Abstract
In order to improve the subdivision precision and speed of grating moire fringe and meet the nanometer measurement requirement of grating displacement, the paper studies a new phase detection method that is the core technology of the classical phase-locked subdivision method and phase detection subdivision method. First, the output signal of grating sensor modulates the phase of the high frequency carrier wave signal, then, the new type system carries out real-time phase detection and tracking between the modulated carrier wave signal and carrier wave signal in every period, which assures the real-time feature and precision of phase detection. It can also discriminate the displacement direction according to the period relation of modulated carrier wave signal and carrier wave signal. All digital circuits are realized in FPGA. The method can improve the discrimination precision and remove the influence of carrier wave signal quality. Experiments prove that the system owns high anti-jamming ability, high tracking speed and high metrical precision.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
