CN214503446U - VOCs gas detection system based on ultraviolet light is supplementary goes on - Google Patents
VOCs gas detection system based on ultraviolet light is supplementary goes on Download PDFInfo
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- CN214503446U CN214503446U CN202120146236.1U CN202120146236U CN214503446U CN 214503446 U CN214503446 U CN 214503446U CN 202120146236 U CN202120146236 U CN 202120146236U CN 214503446 U CN214503446 U CN 214503446U
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- 230000008859 change Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims 25
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 10
- 239000011787 zinc oxide Substances 0.000 description 5
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Abstract
The utility model discloses a VOCs gas detection system based on ultraviolet light assistance, which comprises a gas detection device, a mass flow controller, a vacuum pump, a digital source meter, a computer, a plurality of air pipes and a plurality of wires; the gas detection device comprises an LED ultraviolet light source, a sensing element and a quartz sealed cavity, wherein a gas channel allowing target gas to pass through is arranged at the edge of the quartz sealed cavity, and the gas channel comprises at least one inlet and at least one outlet; the mass flow controller is used for controlling the target gas to enter the gas detection device at a specified flow rate; the vacuum pump is used for accelerating gas exchange in the gas detection device; the digital source meter is used for measuring the current of the sensing element; the computer is used for controlling the mass flow controller and the digital source meter.
Description
Technical Field
The utility model relates to a gaseous sensing element technical field particularly relates to a gaseous detecting system of VOCs based on ultraviolet ray driven.
Background
In China, VOCs refer to organic compounds with saturated vapor pressure of more than 70Pa at normal temperature and boiling point of below 260 ℃ at normal pressure, or all organic compounds with vapor pressure more than or equal to 10Pa and volatility and VOCs participate in the formation of ozone and secondary aerosol in atmospheric environment at the temperature of 20 ℃, it has important influence on regional atmospheric ozone pollution and PM2.5 pollution, most VOCs have special unpleasant odor and have toxicity, irritation, teratogenicity and carcinogenic effect, particularly benzene, toluene, formaldehyde and the like can cause great harm to human health, in addition, VOCs are important precursors causing urban haze and photochemical smog and mainly come from the processes of coal chemical industry, petrochemical industry, fuel coating manufacturing, solvent manufacturing and using and the like, therefore, real-time monitoring of the concentration of VOCs is a very important and urgent task.
The gas sensing element is a basic component of an environment monitoring system and is also an important technical basis for realizing automatic control of testing, in an industrial area and a living area, the portable and high-sensitivity gas sensing element can greatly improve the environment monitoring capability, at present, although many technical means can realize detection on VOCs gas with sub-ppm level concentration, such as spectrophotometry, electrochemical detection, gas chromatography, liquid chromatography and the like, the methods have great challenges in cost, operability and portability, and in order to deeply and quantitatively measure gas pollutants, especially gas rich in VOCs, the flammable and explosive characteristics of the VOCs are considered, and a gas detection method with excellent performance at normal temperature is urgently needed to be developed.
The utility model provides a gaseous detecting system of VOCs based on ultraviolet drive adopts the supplementary tradition heating of replacing of ultraviolet ray supplementary, can make the operating temperature of the gas sensing component in this system can reduce to the room temperature to the realization is to the gaseous accurate detection of VOCs.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a gaseous detecting system of VOCs based on supplementary going on of ultraviolet ray realizes surveying VOCs in room temperature environment.
The embodiment of the utility model provides a VOCs gas detection system based on ultraviolet ray is supplementary carries out, including gas detection device, mass flow controller, vacuum pump, digital source table, computer and trachea and wire a plurality of; the gas detection device is used as a gas reaction environment of the sensing element, and a gas channel allowing the target gas to pass through is arranged at the edge of the gas detection device and comprises at least one inlet and at least one outlet; the mass flow controller is used for controlling the target gas to enter the gas detection device at a specified flow rate; the vacuum pump is used for accelerating gas exchange in the gas detection device; the sensing element comprises a quartz substrate, an interdigital electrode and a zinc oxide film coated on the interdigital electrode, the interdigital electrode and the zinc oxide film form a sensitive layer, and the quartz substrate is fixedly adhered in the gas detection device; the LED uv light source is set to 365nm uv light and is used to emit uv light towards the sensitive layer, such that the sensitive layer is in a uv light environment; the digital source meter is used for measuring the current of the sensing element; the computer is used for controlling the mass flow controller and the digital source meter.
Further, the distance between the LED ultraviolet light source arranged in the gas detection device and the sensitive layer is 5 cm.
Further, the LED ultraviolet light source is movably arranged in the gas detection device.
Furthermore, the LED ultraviolet light source and the sensitive layer of the sensing element are both positioned in the center of the plane of the sensing element.
