Frequently Asked Questions about Laser Doppler Vibrometer

For measurements, it is necessary for the reflected laser light to return. Therefore, transparent objects or those that absorb the laser beam (often matte black) cannot be measured.
Unfortunately, it is necessary to attach a reflection mark to such items. Additionally, for items with a mirror finish, if the target surface is directly facing the sensor axis and the laser hits it, it will yield the best S/N ratio measurement; however, if it hits at an angle, data cannot be obtained.
If it is absolutely necessary to hit the laser beam at an angle, it is still required to attach a reflection mark. If a reflection mark is attached, measurements can be taken at angles up to about 45°. However, the LV series only measures the vibrational components in the direction of the sensor axis, so it will be a measurement of vibration in that vector direction.

For the LV-1100/1600 series, the amount of reflected light can be confirmed using the indicator on the main unit.