Automatic identification and data capture (AIDC) refers to the ability to precisely identify objects and obtain key metrics such as IDs, target / destination address data etc. AIDC scanners are used in retail, point-of-sale terminals, courier pick-up, and warehousing for reading bar-codes or QR-codes. They are typically based on linear image sensors or 2D array imagers. AIDC scanners can also be found around high-speed conveyer belts in a distribution center where both the QR code and the volume of the package are monitored.
additional parameter sets some key metrics. For example, handheld AIDC scanners used in retail, point-of-sale terminals, courier pick-up, and warehousing are based on linear image sensors or 2D array imagers. Another example would be an advanced fixed camera in a high-speed conveyer belt in a distribution center where both the QR code and the volume of the package are monitored. In those installations they are typically realized by fixed installations of advanced high speed line scan or global shutter cameras.
AIDC systems consist of three parts: the illumination system, the optical sensor and the decoder. The illumination system lights the black and white elements of the barcode- or QR-code with Laser or LED light, typically in the red spectrum. In more advanced systems, the sensor consists of an image sensor which detects the reflected light from the illumination system and generates a digital signal stream which is sent to the decoder. Simpler systems realize the sensor function with an array of discrete photodiodes, which provide an analog signal of the obtained reflection signal. Finally the decoder, which is usually a small microcontroller, interprets the captured barcode- or QR-code signal response, validates it and converts it into numerical code which can be further processed within the controlling host system.
ams OSRAM provides the complete product portfolio for realizing the illumination and sensing part of an AIDC system: Right fit CMOS image sensors can be easily integrated into these scanners. High-speed line scanners enable 1D readout or easy integration in fast conveyer belts. Global shutter image sensors with high quantum efficiency enable power-efficient readout with no distortion of the scanned image data. These global shutter image sensors also enable 3D volume measurements if integrated in a 3D vision system using stereovision or structured-light.
Our laser diodes are the ideal light source for barcode- or QR-code scanning. New green laser diodes enable users to benefit from the four-times brighter appearance of a green laser compared to red without sacrificing the valuable features of red lasers. The better visibility is ideal for longer distance scanners. In terms of distance control, the optical solution could even be complemented with precise proximity or presence sensing solutions helping with autofocus and controlled system wake-up to save energy.