Hello,
I'm developing a control system to stabilize the luminance and the color temperature of a light source (an incandescent lamp). Both the luminance and the color temperature depend on the current supplyed to the lamp. I have these specifations:
- if the color temperature variation is less than 10K follow only the luminance variations, else correct the current supplyed and check whether the luminance satisfies with its specifications;
- if the luminance variation is less than 0.5% but greater than 0.1% (0.1% is the uncertainty on the luminance measure) there is only an offset correction, else if the variation is greater than 0.5% correct the current supplyed and check whether the luminance satisfies with its specifications;
- if luminance and color temperature come into conflict alert the operator to do a new calibration.
I know that, when the lamp is supplyed with its nominal current, the relation between current and luminance is L = A + B*I, while a variation a 4.5mA causes a variation of 1K. I read the value of luminance and color temperature from a photodiode.
Till now I have only developed simple LTI closed control loop using simulink, I don't know how to manage this problem. I'd like if someone of you could give me some suggestions.
Thank you