CN211576958U - Chemical vapor detector based on temperature gradient sensing array - Google Patents
Chemical vapor detector based on temperature gradient sensing array Download PDFInfo
- Publication number
- CN211576958U CN211576958U CN201922253023.4U CN201922253023U CN211576958U CN 211576958 U CN211576958 U CN 211576958U CN 201922253023 U CN201922253023 U CN 201922253023U CN 211576958 U CN211576958 U CN 211576958U
- Authority
- CN
- China
- Prior art keywords
- temperature gradient
- gradient medium
- medium tube
- excitation light
- chemical vapor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model discloses a chemicals vapour detector based on temperature gradient sensing array relates to fluorescence detection technical field, include: the device comprises an excitation light source, a temperature gradient medium tube, a fluorescent sensitive material, a fluorescent detector, a heating module and a cooling module; the excitation light source is arranged on one side outside the temperature gradient medium tube, and the inner wall of the temperature gradient medium tube is provided with a fluorescent sensitive material; one end of the temperature gradient medium pipe is an air inlet, and the other end of the temperature gradient medium pipe is an air outlet; the heating module is arranged on the outer side wall of the air inlet of the temperature gradient medium pipe; the outer side wall of the air outlet of the temperature gradient medium pipe is provided with the cooling module; the fluorescence detector is arranged at the port of the temperature gradient medium tube. Adopt the device provided by the utility model can realize improving fluorescence sensor's the qualitative ability of chemicals.
Description
Technical Field
The utility model relates to a fluorescence detection technology field especially relates to a chemicals vapour detector based on temperature gradient sensing array.
Background
With the occurrence and the upgrade of international terrorism and armed conflict in partial areas and the manufacture, smuggling and use of various novel drugs in inundation, security departments and import and export control departments in various countries have strong demands for rapidly detecting and characterizing various controlled articles such as explosives, drugs and the like. These controlled items are often concealed by packaging, sealing, etc., which increases the difficulty of being detected. Therefore, trace detector devices capable of detecting detection only by a very small amount of contamination residue, slow permeation, and the like of controlled articles such as drugs, explosives, and the like are gradually beginning to be used and widely accepted.
At present, the successful trace detection means include an ion mobility spectrometry technology and a fluorescence detection technology. Both of them require heating means, etc. to heat chemicals with high vaporization temperature, such as drugs and explosives, etc. to generate a small amount of vapor, and then the vapor enters the detector through the air flow. The ion migration technology uses a radioactive source or the like to ionize water and oxygen molecules in the air and combine the water and oxygen molecules with the vapor of the chemical to be detected to form ion clusters, and the ion clusters are accelerated under the action of an electric field with different migration rates and are collected by a Faraday disk to form current and processed to generate signals. Different substances are distinguished by mobility, but in daily detection, different substances often have similar mobility, the mobility of the same substance can also generate positive or negative shift along with different external environmental conditions, and furthermore, for a mixture frequently encountered in daily detection, a plurality of migration peaks are often formed in an ionization process, so that the single component is difficult to quantify. In addition, the ionization process requires radioactive materials, which are strictly controlled, and the ion mobility equipment usually requires high-volume consumables such as molecular sieves, so that the application of the ion mobility equipment is limited.
The fluorescence detection technology and the 80 th century begin to develop, and the core principle is that a fluorescent material with specific selectivity is designed and becomes a nano material with a microporous structure and a great specific surface area through a material engineering method. When the materials contact with a specific substance at the position of a sensing element in the equipment, the fluorescence of the materials can be changed remarkably, and whether a certain specific substance is detected or not can be judged by monitoring the change of the fluorescence and judging whether the change is consistent with the change rule of a specific detection object or not. The method has the advantages of small equipment volume, light weight and mixture interference resistance, but the types of specific substances cannot be determined frequently, and the method has limited help for further searching and evidence obtaining and the like.
SUMMERY OF THE UTILITY MODEL
The embodiment aims to provide a chemical vapor detector based on a temperature gradient sensing array so as to improve the chemical qualitative capability of a fluorescence sensor.
To achieve the above object, the present embodiment provides the following solutions:
a chemical vapor detector based on a temperature gradient sensing array, comprising: the device comprises an excitation light source, a temperature gradient medium tube, a fluorescent sensitive material, a fluorescent detector, a heating module and a cooling module;
the excitation light source is arranged on one side outside the temperature gradient medium tube, and the inner wall of the temperature gradient medium tube is provided with a fluorescent sensitive material;
the inner wall of the temperature gradient medium pipe is provided with the fluorescent sensitive material;
one end of the temperature gradient medium pipe is an air inlet, and the other end of the temperature gradient medium pipe is an air outlet; the heating module is arranged on the outer side wall of the air inlet of the temperature gradient medium pipe; the outer side wall of the air outlet of the temperature gradient medium pipe is provided with the cooling module; the fluorescence detector is arranged at the port of the temperature gradient medium tube.
