#  Contraction Sensing 

 



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The actuator built with the 30 cm Smart Braid was able to contract 5.7 cm . A linear calibration is sufficient to use the inductance measurements to predict the actuator contraction. The contraction was able to measured within about a milimeter. The sensor response was tested with a sinusoidal pressure signal up to 4 Hz and could not find any evidence of performance degradation.

   ![contraction_calibration.png](/sites/g/files/omnuum4601/files/styles/hwp_1_1__720x720_scale/public/srtdesigncomp/files/contraction_calibration.png?itok=PWwHXaXz) 

 

 ![high_frequency_test.png](/sites/g/files/omnuum4601/files/srtdesigncomp/files/high_frequency_test.png)