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INTERFEROMETER INCORPORATING PROBE TYPE LASER DOPPLER VELOCIMETER
INTERFEROMETER INCORPORATING PROBE TYPE LASER DOPPLER VELOCIMETER
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机译:干涉仪掺入探针型激光多普勒测速仪
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摘要
PURPOSE: To obtain a laser Doppler velocimeter from which measurement errors derived from vibrations or stresses applied to an optical fiber or back scattered light, etc., produced in the optical fiber are eliminated. ;CONSTITUTION: The laser light emitted from a laser light source 10 is transformed to parallel rays 14 through a collimator lens 13 incorporated in a probe main body 2 after the light is propagated through a single-mode optical fiber 12 and split into a transmitted and reflected components by means of a half mirror 15. The light irradiating the surface of an object to be measured 4 is obtained by condensing the light transmitted through the half mirror 15 to the surface of the object 4 through a probe lens 7. The light reflected by the half mirror 15 receives twice frequency deviation by an angular frequency ωo from a frequency shifter 17 while the light makes a round trip between the mirrors 15 and 16 and becomes reference light 18. Scattered light 6 produced from the irradiating light 5 becomes parallel rays through the lens 7, heterodyne- interferes with the reference light 18 at the half mirror 15, and is converted into an electric signal by means of a photodetector 19.;COPYRIGHT: (C)1993,JPO&Japio
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机译:用途:为了获得激光多普勒测速仪,消除了由于施加到光纤上的振动或应力或光纤中产生的反向散射光等引起的测量误差。组成:从激光源10发出的激光在穿过单模光纤12传播并分成透射和透射光之后,通过并入探头主体2的准直透镜13转换为平行光线14。反射的光通过半反射镜15反射。通过将穿过半反射镜15的光通过探测透镜7会聚到被测物体4的表面,从而获得照射到被测物体4的光。半反射镜15发出的光从移频器17接收两倍于角频率ω o Sub>的频率偏差,同时光在反射镜15和16之间往返并成为参考光18。产生的散射光6来自辐射光5的光通过透镜7变成平行光线,外差在半反射镜15处与参考光18干涉,并通过光电探测器19转换为电信号。版权:(C)1993,JPO&Japio
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