The sensor is primary used as pressure sensor or as a touch sensor. It consists of one optical waveguide. Its optical attenuation
depends strongly on the local pressure and takes advantage of the evanescent field properties. The optical
waveguide core is similar to a normal plastic optical fiber. There is a light-absorptive layer in the optical cladding. The
transmitter is placed on one side of the sensor with a signal source, such as an LED and there is a receiver on the other
side with one photosensitive element, such as a PIN diode. In the normal state (no pressure), there is a total reflection at
the boundary between the core and the cladding. The optical rays do not reach the absorptive layer. Under pressure, since
the optical ray is skin-deep in the optical coating, the light will absorb in the absorptive layer. This results in a strong rise
of optical attenuation.
Conference Committee Involvement (1)
Photonics in the Transportation Industry: Auto to Aerospace II
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