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Utilizing interferometry techniques normally applied only in high-performance professional applications, Philips Laser Sensors’ twin-eye laser technology leverages the latest developments in solid-state lasers, digital signal processing and System in Package (SiP) technology to achieve unparalleled resolution and accuracy for position/velocity sensing in consumer-product applications (see figure 1). A solid-state laser in the sensor generates an 850nm wavelength infrared laser beam that is focused by a lens onto the surface of the target object whose position/velocity is being measured. The laser light is scattered by the target surface, resulting in some of the light returning to the sensor and re-entering the laser source, where it optically mixes with the light being generated by the laser (see figure 2).
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