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Title: Ldv Calibrator For The Air Speed Standard Between 1.3 To 40 M/S
Author: Noboru Kurihara, Yoshiya Terao, Masaki Takamoto
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: National Metrology Institute of Japan (NMIJ, formerly NRLM) developed a laser Doppler velocimeter (LDV) calibrator as the primary national standard for air speed between 1.3 and 40 m/s. A schematic of the presented system is shown in Fig.2. The calibrator has a rotor, shown in Fig.3, with single fine wire simulating the tracer particle, and can obtain the calibration factor in the same velocity range as that of the wind tunnel measurement by generating various velocities from the rotation. Newly developed technique enables the diameter measurement of the wire orbit in moving condition resulting in quite small calibration uncertainty. The orbit diameter in movement was measured with an optical linear scale as the distance of a rotor traversing and the influence of wire deformation was minimized. A measurement control volume of tested LDV was used to detect the wire orbit position. The calibration factor of tested LDV decided as a ratio of wire velocity to the average frequency of the Doppler burst signal.

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