CN104199117A - Infrared ultraviolet composite flame detector and detection method thereof - Google Patents
Infrared ultraviolet composite flame detector and detection method thereof Download PDFInfo
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- CN104199117A CN104199117A CN201410411771.XA CN201410411771A CN104199117A CN 104199117 A CN104199117 A CN 104199117A CN 201410411771 A CN201410411771 A CN 201410411771A CN 104199117 A CN104199117 A CN 104199117A
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Abstract
The invention provides an infrared ultraviolet composite flame detector. A log amplifier is utilized to convert current from an ultraviolet photoelectric tube and an infrared photoelectric detector to enable the flame detector to detect tiny signals. A detection method of the flame detector can be further provided, and the tiny signals can be detected by utilizing the method to conduct flame detection.
Description
Technical field
The present invention relates to fire-fighting domain, particularly a kind of infrared and ultraviolet composite flame detecting device and detection method thereof.
Background technology
Existing flame detector is roughly divided into two kinds, and a kind of is outside Shan Hong or single ultraviolet flame detector, and another kind is infrared and ultraviolet combined type flame detector.These two kinds of flame detectors all have some limitations: outside Shan Hong or the antijamming capability of single ultraviolet flame detector poor, be easier to be subject to the impact of the bias lights such as sunshine, thermal source, fluorescent light, incandescent lamp and produce false alarm.Therefore, this class flame detector is only applicable to the limited enclosure space of available light.The infrared combined type flame of traditional ultraviolet detector is limited to the use-pattern of ultraviolet phototube, and the response time is longer.Therefore, this class flame detector cannot meet the quick response requirement to flame.In addition existing flame detector, in signal processing, adopts Linear magnifying technology in high more, cannot detect tiny signal, and dynamic range is less simultaneously, causes flame detector sensitivity low, and detection range is limited.
Summary of the invention
The present invention is intended at least solve one of technical matters existing in prior art.For this reason, the present invention proposes a kind of infrared and ultraviolet composite flame detecting device, by logarithmic amplifier, to changing from the electric current of ultraviolet phototube and infrared photoelectric detector, makes this flame detector can detect small signal.The present invention also provides the detection method of above-mentioned flame detector, uses the method to carry out flame detecting, can detect tiny signal.
In order to realize above-mentioned technique effect, concrete technical scheme is:
An infrared and ultraviolet composite flame detecting device, comprising: ultraviolet sensor circuit, and described ultraviolet sensor circuit comprises ultraviolet phototube, the first logarithmic amplifier, the first analog to digital converter being electrically connected to successively; Infrared induction circuit, described infrared induction circuit comprises infrared photoelectric detector, the second logarithmic amplifier, the second analog to digital converter being electrically connected to successively; And data processing chip, described infrared induction circuit, ultraviolet sensor circuit are connected with described data processing chip respectively.
As such scheme preferably, the operating voltage of described ultraviolet phototube is periodic square wave voltage.
As such scheme preferably, the dynamic range of described the first logarithmic amplifier and the second logarithmic amplifier is 160dB, minimum input current is 100pA, the sensitivity of described infrared photoelectric detector is 1A/W.
As such scheme preferably, described data processing chip is FPGA.
The present invention also provides a kind of detection method of infrared and ultraviolet composite flame detecting device, comprise the steps: to form current impulse after ultraviolet phototube senses ultraviolet light, described current impulse becomes the first voltage signal through the first logarithmic amplifier aftertreatment, and described the first voltage signal forms the first digital signal through the first analog to digital converter; Infrared photoelectric detector forms direct current signal after sensing infrared light, and described direct current signal becomes second voltage signal through the second logarithmic amplifier aftertreatment, and described second voltage signal forms the second digital signal through the second analog to digital converter; Described the first digital signal, the second digital signal process to differentiate whether send fire alarm signal through data processing chip.
As such scheme preferably, described data processing chip is processed the step of differentiating and is specially: whether have the first digital signal and the second digital signal simultaneously, if not, do not send fire alarm signal, if, further judgement: whether the second digital signal is less than 1500cnt, if, judge whether the first digital signal is formed by the current impulse that is greater than five, if the first digital signal is formed by the current impulse that is less than five, do not send fire alarm signal, otherwise, fire alarm signal sent; If the second digital signal is not less than 1500cnt, judge whether the first digital signal is formed by the current impulse that is not less than two, if the first digital signal is formed by the current impulse that is less than two, do not send fire alarm signal, otherwise, send fire alarm signal.
