Patent ID: 8525977
Filing Date: 2013-09-03
Classification: G01S

Abstract:
1. A phase measurement calibrating method based on the liquid crystal shutter principle, comprising the steps of: a light wave emitted by a light wave emitter to a tested target through a first liquid crystal shutter, being reflected by the tested target, being focused by an optical device, being received by a receiver, then being used as an external light path beam of the measurement system; while the light wave is passing through the first liquid crystal shutter, a part of the light wave being reflected by the first liquid crystal shutter to pass through a second liquid crystal shutter, the light wave passing through the second liquid crystal shutter being received directly by the receiver and used as an internal light path beam for fundamental reference of the system phase measurement; the first liquid crystal shutter and the second liquid crystal shutter being switched respectively while the system operates, so that the receiver being utilized for comparing phases of the internal and external light path beam received respectively to output phase shift for eliminating a fundamental reference.