| 摘要 |
<p>The invention relates to a wetting detector (100) for detecting which one of a first and a second medium is present at a contact surface (212) of a carrier (200). In a preferred embodiment, the wetting detector (100) comprises a light source (110) for emitting a primary light beam (L0) onto a test region (213) at the contact surface (212), from where a secondary light beam (LR) is reflected and then detected by a light detector (120). The angle (?) of incidence of the primary light beam (L0) is chosen such that it is between the critical angles (?c,a, ?c,f) of total internal reflection of the first and the second medium. The occurrence or the absence of total internal reflection, which can be detected in the amount of light in the secondary light beam (LR), can thus be used to infer if the first or the second medium is present at the contact surface (212). The wetting detector can particularly be used in a microelectronic sensor device to detect if the contact surface (212) is wetted with a liquid sample or if e.g. gas bubbles (3) are present.</p> |
