CN108765863A - A kind of flame detector and flame detecting alarm system - Google Patents
A kind of flame detector and flame detecting alarm system Download PDFInfo
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- CN108765863A CN108765863A CN201811037743.0A CN201811037743A CN108765863A CN 108765863 A CN108765863 A CN 108765863A CN 201811037743 A CN201811037743 A CN 201811037743A CN 108765863 A CN108765863 A CN 108765863A
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions
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Abstract
A kind of flame detector of present invention offer and flame detecting alarm system, are related to technical field of fire detection.Flame detector includes：Infrared photoinduction circuit, including the first infrared light induction sub-circuit and the second infrared light incude sub-circuit；Wherein, the first infrared light induction sub-circuit is used to monitor the infrared light radiation of the first default wave band, and the second infrared light induction sub-circuit is used to monitor the infrared light radiation of the second default wave band；Second default wave band is different from the first default wave band；Ultraviolet light induced circuit presets the ultraviolet radiation of wave band for monitoring third；Control circuit, it is connect respectively with the first infrared light induction sub-circuit, the second infrared light induction sub-circuit and ultraviolet light induced circuit, control circuit is used to receive the inductive signal of the first infrared light induction sub-circuit, the second infrared light induction sub-circuit and ultraviolet light induced circuit output, and determines whether inductive signal reaches preset Fire Conditions.Solve the problems, such as that flame detector detection is inaccurate.
Description
Technical field
The present invention relates to technical field of fire detection, alarm in particular to a kind of flame detector and flame detecting
System.
Background technology
There are the infrared lights of many nonflames occurred at random in the place of environment complexity, place for flame detector
With ultraviolet radiation interference source.And the radiation interference source that these occur at random can interfere the normal work of flame detector, cause
The case where flame detector detection makes mistake.Even when flame really occurs, flame detector can not detect fire instead
The case where flame.
Invention content
In order to overcome above-mentioned deficiency in the prior art, a kind of flame detector of present invention offer and flame detecting alarm system
System, to solve the above problems.
In order to solve the above-mentioned technical problem, first aspect of the embodiment of the present invention provides a kind of flame detector, the fire
Flame detector includes：Infrared photoinduction circuit, including the first infrared light induction sub-circuit and the second infrared light incude sub-circuit；Its
In, the first infrared light induction sub-circuit is used to monitor the infrared light radiation of the first default wave band, the second infrared light sensation
Answer infrared light radiation of the sub-circuit for monitoring the second default wave band；The second default wave band and the described first default wave band are not
Together；Ultraviolet light induced circuit presets the ultraviolet radiation of wave band for monitoring third；Control circuit, it is red with described first respectively
Outer photoinduction sub-circuit, second infrared light induction sub-circuit are connected with the ultraviolet light induced circuit, the control circuit
For receiving the first infrared light induction sub-circuit, second infrared light induction sub-circuit and the ultraviolet light induced circuit
The inductive signal of output, and determine whether the inductive signal reaches preset Fire Conditions.
Optionally, the first infrared light induction sub-circuit includes：First wave length infrared sensor, the first impedance matching electricity
Road, the first filter circuit and the first amplifying circuit；The first wave length is corresponding with the described first default wave band；The first wave length
Infrared sensor output end is electrically connected with the first impedance matching circuit input terminal, the first impedance matching circuit output end
It is electrically connected with the first filter circuit input terminal, the first filter circuit output end and first input amplifier
Electrical connection, first amplification circuit output end are electrically connected to the control circuit.
Optionally, the second infrared light induction sub-circuit includes：Second wave length infrared sensor, the second impedance matching electricity
Road, the second filter circuit and the second amplifying circuit；The second wave length is corresponding with the described second default wave band；The second wave length
Infrared sensor output end is electrically connected with the second impedance matching circuit input terminal, the second impedance matching circuit output end
It is electrically connected with the second filter circuit input terminal, the second filter circuit output end and second input amplifier
Electrical connection, second amplification circuit output end are electrically connected to the control circuit.
Optionally, the first wave length is 4.3um；The second wave length is 3.8um.
Optionally, the ultraviolet light induced circuit includes Ultraviolet sensor, pulse driving circuit, rectification circuit and ultraviolet arteries and veins
Rush receiving circuit；The pulse driving circuit input terminal is electrically connected to the control circuit, the pulse driving circuit output end
It is electrically connected with the rectification circuit input end；The rectification circuit input end is electrically connected with the Ultraviolet sensor input terminal；Institute
Ultraviolet sensor output end is stated to be electrically connected with the ultraviolet pulse receiving circuit input terminal；The ultraviolet pulse receiving circuit output
End is electrically connected to the control circuit.
Optionally, the Ultraviolet sensor is sunlight blind passage sensor.
Optionally, the flame detector further includes：First circuit board and second circuit board and power supply unit；Described first
The first wave length infrared sensor, the second wave length infrared sensor and the ultraviolet transducing is arranged in circuit board first face
Device；The second face of the first circuit board be arranged power supply unit, the power supply unit respectively with the first wave length infrared sensor,
The second wave length infrared sensor and Ultraviolet sensor electrical connection, are used for as the first wave length infrared sensor, institute
State second wave length infrared sensor and Ultraviolet sensor power supply；Wherein, the second face of the first circuit board and described first
Circuit board first face is oppositely arranged；The first face of second circuit board setting first impedance matching circuit, described first are put
Big circuit, first filter circuit, second impedance matching circuit, second amplifying circuit, second filtered electrical
Road, the pulse driving circuit, the rectification circuit and the ultraviolet pulse receiving circuit；The second face of the second circuit board is set
Set the control circuit；Wherein, the second face of the second circuit board is oppositely arranged with the first face of the second circuit board.
