| 摘要 |
1. Signal processing circuit for processing the output signal of a detector (12) inert and/or subjected to a memory effect, to which a measuring quantity is applied, which assumes a measuring and a reference value, respectively, in measuring and reference time intervals (24 and 22, respectively) periodically consecutive, having a) an integrator (10) adapted to be reset, for integrating the output signal from the detector (12) during each measuring and each reference time interval. b) a first and a second memory circuit (32 and 34 ; respectively) adapted to be connected to the output of the integrator (10), c) a sequence control (14) for controlling the resetting of the integrator (10) and the connection of the first and second memory circuits (32 and 34, respectively) to the integrator, characterized in that d) a clamp circuit (16) is provided, which is adapted to clamp the output signal from the detector (12) to a base line before it is supplied to the integrator (10), e) the output (72) of the clamp circuit (16) is adapted to be connected to the integrator (10) either directly through a first switch (18) or through a second switch (20) serially arranged with an inverting amplifier (96), f) the sequence control (14) is adapted to generate the following control signals : (i) a first control signal (3) for closing the first switch (18) during the measuring and reference time intervals (24 and 22, respectively) following each other with time intervals therebetween, (ii) a second control signal (2) for closing the second switch (20) before each measuring and each reference time interval for a predetermined compensation time interval (26, 28), (iii) a third control signal (1) for energizing the clamp circuit (16) before each measuring, each reference and each compensation time interval, (iv) a fourth control signal (4, 5) for causing the output signal from the integrator (10) to be transferred to the first memory circuit (32) after each measuring time interval and into the second memory circuit (34) after each reference time interval, (v) a fifth control signal (6) for resetting the integrator (10) after its output signal has been transferred to one of the memory circuits (32, 34). |
