| 摘要 |
PURPOSE:To easily alter a measuring direction without rotating an entire apparatus in a laser Doppler speedometer for measuring, for example, a speed of particles, etc., in fluid by using a laser Doppler method. CONSTITUTION:The laser Doppler speedometer comprises holes 21, 22 for passing laser lights, prisms 23, 24 which input the light from one ends and emit it from the other ends, and an emitting position rotating jig 20 rotated to a first rotary position where the lights pass the holes 21, 22 and a second rotary position where the lights input to the prisms 23, 23 thereby to rotate a laser light emitting direction at 90 degrees. |
