Vibrometers
Vibrometers includes a family of 3 standard models – a fixed focal length model, an exchangeable lenses model, and a variable focal length model.
These vibrometers deliver high precision non-contact vibration and length measurement. They are easily adjustable and include a transport case for mobile use.
These systems are ideal for quality control, development, science/research, and OEM applications.
Model features includes: The ability for non-contact vibration measurement on surfaces of any roughness, determination of vibration spectra, determination of vibration modes by point scanning of the surface (hardware extension necessary), determination of natural frequencies on micro-objects and macroscopic components, multi-coordinate measurements with multiple systems, fixed installation and integration into customer superstructures, and high-precision length measurements.
Laser‑interferometric vibrometers operate on the principle of a Michelson interferometer. In this setup, a coherent laser beam is divided into two paths: a reference beam and a measurement beam.
The reference beam travels along a fixed optical path, while the measurement beam is directed onto the surface being tested. As the surface moves, the length of the measurement beam’s path changes. When the reflected measurement beam returns, it recombines with the reference beam, and the two interfere. The resulting phase difference between them is directly proportional to the displacement of the surface.
Because the laser’s frequency provides a stable, linear scale, the measured phase shift can be accurately converted into standardized units of displacement.
Optimized vibrometers for optically rough surfaces
Laser‑interferometric vibrometers are a specialized type of interferometer designed to measure vibration on optically rough surfaces. Their defining feature—setting them apart from other interferometric length‑measurement systems—is the use of a lens that focuses the measurement beam directly onto the target point. When the beam reflects off a rough surface, it produces a speckle pattern, and the sensor head is engineered to maintain a strong signal‑to‑noise ratio even under these conditions.
Because the beam is focused, the usable measurement range is limited to a few millimeters, depending on the surface’s reflectivity. In vibration analysis this constraint is rarely an issue, since vibration amplitudes are typically very small. Within this limited range, the vibrometer can also perform standard displacement measurements effectively.
Vibrometers - Featured System. Additional Models are available.
Vibrometers
These models offer the following features:
- Measurable object frequency of 0…5 MHz
- Resolution of 5 picometers
- Laser wavelength of 632.8 nm
- Operating temperature range of 15…30˚ C
- Multiple trigger options
Helium–neon (He–Ne) lasers are used as the light source for length and vibration measurements because their high coherence and excellent frequency stability make them ideal for precision metrology. In the LSV‑NG series vibrometers, the measuring head is connected via a fiber‑optic cable, keeping the head compact and protecting it from thermal radiation.
The sensor head includes a reference mirror that can be modulated to simplify calibration and enhance overall performance. Two versions of the vibrometer are available: one with a fixed‑focal‑length lens and another with a zoom lens for adjustable beam focusing.
The zoom version allows the distance between the measuring head and the measurement point to be freely set between 24 cm and 2.5 m. This wide adjustment range provides significant flexibility in configuring the measurement setup and enables the instrument to be used across a broad variety of applications.
North American Office Contact: Yuri Toegemann, yuri.toegemann@sios.de
Discover more Displacement and Measurement Products:
in cooperation with:
SIOS Meßtechnik GmbH (SIOS)
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