| 摘要 |
<p>1. Device for monitoring the open or closed state of at least one electric contact (1) comprising a movable portion (1a) and a fixed portion (1b), by the passage of an electric current between said movable and fixed portions of said contact, characterized in that it comprises a light source (7, 9), a photovoltaïc generator (2) excitable by said light source a liquid crystal system (3) mounted in series with said at least one contact (1) at the terminals of asid photovoltaïc generator (2) and having two different optical states according to whether it is traversed by the current generated by said photovoltaïc generator or not, and means (4, 5, 9 to 13, 19, 20) for detecting and exploiting the states of said liquid crystal system (3).</p> |