Optionally, one or more excitation light sources are provided.
Optionally, the temperature gradient medium tube is a transparent temperature gradient medium tube, and the temperature gradient medium tube is used for transmitting the excitation light emitted by the excitation light source.
Optionally, a first optical filter is further disposed between the excitation light source and the temperature gradient medium tube.
Optionally, the fluorescent sensitive material is arranged on the inner wall of the temperature gradient medium tube in a segmented manner, and the position of the fluorescent sensitive material is the position irradiated by the excitation light source; or the fluorescent sensitive material is continuously distributed on the inner wall of the temperature gradient medium tube.
Optionally, a second optical filter is further disposed between the fluorescence detector and the temperature gradient medium tube.
Optionally, the heating module is one of a resistance heater or an electromagnetic heater.
Optionally, the cooling module is connected to a heat dissipation device having heat dissipation fins and a fan, or connected to a semiconductor thermoelectric device.
According to the specific embodiment provided by this embodiment, this embodiment discloses the following technical effects:
the embodiment provides a chemical vapor detector based on a temperature gradient sensing array, which detects the fluorescent reaction of chemical vapor at different temperatures by setting a temperature field with a temperature gradient, so as to improve the chemical qualitative capability of a fluorescent sensor.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a chemical vapor detector based on a temperature gradient sensing array according to an embodiment of the present invention.
Description of the symbols:
1-heating module; 2-a cooling module; 3-temperature gradient medium pipe; 4-a fluorescent sensitive material; 5-excitation light source; 6-fluorescence detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by persons skilled in the art based on the embodiments in the present embodiment without any creative efforts belong to the protection scope of the present embodiment.
The embodiment aims to provide a chemical vapor detector based on a temperature gradient sensing array so as to improve the chemical qualitative capability of a fluorescence sensor.
In order to make the aforementioned objects, features and advantages of the present embodiment more comprehensible, the present embodiment accompanied with figures and detailed description is described in further detail below.
Example 1
As shown in fig. 1, a chemical vapor detector based on a temperature gradient sensing array comprises: an excitation light source 5, a temperature gradient medium tube 3, a fluorescent sensitive material 4, a fluorescent detector 6, a heating module 1 and a cooling module 2; one excitation light source 5 is arranged; in practical application, the device is also provided with a controller and a motor, wherein the controller controls the motor to work; the motor is also connected with an excitation light source 5, and the controller controls the motor to drive the excitation light source 5 to move left and right along the temperature gradient medium tube 3.
The excitation light source 5 is arranged on one side outside the temperature gradient medium tube 3, and the inner wall of the temperature gradient medium tube 3 is provided with a fluorescent sensitive material 4; the fluorescent sensitive material 4 is arranged on the inner wall of the temperature gradient medium tube 3.
One end of the temperature gradient medium pipe 3 is an air inlet, and the other end of the temperature gradient medium pipe 3 is an air outlet; the heating module 1 is arranged on the outer side wall of the air inlet of the temperature gradient medium pipe 3; the outer side wall of the air outlet of the temperature gradient medium pipe 3 is provided with the cooling module 2; the fluorescence detector 6 is arranged at the air outlet or the air inlet of the temperature gradient medium pipe 3, namely the fluorescence detector 6 is arranged at the port of the temperature gradient medium pipe 3. Because the heating module 1 is arranged at the air inlet, the detection effect realized by arranging the fluorescent detector 6 at the air outlet is better than that of arranging the fluorescent detector at the air inlet. Wherein temperature gradient medium pipe 3 can see through the exciting light to can guarantee to locate the air inlet and the gas outlet outside the gas tightness of part, temperature gradient medium pipe 3 has certain heat capacity, makes it be difficult to receive the temperature influence of the chemical vapour that flows through and change self temperature remarkably, and temperature gradient medium pipe 3 can form the temperature gradient along the air current direction under heating module 1 and cooling module 2 effect.
In addition, the excitation light source 5 may be selected from an LED, a laser, or the like, the excitation light source 5 is used for exciting fluorescence, and the fluorescence detector 6 is selected from a spectrometer, a diode, a photomultiplier, or the like.
