CN101858860A - Open circuit type combustible gas detector based on optical fiber transmission and detection method thereof - Google Patents
Open circuit type combustible gas detector based on optical fiber transmission and detection method thereof Download PDFInfo
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- CN101858860A CN101858860A CN201010185623A CN201010185623A CN101858860A CN 101858860 A CN101858860 A CN 101858860A CN 201010185623 A CN201010185623 A CN 201010185623A CN 201010185623 A CN201010185623 A CN 201010185623A CN 101858860 A CN101858860 A CN 101858860A
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Abstract
The invention relates to an open circuit type combustible gas detector based on optical fiber transmission and a detection method thereof, belonging to the technical field of fire detection. The detector comprises a light source transmission component, an optical detection component, an optical fiber transmission component and a detection terminal; wherein the optical fiber interface of the light source transmission component is connected with one end of the first optical fiber interface of the optical fiber transmission component, the other end of the optical fiber interface of the optical detection component is connected with one end of the second optical fiber interface of the optical fiber transmission component, one end of the first optical fiber interface of the optical fiber transmission component is connected with the output end of the third focusing lens of the detection terminal, and the other end of the second optical fiber interface of the optical fiber transmission component is connected with the input end of the third focusing lens of the detection terminal. The optical detection component is arranged on the site of the protected area without any electrical connection or light source transmission, and the detection terminal is arranged in the equipment room or control room with a good natural environment and a good electromagnetic environment, thereby protecting the device against such adverse environmental impacts as high temperature, high humidity, high electromagnetic interference and the like, and making the device safer, more stable and more sensitive.
Description
Technical field
The invention belongs to the fire detection technology field, particularly a kind of open circuit type combustible gas detector and detection method thereof based on fiber optic conduction.
Background technology
Fire is that the harm that causes of a kind of disastrous combustion phenomena, the particularly fire that takes place in the petrochemical industry place is bigger.In the processes such as adopting, store up, transport, use at oil gas, ubiquity leakage phenomenon, oil gas are in case burning, and the intensity of a fire is difficult to control, may cause more massive fire and blast, for the type field, need survey revealing gas.Widely used in such place at present is a type combustible gas probe, the sensor that is adopted mostly is metal-oxide semiconductor (MOS) or catalytic combustion element, also have indivedual producers to adopt correlation type open circuit type combustible gas to survey, its shortcoming is: catalyst poisoning causes that easily detector lost efficacy; Detection performance is subjected to the site environment factor affecting big; Protective capability is limited; Equipment input and engineering have high input; Operation maintenance work is heavy; Have indivedual producers to provide a type infrared combustible gas probe, part has solved the detector life-span, problems such as investigative range, but still there are problems such as equipment input and engineering input are too big, operation maintenance work is heavy.
A large amount of at present combustible gas probes that use mainly have a type combustible gas probe, correlation open circuit type combustible gas detector, the advantage of these combustible gas probes is: can make response fast to the combustable gas concentration variation that the protection zone occurs, can find early that disaster hidden-trouble and fire preventing take place, and have crucial effects to personnel's life security and property safety in the protected location simultaneously; The shortcoming of its existence is: the wrong report phenomenon of detector happens occasionally; The protection zone circumstance complication; inflammable and explosive, high temperature, strong electromagnetic and many dirt; a lot of detectors failure phenomenon just occurs in very short time after putting into operation, can't realize the reliable detection of the early stage inflammable gas disaster hidden-trouble of protection zone, bring hidden danger to management of fire safety.
Summary of the invention
For solving the deficiency of above detector, the present invention proposes a kind of open circuit type combustible gas detector and detection method thereof based on fiber optic conduction, utilize the optical detection assembly, initiatively launch the light source launching assembly and the Optical Fiber Transmission assembly of infrared light supply, realize surveying more fast, delicately on-the-spot combustable gas concentration, and adapt to extreme natural environment more, improve the reliability of detector.
