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F.O.E

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Laser Extensometer

Scanning Laser Extensometers for measuring deformation at static, quasistatic and cyclic loading

Features

 

P-type
The laser extensometer - type parallel scanner is used for non-contact measurement of strain or compression of specimen at uniaxial load.




Before starting the experiment, two marks are put on the sample. 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 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.  

 
Technical Data P-50 P-100 P-130
Scan Range on Specimen 50 mm 100 mm 130 mm
Working Distance 100..300 mm 100..300 mm 100..300 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; 200 Hz 50; 200 Hz 50; 200 Hz
Duration of each Scan at Specimen 5.0 ms 5.0 ms 5.0 ms
Scan Speed On Specimen 10 m/s 20 m/s 27 m/s
Specimen Surface plane or
structured
(components)
plane or
structured
(components)
plane or
structured
(components)

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.

3 Point Bending Test Shear Tensile Test

Technical Data P-50D
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.



 

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

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

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

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.



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.
 
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)


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.  

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)