Preferably, the temperature gradient medium tube 3 is a transparent temperature gradient medium tube 3, the temperature gradient medium tube 3 is used for transmitting excitation light emitted by the excitation light source 5, and the temperature gradient medium tube 3 can generate an optical waveguide effect in response to fluorescence and can be emitted from an end face of the temperature gradient medium tube 3 close to the fluorescence detector 6.
Preferably, a first filter is further disposed between the excitation light source 5 and the temperature gradient medium tube 3, and the first filter is disposed to prevent light of other wavelengths than the excitation light from entering the fluorescence detector 6.
Preferably, the fluorescent sensitive material 4 is arranged in the temperature gradient medium tube 3 in a segmented manner, and the position of the fluorescent sensitive material 4 is the position irradiated by the excitation light source 5; alternatively, the fluorescent sensing material 4 is continuously distributed in the temperature gradient medium tube 3, wherein the fluorescent sensing material 4 needs to have fluorescence and have measurable sensitive fluorescence response to the target detection object.
Preferably, a second optical filter is further arranged between the fluorescence detector 6 and the temperature gradient medium tube 3, and the second optical filter is used for selectively receiving a certain section of fluorescence spectrum.
Preferably, the heating module 1 is one of an electric resistance type heater or an electromagnetic type heater, such as an electrothermal ceramic heater, for increasing the temperature at the air inlet of the temperature gradient medium tube 3.
Preferably, the cooling module 2 is connected to a heat sink having heat dissipating fins and a fan, or connected to a semiconductor thermoelectric device, for reducing the temperature at the air outlet of the temperature gradient medium tube 3.
In a specific use mode, a trace of detected substances are heated and completely gasified, and steam of the trace of detected substances enters the temperature gradient medium tube 5 from the air inlet, so that the capability of carrying out qualitative analysis on chemicals is improved according to fluorescent response.
Example 2
A chemical vapor detector based on a temperature gradient sensing array, comprising: an excitation light source 5, a temperature gradient medium tube 3, a fluorescent sensitive material 4, a fluorescent detector 6, a heating module 1 and a cooling module 2; the excitation light sources 5 are provided in plurality, and in practical application, a controller is further provided, and the controller controls the excitation light sources 5 to be sequentially turned on.
The excitation light source 5 is arranged on one side outside the temperature gradient medium tube 3, and the inner wall of the temperature gradient medium tube 3 is provided with a fluorescent sensitive material 4; the fluorescent sensitive material 4 is arranged on the inner wall of the temperature gradient medium tube 3.
One end of the temperature gradient medium pipe 3 is an air inlet, and the other end of the temperature gradient medium pipe 3 is an air outlet; the heating module 1 is arranged on the outer side wall of the air inlet of the temperature gradient medium pipe 3; the outer side wall of the air outlet of the temperature gradient medium pipe 3 is provided with the cooling module 2; the fluorescence detector 6 is arranged at the air outlet or the air inlet of the temperature gradient medium tube 3, namely, a port at any end of the temperature gradient medium tube 3. Because the heating module 1 is arranged at the air inlet, the detection effect realized by arranging the fluorescent detector 6 at the air outlet is better than that of arranging the fluorescent detector at the air inlet. Wherein temperature gradient medium pipe 3 can permeate the exciting light to can guarantee to locate the air inlet and the gas tightness of the part beyond the gas outlet, temperature gradient medium pipe 3 has certain heat capacity, makes it be difficult to change self temperature by the temperature influence of the chemical vapour that flows through.
In addition, the excitation light source 5 may be selected from an LED, a laser, or the like, the excitation light source 5 is used for exciting fluorescence, and the fluorescence detector 6 is selected from a spectrometer, a diode, a photomultiplier, or the like.
Preferably, the temperature gradient medium tube 3 is a transparent temperature gradient medium tube 3, the temperature gradient medium tube 3 is used for transmitting excitation light emitted by the excitation light source 5, and the temperature gradient medium tube 3 can generate an optical waveguide effect in response to fluorescence and can be emitted from an end face of the temperature gradient medium tube 3 close to the fluorescence detector.
Preferably, a first filter is further disposed between the excitation light source 5 and the temperature gradient medium tube 3, and the first filter is disposed to prevent light of other wavelengths than the excitation light from entering the fluorescence detector 6.
Preferably, the fluorescent sensitive material 4 is arranged in the temperature gradient medium tube 3 in a segmented manner, and the position of the fluorescent sensitive material 4 is the position irradiated by the excitation light source 5; alternatively, the fluorescent sensing material 4 is continuously distributed in the temperature gradient medium tube 3, wherein the fluorescent sensing material 4 needs to have fluorescence and have measurable sensitive fluorescence response to the target detection object.