As such scheme preferably, described ultraviolet phototube senses that the concrete mode that forms current impulse after ultraviolet light is: the operating voltage using periodic square wave voltage as described ultraviolet phototube two interpolars, by the pulsewidth of controlling party wave voltage, make can produce a current impulse in each voltage cycle.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of infrared and ultraviolet composite flame detecting device provided by the invention;
Fig. 2 is the square wave schematic diagram that is applied to the operating voltage at ultraviolet phototube the two poles of the earth;
Fig. 3 is the process flow diagram of the fire determination step of data processing chip.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, orientation or the position relationship of the indications such as term " " center ", " on ", D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward " be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; rather than the device of indication or hint indication or element must have specific orientation, with specific orientation structure and operation, so can not be interpreted as limitation of the present invention.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
As depicted in figs. 1 and 2, the invention provides a kind of infrared and ultraviolet composite flame detecting device, comprising:
Ultraviolet sensor circuit, described ultraviolet sensor circuit comprises the ultraviolet phototube being electrically connected to successively, the first logarithmic amplifier, the first analog to digital converter, as shown in Figure 2, the operating voltage of described ultraviolet phototube is periodic square wave voltage, the model of the ultraviolet phototube adopting in the present embodiment is R9533, response wave length scope is that 185nm is to 260nm, supply voltage is 400V, the model of the first logarithmic amplifier adopting is AD8304, dynamic range is 160dB, investigative range is that 100pA is to 10mA, operating voltage is 3V, output bandwidth is 10MHz, the model of the first analog to digital converter adopting is THS1206, the analog to digital converter of this model belongs to 12, 6MSPS, the digital to analog converter of real time sample, described side is 5ms wave period, pulsewidth is 60 μ s,
Infrared induction circuit, described infrared induction circuit comprises infrared photoelectric detector, the second logarithmic amplifier, the second analog to digital converter being electrically connected to successively, the model of the infrared photoelectric detector adopting in the present embodiment is FGA21, response wave length is that 800nm is to 1800nm, maximum bias voltage is 3V, typical case's dark current value is 50nA, and the output signal rise/fall time is 66ns, and sensitivity is 1A/W.The model of the second logarithmic amplifier adopting is that AD8304, dynamic range are that 160dB, investigative range are that 100pA is that 3V, output bandwidth are 10MHz to 10mA, operating voltage, the model of the second analog to digital converter adopting is THS1206, and the analog to digital converter of this model belongs to 12, the digital to analog converter of 6MSPS, real time sample; And
Data processing chip, described infrared induction circuit, ultraviolet sensor circuit are connected with described data processing chip respectively, and described data processing chip is that model is the FPGA of Cyclone II.
Dynamic range and the minimum input current of logarithmic amplifier depended in the sensitivity of a kind of infrared and ultraviolet composite flame detecting device provided by the invention.The second logarithmic amplifier that flame detector described in the invention uses all has the dynamic range of 160dB, minimum input current is 100pA, and the sensitivity of infrared photoelectric detector is 1A/W.When the second logarithmic amplifier and infrared photoelectric detector are used in conjunction with, it is only the faint infrared signal of 100pW that flame detector provided by the present invention can detect power.When ultraviolet phototube produces pulse, the peak point current of this pulse can reach 30mA, and average discharge current can reach 1mA, and this current value is positioned at the working range of the first used logarithmic amplifier.Therefore flame detector provided by the present invention has high sensitivity, can survey faint flame or distant flame.
The induction speed of a kind of infrared and ultraviolet composite flame detecting device provided by the invention is embodied in soon: ultraviolet phototube forms current impulse after sensing ultraviolet light, during fire judgement, need to count this current impulse, from the angle of reliability, need at least two photocurrent pulses to judge the existence of flame.The present invention uses the periodic square wave voltage shown in Fig. 2 as the operating voltage of ultraviolet phototube, by side be decided to be 5ms wave period, pulsewidth is decided to be 60 μ s, make can produce a current impulse in each voltage cycle.Therefore, the response time of flame detector is exactly the integral multiple in voltage signal cycle, and now the cycle of voltage signal be a millisecond magnitude, therefore this flame detector be a millisecond magnitude to the response time of ultraviolet light.Infrared photoelectric detector forms direct current signal, and this flame detector was tens nanoseconds to the response time of infrared light.Because the standard that judges fire is for sense infrared light and ultraviolet light simultaneously, therefore, the response time of flame detector provided by the present invention is the time that ultraviolet phototube produces the pulse needs of determining number, is a millisecond magnitude.