Optionally, the flame detector further includes：Shell, the shell are hollow cylindrical shell, the open circles
Observation portion is arranged in first bottom surface of cylindrical shell, is provided on the second bottom surface of the hollow cylindrical shell for accessing outside
The interface of cable；The first circuit board and the second circuit board is arranged in the inside of the hollow cylindrical shell；U-shaped is fixed
The both sides of arm, the U-shaped fixed arm are connect with the housing into rotation；The bottom of pedestal, the pedestal and the U-shaped fixed arm is solid
It is fixed to connect, the through-hole for being connect with external stability is provided on the pedestal.
Optionally, the shell includes first connecting portion and second connecting portion, and the first connecting portion and described second connect
Socket part is detachably connected；The first connecting portion includes the first side of first bottom surface and the hollow cylindrical shell,
The observation portion is circumferentially provided with multiple protrusions；The second connecting portion includes second bottom surface and the hollow cylinder
The second side of shell, the second side are detachably connected with the first side；Setting is used inside the second connecting portion
In the fixed structure of the fixation first circuit board and the second circuit board, the fixed structure and the first circuit board and
The second circuit board is detachably connected.
Second aspect of the embodiment of the present invention provides a kind of flame detecting alarm system, the system comprises：First aspect
Or the flame detector described in any embodiment in first aspect；External data line, the external data line and the flame
Detector is electrically connected；Host is monitored, the monitoring host is electrically connected by the external data line with the flame detector；Report
Alarm device, the warning device are electrically connected with the monitoring host.
In terms of existing technologies, a kind of flame detector provided in an embodiment of the present invention and flame detecting alarm system
At least have the advantages that：Incude sub-circuit inspection by two different infrared lights of ultraviolet light induced circuit and monitoring wave band
It surveys the radiation of three kinds of default wave bands and exports inductive signal, determine whether inductive signal reaches preset fire by control circuit
Calamity is adjusted.It solves flame detector to be interfered by extraneous radiation interference source, such as arclight, sunlight, the match lighted, Chinese herbaceous peony
Headlight light, body light light, camera flashlamp, infrared spotlight, human body infrared heat radiation, halogen lamp etc., to generate
The case where result of detection of mistake, and solve when flame really occurs, flame detector can be accurately detected flame
The problem of.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, present pre-ferred embodiments cited below particularly,
And coordinate appended attached drawing, it is described in detail below.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described.It should be appreciated that the following drawings illustrates only certain embodiments of the present invention, therefore it is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of structure chart of flame detecting alarm system provided in an embodiment of the present invention.
Fig. 2 is a kind of circuit structure diagram of flame detector provided in an embodiment of the present invention.
Fig. 3 is the structure chart of infrared photoinduction circuit side provided in an embodiment of the present invention.
Fig. 4 is the circuit structure diagram inside infrared sensor provided in an embodiment of the present invention.
Fig. 5 is the circuit structure diagram outside infrared sensor provided in an embodiment of the present invention.
Fig. 6 is the first signal waveforms of infrared photoinduction circuit provided in an embodiment of the present invention.
Fig. 7 is second of signal waveforms of infrared photoinduction circuit provided in an embodiment of the present invention.
Fig. 8 is the third signal waveforms of infrared photoinduction circuit provided in an embodiment of the present invention.
Fig. 9 is the structure chart of ultraviolet light induced circuit side provided in an embodiment of the present invention.
Figure 10 is the first signal waveforms of ultraviolet light induced circuit provided in an embodiment of the present invention.
Figure 11 is second of signal waveforms of ultraviolet light induced circuit provided in an embodiment of the present invention.
Figure 12 is the third signal waveforms of ultraviolet light induced circuit provided in an embodiment of the present invention.
Figure 13 is the structure chart of the first flame detector shell provided in an embodiment of the present invention.
Figure 14 is the structure chart of second of flame detector shell provided in an embodiment of the present invention.
Figure 15 is the structure chart of the third flame detector shell provided in an embodiment of the present invention.
Figure 16 is that the detection visual angle of flame detector provided in an embodiment of the present invention calculates schematic diagram.
Icon：10- flame detectors；20- monitors host；30- warning devices；The infrared photoinduction circuits of 100-；101-
One wavelength infrared sensor；103- second wave length infrared sensors；200- ultraviolet light induced circuits；202- Ultraviolet sensors；
300- control circuits.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes.Obviously, described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is logical
The component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment of the present invention, people in the art
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent attached drawing in a attached drawing.In addition, term " the
One ", " second " etc. is only used for distinguishing description, is not understood to indicate or imply relative importance.
Below in conjunction with the accompanying drawings, it elaborates to some embodiments of the present invention.In the absence of conflict, following
Feature in embodiment and embodiment can be combined with each other.
Traditional infrared flame detector only uses an infrared sensor as infrared acquisition channel, and combines ultraviolet biography
Sensor detection channels carry out detection.It only uses an infrared sensor to be detected, due to carrying out letter without reference to wavelength
Number comparison, the infrared sensor of Single wavelength is highly susceptible to extraneous infra-red radiation interference.Even with Ultraviolet sensor, pass through
The foundation that Ultraviolet sensor judges as another fire alarm, but as long as infrared sensor is interfered by extraneous radiation interference source,
Or the problem that the detection of flame detector can be caused inaccurate.
In view of the above problems, present inventor proposes following embodiment to solve above-mentioned ask by the exploration that studies for a long period of time
Topic.An embodiment of the present invention provides a kind of flame detectors 10, and high temperature, high humidity, heat-flash spoke are operated in for flame detector 10
It penetrates, strong electromagnetic, the harsh environment of strong mechanical oscillation, exists simultaneously jet stream, arc light, daylight, headlight light, body light
The complex situations in the external interferences sources such as light, human body infrared heat radiation, halogen lamp, have carried out a large amount of test experiments, and extraction is non-
Fire disturbing factor data are stored in flame detector 10, the analysis method being combined using time domain and frequency domain, for flame detecting
Device 10 is analysed and compared, and in practical applications, in combination with the self study technology of software, software being capable of constantly self-perfection identification calculation
Method, to realize that 10 high reliability of flame detector works.