Preferably, a second optical filter is further arranged between the fluorescence detector 6 and the temperature gradient medium tube 3, and the second optical filter is used for selectively receiving a certain section of fluorescence spectrum.
Preferably, the heating module 1 is one of an electric resistance type heater or an electromagnetic type heater, for example, an electrothermal ceramic heater, for raising the temperature at the air inlet of the temperature gradient medium tube 3.
Preferably, the cooling module 2 is connected to a heat sink having heat dissipating fins and a fan, or connected to a semiconductor thermoelectric device, for reducing the temperature at the air outlet of the temperature gradient medium tube 3.
The chemical vapor detector based on the temperature gradient sensing array is prepared according to the following principle:
the chemical to be detected is a relatively less volatile substance whose vapour is partly converted to a non-gaseous state by flowing through a temperature gradient, thereby causing a poorer fluorescence response at lower temperatures along the direction of the temperature gradient. Because the steam pressure relation of the different temperatures of material is relevant with the nature of material, consequently under specific temperature gradient, specific material has the fluorescence-temperature gradient decay curve of comparatively characteristic, promptly under specific temperature gradient, the fluorescence-temperature gradient decay curve of different materials is different, and the difference is obvious, the utility model provides a device then promotes the qualitative ability of chemical according to the fluorescence-temperature gradient decay curve that comparatively has the characteristic. In order to enable the device to have temperature gradient, a heating module is arranged near the air inlet of the temperature gradient medium pipe, and a cooling module is arranged near the air outlet, namely, the high-temperature end is arranged near the air inlet, and the low-temperature end is arranged near the air outlet. Therefore, a temperature difference exists between the air inlet and the air outlet of the temperature gradient medium pipe, namely, a temperature gradient exists in the temperature gradient medium pipe.
The specific working mode of the chemical vapor detector based on the temperature gradient sensing array is as follows:
in actual use, the chemical vapor detector based on temperature gradient sensing array still is equipped with the database, is storing in the database under specific temperature gradient, the fluorescence rate of change-temperature gradient eigenvector of common target substance, is in the utility model discloses under the temperature gradient that the device provided, the fluorescence rate of change-temperature gradient eigenvector of common target substance promptly.
The method for calculating the fluorescence response comprises the steps of detecting fluorescence of each position before chemical vapor to be detected enters the temperature gradient medium tube, detecting the fluorescence of each position again after the chemical vapor to be detected completely flows out of the temperature gradient medium tube, and calculating the fluorescence change rate through the change of the fluorescence of each fixed position before and after to obtain the fluorescence change rate-temperature gradient characteristic vector of the chemical to be detected. And comparing the fluorescence change rate-temperature gradient characteristic vector of the chemical to be detected with the fluorescence change rate-temperature gradient characteristic vector of the common target substance in the database by using a correlation coefficient, so as to determine which substance is in the pre-stored database or the chemical to be detected is not in the pre-stored database.
When the detection is carried out, firstly, whether the fluorescence response of the high-temperature end exceeds an alarm threshold value is judged, and if the fluorescence response of the high-temperature end does not exceed the alarm threshold value, the target substance is not detected; and under the condition that the fluorescence change rate-temperature gradient characteristic vector exceeds the threshold value, comparing the fluorescence change rate-temperature gradient characteristic vector of the chemical to be detected with the fluorescence change rate-temperature gradient characteristic vector of the common target substance in the database to obtain a correlation coefficient, so as to determine which substance the chemical to be detected is in the pre-stored database or determine whether the chemical to be detected is not in the pre-stored database.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and implementation of the present embodiment are explained herein by applying specific examples, and the above description of the embodiments is only used to help understanding the method and core ideas of the present embodiment; meanwhile, for a person skilled in the art, according to the idea of the embodiment, the specific implementation and the application range may be changed. In view of the above, the present description should not be construed as limiting the present embodiments.
Claims (8)
1. A chemical vapor detector based on a temperature gradient sensing array, the chemical vapor detector based on a temperature gradient sensing array comprising: the device comprises an excitation light source, a temperature gradient medium tube, a fluorescent sensitive material, a fluorescent detector, a heating module and a cooling module;
the excitation light source is arranged on one side outside the temperature gradient medium tube, and the inner wall of the temperature gradient medium tube is provided with a fluorescent sensitive material;
the inner wall of the temperature gradient medium pipe is provided with the fluorescent sensitive material;
one end of the temperature gradient medium pipe is an air inlet, and the other end of the temperature gradient medium pipe is an air outlet; the heating module is arranged on the outer side wall of the air inlet of the temperature gradient medium pipe; the outer side wall of the air outlet of the temperature gradient medium pipe is provided with the cooling module; the fluorescence detector is arranged at the port of the temperature gradient medium tube.
