I am working on a project where I need to measure lengt of the objects floating on a surface. To perform that kind of sensing I am currently focusing on mouse sensors.
I first tried ADNS 6010; however, 8-bit delta x/y output (as displacement amount registers) of it became so small for the speed I desire which is 2 meter/sec. Even max frequency of reading did not be useful.
Then I tried a ADNS 9500 sensor which has 16 bit delta x/y registers. I get better results than 6010. But the problem is the accuracy of the output. When I measured same lenght with different speeds I get the output with 10% variaton. Also difference surfaces gives different results.
Now I am stuck which method to perform. I am thinking of changing the lense to focus a wide area, or changing technology. Changing lense is difficult to adjust a good focus point. It needs a well designed mechanical equipment. And chaning thechnology is a problem for me, since there is no other technology I can think of. So I would like to ask your recommendations.