It is better understood from this programme for ease of those skilled in the art, first introduces flame detecting alarm system below.
It please refers to shown in Fig. 1, Fig. 1 is a kind of structure chart of flame detecting alarm system provided in an embodiment of the present invention.Institute
The system of stating includes：Flame detector 10；External data line, the external data line are electrically connected with the flame detector 10；Prison
Host 20 is surveyed, the monitoring host 20 is electrically connected by the external data line with the flame detector 10；Warning device 30,
The warning device 30 is electrically connected with the monitoring host 20.
Optionally, monitoring host 20 may be, but not limited to, smart mobile phone, PC (personal computer,
PC), tablet computer, personal digital assistant (personal digital assistant, PDA), mobile internet surfing equipment (mobile
Internet device, MID) etc..
For example, the flame detector 10 used in flame detecting alarm system, can monitoring and protecting region, monitoring
When there is fire behavior to protection zone, flame detector 10 can send out fire alarm signal within the time of ms (millisecond) grade, lead to
It crosses external data line and sends fire alarm information to monitoring host 20, monitoring host 20 receives fire alarm information, according to fire
Calamity warning message drives warning device 30 to carry out fire alarm.Wire communication by then passing through external data line connects, alarm
The transmission speed of information is fast and stablizes, and the accuracy of information transmission is high and is not readily susceptible to extraneous interference.
It please refers to shown in Fig. 2, Fig. 2 is a kind of circuit structure diagram of flame detector provided in an embodiment of the present invention.It is described
Flame detector 10 includes：Infrared photoinduction circuit 100, including the first infrared light induction sub-circuit and the second infrared light inductor
Circuit；Wherein, the first infrared light induction sub-circuit is used to monitor the infrared light radiation of the first default wave band, and described second is red
Outer photoinduction sub-circuit is used to monitor the infrared light radiation of the second default wave band；The second default wave band is default with described first
Wave band is different；Ultraviolet light induced circuit 200 presets the ultraviolet radiation of wave band for monitoring third；Control circuit 300, respectively
Connect with first infrared light induction sub-circuit, second infrared light induction sub-circuit and the ultraviolet light induced circuit 200
Connect, the control circuit 300 for receive first infrared light induction sub-circuit, second infrared light induction sub-circuit and
The inductive signal that the ultraviolet light induced circuit 200 exports, and determine whether the inductive signal reaches preset fire item
Part.
Intelligible, control circuit 300 configures high-performance 32-bit microprocessor chip, can reduce because operation generates mistake
The case where result of detection.Control circuit 300 is right by using advanced flame characteristic recognizer and context information analysis criterion
The inductive signal received carries out data fusion and processing.So as to according to reception the first infrared light induction sub-circuit, second
Infrared light incudes the inductive signal that sub-circuit and ultraviolet light induced circuit 200 export, and determines whether the inductive signal reaches
To preset Fire Conditions.
Optionally, microprocessor chip uses the special microcontroller MM32F031x8 of 32 data processings, running frequency is high,
Operational capability and processing capacity are strong, and carry advanced flame characteristic recognizer and context information analysis criterion, to each
The inductive signal that sensor receives carries out data fusion and processing.There are the microprocessor chip 12 AD (touching number) to convert
Device can carry out two-way analog signal high-speed sampling and be converted into digital signal.The microprocessor chip is connect using ultraviolet pulse
It receives circuit and records ultraviolet pulse quantity.By acquiring different size of time window, analysis calculating is carried out to data in window, judgement is
No is flare up fire.Its microprocessor chip can also simultaneously can interpretation sensor abnormal signal, and carry out analyzing processing, enhance
The robustness of algorithm routine.
Intelligible, on two wave bands of infrared spectral region, two infrared lights incude sub-circuit respectively to flame light spoke
The radiation variation of nonflame optical signal responds in the center bin signal and environment penetrated, and exports the first infrared light sensation respectively
Induction signal and the second infrared light inductive signal.In conjunction with the center bin by ultraviolet light induced circuit 200 to flame light radiation
The radiation variation of nonflame optical signal responds in signal and environment, and exports ultraviolet light induced signal.Control circuit 300 connects
The first infrared light inductive signal, the second infrared light inductive signal and ultraviolet light induced signal are received, the second infrared light incudes sub-circuit
Second infrared light inductive signal of output can provide for the first infrared light inductive signal of the first infrared light induction sub-circuit can
The detection benchmark leaned on, and whether ultraviolet light occurs the basis for estimation of flame as another.According to the first infrared photoinduction
Signal, the second infrared light inductive signal and ultraviolet light induced signal, control circuit 300 can accurate measurements go out and whether really occur
Flame, while error detection can be avoided and omit the case where detecting.
Specifically, the first infrared light induction sub-circuit and the second infrared light induction sub-circuit and ultraviolet light induced electricity
Road 200 can be built into three monitoring channels, and three monitoring channels are simultaneously monitored protection zone, and export corresponding three
A inductive signal, three inductive signals are the first infrared light inductive signal, the second infrared light inductive signal and ultraviolet light induced
Signal.When there is fire behavior generation, three inductive signals generate variation simultaneously, and only there are three inductive signals to reach scheduled ratio pass
System, or be maintained in scheduled proportional region, it can just be determined as true fire behavior.
Ultraviolet sensor 202 is to the response time of flame in us (microsecond) rank, and the response time of infrared sensor is in ms
(millisecond) grade, the 300 acquisition process time of control circuit is us grades, therefore flame detector 10 is enable to respond quickly and identifies small rule
Mould flame, flame detector 10 can send out fire alarm signal within ms grades of times.
It please refers to shown in Fig. 3, Fig. 3 is the structure chart of infrared photoinduction circuit side provided in an embodiment of the present invention.Described
One infrared light incudes sub-circuit：First wave length infrared sensor 101, the first impedance matching circuit, the first filter circuit and
First amplifying circuit；The first wave length is corresponding with the described first default wave band；The first wave length infrared sensor 101 exports
End is electrically connected with the first impedance matching circuit input terminal, and the first impedance matching circuit output end is filtered with described first
Circuit input end is electrically connected, and the first filter circuit output end is electrically connected with first input amplifier, and described the
One amplification circuit output end is electrically connected with the control circuit 300.
