Are ultrasonic sensors doing the job in that tolerance ?
Jean-François
Le 07/03/2022 à 21:01, gene heskett a écrit :
On Monday, 7 March 2022 12:44:21 EST Thaddeus Waldner wrote:
Hi,
I’m looking for a laser distance sensor with about 1-3 thousandths
resolution and about a 5-10” working range. I wouldn’t mind buying a
used unit.
1. I didn't know they came in that high a resolution w/o needing a quorum
of the US Senate to authorize the payment, then signed by the President.
If you want to know why, calculate the time difference of that 3
thousandths of an inch increment, remembering that it has to travel out,
and back to the measuring device, equal to C/2 in speed. You will I
suspect will come up with a very small fraction of a picosecond.
Interferometry can measure that change, but the mod function to detect
the individual null and count it has to start at zero, or a known micron
sized distance before it can count the nulls passing by as it moves from
zip distance, back to your point of interest at a 12" max range. Moving
slow enough to count, will take a 2048 bit counter and several days.
Technically, we can do it but you'll need a couple of dump trucks full of
gold to finance one neasurement. We can't yet buy a calibrated answer in
10 milliseconds for a $500 bill. Someday? Maybe, but it may take a new
method to be invented.
Does anyone here know of some brands/ models to check out?
Google has pointed me at some Acuity products but I wondered if there
were other options besides that.
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Cheers, Gene Heskett.
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