Photogrammetric Method for Large Trough Solar Reflector

Fig. 4. Selecting the non-collinear image points on image surface through convex envelope contours detection method. (a) Selecting four vertices of convex envelope; (b) selecting five non-collinear image points; (c) only three vertices of convex envelope

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Fig. 5. Flow chart of trough solar reflector surface measurement

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Fig. 6. Schematic of cameras extrinsic parameters conversion

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Fig. 7. Larget rough solar reflector surface measurement field

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Fig. 8. Photo taken by the photogrammetric camera (segment)

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Fig. 9. Measurement results of large trough solar reflector surface. (a) Position distribution of the camera; (b) parabolic surface fitting by measuring points

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Table 1. Extrinsic parameter absolute error results obtained by relative orientation

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Table 1. Extrinsic parameter absolute error results obtained by relative orientation

Absoluteerror	Mean	Maximum	Minimum	Standard
ΔX_t /mm	1.077	6.544	0.050	1.881
ΔY_t /mm	2.668	10.080	0.008	3.634
ΔZ_t /mm	1.587	7.699	0.012	1.896
Δφ /(°)	0.002	0.071	0	0.015
ΔΩ /(°)	0.019	0.198	0	0.024
Δκ /(°)	0.007	0.148	0	0.015

Table 2. RMS absolute errors of measuring points and εz after bundle adjustment
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Table 2. RMS absolute errors of measuring points and εz after bundle adjustment
Error Mean Maximum Minimum Standard
ΔX /mm 0.013 0.033 0.010 0.003
ΔY /mm 0.008 0.020 0.006 0.002
ΔZ /mm 0.008 0.020 0.006 0.002
ε_z /mm 1.050 5.547 0.005 1.466

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Jun Wang, Mingli Dong, Wei Li, Peng Sun. Photogrammetric Method for Large Trough Solar Reflector[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051204

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