Optionally, the second infrared light induction sub-circuit includes：Second wave length infrared sensor 103, the second impedance
With circuit, the second filter circuit and the second amplifying circuit；The second wave length is corresponding with the described second default wave band；Described second
103 output end of wavelength infrared sensor is electrically connected with the second impedance matching circuit input terminal, the second impedance matching electricity
Road output end is electrically connected with the second filter circuit input terminal, the second filter circuit output end and the second amplification electricity
Road input terminal electrical connection, second amplification circuit output end are electrically connected with the control circuit 300.
Intelligible, the output impedance of first wave length infrared sensor 101 and second wave length infrared sensor 103 compares
Height has reached 105The order of magnitude.Correspondingly, very high to the input impedance requirement of the first amplifying circuit and the second amplifying circuit, such as
The input impedance of the first amplifying circuit of fruit and the second amplifying circuit is not high enough, can cause the input impedance of the first amplifying circuit and the
The output impedance of one wavelength infrared sensor 101 mismatches, input impedance and the second wave length infrared sensing of the second amplifying circuit
The output impedance of device 103 mismatches, and first wave length infrared sensor 101 and second wave length infrared sensor 103 can be caused to export
Signal amplitude decays, and influences the detection overall performance of first wave length infrared sensor 101 and second wave length infrared sensor 103.
Intelligible, in the impedance matching and amplifying circuit of infrared photoinduction circuit 100, impedance matching circuit is using super
Low noise J-type (junction type) field-effect tube is matched and is amplified, and J-type field-effect tube has input impedance is high (can reach 108Number
Magnitude), and the low-down feature of noise.The inductive signal exported from impedance matching circuit removes direct current point by high-pass filter
After amount, amplifying circuit is entered back into.Amplifying circuit uses two-stage amplification, by way of negative-feedback between grade, stabilizes amplification electricity
The amplification factor (being about 220 times in total) on road.By using the mode of negative-feedback between two-stage amplification and grade, enhance amplifying circuit
Frequency response characteristic, to improve the stability and reliability of amplifying circuit.Since the output impedance of amplifying circuit is relatively high,
It is exported using follower in amplifying circuit tip designs, the output impedance of amplifying circuit can be reduced.
Intelligible, the inductive signal amplified by level-one amplifying circuit passes through multiple order low pass filter, low-pass filter
Cutoff frequency be 30Hz, filter out high-frequency noise, while also filtering out the effect of signals of non-pyric factor, that improves inductive signal can
By property.
Intelligible, the inductive signal amplified by second amplifying circuit is exported into A/D converter circuit, A/D converter circuit
Analog-to-digital conversion is carried out to inductive signal, transformed digital signal recycles the high-performance 32-bit configured in control circuit 300 micro-
The algorithm that processor chips are carried is handled.
Optionally, the first wave length is 4.3um (micron)；The second wave length is 3.8um.
Intelligible, it is infrared light main induction circuit, first wave length infrared sensor 101 that the first infrared light, which incudes sub-circuit,
Using 4.3um wavelength infrared sensors.It is that infrared light refers to sensor circuit that second infrared light, which incudes sub-circuit, and second wave length is infrared
Sensor 103 uses 3.8um wavelength infrared sensors.It is the infrared radiation wavelength during flame combustion due to 4.3um wavelength
Peak value, 3.8um wavelength is the valley of the infrared radiation wavelength during flame combustion, and peak value and valley have apparent differentiation,
So as to the reference sensor using 3.8um wavelength infrared sensor as 4.3um wavelength infrared sensors, to 3.8um
Wavelength infrared sensor can give 4.3um wavelength infrared sensors to provide reliable detection benchmark, it is possible to reduce the generation of wrong report,
Improve accuracy of the flame detector 10 to infrared radiation detection.
Meanwhile 3.8um wavelength infrared sensor can also filter the background signal of 4.3um wavelength infrared sensors
It removes, excludes cryogenic object heat radiation interference, to ensure detector energy correct detection to cryogenic object thermal radiation signal, being promoted should
The global reliability of flame detector 10.
Optionally, the wavelength for two infrared sensors that the technical program uses relatively closes on so that flame detector 10
When receiving same temperature infra-red radiation, the signal response amplitude of binary channels infrared sensor is almost the same.Therefore the first infrared light
The circuit design for incuding sub-circuit and the second infrared light induction sub-circuit can be consistent with two-way parameter, can reduce design risk,
It offers convenience simultaneously to produce and debugging flame detector 10.
It please refers to shown in Fig. 4 and Fig. 5, Fig. 4 is the circuit structure diagram inside infrared sensor provided in an embodiment of the present invention.
Fig. 5 is the circuit structure diagram outside infrared sensor provided in an embodiment of the present invention.
Optionally, infrared sensor type selecting is pyroelectric infrared sensor, and to be all based on pyroelectric effect former for thermocouple
The electrothermic type infrared sensor of reason, the difference is that the Seebeck coefficient of pyroelectric sensor is significantly larger than thermocouple, internal heat
Electric member filter glass window with the ferrotitanium lead plumbate mercury ceramics of high Seebeck coefficient and lithium tantalate, three sweet iron of sulfuric acid etc. forms,
Its polarize variation with temperature and change, have higher sensitivity.In order to inhibit the interference generated because own temperature changes,
The sensor by the consistent thermoelectricity member differential concatenation of two features or is connected into differential balance circuit mode in technique, contactless
It detects the infrared energy variation that object is released, and is converted into electric signal output.
