Multi-beam heterodyne laser Doppler vibrometer based on a line-scan CMOS digital camera

Area of Science:

• Optical Measurement Techniques
• Vibration Analysis
• Instrumentation Engineering

Background:

• Multi-beam laser Doppler vibrometers (MB-LDVs) offer faster measurements and better transient event analysis compared to single-beam systems.
• Existing MB-LDVs face limitations in the number of measurement points due to complex and costly electronic hardware.

Purpose of the Study:

• To develop a novel MB-LDV system that reduces hardware complexity and increases simultaneous measurement points.
• To leverage high-speed line-scan CMOS camera technology for enhanced MB-LDV capabilities.

Main Methods:

• Development of a multi-beam laser Doppler vibrometer system.
• Integration of a digital line-scan CMOS camera for data acquisition.
• Simultaneous vibration measurement on a linear array of 99 points.

Main Results:

• Successfully implemented an MB-LDV system utilizing a line-scan CMOS camera.
• Achieved simultaneous vibration measurement at 99 discrete points.
• Demonstrated a reduction in hardware complexity compared to traditional MB-LDV designs.

Conclusions:

• The developed MB-LDV system effectively increases the number of measurement channels.
• Utilizing line-scan CMOS cameras is a viable approach to overcome hardware limitations in MB-LDVs.
• This technology enables more efficient and comprehensive vibration analysis.