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| Q. |
Which technique from given laser inspection techniques is useful for measuring the diameter of hot steel bars? |
| A. | laser scanning gauge |
| B. | frequency laser interferometer |
| C. | laser triangulation sensors |
| D. | photodiode array imaging |
| Answer» A. laser scanning gauge | |
| Explanation: the laser scanning gauge technique is very useful to measure the diameter and roundness of hot steel bars under the vibration conditions to an accuracy of 0.025 millimeter over diameters of 5 to 25 millimeter. | |
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