Further, the light spot size of the LED ultraviolet light source is larger than the size of the sensitive layer of the sensing element.
Further, the mass flow controller is arranged outside the gas detection device and used for controlling the target gas and the clean air to enter the gas channel inlet arranged at the edge of the gas detection device at a specified flow rate.
Further, a vacuum pump is used to accelerate gas exchange within the gas detection apparatus.
Further, the digital source meter is connected to two ends of the electrode of the gas sensing element and is used for measuring the current change of the gas sensing element in the target gas after voltage is applied.
Further, the computer is used for controlling the mass flow controller and the digital source meter, and further processing and analyzing the measurement result of the digital source meter.
By above the utility model discloses a supplementary VOCs gas detection system who goes on based on ultraviolet ray of embodiment, it can block the interference of factors such as external light source, dust to sensing element effectively, improves and surveys and discern the gaseous accuracy and the sensitivity of VOCs to can reach sub-ppm's detection to the gaseous room temperature of VOCs under 365 nm's ultraviolet ray light field, and have good sensitivity, can remove the potential safety hazard that common high temperature operational environment brought from.
In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below.
Fig. 1 shows a schematic structural diagram of a system for detecting VOCs based on uv-assisted detection according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of a gas detection device according to an exemplary embodiment of the present invention.
Fig. 3 shows a schematic structural diagram of a sensing element according to an exemplary embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout, and which are illustrated in the following description with reference to the accompanying drawings, and which are intended to illustrate the present invention only and not to be construed as limiting the present invention.
Combine figure 1, 2, 3 to show, according to the utility model discloses the gaseous detection system of zinc oxide base sensing element under the ultraviolet ray auxiliary mode of exemplary embodiment can block the interference of factors such as external light source, dust to sensing element effectively, improves the accuracy and the sensitivity of surveying and discerning VOCs gas to can reach sub-ppm's detection to VOCs gas room temperature under 365 nm's ultraviolet ray, and have good sensitivity, can remove the potential safety hazard that common high temperature operational environment brought from.
In connection with the embodiment shown in fig. 1, the utility model provides a structure of VOCs gas detection system based on ultraviolet ray is supplementary to be gone on includes gas detection device 10, mass flow controller 20, vacuum pump 30, digital source table 40, computer 50 and trachea 60 and wire 70 are a plurality of, utilize computer 50 to control mass flow controller 20 and digital source table 40, wherein mass flow controller 20 is used for controlling the target gas and gets into gas detection device 10 with appointed flow, digital source table 40 switches on the electrode both ends of gas detection device 10, be used for measuring the current change of gas sensing element 11 in the target gas after exerting voltage, vacuum pump 30 is used for accelerating the gas exchange in the gas detection device 10.
Referring to fig. 1, a gas detection device 10 is used as a gas reaction environment of a sensing element 11, and a gas channel allowing a target gas to pass through is arranged at the edge of the gas detection device 10, and the gas channel comprises at least one inlet and at least one outlet, and in an alternative embodiment, the inlet and the outlet are designed in a manner that a gas pipe 80 is communicated, the gas flow at the inlet is controlled by a mass flow controller 20, and the outlet is communicated with a vacuum pump 30 to accelerate the gas exchange in the gas detection device 10.
Referring to fig. 1, the digital source meter 40 is connected to both ends of the electrode of the gas detecting device 10 to form a measuring circuit for measuring a current change of the gas detecting device 10 after contacting the target gas after applying a voltage, and the mass flow controller 20 is configured to control the target gas and the clean air to enter the gas channel inlet provided at the edge of the gas detecting device 10 at a predetermined flow rate.
In addition, the digital source meter 40 and the mass flow controller 20 are connected to the computer 50 by a plurality of leads 90 in a corresponding manner, so that the computer 50 can control the gas flow rate output by the mass flow controller 20, adjust the measurement accuracy and mode of the digital source meter 40, and read and store experimental data acquired by the digital source meter 40.
Referring to fig. 2, the gas detection device 10 includes a sensing element 11, an LED ultraviolet light source 12 and a quartz casing 13, the quartz casing 13 of the gas detection device 10 is made of high-purity quartz crystal, so that the gas detection device 10 is used as a working environment of the sensing element 11 disposed in the device casing, and can ensure that interference of external light sources, dust and other factors on the sensing element 11 can be effectively blocked, the sensing element 11 is used for detecting whether the gas entering the gas detection device 10 contains VOCs gas and content, the LED ultraviolet light source 12 is movably disposed in the gas detection device 10, the wavelength of the ultraviolet light can be set and fixed to 365nm, the distance between the LED ultraviolet light source 12 and the sensing element 11 is 5cm, of course, when different light intensities are required according to experimental requirements, the distance between the LED ultraviolet light source 12 and a sensitive layer of the sensing element 11 can be adjusted by moving up and down, the light spot size of the LED ultraviolet light source 12 is larger than the size of the sensitive layer of the sensing element 11, and the LED ultraviolet light source and the sensitive layer are both located at the center of the plane of the sensing element 11, and the LED ultraviolet light source arranged outside the gas detection device 10 can effectively reduce the working temperature required by the sensing element 11 arranged in the cavity to room temperature.
