|Decting near torso, not hand
|FASTRun-R is radiating infrared into comparably a wide area. The detection
is from a surface, rather than a point. When a "large object"
comes into the radiation area, the Sensor units detects the object, ie.
a runner. Phototube system detects a point using a narrow beam, which often
causes an erroneous detection of a hand.
The pictures below is showing that the detection occurs at the timing when
a "large object" is inside the detection area. The red LED indicates
the timing of detection. Even if the runner (that's me!), tried to fool
the Sensor unit by spreading the hand ahead, the Sensor unit detected the
timing near the torso.
note: FASTRun-R detects "large object", this does not mean it
exactly detects torso. When a runner is running in the specified distance
(60cm to 120cm) from the Sensor unit, the error is expected to be about
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