Jian Wang, Fei Li, Youwei Fang. Optical Measurement Method for a Traveling Wave Tube Helix[J]. Acta Optica Sinica, 2020, 40(9): 0912001
- Acta Optica Sinica
- Vol. 40, Issue 9, 0912001 (2020)
Fig. 1. Basic information of TWT helix. (a) Helix's outline; (b) distribution of pitch
Fig. 2. Traditional placement of helix
Fig. 3. Variable pitch at start position
Fig. 4. Measurement error of pitch based on point measurement algorithm. (a) Measurement direction deviates from helix axial direction; (b) schematic of error source
Fig. 5. Change of placement height of helix with cone angle in outer diameter (not scaled)
Fig. 6. Pitch boundary was hidden from view
Fig. 7.
Device of placement and adjustment of helix. (a) Isometric view; (b) top view; (c) section view of A-A; (d) partial enlarge view of B; (e) supported position and angle of helix
Fig. 8. Workpiece coordinate system on the placement device. (a) Top view; (b) left view
Fig. 9. Automatic filtering effect based on linear viewfinder. (a) Schematic diagram of burr; (b) effective filtering; (c) invalid filtering
Fig. 10. Error of distance between intersection points caused by unparallel boundary of helix strip
Fig. 11. Repeatability of pitch measurement results
Fig. 12. Outer diameter measurement block
Fig. 13. Schematic of outer diameter measurement
Fig. 14. Inner diameter measuring device
Fig. 15. Automatical search results for the edge of inner diameter. (a) Before optimization; (b) after optimization
Fig. 16. Scanning cloud chart of helix's outer surface. (a) Optical microscope imaging; (b) laser confocal microscope imaging
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Table 1. Comparison of time consumed by each strategy
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Table 2. Roughness measurement results
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