PSV-A-440 Optical Derotator
Non-contact Vibration Measurement on Rotating Objects
The PSV-A-440 Optical Derotator makes it simple to perform non-contact vibration measurements on rotating parts with laser vibrometers. Order analysis and measurement of operational deflection shapes at rotational speeds of up to 24.000 RPM can be realized without the necessity of complex telemetry or the interference of sensor mass. The actual measurement is amazingly simple, as optics rotating at the same RPM freeze the motion of the object. This means that rotating objects, such as fan impellers for consumer products and vehicles, rotors, turbines or tires, can be measured as if at rest.
The convenient and non-contact mapping of operational deflection shapes is a specialty of Polytec’s Laser Scanning Vibrometers. Now even rotating objects such as fans for consumer products and vehicles, turbines or tires can be characterized under operational conditions up to 24,000 RPM.
The actual deflection shapes and resonant frequencies due to stiffening effects at high RPM are measured and can be taken into account in the validation process of FE models. By means of the Optical Derotator order analysis and vibration measurement become feasible in a simple manner. Telemetry systems become unnecessary. Sophisticated control electronics track the motion of the rotating object, resulting in a steady position of the laser beam. The actual measurement is astonishingly simple. Due to the synchronized speed of the derotator the object appears to stand still.
The PSV-A-440 Optical Derotator is supplied either as an add-on for PSV-400 Scanning Vibrometers or as a complete solution comprising the rotating unit with encoder input, a control unit, an adjustable base frame for angular and height adjustment, a PSV-400 Scanning Vibrometer and a single-point reference laser. A software module installed in the Data Management System of the PSV allows easy configuration of the derotator for dynamic run–up tests and static tests.
- Accurate data from measurements made under real operating conditions
- Real operational deflection shapes are measured and thus sources for failure can be visualized
- Run-up and run-down measurements for convenient order analysis without instrumentation
- No telemetry necessary
- Compatible with all PSV-400 Scanning Vibrometers
- Easy synchronization with popular encoder signals