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Object recognition with a smart low-cost active infrared sensor array

The paper presents an effective solution for determining characteristic features of objects from a simple measurement set-up. A low-cost IR diode array, working on a reflection light scanner principle, has been designed. Essentially arrays of several emitter-receiver pairs are mounted on different sides of the area of observation, enabling the estimation of the size of the object in different dimensions and its reflection coefficient. The emitters are driven successively in time, hence no signal overlapping and cross-talk occur. The results show that from simple light intensity measurements, a variety of objects can be reliably recognised. As an example, the problem of determining the number of people getting into or out of a room is addressed. Two arrays of 3 diode pairs each are mounted on both sides of a doorway. With the proposed sensor, people can be recognised easily and are well separable from other echoes (motion of hands etc.), making the performance far more reliable than that of ordinary light barriers.