Abstract
We present the application of the quadrature demodulation technique (QDT) for time-resolved frequency measurements in laser Doppler velocimetry (LDV). In contrast to conventional frequency estimators like FFT, the QDT allows the determination of the Doppler frequency nearly independent of the number of the occurring signal periods, so that a high time resolution can be achieved. The resulting frequency error of the QDT is investigated in dependence on relevant LDV signal parameters like SNR and time duration. Furthermore, the optimum averaging time for the processing of gaussian burst signals was determined. The minimum frequency uncertainty of the QDT occurs for an averaging time of the approximately equals 1/e burst duration at the thermal noise, and the approximately equals 1/e<SUP>2</SUP> burst duration at shot noise, respectively.
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.
