Laser Doppler Vibrometer Application
Ultrasonic welding machines and ultrasonic processing machines enable amplitude measurement of targets that vibrate at high speeds with frequencies exceeding 20 kHz. Amplitude values and frequency analysis allow for the assessment of welding quality and the determination of maintenance timing for the equipment.
The Laser Doppler Vibrometer, due to its high spatial resolution, can detect the amplitude of electronic components mounted on a circuit board with pinpoint accuracy during vibration tests. It can also confirm cases where components vibrate beyond the specified applied acceleration due to differences in mass among the parts and the vibration modes of the board, resulting in unexpected loads on the components.
The LV-1800, characterized by being load-free and non-contact, is ideal for measuring the amplitude of thin films. It is also capable of measuring the amplitude of transparent films such as the vibration membranes of mobile device microphones, receivers, speaker cones, and films used in LCDs.
The Laser Doppler Vibrometer does not detect transparent objects that are not in the focal position. Utilizing this feature, it is possible to detect the amplitude of objects placed in a vacuum chamber or a temperature-controlled bath by irradiating them with a laser through glass or quartz.
The laser spot diameter of the LV-1800 is approximately Φ20 μm as standard, and it can be narrowed to about Φ3 μm by attaching the LV-0151B objective lens. This high spatial resolution enables inspections of microstructures, such as those found in Micro Electro Mechanical Systems (MEMS), which were previously difficult to achieve.
