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| Q. |
Which technique is not suitable to measure large diameter parts or large gaps? |
| A. | diffraction pattern technique |
| B. | scanning laser technique |
| C. | photodiode array imaging |
| D. | laser triangulation sensor |
| Answer» A. diffraction pattern technique | |
| Explanation: diffraction pattern technique is not suitable for diameters larger than few mm and is used to measure small gaps and small diameter parts. in this method, a parallel laser beam which is coherent is diffracted by a small part, and the resultant pattern is focussed on a linear diode array by a lens. | |
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