Vibrometers
Vibrometers includes a family of 3 standard models – a fixed focal length model, an exchangeable lenses model, and a variable focal length model. Each model is discussed in detail below, along with available datasheets.
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 Models:
Laser Vibrometer with Variable Focal Length, LSV-2500-NG
This model offers a manual zoom lens for maximum ease of use and flexibility. Features and benefits include:
- High precision non-contact vibration and length measurement
- Frequency range from 0 Hz to 5 MHz
- Easy adjustment and handling
- Compact device with case for mobile use
- Extensive trigger options
- Infinitely adjustable working distance in the range of 240 mm to 2500 mm
- FFT software for spectral analysis
- Open interfaces for OEM software using Windows and Linux
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.
This model’s wide adjustment range provides significant flexibility in configuring the measurement setup and enables the instrument to be used across a broad variety of applications.
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Sub-set of Datasheet Features
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Laser Vibrometer, Model LSV-2500-NG
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For more details in North America, contact Yuri Toegemann, yuri.toegemann@sios.de
Laser Vibrometer with Fixed Focal Length, LSV-120-NG
This model is ideal for a wide variety of industry and research applications. Features and benefits include:
- High precision non-contact vibration and length measurement
- Easy adjustment and handling
- Compact device with case for mobile use
- Fixed focal length measuring
- Extensive trigger options
- Fixed working distance customized 30…70 mm, 240 mm, 480 mm
- FFT software for spectral analysis
- Open interfaces for OEM software using Windows and Linux
This vibration measurement model has extensive options for triggering measured value recordings, so that the entire measurement sequence can be automated or remotely controlled.
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Sub-set of Datasheet Features
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Laser Vibrometer, Model LSV-120-NG
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For more details in North America, contact Yuri Toegemann, yuri.toegemann@sios.de
Laser Vibrometer with Exchangeable Lenses, LSV-120-NG/L
This universal system is suitable for precise and non-contact vibration measurement on almost all surfaces. Features and benefits include:
- High resolution vibration and length measurement
- Frequency range from 0 Hz to 5 MHz
- Easy adjustment and handling
- Compact and robust design
- Interchangeable selectable focal lengths
- Quick-change external lens switching without tools
- Extensive trigger options
- Changeable working distance from ther sensor head 30…70 mm, 240 mm, 480 mm
- FFT software for spectral analysis
- Open interfaces for OEM software using Windows and Linux
Various digital and analog modules are available for evaluating measurement data and outputting the measured values. With the addition of a three-way tilt head tripod, the sensor can be positioned very quickly and aligned comfortably. Robust air-freight transport cases are available.
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Sub-set of Datasheet Features
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Laser Vibrometer, Model LSV-120-NG/L
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For more details in North America, contact Yuri Toegemann, yuri.toegemann@sios.de
Nano Vibration Analyzer, Model NA
This system for measuring the vibration of microstructures includes the following features and benefits:
- High precision non-contact vibration measurement of micro-objects
- Integrated X-Y stage (50 x 50 mm)
- Easy adjustment and handling
- Microscope objective 10x, 20x 50x
- Spot diameter 2 – 10 µm (Objective dependent)
- OEM integration of vibrometer components is possible
- Extensive trigger options
- FFT software for spectral analysis
- Open interfaces for OEM software using Windows and Linux
This system is a combination of a fiber-coupled vibrometer integrated with an engineering microscope and an X-Y precision stage. This solution is ideal for measuring the dynamic behavior and static deflection of microstructures, MEMS and cantilevers.
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Sub-set of Datasheet Features
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Nano Vibration Analyzer, Model NA
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For more details in North America, contact Yuri Toegemann, yuri.toegemann@sios.de
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