OTM technology pen phree OTM technologies invented an optical translation measurement (OTM) sensor that precisely tracks hand motion across virtually any surface, in a wide dynamic range. they managed to engineer and build a compact, low-cost optical sensor that fits at the tip of a pen-like device. the combination of breakthrough technology and ergonomic, the company designed a user-friendly pen named ‘phree’. the patented OTM sensor is a compact 3D laser interferometer. it tracks the relative motion of a nearby surface by measuring the interference signal between a laser beam projected on the surface and the reflections from the surface. the signal is then translated to X-Y-Z motion information by our signal-processing algorithms running on a very small, integrated electronics component.
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