# Evaluation of the Large-Length Indoor Standard Installation Based on Single Point Scanning
## 4 Results and Analysis
### Comparative Analysis of Multiple Measurement Results  
Figure 3 shows the results of 10 multiple measurements of the laser tracker with a measurement interval of 5000 mm. The ten groups of data show great similarity, reflecting  
Figure 2: Single measurement results with a measurement interval of 5000 mm. good data repeatability. Due to an error in the initial position in the experimental, there were differences in the total number of points of each measurement. Table 2 shows the results of 10 measurements of the laser tracker with a measurement interval of 5000 mm and a nominal speed of 150 mm/s. According to the data, the local average speed was stable within a distance range of 5000 mm, which was between 149.9978 mm/s and 149.9988 mm/s for the ten measurements. The number of measurement points that met the requirements ranged 312-317, and the maximum time of the movement was 35.9 s, and the average time was 35.7 s.  
Table 3 shows the results of the laser tracker at different measurement intervals and speeds. With an interval of 100 mm, and the nominal speeds were 100 m/s and 150 mm/s, and the measurement speed did not reach the set value, thus there was not a constant speed stage. Under the same measurement intervals, the greater the nominal speed, the greater the absolute value of the difference between the actual speed and the nominal speed. The last row in Table 3 is the summary of data in Table 2. When the measurement interval and the speed was 5000 mm and 150 mm/s, the average time of the 10 measurements was 31.4 s and 35.7 s in the constant speed stage and the whole movement period, and the maximum time of the movement period was 35.9 s. The local average speed of multiple measurements is \(\
abla=\frac{\sum_{\mathrm{t}}^{n}\mathrm{v}_{\mathrm{t}}}{\sum_{\mathrm{t}}^{n }\mathrm{i}}\), where \(n=10\), \(\mathrm{v}_{\mathrm{t}}\) is the local average speed in the ith measurement, \(\mathrm{t}_{\mathrm{i}}\) is the time of the constant speed stage in the ith measurement, and the value of \(\mathrm{i}\) is from 1 to 10, and the calculation of the global average speed was the same. When the nominal speed was 100 mm/s and the measurement interval was 100 mm, the measurement requirement was not met, leading to the loss of measurement results and the difficulty in determining the measurement boundary. In the last two columns of Table 3, when the measurement interval was the same, the greater the nominal speed, the shorter the total time in the whole movement period. In addition, when the nominal speed was 150 mm/s with an interval of 5000 mm, the average time in the whole movement period was 35.7 s, and the maximum \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Time (s)**} & **Time of the** & **Mean Value** & **Time of the** & **Global** & & **Time of the** & **Mean Value** & **Time of the** & **Global** \\  & **Constant** & **of Local** & **Movement** & **Average** & **Speed** & **Time (s)** & **Constant** & **of Local** & **Movement** & **Average** \\  & **(s)** & **(mm/s)** & **Period (s)** & **(mm/s)** & **(s)** & **(mm/s)** & **Period (s)** & **(mm/s)** & **Period (s)** & **Speed** \\ \hline
1 & 31.3 & 149.9985 & 35.9 & 139.2755 & 6 & 31.4 & 149.9985 & 35.8 & 139.6646 \\
2 & 31.1 & 149.9979 & 35.8 & 139.9945 & 7 & 31.3 & 149.9980 & 35.6 & 140.449 \\
3 & 31.7 & 149.9982 & 35.6 & 140.4493 & 8 & 31.2 & 149.9988 & 35.5 & 140.848 \\
4 & 31.5 & 149.9978 & 35.6 & 140.4492 & 9 & 31.3 & 149.9988 & 35.4 & 141.2427 \\
5 & 31.5 & 149.9984 & 35.4 & 141.2428 & 10 & 31.2 & 149.9984 & 35.9 & 139.2754 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Results of ten measurements of the laser tracker with a measurement interval of 5000 mm. Figure 3: Results of ten measurements with a measurement interval of 5000 mm. time was 35.9 s. The average time and the maximum time in the movement period can be an important reference basis for the measurement of LLISI.