Technical scheme of the present invention is achieved in that this device comprises light source launching assembly, optical detection assembly, Optical Fiber Transmission assembly and surveys terminal; One end of the optical fiber interface of light source launching assembly connects an end of first optical fiber interface of Optical Fiber Transmission assembly, one end of the optical fiber interface of optical detection assembly connects an end of second optical fiber interface of Optical Fiber Transmission assembly, the other end of first optical fiber interface of Optical Fiber Transmission assembly connects the output terminal of the 3rd condenser lens of surveying terminal, and the other end of second optical fiber interface of Optical Fiber Transmission assembly connects the input end of the 4th condenser lens of surveying terminal;
Described light source launching assembly is made up of optical fiber interface, first condenser lens, first optical filter, first amasthenic lens, first housing of light source launching assembly; The left side is equipped with first condenser lens of light source launching assembly in first housing, and the centre is equipped with first optical filter, and the right side is equipped with first amasthenic lens; The other end of the optical fiber interface of light source launching assembly connects first condenser lens of the light source launching assembly in left side in first housing; Described first housing is half elliptic;
Described optical detection assembly is made up of optical fiber interface, second housing of second amasthenic lens, second optical filter, second condenser lens, optical detection assembly; The left side is equipped with second amasthenic lens in second housing, and the centre is equipped with second optical filter, and the right side is equipped with second condenser lens; The other end of the optical fiber interface of optical detection assembly connects second amasthenic lens (2-3) on right side in second housing; Described second housing is half elliptic;
Described Optical Fiber Transmission assembly is made up of first optical fiber interface and second optical fiber interface, and optical fiber interface comprises optical fiber, and described optical fiber is the optical cable that has sheath;
Described detection terminal is made up of the 3rd condenser lens, the 4th condenser lens, infrared transmitter, the driving circuit that transmits, signal input circuit, signal output apparatus, first infrared remote receiver, second infrared remote receiver, signal extraction and amplifying circuit, signal processing circuit;
The input end of the 3rd condenser lens connects the output terminal of infrared transmitter, the input end of infrared transmitter connects the output terminal of the driving circuit that transmits, the input end of driving circuit of transmitting connects first output terminal of signal processing circuit, the output terminal of signal input circuit connects the first input end of signal processing circuit, the input end of signal output apparatus connects second input end of signal processing circuit, first output terminal of the 4th condenser lens connects the input end of the first infrared interface device, second output terminal of the 4th condenser lens connects the input end of second infrared remote receiver, the output terminal of first infrared remote receiver connects the first input end of signal extraction and amplifying circuit, the output terminal of second infrared remote receiver connects second input end of signal extraction and amplifying circuit, and the output terminal of signal extraction and amplifying circuit connects second input end of signal processing circuit.
The infrared combustible gas probe of open type optical fiber of the present invention, signal transduction process is as follows:
Signal processing circuit is sent the electric signal control command, produces drive signal through the driving circuit that transmits, and exports to infrared transmitter; Infrared transmitter is received control command, and the emission infrared signal is given light source launching assembly; The optical fiber interface of light source launching assembly receives infrared signal, the condenser lens of light source launching assembly passes to optical filter after with this signals diverging, optical filter carries out optically filtering, filtered diverging light signal is passed to amasthenic lens, line focus camera lens conversion is that the optical detection assembly is given in horizontal output behind the directional light with the diverging light conversion of signals; The amasthenic lens of optical detection assembly receives parallel optical signal, input focus camera lens after optical filter filtering, and a part of light signal is imported first infrared remote receiver after the line focus lens focus, and another part light signal is imported second infrared remote receiver; First infrared remote receiver and second infrared remote receiver convert light signal to electric signal, export to signal extraction and amplifying circuit; Signal extraction and amplifying circuit carry out narrow-band filtering and integration, and the electric signal behind the integration is inputed to signal processing circuit, and the line data of going forward side by side is handled.
