| 摘要 |
An alcohol concentration detecting apparatus comprising a transparent body (1,1a,1b,1c,1d) transparent to light and having a refraction surface (9) disposed, when in use, in contact with liquid fuel (12) to define an interface between the transparent body and the fuel, the transparent body (1) defining a light path (7,16) for allowing the light to pass through the refraction surface (9) for refracting the light (7). A light-emitting element (4) is disposed on one end of the light path and emitting a light beam (7,16) along the light path, and a position detector element (8) disposed at the other end of the light path for receiving a refracted light beam refracted at the refraction surface (9) and generating an output indicative of the amount of alcohol contained in the fuel. The sensor also comprises an optical lens (6;13,13a,13b,14,14a,14b) for directing and focusing the light beam (7,16) from the light-emitting element (4) onto the optical position detector element ( 8). The optical lens may include a collimator lens (13) for converting the light beam into a substantially parallel light beam (16), and a condenser lens (14) for focusing the parallel light beam on the position detector element (8).
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