| 摘要 |
A d.c. coupled radiation scanning system having a plurality of radiation detector elements, a multiplexer and a scanned raster display device, including a circuit for compensating for variation in transfer characteristics of the detector elements. The compensating circuit monitors the voltage from each detector element, and derives and measures a voltage function therefrom in synchronism with the multiplexer. The voltage function may be average voltage or the average of the squares of voltages. Additionally, the mean value of all the measured voltage functions is determined over a succession of multiplexer time intervals, each measured value is compared against this mean value and the succession of error signals resulting therefrom is used to modify the signal output from the multiplexer and fed to the video input of the display device. The resultant display is thus compensated against spurious patterns, such as lininess or streaks, imposed as a result of differences in the transfer characteristics of the detector elements and the associated electronics.
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