MOI scanner

Magnetic codes can still be “seen” by the MOI scanners even when covered by paint.

Project

Our task was to design and build two prototypes of a handheld scanner for decoding 2D magnetic barcode symbols.

We started with the client’s concept prototype and patented MOI sensor

Technology

We used an embedded processor to control the internal scanners, display continuous scanner images on an LCD module, decode symbols on a trigger press, and send the data to a host PC via a USB connection.

The devices operate from a Lithium-Ion rechargeable battery.

Our contribution

We designed the case shells using CAD, and they were manufactured by a local rapid prototyping service.

Prototype with extra scanner which used a lens mounted on a “periscope”.

We revised the internal optics and made a 48-LED backlight to illuminate the MOI sensor.

We designed and built the internal PCBs.

We developed the firmware for the embedded processor.

Magnetic codes are not yet produced commercially. In future, such symbols may be used to encode information on parts that are subject to damage (as in the oil industry) or need to be on  unspoilt surfaces (as in the aerospace industry).

What are magnetic codes?

Magnetic 2D codes are a matrix of cells of approximately 1 mm diameter containing material which is permanently magnetised, like the example shown above. The codes may be covered by paint and therefore be invisible to the eye. But they can still be “seen” and decoded by the MOI scanners.

Where will magnetic codes be used?

Magnetic codes are not yet produced commercially. In future, such symbols may be used to encode information on parts that are subject to damage (as in the oil industry) or need to be on unspoilt surfaces (as in the aerospace industry).

Client

Quest Integrated, Inc

The MOI sensor is a thin crystal sheet by which magnetic information in an object touched against its outer surface influences the polarisation of light reflecting off the inner surface. This generates an image which can be viewed by a camera. If the object carries a magnetic barcode, the data can be decoded by an imaging scanner.

The scanners contain an MOI sensor, an illuminating backlight, a lens, a commercial imaging scanner and internal processor. The operator views the camera image in an LCD display. When a magnetic barcode is located, you squeeze the trigger switch and the decoded data is displayed and sent to the host PC, if connected.