The present invention also provides a kind of detection method of infrared and ultraviolet composite flame detecting device, comprises the steps:
(1) ultraviolet phototube forms current impulse after sensing ultraviolet light, described ultraviolet phototube senses that the concrete mode that forms current impulse after ultraviolet light is: the operating voltage using periodic square wave voltage as described ultraviolet phototube two interpolars, by the pulsewidth of controlling party wave voltage, make can produce a current impulse in each voltage cycle, described current impulse becomes the first voltage signal through the first logarithmic amplifier aftertreatment, and described the first voltage signal forms the first digital signal through the first analog to digital converter; Infrared photoelectric detector forms direct current signal after sensing infrared light, and described direct current signal becomes second voltage signal through the second logarithmic amplifier aftertreatment, and described second voltage signal forms the second digital signal through the second analog to digital converter;
(2) described the first digital signal, the second digital signal processes to differentiate whether send fire alarm signal through data processing chip, as shown in Figure 3, described data processing chip is processed the step of differentiating and is specially: whether have the first digital signal and the second digital signal simultaneously, if not, do not send fire alarm signal, if, further judgement: whether the second digital signal is less than 1500cnt, if, judge whether the first digital signal is formed by the current impulse that is greater than five, if the first digital signal is formed by the current impulse that is less than five, do not send fire alarm signal, otherwise, send fire alarm signal, if the second digital signal is not less than 1500cnt, judge whether the first digital signal is formed by the current impulse that is not less than two, if the first digital signal is formed by the current impulse that is less than two, do not send fire alarm signal, otherwise, send fire alarm signal.
The method is applicable to above-mentioned flame detector, and the method can improve the antijamming capability of above-mentioned flame detector, is embodied in: first, only have and while infrared light and ultraviolet light being detected, just likely carry out fire alarm simultaneously; Secondly, alert if is carried out to refinement, judge whether the second digital signal is less than 1500cnt, judge that infrared ray is strong and weak, when being less than 1500cnt, the second digital signal thinks when infrared ray is weak, ultraviolet phototube formation current impulse over five detected and just send fire alarm, when this setting means can prevent that infrared ray is weak, the interference that this two classes interference source of the spontaneous radiation of ultraviolet phototube and cosmic rays causes; While thinking that infrared ray is stronger when the second digital signal is not less than 1500cnt, ultraviolet phototube formation current impulse over two detected and send fire alarm, this setting means has guaranteed the quick response of above-mentioned flame detector.Therefore, when above-mentioned flame detector adopts this detection method to survey, both improve the antijamming capability of flame detector, and can guarantee again its advantage of response fast.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (7)
1. an infrared and ultraviolet composite flame detecting device, is characterized in that, comprising:
Ultraviolet sensor circuit, described ultraviolet sensor circuit comprises ultraviolet phototube, the first logarithmic amplifier, the first analog to digital converter being electrically connected to successively;
Infrared induction circuit, described infrared induction circuit comprises infrared photoelectric detector, the second logarithmic amplifier, the second analog to digital converter being electrically connected to successively; And
Data processing chip, described infrared induction circuit, ultraviolet sensor circuit are connected with described data processing chip respectively.
2. infrared and ultraviolet composite flame detecting device according to claim 1, is characterized in that, the operating voltage of described ultraviolet phototube is periodic square wave voltage.
3. infrared and ultraviolet composite flame detecting device according to claim 1 and 2, it is characterized in that, the dynamic range of described the first logarithmic amplifier and the second logarithmic amplifier is 160dB, and minimum input current is 100pA, and the sensitivity of described infrared photoelectric detector is 1A/W.
4. infrared and ultraviolet composite flame detecting device according to claim 1 and 2, is characterized in that, described data processing chip is FPGA.
5. a detection method for infrared and ultraviolet composite flame detecting device, is characterized in that, comprises the steps:
Ultraviolet phototube forms current impulse after sensing ultraviolet light, and described current impulse becomes the first voltage signal through the first logarithmic amplifier aftertreatment, and described the first voltage signal forms the first digital signal through the first analog to digital converter;
Infrared photoelectric detector forms direct current signal after sensing infrared light, and described direct current signal becomes second voltage signal through the second logarithmic amplifier aftertreatment, and described second voltage signal forms the second digital signal through the second analog to digital converter;
Described the first digital signal, the second digital signal process to differentiate whether send fire alarm signal through data processing chip.
6. the detection method of infrared and ultraviolet composite flame detecting device according to claim 5, it is characterized in that, described data processing chip is processed the step of differentiating and is specially: whether have the first digital signal and the second digital signal simultaneously, if not, do not send fire alarm signal, if, further judgement: whether the second digital signal is less than 1500cnt, if, judge whether the first digital signal is formed by the current impulse that is greater than five, if the first digital signal is formed by the current impulse that is less than five, do not send fire alarm signal, otherwise, send fire alarm signal, if the second digital signal is not less than 1500cnt, judge whether the first digital signal is formed by the current impulse that is not less than two, if the first digital signal is formed by the current impulse that is less than two, do not send fire alarm signal, otherwise, send fire alarm signal.
