TU Berlin

Robotics and Biology LaboratoryActive Acoustic Sensing

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Active Acoustic Sensing


Master Thesis
Gabriel Zöller


Sensors are an important part of any robot control system. While soft pneumatic actuators can't use most sensors from rigid robotics, they exhibit properties that make new sensing modalities possible. The air inside the air chamber of a pneumatic actuator conducts sound and this sound carries information about where it originated and which path it traveled.

Description of Work

This thesis develops and characterizes a contact sensor by playing back a known sound and analyzing how it changes when a PneuFlex actuator touches an object in different ways.

A small microphone and speaker are embedded into the airchamber, a sound with a wide spectrum is played back, recorded and run through a classifier. The spatial resolution of this sensor is very high and can distinguish between areas of contact 3mm in size on a 85mm long actuator.

Relevant Publications

Gabriel Zöller and Vincent Wall and Oliver Brock. Acoustic Sensing for Soft Pneumatic Actuators. IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), pp. 6986-6991, 2018.


Gabriel Zöller

Vincent Wall

Oliver Brock



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