The influence of the modal dispersion of signal fiber on velocity measurement in VISAR applications

LI Ze-ren

doi:10.11883/1001-1455(2005)05-0457-04

Volume 25 Issue 5

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LI Ze-ren. The influence of the modal dispersion of signal fiber on velocity measurement in VISAR applications[J]. Explosion And Shock Waves, 2005, 25(5): 457-460. doi: 10.11883/1001-1455(2005)05-0457-04

Citation:

LI Ze-ren. The influence of the modal dispersion of signal fiber on velocity measurement in VISAR applications[J]. Explosion And Shock Waves, 2005, 25(5): 457-460. doi: 10.11883/1001-1455(2005)05-0457-04

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The influence of the modal dispersion of signal fiber on velocity measurement in VISAR applications

doi: 10.11883/1001-1455(2005)05-0457-04

LI Ze-ren

1.
Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China

Publish Date: 2005-09-25

Abstract

Abstract

The influence of the modal dispersion of a signal fiber on velocity measurement in VISAR is theoretically analyzed and discussed in detail. A mathematical analysis model about the interfering contrast decreased by model dispersion is set up. The dispersion contrast factor varied with fringe constants and velocity increment is calculated. The results show: (1) the larger the fringe constants, the smaller the influence of the modal dispersion of a signal fiber; (2) the larger the measured velocity ,the larger the influence of the modal dispersion; (3) the influence of the modal dispersion of a multimode step-index fiber is larger than one of a multimode graded-index fiber. After this research, the efficient methods that decrease the influence of the modal dispersion of a signal fiber is put forward. This play an important role in improving interfering contrast and measuring precision in VISAR.

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