maybe you can better define your requirements
do you want (1) a laser position sensor that senses objects AT a range of
400mm or (2) senses object WITHIN a total range of 400mm?
If (1), then there are several on the market that I can think of (Banner,
Keyence, others) that may suit your needs. If (2), I think you're out of
luck...laser triangulation sensors don't work like that.
High precision...specify. Resolution to what? 1mm? 0.001mm?
And if you want a position sensor that gives serial output, serial output of
what? The ON/OFF transition? Or some value describing the resolved
distance in the sensing range. You're probably not going to find either one
of those. You'll probably only find analog outputs to describe positions
within a range, otherwise it's a digital thing.
Sorry to be so anal, but inquiring minds want to know.
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