Line-Structured Light Based Micro-Irregular Component Geometric Dimension Measurement Method

Fig. 9. Height measurement of different gauge blocks. (a) Original heights; (b) height measurements; (c) standard deviations of repeated measurement error in height

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Fig. 10. Width measurement of different gauge blocks. (a) Original widths; (b) width measurements; (c) standard deviations of repeated measurement error in width

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Fig. 11. Measurement test of No. 1 micro irregular component. (a) Original image of the component; (b) position of geometric points; (c) dimension measurement of different parts of the component; (d) geometric dimension error of the component

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Fig. 12. Measurement test of No. 2 micro irregular component. (a) Original image of the component; (b) position image of geometric points; (c) dimension measurement of different parts of the component; (d) geometric dimension error of the component

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Fig. 13. Measurement test of No. 3 micro irregular component. (a) Original image of the component; (b) position image of geometric points; (c) dimension measurement of different parts of the component; (d) geometric dimension error of the component

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Table 1. Internal parameters of industrial camera
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Table 1. Internal parameters of industrial camera
Internal parameter $f_{x}$ $f_{y}$ $u_{0}$ $v_{0}$ $k_{1}$ $k_{2}$
Value 10727.18454 10665.96410 1959.57724 1437.57213 -0.06288 4.67621

Table 2. Plane equation coefficients of line-structured light
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Table 2. Plane equation coefficients of line-structured light
Parameter $α_{C}$ $β_{C}$ $γ_{C}$ $δ_{C}$
Value -0.99553 0.02163 -1.00000 571.89965

Table 3. Fitting accuracy evaluation of line-structured light plane
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Table 3. Fitting accuracy evaluation of line-structured light plane
Parameter Average deviation Standard deviation RMS
Value /mm 0.053 0.041 0.067

Table 4. Actual thickness value of eleven gauge blocks
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Table 4. Actual thickness value of eleven gauge blocks
Block number 1# 2# 3# 4# 5# 6# 7# 8# 9# 10# 11#
Actual thickness value /mm 1.000 1.060 1.100 1.300 1.500 1.700 2.000 3.000 4.000 6.000 10.000

Table 5. Comparison of maximum measurement error of gauge blocks

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Table 5. Comparison of maximum measurement error of gauge blocks

Block number	True value /mm		Result of proposed method /mm		Result of multi-line fitting method /mm
Block number	Width	Height	Width	Height	Width	Height
1#	8.900	1.000	8.928	1.015	8.975	1.086
2#	8.900	1.060	8.847	1.008	8.883	1.158
3#	8.900	1.100	8.954	1.141	8.974	1.171
4#	8.900	1.300	8.925	1.268	8.819	1.389
5#	8.900	1.500	8.841	1.531	8.970	1.586
6#	8.900	1.700	8.838	1.735	8.813	1.792
7#	8.900	2.000	8.971	1.971	8.963	2.094
8#	8.900	3.000	8.988	2.976	8.950	3.095
9#	8.900	4.000	8.976	3.937	8.985	4.080
10#	8.900	6.000	8.847	5.947	8.997	6.084
11#	8.900	10.000	8.963	9.941	8.801	10.068

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Ziyong Ma, Fuquan Zhang, Lidong Ma, Hechen Ma, Jiahao Hang. Line-Structured Light Based Micro-Irregular Component Geometric Dimension Measurement Method[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1512001

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