SENSOR ARRANGEMENT
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Abstract
Utilisation of electrostatic sensor elements in an array to provide an electrostatic image is known. Problems can arise with respect to cross talk between electrostatic sensor elements and as a result of external electrical sources. By providing a differential input amplifier and taking output signals from adjacent or adjoining sensor elements to providing a differential signal it is possible to improve images. Furthermore, the differential input amplifier incorporates decoupling devices such as capacitors to reduce noise within the output and input signals and the aspect ratio of the sensor in terms of depth to width can also aid reduction in noise levels.
31 Citations
42 Claims
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1-24. -24. (canceled)
- 25. A sensor comprising an array of electrostatic sensor elements, each sensor element capable of producing a respective output signal when the sensor is directed to a region of an object being sensed, the output signals being separately available at the sensor output to provide information relating to the electrostatic charge distribution across the region, the sensor characterised in that at least two electrostatic sensor element are interlinked by means of a differential input charge amplifier, and each input to the differential input charge amplifier includes a decoupling device.
Specification