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Method and device for detecting and identifying not easily volatilized substances in a gas phase by means of surface-enhanced vibration spectroscopy

A volatile substance and optical detection technology, applied in the field of hazardous substances, can solve problems such as difficult and dangerous substance delivery measurement units

Inactive Publication Date: 2016-03-09
LASER LAB GOTTINGEN EV LLG +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Many hazardous substances, such as explosives based on RDX (cyclotrimethylenetrinitramine), have only a low vapor pressure, so that this hazardous substance in the gas phase tends to be adsorbed already on the walls of the gas guiding channel, making it difficult to remove all Transport of the hazardous substances mentioned above into the measuring cell

Method used

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  • Method and device for detecting and identifying not easily volatilized substances in a gas phase by means of surface-enhanced vibration spectroscopy
  • Method and device for detecting and identifying not easily volatilized substances in a gas phase by means of surface-enhanced vibration spectroscopy
  • Method and device for detecting and identifying not easily volatilized substances in a gas phase by means of surface-enhanced vibration spectroscopy

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Embodiment Construction

[0052] Samples in the gaseous state are directly sucked in according to figure 1 The measurement unit 2 of the device. Otherwise, the sample is conveyed by means of an absorbent fleece into a thermal desorber 12 or thermal desorber. In the thermal desorber 12 , the substances contained in the sample are heated and desorbed, wherein in the case of RDX-based explosives a desorption temperature of >200° C. results. The gas phase encloses the desorbed sample in the air sucked in through the inlet 3 , while said gas phase is conveyed on from the thermal desorber 12 to the plasma surface 1 arranged in the measuring cell 2 . The suction is controlled by means of an air pump 4 .

[0053] Here, the measuring cell 2 and the gas supply and gas removal devices 14 , 15 connected to the measuring cell 2 pass through figure 1 The heating element 8 shown only schematically in the figure is used for heating. For the airborne delivery of low-volatility explosives such as RDX, heating to tem...

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Abstract

The invention relates to the identifying of not easily volatilized substances, in particular hazardous materials, in a gas phase. A measurement cell (2) and a gas supply device (14) connected to the measurement cell (2) are heated and a plasmonic surface (1) arranged in the measurement cell (2) is temperature-controlled such that the plasmonic surface (1) has a lower temperature than the measurement cell (2) and the gas supply device (14). The gas phase is guided through the gas supply device (14) into the measurement cell (2) in such a manner that the gas phase reaches the temperature-controlled plasmonic surface (1). Substances adsorbed from the gas phase on the plasmonic surface (1) are analyzed by an optical process. Surface-enhanced Raman spectroscopy or surface-enhanced infrared spectroscopy can be used as the optical process. Selectivity can be increased by combining both methods. Selectivity can be additionally increased by using a gas detector, preferably an ion-mobility spectrometer, along with one or both optical processes, and thus the false alarm rate reduced without loss of time.

Description

technical field [0001] The invention relates to a method for confirming the presence of less volatile substances, especially hazardous substances, in the gas phase. The less volatile species may already be present in the gas phase or have just been converted into the gas phase. Background technique [0002] This method and the associated device are used to identify and identify chemical substances or compounds, in particular explosive and / or health-hazardous substances, such as toxic industrial chemicals, chemical warfare agents or narcotics. [0003] Proofs for explosive and / or extremely toxic chemical compounds need to have 9 ), especially when the substance in question, such as plastic explosives, has an extremely low vapor pressure. Spectrometers are often used to identify and document the chemical compounds. [0004] If the substance to be tested is sufficiently present, methods such as FTIR (Fourier Transform Infra Red Spektroskopie, Fourier Transform Infrared Spect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01N21/65
CPCG01N21/3504G01N2021/1734G01N2201/024G01N21/658G01N33/227G01N2021/258G01N2201/06113
Inventor H·瓦克巴尔特L·冈德鲁姆B·翁格蒂姆W·明希迈尔A·沃尔特
Owner LASER LAB GOTTINGEN EV LLG
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