Electronic sampling circuit |
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| 申请号 | EP98202715.3 | 申请日 | 1998-08-13 | 公开(公告)号 | EP0898375A3 | 公开(公告)日 | 2002-10-02 |
| 申请人 | EASTMAN KODAK COMPANY; | 发明人 | Fuggle, Graham Anthony; Law, Derek; Edwards, Stephen John; | ||||
| 摘要 | An electronic sampling circuit for determining redox potentials, and consequently specie concentration, in a photographic solution, applies a linear ramp of a square wave voltage to a first electrode (6) immersed in the solution. The current drawn by an adjacent electrode (12) is converted to a voltage for sampling. A pair of sample-and-hold circuits (40,42) store signals sampled at the peak and adjacent trough respectively of a square wave pulse, and a subsequent analogue difference circuit (44) subtracts the two signals. The resulting signal is converted to a digital code by a low cost, low bit count analogue-to-digital converter (46), which is stored on a microprocessor (48). The sampling process is repeated for successive square waves along the ramp. This circuit configuration enables the difference between analogue signals to be measured where the signals differ in amplitude by small amounts but have a wide dynamic range, without the need for an expensive, high bit count analogue-to-digital converter. | ||||||
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