Surface area deposition trap
First Claim
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1. A pressure transducer assembly, comprising:
- A) a housing;
B) a pressure sensor disposed in the housing;
C) a coupling between the housing and an external source of gas or fluid, the coupling and housing establishing a sealed pathway between the external source and the pressure sensor;
D) a deposition trap disposed in the pathway, the deposition trap defining a plurality of channels formed by a plurality of tubes, each of the tubes having an inner surface and an outer surface, and each of the channels being narrower than the pathway, wherein the particulates can be deposited on at least a portion of the inner and outer surface of the tubes during operation of the transducer assembly.
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Abstract
The disclosed pressure transducer assembly includes a housing, a pressure sensor disposed within the housing, a coupling establishing a sealed pathway between the housing and an external source of gas or fluid, and a deposition trap disposed in the pathway. The deposition trap provides a plurality of channels, each of the channels being narrower than the pathway.
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Citations
36 Claims
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1. A pressure transducer assembly, comprising:
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A) a housing; B) a pressure sensor disposed in the housing; C) a coupling between the housing and an external source of gas or fluid, the coupling and housing establishing a sealed pathway between the external source and the pressure sensor; D) a deposition trap disposed in the pathway, the deposition trap defining a plurality of channels formed by a plurality of tubes, each of the tubes having an inner surface and an outer surface, and each of the channels being narrower than the pathway, wherein the particulates can be deposited on at least a portion of the inner and outer surface of the tubes during operation of the transducer assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A pressure transducer, comprising:
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(A) a pressure sensor; (B) a coupling defining an internal passage, the coupling being connectable to an external source of gas or fluid, a pressure of the gas or fluid being less than 0.02 Torr, the internal passage providing at least a portion of a sealed pathway between the external source and the sensor when the coupling is connected to the external source; (C) a deposition trap defining a plurality of channels formed of a plurality of tubes, the tubes having an inner surface and an outer surface, the structure being mounted without welding to the coupling such that molecules flowing through the internal passage pass through the channels before reaching the sensor, wherein the particulates can be deposited on at least a portion of the inner and outer surface of the tubes during operation of the transducer assembly. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 34, 35)
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28. A transducer comprising:
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(A) a housing; (B) a flexible diaphragm disposed in the housing, the diaphragm defining a first chamber and a second chamber within the housing; (C) a conductor disposed in the second chamber, the diaphragm and conductor being characterized by a capacitance; (D) an inlet tube configured to provide at least a portion of a sealed path between the first chamber and an external source of gas or fluid, a pressure of the gas or fluid in the external source being less than 0.02 Torr, the capacitance changing in response to changes in the pressure; and (E) a deposition trap defining a plurality of channels formed of a plurality of tubes, each of the tubes having an inner surface and an outer surface, each of the channels being narrower than the path, the structure being mounted without welding in the path such that molecules flowing from the external source to the first chamber pass through the channels, wherein the particulates can be deposited on at least a portion of the inner and outer surface of the tubes during operation of the transducer assembly. - View Dependent Claims (29, 30, 31, 32, 33)
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36. A pressure transducer assembly, comprising:
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A) a housing; B) a pressure sensor disposed in the housing; C) a coupling between the housing and an external source of gas or fluid, the coupling and housing establishing a sealed pathway between the external source and the pressure sensor; D) a deposition trap disposed in the pathway, the deposition trap defining a plurality of tubes formed by a rolled corrugated sheet forming a plurality of trapping surfaces, each of the channels being narrower than the pathway.
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Specification