Ideal for applications that require high-speed or high-resolution image capture, line scan cameras offer many benefits. The technology captures and merges multiple images to achieve high resolution in low light. Cameras can operate in different modes so that a single device addresses multiple applications.
Line scanning also eliminates the redundant processing of frame overlaps and delivers smear-free images. Dynamic range can be much higher than alternative image capture methods, while high pixel fill factor maximizes sensitivity.
These advantages make line scan cameras suitable for inspection of food and packaged goods, glass, lithium battery electrodes, and solar and silicon wafers. Defect detection also requires a variety of light geometries and types, as do other applications such as recycling and mineral sorting. The DNA sequencing industry is moving to time delay and integration (TDI) technology because it increases throughput while offering the required resolution and sensitivity.
Recent advancements enable multiple visible and nonvisible spectral bands to enhance vision capabilities. For example, SWIR can identify details such as water content and bruising underneath the surface of fruits.
Line scan applications require high-intensity illumination. Because of their stable spectral behavior and nearly immediate operation, LED lighting remains the standard choice. On the hardware front, some camera makers are incorporating elliptical reflectors instead of lenses to focus LEDs and overcome the limitation of chromatic aberration in color line scan cameras.
Advancements in line scan technology have significantly expanded its application capabilities. Improvements in contact image sensors (CIS) offer users compact design when space is at a premium, and a one-to-one ratio eliminates distortion at the ends of the field of view. Read more about the growing use of line scan cameras and their applications in this A3 article.
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“Advancements in line scan technology have significantly expanded its application capabilities.”
