Miniature strain gage targets AVs, IIoT, and wearables

Miniature strain gage targets AVs, IIoT, and wearables

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The Micro-Measurements brand of Vishay Precision Group (Malverne, PA) has introduced a miniature stacked rectangular rosette sensor designed to meet the increasing need for precise, consistent, and reliable stress analysis of PCBs, even in severe environments.
By Rich Pell

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The G1350 C2K-Series miniature strain gage is designed to enable quick and accurate detection of PCB surface strains at critical locations in consumer electronics. The increasing miniaturizing of consumer electronics, says the company, will result in higher component density, increased thermal stresses, new requirements for surviving repeated loadings, and a larger need for impact stress survival.

The G1350 is offered as being particularly advantageous in applications that can benefit from its small size and higher resistance of 120 and 350 ohms. Example ideal applications cited by the company include structural health monitoring, industrial Internet of Things (IIoT), autonomous vehicles (AVs), instrumentation & control, machinery & equipment, motion control, Industry 4.0, robotics, smart cities, smart manufacturing, smart infrastructure, wearable electronics, and wireless applications.

The uniaxial linear stacked rosette C2K-06-G1350-350 features an active grid length of only 0.040” and an overall matrix of 0.20-in. diameter to allow spot-on installation on surface-mount components. Three meters of pre-attached three-conductor cable eases installation processes by eliminating the need for lead wire soldering after bonding.

The device features a Modified Karma, or K-alloy (C2K), and an epoxy overcoat for grid encapsulation. The second generation of the G1350 is based on K-alloy, which can be exposed to temperatures as high as +150°F (+66°C). An inert atmosphere will strengthen stability and extend the useful gage life at high temperatures, the company says.

K-alloy also offers a much flatter thermal output curve than A-alloy, allowing more precise correction for thermal output inaccuracies at temperature extremes. K-alloy can be self-temperature-compensated for use on materials with different thermal expansion coefficients, and is the normal selection when a temperature compensated gage is required that has environmental capabilities and performance characteristics not attainable in A-alloy gages.

For more on high-precision measurement of stress and strain, visit the company’s StrainBlog.

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