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Title: Lda Volume Flow Rate Standard For Water Using High Spatial Resolution Lda For Traceable Measurements In Power Plants
Author: m. Juling J. Steinbock m. Kraume , T. Lederer
Source: Flomeko 2016
Year Published: 2016
Abstract: At the Physikalisch - Technische Bundesanstalt (PTB) a laser o ptical volume flow rate standard ( LFS ) has been developed to calibrate flow meters on site within a power plant. The velocity profile within the pipe is measured with laser Doppler anemometry (LDA). The profile is integrated to calculate the volume flow rate. Since conventional LDA has a measuring volu me length of about 2 mm, the near wall region cannot be resolved. This leads to an offset of the volume flow rate of about 1. 3 %. To overcome this limitation high resolution LDA (HR - LDA) was developed. Therefore, a LDA measuring volume with constant fringe spacing is overlaid with a n LDA measuring volume with divergent fringe spacing. In t his way, the position of a particle passing the measuring volume can be determined with a resolution of 50 m . With the HR - LDA the influence of the near wall region on the volume flow rate wa s reduced from 1. 3 % to 0 . 04 %.

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