A high-precision wavelength calibration method based on Fourier transform imaging spectrometer

2019 ◽  
Author(s):  
Yixuan Xu ◽  
Jianxin Li ◽  
Caixun Bai ◽  
Jie Liu ◽  
Yi Zong ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Precision ◽  
Calibration Method ◽  
Imaging Spectrometer ◽  
Wavelength Calibration

scholarly journals Iterative local Fourier transform-based high-accuracy wavelength calibration for Fourier transform imaging spectrometer

2020 ◽  
Vol 28 (4) ◽  
pp. 5768
Author(s):  
Yixuan Xu ◽  
Jianxin Li ◽  
Caixun Bai ◽  
Ming Wei ◽  
Jie Liu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Accuracy ◽  
Imaging Spectrometer ◽  
Wavelength Calibration

scholarly journals Habitable Zone Super-Earths with Non-Stabilised Spectrographs

2012 ◽  
Vol 8 (S293) ◽  
pp. 68-70
Author(s):  
Duncan J. Wright ◽  
Christopher G. Tinney ◽  
Robert A. Wittenmyer
Keyword(s):  
High Resolution ◽  
Radial Velocity ◽  
High Precision ◽  
Calibration Method ◽  
Habitable Zone ◽  
Absorption Cell ◽  
M Dwarfs ◽  
Wavelength Calibration ◽  
Atmospheric Changes ◽  
Rocky Planets

AbstractDetecting the small velocity amplitudes (≤ 10 m/s) produced by habitable zone rocky planets around M Dwarfs requires radial velocity precisions of a few m s−1. However, an iodine absorption cell, commonly used as a high precision wavelength reference on non-stabilised spectrographs, is not efficient for very red and faint objects like M Dwarfs. Instead, arc lamps have to be used. With the exception of the ultra-stabilised HARPS spectrograph, achieving ~m s−1 calibration with arc lamps has not been possible because typical spectrographs experience drifts of several hundred m s−1 due to local atmospheric changes in pressure and temperature. We outline and present results from an innovative differential wavelength calibration method that enables ~m s−1 precision from non-stabilised, high-resolution spectrographs. This technique allows the detection of rocky planets with radial velocity amplitudes of a few m s−1.

Industrial part localization and grasping using a robotic arm guided by 2D monocular vision

2018 ◽  
Vol 45 (6) ◽  
pp. 794-804 ◽  
Author(s):  
Zhaohui Zheng ◽  
Yong Ma ◽  
Hong Zheng ◽  
Yu Gu ◽  
Mingyu Lin
Keyword(s):  
Camera Calibration ◽  
High Precision ◽  
Calibration Method ◽  
Monocular Vision ◽  
Robotic Arm ◽  
Robot Arm ◽  
Content Type ◽  
Calibration Algorithm ◽  
Target Locating ◽  
Practical Implications

Purpose The welding areas of the workpiece must be consistent with high precision to ensure the welding success during the welding of automobile parts. The purpose of this paper is to design an automatic high-precision locating and grasping system for robotic arm guided by 2D monocular vision to meet the requirements of automatic operation and high-precision welding. Design/methodology/approach A nonlinear multi-parallel surface calibration method based on adaptive k-segment master curve algorithm is proposed, which improves the efficiency of the traditional single camera calibration algorithm and accuracy of calibration. At the same time, the multi-dimension feature of target based on k-mean clustering constraint is proposed to improve the robustness and precision of registration. Findings A method of automatic locating and grasping based on 2D monocular vision is provided for robot arm, which includes camera calibration method and target locating method. Practical implications The system has been integrated into the welding robot of an automobile company in China. Originality/value A method of automatic locating and grasping based on 2D monocular vision is proposed, which makes the robot arm have automatic grasping function, and improves the efficiency and precision of automatic grasp of robot arm.

Field-of-view analysis of a polarization interference Fourier transform imaging spectrometer

2011 ◽  
Vol 50 (27) ◽  
pp. 5351
Author(s):  
Edward DeHoog ◽  
Xiaowei Xia ◽  
Alexander Parfenov ◽  
Min-Yi Shih
Keyword(s):  
Fourier Transform ◽  
Field Of View ◽  
Imaging Spectrometer

Compact fourier-transform imaging spectrometer for small satellite massions

2003 ◽  
Vol 52 (9-12) ◽  
pp. 803-811 ◽  
Author(s):  
Bernd Harnisch ◽  
Winfried Posselt ◽  
Karin Holota ◽  
Heinz Otto Tittel ◽  
Michael Rost
Keyword(s):  
Fourier Transform ◽  
Small Satellite ◽  
Imaging Spectrometer

scholarly journals A Nonlinear Calibration Method Based on Sinusoidal Excitation and DFT Transformation for High-Precision Power Analyzers

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenjian Zhou ◽  
Sheng Yang ◽  
Li Wang ◽  
Hanmin Sheng ◽  
Yang Deng
Keyword(s):  
High Precision ◽  
Interpolation Method ◽  
Spline Interpolation ◽  
Calibration Method ◽  
Calibration Error ◽  
Initial Moment ◽  
Calibration Process ◽  
Calibration Methods ◽  
Nonlinear Calibration ◽  
Sinusoidal Excitation

For most high-precision power analyzers, the measurement accuracy may be affected due to the nonlinear relationship between the input and output signal. Therefore, calibration before measurement is important to ensure accuracy. However, the traditional calibration methods usually have complicated structures, cumbersome calibration process, and difficult selection of calibration points, which is not suitable for situations with many measurement points. To solve these issues, a nonlinear calibration method based on sinusoidal excitation and DFT transformation is proposed in this paper. By obtaining the effective value data of the current sinusoidal excitation from the calibration source, the accurate calibration process can be done, and the calibration efficiency can be improved effectively. Firstly, through Fourier transform, the phase value at the initial moment of the fundamental frequency is calculated. Then, the mapping relationship between the sampling value and the theoretical calculation value is established according to the obtained theoretical discrete expression, and a cubic spline interpolation method is used to further reduce the calibration error. Simulations and experiments show that the calibration method presented in this paper achieves high calibration accuracy, and the results are compensation value after calibration with a deviation of ± 3 × 10 − 4 .

Sign in / Sign up

Export Citation Format

Share Document