CN104614407A - Gas monitoring system - Google Patents
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- CN104614407A CN104614407A CN201510061540.5A CN201510061540A CN104614407A CN 104614407 A CN104614407 A CN 104614407A CN 201510061540 A CN201510061540 A CN 201510061540A CN 104614407 A CN104614407 A CN 104614407A
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Abstract
The invention discloses a gas monitoring system; the gas monitoring system is used for identifying and monitoring target gas or smell in real time; the gas monitoring system comprises a sensor array, a multiplexer and a microprocessor; the sensor array is composed of m sensors capable of generating different responses to different gas in an arranging manner; and the multiplexer is used for selecting a corresponding sensor to identify or monitor target gas or smell according to a control signal sent by the microprocessor. The sensor array in the invention shares a sensor measurement circuit through the multiplexer, so that resources are saved; the multiplexer selectively outputs a corresponding sensor detection signal according to the control signal sent by the microprocessor; a logical relationship is simple and rapid; the multiple kinds of gas can be detected simultaneously; and the miniaturization of the system is realized.
Description
Technical field
The present invention relates to gas-monitoring field, particularly relate to a kind of gas monitoring system.
Background technology
Daily life and activity in production are all closely related with the atmospheric environment of surrounding, and the change of air has great impact to the mankind.Along with industrial scale expands gradually, the kind of product is on the increase, and gaseous species and the quantity of the generation in gas raw material and production run are on the increase, and the especially industrial development such as oil, chemical industry, coal and automobile, causes atmospheric pollution day by day serious.Therefore, carry out precise monitoring to the various gases in human survival and production environment to be very important.
At present, existing gas controlling device can only realize sensor and gas is monitored one to one, monitoring for multiple gases in environment or smell is limited, if need to monitor multiple gases, will use the multiple sensor sensitive to gas with various, namely gas controlling device service efficiency of the prior art is extremely low, cost is high and sensitivity is not high simultaneously.In addition, existing sensor array volume is comparatively large, carries inconvenience, and along with the miniaturization of device in modern society, and this sensor array cannot be integrated with miniature device, and the smell in None-identified environment, therefore, it widely uses to receive and limits definitely.
Summary of the invention
Technical matters to be solved by this invention is how to overcome that existing sensor array volume is comparatively large, selectivity, service efficiency are low, cost is high, poor sensitivity, cannot carry out integrated etc. defect with miniature device.In order to solve the problems of the technologies described above, the invention provides a kind of gas monitoring system, for identifying and Real-Time Monitoring object gas or smell, comprise sensor array, multiplexer and microprocessor, described sensor array produces the different sensor arrangement responded by m to gas with various and forms, and described multiplexer selects corresponding sensor to identify object gas or smell or monitor according to the control signal that microprocessor sends.
Further, described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit be used for by amplify after detection signal be converted to digital signal and by digital data transmission give described first communication module, described AD conversion unit is controlled by microprocessor.
Further, described system also comprises the resistance measuring module for survey sensor array electric resistance, described resistance measuring module one end is connected with AD conversion unit, the other end is connected with sensor array, the range of described resistance measuring module is controlled by microprocessor, described resistance measuring module can be measured a very large range ability measured resistance, also range swithching can be done, wherein the detection signal reaction of the gas that arrives of Sensor monitoring or the smell resistance variations that is sensor.
Further, the signal output part of each sensor in described sensor array is electrically connected with an input end of described multiplexer respectively, described microprocessor is transmitted control signal to multiplexer by n root control line, multiplexer is selected to export the signal that corresponding sensor detects gas or smell, quantity m≤2 of described sensor by described control signal
n-1.
Wherein, the sensor in described sensor array comprises substrate, sensitive layer and at least two electrodes, and described sensitive layer is formed at substrate surface, and described electrode is drawn by sensitive layer.
Further, described microprocessor comprises the first communication module.
Further, described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit is used for the detection signal after amplifying to be converted to digital signal and by digital data transmission to described first communication module.
