Uniform Illumination Control for Fluorescent Lamps
Original Publication Date: 1981-Aug-01
Included in the Prior Art Database: 2005-Feb-12
Fluorescent lamps tend to have a nonuniform illumination pattern along their length. This nonuniform illumination can be corrected by changing the duty cycle of the AC signal driving the lamp so that there is an inequality during each cycle of the AC current flow in each direction in the lamp. The illumination uniformity may be sensed by a CCD (charge-coupled device) array and processed by a microprocessor to control the duty cycle of the AC signal driving the lamp.