Re: 0 to 360 degree camera and MORE!
Posted: Fri Sep 09, 2016 12:28 am
The forum seems a bit dead at present and probably there is little interest in this laser
project anyway.
However, I have made some discoveries.
Firstly, the 45 degree angle of the fast rotating 1/4 inch mirror is absolutely critical to give
straight line scanning. Even a few thou error leads to inches of error in line linearity.
(the scanning line rises and falls)
Secondly, although it will scan up to 180 degrees, any image wider that this leads to inversion !!
For example, as one scans down, the laser over 180 degrees, is rising up and vica verca.
This will always happen even if not using any rotating mirror.
So a 360 degree scan image will have the first 1/2 correct and as one goes over 180 degrees
the second part slowly reverses. Interesting eh? This could probably be overcome
by plotting the 180 to 360 degree of the image in reverse in the software program.
The laser width is too big for very big close ups (less than about 3 feet), so I must see
if I can focus it smaller.
All 3 sections of construction are now underway......
The circuits for ADC and PWM etc. The mechanical construction and the laptop program I am working on.
project anyway.
However, I have made some discoveries.
Firstly, the 45 degree angle of the fast rotating 1/4 inch mirror is absolutely critical to give
straight line scanning. Even a few thou error leads to inches of error in line linearity.
(the scanning line rises and falls)
Secondly, although it will scan up to 180 degrees, any image wider that this leads to inversion !!
For example, as one scans down, the laser over 180 degrees, is rising up and vica verca.
This will always happen even if not using any rotating mirror.
So a 360 degree scan image will have the first 1/2 correct and as one goes over 180 degrees
the second part slowly reverses. Interesting eh? This could probably be overcome
by plotting the 180 to 360 degree of the image in reverse in the software program.
The laser width is too big for very big close ups (less than about 3 feet), so I must see
if I can focus it smaller.
All 3 sections of construction are now underway......
The circuits for ADC and PWM etc. The mechanical construction and the laptop program I am working on.