Capaforce Sensors : extreme condition testing

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We are now proud to announce that our sensors can resist more than 10 million 500g load cycles and extreme weather conditions: from -40°C to over 85°C, in high humidity environment.

Nanomade’s Capaforce sensors are the result of 10 years of scientific research carried out in prestigious institutes (INSA-LPCNO and LAAS-CNRS, in Toulouse). The sensors are fabricated using a proprietary deformation-sensitive ink based on nanoparticles. In order to ensure maximum efficiency in all use cases, we have performed fatigue tests, including load cycle testing and most recently climatic testing. We are now proud to announce that our sensors can resist more than 10 million 500g load cycles and extreme weather conditions: from -40°C to over 85°C, in high humidity environment

Creating the Capaforce sensor : the alliance of force and capacitive

Upon deformation, the smart ink on our Capaforce sensors has its deposited nanoparticles to move away from or closer to each other. This causes an exponential change in electrical resistance, allowing us to precisely determine the amplitude of deformation with a gauge factor is fifteen times higher than average,. The sensor’s thickness is of the order of a hundred micrometers, costing up to 10 times less than piezoelectric sensors. Associated with standard capacitive sensor technology, we were able to overcome the minor variations in electrical resistance of our deformation-sensitive (force) sensors. As a result, our CapaForce (capacitive and force combined) sensors ignore the unwanted interactions

Touch force sensor extreme condition testing

To ensure maximum efficiency of our sensors over time and in a variety of environmental conditions, we performed load cycle and climatic testing.

Load cycle tests were performed using an automatic load cycle machine which can simultaneously load up to four reference glass slides with weights varying from few grams to few kilograms. The glass slides are used as reference sensor-supporting materials: their backside is equipped with our sensors while their frontside is loaded with weights, mimicking repeated user actions.

After performing 10 million 500g load cycles on glass slides equipped with our CapaForce sensors, we find that our sensors are fully functional, with slight sensitivity degradations.

Before turning to real-time sensitivity measurements under extreme weather conditions, we performed so-called storage tests: we measured the sensitivity of our CapaForce sensors before and after exposing them to extreme climatic conditions. During the climatic tests, we explored relative humidities ranging from 25% to 95%, and temperatures ranging from -40°C to +85°C. Future tests will go as high as +120°C, to meet the recommended standards set in aeronautics and automotive fields (-40°C to +120°C)

In total, we launched 22 climatic and mechanical tests for over 650 hours of experimentation.

The tests consisted of analyzing two critical factors to our sensor: the sensitivity measurements showed fully functional sensors after 48 hours under hot dry, hot-humid, and cold dry environmental conditions. Regarding the real-time monitoring of the electrical resistance, we found that the sensitivity measurements showed fully functional sensors after 48 hours under hot dry, hot-humid, and cold dry environmental conditions.

Regarding the real-time monitoring of the electrical resistance, we found that extreme conditions resulted in only a slight change in the electrical resistance, These slight variations should easily be overcome thanks to the capacitive capabilities of our sensors, pointing to rather promising future real-time sensitivity measurements. Storage tests under extreme climatic conditions resulted in fully functional sensors. Real-time sensitivity measurements under extreme conditions will soon be performed

To enquire about our sensors or request further information, contact us as [email protected]

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