Chinese Journal of Lasers, Volume. 50, Issue 14, 1404002(2023)
On‑Machine Measuring System Based on Laser Triangular Displacement Sensor for Double‐Headed Screw Rotor
Figures & Tables(12)
Fig. 3. LTDS-based on-machine measuring system for double-headed screw. (a) Set-up diagram; (b) signal flow chart
Fig. 4. Acquisition system for spot image signal. (a) Principle diagram; (b) DAQ architecture diagram
Fig. 5. Original spot image signals acquired through experiment. (a) Real image of original spot; (b) binarized image of original spot
Fig. 6. Spot image signals after processing by our method. (a) Real image of spot after processing; (b) binarized image of spot after processing
Fig. 7. Test results of on-machine measuring system. (a) Original profile collected by method in section 3.1; (b) double-headed screw rotor profile fitted by method in Section 3.2
Fig. 9. Comparison of detected profiles of three measurement methods. (a) Overall measurement result; (b) measurement error relative to CMM
Table 1. Centroid extraction precisions of different methods
View tableTable 1. Centroid extraction precisions of different methods
Method RMS of deviation /pixel PV of deviation /pixel Gray centroid method 0.196 0.387 Gauss fitting method 0.205 0.412 Elliptic fitting method 0.183 0.354 Our method 0.147 0.269
Table 2. Comparison of data before and after fairing processing
View tableTable 2. Comparison of data before and after fairing processing
Before fairing processing After fairing processing R /mm d1 d2 d1 d2 71.495 33.310 71.495 33.315 0.005 70.370 36.455 70.370 36.446 -0.009 68.610 39.296 68.610 39.278 -0.018 66.408 41.758 66.408 41.766 0.008 63.954 43.830 63.954 43.828 -0.002 61.371 45.527 61.371 45.540 0.013 58.787 46.916 58.787 46.920 0.004 56.246 48.043 56.246 48.061 0.018 53.789 48.979 53.789 48.986 0.007 51.400 49.745 51.400 49.735 -0.010
Table 3. Measurement results of different measurement methods
View tableTable 3. Measurement results of different measurement methods
Method d1 /mm d2 /mm w /mm CMM 59.973 41.983 102.016 LTDS 59.997 41.998 101.986 OMM 59.982 41.989 101.007 Measurement error 0.009 0.006 -0.009 Nominal value 60 42 102 Tolerance zone ［-0.1，0］ ［-0.1，0］ ［-0.05，0.05］
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Mengnan Sun, Zhixu Dong, Wei Xu, Mingxuan Liu, Xingwei Sun. On‑Machine Measuring System Based on Laser Triangular Displacement Sensor for Double‐Headed Screw Rotor[J]. Chinese Journal of Lasers, 2023, 50(14): 1404002
Paper Information
Category: Measurement and metrology
Received: Jul. 4, 2022
Accepted: Sep. 7, 2022
Published Online: Jul. 10, 2023
The Author Email: Dong Zhixu (dong_zhixu@126.com), Sun Xingwei (sunxw@sut.edu.cn)
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