Optionally, infrared sensor uses lithium tantalate thin slice as sensitive member, is capacitive signal source, and DC impedance exists
1013The Europe order of magnitude.The output of infrared sensor generally uses low noise JFET (junction type) field-effect tube, and the sampling of sensitive member
The resistance order of magnitude is 2X1011Europe or so, while the sampling resistor can also be used as the biasing resistor of J-type field-effect tube, Cd is tantalum
The sensitive member of sour lithium, G are J-type field-effect tube, Ri is sensitive first sampling resistor.Because in the junction capacity and sensor of J-type field-effect tube
Parasitic distribution capacity, making the input terminal of J-type field-effect tube, there are the equivalent input capacitance Ci of a non-physical, with biasing resistor
A RC capacity time constant for reaching second grade is constituted, therefore, the design of matching stage circuit should minimize the numerical value of Ci, institute
Reduce the numerical value of Ci as far as possible must be added to a boostrap circuit unit in circuit, wherein boostrap circuit is made using feedback
The both ends of input resistance are approximately equipotential, reduce to input circuit and ask for electric current, to improve input impedance, reduce input electricity
Hold the circuit of Ci.
Specifically, the internal structure of infrared sensor and external boostrap circuit include：It is first field-effect tube, sensitive
First, sensitive first sampling resistor；Second field-effect tube, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance,
First resistor and second resistance；
The drain electrode of first field-effect tube is electrically connected with the source electrode of the second field-effect tube, and the drain electrode of the first field-effect tube is also with
One end of one capacitance is electrically connected；The grid of first field-effect tube is electrically connected with sensitive first one end, and the grid of the first field-effect tube is also
It is electrically connected with sensitive first sampling resistor one end；The source electrode of first field-effect tube is electrically connected with the grid of the second field-effect tube, and first
The source electrode of field-effect tube is also electrically connected with one end of first resistor, and the source electrode of the first field-effect tube is also electric with one end of the 4th capacitance
Connection, the source electrode of the first field-effect tube are also electrically connected with one end of the 5th capacitance；
The sensitive member other end is electrically connected with sensitive first sampling resistor other end, the sensitive member other end also with it is described
The other end of first capacitance is electrically connected, and sensitive first other end is also electrically connected with one end of second capacitance, described sensitive
First other end is also electrically connected with one end of the third capacitance, and sensitive first other end is also electrically connected with ground terminal；
The drain electrode of second field-effect tube is electrically connected with the other end of the second capacitance, and the drain electrode of the second field-effect tube is also and third
The other end of capacitance is electrically connected, and the drain electrode of the second field-effect tube is also electrically connected with power end；
The other end of first resistor is electrically connected with the other end of the 4th capacitance, and the other end of first resistor is also electric with ground terminal
Connection；The other end of 5th capacitance is electrically connected with second resistance one end, and the other end of second resistance is first wave length infrared sensing
The output end of device 101.
It please refers to shown in Fig. 6, Fig. 7 and Fig. 8, Fig. 6 is the first letter of infrared photoinduction circuit provided in an embodiment of the present invention
Number oscillogram.Fig. 7 is second of signal waveforms of infrared photoinduction circuit provided in an embodiment of the present invention.Fig. 8 is that the present invention is real
Infrared photoinduction circuit the third signal waveforms of example offer are provided.The first signal waveform of infrared photoinduction circuit 100 is
First infrared light incudes the signal waveform that sub-circuit and the second infrared light induction sub-circuit are detected when no flame irradiates.Infrared light
Second of signal waveform of sensor circuit 100 is that the first infrared light incudes sub-circuit and the second infrared light incudes sub-circuit in small ruler
When the irradiation of very little flame, for example, lighter flare, the signal waveform of detection.The third signal wave of infrared photoinduction circuit 100
Shape is that the first infrared light incudes sub-circuit and the second infrared light incudes sub-circuit in the standard flame source irradiation that can cause fire
The signal waveform of detection.
Specifically, can be seen that by three width oscillograms, the first infrared light incudes sub-circuit and the second infrared light inductor electricity
When Lu Wu flames, the inductive signal amplitude of output be respectively 4.3 wave band amplitudes in 4.8V or so, 3.8 wave band amplitudes in 5.1V
Left and right；When small size flame irradiates, the inductive signal amplitude of output is respectively 4.3 wave band amplitude sine waves within the scope of 0.2V
Dynamic, 3.8 wave band amplitudes do not fluctuate；In the standard flame source irradiation for going out to be now able to cause fire, the inductive signal amplitude of output
Respectively 4.3 wave band amplitudes do not fluctuate within the scope of 2V in sinusoidal fluctuation, 3.8 wave band amplitudes.It is imitated since flame has flicker
It answers, so there are vertical bounce phenomenons for sinusoidal magnitude.
Three classes test waveform by three width oscillograms is provable, red in the first infrared light of design induction sub-circuit and second
It is infrared using 4.3um wavelength infrared sensor and second in the first infrared light incudes sub-circuit when outer photoinduction sub-circuit
3.8um wavelength infrared sensors are used in photoinduction sub-circuit, flame detector 10 can be made to be adapted to, and there are different temperatures
The occasion of infra-red radiation interference, improves the adaptability, stability and reliability of flame detector 10.
Correspondingly, when 4.3um wavelength infrared sensors are interfered in extraneous radiation interference source, 3.8um wavelength infrared sensings
Device does not have inductive signal output, and then control circuit 300 can make correct analytical judgment, confirms the infrared biography of 4.3um wavelength
Sensor is to be in disturbance state, rather than 4.3um wavelength infrared sensors detect flame.
It please refers to shown in Fig. 9, Fig. 9 is the structure chart of ultraviolet light induced circuit side provided in an embodiment of the present invention.The purple
Outer photoinduction circuit 200 includes Ultraviolet sensor 202, pulse driving circuit, rectification circuit and ultraviolet pulse receiving circuit；It is described
Pulse driving circuit input terminal is electrically connected with the control circuit 300, the pulse driving circuit output end and the rectified current
Road input terminal electrical connection；The rectification circuit input end is electrically connected with 202 input terminal of the Ultraviolet sensor；The ultraviolet transducing
202 output end of device is electrically connected with the ultraviolet pulse receiving circuit input terminal；The ultraviolet pulse receiving circuit output end and institute
State the electrical connection of control circuit 300.