Further, described system also comprises terminal server, described terminal server comprises signal processing module and the second communication module, described second communication module is for receiving the digital signal of the first communication module transmission, and by described digital data transmission to signal processing module, described signal processing module is used for carrying out treatment and analysis to digital signal.
Particularly, by data array corresponding for described digital signal, { { x}'s described signal processing module compares for p} and setting value, when { p} is with { when x} conforms to, then judge that in current environment, gas concentration is suitable with setting value, when { p} is not with { when x} conforms to, then to data array, { p} stores, thus obtains processing signals.
Further, described terminal server also comprises display module, and described display module is used for the processing signals of Received signal strength processing module transmission and described processing signals is shown, thus draws kind and the concentration information of object gas or smell.
Further, described terminal server also comprises alarm module, and described alarm module is used for the processing signals of Received signal strength processing module transmission and determines whether to report to the police according to described processing signals.
Particularly, described terminal server is provided with the application software for this system development, carries out data transmission between described terminal server and microprocessor by wired or wireless mode.
Described terminal server can comprise the mobile communication equipments such as mobile phone, panel computer, laptop computer, also can comprise the fixed equipment such as desktop computer, desk-top measuring instrument.
Wherein, the sensor in described sensor array comprises substrate, sensitive layer and at least m+1 root (m is the quantity of sensor) electrode, and described sensitive layer is formed at substrate surface, and described electrode is drawn by sensitive layer.Described substrate, for insulate and to have chemically inert substrate, can be flexible substrates or stiff base, and described substrate is the one in dimethyl silicone polymer, polyethylene terephthalate, polyimide or PCB substrate material, and described sensitive layer is SnO
2, ZnO, In
2o
3metal oxide, or the SnO mixing Cu, Zn, Fe, Co, Ni
2, ZnO, In
2o
3metal oxide can also be Graphene, carbon nano-tube, metal (oxide) nano wire (or band) or doping or grapheme modified and doping or carbon nano-tube modified.
Gas monitoring system of the present invention, has following beneficial effect:
1, the sensor array in the present invention shares a set of metering circuit by a multiplexer, economizes on resources, reduces cost, makes sensor chip miniaturization simultaneously.
2, multiplexer of the present invention is selected to export corresponding sensor detection signal according to the control signal that microprocessor sends, logical relation simple and fast, multiple gases can be detected simultaneously, realize the miniaturization of device, and described resistance measuring module directly can measure (100 Ω-100M) to large-scale resistance value or range switches.
3, sensor of the present invention can detect multiple gas with various or smell simultaneously, by wired or wireless mode, the kind of the gas detected or smell and concentration are shown, Real-Time Monitoring can be carried out to gas in environment or smell, in addition, the mode of described signal processing module process data has learning functionality, can constantly gas or odiferous information in academic environment, more intelligent.
4, the alarm module in terminal server determines whether to report to the police according to processing signals, thus warns user.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is gas monitoring system block diagram of the present invention;
Fig. 2 is the structural representation of sensor array of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of protection of the invention.
Embodiment one:
As depicted in figs. 1 and 2, embodiments provide a kind of gas monitoring system, for identifying and Real-Time Monitoring object gas or smell, comprise sensor array, multiplexer and microprocessor, described sensor array produces the different sensor arrangement responded by four groups to gas with various and forms, often group sensor in described four groups of sensors includes four sensors, described four sensors are identical, namely can detect same gas or smell, described multiplexer selects corresponding sensor to identify object gas or smell or monitor according to the control signal that microprocessor sends.
In addition, described system also comprises the resistance measuring module for survey sensor array electric resistance, described resistance measuring module one end is connected with AD conversion unit, the other end is connected with sensor array, described microprocessor carries out range control to resistance measuring module, the signal output part of each sensor in described sensor array is electrically connected with an input end of described multiplexer respectively, described microprocessor is transmitted control signal to multiplexer by five control lines, multiplexer is selected by described control signal to export the signal corresponding sensor detecting gas or smell, when gas or smell being detected, described metering circuit measures the resistance variations of respective sensor, described microprocessor comprises the first communication module.
