Influence of Distance Factor onthe Scanning Accuracy of Terrestrial Laser

Meijie Yang; Jun Liu

doi:10.3788/LOP57.122804

Journals >Laser & Optoelectronics Progress >Volume 57 >Issue 12 >Page 122804 > Article

Laser & Optoelectronics Progress
Vol. 57, Issue 12, 122804 (2020)

Influence of Distance Factor onthe Scanning Accuracy of Terrestrial Laser

Meijie Yang and Jun Liu^*

Author Affiliations

College of Urban Rail Transit, Shanghai Engineering Science University, Shanghai 201620, China

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DOI: 10.3788/LOP57.122804 Cite this Article Set citation alerts

Meijie Yang, Jun Liu. Influence of Distance Factor onthe Scanning Accuracy of Terrestrial Laser[J]. Laser & Optoelectronics Progress, 2020, 57(12): 122804 Copy Citation Text

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Fig. 1. Experiment of laser intensity and scanning distance. (a) Schematic; (b) real scene; (c) intercepting target data

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Experimental scene. (a) Indoor experimental scene; (b) schematic diagram of four-color cardboard combination; (c) lawn scene; (d) ground scene (inside red line frame)

Fig. 2. Experimental scene. (a) Indoor experimental scene; (b) schematic diagram of four-color cardboard combination; (c) lawn scene; (d) ground scene (inside red line frame)

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Fig. 3. RGB value of point cloud intensity for lawn scene before and after correction. (a) Before correction; (b) modified sectional polynomial model; (c) modified Taylor interpolation polynomials model; (d) modified the mixed model of sectional Gaussian function and polynomial

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Fig. 4. RGB value of point cloud intensity for ground scene before and after correction. (a) Before correction; (b) modified sectional polynomial model; (c) modified Taylor interpolation polynomials model; (d) modified the mixed model of sectional Gaussian function and polynomials

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Emittedpower /mW	Wavelength /nm	Beamdiameter /mm	Field ofview /(°)×(°)	Beamdivergence /(°)	Rang /m
20	905	3.8	360×305	0.009	0.6—120

Table 1. Main parameters of FARO Focus^3D 120

Fitting function	Parameter	First half			Parameter	Second half
Fitting function	Parameter		SSE	R-square	RMSE	SSE	R-square	RMSE
Polynomial	1	6173	0.5747	38.16	1	90.62	0.956	5.35
	2	6089	0.5892	38.25	2	84.32	0.963	6.467
	3	82.230	0.9933	5.394	3	6.546	0.998	2.409
	4	52.091	0.9974	5.120	-	-	-	-
	5	7.982	0.9993	2.562	-	-	-	-
	Power function	-	-	-	-	1	81.23	0.961	5.097
Exponential	-	-	-	-	1	89.53	0.958	5.431
function	-	-	-	-	2	53.15	0.978	7.289
Fourier function	1	7.354	0.9989	1.811	1	84.97	0.963	9.249
Gaussian	1	7.522	0.9995	1.954	-	-	-	-
function	2	0.023	1	0.120	1	85.43	0.961	6.451
Taylorpolynomial	Whole curve
Taylorpolynomial	Interpolation	0.0209	1	0.098	Last two points are reserved to calculate theroot mean square error of the fitting function

Table 2. Reflection intensity data fitting table

Item		Blue		Red		Green		White		Lawnscene	Groundscene
Item		Left	Right	Left			Right	Left	Right	Left	Right
R/m	min	5.947	5.963	5.941	5.935	5.942	5.947	5.954	5.941	1.948	1.998
R/m	max	5.971	5.944	5.965	5.964	5.971	5.962	5.993	5.963	30.25	10.10
I	min	1943	1942	1941	1943	1944	1945	1938	1948	1648	1325
	max	1950	1950	1952	1955	1951	1952	1953	1956	2035	1789
	A minA max	18621865	18611866	18681875	18691873	18671871	18661869	18691878	18691874	18251911	14651568
	B minB max	19491955	19521959	19491957	19431951	19541960	19541962	19561968	19561963	18361955	15461689
	C minC max	17851793	17851792	17611767	17591770	17301735	17281736	17261738	17251734	17671965	13981584
	D minD max	17881799	17561781	16831690	16501661	16841691	17291735	17791796	17501764	16942005	13681656
Mean	Original	1946	1946	1947	1948	1947	1948	1949	1952	1895	1548
	A	1864	1865	1871	1870	1869	1867	1874	1872	1866	1543
	B	1952	1958	1953	1948	1957	1958	1966	1958	1903	1563
	C	1789	1786	1765	1768	1734	1724	1735	1729	1869	1458
	D	1793	1768	1686	1658	1689	1732	1786	1758	1889	1435
STD	Original	2.357	0.122	0.090	1.269	2.162	0.766	0.423	4.112	669.5	469.3
	A	0.202	0.042	0.008	0.135	0.246	0.198	0.097	0.695	35.66	45.44
	B	0.268	0.079	0.028	0.684	0.682	0.654	0.165	1.115	78.35	82.5
	C	1.857	0.102	0.064	0.789	1.121	0.725	0.221	4.356	98.76	101.5
	D	2.684	0.165	1.35	1.147	1.684	0.754	0.554	4.451	389.2	205.7

Table 3. Distribution of original intensity and corrected intensity

Meijie Yang, Jun Liu. Influence of Distance Factor onthe Scanning Accuracy of Terrestrial Laser[J]. Laser & Optoelectronics Progress, 2020, 57(12): 122804

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