| 摘要 |
PURPOSE:To distinctly execute photographing of a working part of a material to be worked without causing halation, etc., of a television camera by only setting a fixed delay time even if light emitting duration of a plume is varied due to a variation of a material value of an object to be worked and a variation of the energy quantity of an incident pulse laser light, in the pulse laser beam machine with a working part monitor. CONSTITUTION:Light emission of a plume 9 generated in a working part 8 of a part 7 to be worked by irradiation of a pulse laser light 3 is detected by a photodetector 10, a result of this detection is converted to a pulse signal S3 by a signal converter 11, and S3 is inputted to a controller 12. In the camera controller 12, S3 becomes an external trigger signal and its fall is detected, and based on its time as a reference, an exposure operation of a television camera 13 is controlled by a set prescribed exposure time Texp after a fixed prescribed delay time TD. |