Described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit is used for the detection signal after amplifying to be converted to digital signal and by digital data transmission to described first communication module.
Described system also comprises terminal server, described terminal server comprises signal processing module and the second communication module, described second communication module is for receiving the digital signal of the first communication module transmission, and by described digital data transmission to signal processing module, described signal processing module is used for carrying out treatment and analysis to digital signal; By data array corresponding for described digital signal, { { x}'s described signal processing module compares for p} and setting value, when { p} is with { when x} conforms to, then judge that in current environment, gas concentration is suitable with setting value, when { p} is not with { when x} conforms to, then to data array, { p} stores, thus obtains processing signals.
Wherein, the sensor in described sensor array comprises substrate, sensitive layer and 17 electrodes, and described sensitive layer is formed at substrate surface, and described electrode is drawn by sensitive layer; Described substrate is flexible substrates, and the flexible substrates in described four groups of sensors is dimethyl silicone polymer, and the sensitive layer often organizing sensor in described four groups of sensors is respectively SnO
2, In
2o
3, mix the SnO of Cu
2and Graphene, described sensitive layer is to CO, NO
2, and H
2s has very high sensitivity, when the CO in environment is 25ppm, NO
2for 20ppm and H
2when S is 10ppm, sensor array can detect gas information in environment very delicately, gas in sensors towards ambient in sensor array detects, the detection signal composition data array { p} of all the sensors, by { { x} compares, when { p} is with { when x} conforms to, then in judgement current environment, gas concentration is suitable with setting value for p} and setting value, finally obtain the information of gaseous species and gas concentration, and by this information displaying on terminal server; When { p} is not with { when x} conforms to, then to data array, { p} stores, and the most described gas or odiferous information are presented on terminal server, when to run into same gas or smell next time, because by data array, { p} stores, then directly gas or odiferous information are presented on terminal server before.When the gas in sensor array monitoring of environmental or smell, multiplexer selects the detection signal of output transducer according to the control signal that microprocessor sends, CO, NO in one group of sensors sense environmental
2, and H
2after S gas, another three groups of sensors CO, NO successively in testing environment
2, and H
2s gas, and output test data, finally all detection data composition data array { p}.This process logic is simple, and therefore speed quickly, needs tens seconds consuming time altogether.
Described terminal server also comprises display module and alarm module, and described display module is used for the processing signals of Received signal strength processing module transmission and described processing signals is shown, thus draws kind and the concentration information of object gas or smell; Described alarm module is used for the processing signals of Received signal strength processing module transmission and determines whether to report to the police according to described processing signals.
Described terminal server is provided with the application software for this system development, carries out data transmission between described terminal server and microprocessor by wired mode.
Gas monitoring system of the present invention, has following beneficial effect:
1, the sensor array in the present invention shares circuit kit by a multiplexer, economizes on resources, reduces cost, makes sensor chip miniaturization simultaneously.
2, multiplexer of the present invention is selected to export corresponding sensor detection signal according to the control signal that microprocessor sends, and logical relation simple and fast, can detect CO, NO simultaneously
2and H
2s gas, realizes the miniaturization of device.
3, sensor of the present invention can detect three kinds of gas with various or smell simultaneously, the kind of the gas detected or smell and concentration is shown, can carry out Real-Time Monitoring to gas in environment or smell by wired mode.
4, the alarm module in terminal server determines whether to report to the police according to processing signals, thus warns user.
Embodiment two:
As depicted in figs. 1 and 2, embodiments provide a kind of gas monitoring system, for identifying and Real-Time Monitoring object gas or smell, comprise sensor array, multiplexer and microprocessor, described sensor array produces the different sensor arrangement responded by eight to gas with various and forms, and described multiplexer selects corresponding sensor to identify object gas or smell or monitor according to the control signal that microprocessor sends.
