CN212694546U - Single-ultraviolet double-infrared flame detector - Google Patents
Single-ultraviolet double-infrared flame detector Download PDFInfo
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- CN212694546U CN212694546U CN202021251612.5U CN202021251612U CN212694546U CN 212694546 U CN212694546 U CN 212694546U CN 202021251612 U CN202021251612 U CN 202021251612U CN 212694546 U CN212694546 U CN 212694546U
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Abstract
The utility model discloses a two infrared flame detectors of single ultraviolet, 0.2um ultraviolet photosensitive tube passes through the ultraviolet signal amplitude limit and ultraviolet signal shaping circuit is connected with 16 MCU treater, high SNR FbS surveys first and high SNR FbSe and surveys first and be connected with 16 MCU treater through infrared signal preamplifier circuit and infrared signal filtering amplifier circuit respectively, 16 MCU treater is surveyed first and high SNR FbSe and is connected through infrared calibration circuit simultaneously and high SNR FbS. The utility model discloses in, through the detection to 0.2um, 2.7um and 4.4um wave band radiation peak value, combine flame detection intelligent algorithm, realized the accurate reliable judgement to flame, realize conflagration automatic detection and automatic alarm, and possess intellectuality, information-based function, solved the poor inherent defect of single ordinary fire detection method interference killing feature simultaneously, stopped to lead to the emergence of fire extinguishing systems mistake spray bottle malfunction event because of detector wrong report police, be worth wideling popularize.
Description
Technical Field
The utility model relates to a fire-fighting equipment field especially relates to a flame detector of two infrared of single ultraviolet.
Background
The optical flame detector is used as a detection core component of an automatic fire extinguishing system, has high reliability and quick response time, is widely applied to the fields of fuel oil depots, explosive production lines and the like, and through decades of development, various types including single ultraviolet, multiple ultraviolet, single infrared, multiple infrared, ultraviolet infrared, single ultraviolet multiple infrared and the like are developed at present, and are widely applied to different fields respectively.
The optical flame detectors with high detection precision and long detection distance are easy to generate false alarm and low in reliability, and the optical flame detectors with high detection reliability are difficult to detect long-distance fire or short-distance weak flame, are low in detection precision, can reduce the working efficiency of an automatic fire extinguishing and explosion preventing system, influence the production and storage of equipment installation places, and cause irrecoverable consequences more seriously to cause great economic and life and property losses.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a flame detector with single ultraviolet and double infrared.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a single two infrared flame detector of ultraviolet, surveys first and temperature acquisition circuit including power source, high SNR FbS, power source passes through power conversion circuit and the adjustable operating voltage boost circuit of ultraviolet and is connected with 0.2um ultraviolet photosensitive tube, 0.2um ultraviolet photosensitive tube passes through the ultraviolet signal range limit and ultraviolet signal shaping circuit is connected with 16 position MCU treater, high SNR FbS surveys first and high SNR FbSe surveys first and is connected with 16 position MCU treater through infrared signal preamplifier circuit and infrared signal filtering amplifier circuit respectively, 16 position MCU treater passes through infrared calibration circuit and is connected with high SNR FbS detection first and high SNR FbSe detection unit simultaneously, temperature acquisition circuit is connected with 16 position MCU treater alone and 16 position MCU treater are connected with output interface circuit simultaneously, be provided with in the 16 position MCU treater with the corresponding AD conversion circuit of infrared signal filtering amplifier circuit and with ultraviolet signal shaping circuit Corresponding pulse counting circuit, 0.2um ultraviolet photosensitive tube in the detector, high SNR FbS detect the first and high SNR FbSe and detect first front end and be provided with the quartz window and high SNR FbS detect the first and high SNR FbSe and detect between first and the quartz window and be provided with the light filter.
As a further description of the above technical solution:
the 0.2um ultraviolet photosensitive tube is the photoelectric conversion device based on the ultraviolet photoelectric effect, the signal of 0.2um ultraviolet photosensitive tube output is high-voltage pulse signal.
As a further description of the above technical solution:
the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are infrared photosensitive tubes, and signals output by the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are weak millivolt-level signals.
As a further description of the above technical solution:
the optical filter between high SNR FbS detection element and the quartz window is 2.7 um's high transmissivity narrowband optical filter, the optical filter between high SNR FbSe detection element and the quartz window is 4.4 um's high transmissivity narrowband optical filter.
As a further description of the above technical solution:
a miniature incandescent calibration indicator lamp is arranged in the infrared calibration circuit, and a temperature sensing chip is arranged in the temperature acquisition circuit.
As a further description of the above technical solution:
the output interface circuit is a 4-20 mA current loop signal output interface circuit.
As a further description of the above technical solution:
the 16-bit MCU processor, the crystal oscillator, the program downloading debugging interface and the processor peripheral resistance-capacitance circuit form a core control unit processing circuit.
The utility model discloses following beneficial effect has:
1. the utility model discloses in, through the detection to 0.2um, 2.7um and 4.4um wave band radiation peak value, combine flame detection intelligent algorithm, realized the accurate reliable judgement to flame, further improvement the sensitivity and the reliability of detector.
2. The utility model discloses in, can realize conflagration automatic detection and automatic alarm through flame detector to possess intellectuality, information-based function, can long-rangely monitor the conflagration, replaced traditional artifical tour, improved work efficiency, stopped the conflagration and leaked the warning potential safety hazard.
3. The utility model discloses in, the flame detector can replace detection mode's such as single ultraviolet, many ultraviolet, single infrared, many infrared, purple infrared, single ultraviolet many infrared detectors, has solved the poor inherent defect of single ordinary fire detection method interference killing feature, has stopped to lead to the emergence of fire extinguishing systems mistake spray bottle malfunction event because of detector wrong report police, has reduced fire extinguishing systems maintenance cost, has reduced the loss, is worth wideling popularize.
Drawings
Fig. 1 is a schematic block diagram of a single ultraviolet and dual infrared flame detector provided by the present invention;
FIG. 2 is a chart showing a hydrocarbon compound diffusion type flame combustion radiation spectrum;
fig. 3 is an ultraviolet adjustable operating voltage boost circuit of a single ultraviolet dual infrared flame detector provided by the present invention;
fig. 4 is an ultraviolet signal amplitude limiting and shaping circuit of the flame detector with single ultraviolet and double infrared provided by the utility model;
fig. 5 is an infrared preamplifier circuit of a single ultraviolet double infrared flame detector provided by the utility model;
fig. 6 is an infrared filter amplifier circuit of a single ultraviolet and dual infrared flame detector provided by the present invention;
fig. 7 is a processing circuit of a core control unit of the flame detector with single ultraviolet and double infrared provided by the utility model;
FIG. 8 is a circuit diagram of a 4-20 mA current loop signal output interface of the single ultraviolet double infrared flame detector of the present invention;
fig. 9 is a flowchart illustrating the operation of the single ultraviolet and dual infrared flame detector of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-9, the present invention provides an embodiment: a flame detector with single ultraviolet and double infrared comprises a power interface, a high signal-to-noise ratio FbS detecting element and a temperature acquisition circuit, wherein the main components of combustible substances and gas are hydrocarbons and have a C-H bond structure, and the flame detector can be known by spectral analysis of combustion flame of hydrocarbon substances, when the flame detector is combusted, the flame detector has three peak values of 0.2um waveband for an external radiation waveband, namely an ultraviolet radiation peak value, 2.7um waveband for H2O radiation peak value and 4.4um waveband for CO2 radiation peak value, so that flame radiation can be reliably detected and accurately identified, the three peak value wavebands are selected as the detection wavebands of flame, and whether the flame detector is a real 'fire' signal can be accurately and reliably judged by sampling and algorithm identification of three detection signals, so that the sensitivity and reliability of the flame detector are improved, the power interface is connected with a 0.2um ultraviolet photosensitive tube through a power conversion circuit and an ultraviolet adjustable working voltage boosting circuit, the 0.2um ultraviolet photosensitive tube is connected with the 16-bit MCU processor through an ultraviolet signal amplitude limiting and ultraviolet signal shaping circuit, if a high pulse signal output by the 0.2um ultraviolet photosensitive tube is directly connected with the 16-bit MCU processor, the processor is damaged, so that amplitude limiting processing is required, the signal after the amplitude limiting processing is a sawtooth pulse signal, in order to ensure that the processor can reliably identify the signal, shaping processing is required to be carried out on the sawtooth signal obtained after the amplitude limiting processing, the amplitude limiting measure is mainly realized through the clamping action of V3, the shaping circuit is realized through a Schmidt trigger, the trigger adopts 74HCT2G14GW, the ultraviolet signal after the shaping processing is a standard square wave signal and is sent to the processor for fire analysis and judgment, the 16-bit MCU processor can accurately identify the standard signal, the processor is MC9S12C128CFA, the processor has powerful functions, rich interfaces and high operation speed, the intelligent algorithm for detecting the flame of the detector provides guarantee for the rapidity and the accuracy of fire judgment and analysis, the judgment of the flame is completed by analyzing and processing the number of collected ultraviolet pulses and the voltage values of two paths of infrared signals and combining the environment temperature and the calibration coefficient of the detector, a high signal-to-noise ratio FbS detecting element and a high signal-to-noise ratio FbSe detecting element are respectively connected with a 16-bit MCU processor through an infrared signal preamplifier circuit and an infrared signal filter amplifier circuit, the infrared signal filter amplifier circuit adopts an amplifier circuit to carry out follow amplification processing on the infrared signals, an operational amplifier adopts MCP606, B1 is a narrow-band infrared photosensitive tube with a high signal-to-noise ratio, R17 is a sampling resistor, weak infrared signals detected by B1 are subjected to follow amplification processing after being sampled by R17 and then are sent to filter amplification, the infrared signal preamplifier circuit adopts an amplifier circuit to carry out filter amplification processing on the infrared signals, the operational amplifier adopts MCP607, a 16-bit MCU processor is simultaneously connected with a high signal-to-noise ratio FbS detecting element and a high signal-to-noise ratio FbSe detecting element through an infrared calibration circuit, a temperature acquisition circuit is separately connected with the 16-bit MCU processor and the 16-bit MCU processor is simultaneously connected with an output interface circuit, an A/D conversion circuit corresponding to an infrared signal filtering and amplifying circuit and a pulse counting circuit corresponding to an ultraviolet signal shaping circuit are arranged in the 16-bit MCU processor, a quartz window is arranged at the front ends of a 0.2um ultraviolet photosensitive tube, a high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element in the detector, and optical filters are arranged between the high signal-to-noise ratio FbS detecting element and the high signal-to-noise.
