Laser Extensometer – Model 500LC

The Tinius Olsen model 500LC non-contacting extensometer is built to measure the extension of medium to high elongation materials, mainly elastomers. As there is no contact of this extensometer with the sample, the 500LC is perfect for also measuring the elongation of delicate samples where such contact could trigger a premature sample break.

The model 500LC uses a low power helium neon laser consisting of precision optical components and an exclusive dedicated 16 bit processor. The laser projects a visible red scanning beam that is aimed at two reflective targets attached to the specimen.

An extra benefit of using laser technology is its capability to scan the test specimen via the glass viewing window of an environmental test chamber. Elongation characteristics can then be assessed from –70 °C to 300 °C.

Preparation of the test specimen is fast and easy. A punch is supplied to cut thin strips of adhesive reflective tape. The gauge length is established by attaching these two reflective strips to the sample. Any gauge length can be used and this is exactly measured by the laser when the test commences. When force is applied to the sample, the laser scanning beam will measure the separation of the reflective gauge marks at a scan rate of 320 scans per second. In contrast to other non-contacting extensometers, if the scanning beam is disturbed for any reason, elongation measurements will automatically be altered when normal operation is recommenced.

MODEL 500L Extensometer Specifications

.
Range Of Measurement mm
in
up to 600
up to 23.6
Gauge Lengths mm
in
10 to full scan
0.39 to full scan
Accuracy 1% on 25 mm gauge length, BS5214 grade D
Resolution mm
in
0.012 with filtering
0.000472 with filtering
Optical Scan scans per second
degrees
320
90
Dimensions (H x W x D) mm
in
320 x 111 x 180
32 x 4.4 x 7.9
Weight kg
lb
7
15.5

Laser Extensometer – Model 500LC

Model 500LC extensometer mounted on an environmental chamber in a dual column testing machine.
The scanning laser is ideal for measuring strain of specimens inside an envornmental chamber. Here you can see the laser line scanning up the specimen which is placed in pneumatic grips in side inside an environmental chamber

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