In addition, described system also comprises the resistance measuring module for survey sensor array electric resistance, described resistance measuring module one end is connected with AD conversion unit, the other end is connected with sensor array, described microprocessor carries out range control to resistance measuring module, the signal output part of each sensor in described sensor array is electrically connected with an input end of described multiplexer respectively, described microprocessor is transmitted control signal to multiplexer by three control lines, multiplexer is selected to export the signal that corresponding sensor detects gas or smell by described control signal, described microprocessor comprises the first communication module.
Described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit is used for the detection signal after amplifying to be converted to digital signal and by digital data transmission to described first communication module.
Described system also comprises terminal server, described terminal server comprises signal processing module and the second communication module, described second communication module is for receiving the digital signal of the first communication module transmission, and by described digital data transmission to signal processing module, described signal processing module is used for carrying out treatment and analysis to digital signal; By data array corresponding for described digital signal, { { x}'s described signal processing module compares for p} and setting value, when { p} is with { when x} conforms to, then judge that in current environment, gas concentration is suitable with setting value, when { p} is not with { when x} conforms to, then to data array, { p} stores, thus obtains processing signals.
Wherein, the sensor in described sensor array comprises substrate, sensitive layer and nine electrodes, and described sensitive layer is formed at substrate surface, and described electrode is drawn by sensitive layer; Described substrate is flexible substrates, and the flexible substrates in described eight sensors is polyethylene terephthalate, and the sensitive layer in described eight sensors is respectively SnO
2, WO
3, mix the SnO of Cu
2, mix the In of Zn
2o
3, Graphene, carbon nano-tube, the Graphene mixing Co and nitrogen doped carbon nanotube, described sensitive layer is to SO
2, NH
3, NO and CO
2there is very high sensitivity, as the SO in environment
2for 28ppm, NH
3for 10ppm, NO are 10ppm and CO
2during for 1000ppm, sensor array can detect gas information in environment very delicately, gas in sensors towards ambient in sensor array detects, the detection signal composition data array { p} of all the sensors, by { { x} compares, when { p} is with { when x} conforms to, then in judgement current environment, gas concentration is suitable with setting value for p} and setting value, finally obtain the information of gaseous species and gas concentration, and by this information displaying on terminal server; When { p} is not with { when x} conforms to, then to data array, { p} stores, and the most described gas or odiferous information are presented on terminal server, when to run into same gas or smell next time, because by data array, { p} stores, then directly gas or odiferous information are presented on terminal server before.When the gas in sensor array monitoring of environmental or smell, multiplexer selects the detection signal of output transducer according to the control signal that microprocessor sends, the SO in a sensors sense environmental
2, NH
3, NO and CO
2after gas, the SO of another seven sensors successively in testing environment
2, NH
3, NO and CO
2gas, and output test data, finally all detection data composition data array { p}.This process logic is simple, and therefore speed quickly, needs tens seconds consuming time altogether.
Described terminal server also comprises display module and alarm module, and described display module is used for the processing signals of Received signal strength processing module transmission and described processing signals is shown, thus draws kind and the concentration information of object gas or smell; Described alarm module is used for the processing signals of Received signal strength processing module transmission and determines whether to report to the police according to described processing signals.
Described terminal server is provided with the application software for this system development, carries out data transmission between described terminal server and microprocessor by the wireless mode of bluetooth.
Gas monitoring system of the present invention, has following beneficial effect:
1, the sensor array in the present invention shares circuit kit by a multiplexer, economizes on resources, reduces cost, makes sensor chip miniaturization simultaneously.
2, multiplexer of the present invention is selected to export corresponding sensor detection signal according to the control signal that microprocessor sends, and logical relation simple and fast, can detect multiple gases or smell simultaneously, realize the miniaturization of device.
3, sensor of the present invention can detect four kinds of gas with various or smell simultaneously, the kind of the gas detected or smell and concentration is shown, can carry out Real-Time Monitoring to gas in environment or smell by bluetooth approach.
