Hi,
This is a subject that has been discussed extensively and there are great posts from EricGibbs. My problem is similar but there are a few catches so I wanted to ask here.
I am trying to design a laser range finder(not exactly read on) with 1mm or less accuracy over 300mm effective distance. For a reason we cannot use a collimated beam so I am using lasers with 10 degree half angle.
Current idea is to modulate the laser beam at a high frequency and look at the change in phase. Actually we don't even care about the absolute distance but change in distance in mm. I.e. getting closer or not. However this requires a very high frequency circuit and I am trying to find out if there is a better way.
Eric talks about hybrid logic/analog circuit to do this without a very high frequency counter and I am just curious if it could be applied here.
(https://www.electro-tech-online.com/threads/hellp-me-to-build-laser-range-finder.43169/)
Any ideas you can suggest would be great.
Thanks,
KT
This is a subject that has been discussed extensively and there are great posts from EricGibbs. My problem is similar but there are a few catches so I wanted to ask here.
I am trying to design a laser range finder(not exactly read on) with 1mm or less accuracy over 300mm effective distance. For a reason we cannot use a collimated beam so I am using lasers with 10 degree half angle.
Current idea is to modulate the laser beam at a high frequency and look at the change in phase. Actually we don't even care about the absolute distance but change in distance in mm. I.e. getting closer or not. However this requires a very high frequency circuit and I am trying to find out if there is a better way.
Eric talks about hybrid logic/analog circuit to do this without a very high frequency counter and I am just curious if it could be applied here.
(https://www.electro-tech-online.com/threads/hellp-me-to-build-laser-range-finder.43169/)
Any ideas you can suggest would be great.
Thanks,
KT