Here is a link about a laser tracker seminar about ADM (Absolute Distance Measurement) from a laser tracker company.
https://www.digitalengineering247.com/article/high-speed-adm-distance-measurement-in-laser-tracking-applications/ They claim their time of flight protocol is nearly as accurate as IFM. They don't explain how they do it but our trackers had both and you could not tell the difference in accuracy. thanks Stuart On Mon, Mar 7, 2022 at 2:54 PM jeanfrancois <[email protected]> wrote: > Somewhere in the region of 5 US mils on a 50x50 mils region. > > I can try work out a solution if you have a budget shall I be successful > in the prototype. > > Regards, > > > Jean-François > > > Le 07/03/2022 à 21:37, Thaddeus Waldner a écrit : > > I need the small spot size of the measurement. I imagine US is not that > well defined. > > > >> On Mar 7, 2022, at 2:32 PM, jeanfrancois <[email protected]> wrote: > >> > >> 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. > >>>> > >>>> _______________________________________________ > >>>> Emc-users mailing list > >>>> [email protected] > >>>> https://lists.sourceforge.net/lists/listinfo/emc-users > >>> Cheers, Gene Heskett. > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Addressee is the intended audience. If you are not the addressee then my consent is not given for you to read this email furthermore it is my wish you would close this without saving or reading, and cease and desist from saving or opening my private correspondence. Thank you for honoring my wish. _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