The 0.2um ultraviolet photosensitive tube is a photoelectric conversion device based on the ultraviolet photoelectric effect, the signal output by the 0.2um ultraviolet photosensitive tube is a high-voltage pulse signal, the 0.2um ultraviolet photosensitive tube is required to work in a high-voltage state for realizing higher sensitivity, an external power supply can be converted into high voltage through an ultraviolet adjustable working voltage booster circuit, the high voltage is output to provide excitation power for a 0.2um ultraviolet photosensitive tube, the input power enters a power control chip U1 and a coil T1 after three-stage protection, the power control chip U1 adopts SG3524, the U1 controls the conduction state of the coil T1 through a transistor Q1 and a transistor Q2, thereby controlling the output voltage Vuv, the voltage of the Vuv is divided by R1 and RP1 to form negative feedback, thereby achieving stable output, realizing the adjustment of the output voltage Vuv within the range of 50-500V by adjusting RP1, having individual difference in ultraviolet photoelectric tubes, through adjustment, the voltage adjusting function can realize the adjustment of the sensitivity consistency of ultraviolet phototubes of the same type.
The high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are infrared photosensitive tubes, and the signals output by the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are weak millivolt-level signals which are difficult to be identified and distinguished by a 16-bit MCU processor, therefore, infrared signals need to be amplified without distortion for a processor to acquire in real time for fire identification and judgment, the conventional detectors in China at present adopt primary or secondary amplification for processing the infrared signals, the sensitivity is low, the dynamic property is poor, therefore, the flame detector infrared processing circuit sends the two collected infrared signals to an A/D conversion circuit in a 16-bit MCU processor after pre-amplification and filtering amplification processing to form digital quantity, and a 1uF capacitor is connected in series between each stage of filtering amplification circuit, so that the circuit can more visually reflect the characteristics of flame intensity, frequency and the like.
The optical filter between the high signal-to-noise ratio FbS detecting element and the quartz window is a high-transmittance narrow-band optical filter of 2.7um, and the optical filter between the high signal-to-noise ratio FbSe detecting element and the quartz window is a high-transmittance narrow-band optical filter of 4.4um, so that the detector can reliably detect the corresponding spectral band and reduce the probability of clutter interference.
A miniature incandescent calibration indicator lamp is arranged in the infrared calibration circuit, and a temperature sensing chip is arranged in the temperature acquisition circuit, so that infrared signals can be calibrated and temperature compensated.
The output interface circuit is a 4-20 mA current loop signal output interface circuit, current signals are output through a V5 transistor MJD31C, an internal circuit is protected through a V6 diode TVS615D, and a current output control chip adopts AD5412 of AD company.
The 16-bit MCU processor, the crystal oscillator, the program downloading and debugging interface and the peripheral resistance-capacitance circuit of the processor form a core control unit processing circuit, the 16-bit MCU processor adopts MC9S12C128CFA of NXP company, the processor has strong functions, rich interfaces and high operation speed, and provides guarantee for the rapidity and accuracy of fire judgment and analysis, the detector realizes relatively accurate fire data curve simulation and complex fire identification and judgment algorithm, a large amount of fire information experimental data is stored in the processor by analyzing and processing the voltage values of the collected ultraviolet pulse number and two paths of infrared signals, the ultraviolet infrared spectrum information and the environment temperature in the environment are collected in real time, the collected ultraviolet infrared spectrum information is subjected to software filtering and temperature compensation, and then relevant calculation and data comparison are carried out, whether a fire occurs or not is finally accurately judged, if the fire occurs, the relevant fire alarm state information is output through a 4-20 mA current loop signal.
