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A Comparison: Electrical or Optical Strain Gages

From HBM
 

 

Electrical strain gages (SG) are reliably used in many applications today. These strain gages were developed more than 50 years ago; today they are technically mature and available in many different versions.

For special applications - such as tests at high load cycles, use in highly explosive atmospheres or with electromagnetic interference - optical strain gages have recently become an interesting complement to classical strain gage technology.

The present paper provides a comparison of the characteristics of electrical and optical strain gages and is to provide orientation for finding the optimal solution to different measurement problems.

Since no guideline covering the characteristics of optical strain gages exists as yet, optical strain gages from HBM have been qualified in compliance with VDI/VDE 2635 [1] Richtlinie zur Bewertung von Dehnungsmessstreifen mit metallischem Messgitter (guideline for evaluating strain gages with metal measuring grids).

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