Laser Doppler vibrometer

A vibrometer (short for laser Doppler vibrometer ) is a measuring instrument for the quantification of mechanical vibrations. It measures the vibration velocity of an object.

Vibrometer includes a laser which is focused on the surface to be measured. Due to the Doppler effect shifts during movement of the surface to be measured, the frequency of the backscattered laser light. This frequency shift is evaluated in by means of a vibrometer interferometer, and output as a voltage signal or a digital data stream. A scanning vibrometer allows for field measurement of vibrations.

Application

Vibrometer are used in a variety of scientific, industrial and medical fields. Here are some examples:

• Aerospace - vibrometer are used as tools for nondestructive inspection of aircraft components.
• Acoustics - Vibrometer are standard tools for the design of loudspeakers. In addition, they have been used to detect the oscillation behavior of musical instruments.
• Architecture - vibrometer is used to detect the oscillation behavior of buildings and bridges ( bridge maintenance).
• Automotive engineering - Measurement of vibration modes of individual components or complete vehicles.
• Particle velocity measurement: A sound velocity brings a thin film to vibrate. This vibration of the slide is measured with a laser Doppler vibrometer, and the sound pressure is determined therefrom.
• Biology - vibrometer was used for example for examination of the eardrum in the ear, or to the visualization of the insect communication.
• Calibration - Since vibrometer be calibrated in relation to the wavelength of light, it uses it to calibrate other measuring instruments.
• Hard Drives - Vibromter have already been used for the study of hard drives, especially in the positioning of the read head.
• Find Landmines - Vibrometer have shown that they can detect buried landmines. A noise source, such as a speaker, stimulate the floor for minimal overshoot. These vibrations are detected by the vibrometer. The soil over a buried landmine shows another oscillating behavior as a floor without a land mine. Mine detection with single-beam vibrometers, an array of vibrometers, and multi-beam vibrometers has already been carried out successfully.
• Safety - Based on your property of non-contact vibration measurement, Vibromter are also suitable for capturing voices over long distances. Using a visual sensor (camera ), the Vibromter directed to a sound - reflecting surface in the vicinity of the target, to absorb the acoustic signals.