7. according to the detection method of the infrared and ultraviolet composite flame detecting device described in claim 5 or 6, it is characterized in that, described ultraviolet phototube senses that the concrete mode that forms current impulse after ultraviolet light is: the operating voltage using periodic square wave voltage as described ultraviolet phototube two interpolars, by the pulsewidth of controlling party wave voltage, make can produce a current impulse in each voltage cycle.
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Cited By (10)
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| CN106128008A (en) * | 2016-06-30 | 2016-11-16 | 王永福 | A kind of Spark plug optical fiber sensor system |
| CN106949976A (en) * | 2016-12-19 | 2017-07-14 | 中蕊（武汉）光电科技有限公司 | One kind two is infrared（IR）Two is ultraviolet（UV）Purple complex probe technology realize the devices and methods therefor of flame detecting |
| CN107170173A (en) * | 2017-05-27 | 2017-09-15 | 重庆英卡电子有限公司 | Infrared and ultraviolet flame detector control system and its control method |
| CN107478581A (en) * | 2017-06-29 | 2017-12-15 | 成都旭光光电技术有限责任公司 | A kind of ultraviolet light detection method, module and system |
| CN111288484A (en) * | 2018-12-06 | 2020-06-16 | 西门子股份公司 | Flame monitor |
| CN111986436A (en) * | 2020-09-02 | 2020-11-24 | 成都指码科技有限公司 | Comprehensive flame detection method based on ultraviolet and deep neural networks |
| CN113570810A (en) * | 2021-07-16 | 2021-10-29 | 无锡格林通安全装备有限公司 | Hydrogen flame detection method and device |
| CN113916381A (en) * | 2021-10-11 | 2022-01-11 | 无锡格林通安全装备有限公司 | Flame detection method and device based on FFT, BP and rectangular filter bank |
| CN114140975A (en) * | 2021-12-01 | 2022-03-04 | 张建宏 | Deflagration detector |
| CN114743339A (en) * | 2022-04-18 | 2022-07-12 | 广东电网有限责任公司 | Power distribution branch box fire-fighting early warning system, method and device based on Beidou positioning |
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| CN111437556A (en) * | 2020-04-15 | 2020-07-24 | 上海翼捷工业安全设备股份有限公司 | Fire detector, fire detection method and automatic fire extinguishing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106128008B (en) * | 2016-06-30 | 2018-08-17 | 王永福 | A kind of Spark plug optical fiber sensor system |
| CN106128008A (en) * | 2016-06-30 | 2016-11-16 | 王永福 | A kind of Spark plug optical fiber sensor system |
| CN106949976A (en) * | 2016-12-19 | 2017-07-14 | 中蕊（武汉）光电科技有限公司 | One kind two is infrared（IR）Two is ultraviolet（UV）Purple complex probe technology realize the devices and methods therefor of flame detecting |
| CN107170173A (en) * | 2017-05-27 | 2017-09-15 | 重庆英卡电子有限公司 | Infrared and ultraviolet flame detector control system and its control method |
| CN107478581B (en) * | 2017-06-29 | 2023-03-14 | 成都紫外光电技术有限公司 | Ultraviolet light detection method, module and system |
| CN107478581A (en) * | 2017-06-29 | 2017-12-15 | 成都旭光光电技术有限责任公司 | A kind of ultraviolet light detection method, module and system |
| CN111288484A (en) * | 2018-12-06 | 2020-06-16 | 西门子股份公司 | Flame monitor |
| US11105509B2 (en) | 2018-12-06 | 2021-08-31 | Siemens Aktiengesellschaft | Flame monitor |
| CN111986436A (en) * | 2020-09-02 | 2020-11-24 | 成都指码科技有限公司 | Comprehensive flame detection method based on ultraviolet and deep neural networks |
| CN111986436B (en) * | 2020-09-02 | 2022-12-13 | 成都视道信息技术有限公司 | Comprehensive flame detection method based on ultraviolet and deep neural networks |
| CN113570810A (en) * | 2021-07-16 | 2021-10-29 | 无锡格林通安全装备有限公司 | Hydrogen flame detection method and device |
| CN113916381A (en) * | 2021-10-11 | 2022-01-11 | 无锡格林通安全装备有限公司 | Flame detection method and device based on FFT, BP and rectangular filter bank |
| CN114140975A (en) * | 2021-12-01 | 2022-03-04 | 张建宏 | Deflagration detector |
| CN114743339A (en) * | 2022-04-18 | 2022-07-12 | 广东电网有限责任公司 | Power distribution branch box fire-fighting early warning system, method and device based on Beidou positioning |
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