- #1
Anton Alice
- 68
- 1
Hello.
On a german wiki article I have found the operation principle of a range finder:
https://de.wikipedia.org/wiki/Abstandsmessung_(optisch)#Lasertriangulation
Here are two pictures for illustration:
The Laser, the CCD sensor, and the lens are in a fixed relation to each other, inside a chassis.
Now it is said, that the scattering of the laser on the object surface is projected by the lens onto a point on the CCD. Then is is said, that in order to measure the distance of the object one has to either move the apparatus, or the object itself (which is illustrated by DZ in the second picture).
I don't understand why this is necessary. I could have measured the distance to the object without moving anything, because I know the orientation and distance of the laser relative to the lens and CCD. And by the position of the image point on the CCD chip I can determine the angle to the object.
Nothing more is needed...
On a german wiki article I have found the operation principle of a range finder:
https://de.wikipedia.org/wiki/Abstandsmessung_(optisch)#Lasertriangulation
Here are two pictures for illustration:
The Laser, the CCD sensor, and the lens are in a fixed relation to each other, inside a chassis.
Now it is said, that the scattering of the laser on the object surface is projected by the lens onto a point on the CCD. Then is is said, that in order to measure the distance of the object one has to either move the apparatus, or the object itself (which is illustrated by DZ in the second picture).
I don't understand why this is necessary. I could have measured the distance to the object without moving anything, because I know the orientation and distance of the laser relative to the lens and CCD. And by the position of the image point on the CCD chip I can determine the angle to the object.
Nothing more is needed...