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What does it do?
The matrix collects data about what is passing between the turnstiles. It is the "eyesight" of the turnstile. Software then processes the information collected from the matrix, and makes active decisions about what is going through the lane: whether one or two people are entering; whether it is a person in a wheelchair or accompanied by a guide dog; or whether the person is towing a carry-on suitcase behind them, for example.
How does it do it?
Each detection matrix is made up of many wide-beam optical transmitters and receivers. Each transmitter sends beams across the lane to corresponding receivers, in a big criss-cross pattern. The beams are always monitored (unlike some competing units, where "shunt timers" ignore activity whenever a passage occurs--akin to a CCTV camera turning off whenever motion is detected). Beams at different heights and at different angles monitor blockages (arms, legs, packages) and holes (the empty space between a swinging arm and the torso, for instance), and use this information to infer what is going through the lane. And, because the beams are broad (wide-angle), the matrix operates perfectly even when it is severely out of alignment.
Why should I consider it for my site?
Optical detection is tricky business, and the "garbage in/garbage out" rule applies. The more independent data a turnstile collects, the better it can determine whether to generate an alarm or not. A matrix detection system offers better tailgate detection because beams on the diagonal are more likely to pass through a small space between two people. And, because it collects so much data, it can discern a dolly or suitcase from a second person, and ignore swinging arms and umbrellas. In short, matrix detection offers better security and a much lower false alarm rate than other systems.
Which models offer it?
All PathMinder products offer matrix detection. Our doorway tailgate sensors and most of our non-barrier optical turnstiles offer the 48-beam detection array. Our units with retractable barriers use a 96-beam matrix for added safety and security.
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