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US 8,948,345 B2Granted
X-ray tube high voltage sensing resistor
AssigneeMoxtek, Inc.
InventorDongbing Wang
Life of this patent
Estimating the term…
Abstract
A high voltage sensing resistor disposed on a cylinder that at least partially surrounds an evacuated enclosure of an x-ray tube.
Claims20
An x-ray source comprising:
- a. an electrically insulative cylinder;
- b. an x-ray tube comprising:
- i. an evacuated chamber;
- ii. an anode disposed at one end of the evacuated chamber;
- iii. a cathode disposed at an opposite end of the evacuated chamber from the anode;
- c. the electrically insulative cylinder circumscribing a portion of the evacuated chamber;
- d. a first resistor and a second resistor electrically connected in series;
- e. the first resistor:
- i. comprising a line of electrically insulative dielectric ink painted on a surface of the electrically insulative cylinder;
- ii. having a resistance of at least 10 mega ohms;
- iii. including a first end attached to either the anode or the cathode;
- and
- iv. including a second end electrically connected to a first end of the second resistor;
- f. a resistance of the first resistor is at least 100 times higher than a resistance of the second resistor;
- and
- g. a voltage measurement device connected across the second resistor and configured to measure a voltage across the second resistor.
13 more elements
An x-ray source comprising:
- a. an electrically insulative cylinder;
- b. an x-ray tube comprising:
- i. an evacuated chamber;
- ii. an anode disposed at one end of the evacuated chamber;
- iii. a cathode disposed at an opposing end of the evacuated chamber from the anode;
- c. the electrically insulative cylinder at least partially surrounding the evacuated chamber;
- and
- d. a first resistor:
- i. comprising a line of electrically insulative material, having a length and a diameter and wherein the length is at least 10 times longer than the diameter;
- ii. disposed directly on a surface of the electrically insulative cylinder;
- iii. electrically connected to either the anode or the cathode at one end;
- and
- iv. configured to be electrically connected to an external circuit at an opposing end.
10 more elements
A method for sensing a voltage across an x-ray tube, the method comprising:
- a. painting electrically insulative material on a surface of an electrically insulative cylinder, the electrically insulative material comprising a first resistor, the electrically insulative cylinder surrounding at least a portion of an evacuated chamber of the x-ray tube;
- b. connecting the first resistor to a second resistor at one end and to either a cathode or an anode of the x-ray tube at an opposing end;
- c. connecting an opposing end of the second resistor to ground;
- d. measuring a voltage across the second resistor;
- and
- e. calculating a voltage across the x-ray tube by
- V
- =
- V
- 2
- *
- (
- r
- 1
- +
- r
- 2
- )
- r
- 2
- ,
- wherein V is a voltage across the x-ray tube, V2 is a voltage across the second resistor, r1 is a resistance of the first resistor, and r2 is a resistance of the second resistor.
19 more elements
Dependencies are inferred from the claim text.