Optionally, the Ultraviolet sensor 202 is sunlight blind passage sensor, and shielding UVA, (long wave blackspot effect is ultraviolet
Line, 320~420nm of wavelength (nanometer)) wave band and UVB (medium wave erythemal effect ultraviolet light, 275~320nm of wavelength) wave band it is dry
It disturbs, only the ultraviolet light of UVC (shortwave sterilizing ultraviolet light, 200~275nm of wavelength) wave band is made a response, response speed ratio is very fast,
It can be made a response in us (microsecond) rank.
Specifically, control circuit 300 generates 10KHz PWM (Pulse Width Modulation, a pulse width
Modulation) pulse signal, and it is sent to pulse driving circuit, the PWM input circuits of pulse driving circuit receive the pulse signal
When, the 5V direct currents of input are boosted to 350V direct currents and are output to rectification circuit by driving transformer, and rectification circuit receives 350V
Rectification is carried out after direct current, and supplies Ultraviolet sensor 202, the ultraviolet transducing when Ultraviolet sensor 202 detects UV signal
Device 202 discharges, and generates impulse waveform and exports and give ultraviolet pulse receiving circuit, by ultraviolet pulse receiving circuit to impulse waveform
Shaping is carried out, then the impulse waveform after shaping is exported to control circuit 300, control circuit 300 is to the impulse wave after the shaping
Shape carries out algorithm process, can be as to monitor the ultraviolet radiation that third presets wave band by ultraviolet light induced circuit 200
Whether fire one of criterion is occurred.
It please refers to shown in Figure 10, Figure 11 and Figure 12, Figure 10 is ultraviolet light induced circuit first provided in an embodiment of the present invention
Kind signal waveforms.Figure 11 is second of signal waveforms of ultraviolet light induced circuit provided in an embodiment of the present invention.Figure 12 is this
The third signal waveforms of the ultraviolet light induced circuit of inventive embodiments offer.The first signal of ultraviolet light induced circuit 200
Waveform is the signal waveform that ultraviolet light induced circuit 200 is detected when no flame irradiates.Second of ultraviolet light induced circuit 200
Signal waveform be ultraviolet light induced circuit 200 when small size flame irradiates, such as lighter flare, the signal wave of detection
Shape.The third signal waveform of ultraviolet light induced circuit 200 is ultraviolet light induced circuit 200 in the standard fire that can cause fire
The signal waveform that flame detects when irradiating.
Specifically, can be seen that by three width oscillograms, ultraviolet light induced circuit 200 when no flame irradiates output waveform without
Pulse signal；When small size flame is irradiated, there are a small amount of pulse signals；It is exported when the standard flame source of fire can be caused to irradiate
A large amount of pulse signals.
Since the ultraviolet radioactive that flame generates is very faint, it is desirable that detector has higher detection sensitivity.However, sensitive
It spends height and is highly prone to the influence of other ultraviolet radioactives, so that cause to report by mistake, the extremely strong purple that especially arc welding, lightning are sent out
External radiation.The flame detector 10 of the technical program design can be especially sensitive to the strong ultraviolet spectra of armor-piercing bullet flame, is true
The reliability of flame detector 10 is protected, flame detector 10 may be used in hardware components " with gate technique ", by two different waves
The infrared light inductive signal of section carries out compound judgement with ultraviolet light induced signal；A variety of criterions may be used in software section, only
Have when all parameters all meet the logical algorithm of 10 circuit of flame detector, flame detector 10 can send out fire alarm letter
Number.
It please refers to shown in Figure 13, Figure 14 and Figure 15, Figure 13 is the first flame detector shell provided in an embodiment of the present invention
The structure chart of body.Figure 14 is the structure chart of second of flame detector shell provided in an embodiment of the present invention.Figure 15 is the present invention
The structure chart for the third flame detector shell that embodiment provides.The flame detector 10 further includes：First circuit board and
Second circuit board and power supply unit；The first wave length infrared sensor 101, described the is arranged in the first face of the first circuit board
Two wavelength infrared sensors 103 and the Ultraviolet sensor 202；Power supply unit is arranged in the second face of the first circuit board, described
Power supply unit respectively with the first wave length infrared sensor 101, the second wave length infrared sensor 103 and the ultraviolet biography
Sensor 202 is electrically connected, for for the first wave length infrared sensor 101, the second wave length infrared sensor 103 and described
Ultraviolet sensor 202 is powered；Wherein, the second face of the first circuit board is oppositely arranged with the first face of the first circuit board；Institute
State the first face of second circuit board be arranged first impedance matching circuit, first amplifying circuit, first filter circuit,
It is second impedance matching circuit, second amplifying circuit, pulse driving circuit described in second filter circuit, described whole
Current circuit and the ultraviolet pulse receiving circuit；The control circuit 300 is arranged in the second face of the second circuit board；Wherein, institute
The second face of second circuit board is stated to be oppositely arranged with the first face of the second circuit board.
Optionally, the flame detector 10 further includes：Shell, the shell is hollow cylindrical shell, described hollow
Observation portion is arranged in first bottom surface of cylindrical housings, is provided on the second bottom surface of the hollow cylindrical shell outer for accessing
The interface of portion's cable；The first circuit board and the second circuit board is arranged in the inside of the hollow cylindrical shell；U-shaped is solid
The both sides of fixed arm, the U-shaped fixed arm are connect with the housing into rotation；Pedestal, the bottom of the pedestal and the U-shaped fixed arm
It is fixedly connected, the through-hole for being connect with external stability is provided on the pedestal.
