Abstract: A high-sensitivity optical system to determine and/or control spatial displacement and position of objects applicable to various situations when a contact measurement cannot be performed, such as in high-vacuum or ultra-high vacuum chambers, at high temperatures, in aggressive chemical environments, etc. A laser beam is directed at a low glancing angle to a screen secured to an object. The screen's surface is normal to a motion direction of interest. A location of the bright laser beam spot on the screen surface is acquired and the displacement thereof is analyzed and quantified based on the change in distance from the laser beam spot to a reference element which is arranged on the screen and creates a variation in the acquired image brightness. A feedback loop control mechanism is provided which returns the displaced object to its original position.

Abstract: A high-sensitivity optical system to determine and/or control spatial displacement and position of objects applicable to various situations when a contact measurement cannot be performed, such as in high-vacuum or ultra-high vacuum chambers, at high temperatures, in aggressive chemical environments, etc. A laser beam is directed at a low glancing angle to a screen secured to an object. The screen's surface is normal to a motion direction of interest. A location of the bright laser beam spot on the screen surface is acquired and the displacement thereof is analyzed and quantified based on the change in distance from the laser beam spot to a reference element which is arranged on the screen and creates a variation in the acquired image brightness. A feedback loop control mechanism is provided which returns the displaced object to its original position.