| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser measurement apparatus capable of introducing and deriving a laser beam without using purge means.SOLUTION: The laser measurement apparatus comprises: laser introduction means 14 introducing a laser beam 12 from a laser emitting unit 11 into a gas duct 13 which is a measurement field; and laser derivation means 16 deriving the introduced laser beam 12 from the gas duct 13 toward a laser receiving unit 15. The gas duct 13 has a negative pressure therein, and the laser introduction means 14 and the laser derivation means 16 each include: a laser beam passing window 21 having a passage hole 21a through which the laser beam 12 passes; a window frame 22 supporting the laser beam passing window 21; and a fitting flange 24 attaching the window frame 22 onto a wall surface of the measurement field 13 using a bolt 25 which is fitting means. |
