High Precision Voltage Source for Electrical Impedance Tomography
First Claim
1. An apparatus comprising:
- a plurality of voltage sources for supplying a corresponding plurality of voltages to a corresponding number of other structures;
voltage source calibration means for calibrating each voltage source; and
switching means for individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition.
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Accused Products
Abstract
An EIT system includes a plurality of voltage sources for supplying a corresponding plurality of voltages to a corresponding number of other structures, voltage source calibration means for calibrating each voltage source, and switching means for individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition. Calibrating respective voltages and currents for each voltage source compensates for shunt impedance of each voltage source. A method for calibrating the system includes individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition for calibrating all of said voltage sources in the same way.
41 Citations
22 Claims
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1. An apparatus comprising:
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a plurality of voltage sources for supplying a corresponding plurality of voltages to a corresponding number of other structures;
voltage source calibration means for calibrating each voltage source; and
switching means for individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for calibrating an apparatus having a plurality of voltage sources for supplying a corresponding plurality of voltages to a corresponding number of other structures, and voltage source calibration means for calibrating each voltage source, the method comprising:
individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition for calibrating all of said voltage sources in the same way. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An electrical impedance imaging apparatus comprising:
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a plurality of voltage sources with shunt impedances for supplying a corresponding plurality of voltages to a corresponding number of other structures, each voltage source including an operational amplifier having an output and a sense resistor connected to the output of the operational amplifier, a buffer amplifier having an input connected to the sense resistor for outputting a measured voltage, and an instrumentation amplifier having one input connected to the operational amplifier output and another input connected to the sense resistor for outputting a measured current;
voltage source calibration means for calibrating each voltage source; and
switching means for individually connecting the calibration means to each voltage source in succession during a period when each other structure is in an inactive condition. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification