| 摘要 |
An improved electro-optical detection system is disclosed capable of use in a fluorescent polarization instrument. In a single or dual channel system, an integrated photodetector/amplifier is combined with a linear charge-balancing voltage-to-frequency converter to produce a digital frequency indicative of the intensity of polarized fluorescence emmited by a chemically treated body fluid sample, such as blood, upon light excitation thereof. A chopper-stabilized amplifier is further connected to the input of the voltage-to-frequency converter for automatically correcting input offset currents and temperature drift. The digital frequency is counted and the data corresponding thereto is transferred via bus connection to a microcomputer for evaluation and display.
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