A laser beam is irradiated onto a moving object, and scattered light reflected from the moving object is split into two beams, which are then received through respective spatial filters that are 90.degree. out of phase with each other, thereby providing two signals. The signals are processed to determine the movement direction of the moving object.

 
Web www.patentalert.com

< System and method for enhancing confocal reflectance images of tissue specimens

< Recording and reproducing method for optical recording medium and optical recording medium

> Method and apparatus for recording data on an optical recording medium

> Optical apparatus and laser display apparatus having laser beam scanner each

~ 00287