I am thinking about photo-finish application (linear array) involving exposure times less than 0.0005 seconds (2000 frames/second). To minimize variation in brightness so that significant changes in frame content can be recognized reliably (and "duplicate frames" can be compressed on the fly), I think that I need to avoid the flicker associated with lighting powered directly by 60 Hz AC.
I think that I need to supply constant intensity illumination sufficient to mask variation due to ambient light sources. To do this, I suspect that I need to be able to control the sensitivity of the photo sensor AND to control the intensity of supplementary illumination.
Secondly, since the system may need to be "tuned" efficiently (quickly) to operate in new environments, I need "setup" diagnostic outputs to register (1) absence of flicker in the exposed images and (2) "middle of the curve" image exposure. (The linear images will be combined to display time-domain "photos".)
Questions:
1. Am I "overthinking" this?
2. Are LED's powered by well filtered DC a good choice for illumination?
3. Is it most reasonable to include a "setup mode" in the support software to guide setting the illumination and sensitivity?
Bonus question:
4. Are there color linear photo arrays available (at reasonable cost) in which the color sensitive pixels are not offset? (I ask because all of the color linear photo arrays that I've looked at are really rectangular rather than linear and depend on constant speed of the subject to form a true image of the subject.)
I think that I need to supply constant intensity illumination sufficient to mask variation due to ambient light sources. To do this, I suspect that I need to be able to control the sensitivity of the photo sensor AND to control the intensity of supplementary illumination.
Secondly, since the system may need to be "tuned" efficiently (quickly) to operate in new environments, I need "setup" diagnostic outputs to register (1) absence of flicker in the exposed images and (2) "middle of the curve" image exposure. (The linear images will be combined to display time-domain "photos".)
Questions:
1. Am I "overthinking" this?
2. Are LED's powered by well filtered DC a good choice for illumination?
3. Is it most reasonable to include a "setup mode" in the support software to guide setting the illumination and sensitivity?
Bonus question:
4. Are there color linear photo arrays available (at reasonable cost) in which the color sensitive pixels are not offset? (I ask because all of the color linear photo arrays that I've looked at are really rectangular rather than linear and depend on constant speed of the subject to form a true image of the subject.)