Results 281 to 290 of about 1,287,395 (305)

Tunable, double-wavelength heterodyne detection interferometer for absolute-distance measurements

Optics Letters, 1994
We present a novel absolute-distance meter based on double heterodyne interferometry. The synthetic wavelength is obtained with a pair of tunable Nd:YAG lasers operating at 1.064 μm. The nonambiguity range of the measurement can be arbitrarily extended by subsequent measurements with different synthetic wavelengths.
E. GELMINI, MINONI, Umberto, DOCCHIO, Franco   +2 more
openaire   +3 more sources

Dual-comb Reciprocal Temporal Scanning for Absolute Distance Measurement

CLEO: 2015, 2015
Pulse trains from dual combs with different repetition rates are coupled and directed onto a target for simultaneous absolute distance measurement. Non-ambiguity range extension is immune to drift and accuracy is about 100 nm.
Hongyuan Zhang, Xuejian Wu, Haoyun Wei, Yan Li   +3 more
openaire   +1 more source

Laser-diode FMCW technique applied to absolute distance measurement

SPIE Proceedings, 1993
A new method for measuring absolute distance is described which is based on the frequency modulated continuous wave (FMCV technique. The preliminary experiment results show that the accuracy can reach 0. 3mx at a distance of 7 meters and the measuring range can exceed 10 meters by using an external cavity laser ...
Mang Cao, Dacheng Li, Yongjun Wu
openaire   +1 more source

Multiple-Wavelength Interferometry for Absolute Distance Measurement

1999
Multiple-wavelength interferometry enables an increase in the range of nonambiguity and a reduction in the sensitivity of classical interferometry. It can also be operated on rough surfaces. The accuracy depends on the stability and the calibration of the different wavelengths.
R. Dändliker, Y. Salvadé
openaire   +1 more source

Scheme of shot-noise-limited displacement and absolute distance measurement simultaneously using laser and white light interferometry

Journal of Optics, 2022
Peng Yang, Boya Xie, Xu Ke
semanticscholar   +1 more source

Absolute interferometric distance measurements applying a variable synthetic wavelength

Journal of Optics, 1998
This paper describes the principle and design of a first prototype of an absolute distance interferometer using a variable synthetic wavelength. The major components of the prototype are two piezoelectrically tunable diode lasers with an external cavity, and a mechanical dimensional standard.
Karl-Heinz Bechstein, Werner Fuchs
openaire   +1 more source

Dual-comb absolute distance measurement of non-cooperative targets with a single free-running mode-locked fiber laser

Optics Communications, 2021
Dingtong Hu, Ziling Wu, Hui Cao, Yi Shi, Runmin Li, Haochen Tian, Youjian Song, Minglie Hu   +7 more
semanticscholar   +1 more source

ABSOLUTE LONG DISTANCE MEASUREMENTS IN AIR

2009
The presentation will briefly summarize the objectives and give progress of the joint research project “absolute long distance measurement in air”, elected within the “length” targeted program of the European metrological research program (EMRP). As suggested by its title, the project has the ambition to go beyond the current state of the art in the ...
Wallerand J. P, Abou Zeid A, Badr T, Balling P, Jokela J, Kugler R, Skorpil H, Merimaa M, Poutanen M, Prieto E, van den Berg S, ZUCCO, MASSIMO   +11 more
openaire   +1 more source

Interferometry for Absolute Distance Measurement

Acta Optica Sinica, 2011
李志栋 Li Zhidong, 江月松 Jiang Yuesong, 桑峰 Sang Feng, 王林春 Wang Linchun, 邓士光 Deng Shiguang, 辛遥 Xin Yao, 郭泾平 Guo Jingping   +6 more
openaire   +1 more source

Collinear versus non-collinear autocorrelation between femtosecond pulses for absolute distance measurement

, 2020
Haitham M. Hussein, O. Terra, H. Hussein, Mohamed Medhat   +3 more
semanticscholar   +1 more source