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本文报道一种测量固体表面速度变化的干涉仪。从光源发出的光经X型光纤分路器的A端输入,一分为二:一路由B端输出,经长光纤后通过偏振分光镜及1/4波片射向被测点;另一路由C端输出,经短光纤后,由偏振分光镜反射,沿上述相同的方向经1/4波片射至同一测点。长短光纤间固定光程差为Δ,略去测点的运动,两束光到达测点的时间差τ=Δ/C。它们先后从测点带回的多普勒频移信息分别与V(t)及V(t+τ)对
This article reports an interferometer that measures changes in solid surface velocity. The light emitted from the light source is input to the A terminal of the X-type optical fiber splitter in two ways: one is output from the B terminal, passes through the long optical fiber and passes through the polarizing beam splitter and the 1/4 wave plate to be directed to the measured point; the other The output from the C terminal is reflected by the polarizing beam splitter after passing through the short optical fiber and emitted to the same measuring point through the ¼ wave plate in the same direction as above. Length of the optical fiber fixed optical path difference between the Δ, omitted measuring point movement, the time difference between the two beams to the measuring point τ = Δ / C. They have been brought back from the measuring point Doppler frequency shift information and V (t) and V (t + τ) pairs