When having inflammable gas in the space, infrared signal can be attenuated, and judges gas concentration and the open circuit type combustible gas detection method based on fiber optic conduction of reporting to the police according to attenuation degree, and step is as follows:
Step 1: in the air during no inflammable gas, the first infrared remote receiver receiver gases detecting band infrared signal X1, second infrared remote receiver receives the waveband infrared signal Y1 of reference background, should be worth as standard value and preserve;
Step 2: first infrared remote receiver and second infrared remote receiver constantly receive infrared signal: the waveband infrared signal of the detection of gas that first infrared remote receiver receives is X2, and it is Y2 that second infrared remote receiver receives the waveband infrared signal of reference background;
Step 3: determine to survey increment, formula is as follows:
ΔX＝X2-X1
ΔY＝Y2-Y1
In the formula, Δ X represents the waveband infrared acquisition of signal increment of detection of gas, and Δ Y represents the waveband infrared acquisition of signal increment of reference background, described Δ Y, if Δ Y＞0, the luminous intensity of reduction infrared transmitter, if Δ Y＜0, the luminous intensity of enhancing infrared transmitter;
Step 4: if
Then judge and do not have inflammable gas, execution in step 2 in the air; If Δ Y=0 and Δ X ≠ 0 or
Then judge to have inflammable gas in the air, and calculate combustable gas concentration;
Step 5: report to the police.
The first infrared remote receiver receiver gases detecting band infrared signal X={X1, X2 ... Xn}, its wavelength coverage is: the 1.55-1.70 micron; 2.2-2.40 micron 3.3-3.60 micron;
Second infrared remote receiver receives reference background band signal Y={Y1, Y2, Yn}, described reference background band signal is meant: when gas is arranged, gas does not have influence or the very little wave band of influence to this band signal, and span is: 0.1-1.54 micron, 1.71-2.1 micron, 2.41-3.2 micron, the 3.61-10 micron;
The described C of step 4 is a constant, sets up this value on their own, and its span is 100-1000, sets different stage according to the requirement of varying environment.
Advantage of the present invention: optical detection assembly of the present invention is installed in the scene, protection zone and connects without any electrical equipment; light emitted and survey terminal and be installed in physical environment and electromagnetic environment equipment room or pulpit preferably; assurance device is not subjected to environmental impacts such as abominable high temperature, high humidity and strong electromagnetic, and is safer, stable, sensitive.
Description of drawings
Fig. 1 is a kind of open circuit type combustible gas detector light source launching assembly based on fiber optic conduction, optical detection assembly assumption diagram;
Fig. 2 is a kind of open circuit type combustible gas detector Optical Fiber Transmission assembly based on fiber optic conduction, detection terminal structure figure;
Fig. 3 is a kind of driving circuit schematic diagram that transmits of surveying terminal based on the open circuit type combustible gas detector of fiber optic conduction;
Fig. 4 is a kind of signal input circuit schematic diagram of surveying terminal based on the open circuit type combustible gas detector of fiber optic conduction;
Fig. 5 is a kind of signal output apparatus schematic diagram of surveying terminal based on the open circuit type combustible gas detector of fiber optic conduction;
Fig. 6 is a kind of signal extraction and amplifying circuit schematic diagram of surveying terminal based on the open circuit type combustible gas detector of fiber optic conduction;
Fig. 7 is a kind of luminotron circuit theory diagrams of surveying terminal based on the open circuit type combustible gas detector of fiber optic conduction;
Fig. 8 is a kind of open circuit type combustible gas detection method process flow diagram based on fiber optic conduction.
