VD-05 10 MHz Velocity Decoder
MODULAR
VIBROMETER SYSTEM
OFV-5000
Vibrometer Controller
- Velocity Decoders
- Displacement Decoders
OFV-505/503
Standard Sensor Heads
OFV-551/552
Fiber Interferometers
M E A S U R I N G V E L O C I T Y AT U LT R A S O N I C F R E Q U E N C I E S
Signal processing is one of the most sensitive parts of any Laser Doppler Vibrometer
system. The VD-05 Velocity Decoder has been specifically developed to meet the
exacting requirements for acquiring ultrasonic vibrations and impulses.
Velocity Decoding in Laser
Vibrometer Systems
The VD-05 Auxiliary 10 MHz
Velocity Decoder
Polytec Laser Doppler Vibrometers operate on
the Doppler principle, measuring the frequency
or phase shift of back-scattered laser light from
a vibrating structure, to determine its vibrational
velocity and displacement.
The VD-05 velocity decoder is designed to
acquire high-frequency vibrations up to 10 MHz,
as well as fast transient motions such as pulseshaped signals. These applications are common
for example in the domain of ultrasonic technology and micro mechanical systems. Despite
the wide bandwidth, the VD-05 attains excellent
resolution values with spectral signal evaluation.
The maximum velocity of 3 m/s allows vibration
amplitudes of approx. 50 nm at the upper limit
of the operating frequency range.
A vibrometer system is comprised of two basic
elements: a controller and a sensor head. The
controller provides control voltages and power
to the sensor head and processes the raw sensor
head output signal to extract the measurement
data. This processing is performed by specially
developed decoders within the controller to
obtain velocity and displacement information
about the vibration of the structure.
Polytec offers a range of analog and digital velocity decoders with different characteristics. The
VD-05 Velocity Decoder has been developed as
an auxiliary decoder for specific measurement
applications, working independently of the other
decoders installed in the controller.
Advancing Measurements by Light
Key Features of the VD-05
Independent, auxiliary decoder
Large bandwidth from 0.5 Hz to 10 MHz
for acquisition of ultrasonic velocity signals
Two measurement ranges of 0.5 m/s and
2.5 m/s full scale (peak)
Maximum acceleration 1,600,000 g
www.polytec.com
VD-05 Technical Data
Measurement
Range
1)
Maximum
Full Scale
(Peak)1)
Resolution 2)
Signal
Frequency
Range
Max.
Acceleration
g
Max.
Linearity
Error3)
mm/s/V
m/s
µm s-1/√Hz
Hz
100
0.5
<3
0.5 … 10 M
320,000
% of reading
2
500
2.5
<3
0.5 … 10 M
1,600,000
2
The full scale values correspond to the nominal output voltage of 5 Vpeak.
The range up to 6 Vpeak can be used at reduced linearity specifications.
2)
The noise-limited resolution is defined as the signal amplitude (rms) that produces 0 dB signal-to-noise
ratio with 1 Hz spectral resolution, measured on 3M Scotchlite® Tape (reflective film). The attainable
resolution is frequency-dependent. The typical value refers to the center of the operating frequency range.
3)
The linearity error is defined as the amplitude-dependent, relative deviation of the scaling factor,
referred to the scaling factor under calibration conditions (sinusoidal vibration, f = 100 kHz,
amplitude 70% of full scale range, load resistance ≥ 1 MΩ).
Polytec-PI, S.A.
32 rue Délizy
93694 Pantin
France
Tel. + 33 (0) 1 48 10 39 34
Fax + 33 (0) 1 48 10 09 66
info@polytec-pi.fr
Lambda
Photometrics Ltd.
Lambda House, Batford Mill
Harpenden, Herts AL5 5BZ
Great Britain
Tel. + 44 (0) 1582 764334
Fax + 44 (0) 1582 712084
info@lambdaphoto.co.uk
VD-05 Range Diagram
Technical specifications are subject to change without notice. OM_DS_VD-05_2010_07_PDF_E
Polytec GmbH
Polytec-Platz 1-7
76337 Waldbronn
Germany
Tel. + 49 (0) 7243 604-0
Fax + 49 (0) 7243 69944
info@polytec.de
Polytec KK
Hakusan High Tech Park
1-18-2 Hakusan, Midori-ku
Yokohama-shi, 226-0006
Kanagawa-ken
Japan
Tel. +81 (45) 938-4960
Fax +81 (45) 938-4961
info@polytec.co.jp
Polytec, Inc.
North American Headquarters
1342 Bell Avenue, Suite 3-A
Tustin, CA 92780
USA
Tel. +1 714 850 1835
Fax +1 714 850 1831
info@polytec.com
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Data Acquisition
For PC-based data acquisition and processing we recommend our VibSoft Packages. VibSoft M2-40
is a comprehensive software best suited for the VD-05 Velocity Decoder including data acquisition board
for dual channel data acquisition at 40 MHz bandwidth.
For more information on selection and combination of signal decoders please see OFV-5000 Vibrometer
Controller and Decoder Guidelines data sheets, or contact your local sales/application engineer. The data
sheets can be downloaded from www.polytec.com or can be requested at your local Polytec Office.
Advancing Measurements by Light
www.polytec.com
Polytec, Inc.
East Coast Office
16 Albert Street
Auburn, MA 01501
USA
Tel. +1 508 832 0501
Fax +1 508 832 466