In the case of large density difference, there is a velocity separation between different media, making the measurement more difficult, cross-correlation method is still usable.

在密度差别较大时，存在着不同介质间的速度分离，给相关法测量带来困难。

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This article introduced the basic theory and method of measuring the velocity of light using the method of phase difference and how to measure the velocity of light using phase difference in air.

介绍了一台自制的利用相位差法测量光速的仪器的基本原理和方法，并通过对光在空气中的传播速度的测定，使大家对用相位变化测量光速仪器有所了解。

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The comparison of the calculation time between the streamline simulation technique and the finite difference method also confirms that streamline simulation technique has better simulation velocity.

在流线模拟技术与有限差分方法运算时间的比较中，也证实流线模拟技术具有更快的运算速度。

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