| How linear is the MMDM response? |
 |
 |
 |
|
The displacement of the mirror surface is proportional to the SQUARE of the applied voltage. The mirror response can be linearized using the operation of square root. For 8-bit biased digital control the following expression can be used to convert the control signal CS (in the range -1...1) into the control byte CB applied directly to the digital board controlling the mirror actuator: CB=(int)sqrt(0.5*(CS.))*255.; This formula provides linear correspondence between the control signal CS and the mirror displacement and sets the mirror into theoretical biased position when CS=0. MMDM features negligible hysteresis. |