Complex sentence: In this approximation, the frequency shift is not affected by the direction of the optical radiation; it is only affected by the velocity and the angle between the flow direction and the acoustic wave propagation direction H. Fang, K. Maslov, L.V. Wang.
Split into simpler sentences: In this approximation, the frequency shift is not affected by the direction of the optical radiation. It is only affected by the magnitude of velocity and the angle between the velocity and the acoustic wave propagation direction H. Fang, K. Maslov, L.V. Wang.