Abstract
Magnetostrictive linear position sensors (MLPS) are high-precision sensors used in the industrial field for measuring the propagation time of ultrasonic signals in a waveguide. To date, MLPS have attracted widespread attention for their accuracy, reliability, and cost-efficiency in performing non-contact, multiple measurements. However, the sensor, with its traditional structure, is susceptible to electromagnetic interference, which affects accuracy. In the present study, we propose a novel structure of MLPS that relies on two differential waveguides to improve the signal-to-noise ratio, common-mode rejection ratio, and accuracy of MLPS. The proposed sensor model can depict sensor performance and the relationship of sensor parameters. Experimental results with the new sensor indicate that the new structure can improve accuracy to ±0.1 mm higher than ±0.2 mm with a traditional structure. In addition, the proposed sensor shows a considerable improvement in temperature characteristics.
Highlights
Linear position sensors based on magnetostrictive effect are widely used in the industry today for position measurement and monitoring
Even minor electromagnetic interference (EMI) or noise can lead to great measurement errors and increasing the signal-to-noise ratio is the key design issue for magnetostrictive linear position sensor (MLPS)
To radically improve the SNR and sensory performance, we propose a different waveguide structure for the MLPS, which will be discussed
Summary
Linear position sensors based on magnetostrictive effect are widely used in the industry today for position measurement and monitoring. In accordance with the Wiedemann effect and the Villari effect, the magnetostrictive linear position sensor (MLPS) uses a ferromagnetic material waveguide to perform. In comparison with other types of sensors, the MLPS is preferred for its accuracy, reliability, and cost-efficiency in performing non-contact, high precision, and long-range measurements [3,4,5]. A MLPS allows measurement without contact between the cursor and the sensing rod; the device can have a long service life and a high level of ingress protection under harsh industrial conditions [6]. We illustrate a novel differential waveguide structure that can improve the signal-to-noise ratio and accuracy of the sensor. The proposed structure has been patented to prreserve the authors’ rights on the use of the device
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