Optical fiber probe for laser doppler velocimeter

Abstract

Abstract PURPOSE:To improve sensitivity by intensifying scattered light or to measure the velocity of flow at a distance from a probe with high sensitivity by providing a refractivity distribution type lens to the top of an optical fiber, then condensing or collimating emitted light. CONSTITUTION:A refractivity distribution type lens 6a whose one end is tapered is provided in contact with the emission end of an optical fiber 10, and the surface of the tapered part is mirror-finished 7. Instead of the abve, a pi/2-cut refractivity distribution type lens 6b is provided in contact with the emission end of the optical fiber 10, and a transparent member 8 whose one end is tapered and mirror-finished 7 is further provided in contact with the emission end. Consequently, emitted light 4 is focused on a desired point or made into a desired parallel beam of luminous flux to improve sensitivity by increasing the intensity of the scattered light by scattering particles 3 or to measure even the velocity of flow considerably apart from a probe with high sensitivity.

Inventors

• 👤 Shuichi Tai
• 👤 Kazuo Hisama
• 👤 Toshio Aranishi
• 👤 Koichi Hamanaka

Bibliographic Details