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AnswerRe: maths question Pin
MikePelton3-Feb-20 21:33
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Joan M4-Feb-20 6:32
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Member 115770084-Feb-20 1:36
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davecasdf4-Feb-20 3:48
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Joan M4-Feb-20 21:32
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davecasdf5-Feb-20 4:48
Memberdavecasdf5-Feb-20 4:48 
Hi, You get good distance measurement ( I expect worse case error to be less than double the sensors if you don't have an angle ( beam to cl ) over 45deg. _that's a guess_ ).

Note, ( don't know scale ) at 3 uM, you're in the breath on it and it moves range.

You have a known 2 diameters "perfect" standard, you want to measure part diameter but part to measure may not be exactly located.

Try - draw this and check, I didn't - place your standard. Take 3 measurements, think about 3 arcs from the standards axis, move your standard, repeat, you have 8 unknowns ( x,y for each sensor, x,y for the standard ) and 3 measurements for the first location, 10 unknowns, 6 measurements for the second, 12 and 9, 3rd, 14 and 12 4th, 16 and 15 5th, 18 and 18 6th, at 17 you get a solution. Note that the error bars could be horrible depending on the setup. I suspect that placing the sensors in an approximately equilateral triangle helps, adding a 4th sensor should help, adding measurements will, I'd try a 3 x 3 grid of "target" points that covered most of the between sensor area.

But you will have to work on error analysis and see.

Have fun!
AnswerRe: maths question Pin
Member 108052214-Feb-20 4:47
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Member 108052214-Feb-20 4:52
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tnich4-Feb-20 7:44
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itprorh664-Feb-20 8:36
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itprorh665-Feb-20 4:43
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Rick Shaub4-Feb-20 11:28
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Gerry Schmitz5-Feb-20 8:04
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GeneralWSO CCC OTD 2020-02-03 Pin
OriginalGriff2-Feb-20 21:42
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GeneralRe: WSO CCC OTD 2020-02-03 Pin
pkfox2-Feb-20 22:08
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GeneralRe: WSO CCC OTD 2020-02-03 - we have a winner! Pin
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GeneralRe: WSO CCC OTD 2020-02-03 - we have a winner! Pin
musefan2-Feb-20 22:41
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GeneralRe: WSO CCC OTD 2020-02-03 - we have a winner! Pin
OriginalGriff2-Feb-20 22:57
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GeneralRe: WSO CCC OTD 2020-02-03 - we have a winner! Pin
pkfox21-Jul-20 10:33
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GeneralI might need to optimize this XD Pin
honey the codewitch2-Feb-20 6:02
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