Why I wear Cone Shaped Hats ie ?Mr Hall

[Mike Turner]

I don't recognize "shutter." The ABS units have a gear tooth style
actuator. The bearings have things that look strangely like teeth in a
transmission, but aren't helical and have next to no depth, which pass in
front of the sensor. Tooth width is about 1/10th inch. Length is about a
half an inch. Depth is also about a 1/10th of an inch. It's been a while
since I looked but that should be close. Since this is a magnetic effect,
proximity to iron or something else ferrous in the detection gap is the
main influence. Note that since copper, aluminum, and other non-ferrous
materials have little effect on the magnetic flux, Hall effect sensors
don't work so well with them. If you are asking if the material blocks the
magnetic flux, well that is dependent on design chosen by the engineer.
Varying the reluctance of the magnetic path can either strengthen the flux
through the sensor or coax the flux away from the sensor. Shuttering or
blocking is not really descriptive of what is happening. Think of the flux
as flowing water and the iron as guiding the flux to or away from the
sensor. Darn, I've gotten long winded again. The echoes in my CSH are
starting to deafen me.