Sensors that withstand temperature fluctuations

Louise Smyth

Eddy current sensors are perfectly suitable for measurements in harsh industrial environments even when pressure, dirt or temperature fluctuations occur. eddyNCDT sensors from Micro-Epsilon offer extremely precise measurements and are used where micron accuracies are required. Their physical measuring principle allows them to measure through non-conductive materials. For this reason, dust, dirt and oil do not affect measurement performance. This fact combined with the sensor’s robust, temperature-compensated design enables high precision measurements in harsh, industrial environments. To ensure high measurement accuracy even with fluctuating temperatures, the sensors are temperature-compensated.

These sensors are often used in applications where harsh ambient conditions are present and where maximum precision is required. Immunity to dirt, pressure and extreme temperature are distinctive features. Ambient temperature fluctuations are one of the critical factors that influence the accuracy of measurement results. In particular, the measurement results of displacement sensors that work at resolutions in the micrometre range are affected by temperature fluctuations. Numerous displacement sensors from Micro-Epsilon thus actively compensate for temperature, therefore providing high signal stability even in fluctuating temperatures.

In terms of temperature fluctuations, there are two factors that influence the measurement signal. These are mechanical changes, where the geometric dimensions of the sensor and the target change in the form of extension or contraction. Alternatively, there are electrical influences that have a greater impact than mechanical changes. In this case, the electromagnetic characteristics also change. Micro-Epsilon uses active temperature compensation to improve stability. In complex processes, the effects of temperature fluctuations are accounted for. Being used in ambient temperatures from -40°C to more than 200°C, the eddyNCDT sensors are robust against temperature fluctuations. l

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