Among the figure, 1 light source launching assembly, 2 optical detection assemblies, 3 Optical Fiber Transmission assemblies, 4 survey terminal, the optical fiber interface of 1-1 light source launching assembly, 1-2 first condenser lens, 1-3 first optical filter, 1-4 first amasthenic lens, 1-5 first housing, 2-1 second amasthenic lens, 2-2 second optical filter, 2-3 second condenser lens, the optical fiber interface of 2-4 optical detection assembly, 2-5 second housing, 3-1 first optical fiber interface, 3-2 second optical fiber interface, 4-1 the 3rd condenser lens, 4-2 the 4th condenser lens, 4-3 infrared transmitter, the 4-4 driving circuit that transmits, the 4-5 signal input circuit, the 4-6 signal output apparatus, 4-7 first infrared remote receiver, 4-8 second infrared remote receiver, 4-9 signal extraction and amplifying circuit, the 4-10 signal processing circuit.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Fig. 1 and Fig. 2 are one-piece construction figure of the present invention, comprise light source launching assembly (1), optical detection assembly (2), Optical Fiber Transmission assembly (3) and survey terminal (4); One end of the optical fiber interface of light source launching assembly (1-1) connects an end of first optical fiber interface (3-1) of Optical Fiber Transmission assembly (3), one end of the optical fiber interface of optical detection assembly (2-4) connects an end of second optical fiber interface (3-2) of Optical Fiber Transmission assembly (3), the other end of first optical fiber interface (3-1) of Optical Fiber Transmission assembly (3) connects the output terminal of the 3rd condenser lens (4-1) of surveying terminal (4), and the other end of second optical fiber interface (3-2) of Optical Fiber Transmission assembly (3) connects the input end of the 4th condenser lens (4-2) of surveying terminal (4);
Described light source launching assembly (1) is made up of optical fiber interface (1-1), first condenser lens (1-2), first optical filter (1-3), first amasthenic lens (1-4), first housing (1-5) of light source launching assembly; The left side is equipped with first condenser lens (1-2) of light source launching assembly (1) in first housing (1-5), and the centre is equipped with the first optics wave filter (1-3), and the right side is equipped with first amasthenic lens (1-4); The other end of the optical fiber interface of light source launching assembly (1-1) connects first condenser lens (1-2) of the light source launching assembly (1) in left side in first housing (1-5); Described first housing (1-5) is half elliptic;
Described optical detection assembly (2) is made up of optical fiber interface (2-4), second housing (2-5) of second amasthenic lens (2-1), second optical filter (2-2), second condenser lens (2-3), optical detection assembly; The left side is equipped with second amasthenic lens (2-1) in second housing (2-5), and the centre is equipped with second optical filter (2-2), and the right side is equipped with second condenser lens (2-3); The other end of the optical fiber interface of optical detection assembly (2-4) connects second amasthenic lens (2-3) on the interior right side of second housing (2-5); Described second housing (2-5) is half elliptic;
Described Optical Fiber Transmission assembly (3) is made up of first optical fiber interface (3-1) and second optical fiber interface (3-2), and optical fiber interface comprises optical fiber, and described optical fiber is the optical cable that has sheath;
Described detection terminal (4) is made up of the 3rd condenser lens (4-1), the 4th condenser lens (4-2), infrared transmitter (4-3), the driving circuit that transmits (4-4), signal input circuit (4-5), signal output apparatus (4-6), first infrared remote receiver (4-7), second infrared remote receiver (4-8), signal extraction and amplifying circuit (4-9), signal processing circuit (4-10);
The input end of the 3rd condenser lens (4-1) connects the output terminal of infrared transmitter (4-3), the input end of infrared transmitter (4-3) connects the output terminal of driving circuit (4-4) that transmit, the input end of driving circuit (4-4) of transmitting connects first output terminal of signal processing circuit (4-10), the output terminal of signal input circuit (4-5) connects the first input end of signal processing circuit (4-10), the input end of signal output apparatus (4-6) connects second output terminal of signal processing circuit (4-10), first output terminal of the 4th condenser lens (4-2) connects the input end of the first infrared interface device (4-7), second output terminal of the 4th condenser lens (4-2) connects the input end of second infrared remote receiver (4-8), the output terminal of first infrared remote receiver (4-7) connects the first input end of signal extraction and amplifying circuit (4-9), the output terminal of second infrared remote receiver (4-8) connects second input end of signal extraction and amplifying circuit (4-9), and the output terminal of signal extraction and amplifying circuit (4-9) connects second input end of signal processing circuit (4-10).
