MEASURING DEVICE APPLYING LIGHT

摘要

PROBLEM TO BE SOLVED: To provide a measuring device applying light that has no possibility of positional shift and detaching of optical system caused by adhesive. SOLUTION: In a cylindrical unit 23, a round hole fabricated with a reamer at once is formed. A GRIN(refractivity distribution) lenses 24 are formed to accurately fit in the axis holes in the transmission fiber 2 side and the sensing fiber 5 side of the cylindrical unit 23 and fixed. Ferrules 19 at the ends of the transmission fiber 2 and the sensing fiber 5 are formed to accurately fit in the axis hole and fixed. From the transmission fiber 2 side and the sensing fiber 5 side, the light axes exactly coincide. A polarizer 4 is contained and fixed in a containing part 23a formed in between the transmission fiber 2 side and the sensing fiber 5 side in the cylindrical unit 23.