Position sensitive detector providing position information with enhanced reliability and performance
First Claim
1. A position sensitive anode unit having top, bottom, left and right sides, comprising:
- a plurality of sets of electrode elements formed on a planar surface of a substrate, each set comprising first, second, third and fourth electrode elements electrically isolated from each other, the first and third electrode elements having wedge shapes tapering from the top to the bottom of the unit and the second and fourth electrode elements having wedge shapes tapering from the bottom to the top, the sets arranged adjacent to each other between the left and right sides of the unit, the first and second electrode elements in each set increasing progressively in width from set to set across the unit and the third and fourth electrode elements decreasing progressively in width from set to set across the unit, and electrical conductors connecting together all of the first electrode elements in all of the sets to form a first electrode, all of the second electrode elements in all of the sets to form a second electrode, all of the third electrode elements in all of the sets to form a third electrode, and all of the fourth electrode elements in all of the sets to form a fourth electrode.
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Accused Products
Abstract
A position sensitive detector has one or more wedge-and-wedge anode units, each of which has four electrodes on a planar surface arranged in a plurality of sets of four wedge-shaped electrode elements each, with the sets extending across the anode unit. Two of the electrode elements become progressively wider from set to set from one side of the anode unit to the other, while the other two electrode elements become progressively narrower. The respective electrode elements in each set are electrically connected together to complete the four electrodes. The charge measured on each of the four electrodes can be utilized to determine the X and Y coordinates of an event which results in a charge cloud impacting the anode, with redundant information available from the four electrodes. The coordinates calculated using charge information from any three of the electrodes can be compared with information calculated from the charge measured from the fourth electrode and two of the other electrodes, and the two sets of calculations can be compared. If each set of calculations does not yield the same result, two or more events have occurred simultaneously at different positions, and the measured data can be rejected to avoid erroneous data. The electrodes of large arrays of such anode units can be readily connected together to cover a large detector area with a minimal number of data output lines required, and with the capability of determining the position of simultaneous events by taking advantage of the redundant information available from each anode unit.
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Citations
44 Claims
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1. A position sensitive anode unit having top, bottom, left and right sides, comprising:
a plurality of sets of electrode elements formed on a planar surface of a substrate, each set comprising first, second, third and fourth electrode elements electrically isolated from each other, the first and third electrode elements having wedge shapes tapering from the top to the bottom of the unit and the second and fourth electrode elements having wedge shapes tapering from the bottom to the top, the sets arranged adjacent to each other between the left and right sides of the unit, the first and second electrode elements in each set increasing progressively in width from set to set across the unit and the third and fourth electrode elements decreasing progressively in width from set to set across the unit, and electrical conductors connecting together all of the first electrode elements in all of the sets to form a first electrode, all of the second electrode elements in all of the sets to form a second electrode, all of the third electrode elements in all of the sets to form a third electrode, and all of the fourth electrode elements in all of the sets to form a fourth electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A position sensitive anode array for a detector comprising:
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a plurality of position sensitive anode units arranged in an array of plural adjacent rows and columns of units, each position sensitive anode unit having top, bottom, left and right sides, and comprising a plurality of sets of electrode elements formed on a planar surface of a substrate, each set comprising first, second, third and fourth electrode elements electrically isolated from each other, the first and third electrode elements having wedge shapes tapering from the top to the bottom of the unit and the second and fourth electrode elements having wedge shapes tapering from the bottom to the top, the sets arranged adjacent to each other between the left and right of the unit, the first and second electrode elements in each set increasing progressively in width from set to set across the unit and the third and fourth electrode elements decreasing progressively in width from set to set across the unit, and electrical conductors connecting together all of the first electrode elements in all of the sets to form a first electrode, all of the second electrode elements in all of the sets to form a second electrode, all of the third electrode elements in all of the sets to form a third electrode, and all of the fourth electrode elements in all of the sets to form a fourth electrode; conductors electrically connecting each of the first electrodes in each column of anode units, conductors electrically connecting each of the second electrodes in each row of anode units, conductors electrically connecting each of the third electrodes in each anode unit lying along diagonals of the array in one of the diagonal directions of the array, and conductors electrically connecting the fourth electrodes in anode units lying along the opposite diagonals of the array. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A position sensitive detector comprising:
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(a) means for converting an event impact into an emitted cloud of electrons correlated to the position of impact; (b) a position sensitive anode unit mounted adjacent to the means for converting to receive the cloud of electrons emitted therefrom, the position sensitive anode unit comprising a plurality of sets of electrode elements formed on a planar surface of a substrate, each set comprising first, second, third and fourth electrode elements electrically isolated from each other, the first and third electrode elements having wedge shapes tapering from the top to the bottom of the unit and the second and fourth electrode elements having wedge shapes tapering from the bottom to the top, the sets arranged adjacent to each other between the left and right sides of the unit, the first and second electrode elements in each set increasing progressively in width from set to set across the unit and the third and fourth electrode elements decreasing progressively in width from set to set across the unit, and electrical conductors connecting together all of the first electrode elements in all of the sets to form a first electrode, all of the second electrode elements in all of the sets to form a second electrode, all of the third electrode elements in all of the sets to form a third electrode, and all of the fourth electrodes in all of the sets to form a fourth electrode; and (c) means for measuring the charge on each of the first, second, third and fourth electrodes and means for calculating the position of a charge impact on the anode unit from the measured charges. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A position sensitive detector comprising:
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(a) means for converting an event impact into an emitted cloud of electrons correlated to the position of impact; (b) a plurality of position sensitive anode units arranged in an array of plural adjacent rows and columns, the array of anode units mounted adjacent to the means for converting to receive the cloud of electrons emitted therefrom, each position sensitive anode unit including first, second, third and fourth electrodes, the electrodes arranged such that the signals on the electrodes from a charge cloud impact allow two separate calculations of the X and Y positions of the charge cloud impact to be calculated, and conductors connecting together all of the first electrodes in each column of anode units, each of the second electrodes in each row of anode units, each of the third electrodes in anode units lying along diagonals of the array in one of the diagonal directions of the array, and conductors connecting together the fourth electrodes in anode units lying along the opposite diagonals of the array. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification