| 摘要 |
PURPOSE:To provide an inspecting device for surface flaw which enables to perform a high-speed and reliable measurement of a surface flaw of a high-temperature object to be measured, such as hot slabs, which is consecutively delivered for a long period of time using an electronic scanning type image sensor. CONSTITUTION:An object M to be measured is consecutively delivered in a direction of an arrow mark, and laser light emitted from a laser source 11 is rectilinearly (in a beltlike manner) 14 projected onto the object M to be measured by a cylindrical lens 13. Laser light 12 reflected from the object M to be measured enters a CCD camera 15, and an electronic scanning is conducted at the inside of the CCD camera 15 to produce an electric output. A sector 16 turns at a higher speed compared with the running speed of the object M to be tested. Thus, the laser light 12 enters the CCD camera 15 only for a very short time at each revolution of the sector 16, and is shut off from an incident light for other time. As a result, heat rays emitted from the object M to be measured are shut off likely, and thereby the CCD camera 15 is prevented from being damaged by heat. |
