Laser strain extensometer for material testing

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen

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73 1B, G01N 308

Patent

active

048691100

ABSTRACT:
A non-contact, laser strain extensometer for use in materials testing utilizes a revolving laser beam to measure the separation of benchmarks placed on the specimen to be tested. The reflection of the laser beam from the benchmarks is focused on a photosensor to generate electronic pulses. The time duration between these pulses can be precisely measured using electronic counters. This time duration correlates with the distance separating the benchmarks. The revolving beam can be generated either by rotating polygonal mirror or an oscillating mirror.

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Instron Corp. Technical Literature, Instron 4500 Series Universal Testing Instruments.

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