4, the alarm module in terminal server determines whether to report to the police according to processing signals, thus warns user.
Embodiment three:
As depicted in figs. 1 and 2, embodiments provide a kind of gas monitoring system, for identifying and Real-Time Monitoring object gas or smell, comprise sensor array, multiplexer and microprocessor, described sensor array produces the different sensor arrangement responded by 16 to gas with various and forms, and described multiplexer selects corresponding sensor to identify object gas or smell or monitor according to the control signal that microprocessor sends.
In addition, described system also comprises the resistance measuring module for survey sensor array electric resistance, described resistance measuring module one end is connected with AD conversion unit, the other end is connected with sensor array, described microprocessor carries out range control to resistance measuring module, the signal output part of each sensor in described sensor array is electrically connected with an input end of described multiplexer respectively, described microprocessor is transmitted control signal to multiplexer by four control lines, multiplexer is selected to export the signal that corresponding sensor detects gas or smell by described control signal, described microprocessor comprises the first communication module.
Described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit is used for the detection signal after amplifying to be converted to digital signal and by digital data transmission to described first communication module.
Described system also comprises terminal server, described terminal server comprises signal processing module and the second communication module, described second communication module is for receiving the digital signal of the first communication module transmission, and by described digital data transmission to signal processing module, described signal processing module is used for carrying out treatment and analysis to digital signal; By data array corresponding for described digital signal, { { x}'s described signal processing module compares for p} and setting value, when { p} is with { when x} conforms to, then judge that in current environment, gas concentration is suitable with setting value, when { p} is not with { when x} conforms to, then to data array, { p} stores, thus obtains processing signals.
Wherein, the sensor in described sensor array comprises silicon base, sensitive layer and 17 electrodes, and described sensitive layer is formed at substrate surface, and described electrode is drawn by sensitive layer; Sensitive layer in described 16 sensors is respectively SnO
2, In
2o
3, ZnO, mix the SnO of Cu
2, mix the In of Zn
2o
3, mix the ZnO of Fe, mix the SnO of Ni
2, mix the In of Co
2o
3, mix the ZnO of Cu, the ZnO mixing Co, Graphene, carbon nano-tube, the Graphene mixing Co, the Graphene mixing Fe, Co, nitrogen doped carbon nanotube and boron-doping carbon nano-tube, described sensitive layer is to CO, H
2s, methane and CO
2there is very high sensitivity, when the CO in environment is 25ppm, H
2s is 10ppm, methane 100ppm and CO
2during 1000ppm, sensor array can detect gas information in environment very delicately, gas in sensors towards ambient in sensor array detects, the detection signal composition data array { p} of all the sensors, by { { x} compares, when { p} is with { when x} conforms to, then in judgement current environment, gas concentration is suitable with setting value for p} and setting value, finally obtain the information of gaseous species and gas concentration, and by this information displaying on terminal server; When { p} is not with { when x} conforms to, then to data array, { p} stores, and the most described gas or odiferous information are presented on terminal server, when to run into same gas or smell next time, because by data array, { p} stores, then directly gas or odiferous information are presented on terminal server before.When the gas in sensor array monitoring of environmental or smell, multiplexer selects the detection signal of output transducer according to the control signal that microprocessor sends, CO, H in a sensors sense environmental
2s, methane and CO
2after gas, another 15 sensors CO, H successively in testing environment
2s, methane and CO
2gas, and output test data, finally all detection data composition data array { p}.This process logic is simple, and therefore speed quickly, needs 5 ~ 10 seconds consuming time altogether.
Described terminal server also comprises display module and alarm module, and described display module is used for the processing signals of Received signal strength processing module transmission and described processing signals is shown, thus draws kind and the concentration information of object gas or smell; Described alarm module is used for the processing signals of Received signal strength processing module transmission and determines whether to report to the police according to described processing signals.
Described terminal server is provided with the application software for this system development, carries out data transmission between described terminal server and microprocessor by the wireless mode of GPRS.
