#  Variation: Morphology 

 



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By changing channel geometry, other sensing modes besides strain are possible, including pressure, shear, and curvature ([Vogt et al. 2013](/publications/design-and-characterization-soft-multi-axis-force-sensor-using-embedded)).

Sort- Pressure: spiral shaped channel



   ![egain-varmorph1.png](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/sorotoolkit/files/egain-varmorph1.png?itok=_DSLW0W2) 

 



- Curvature: EGaIn channel sits over 2 other gaps



   ![egain-varmorph2.jpg](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/sorotoolkit/files/egain-varmorph2.jpg?itok=ruxHSydC) 

 



- Shear: incorporate force posts that will press on channels in different ways based on direction of shear/pressure



   ![egain-varmorph3.jpg](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/sorotoolkit/files/egain-varmorph3.jpg?itok=3wulXG7w) 

 







By stacking several different channel shapes, a single device capable of multiple types of sensing is possible ([Vogt et al. 2013](/publications/design-and-characterization-soft-multi-axis-force-sensor-using-embedded)).

Sort   ![egain-varmorph4.jpg](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/sorotoolkit/files/egain-varmorph4.jpg?itok=rh2gCD7N) 

 



   ![egain-varmorph5.jpg](/sites/g/files/omnuum4601/files/styles/hwp_1_1__360x360_scale/public/sorotoolkit/files/egain-varmorph5.jpg?itok=8SBNj3BE) 

 



Three U-shaped microchannels at 120o intervals to detect forces in three directions.



Three microchannels with increased spatial resolution