Abstract
A new type of velocimeter using a ronchi-ruling was developed and its performance was investigated. Stripes of laser light generated by a grid illuminated the tracer particles in fluid flow. When the particles pass through the strips, the burst signal of scattered right could be detected by a photomultiplier. Frequency of the burst signal was analyzed by a FFT analyser. From the spectrum of the bust signal, flow velocity was calculated for the pipe flow. Obtained profile agreed with the theoretical profile of the pipe flow. Moreover, applicability of the velocimeter on the unsteady flow was discussed. Wavelet analysis was used for the calculation of burst frequency of unsteady flow. By using this method, it was confirmed that the unsteady flow could be measured by this velocimeter.
