PRELIMINARY TESTS FOR THE ASSESSMENT OF SOME COMMERCIAL, LOW COST, SENSORS FOR MEASURING THE TEAT-LINER CONTACT PRESSURE
Journal Title: ISB-INMA TEH AGRICULTURAL AND MECHANICAL ENGINEERING - Year 2018, Vol 0, Issue 8
Abstract
The purpose of the paper was to evaluate, under laboratory conditions, different types of flexible force sensors: three force sensitive resistor (FSR) sensors and one capacitive sensor. The FSR sensors were: FSR 400, FSR 402 (Interlink) and A201 FlexiForce (Tekscan); the capacitive sensor was a SingleTact miniature force sensor. A FC-22 compression load cell (Phidgets) was used as a reference. The linearity, hysteresis and drift were evaluated for each sensor. The linearity and hysteresis characteristics of the sensors were evaluated in static tests, gradually loading and then unloading the sensors (nine steps, from 1.84 N to 10.67 N and then back to 1.84 N); the output voltage was measured for each load step. Drift tests evaluated the increase of the sensor output signal with time (2500 s), under constant load (9.81 N). The FC-22 and A201 sensors have displayed perfectly linear characteristic, with r2=0.999; for the FSR 400 and FSR 402 the output voltage was given by a second order polynomial (r2=0.998 and r2=0.999, respectively). For the SingleTact sensor the response was also linear (r2=0.968). No hysteresis was recorded for the FC-22 sensor and only minor hysteresis was recorded for the A 201 and SingleTact sensor (average values of -0.96% and -2.4%, respectively). The FSR 400 sensor recorded relatively low values of the hysteresis (-9. + 8.0%), while for the FSR 402 sensor the hysteresis was comprised between -25.6 and 1.65%. There was no drift recorded for the FC 22; for A 201 sensor the drift was 2.1%, while a significant drift was recorded for the other sensors.
Authors and Affiliations
Radu Rosca, Petru Carlescu, Ioan Tenu, Vlad Arsenoaia
Keywords
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