An optical null detector design achieves exceptional efficiency of light utilization with a minimum of components providing (1) extremely sharp null recognition, (2) superior long term stability, (3) extremely low power requirement, and (4) minimal size and weight as well as several other desirable properties. The device involves the use of an inherently directional light emitting pattern (DLEP) of optimized geometry, generating nearly all usable light and eliminating several components functionally necessary, though performance limiting in conventional devices. It is particularly suited, though not restricted, to measurement and control applications by means of feedback techniques when high resolution, large dynamic range, and space economy are required simultaneously with sustained effectiveness over long periods of time.
Super sharp and stable, extremely low power and minimal size optical null detector