Simple and efficient thermal calibration for MEMS gyroscopes.

Area of Science:

• Sensor Technology
• Mechanical Engineering
• Biomedical Engineering

Background:

• Micro-electro-mechanical systems (MEMS) gyroscopes are crucial for human-movement monitoring in medical applications.
• Temperature variations cause drift in MEMS gyroscopes, impacting measurement accuracy, especially in cost-effective devices.
• Traditional calibration methods are often complex and require expensive equipment.

Purpose of the Study:

• To propose an accessible and straightforward protocol for thermal calibration of MEMS gyroscopes.
• To evaluate the accuracy of the proposed calibration method against traditional manufacturer calibration.
• To identify the primary sources of error in MEMS gyroscope measurements.

Main Methods:

• Developed an easy-to-implement thermal gyroscope calibration protocol.
• Evaluated angular velocity accuracy using an optoelectronic measurement as a reference.
• Compared the proposed calibration's performance against the manufacturer's standard calibration procedure.

Main Results:

• The proposed calibration achieved a Root Mean Square Error (RMSE) of 0.7°/s, outperforming the manufacturer's calibration RMSE of 1.1°/s.
• Uncertainty propagation analysis revealed that offset variability constitutes 97% of the total error in computed rotation rates.
• The simple calibration method demonstrated accuracy comparable to the manufacturer's procedure.

Conclusions:

• The proposed thermal calibration protocol provides an effective and simple solution for enhancing MEMS gyroscope accuracy.
• Offset variability is the dominant error source in the tested MEMS gyroscopes.
• This method offers a viable alternative for achieving reliable gyroscope measurements in medical and other applications.