A new method for evaluating errors in high-frequency ADV measurements

✍ Scribed by Stuart J. McLelland; Andrew P. Nicholas

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 282 KB
• Volume: 14
• Category: Article
• ISSN: 0885-6087
• DOI: 10.1002/(sici)1099-1085(20000215)14:2<351::aid-hyp963>3.0.co;2-k

✦ Synopsis

The acoustic Doppler velocimeter (ADV) measures three-dimensional velocities in a small, remote sampling volume at high frequencies, however, these measurements incorporate errors that are intrinsic to the measurement technique. This paper demonstrates a new method for calculating the total measurement errors, including sampling errors, Doppler noise and errors due to velocity shear in the sampling volume associated with single-point ADV measurements. This procedure incorporates both the eects of instrument con®guration and the distribution of errors between velocity components for any probe orientation. It is shown that the ADV can characterize turbulent velocity ¯uctuations at frequencies up to the maximum sampling rate and that Reynolds shear stress errors are very small.