A bi-polar, two-dimensional LDV for near wall measurements.

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

A portable laserDopplervelocimeter designed for the measurement of two orthogonal velocity components which fluctuate in sign is presently being constructed. The optical system design overcomes one difficulty associated with standard two-dimensional LDV systems by utilising an equiangular three beam configuration to permit measurement of the normal velocity component v Bery close to a wall. Detection of the sign of the fluctuating components as well as elimination of cross-channel interference is accomplished by using a single acousto-optic modulator to shift the frequencies of two of the beams by 30 and 40 mHz respectively. The instrument is designed to operate in a backscatter mode with a2W argon laser, and is intended for measurements in low speed (s 1 mm/sec) to medium speed (+ or ! 8 m/sec) flowT (A)

Original languageEnglish (US)
Title of host publicationIN: PROC. 2ND INT. WORKSHOP ON LASER VELOCIMETRY, (PURDUE UNIV., U.S.A.: MAR.27-29, 1974), H.D. THOMPSON AND W.H. STEVENSON (
PublisherPurdue Univ
Pages90-96
Number of pages7
VolumeII, W. Lafayette, U.S.A.,Purdue Univ., 1974
StatePublished - 1974
Externally publishedYes

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Adrian, R. (1974). A bi-polar, two-dimensional LDV for near wall measurements. In IN: PROC. 2ND INT. WORKSHOP ON LASER VELOCIMETRY, (PURDUE UNIV., U.S.A.: MAR.27-29, 1974), H.D. THOMPSON AND W.H. STEVENSON ( (Vol. II, W. Lafayette, U.S.A.,Purdue Univ., 1974, pp. 90-96). Purdue Univ.