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The laser extensometer P-50D is used for non-contact measurement of strain, compression, or motion of specimen along two scanning lines. |
A laser beam is directed onto a rotating optical flat. During entering and leaving the laser beam is refracted at two opposite planes of the optical flat which results in an identical refractive angle. By the rotation of the optical flat, the laser beam is deflected in parallel to itself and scans along the specimen.
The P-50D includes an optical beam splitter which generates two scan lines. One scan line is fixed, the other is adjustable in horizontal position. The distance between the scan lines can be adjusted by the user between 0 and 20 mm - other ranges are available on request.
The extensometer is optimized for experiments like shear strain, crack opening and bending tests.
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| 3 Point Bending Test |
Shear Tensile Test |
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| Technical Data |
P-50D |
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| Scan Range on Specimen |
50 mm |
| Distance between Scan Lines |
0 - 20 mm |
| Working Distance |
100..300 mm |
| Resolution (micron) |
0.1 um |
| Accuracy (DIN EN 10002-4) |
Class 0.2; 0.5; 1 |
| Scanning Rate |
50; 200 Hz |
| Duration of each Scan at Specimen |
5.0 ms |
| Scanning Speed at Specimen |
10 m/s |
| Specimen Surface |
plane or structured (components) | | |
 W-type
The SWS-300 is a deformation meter for all materials. Its high accuracy allows non-contact strain control from elasticity range till breaking elongation.
The surface of the specimen is scanned by a laser beam. A set of stripes applied to the surface reflects the laser light. The receiver evaluates the reflected light and changes the signals into digital impulses. The positions of stripes and the measured length are determined from the time process of the signals. A novel deflection system allows the SWS-300 to measure changes in distance between specimen and scanner.
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Advantages |
- highest precision up to a big measuring area of 300mm
- accuracy class 1 (referring to DIN EN ISO 9513)
- non-contact measurement with measuring marks
- no influence of specimen by extensometer
- easy integration in testing machine software
- measurement of pressure tests and bending tests
- measurement from smallest to big strains
- determination of E-module without additional receiver or rebuilding
- measurement of changes in distance between specimen and SWS-300
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Optional extensions |
- the whole experimental run is traceable on screen
- strain-regulated experiments are possible
- local dissolving at measurement of breaking elongation at welds and assembling components
- force recording with evaluation software for calculation of characteristic values
- applicable to climatic chambers
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| Technical Data |
SWS-300 |
| measuring range |
300 mm |
| accuracy class (DIN EN ISO 9513) |
1 |
| resolution |
1 μm |
| lowest measuring length |
2 mm |
| working distance (scanner<>specimen) |
250 mm |
| scanning rate |
100 Hz |
| number of stripes |
2 / optional locally resolved |
| Laser safety class |
2 M (no additional protective arrangements necessary) |
| dimensions/weight |
310 mm x 240 mm x 250 mm / 8 kg | |
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Cross-type
The laser extensometer - type cross-scanner is used for simultaneous contact free measurement of longitudinal and lateral strain of specimens at uniaxial load. This scanner type is optimized for determining Possion's ratio.
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Before starting the experiment, two marks for longitudinal strain and two marks for lateral strain are put on the sample. One laser beam for each measuring direction is directed onto rotating optical flats. During entering and leaving the laser beam is refracted at two opposite planes of the optical flat which results in an identical refractive angle. By the rotation of the optical flat, the laser beam is deflected in parallel to itself and is directed onto the specimen. The laser extensometer scans the measuring range with a visible laser beam. After automatically determining the reference length at the beginning, the positions of the marks are continuously observed throughout the experiment. |
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| Technical Data |
K-50 |
K-100 |
K-130 |
| Working Distance |
100-300 mm |
100-300 mm |
100-300 mm |
| Longitudinal Strain |
| Scan Range on Specimen |
50 mm |
100 mm |
130 mm |
| Resolution (micron) |
0.1 um |
0.25 um |
0.3 um |
| Accuracy (DIN EN 10002-4) |
Class 0.2; 0.5; 1 |
Class 0.5; 1 |
Class 0.5; 1 |
| Scanning Rate |
50; 100 Hz |
50; 100 Hz |
50; 100 Hz |
| Duration of each Scan at Specimen |
5.0 ms |
5.0 ms |
5.0 ms |
| Scanning Speed at Specimen |
10 m/s |
20 m/s |
27 m/s |
| Lateral Strain |
| Scan Range on Specimen |
50 mm |
50 mm |
50 mm |
| Resolution (micron) |
0.1 um |
0.1 um |
0.1 um |
| Accuracy (DIN EN 10002-4) |
Class 0.5 |
Class 0.5 |
Class 0.5 |
| Scanning Rate |
50; 100 Hz |
50; 100 Hz |
50; 100 Hz |
| Duration of each Scan at Specimen |
5.0 ms |
5.0 ms |
5.0 ms |
| Scanning Speed at Specimen |
10 m/s |
10 m/s |
10 m/s |
| Specimen Surface |
plane or
structured
(Components) |
plane or
structured
(Components) |
plane or
structured
(Components) | | |
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Biax-type
The laser extensometer - type biax-scanner is used for non-contact measurement of strain or compression of specimen at biaxial load.
Two laser extensometers of the type parallel-scanner are combined to measure strain in X- and Y-direction. The scanning sequence of the two systems is synchronized to each other. A single receiver with special optical components is used for both scanners.
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| Technical Data |
B-50 |
B-100 |
B-130 |
| Scanning Range on Specimen |
50 mm |
100 mm |
130 mm |
| Working Distance |
250..400 mm |
250..400 mm |
250..400 mm |
| Resolution (micron) |
0.1 um |
0.25 um |
0.3 um |
| Accuracy (DIN EN 10002-4) |
Class 0.2; 0.5; 1 |
Class 0.5; 1 |
Class 0.5; 1 |
| Scanning Rate |
50; 100 Hz |
50; 100 Hz |
50; 100 Hz |
| Duration of each Scan at Specimen |
5.0 ms |
5.0 ms |
5.0 ms |
| Scanning Speed at Specimen |
10 m/s |
20 m/s |
27 m/s |
| Specimen Surface |
plane or
structured
(components) |
plane or
structured
(components) |
plane or
structured
(components) | | |
