| 摘要 |
A system for detecting the presence of a substantially transparent object includes a radiation source producing radiation at a predetermined bandwidth, and a radiation receiver is positioned to receive radiation from the radiation source. An opening is formed between the radiation receiver and the radiation source sized to allow a substantially transparent object such as a sample or reagent tip to slide between the radiation receiver and the radiation source. At least one polarizing filter is positioned between the radiation receiver and the opening, whereby a change in intensity of radiation received by the radiation receiver due to the presence or absence of the transparent object can be detected.
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