| 摘要 |
Method and apparatus for measuring the radiation absorption of a fluid specimen and more particularly wherein an electrical signal proportional to the radiant energy received through the fluid specimen is stored and compared with an electrical signal derived from a known reference source, the difference between the signals producing an output signal that is a measure of radiant energy absorbed by the fluid specimen. A pair of capacitors store the electrical signals for comparison and are connected alternately and intermittently to a radiation sensing means by a first pair of gates. A second pair of gates alternately and intermittently energize a pair of radiant energy sources, one source being used as a reference and the other source emitting radiant energy that is transmitted through a specimen fluid undergoing measurement. Both pairs of gates are operated synchronously by a gating circuit that is controlled by a clock and a flip-flop circuit.
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