Gas monitoring system of the present invention, has following beneficial effect:
1, the sensor array in the present invention shares circuit kit by a multiplexer, economizes on resources, reduces cost, makes sensor chip miniaturization simultaneously.
2, multiplexer of the present invention is selected to export corresponding sensor detection signal according to the control signal that microprocessor sends, and logical relation simple and fast, can detect multiple gases or smell simultaneously, realize the miniaturization of device.3, sensor of the present invention can detect four kinds of gas with various or smell simultaneously, the kind of the gas detected or smell and concentration is shown, can carry out Real-Time Monitoring to gas in environment or smell by bluetooth approach.
4, the alarm module in terminal server determines whether to report to the police according to processing signals, thus warns user.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a gas monitoring system, it is characterized in that, for identifying and Real-Time Monitoring object gas or smell, comprise sensor array, multiplexer and microprocessor, described sensor array produces the different sensor arrangement responded by m to gas with various and forms, and described multiplexer selects corresponding sensor to identify object gas or smell or monitor according to the control signal that microprocessor sends.
2. gas monitoring system according to claim 1, it is characterized in that, described system also comprises signal amplification unit and AD conversion unit, described signal amplification unit be used for by Sensor monitoring to gas or the detection signal of smell carry out amplifying and the detection signal after amplifying be transferred to AD conversion unit, described AD conversion unit be used for by amplify after detection signal be converted to digital signal and by digital data transmission give described first communication module, described AD conversion unit is controlled by microprocessor.
3. gas monitoring system according to claim 2, it is characterized in that, described system also comprises the resistance measuring module for survey sensor array electric resistance, described resistance measuring module one end is connected with AD conversion unit, the other end is connected with sensor array, and the range of described resistance measuring module is controlled by microprocessor.
4. the gas monitoring system according to claim 1-3 any one, it is characterized in that, the signal output part of each sensor in described sensor array is electrically connected with an input end of described multiplexer respectively, described microprocessor is transmitted control signal to multiplexer by n root control line, multiplexer is selected to export the signal that corresponding sensor detects gas or smell, quantity m≤2 of described sensor by described control signal
n-1.
5. gas monitoring system according to claim 4, is characterized in that, described microprocessor comprises the first communication module.
6. the gas monitoring system according to claim 1,2,3 or 5 any one, it is characterized in that, described system also comprises terminal server, described terminal server comprises signal processing module and the second communication module, described second communication module is for receiving the digital signal of the first communication module transmission, and by described digital data transmission to signal processing module, described signal processing module is used for carrying out treatment and analysis to digital signal.
7. gas monitoring system according to claim 6, it is characterized in that, by data array corresponding for described digital signal, { { x}'s described signal processing module compares for p} and setting value, when { p} is with { when x} conforms to, then judge that in current environment, gas concentration is suitable with setting value, when { p} is with { when x} does not conform to, then to data array, { p} stores, thus obtains processing signals.
8. gas monitoring system according to claim 7, it is characterized in that, described terminal server also comprises display module, described display module is used for the processing signals of Received signal strength processing module transmission and described processing signals is shown, thus draws kind and the concentration information of object gas or smell.
9. gas monitoring system according to claim 8, is characterized in that, described terminal server also comprises alarm module, and described alarm module is used for the processing signals of Received signal strength processing module transmission and determines whether to report to the police according to described processing signals.
10. the gas monitoring system according to claim 7-9 any one, it is characterized in that, described terminal server is provided with the application software for this system development, carries out data transmission between described terminal server and microprocessor by wired or wireless mode.
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Application publication date: 20150513 Assignee: Jiangsu Zhiwen Intelligent Sensing Technology Co., Ltd. Assignor: SUZHOU HUIWEN NANO TECHNOLOGY CO., LTD. Contract record no.: 2018320010057 Denomination of invention: Gas monitoring system Granted publication date: 20180619 License type: Common License Record date: 20181116 |