Polytec fiber vibrometers are selected when test surfaces are hard to reach, stand-off distances are relatively short or the smallest measurement spot is necessary.
Polytec's fibro vibrometers are very successful in the field of microelectronics and computer technology. The fiber probes can be adapted to microscopes for examining structures such as micro-actuators with a laser spot diameter of 2-3 µm or smaller.
Polytec OFV-501 Features
- Small probe size for easy positioning of the laser
- Fiber cable improves accessibility to hidden surfaces
- Probes mount to Polytec's small X, Y & tip/tilt stages & 90°-bend periscope optics
- Can be adapted to Polytec's test stands for precise positioning & simultaneous viewing and measuring of tiny parts
- Best spatial resolution for testing microscopic objects
Polytec OFV-501 Specs
| Interferometer |
| Laser Type |
Helium Neon |
| Laser Wavelength |
633 nm |
| Cavity Length |
205 mm |
| Laser Output Power / Classification |
2.3 mW / IIIa |
| System Output Power / Classification |
< 1 mW / II |
| OFV-501 Fiber Optic, Single Point Interferometer |
| Range of Standoff Distances |
5 cm to 30 m |
| Length of Fiber Cable |
2 m(3 m) |
| Minimum Bending Radius |
50 mm |
| Optical Head for Use with Fiber Optic Interferometer |
| OFV-100 dimensions (L x Diam.) |
4.3 x 2.25 cm (1.7 x 0.9") |
| OFV-3000 Controller Processor |
| Power Requirement |
100 / 110 / 220 / 240 VAC, 150 W, 50/60 Hz |
| Preamplifier and Tracking Filter Section |
| Track Range |
40 MHz ± 20 MHz |
| Range settings and associated maximum vibration frequencies |
"OFF": |
1.5 MHz max, depending on decoder range selected |
| "FAST": |
400 kHz max depending on target reflectivity |
| "SLOW": |
100 kHz max depending on target reflectivity |
Velocity Decoder Specifications:
| Decoder Type |
Measurement Range |
Full Scale Output
(Peak to Peak) |
Resolution |
Max. Signal Bandwidth
(3dB value) |
| OVD |
mm/s/V |
mm/s |
µm/s |
kHz |
| -01 |
1
5
25
125
1,000 |
20
100
500
2,500
20,000 |
0.5
0.6
0.8
1
2 |
35
150
150
150
150 |
| -02 |
5
25
125
1,000 |
100
500
2,500
20,000 |
0.8
2
5
10 |
250
1,500
1,500
1,500 |
| Output Swing |
± 10 Volts |
| Output Impedance |
100 Ω |
Low Pass Filter Specifications:
| Filter Type and Order |
Bessel 3rd order |
| Selectable Cutoff Frequencies |
5 / 20 / 100 kHz |
Displacement Decoder Section:
| Decoder Type |
Measurement Range |
Full Scale Output
(Peak to Peak) |
Resolution |
Max. Signal Bandwidth
(3dB value) |
|
|
|
OVD
-20
|
|
| |
|
mm/V |
mm |
µm |
kHz |
2
8
20 |
0.032
0.13
0.32 |
0.008
0.032
0.08 |
50 |
|
OVD
-10
| |
80
320
1,280
5,120 |
1.3
5.2
20.5
82 |
0.32
1.3
5
20 |
50 |
| Output Swing |
± 8 Volts |
| Output Impedance |
100 Ω |
| Triggering |
Manual triggering is possible using the RESET button on the front panel. Synchronized triggering is possible using related BNC connector. Slope: positive, min. signal level: 50 mVpp |
Outputs
| RF Out |
Buffered return signal from interferometer. BNC 40 MHz ± 32 MHz, 50 Ω |
| Vel Out |
Output voltage proportional to instantaneous velocity. BNC ± 10 V full scale, 100 Ω |
| Dspl Out |
Output voltage proportional to displacement of target. BNC ± 8 V full scale, 100 Ω |