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The ABS sensor setup is a laser with a sprocket-like rotor. I works just like a laser mouse does. 90% of the time when ABS lights come on, you remove the sensor and clean it, and it goes back out.
As the rotor spins, the laser "Sees" the high points of the rotor and the low points, and there is a signal change depending on how far the laser has to travel before it hits the sensor inside the laser housing.
I just figured that they can do the job well, since they report wheel speeds to the car's ECU in real time.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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