| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Research Abstract |
To develop a machine tool of high performance it is required to measure 2-D deformation amounts of it under : cutting process and then required to feedback the measured deformation data to design process of it Therefore, we studied real-time and precision measurement technique for 2-D deformation amounts of the machine tool. We had developed a technique by which a whole-field image representing the deforming amount can be measured without : phase shift techniques. Using this technique, deformation amounts of the object continuously deforming can be measured. But in step-like deformations, discontinuous deformation, usual techniques using a laser of single wavelength can not measure accurate deforming amounts, because of 2 π ambiguousties. Here, we developed a new technique, which can measure large deformations including step-like deformations, by combining the above technique with two laser beams of different wavelengths. From a multi-line beam of an argon laser 488.0nm and 514.5nm laser beams were selected and then separately introduced to two acoustic optical (AO) modulators. These AO modulators work as shutters of l/300s. After passing those, two laser beams were coupled to single-mode ; optical fibers and were conveyed to a speckle interferometer. The light reflected from the object deforming was interfered with the reference light and was focused on CCD array of the camera with the RESTART RESET mode. This camera synchronously working with the AO shutters can separately record two specklegrams which are of two wavelengths and are alternately focused on their CCD array with 0.2 ms interval. From the intensity signal changes ofspecklegrams, phase changes in each wavelength were calculated with the previously developed technique. Finally, large deformations including step-like deformations were obtained from phase differences in two wavelengths.
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