OFV-551 Fiber-Optic Interferometer  - Features

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Polytec Laser Doppler Vibrometers  are precision tools for non-contact vibration measurement.  Designed to be quick, easy to operate and free from cross-talk or feedback problems, these instruments determine a structure's velocity and displacement from the Doppler shift of back-scattered laser light. Fiber-optic LDV systems allow the user to point the measurement laser beam via a flexible cable terminated by a mini-lens.

Fiber-optic vibrometers simplify vibration measurement where physical access is difficult, close stand-off-distances are required, and when relative motions between two points need to be measured. The sensor heads utilize flexible fiber-optics and an output lens to deliver the laser probe to the measurement point and to collect the reflected light as an input to the interferometer. This design allows for fiber-optic cables with diameters as small as 5 mm and lenses that focus the laser down to a 3 µm diameter spot. A special, dual-fiber design (OFV-552) permits the direct measurement of differential movements between  two monitored  points. The flexibility and small size of the fiber delivery enables measurements in hard-to-reach and space-limited areas.
Polytec’s fiber-optic vibrometers are widely used in the electronics industry for measurements on circuit boards, tiny bonding wires, mobile phones and hard disc drive components. Other applications are found in micro structures, medicine, zoology, and automotive manufacturing.

• Single-point (OFV-551) or two-arm differential (OFV-552) vibrometer

•  High efficiency delivery and collection optics produce usable signals from poorly reflecting surfaces up to 1 m away

• High spatial resolution

• Typical spot size only 15 µm with standard lens, 3 µm with optional accessories and down to 1 µm through microscopes

• Rugged internal fiber coupler stabilizes the system from misalignment of the interferometer

• Integrated power dimmer adjusts output intensity (optional)

• Extremely compact and robust housing

• Compatible with entire family of Polytec vibrometer controllers and microscope based systems