The working principle is as follows: firstly, an external power supply input by a power supply interface is converted through a power supply conversion circuit, the voltage is boosted through an ultraviolet adjustable working voltage boosting circuit, so that power is supplied to a 0.2um ultraviolet photosensitive tube, then signal acquisition is carried out through the 0.2um ultraviolet photosensitive tube, a high signal-to-noise ratio FbS detection element and a high signal-to-noise ratio FbSe detection element, the acquired ultraviolet pulse number and two infrared signal voltage values are analyzed and processed through a 16-bit MCU processor, a large amount of fire information experiment data are stored in the processor, ultraviolet information and environment temperature in the environment are acquired in real time, infrared spectrum filtering and temperature compensation are carried out on the acquired ultraviolet infrared spectrum information, then relevant calculation and data comparison are carried out, whether fire occurs or not is finally accurately judged, if fire occurs, relevant fire alarm state information is output through 4-20 mA current loop signals, and if fire does not occur, the fire alarm signal is delayed and cancelled.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.
Claims (7)
1. The utility model provides a flame detector of two infrared of single ultraviolet, includes power source, high SNR FbS detection element and temperature acquisition circuit, its characterized in that: the power interface is connected with the 0.2um ultraviolet photosensitive tube through a power conversion circuit and an ultraviolet adjustable working voltage booster circuit, the 0.2um ultraviolet photosensitive tube is connected with the 16-bit MCU processor through an ultraviolet signal amplitude limiting and ultraviolet signal shaping circuit, the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are respectively connected with the 16-bit MCU processor through an infrared signal preposition amplifying circuit and an infrared signal filtering amplifying circuit, the 16-bit MCU processor is simultaneously connected with the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element through an infrared calibration circuit, the temperature acquisition circuit is independently connected with the 16-bit MCU processor and the 16-bit MCU processor is simultaneously connected with an output interface circuit, the 16-bit MCU processor is internally provided with an A/D conversion circuit corresponding to the infrared signal filtering amplifying circuit and a pulse counting circuit corresponding to the ultraviolet signal shaping circuit, 0.2um ultraviolet photosensitive tube, high SNR FbS detection unit and high SNR FbSe in the detector detect the unit front end and be provided with the quartz window and high SNR FbS detects the unit and high SNR FbSe detects the unit and is provided with the light filter between the quartz window.
2. A single uv dual ir flame detector according to claim 1, wherein: the 0.2um ultraviolet photosensitive tube is the photoelectric conversion device based on the ultraviolet photoelectric effect, the signal of 0.2um ultraviolet photosensitive tube output is high-voltage pulse signal.
3. A single uv dual ir flame detector according to claim 1, wherein: the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are infrared photosensitive tubes, and signals output by the high signal-to-noise ratio FbS detecting element and the high signal-to-noise ratio FbSe detecting element are weak millivolt-level signals.
4. A single uv dual ir flame detector according to claim 1, wherein: the optical filter between high SNR FbS detection element and the quartz window is 2.7 um's high transmissivity narrowband optical filter, the optical filter between high SNR FbSe detection element and the quartz window is 4.4 um's high transmissivity narrowband optical filter.
5. A single uv dual ir flame detector according to claim 1, wherein: a miniature incandescent calibration indicator lamp is arranged in the infrared calibration circuit, and a temperature sensing chip is arranged in the temperature acquisition circuit.
6. A single uv dual ir flame detector according to claim 1, wherein: the output interface circuit is a 4-20 mA current loop signal output interface circuit.
7. A single uv dual ir flame detector according to claim 1, wherein: the 16-bit MCU processor, the crystal oscillator, the program downloading debugging interface and the processor peripheral resistance-capacitance circuit form a core control unit processing circuit.
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| CN202021251612.5U CN212694546U (en) | 2020-07-01 | 2020-07-01 | Single-ultraviolet double-infrared flame detector |
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| CN202021251612.5U CN212694546U (en) | 2020-07-01 | 2020-07-01 | Single-ultraviolet double-infrared flame detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115273385A (en) * | 2022-07-11 | 2022-11-01 | 杭州海康威视数字技术股份有限公司 | Camera for flame detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115273385A (en) * | 2022-07-11 | 2022-11-01 | 杭州海康威视数字技术股份有限公司 | Camera for flame detection |
| CN115273385B (en) * | 2022-07-11 | 2024-03-26 | 杭州海康威视数字技术股份有限公司 | A camera for flame detection |
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