| 摘要 |
PURPOSE:To obtain a stable, highly sensitive, compact, and light weight probe with high resolution which can project and receive light at a position separated from a measuring device, by deviating at least one piece of a plurality of optical fibers, which are arranged at an end surface of one of a plurality of distributed index lenses, from the axial center position of each lens. CONSTITUTION:Laser light 7, which is inputted in a distributed index lens 32 through an optical fiber 34, is refracted, outputted from end surface 32b, and converged to a point P. The light reflected by particles in fluid 6 in the vicinity of the point P is inputted in an end surface 33b of a distributed index lens 33. The lengths of the lenses 32 and 33 and a deviation DELTAgamma of the optical fibers 34 and 35 from the central axes of the lenses are made equal. Therefore, the reflected light is refracted by the lens 33, converged at an end surface 35a of the optical fiber 35, and inputted in an photoelectric transducer 5 through the optical fiber 35. Since the end surfaces 34a and 35a are bonded and the deviation DELTAgamma are adequately set, high sensitivity and high resolution are obtained. Since the lenses 32 and 33 and the optical fibers 34 and 35 are fixed, the probe is made stable. |
