Ionization-based detection
First Claim
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1. An integrated detector structure comprising:
- a photo-ionization detector (PID);
an electron capture detector (ECD);
a vacuum ultra violet (VUV) source, wherein the VUV source is an ionization source for both the PID and ECD and wherein the PID and ECD are integrated under the VUV source, and a sample channel with sample inlet and sample outlet, the PID at a first location within the sample channel and the ECD at a second location within the sample channel, and wherein the ion and electron pairs created by the photoionization within the sample channel are collected by the PID electrodes and wherein photoelectrons that are knocked off by the PID electrodes are subsequently collected by the ECD electrodes.
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Abstract
Embodiments of the present invention relate to detector structures for use in a micro gas analyzer, preferably in a differential setup. The detector structures may comprise one or more detector types, such as photo-ionization (PID), electron capture (ECD), ion mobility (IMS), differential mobility (DMS), ion-trap mass spectrometer (ITMS), in which all are provided with ions and electrons from one vacuum ultra violet (VUV) source. This source may also provide ions for ion-based gas pumps.
53 Citations
20 Claims
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1. An integrated detector structure comprising:
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a photo-ionization detector (PID); an electron capture detector (ECD); a vacuum ultra violet (VUV) source, wherein the VUV source is an ionization source for both the PID and ECD and wherein the PID and ECD are integrated under the VUV source, and a sample channel with sample inlet and sample outlet, the PID at a first location within the sample channel and the ECD at a second location within the sample channel, and wherein the ion and electron pairs created by the photoionization within the sample channel are collected by the PID electrodes and wherein photoelectrons that are knocked off by the PID electrodes are subsequently collected by the ECD electrodes. - View Dependent Claims (2, 3, 4, 5)
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6. An integrated micro analyzer, comprising:
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a sample inlet, wherein a sample enters the micro analyzer; a sample channel, wherein the sample is contained and flows through the micro analyzer; a sample exit, wherein the sample exits the micro analyzer; a photo-ionization detector (PID), coupled at or near the sample exit at a first location within the sample channel; an electron capture detector (ECD), coupled at or near the sample exit at a second location within the sample channel; and a vacuum ultra violet (VUV) source, wherein the VUV source is an ionization source for the detectors, and wherein the PID and ECD are integrated under the VUV source, and wherein the ion and electron pairs created by the photoionization within the sample channel are collected by the PID electrodes and wherein photoelectrons that are knocked off by the PID electrodes are subsequently detected by the ECD electrodes. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An integrated micro analyzer, comprising:
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a sample inlet, wherein a sample enters the micro analyzer; a sample channel, wherein the sample is contained and flows through the micro analyzer; a sample exit, wherein the sample exits the micro analyzer; a photo-ionization detector (PID), coupled at or near the sample inlet and exit at a first location within the sample channel; an electron capture detector (ECD), coupled at or near the sample inlet and exit at a second location within the sample channel; a micro discharge detector (MDD), coupled at or near the sample inlet and exit; an ion mobility spectrometer (IMS), coupled at or near the sample inlet and exit; an ion trap mass spectrometer (ITMS), coupled at or near the sample inlet and exit; a differential (ion) mobility spectrometer (DMS), coupled at or near the sample inlet and exit; and a vacuum ultra violet (VUV) source, wherein the VUV source is an ionization source for the above detectors, and wherein the PID, ECD, MDD, IMS, ITMS, and DMS are integrated under the VUV source, and wherein the ion and electron pairs created by the photoionization within the sample channel are collected by the PID electrodes and wherein photoelectrons that are knocked off by the PID are collected by the ECD, MDD, IMS, ITMS, and DMS electrodes.
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18. A method for analyzing a sample, comprising:
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flowing a sample into a gas chromatography (GC) sample channel, sufficient to separate the sample components; contacting a sample with at least one PID and ECD, sufficient to measure the desired properties (elution time and concentration) of the sample components, wherein the PID and ECD utilize the same VUV source for ionization, and wherein the PID and ECD are integrated under the VUV source, and wherein the ion and electron pairs created by the photoionization within the sample channel are collected by the PID electrodes and wherein the photoelectrons that are knocked off by the PID are subsequently collected by the ECD electrodes. - View Dependent Claims (19, 20)
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Specification