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Laser Vibrometer: Precise vibration measurement
Laser vibrometers for high-precision, non-contact technology in a wide range of applications
A laser vibrometer is a high-precision measuring device for non-contact measurement of mechanical vibrations. By using laser Doppler vibrometry (LDV), it provides accurate measurement of frequencies and amplitudes of object vibrations. This technology is used in a variety of scientific, industrial and medical applications and sets new standards in vibration measurement technology.
How laser Doppler vibrometry works
Laser Doppler vibrometry is based on the principle of the Doppler effect. A laser beam is focused on the surface to be measured. If the surface moves, the frequency of the reflected laser light changes. This frequency shift is analyzed using an interferometer and converted into a voltage signal or a digital data stream.
The core of a laser vibrometer is the interferometer, which uses optical interference to measure the movements of the surface. A measurement beam and a reference beam are superimposed. Movements of the measurement object generate characteristic light-dark patterns on the detector, which are used to determine the vibration speed and direction.
Types of laser vibrometers
Single-point laser vibrometers
These devices measure the vibrations at a single point. They are ideal for simple and fast measurements in modal analysis and quality assurance. One example is the SMART Single+, which enables precise and efficient measurement thanks to its compact design and user-friendly operation.
Scanning laser vibrometers
These devices use computer-controlled mirrors to direct the laser beam over the measurement object. This enables measurement at several points and the creation of detailed vibration maps. The laser beam is deflected by two mirrors, which are controlled by the computer, making it possible to measure vibrations over a large area.
Advantages of the laser vibrometer
Non-contact and non-reactive: As the measuring method does not require physical contact, the object being measured is not affected.
High precision: Laser vibrometers enable measurements in the range from femtometers up to very high frequencies of up to 6 GHz.
Wide range of applications: From microstructure analysis to monitoring large structures such as bridges and buildings.
Robustness and adaptability: Modern devices are suitable for use in different environments, including vacuum chambers and under extreme conditions.
Applications of laser vibrometers
Industry: Monitoring and quality assurance in production processes, analysis of machine vibrations. Laser vibrometers are essential for detecting irregularities and ensuring product quality.
Research and development: Investigation of material properties, vibration analysis in electronics and microstructure technology. These devices enable the precise characterization of MEMS (micro-electro-mechanical systems) and other sensitive structures.
Medicine: diagnosis and testing of medical devices, examination of biological structures such as the eardrum. The non-contact measurement method is particularly advantageous for tests on living organisms.
Automotive industry: NVH analysis (noise, vibration, harshness), investigation of the vibration modes of vehicle components. Laser vibrometers help to improve the acoustics and comfort of vehicles.
Aerospace: Non-destructive testing of aircraft components, vibration analysis of satellites and spacecraft. The technology is used to ensure the structural integrity and reliability of aircraft and spacecraft.
Civil engineering: Monitoring the vibrations of buildings and bridges, detecting structural weaknesses. Laser vibrometers can help to extend the service life of structures and ensure their safety.
Future prospects and innovations
Modern laser vibrometers integrate advanced technologies and offer user-friendly, compact devices that combine the entire laboratory environment in a single system. These systems use innovative interferometer designs to ensure maximum precision and efficiency and allow customization to specific customer requirements.
Continuous development in laser vibrometry eliminates noise and significantly improves optical sensitivity, enabling more accurate measurements on all surfaces. Recent developments such as Optomet's SMART series set new standards in vibration measurement technology by integrating smart technologies and modular systems that allow for customized configuration.
The perfect partner for vibration measurement technology
Laser vibrometers are indispensable tools in modern vibration measurement technology. Their ability to measure precisely and without contact makes them an essential instrument in many scientific and industrial applications. As technology continues to advance, laser vibrometers will continue to set new standards in measurement technology and expand their range of applications. Their versatility and high precision make them a key tool for future innovations in various industries.
Further topics on basics & measurement technology
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