Abstract
Electronic distance meters (EDMs) are widely used in different applications, such as surveying and civil engineering. In order to calibrate an EDM, different techniques can be used, including displacement interferometers and reference baselines. In this paper, an indoor baseline is designed and then accurately measured using femtosecond laser pulses from an optical frequency comb to be used for EDM calibration. The baseline consists of 13 fixed bases that cover 58 m distance. In order to accurately measure the distances between the bases, autocorrelation between femtosecond laser pulses is employed. The measurement shows a maximum precision of 14 µm over the 13 bases. Although this deviation is dominated mainly by the placement of the target mirror, the system capability is much more sufficient to safely calibrate the best available commercial EDM. The stability of the baseline is also investigated by measuring the interbase distances over long periods of time.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Hanzhong Wu, Fumin Zhang, Jianshuang Li, Shiying Cao, Xiangsong Meng, and Xinghua Qu
Appl. Opt. 54(17) 5581-5590 (2015)
Teemu Tomberg, Thomas Fordell, Jorma Jokela, Mikko Merimaa, and Tuomas Hieta
Appl. Opt. 56(2) 239-246 (2017)
Hanzhong Wu, Fumin Zhang, Tingyang Liu, Fei Meng, Jianshuang Li, and Xinghua Qu
Opt. Express 23(24) 31582-31593 (2015)