Optionally, the shell includes first connecting portion and second connecting portion, and the first connecting portion and described second connect
Socket part is detachably connected；The first connecting portion includes the first side of first bottom surface and the hollow cylindrical shell,
The observation portion is circumferentially provided with multiple protrusions；The second connecting portion includes second bottom surface and the hollow cylinder
The second side of shell, the second side are detachably connected with the first side；Setting is used inside the second connecting portion
In the fixed structure of the fixation first circuit board and the second circuit board, the fixed structure and the first circuit board and
The second circuit board is detachably connected.
Specifically, by using two pieces of circuit boards, every piece of circuit board is all made of two-sided layout designs, and two pieces of circuits
It is electrically connected between plate.Setting and layout circuit on every piece of circuit board, and circuit element precision is connected on circuit, to
It gathers together.The acquisition to signal and processing may be implemented in the upper layer of two pieces of circuit boards, and the lower layer of two pieces of circuit boards can use
Final signal is acquired to provide power supply and MCU.Such as first wave length infrared sensor is arranged in first piece of circuit board upper layer
101, second wave length infrared sensor 103 and Ultraviolet sensor 202；The first impedance matching electricity is arranged in second piece of circuit board upper layer
Road, the first amplifying circuit, the first filter circuit, the second impedance matching circuit, the second amplifying circuit, the second filter circuit, pulse
Driving circuit, rectification circuit and ultraviolet pulse receiving circuit.Power supply unit is arranged in first circuit board lower layer, and second circuit board is next
Control circuit 300 is set.This combination is convenient for device layout, reasonable distribution space effectively to reduce the volume of product, greatly
All kinds of interference are reduced greatly.
Optionally, flame detector 10 can all select technical grade device in hardware design, it is ensured that hardware can be
It is worked normally under extreme weather conditions.It is by using electronic circuit special seal gum that the circuit board progress of flame detector 10 is whole
Body seals, and carries out damping using damper when installation, can not only ensure that the whole waterproof and dampproof performance of flame detector 10, but also
It may insure that flame detector 10 is without damage under thump and vibration condition.Therefore, the steady of flame detector 10 is enhanced
Qualitative and reliability.Flame detector 10 can be applied in the scene of fire of various complexity, have very strong thermal radiation resistance, electromagnetism
The ability of the external interferences such as interference, mechanical oscillation, can be in high temperature or low temperature, high humidity, work under the most harsh environment such as vibrations
Make.
It please refers to shown in Figure 16, Figure 16 is that the detection visual angle of flame detector provided in an embodiment of the present invention calculates signal
Figure.By fixing first piece of circuit board, to fixed first wave length infrared sensor 101,103 and of second wave length infrared sensor
The height of Ultraviolet sensor 202, and by first wave length infrared sensor 101, second wave length infrared sensor 103 and ultraviolet transducing
Device 202 ensure that the detective field of view angle of each sensor close to optical filter.By can be calculated, Tan θ/2=r/h, detection regards
Rink corner θ is at 120 ° or so.
In embodiment provided by the present invention, it should be understood that disclosed devices, systems, and methods can also lead to
Other modes are crossed to realize.Devices, systems, and methods embodiment described above is only schematical, for example, in attached drawing
Flow chart and block diagram show that the system of multiple embodiments according to the present invention, the possibility of method and computer program product are real
Existing architecture, function and operation.In this regard, each box in flowchart or block diagram can represent module, a journey
A part for sequence section or code, the part of the module, section or code include one or more for realizing defined
The executable instruction of logic function.It should also be noted that at some as the function of in the realization method replaced, being marked in box
It can also occur in a different order than that indicated in the drawings.For example, two continuous boxes can essentially be substantially in parallel
It executes, they can also be executed in the opposite order sometimes, this is depended on the functions involved.
It is also noted that the box in each box and block diagram and or flow chart in block diagram and or flow chart
Combination, the dedicated hardware based system of function or action as defined in execution realizes, or can be with special
The combination of hardware and computer instruction is realized.In addition, each function module in each embodiment of the present invention can be integrated in
Form an independent part together, can also be modules individualism, can also two or more modules it is integrated
Form an independent part.It can replace, it can be wholly or partly by software, hardware, firmware or its arbitrary group
It closes to realize.When implemented in software, it can entirely or partly realize in the form of a computer program product.The calculating
Machine program product includes one or more computer instructions.When loading on computers and executing the computer program instructions,
It entirely or partly generates according to the flow or function described in the embodiment of the present invention.The computer can be all-purpose computer,
Special purpose computer, computer network or other programmable devices.
The computer instruction can store in a computer-readable storage medium, or from a computer-readable storage
Medium is transmitted to another computer readable storage medium, for example, the computer instruction can be from a web-site, calculating
Machine, server or data center are (such as red by wired (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless
Outside, wirelessly, microwave etc.) mode is transmitted to another web-site, computer, server or data center.The calculating
Machine readable storage medium storing program for executing can be that any usable medium that computer can access either includes one or more usable mediums
The data storage devices such as integrated server, data center.The usable medium can be magnetic medium, (for example, floppy disk, hard
Disk, tape), optical medium (for example, DVD) or semiconductor medium (such as solid state disk Solid State Disk (SSD))
Deng.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of flame detector, which is characterized in that the flame detector includes：
Infrared photoinduction circuit, including the first infrared light induction sub-circuit and the second infrared light incude sub-circuit；Wherein, described
One infrared light induction sub-circuit is used to monitor the infrared light radiation of the first default wave band, and the second infrared light induction sub-circuit is used
In the infrared light radiation for monitoring the second default wave band；The second default wave band is different from the described first default wave band；
Ultraviolet light induced circuit presets the ultraviolet radiation of wave band for monitoring third；
Control circuit incudes sub-circuit and the purple with first infrared light induction sub-circuit, second infrared light respectively
Outer photoinduction circuit connection, the control circuit is for receiving the first infrared light induction sub-circuit, second infrared light
Incude the inductive signal of sub-circuit and the ultraviolet light induced circuit output, and determines whether the inductive signal reaches default
Fire Conditions.