2. The temperature gradient sensing array based chemical vapor detector of claim 1, wherein the excitation light source is provided in one or more numbers.
3. The chemical vapor detector based on the temperature gradient sensing array of claim 1, wherein the temperature gradient medium tube is a transparent temperature gradient medium tube, and the temperature gradient medium tube is used for transmitting excitation light emitted by the excitation light source.
4. The chemical vapor detector based on the temperature gradient sensing array according to claim 1, wherein a first optical filter is further disposed between the excitation light source and the temperature gradient medium tube.
5. The chemical vapor detector based on the temperature gradient sensing array according to claim 1, wherein the fluorescent sensitive material is arranged on the inner wall of the temperature gradient medium tube in a segmented manner, and the position of the fluorescent sensitive material is the position irradiated by the excitation light source; or the fluorescent sensitive material is continuously distributed on the inner wall of the temperature gradient medium tube.
6. The chemical vapor detector based on the temperature gradient sensing array according to claim 1, wherein a second optical filter is further arranged between the fluorescence detector and the temperature gradient medium tube.
7. The chemical vapor detector based on a temperature gradient sensing array of claim 1, wherein the heating module is one of a resistive heater or an electromagnetic heater.
8. The chemical vapor detector based on the temperature gradient sensing array according to claim 1, wherein the cooling module is connected with a heat sink having heat dissipation fins and a fan, or is connected with a semiconductor thermoelectric device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922253023.4U CN211576958U (en) | 2019-12-16 | 2019-12-16 | Chemical vapor detector based on temperature gradient sensing array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922253023.4U CN211576958U (en) | 2019-12-16 | 2019-12-16 | Chemical vapor detector based on temperature gradient sensing array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211576958U true CN211576958U (en) | 2020-09-25 |
Family
ID=72534550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922253023.4U Active CN211576958U (en) | 2019-12-16 | 2019-12-16 | Chemical vapor detector based on temperature gradient sensing array |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211576958U (en) |
-
2019
- 2019-12-16 CN CN201922253023.4U patent/CN211576958U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Allouch et al. | Transportable, fast and high sensitive near real-time analyzers: Formaldehyde detection | |
| CN110940651B (en) | Method for detecting chemical explosive | |
| EP1120642B1 (en) | Micromachined inferential opto-thermal gas sensor | |
| US5852308A (en) | Micromachined inferential opto-thermal gas sensor | |
| US4019863A (en) | Selective detection of a constituent in an atmosphere | |
| US8088341B2 (en) | Analyte collection devices and methods | |
| CN1145115A (en) | Improved NDIR gas sensor | |
| US11906404B2 (en) | Aerosol and vapor enhanced sample module | |
| CN110940652B (en) | Drug detection method | |
| WO2008091359A2 (en) | Methods and systems for detecting particles | |
| Schutze et al. | Identification of organic solvents by a virtual multisensor system with hierarchical classification | |
| Zhou et al. | Constructing the Phase Diagram of an Aqueous Solution of Poly (N‐isopropyl acrylamide) by Controlled Microevaporation in a Nanoliter Microchamber | |
| CN211576958U (en) | Chemical vapor detector based on temperature gradient sensing array | |
| EP2520922B1 (en) | Sample introducing device of trace detection meter and trace detection meter with sample introducing device | |
| CN211347938U (en) | Chemical vapor detector based on temperature gradient sensing array | |
| Hollmann et al. | Particle balance measurements during detachment in a gas-target divertor simulator | |
| US9157890B2 (en) | Exchange membrane unit and system including exchange membrane unit | |
| EP3465188B9 (en) | Method for determining an absolute gas concentration using a gas sensor arrangement and gas sensor arrangement for determining an absolute gas concentration | |
| US10520440B2 (en) | Gas-phase delivery system for molecule sensing apparatus | |
| Rolin et al. | Mass transport through the carrier gas boundary layer in organic vapor phase deposition | |
| CN207472823U (en) | A kind of high life photoion gas detector | |
| EP0713091A1 (en) | A catalyst assembly | |
| JPS6126854A (en) | Measuring device for component of gas | |
| JP2005024486A (en) | Flow sensor and infrared gas detector using the same | |
| GB2075673A (en) | Apparatus and method for detecting a constituent fluid in a fluid flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |