Quasi-Static Calibration Method of a High-g Accelerometer

Area of Science:

• Measurement Science
• Mechanical Engineering
• Physics

Background:

• Resonance during quasi-static calibration poses challenges for high-g accelerometers.
• Existing calibration theories may not adequately address high-frequency accelerometer dynamics.

Purpose of the Study:

• To develop an improved quasi-static calibration method for high-g accelerometers.
• To determine the relationship between minimum excitation pulse width and accelerometer resonant frequency.
• To achieve accurate calibration for accelerometers with high resonant frequencies.

Main Methods:

• Derived the relationship between minimum excitation pulse width and resonant frequency using a second-order accelerometer model.
• Established a quasi-static calibration system utilizing a gas gun for acceleration generation and a laser interferometer for signal reproduction.
• Compared excitation acceleration signals with accelerometer output responses to determine impact sensitivity.

Main Results:

• Developed a calibration system generating acceleration signals with pulse widths under 1000 μs.
• Successfully performed quasi-static calibration for high-g accelerometers with resonant frequencies exceeding 20 kHz.
• Achieved a calibration error of 3% for the tested accelerometers.

Conclusions:

• The improved quasi-static calibration theory and system effectively overcome resonance issues in high-g accelerometer calibration.
• This method allows for precise calibration of high-frequency accelerometers, expanding their reliable operational range.
• The findings contribute to more accurate dynamic measurements in high-g environments.