Signal drive circuit as shown in Figure 3, comprise field effect transistor, transformer, diode, resistance, electric capacity and inductance and transmitting illuminant LAMP2, described transformer is made up of the first transformer T3 and the second transformer T4, described diode is made up of the first diode D14 and the second diode D13, described resistance is made up of first resistance R 11, second resistance R 38 and the 3rd resistance R 48, described electric capacity is made up of first capacitor C 7, second capacitor C 20, the 3rd capacitor C 8 and the 4th capacitor C 28, and described inductance is made up of first inductance L 3 and second inductance L 4;
The source electrode of field effect transistor Q2 connects the end of the first transformer T3, another termination power VCC of the first transformer T3, the grid of field effect transistor Q2 connects the DRV1 pin of signal processing circuit, the drain electrode of field effect transistor Q2 connects simulation ground, first transformer T3 load a end connects an end of first capacitor C 7, the other end of first capacitor C 7 connects the positive pole of the first diode D14, one end of first resistance R 11, the negative pole of the first diode D14, the other end of first resistance R 11, one end of second capacitor C 20 connects an end of first inductance L 3, the other end of second capacitor C 20 connects first transformer T3 load b end and connects simulation ground, the other end of first inductance L 3 connects the end of the second transformer T4, the other end of the second transformer T4 connects the end of emission energy LAMP2, the other end of emission energy LAMP2 connects an end of second inductance L 4, another termination simulation ground of second inductance L 4, the load e end of the second transformer T4 connects an end of second resistance R 38, the other end of second resistance R 38 connects an end of the 4th capacitor C 28, the other end of the 4th capacitor C 28, the load f of the second transformer T4 holds an end that links to each other and connect the 3rd resistance R 48, the other end of the 3rd resistance R 48 connects an end of the 3rd capacitor C 8, the negative pole of the second diode D13, the positive pole of the second diode D3 connects first transformer T1 load c end, and the load d end of the first transformer T1 connects the other end of the 3rd capacitor C 8.
Signal input circuit as shown in Figure 4, comprise signal driver, diode, resistance, electric capacity, described signal driver is formed U2A and is formed by the first signal driver U1A, secondary signal driver U1B, the 3rd signal driver U1C, the 4th signal driver U1D, the 5th signal driver U1E, the 6th signal driver U1F, the 7th signal driver; Described diode is made up of the first diode D15, the second diode D16, the 3rd diode D17, the 4th diode D18, the 5th diode D19, the 6th diode D20, the 7th diode D21; Described resistance is by first resistance R 51, second resistance R 52, the 3rd resistance R 53, the 4th resistance R 54, the 5th resistance R 55, the 6th resistance R 56, the 7th resistance R 57, the 8th resistance R 64, the 9th resistance R 65, the tenth resistance R the 66, the 11 resistance R the 67, the 12 resistance R the 68, the 13 resistance R the 69, the 14 resistance R 70, and described electric capacity is made up of first capacitor C 30, second capacitor C 31, the 3rd capacitor C 32, the 4th capacitor C 33, the 5th capacitor C 34, the 6th capacitor C 37, the 7th capacitor C 38;
The positive pole of the first diode D15 connects an end of first resistance R 51, one end of second resistance R 52, the negative pole of the first diode D15 connects 1 end of the first signal driver U1A, the other end of second resistance R 52, one end of first capacitor C 30,2 ends of the first signal driver U1A connect the LEFT_IN end of signal processing circuit, the other end ground connection of first capacitor C 30, the other end of first resistance R 51 connects an end of the 3rd resistance R 53, one end of the 5th resistance R 55, one end of the 7th resistance R 57, one end of the 9th resistance R 65, one end of the 11 resistance R 67, one end of the 13 resistance R 69,14 ends of the 7th signal driver U2A also connect+the 5V power supply, the other end of the 3rd resistance R 53 connects an end of the 4th resistance R 54, the positive pole of the second diode D16, the negative pole of the second diode D16 connects the other end of the 4th resistance R 54,3 ends of secondary signal driver