| 摘要 |
A boroscope (60) has a first end (62) and a second end (64) and the first end (62) of the boroscope (60) has an optical fibre (66, 67), a light source (68), a lens (70), a beam expander (72) and a transmissive diffractive optical element (74). The optical fibre (67) extends from the first end (62) of the boroscope (60) to the second end (64) of the boroscope (60). A laser optical fibre (71) extends from the lens (70) at the first end (62) of the boroscope (60) to the second end (64) of the boroscope (60) and a laser source (76) is arranged to direct a laser beam into the laser optical fibre (71). The beam expander (72) is provided between the laser optical fibre (71) and the lens (72) and the lens (72) is provided between the beam expander (72) and the transmissive diffractive optical element (74). The transmissive diffractive optical element (74) is arranged to produce a laser beam (L) with a predetermined shape and a focal length probe (77) extends from the first end (62) of the boroscope (60). |
