Abstract
An all fibre-based laser Doppler velocimetry system for the measurement of thepredominantly on-axis component of velocity is presented. The technique employsBragg grating-based Fabry–Perot interferometric filters custom-designed to suitthe transduction of Doppler optical frequency shifts to intensity. The sensitivity ofthe in-fibre filters to strain is exploited to provide tuning of the filter relative tothe centre wavelength of the laser and of the spectral shape of the filter, which inturn varies the velocity range, sensitivity and resolution. A phase-locking schemeincorporated to stabilize the filter is described together with a laser-wavelengthstabilization system that locks to a Doppler-broadened absorption line of iodinevapour. An optical fibre-linked probe head is used to couple the laser beamat 514.5 nm to and from the measurement volume. The velocimeter ischaracterized by measuring the velocity of a rotating disc over ranges of ±42and ±7 m s−1with a resolution of 0.2 m s−1.
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.
