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. > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
