Light is introduced into a tissue sample. A first mode in which the display portion is unfolded or a second mode in which the display portion is folded is sensed by the sensor. In a presently preferred embodiment, the junction current is generated via illumination of the semiconductor junction. The upper biasing member and the lower biasing member are connected at a lock tip and biased away from each other. The augmented control of the ACE minimizes the amount of lost energy production by the wind plant.