scholarly journals An On-Orbit Dynamic Calibration Method for an MHD Micro-Angular Vibration Sensor Using a Laser Interferometer

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4291
Author(s):  
Yingjie Wu ◽  
Xingfei Li ◽  
Fan Liu ◽  
Ganming Xia
Keyword(s):  
Laser Interferometer ◽  
Calibration Method ◽  
Vibration Sensor ◽  
Absolute Calibration ◽  
Dynamic Calibration ◽  
Calibration System ◽  
Angular Vibration ◽  
Lift Off ◽  
Orbit Dynamic ◽  
Dynamic Calibration Method

The magnetohydrodynamic (MHD) micro-angular vibration sensor is a significant component of the MHD Inertial Reference Unit (MIRU) and measures micro-amplitude and wide frequency angular vibration. The MHD micro-angular vibration sensor must be calibrated in orbit since the ground calibration parameters may change after lift-off. An on-orbit dynamic calibration method for the MHD micro-angular vibration sensor is proposed to calibrate the complex sensitivity of the sensor in high frequency. An absolute calibration method that combines a homodyne laser interferometer and an angular retroreflector was developed. The sinusoidal approximation method was applied, and the calibration system was established and tested using a manufactured MHD sensor. Furthermore, the measurement principle and installation errors were analyzed, including the eccentric installation error of the retroreflector, the tilt installation error of the retroreflector, and the optical path tilt error. This method can be realized within a rotation range of ± 3 ∘ and effectively avoid the installation error caused by mechanical errors. The results indicate that the calibratable angular vibration frequency range is 25–800 Hz, and the angular velocity range is 0 . 076 –7590 mrad/s. The expanded uncertainties of the sensitivity amplitude and phase shift of the calibration system for the MHD micro-angular sensor are 0 . 04 % and 1 . 2 ∘ ( k = 2 ) .

scholarly journals A Dynamic Calibration Method of Installation Misalignment Angles between Two Inertial Navigation Systems

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2947
Author(s):  
Ming Hua ◽  
Kui Li ◽  
Yanhong Lv ◽  
Qi Wu
Keyword(s):  
Autonomous Navigation ◽  
Inertial Navigation ◽  
Calibration Method ◽  
Measurement Information ◽  
Dynamic Calibration ◽  
Navigation Systems ◽  
Inertial Navigation Systems ◽  
Additional Information ◽  
Two Systems ◽  
Dynamic Calibration Method

Generally, in order to ensure the reliability of Navigation system, vehicles are usually equipped with two or more sets of inertial navigation systems (INSs). Fusion of navigation measurement information from different sets of INSs can improve the accuracy of autonomous navigation effectively. However, due to the existence of misalignment angles, the coordinate axes of different systems are usually not in coincidence with each other absolutely, which would lead to serious problems when integrating the attitudes information. Therefore, it is necessary to precisely calibrate and compensate the misalignment angles between different systems. In this paper, a dynamic calibration method of misalignment angles between two systems was proposed. This method uses the speed and attitude information of two sets of INSs during the movement of the vehicle as measurements to dynamically calibrate the misalignment angles of two systems without additional information sources or other external measuring equipment, such as turntable. A mathematical model of misalignment angles between two INSs was established. The simulation experiment and the INSs vehicle experiments were conducted to verify the effectiveness of the method. The results show that the calibration accuracy of misalignment angles between the two sets of systems can reach to 1″ while using the proposed method.

Dynamic Calibration Method for Instrumented Laparoscopic Surgical Graspers1

2014 ◽  
Vol 8 (3) ◽  
Author(s):  
Michael Winek ◽  
Robert Sweet ◽  
Timothy M. Kowalewski
Keyword(s):  
Calibration Method ◽  
Dynamic Calibration ◽  
Dynamic Calibration Method

A Dynamic Calibration Method for Crusher Gauges Based on Material Testing

2007 ◽  
Vol 32 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Heli Nyberg ◽  
Veli-Tapani Kuokkala ◽  
Jari Rämö ◽  
Aulis Järviniemi
Keyword(s):  
Calibration Method ◽  
Material Testing ◽  
Dynamic Calibration ◽  
Dynamic Calibration Method

Laser interferometer calibration system for extensometers

1968 ◽  
Vol 58 (5) ◽  
pp. 1379-1383
Author(s):  
G. Hade ◽  
M. Conner ◽  
J. T. Kuo
Keyword(s):  
Laser Interferometer ◽  
Michelson Interferometer ◽  
Low Frequency ◽  
Calibration Method ◽  
Linear Range ◽  
Laser Source ◽  
Calibration System ◽  
Frequency Oscillator ◽  
Transducer Output ◽  
Optical Calibration

Abstract A laser interferometer technique has been developed for calibrating extensometers at the Ogdensberg Station of Lamont Geological Observatory. It provides remotecontrolled calibration of both horizontal and vertical extensometers within the linear range of the transducer output. The present calibration system consists of an electromagnetic driving unit and a Michelson interferometer. The transducer end of the extensometer is displaced longitudinally with an electromagnetic driving unit, which is excited by a variable low-frequency oscillator with a bandwidth of 0.0005 to 60 kHz. The resultant displacement is detected by counting fringe displacements of the interferometer with an Ne-He laser source. With this calibration system, motion as small as 0.03 micron can be determined with excellent repeatability and with errors of less than 5 per cent, in comparison with errors of more than 40 per cent for the optical calibration method previously used.

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