U1B, one end of second capacitor C 31,4 ends of secondary signal driver U1B connect the RIGHT_IN end of signal processing circuit, the other end ground connection of second capacitor C 31, the other end of the 5th resistance R 55 connects an end of the 6th resistance R 56, the positive pole of the 3rd diode D17, the negative pole of the 3rd diode D17 connects the other end of the 6th resistance R 56, one end of the 3rd capacitor C 32,5 ends of the 3rd signal driver U1C, the UP_IN end of the 6 termination signal processing circuits of the 3rd signal driver U1C, the other end ground connection of the 3rd capacitor C 32, the other end of the 7th resistance R 57 connects the positive pole of the 4th diode D18, one end of the 8th resistance R 64, the negative pole of the 4th diode D18 connects the other end of the 8th resistance R 64, one end of the 4th capacitor C 33,9 ends of the 4th signal driver U1D, 8 ends of the 4th signal driver U1D connect the DOWN_IN end of signal processing circuit, the other end ground connection of the 4th capacitor C 33; The other end of the 9th resistance R 65 connects an end of the tenth resistance R 66, the positive pole of the 5th diode D19, the negative pole of the 5th diode D19 connects the other end of the tenth resistance R 66, one end of the 5th capacitor C 34,11 ends of the 5th signal driver U1E, the other end ground connection of the 5th capacitor C 34,10 ends of the 5th signal driver U1E connect the MENU_IN end of signal processing circuit, the other end of the 11 resistance R 67 connects the positive pole of the 6th diode D20, one end of the 12 resistance R 68, the negative pole of the 6th diode D20 connects 13 ends of the 6th signal driver U1F, the other end of the 12 resistance R 68, one end of the 6th capacitor C 37,12 ends of the 6th signal driver U1F connect the XIAOYIN_IN end of signal processing circuit, the other end of the 6th capacitor C 37 connects 7 ends and the ground connection of the 7th signal driver U2A, the other end of the 13 resistance R 69 connects an end of the 14 resistance R 70, the positive pole of the 7th diode D21, the other end of the 14 resistance R 70 connects the negative pole of the 7th diode D21, one end of the 7th capacitor C 38,1 end of the 7th signal driver U2A, one end ground connection of the 7th capacitor C 38,2 ends of the 7th signal driver U2A connect the SELFTEST_IN end of signal processing circuit;
Signal output apparatus as shown in Figure 5, comprise LCD display J6, the drain electrode of the first field effect transistor Q5 of LCD display J6, the grid of the first field effect transistor Q5 connects an end of first resistance R 32, the source electrode of the first field effect transistor Q5 connects+the 5V power supply, the other end of first resistance R 32 connects the LCD-BL end of signal processing circuit, the LCD-BL pin of LCD display J6, the LCDRST pin, the LCDCSB pin, the LCDCSA pin, the LDCRS/CSS pin, DBO～DB7 pin connects the LCD-BL pin of signal processing circuit 4-10, the LCDRST pin, the LCDCSB pin, the LCDCSA pin, the LDCRS/CSS pin, DBO～DB7 pin.
Signal extraction and amplifying circuit are as shown in Figure 6, comprise field effect transistor, sensor, amplifier, diode, tunnel diode, electric capacity, electrochemical capacitor and resistance, described field effect transistor is made up of the first field effect transistor Q6, the second field effect transistor Q8, described sensor is made up of first sensor S3, the second sensor S4, and described amplifier is made up of the first amplifier U4A, the second amplifier U4B, the 3rd amplifier U4C, the 4th amplifier U4D, the 5th amplifier U8A, the 6th amplifier U8B; Described diode is made up of the first diode D22, the second diode D23, the 3rd diode D26, the 4th diode D27; Described tunnel diode is made up of the first tunnel diode D24, the second tunnel diode D25; Described electric capacity is by first capacitor C 42, second capacitor C 43, the 3rd capacitor C 44, the 4th capacitor C 45, the 5th capacitor C 46, the 6th capacitor C 47, the 7th capacitor C 48, the 8th capacitor C 51, the 9th capacitor C 52, the tenth capacitor C 53, the 11 capacitor C 54, the 12 capacitor C 55, the 13 capacitor C 56, the 14 capacitor C 57, the 15 capacitor C 58, the 16 capacitor C 59, the 17 capacitor C 61, the 18 capacitor C 62 is formed, and described electrochemical capacitor is by the first electrochemical capacitor E1, the second electrochemical capacitor E2, the 3rd electrochemical capacitor E5, the 4th electrochemical capacitor