Method and apparatus for producing an electrical property image using a charge correlation matrix
First Claim
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1. A method for producing an image of an electrical characteristic of an object, the steps comprising:
- a) applying a voltage to the surface of the object with an array of sensor elements;
b) measuring the surface charge at each sensor element that results from the applied voltage;
c) transforming the surface charge measurements;
d) calculating the distribution of charges inside the object by multiplying the transformed surface charge measurements by a stored charge correlation matrix; and
e) producing an image of an electrical property of the object from the internal charge distribution data calculated in step d).
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Abstract
An electrical property imaging system includes an array of sensors placed around an object to measure the surface charges thereon as a sinusoidal voltage is applied thereacross. The resulting distribution of charges inside the object are calculated using a stored charge correlation matrix. Electrical property images are produced from the internal charge distribution image.
21 Citations
14 Claims
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1. A method for producing an image of an electrical characteristic of an object, the steps comprising:
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a) applying a voltage to the surface of the object with an array of sensor elements;
b) measuring the surface charge at each sensor element that results from the applied voltage;
c) transforming the surface charge measurements;
d) calculating the distribution of charges inside the object by multiplying the transformed surface charge measurements by a stored charge correlation matrix; and
e) producing an image of an electrical property of the object from the internal charge distribution data calculated in step d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An imaging system for producing an image of an electrical property of an object which comprises:
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an array of sensor elements for placement in electrical contact with the surface of the object;
means for applying a voltage to the array of sensor elements;
means for measuring the electrical charge at each of the sensor elements while the voltage is applied;
means for transforming the measured electrical charges to a set of transformed surface charges;
a memory storing a charge correlation matrix which relates transformed surface charges at the sensor element to internal charges at an internal array of locations in the object;
means for calculating the distribution of charges at the internal array of locations in the object by multiplying the set of transformed surface charges by the stored charge correlation matrix; and
means for producing an image from the charge distribution by calculating the value of an electrical property at each location in the internal array of locations. - View Dependent Claims (13, 14)
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Specification