By Stefan Hesse
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Extra info for Sensors in Production Engineering
Example text
1 Magnetoresistor sensor Magneto-resistive sensors belong to the family of galvanomagnetic measuring sensors. Two different effects are exploited here, the • transverse magneto-resistive effect (Gauss effect; sensors of this type are magnetoresistor sensors) and the • longitudinal magneto-resistive effect (sensors of this type are metal thin layer sensors. ) A magnetoresistor is a wave-form semi-conductor structure whose resistance increases relative to the force of a magnetic field. The electric current flows straight through the path of resistance provided that there is no magnetic field acting on the resistor.
In this solution, the sensor is firmly mounted and works on the basis of a helium-neon laser. It directs the laser beam to the successive points where a component should be. The diffuse reflected light beam is then evaluated and compared with the saved reference light values. This comparison allows conclusions to be drawn as to the presence of components. The robot must hold the assembly in a precisely defined position. The distance between the sensor and the object to be measured should not exceed 3 metres.
The fluid level is recorded according to the principle of reflection and the light is forwarded to the reflex light sensor by fibre optic cables. The fluid level changes the refraction of the light at the measuring point and this is converted into a switching signal. The second solution works in a similar way: An appropriate number of sensors with fibre optic cables are arranged to indicate several levels. The light in the glass endpiece (prism or conical microsection) is reflected into the air (see principle in Fig.