E8, the 5th electrochemical capacitor E9, the 6th electrochemical capacitor E26, the 7th electrochemical capacitor E15, the 8th electrochemical capacitor E20, the 9th electrochemical capacitor E21, the tenth electrochemical capacitor E22, the 11 electrochemical capacitor E23, the 12 electrochemical capacitor E24, the 13 electrochemical capacitor E25, the 14 electrochemical capacitor E28 forms; Described resistance is by first resistance R 73, second resistance R 74, the 3rd resistance R 75, the 4th resistance R 76, the 5th resistance R 77, the 6th resistance R 78, the 7th resistance R 79, the 8th resistance R 80, the 9th resistance R 83, the tenth resistance R 84, the 11 resistance R 85, the 12 resistance R 86, the 13 resistance R 87, the 14 resistance R 88, the 15 resistance R 89, the 16 resistance R 90, the 17 resistance R 91, the 18 resistance R 92, the 19 resistance R 93, the 20 resistance R 94, the 21 resistance R 95, the 22 resistance R 96, the 23 resistance R 97, the 24 resistance R 98, the 25 resistance R 99, the 26 resistance R 100, the 27 resistance R 101, the 28 resistance R 102, the 29 resistance R 103, the 30 resistance R 104, the 31 resistance R 105, the 32 resistance R 106, the 33 resistance R 107 is formed; One end of first capacitor C 42 connects the positive pole of the first electrochemical capacitor E1, one end of first resistance R 73, one end of second resistance R 74, one end of the 3rd capacitor C 44, one end of the 4th capacitor C 45 and the grid of first sensor S3, the other end of first capacitor C 42 connects the negative pole of the first electrochemical capacitor E1, one end of the other end of second resistance R 74 and the 3rd resistance R 75, the other end of first resistance R 73 connects an end of second capacitor C 43, the end of the second electrochemical capacitor E2, the drain electrode of the first field effect transistor Q6 also meets power vd D12V, the other end of second capacitor C 43 connects negative pole and the ground connection of the second electrochemical capacitor E2, the other end of the 3rd capacitor C 44 connects the source electrode of the first field effect transistor Q6, one end of the drain electrode of first sensor S3 and the 5th capacitor C 46, the other end of the 4th capacitor C 45 connects the grid of the first field effect transistor Q6, the source electrode of first sensor S3, the other end of the 5th capacitor C 46, the other end of the 3rd resistance R 75 link to each other and connect the 3rd electrochemical capacitor E5 positive pole and, the negative pole of the 3rd electrochemical capacitor E5 connects an end of the 4th resistance R 76, the other end of the 4th resistance R 76 connects the inverting input 2 of the first operational amplifier U4A, one end of the 6th capacitor C 47, one end of the 6th resistance R 78, the other end of the 6th capacitor C 47, the other end of the 6th resistance R 78 resistance and the output terminal 1 of the first operational amplifier U4A are connected and connect the negative pole of the 4th electrochemical capacitor E8, the in-phase input end 3 of the first operational amplifier U4A connects an end of the 5th resistance R 77, the 11 end ground connection of the first operational amplifier U4A, the 4 termination VDD12V of the first operational amplifier U4A, the other end of the 5th resistance R 77 connects an end of the 8th resistance R 80, the other end of the 8th resistance R 80 connects the in-phase input end 5 of the second operational amplifier U4B, the positive pole of the 4th electrochemical capacitor E8 connects an end of the 7th resistance R 79, the other end of the 7th resistance R 79 connects an end of the 7th capacitor C 48, one end of the 9th resistance R 83, the inverting input 6 of the second operational amplifier U4B, the other end of the 7th capacitor C 48, the other end of the 9th resistance R 83, the output terminal 7 of the second operational amplifier U4B connects and connects the positive pole of the 5th electrochemical capacitor E9, the negative pole of the 5th electrochemical capacitor E9 connects an end of the tenth resistance R 84, the normal phase input end 10 of the 3rd operational amplifier UC4, the other end of the tenth resistance R 84 connects an end of the 20 resistance R 94, one end of the 21 resistance R 95, the other end of the 20 resistance R 94 connects an end of the 18 resistance R 92, the negative pole of the first tunnel diode D24, the other end of the 18 resistance R 92 connects power vd D12V, the positive pole of the