| 摘要 |
Apparatus for determining a vertical position of at least one interface (IF) between a first component (1) and at least one second component (10), the components (1, 10) being comprised as different layers in a sample container (3), the apparatus comprising: a first sensing unit (4) comprising: a first laser diode (4a) emitting light having a first wavelength, which is substantially transmitted by the sample container (3) and the first component (1), a first collimating optics (4b) adapted to collimate the light having the first wavelength, a first light detector (4c) generating a first sensing signal (S1) in response to an intensity of light having the first wavelength being applied to the first light detector (4c), a second sensing unit (5) vertically spaced by a given vertical distance (D) from the first sensing unit (4) and comprising: a second laser diode (5a) emitting light having a second wavelength, which is substantially transmitted by the sample container (3) but blocked by the first component (1), a second collimating optics (5b) adapted to collimate the light having the second wavelength, a second light detector (5c) generating a second sensing signal in response to an intensity of light having the second wavelength being applied to the second light detector (5c), a driving unit (6) adapted to move the first sensing unit (4) and the second sensing unit (5) relative to the sample container (3), a position sensing unit (7a, 7b), adapted to output a position sensing signal (z) indicative of a vertical position of the sample container (3), and a vertical position determining unit (8), adapted to match the first sensing signal and the second sensing signal such that first sensing signal and the second sensing signal correspond to identical vertical positions, and calculate the vertical position of the at least one interface (IF) in response to the matched sensing signals and the position sensing signal (z). |
