title: Angle measurement with laser feedback instrument.
abstract: An instrument for angle measurement based on laser feedback has been designed. The measurement technique is based on the principle that when a wave plate placed into a feedback cavity rotates, its phase retardation varies. Phase retardation is a function of the rotating angle of the wave plate. Hence, the angle can be converted to phase retardation. The phase retardation is measured at certain characteristic points identified in the laser outputting curve that are then modulated by laser feedback. The angle of a rotating object can be measured if it is connected to the wave plate. The main advantages of this instrument are: high resolution, compact, flexible, low cost, effective power, and fast response.
authors.affiliation: Department of Opto-electronic Engineering, College of Opto-electronic Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
authors.forename: Wenxue
authors.initials: W
authors.lastname: Chen
authors.forename: Shulian
authors.initials: S
authors.lastname: Zhang
authors.forename: Xingwu
authors.initials: X
authors.lastname: Long
mesh_terms: D053587:Arthrometry, Articular / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005246:Feedback; D007834:Lasers; D012031:Refractometry / Q000295:instrumentation*