Polytec: PSV-400-3D-M High Frequency Scanning Vibrometer

Acquire and Analyze Vibrations in Three Dimensions

The PSV-400-3D-M Scanning Vibrometer is designed as a specialized tool for ultrasonic and NDT applications. Measurement data are reliable if they reflect the actual vibration characteristics of the real object. This is precisely what the non-contact method guarantees. With its advanced technology and high-performance measurement, analysis and presentation software, the PSV-400-3D-M allows you to easily investigate solutions to ultrasonic actuator dynamic issues in research and development.

Fast, precise, non-contact three-dimensional measuring technique
High spatial resolution
Up to 1 MHz bandwidth for ultrasonic applications
Complete acquisition of the three-dimensional vibration vectors
Clear separation of the out-of-plane and in-plane components in 3-D-animation
Use of either imported geometry data or interactively created scan mesh
Simple calibration of the sensor head´s position in the object’s coordinate system
Export of data in UFF and other formats for processing in modal analysis systems

Data suitable for convenient FE model update
Perfect to ensure safe operation by the indentification of mode coupling in ultrasonic tools
Easy and intuitive to operate
Non-contact and surface independent
Dynamics and geometry – the entire measurement task in 3-D
Inegrated visualization tools for 3-D defelction shapes
Cost-effective and seamless integration into the CAE world by import and export filters for geometry and vibration data
Dynamic strain extension available for durability tasks

Polytec's PSV-400-3D is based on the technology of our well-established PSV (Polytec scanning Vibrometers). By using three independent scanning vibrometer sensor heads and controllers, vibration velocity measurements are made simultaneously from three different directions for each respective sample point. The three sensors are controlled centrally by the PSV measurement and control software. Knowing the geometry of the measurment object, the x,y, and vibration components can be calculated from the angles of incidence of the lasers. The results can be directly compared with conventional contact triax accelerometers.

Performing a typical measurement involves these simple steps:

Position the sensor heads in front of the object to be measured
Train the space coordinate system
Define the sample points on the object
Set the parameters for analog and digital acquisition of measurement values
Start the scan
Evaluate and/or export the data

Rigid support for three PSV-I-400 scan heads. The angle between the scan heads is optimized and balanced for resolution of all vibrational components (in-plane and out-of-plane). Support for A-CAZ-1000 camera.

The tripod is an essential accessory for the measurment of small parts and very helpful for dynamic strain measurments with the PSV-400-3D.

External digital camera with macro zoom lens for the PSV-400-3D and PSV-400-3D-M. Allows precise measurement point definition on small samples. Provides higher resolution than the internal camera of the PSV-I-400 for small objects and short working distances.

Resolution 1034 x 779 pixels
monochrome
C-mount
1/4" thread adapter for tripod mounting

Includes a 1/3" C-mount macro zoom lens

Focal length 8.5 mm - 90 mm
Minimum working distance 178 mm
Smallest field-of-view 6 x 8 mm

Mounting adapters are provided also for the tripod systems PSV-A-T31 and PSV-A-T34 tripod systems.

Laser-based distance sensor for the direct acquisition of 3-D geometry data. The Geometry Scan Unit comprises an optical distance sensor and full software integration with the PSV program (version 8.2 onwards) and it extends the capabilities of the PSV-I-400 scanning head to work as a 3-D geometry acquisition system. Attached to the PSV-I-400 scanning head it measures the x, y and z component of every defined measurement point or reference point. The Geometry Scan Unit includes software modules with the following features:

User-defined object coordinate system
Single-shot distance measurement
Scanning distance measurement
Visualization of geometry with overlaid vibration data
Definition of reference points for 3-D alignment (PSV-400-3D)
Geometry data export to UFF files

On smaller objects a software solution based on image processing is availble for PSV-400-3D systems: VideoTriangulation.

Not available for the PSV-400-B Basic Scanning Vibrometer.

Software Option for PSV Software (version 8.6 or higher) optimizing the measurement point geometry with the PSV-400-3D and PSV-400-3D-M by image processing. Boosts the accuracy of the geometry measurement of the Geometry Scan Unit PSV-A-420 especially for small objects, for high-frequency measurement and for strain measurement. With small objects and in conjunction with the optional external A -CAZ-1000 high-resolution video camera the performace is high enough to replace the Geometry Scan unit.

The precision of the PSV-400-3D and PSV-400-3D-M is determined not only by the precision of the sensor, but also by a precise definition of the postion of the three sensor heads in space. The procedure to aquire this specific information, called 3-D alignment is supported for high-precision or high-frequency measurements by this reference object. It features a tripod adapter for VIB-A-T02 tripods for convenient positioning and adjustment in front of the actual measurement object.

Precisely machined and marked reference points with known coordinates and a well-balanced distribution of these marks in space allow a precisely defined basic alignment of the PSV-3D measurement system for perfect results.

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General System Specifications

Bandwidth	0 – 1 MHz
Velocity range	0.01 µm/s ... 10 m/s
Working distance	> 0.04 m (depending on front optics)
Laser wavelength	633 nm (red)
Laser safety class	Class II He-Ne laser, 1 mW per sensor, eye-safe
Scanner resolution	± 0.002°
Sample size	Several mm² up to m² range