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HBM has launched the K-OTC sensor, designed to resolve the challenges of compensating optical strain-gauge measurements for temperature fluctuations.

It is essential to compensate for temperature sensitivity of optical strain gauges, such as HBM’s K-OL and K-OR models, especially when testing strains that are relatively small and temperature differences are high.

Optical strain gauges are sensitive to temperature variations because of the sensitivity of the fibre Bragg grating that forms the strain gauge and the thermal dilation of the object being measured.

This can be up to 30um/m/K, depending on the material involved but, in stress analysis, engineers are normally only interested in mechanical strain.

The K-OTC is based on an optical strain gauge applied to an aluminium sensor body.

It is attached to the object under test and only measures the thermal dilation of the aluminium and the temperature-dependent signal change of the fibre Bragg grating.

This means that no mechanical strain is transferred although temperature compensation does take place.

The K-OTC signal is compared with the optical strain gauge signal using HBM’s CatmanAP software to provide automatic compensation.

Optical strain gauges are typically used for experimental stress analysis in difficult conditions such as high-voltage, powerful magnetic interference or in potentially explosive atmospheres because they use light, rather than electrical signals.

HBM provides all the components users need from one source.

As well as optical strain gauges and the K-OTC temperature compensation sensor, this includes interrogators and the data acquisition software CatmanAP, which has a special Easyoptics module for optional SGs.

HBM UK Ltd

Our extensive range covers everything from strain gages via measuring transducers to analog and digital amplifiers. Since our amplifiers can be connected to a PC, measured values can be further processed and then meaningfully displayed with the aid of operator-friendly analysis software specifically designed for measurement technology.

Our extensive range covers everything from strain gages via measuring transducers to analog and digital amplifiers. Since our amplifiers can be connected to a PC, measured values can be further processed and then meaningfully displayed with the aid of operator-friendly analysis software specifically designed for measurement technology. Innovative new products in the field of transducer development, signal conditioning and software are witness to our competence and up-to-date product know-how.

In addition to these standard products, HBM also provides customized solutions for sensor technology and electronics as well as complete systems. Our products and solutions are used in all sectors of industry. Our subsidiary companies and over 60 branch offices and agencies worldwide are responsible for providing expert support for measurement technology solutions on site.

The “complete measuring chain from one supplier” approach has many advantages:
The complete measuring chain comes from HBM. This means that all components in a system are adapted to work with one another.
Just one point of contact for everything you need. This saves you both time and money.
Our long experience means we understand your needs. Practical solutions come naturally to us.

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