Laservibrasjonsmåling

Laservibrasjonsmåling, also known as laser Doppler vibrometry (LDV), is a non-contact optical measurement technique used to determine the vibration characteristics of a surface. It operates by employing the Doppler effect, where the frequency of a laser beam changes when it reflects off a moving object. A laser beam is directed at the surface of interest, and the reflected light is analyzed. If the surface is vibrating, the reflected light will be frequency-shifted due to the Doppler effect. The magnitude of this shift is directly proportional to the velocity of the surface vibration. By measuring this frequency shift, the velocity, displacement, and acceleration of the vibration can be accurately calculated. LDV systems typically consist of a laser source, optics for focusing and collecting the reflected light, and a photodetector and signal processing unit to measure the frequency shift. This technology is advantageous due to its non-contact nature, eliminating the need for physical attachment of sensors that could influence the vibration being measured. It offers high sensitivity, excellent resolution, and the ability to measure vibrations at very small amplitudes. Laservibrasjonsmåling finds applications in various fields, including structural health monitoring, acoustics, automotive engineering, aerospace, and microelectronics for diagnosing faults, analyzing material properties, and ensuring product quality.