One solution for all your needs
Any material, metal, plastic, polymers, belts, ropes, etc, can be used providing a defining set of marks can be applied. Including (with two cameras systems) strand, wire, reinforcing bar, rubber, etc
The camera frame rate is up to 500 frames per second depending on camera type, lighting, and the field of view.  This allows for dynamic testing up to 20Hz depending on the number of data points required. The image processing can support this rate with either dots or lines defining the gauge marks.
Measurement output from the system can be either analog +/-10VDC, RS232 serial, or Ethernet to allow use on various testing.

Specimen Marking
Specimen marking can be a minimum of 2 dots or 2 lines, or a 2-D dot matrix to analyse a coarse strain field, or up to 60 lines, texture marks or a rectangular grid, to accommodate specimen fracture anywhere within the parallel length.  A random dot pattern can be used to analyse strain distributions in odd shaped specimens.
The system can also detect the textures or paints on the surface of the specimen as gauge marks, such as the ribs on the reinforcing bar. Using the texture eliminates the need to manually mark the sample with no influence on specimen properties and saves operator time.
Transverse strain measurement can be taken from the average of a 2-D dot target; a grid of lines on a specimen; or the specimen edges if a backlight is used.
Both multiple vertical lines and transverse lines can be monitored and measured at the same time

Advantage and Features

• High accuracy and resolution
• Precision Telecentric system has a negligible out-of-plane sensitivity so full strain measurement accuracy is maintained, it is ideal for low strain materials such as composites, metal, alloy, etc
• Large field of view (with multiple cameras) enable the system to track the gauge marks until failure.
• No specimen contact and specimen marking may not be required. The system can detect and track the reinforcing bar rib pattern on the surface through the tests，it can also monitor the texture or paint on specimen surface as gauge length marking.

• Multiple pairs of gauge length can be tracked and measured at the same time
• Measurement of transverse strain
• Measurement of r & n values on metals according to ISO 10113 and ISO 10275
• Measurement in two dimensions up to 100 measuring points in any desired configuration or arranged in matrix form on a plane specimen surface can be dimensioned (option 2D dot-matrix)
• Can be used in environmental chamber tests or for elevated temperature tests.

Typical Configuration

Single Camera system with field of view up to 200mm for standard metal, plastic, composite testing. Optional transverse measurement feature enables the system to measure n-value and r-value.

Two Cameras are in the same housings to form a joint field of view up to 650mm, with each camera covering approx. 340mm field of view.  This configuration is widely used for large gauge length testing (for example 500mm or 600mm gauge length) such as rebar and strand wire tests, as well as rubber and elastomers with long elongation

Single Camera system with telecentric lens to achieve maximum field of view up to 80mm for low strain material such as metal, composite, carbon fiber testing. Equipped with optional back light to measure transverse direction enables the system to measure Poisson’s ratio, n-value and r-value