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Instrument Calibration

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
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An On-Orbit Dynamic Calibration Method for an MHD Micro-Angular Vibration Sensor Using a Laser Interferometer.

Yingjie Wu¹, Xingfei Li², Fan Liu³

¹State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. wuyingjie666@tju.edu.cn.

Sensors (Basel, Switzerland)

|October 19, 2019

Summary

This summary is machine-generated.

An on-orbit calibration method was developed for magnetohydrodynamic (MHD) micro-angular vibration sensors, crucial for space applications. This method accurately calibrates sensor sensitivity in orbit, ensuring reliable performance of the MHD Inertial Reference Unit (MIRU).

Keywords:

MHD installation error laser interferometer micro-angular vibration sensor on-orbit dynamic calibration sensitivity

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Area of Science:

Space instrumentation
Vibration sensing technology
Metrology

Background:

Magnetohydrodynamic (MHD) micro-angular vibration sensors are vital for MHD Inertial Reference Units (MIRUs).
On-orbit calibration is essential as ground calibration parameters can drift post-launch.
Accurate calibration is required for micro-amplitude, wide-frequency angular vibration measurements in space.

Purpose of the Study:

To propose and validate an on-orbit dynamic calibration method for MHD micro-angular vibration sensors.
To calibrate the complex sensitivity of the sensor at high frequencies.
To address and mitigate installation errors in the calibration system.

Main Methods:

Developed an absolute calibration system using a homodyne laser interferometer and angular retroreflector.
Applied the sinusoidal approximation method for dynamic calibration.
Analyzed measurement principles and installation errors (eccentricity, tilt, optical path tilt).

Main Results:

The calibration system was established and tested with a manufactured MHD sensor.
The method is effective within a rotation range of ± 3 degrees, avoiding mechanical installation errors.
Achieved a calibratable angular vibration frequency range of 25-800 Hz and angular velocity range of 0.076-7590 mrad/s.
Expanded uncertainties for sensitivity amplitude and phase shift were 0.04% and 1.2° (k=2), respectively.

Conclusions:

The proposed on-orbit dynamic calibration method is feasible and accurate for MHD micro-angular vibration sensors.
The system effectively mitigates installation errors, ensuring reliable calibration in space.
This method enhances the performance and reliability of MIRUs in space missions.