| 摘要 |
<p>A sensor is used to convert physical quantities (s) into an electric signal (S). It has a light-conducting measuring member (40) which is provided with spatially divided luminous elements (43), from which light beams (46, 47) emanate in a diffuse distribution. Depending on the physical quantity (s), the light beams (46, 47) emerge at boundary surfaces of the measuring member (40) or are totally reflected. The totally reflected light beams (46, 47) are coupled out at an end face (50) of the measuring member (40) and impinge on photosensitive elements (56, 57) whose output signal is converted into the electric signal (S). In order to eliminate environmental influences, in particular the ambient temperature, as a quantity which falsifies the measurement, the measuring member (40) has a light-conducting core (41) with a first refractive index and a light-conducting cladding (42) which surrounds the core (41) and has a second refractive index. The first refractive index is higher than the second refractive index, and the latter in turn is higher than a third refractive index of an outer space (10) surrounding the cladding (42). The light beams (46) guided in the core (41) by total reflection are coupled out of the end face (50) separately from light beams (47) guided in the cladding (42) by total reflection, and are fed to separate photosensitive elements (56, 57). <IMAGE></p> |
