scholarly journals Long-range, high-precision, and high-speed absolute distance measurement based on alternately oscillating optoelectronic oscillators

2019 ◽  
Vol 27 (15) ◽  
pp. 21635
Author(s):  
Tianyuan Xie ◽  
Ju Wang ◽  
Zixiong Wang ◽  
Chuang Ma ◽  
Yang Yu ◽  
...  
Keyword(s):  
Long Range ◽  
High Precision ◽  
High Speed ◽  
Distance Measurement ◽  
Absolute Distance ◽  
Optoelectronic Oscillators

Long-range, high-precision absolute distance measurement based on two optoelectronic oscillators

2014 ◽  
Vol 39 (15) ◽  
pp. 4412 ◽  
Author(s):  
Ju Wang ◽  
Jinlong Yu ◽  
Wang Miao ◽  
Bin Sun ◽  
Shi Jia ◽  
...  
Keyword(s):  
Long Range ◽  
High Precision ◽  
Distance Measurement ◽  
Absolute Distance ◽  
Optoelectronic Oscillators

scholarly journals Long-range, high-precision absolute distance measurement technology based on alternately oscillating optoelectronic oscillator

2019 ◽  
Vol 68 (13) ◽  
pp. 130601
Author(s):  
Tian-Yuan Xie ◽  
Ju Wang ◽  
Zi-Xiong Wang ◽  
Chuang Ma ◽  
Yang Yu ◽  
...  
Keyword(s):  
Long Range ◽  
High Precision ◽  
Distance Measurement ◽  
Measurement Technology ◽  
Absolute Distance ◽  
Optoelectronic Oscillator

All Polarization Maintaining Fiber Based Dual-Comb High Precision Absolute Distance Measurement System

2015 ◽  
Vol 35 (s2) ◽  
pp. s212001
Author(s):  
许立明 Xu Liming ◽  
宋有建 Song Youjian ◽  
梁飞 Liang Fei ◽  
师浩森 Shi Haosen ◽  
胡明列 Hu Minglie ◽  
...  
Keyword(s):  
High Precision ◽  
Measurement System ◽  
Distance Measurement ◽  
Absolute Distance ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

A New System of High-Precision Absolute Laser Interferometer Distance Measurement

2013 ◽  
Vol 380-384 ◽  
pp. 769-772
Author(s):  
Chen Yang Zhang ◽  
Bing Li
Keyword(s):  
High Precision ◽  
Laser Scanning ◽  
Laser Interferometer ◽  
Laser Interferometry ◽  
Distance Measurement ◽  
Absolute Distance ◽  
Distance Information ◽  
New Methods ◽  
Interference Fringes ◽  
New System

With the improvement of precision in various fields, we present a new method for the measurement of the absolute distance of a remote target based on the laser interferometry technique. In this paper, we obtain the interference fringes change information (the distance information) with the help of laser scanning with different frequency. It does not require the target to move in the direction of measurement. We have done experiments to compare this new methods results with the results of RENISHAW interferometer. Its improved that the accuracy of distance measurement is 10-4~10-5 relatively.

scholarly journals High-Precision Low-Cost Gimballing Platform for Long-Range Railway Obstacle Detection

Sensors ◽  
2022 ◽  
Vol 22 (2) ◽  
pp. 474
Author(s):  
Elio Hajj Assaf ◽  
Cornelius von von Einem ◽  
Cesar Cadena ◽  
Roland Siegwart ◽  
Florian Tschopp
Keyword(s):  
Long Range ◽  
High Precision ◽  
High Speed ◽  
Detection System ◽  
Low Cost ◽  
Obstacle Detection ◽  
Numerical Control ◽  
Railway Network ◽  
Lever System ◽  
Novel Approach

Increasing demand for rail transportation results transportation by rail, resulting in denser and more high-speed usage of the existing railway network, making makes new and more advanced vehicle safety systems necessary. Furthermore, high traveling speeds and the greatlarge weights of trains lead to long braking distances—all of which necessitates Long braking distances, due to high travelling speeds and the massive weight of trains, necessitate a Long-Range Obstacle Detection (LROD) system, capable of detecting humans and other objects more than 1000 m in advance. According to current research, only a few sensor modalities are capable of reaching this far and recording sufficiently accurate enoughdata to distinguish individual objects. The limitation of these sensors, such as a 1D-Light Detection and Ranging (LiDAR), is however a very narrow Field of View (FoV), making it necessary to use ahigh-precision means of orienting to target them at possible areas of interest. To close this research gap, this paper presents a novel approach to detecting railway obstacles by developinga high-precision pointing mechanism, for the use in a future novel railway obstacle detection system In this work such a high-precision pointing mechanism is developed, capable of targeting aiming a 1D-LiDAR at humans or objects at the required distance. This approach addresses To address the challenges of a low target pricelimited budget, restricted access to high-precision machinery and equipment as well as unique requirements of our target application., a novel pointing mechanism has been designed and developed. By combining established elements from 3D printers and Computer Numerical Control (CNC) machines with a double-hinged lever system, simple and cheaplow-cost components are capable of precisely orienting an arbitrary sensor platform. The system’s actual pointing accuracy has been evaluated using a controlled, in-door, long-range experiment. The device was able to demonstrate a precision of 6.179 mdeg, which is at the limit of the measurable precision of the designed experiment.

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