2. flame detector according to claim 1, which is characterized in that first infrared light incudes sub-circuit and includes：
First wave length infrared sensor, the first impedance matching circuit, the first filter circuit and the first amplifying circuit；The first wave length with
The first default wave band corresponds to；
The first wave length infrared sensor output end is electrically connected with the first impedance matching circuit input terminal, first resistance
Anti- match circuit output end is electrically connected with the first filter circuit input terminal, the first filter circuit output end and described the
One input amplifier is electrically connected, and first amplification circuit output end is electrically connected to the control circuit.
3. flame detector according to claim 2, which is characterized in that second infrared light incudes sub-circuit and includes：
Second wave length infrared sensor, the second impedance matching circuit, the second filter circuit and the second amplifying circuit；The second wave length with
The second default wave band corresponds to；
The second wave length infrared sensor output end is electrically connected with the second impedance matching circuit input terminal, second resistance
Anti- match circuit output end is electrically connected with the second filter circuit input terminal, the second filter circuit output end and described the
Two input amplifiers are electrically connected, and second amplification circuit output end is electrically connected to the control circuit.
4. flame detector according to claim 3, which is characterized in that the first wave length is 4.3um；Second wave
A length of 3.8um.
5. flame detector according to claim 3, which is characterized in that the ultraviolet light induced circuit includes ultraviolet transducing
Device, pulse driving circuit, rectification circuit and ultraviolet pulse receiving circuit；
The pulse driving circuit input terminal is electrically connected to the control circuit, the pulse driving circuit output end with it is described whole
Current circuit input terminal is electrically connected；The rectification circuit input end is electrically connected with the Ultraviolet sensor input terminal；The ultraviolet biography
Sensor output end is electrically connected with the ultraviolet pulse receiving circuit input terminal；The ultraviolet pulse receiving circuit output end with it is described
Control circuit is electrically connected.
6. flame detector according to claim 5, which is characterized in that the Ultraviolet sensor is sunlight blind passage sense
Device.
7. flame detector according to claim 5, which is characterized in that the flame detector further includes：First circuit
Plate and second circuit board and power supply unit；
The first wave length infrared sensor, the second wave length infrared sensor and institute is arranged in the first face of the first circuit board
State Ultraviolet sensor；The second face of the first circuit board be arranged power supply unit, the power supply unit respectively with the first wave length
Infrared sensor, the second wave length infrared sensor and Ultraviolet sensor electrical connection, for being that the first wave length is red
Outer sensor, the second wave length infrared sensor and Ultraviolet sensor power supply；Wherein, the second face of the first circuit board
It is oppositely arranged with the first face of the first circuit board；
First impedance matching circuit, first amplifying circuit, first filter is arranged in the first face of the second circuit board
Wave circuit, second impedance matching circuit, second amplifying circuit, second filter circuit, pulsed drive electricity
Road, the rectification circuit and the ultraviolet pulse receiving circuit；The control circuit is arranged in the second face of the second circuit board；Its
In, the second face of the second circuit board is oppositely arranged with the first face of the second circuit board.
8. flame detector according to claim 7, which is characterized in that the flame detector further includes：
Shell, the shell are hollow cylindrical shell, and the first bottom surface setting observation portion of the hollow cylindrical shell is described
The interface for accessing External cable is provided on second bottom surface of hollow cylindrical shell；
The first circuit board and the second circuit board is arranged in the inside of the hollow cylindrical shell；
The both sides of U-shaped fixed arm, the U-shaped fixed arm are connect with the housing into rotation；
Pedestal, the pedestal are fixedly connected with the bottom of the U-shaped fixed arm, are provided with and are used for and external stability on the pedestal
The through-hole of connection.
9. flame detector according to claim 8, which is characterized in that the shell includes that first connecting portion and second connect
Socket part, the first connecting portion and the second connecting portion are detachably connected；
The first connecting portion includes the first side of first bottom surface and the hollow cylindrical shell, the observation portion
It is circumferentially provided with multiple protrusions；
The second connecting portion includes the second side of second bottom surface and the hollow cylindrical shell, the second side
It is detachably connected with the first side；
Fixed structure for fixing the first circuit board and the second circuit board, institute are set inside the second connecting portion
Fixed structure is stated to be detachably connected with the first circuit board and the second circuit board.
10. a kind of flame detecting alarm system, which is characterized in that the system comprises：
According to claim 1-9 any one of them flame detectors；
External data line, the external data line are electrically connected with the flame detector；
Host is monitored, the monitoring host is electrically connected by the external data line with the flame detector；
Warning device, the warning device are electrically connected with the monitoring host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811037743.0A CN108765863A (en) | 2018-09-06 | 2018-09-06 | A kind of flame detector and flame detecting alarm system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811037743.0A CN108765863A (en) | 2018-09-06 | 2018-09-06 | A kind of flame detector and flame detecting alarm system |
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| CN110278358A (en) * | 2019-06-17 | 2019-09-24 | 北京精英系统科技有限公司 | A kind of target detection video camera |
| CN112731245A (en) * | 2020-12-24 | 2021-04-30 | 国家卫星气象中心(国家空间天气监测预警中心) | Radiation response monitoring method for lightning detector of static track based on invariant features |
| CN114241711A (en) * | 2021-12-21 | 2022-03-25 | 中科永安(六安)科技有限公司 | Spot type flame detector method based on detection of hydrogen-containing elements and carbon-free compounds |
| CN115035683A (en) * | 2022-06-01 | 2022-09-09 | 西安应用光学研究所 | Sniping alarm system and alarming method |
| CN115410334A (en) * | 2022-08-29 | 2022-11-29 | 浙江华消科技有限公司 | Flame detection device and method |
| CN117405233A (en) * | 2023-09-19 | 2024-01-16 | 中国船舶集团有限公司第七一三研究所 | Ultraviolet-infrared dual-band composite flame detection method and device |
| CN117589292A (en) * | 2024-01-18 | 2024-02-23 | 太原晋贵信息技术服务中心 | Two-in-one flame detector for double-red-one-purple fire explosion |
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