Dynamic frequency-domain interferometer for absolute distance measurements with high resolution

Weng, Jidong; Liu, Shenggang; Ma, Heli; Tao, Tianjiong; Wang, Xiang; Liu, Cangli; Tan, Hua

doi:10.1063/1.4902348

Cited by 3 publications

(1 citation statement)

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“…6 This technique may be used in future dynamic experiments, but it will be limited to experiments with a single, well defined surface, and obtaining accuracy to better than 100 µm may be a challenge. Weng et al 12 recently demonstrated a fast ranging diagnostic with distance precision of <1 µm; it records a white light interference spectrum with a high-speed streak camera and relays the light source to the target and from the target to the streak camera over a photonic crystal fiber. This approach may be useful for some dynamic applications.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous broadband laser ranging and photonic Doppler velocimetry for dynamic compression experiments

Lone

Marshall

Miller

et al. 2015

Review of Scientific Instruments

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A diagnostic was developed to simultaneously measure both the distance and velocity of rapidly moving surfaces in dynamic compression experiments, specifically non-planar experiments where integrating the velocity in one direction does not always give the material position accurately. The diagnostic is constructed mainly from fiber-optic telecommunications components. The distance measurement is based on a technique described by Xia and Zhang [Opt. Express 18, 4118 (2010)], which determines the target distance every 20 ns and is independent of the target speed. We have extended the full range of the diagnostic to several centimeters to allow its use in dynamic experiments, and we multiplexed it with a photonic Doppler velocimetry (PDV) system so that distance and velocity histories can be measured simultaneously using one fiber-optic probe. The diagnostic was demonstrated on a spinning square cylinder to show how integrating a PDV record can give an incorrect surface position and how the ranging diagnostic described here obtains it directly. The diagnostic was also tested on an explosive experiment where copper fragments and surface ejecta were identified in both the distance and velocity signals. We show how the distance measurements complement the velocity data. Potential applications are discussed.

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Section: Introductionmentioning

confidence: 99%