Referring to fig. 1 and 2, a specific uv-assisted VOCs gas detection system is implemented by controlling a mass flow controller 20 by a computer 50 to make a target gas enter a gas detection device 10 at a specified flow rate, driving a sensing element 11 to contact and react with the target gas under the drive of uv light emitted from an LED uv light source 12, wherein a digital source meter 40 is connected to two ends of an electrode of the sensing element 11 to detect a current change of the sensing element 11 in a measurement circuit and transmit the current change to the computer 50 in real time, a vacuum pump 30 is connected to a gas channel outlet provided at an edge of the gas detection device 10 to accelerate gas exchange in the gas detection device 10, and when a current signal transmitted from the digital source meter 40 to the computer 50 tends to be stable during the detection of the target gas, the computer 50 controls a mass flow controller 80 to close the inflow of the target gas, and introducing clean air to the gas channel inlet arranged at the edge of the gas detection device 10 until the current signal transmitted to the computer 50 by the digital source meter 40 is stable again, namely completing one experiment.
Referring to fig. 3, the sensing element 11 includes a quartz substrate 111, an interdigital electrode 112, and a zinc oxide thin film 113 coated on the interdigital electrode 112, the interdigital electrode 112 and the zinc oxide thin film 113 form a sensitive layer, the quartz substrate 111 is adhesively fixed (for example, glued and fixed) in the gas detection device 10, and the sensing element 11 can achieve the same gas sensing effect in a high-temperature environment under the drive of ultraviolet light with a wavelength of 365nm, so that the detection system can achieve the detection of VOCs at normal temperature.
The above embodiments only represent embodiments of the present invention, and the description thereof is more specific and detailed, but it cannot be understood as the limitation of the scope of the present invention, it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, and all of them belong to the protection scope of the present invention.
Claims (7)
1. A VOCs gas detection system based on ultraviolet light assistance comprises a gas detection device, a mass flow controller, a vacuum pump, a digital source meter, a computer, a plurality of gas pipes and a plurality of leads; the gas detection device comprises an LED ultraviolet light source, a sensing element and a quartz sealed cavity, wherein a gas channel allowing target gas to pass through is arranged at the edge of the quartz sealed cavity, and the gas channel comprises at least one inlet and at least one outlet; the mass flow controller is used for controlling the target gas to enter the gas detection device at a specified flow rate; the vacuum pump is used for accelerating gas exchange in the gas detection device; the digital source meter is used for measuring the current of the sensing element; the computer is used for controlling the mass flow controller and the digital source meter.
2. The uv-assisted detection system for the gases of VOCs according to claim 1, wherein the gas detection device comprises a sensor element and an LED uv light source, and the distance between the LED uv light source and the sensor element is 5 cm.
3. A uv-assisted-based VOCs gas detection system as claimed in claim 1 wherein the LED uv light source is removably disposed within the gas detection device.
4. A uv-assisted VOCs gas detection system as claimed in claim 1, wherein the LED uv light source and the sensing layer of the sensing element are both located at the center of the plane of the sensing element.
5. A uv-assisted detection system for gases from VOCs according to claim 1 wherein the spot size of the LED uv source is larger than the size of the sensitive layer of the sensing element.
6. A uv-assisted-based VOCs gas detection system as claimed in claim 1, wherein mass flow controllers are disposed outside the gas detection unit for controlling the target gas and the clean air to enter the gas channel inlets disposed at the edge of the gas detection unit at a predetermined flow rate.
7. A uv-assisted detection system for VOCs gases as claimed in claim 1 wherein the digital source meter is connected across the electrodes of the sensing element for measuring the change in current in the target gas from the gas sensing element after applying a voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120146236.1U CN214503446U (en) | 2021-01-20 | 2021-01-20 | VOCs gas detection system based on ultraviolet light is supplementary goes on |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120146236.1U CN214503446U (en) | 2021-01-20 | 2021-01-20 | VOCs gas detection system based on ultraviolet light is supplementary goes on |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214503446U true CN214503446U (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120146236.1U Expired - Fee Related CN214503446U (en) | 2021-01-20 | 2021-01-20 | VOCs gas detection system based on ultraviolet light is supplementary goes on |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214503446U (en) |
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2021
- 2021-01-20 CN CN202120146236.1U patent/CN214503446U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211026 |
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| CF01 | Termination of patent right due to non-payment of annual fee |