Sensors

CeSMA offers a wide variety of different mechanical sensors.
© Fraunhofer ISC
CeSMA offers a wide variety of different mechanical sensors.

At CeSMA, Smart Materials are used to implement a large number of sensors with which various mechanical properties such as deformations or strains, compression loads or forces and distances or the approximation of a body can be measured. Capacitive, resistive and piezoelectric methods are used as measuring principles. According to the different classes of Smart Materials available, sensors with different measured variables and measuring principles are created.

By adjustment of the material properties and the geometric structures, essential sensor specifications such as measuring range, measuring sensitivity and spatial resolution can be influenced over a wide range. While capacitive and resistive elastomer sensors can naturally detect very high strains of up to about 100 %, piezoelectric sensors cover the range of small strains from 0. 001 to 2 per mill. The measuring range of pressure sensors depends on the selected sensor principle and design and can be set between a few Pa and a few 100 MPa. The usual spatial resolution is in the range of centimeters, but can also be reduced to the millimeter range. The Center Smart Materials and Adaptive Systems already has extensive experience in designing the various sensor types.

 

Division of the sensor classes according to measured sensor properties:

    Capacitive Elastomer Sensors Resistive Elastomer Sensors Piezoelectric Sensors
Strain sensors Measuring range
Measuring accuracy
Dynamics
0 – ca. 100 %
ca. 1 %
0 – a few Hz
0 –  ca. 100 %
ca. 10 %
0 – a few Hz
0 – 0,2 %
ca. 0,001 %
0,01 – 106 Hz
Compression load sensors Measuring range
Measuring accuracy
Dynamics
0 – 1 MPa
ca. 1 %
0 – ca. 10 Hz
  0 – 20 GPa
ca. 0,001 %
0,01 – 100 MHz
Proximity sensors Measuring range
Measuring accuracy
Dynamics
0 – ca. 200 mm
ca. 1 %
0 – 1 Hz