Polytec: OFV-5000 Modular Vibrometer Controller

The OFV-5000 Controller is the core of Polytec’s latest state-of-the-art laser vibrometer systems. Its modular design allows the frequency, velocity and displacement capabilities to be tailored to your applications. Both analogue and digital decoders are available, giving a frequency range from near DC to 24 MHz, with velocities to ± 10 m/s and displacements from the sub-nanometer to meter range. In combination with an interferometric sensor head of the OFV series, this is an ultra-precise workhorse for non-contact vibration measurement.

Modular Approach
A wide range of configurations offers optimum performance for the task with maximum flexibility and expandability to meet future needs.

Application-specific Configuration
By selecting from the different analog and digital decoders, performance can be precisely tailored to match the demands of your application. Several compatible standard optic and fiber optic sensor heads are available to meet specific needs for robustness, flexibility and ease-of-use.

Upgradeable to Scanning Vibrometer
The OFV-5000 is fully upgradeable to Polytec’s 1-D and 3-D Scanning Vibrometer systems for full-field vibration analysis.

Remote Focus Functions
Autofocus, remote focus and focus memory are all possible with the OFV-5000 Controller used with the OFV-505 Sensor Head.

Decoder Selection

The OFV-5000 Controller is designed to accept a range of signal processing modules, each optimized for different frequency, velocity or displacement performance. Various analog or digital decoder options seamlessly cover the entire velocity range up to ± 10 m/s, displacements from picometers to meters, and frequencies from DC to 24 MHz. For vibration velocities up to 20 m/s, Polytec offers the OFV Modular 20 m/s Vibrometer.

The following tables list the basic features of the velocity and displacement decoders available for the OFV-5000 Controller. For more information please see the separate data sheets for the decoders and the OFV-5000 Controller.

Velocity Decoders

Decoder	Description	No. of ranges	Best resolution	Max. velocity	Upper freq. limit
VD-02	Wide-bandwidth velocity decoder	4	0.15 µm/s	10 m/s	1.5 MHz
VD-04	Mid-frequency velocity decoder required for DD-400	3	0.2 µm/s	10 m/s	250 kHz
VD-05	10 MHz velocity decoder for ultrasonics	2	< 3 µm/s	2,5 m/s	10 MHz
VD-06	Digital high-precision velocity decoder required for DD-500	4	0.02 µm/s	0.5 m/s	350 kHz
VD-09	Broadband digital velocity decoder required for DD-900	14	0.02 µm/s	10 m/s	2.5 MHz

Displacement Decoders

Decoder	Description	No. of ranges	Best resolution	Full scale output	Freqency range
DD-100	Basic displacement decoder	8	80 nm	±82 mm	0 Hz - 250 kHz
DD-300	20 MHz displacement decoder for ultrasonics.	1	0.1 pm	±75 nm	30 kHz - 24 MHz
DD-400	Integrating displacement decoder	3	frequency dependent	±1 mm	20 Hz - 250 kHz
DD-500	Digital high-end displacement decoder	16	15 pm	±50 mm	0 Hz - 350 kHz
DD-900	Broadband digital displacement decoder	16	15 pm	±50 mm	0 Hz - 2.5 MHz
DD-600	I&Q converter for data processing with VibSoft VDD

Recommended Decoder Combinations

The OFV-5000 Controller has four internal slots to accept up to four different signal decoders, depending on the desired measurement ranges. Two are specifically designated for velocity decoders and one is for a displacement decoder. An auxiliary slot is provided that can take an optional velocity or displacement decoder.

The following table lists recommended decoder combinations for representative applications. Other combinations are possible. If you have specific requirements, please contact Polytec’s application and sales engineers who will help you select the appropriate decoders and VibSoft software.

Velocity decoder	Displacement decoder	Application
VD-02	DD-100	Measurement of velocity and displacement up to 1.5 MHz and 10 m/s velocity. General applications, e.g. acoustics, mechanical and automotive engineering.
VD-06	DD-500	Digital, high-precision measurement of velocity and displacement at frequencies up to 350 kHz with velocity range limited to 0.5 ms^{-1<//font><//font>}. Demanding applications e.g. acoustics, microsystems, precision mechanics.
VD-02 VD-06	DD-500	Same as above, but vibration frequency range extended up to 1.5 MHz and velocity range extended up to 10 m/s.
VD-02 VD-05		Measurement of velocity at high frequencies up to 10 MHz. High-frequency applications, e.g. ultrasonics, microsystems
VD-02	DD-300	Acquisition of vibrations at frequencies up to 24 MHz. High-frequency applications, e.g. ultrasonics, micro systems
VD-04	DD-400	Special solution for measurement of small displacements at very high velocities. Applications such as monofrequent ultrasonic tools and processing, e.g. wirebonding, ultrasonic welding
VD-09		Acquisition of vibrations at frequencies from DC up to 2.5 MHz at high resolution and velocity. Application: ultrasonics and microstructures
VD-09	DD-900	Additional direct displacement output with picometer resolution. Suitable for measurement of signals with DC components like switches or transient behaviour.

Miscellaneous
VIB-A-CAS01	Transportation Case Heavy-duty transportation and storage case carrying the OFV-5000 Controller and an OFV-50x Vibrometer Sensor Head.
VIB-A-CAS02	Transportation Case Heavy-duty transportation and storage case for the OFV-5000 Controller.