| 摘要 |
<p>The invention relates to a pressure sensor comprising an optical waveguide (8) having an optical fibre (2) with a refractive index n1, located in a fibre guide (6) with a refractive index n3, forming an intermediate region (10). A medium with a refractive index n2 is located in the intermediate region (10). The refractive indices correspond to the relation n3 > n1 > n2. When subjected to a pressure, the fibre guide (6) is pressed against the optical fibre (2), in such a way that the condition for the total reflection required for the normal optical waveguidance in the optical waveguide (8) is no longer fulfilled, and attenuation takes place. Said attenuation is evaluated in a corresponding control unit (30). The pressure sensor is especially provided for an anti-pinch device in the motor vehicle industry.</p> |
