The United States of America as represented by the United States Department of Energy
인용정보
피인용 횟수 :
19인용 특허 :
11
초록▼
A water trap system based on a thermoelectric cooling device is employed to remove a major fraction of the water from air samples, prior to analysis of these samples for chemical composition, by a variety of analytical techniques where water vapor interferes with the measurement process. These analy
A water trap system based on a thermoelectric cooling device is employed to remove a major fraction of the water from air samples, prior to analysis of these samples for chemical composition, by a variety of analytical techniques where water vapor interferes with the measurement process. These analytical techniques include infrared spectroscopy, mass spectrometry, ion mobility spectrometry and gas chromatography. The thermoelectric system for trapping water present in air samples can substantially improve detection sensitivity in these analytical techniques when it is necessary to measure trace analytes with concentrations in the ppm (parts per million) or ppb (parts per billion) partial pressure range. The thermoelectric trap design is compact and amenable to use in a portable gas monitoring instrumentation.
대표청구항▼
What is claimed is: 1. A thermoelectrically cooled water trap, comprising: a metal plate having a first side, a second side, top and a bottom, the metal plate further having a continuous cavity of specified shape, the cavity having a inlet end and outlet end which extend out of the plate's cavity;
What is claimed is: 1. A thermoelectrically cooled water trap, comprising: a metal plate having a first side, a second side, top and a bottom, the metal plate further having a continuous cavity of specified shape, the cavity having a inlet end and outlet end which extend out of the plate's cavity; a metal pipe having a shape that is complementary to the shape of the metal plate's cavity, the metal pipe having an inlet end and an outlet end, the metal pipe being mounted within the metal plate's cavity, the length of the pipe being in physical contact with the plate with the exception of the inlet and outlet ends which extend out of the plate's cavity; and a thermoelectric cooler assembly having a first side and a second side, the first side of the cooler assembly being coupled to the first side of the metal plate; and an analytic measuring device, the analytic measuring device having a sample line, the sample line being connected to the inlet and outlet ends of water trap's pipe so that the sample passes through the water trap before being analyzed, the analytic device having a by-pass line that by-passes the water trap when desirous; wherein the temperature of the pipe is between-5째 and-30째 C. during normal operation. 2. A thermoelectrically cooled water trap as described in claim 1, further comprising a heat sink, the heat sink having a first side and a second side, the first side of the heat sink being in physical contact with and coupled to the second side of the cooler assembly. 3. A thermoelectrically cooled water trap as described in claim 2, wherein the second side of the heat sink has a series of fins which augment heat dispersal. 4. A thermoelectrically cooled water trap as described in claim 2, wherein the heat sink is aluminum. 5. A thermoelectrically cooled water trap as described in claim 2, wherein the first side of the heat sink is attached to the second side of the cooler assembly using fasteners. 6. A thermoelectrically cooled water trap as described in claim 2, further comprising a fan, the fan having a first and second side, the first side being coupled to the second side of the heat sink, the fan augmenting heat dispersal. 7. Thermoelectrically cooled water trap as described in claim 1, wherein the analytic measuring device is an infrared spectroscopic gas analyzer. 8. A thermoelectrically cooled water trap as described in claim 1, wherein the cavity of the metal plate has a shape with at least one bend, the shape allowing for a long pathlength through the plate. 9. A thermoelectrically cooled water trap as described in claim 1, wherein the metal pipe is w-shaped. 10. A thermoelectrically cooled water trap as described in claim 1, wherein the cavity originates at the top of the plate, winds through the central portion of the plate, and terminates at the top of the plate. 11. A thermoelectrically cooled water trap as described in claim 1, wherein the metal plate is manufactured of a metal having high-thermal conductivity. 12. A thermoelectrically cooled water trap as described in claim 1, wherein the metal plate is manufactured of copper. 13. A thermoelectrically cooled water trap as described in claim 1, wherein the metal pipe is manufactured of a metal having high thermal conductivity. 14. A thermoelectrically cooled water trap as described in claim 1, wherein the metal pipe is manufactured of copper. 15. A thermoelectrically cooled water trap as described in claim 1, wherein the pipe is coupled to the plate using Sb/Sn solder. 16. A thermoelectrically cooled water trap as described in claim 1, where the inlet and outlet ends of the pipe extend out of the plate a sufficient distance to allow connection of the ends to a tube. 17. A thermoelectrically cooled water trap as described in claim 1, wherein a thin coat of thermal interface material is applied to the first and second sides of the cooler assembly. 18. A thermoelectrically cooled water trap as described in claim 1, wherein the thermoelectric cooler assembly is a Peltier device. 19. A thermoelectrically cooled water trap as described in claim 1, wherein the first side of the cooler assembly is coupled to the first side of the plate using fasteners. 20. A thermoelectrically cooled water trap as described in claim 1, wherein the temperature of the pipe is lower than the dew point of the sample air. 21. A thermoelectrically cooled water trap as described in claim 1, wherein the temperature of the pipe is lower than room temperature, during normal operation. 22. A thermoelectrically cooled water trap as described in claim 1, wherein the analytic measuring device is used for infrared spectroscopy, mass spectrometry, ion mobility spectrometry or gas chromatography. 23. A thermoelectrically cooled water trap as described in claim 1, wherein the temperature of the pipe is between-5 and 10째 C., during normal operation. 24. A thermoelectrically cooled water trap as described in claim 1, wherein the partial pressure of an analyte being measured is less than the equilibrium vapor pressure of the analyte. 25. A thermoelectrically cooled water trap as described in claim 1, wherein an analyte being measured has a concentration less than 200 ppm, by partial pressure. 26. A thermoelectrically cooled water trap as described in claim 1, wherein an analyte being measured has a concentration of less than 100 ppm, by partial pressure. 27. A thermoelectrically cooled water trap as described in claim 1, wherein the first side of the cooler assembly has a lower temperature than the second side of the assembly, during normal operation.
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이 특허에 인용된 특허 (11)
Mark A. Logan ; Lloyd F. Wright, Compact volatile organic compound removal system.
Geiss Manfred (Frankfurt am Main DEX) Heide Wolfgang (Darmstadt DEX) Wittekind Jurgen (Frankfurt am Main DEX) Breetz Michael (Steinberg DEX), Temperature controlled pipette tube.
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