Shock Measurements Based on Pendulum Excitation and Laser Doppler Velocimetry: Primary Calibration by SI-Traceable...

Area of Science:

• Metrology
• Mechanical Engineering
• Instrumentation

Background:

• Shock measurement systems require precise calibration for accurate data acquisition.
• Laser Doppler velocimetry (LDV) is a key technology in dynamic measurements.
• Existing calibration methods may have limitations in accuracy and traceability.

Purpose of the Study:

• To develop and validate a primary calibration method for shock measurements.
• To assess the accuracy and uncertainty of a shock measurement system using LDV.
• To improve the traceability and reliability of shock acceleration data.

Main Methods:

• Utilized a pendulum excitation system and laser Doppler velocimetry (LDV).
• Measured rigid block displacement in a Teflon channel via LDV and integrated velocity data.
• Compared LDV-derived displacement with SI-traceable length measurements (rulers, calipers).

Main Results:

• The novel calibration method demonstrated high agreement with independent measurements (within ±0.3%).
• Agreement improved to ±0.1% for accelerations exceeding 10,000 m/s².
• A comprehensive uncertainty analysis accounted for random and systematic errors.

Conclusions:

• The described method provides a reliable primary calibration for shock measurement systems.
• This technique enhances the accuracy and SI-traceability of shock acceleration data.
• The findings support the use of LDV in high-accuracy dynamic measurements.