Volume 32 Issue 11
Nov.  2017
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Refractive index field measurement of random medium based on background oriented schlieren[J]. Journal of Aerospace Power, 2017, 32(11): 2653-2658. doi: 10.13224/j.cnki.jasp.2017.11.012
Citation: Refractive index field measurement of random medium based on background oriented schlieren[J]. Journal of Aerospace Power, 2017, 32(11): 2653-2658. doi: 10.13224/j.cnki.jasp.2017.11.012

Refractive index field measurement of random medium based on background oriented schlieren

doi: 10.13224/j.cnki.jasp.2017.11.012
  • Received Date: 2016-04-27
  • Publish Date: 2017-11-28
  • Targeting the problem of light propagation effect caused by complex flow field, a method for measuring the complex refractive index field based on the background image was proposed. The calculation method and derivation process of refractive index field distribution based on particle image offset were given, and the resolution and sensitivity of the method were analyzed theoretically. On this basis, experiments were carried out on the distribution of the refractive index field above the flame. The experimental image was processed by using the particle image velocimetry (PIV) method. Result showed that, the maximum and minimum refractive index of the air was 100029 and 100009, respectively, according to the experimental measurement, and the effective value was less than 00001. The experimental results showed that this method had high accuracy and can realize the realtime accurate measurement of the complex refractive index field.

     

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