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Note: Simultaneous measurement of transverse speed and axial velocity from a single optical beam
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View: Figures


Image of FIG. 1.
FIG. 1.

The experimental setup is shown (a) along with a detailed look at the geometry of the projectile and the arrangement of sensing probes (b). The distance between each probe and the projectile (working distance) is indicated “WD” (b). The projectile's dimensions are to scale, and it measured 16 mm tall and 47 mm long.

Image of FIG. 2.
FIG. 2.

Normal Probe measurements show low-frequency amplitude fluctuations (b) not present in the case of purely axial motion (a).

Image of FIG. 3.
FIG. 3.

Velocity along the beam is shown for the bore probe (a) and angled probe (b). Angled probe axial velocities are cos(63°) times those measured by the bore probe (consistent with Fig. 1(b) ).

Image of FIG. 4.
FIG. 4.

The autocorrelation's decay (i.e., the coherence time) is indicative of the projectile's transverse speed.

Image of FIG. 5.
FIG. 5.

Transverse speed is calculated from speckle dynamics for the normal probe (a), (c), (e) and for the angled probe (b), (d), (f) and is compared with the velocity measured by the bore probe. The horizontal axis indicates the beam position on the target surface. Note, that the scales of the vertical axes vary from plot to plot and that the speckle analysis is clearly tracking relative changes in velocity from trial to trial. The systematic bias in (a), (c), and (e) will be the subject of further research.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Note: Simultaneous measurement of transverse speed and axial velocity from a single optical beam