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 language | English (US) |
|---|---|
| Title of host publication | IN: PROC. 2ND INT. WORKSHOP ON LASER VELOCIMETRY, (PURDUE UNIV., U.S.A.: MAR.27-29, 1974), H.D. THOMPSON AND W.H. STEVENSON ( |
| Publisher | Purdue Univ |
| Pages | 90-96 |
| Number of pages | 7 |
| Volume | II, W. Lafayette, U.S.A.,Purdue Univ., 1974 |
| State | Published - 1974 |
| Externally published | Yes |
ASJC Scopus subject areas
- General Engineering