inch optical format.
Let’s break down some of the features of these new GS sensors to better illustrate their benefits. Backside illumination – an advanced OmniBSI platform enables thinner modules than
FSI technology while delivering best-in-class light absorption and advanced image quality due to heightened sensitivity. Because of their large angular response, BSI image sensors have an F-number closer to F1.0, whereas FSI image sensors have only F2.0 (Figure 3). Near-infrared quantum efficiency – QE indicates the effectiveness of an imaging device in converting incident photons into electrons. Both new sensors employ Nyxel NIR sensor technology, which boosts QE to 700–1050nm for image sensors that see better and farther regardless of light level, while
using less power. These 3x QE improvements enable capture of sharp, bright images and delivery of optimum image data. These parameters are important indicators of the new GS sensors’ ability to optimize image capture of barcode scanners regardless of low-light conditions (e.g., dark warehouses, trucks, shelving, etc.), ensuring accurate data reading and decoding. Figure 4 illustrates the stark difference in quality and detail between images captured with and without Nyxel technology. Advanced packaging – The two new GS sensors utilise a unique stacked-die architecture, which features a 20 per cent increase in full-well capacity and increased signal-to-noise ratio compared to previous models, enabling higher dynamic range for best-in-class performance. The sensors also utilise the chip-scale package technology for the smallest possible dimensions.
Summary
Barcode scanning applications have become more sophisticated, imposing resolution and size requirements on image-based machine vision systems that existing solutions cannot meet. Global shutter image sensors offer unique benefits for this application that will enable OEMs to bring better-quality, more accurate scanners to market.
As a leading provider of CMOS image sensors for a wide variety of markets, including automotive, medical, security, computing, and IoT, OMNIVISION is bringing this leadership to the machine vision market.
https://www.ovt.com/
Imaging for Industrial – Machine Vision report, Yole Intelligence, 2024.
References 1
www.cieonline.co.uk
Components in Electronics
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