first tunnel diode D24 connects the negative pole of the second diode D25, and the other end of the 21 resistance R 95 connects the anodal and ground connection of the second tunnel diode D25; The inverting input 9 of the 3rd operational amplifier U4C connects an end of the 11 resistance R 85, one end of the 12 resistance R 86, one end of the 8th capacitor C 51, the other end of the 12 resistance R 86 connects the other end of the 8th capacitor C 51, the output terminal 8 of the 3rd operational amplifier U4C also connects the positive pole of the first diode D22, the other end of the 11 resistance R 85 connects the positive pole of the 6th electrochemical capacitor E26, the minus earth of the 6th electrochemical capacitor E26, the end that the negative pole of the first diode D22 connects the 13 resistance R 87 is connected an end of the 14 resistance R 88 with the other end of the 13 resistance R 87, one end of the 9th capacitor C 52, the positive pole of the 7th electrochemical capacitor E15 links to each other and connects the positive pole of the second diode D23, the negative pole of the second diode D23 meets power supply VCC, the other end of the 14 resistance R 88 connects an end of the 15 resistance R 89 and connects the SIN1 end of signal processing circuit, and the other end of the 15 resistance R 89 connects the other end of the 9th capacitor C 52, the negative pole of the 7th electrochemical capacitor E15 and ground connection; One end of the tenth capacitor C 53 connects the positive pole of the 8th electrochemical capacitor E20, one end of the 16 resistance R 90, one end of the 17 resistance R 91, one end of the 12 capacitor C 55, one end of the 13 capacitor C 56, the grid of the second sensor S4, the other end of the tenth capacitor C 53 connects the negative pole of the 8th electrochemical capacitor E20, the other end of the 17 resistance R 91, one end of the 19 resistance R 93, the other end of the 16 resistance R 90 connects an end of the 11 capacitor C 54, the positive pole of the 9th electrochemical capacitor E21, the drain electrode of the second field effect transistor Q8 also meets power vd D12V, the other end of the 11 capacitor C 54 connects negative pole and the ground connection of the 9th electrochemical capacitor E21, the other end of the 12 capacitor C 55 connects the drain electrode of the second sensor S4, one end of the 14 capacitor C 57, the other end of the 13 capacitor C 56 connects the source electrode of the second sensor S4, the other end of the 14 capacitor C 57, the grid of the second field effect transistor Q8, the other end of the 19 resistance R 93, the positive pole of the tenth electrochemical capacitor E22, the negative pole of the tenth electrochemical capacitor E22 connects an end of the 22 resistance R 96, the other end of the 22 resistance R 96 connects an end of 15 capacitor C 58, one end of the 24 resistance R 98, the inverting input 13 of four-operational amplifier U4D, the other end of the 15 capacitor C 58 connects the other end of 24 resistance R 98, the output terminal 14 of four-operational amplifier U4D, the negative pole of the 11 electrochemical capacitor E23, the positive pole of the 11 electrochemical capacitor E23 connects an end of the 25 resistance R 99, the other end of the 25 resistance R 99 connects the inverting input 2 of the 5th operational amplifier U8A, one end of the 16 capacitor C 59, one end of the 27 resistance R 101, the other end of the 16 capacitor C 59, the other end of the 27 resistance R 101 connects the output terminal 1 of the 5th operational amplifier U8A and connects the positive pole of the 12 electrochemical capacitor E24, the normal phase input end 12 of four-operational amplifier U4D connects an end of the 23 resistance R 97, the other end of the 23 resistance R 97 connects an end of the 26 resistance R 100, the other end of the 26 resistance R 100 connects the normal phase input end 3 of the 5th operational amplifier U8A, the negative pole of the 12 electrochemical capacitor E24 connects the other end of the 28 resistance R 102, the normal phase input end of the 6th operational amplifier U8B, the reversed-phase output 6 of the 6th operational amplifier U8B connects, one end of the 29 resistance R 103, one end of the 30 resistance R 104, one end of the 17 capacitor C 61, the other end of the 29 resistance R 103 connects the positive pole of the 13 electrochemical capacitor E25, the minus earth of the 13 electrochemical capacitor E25, the other end of the 30 resistance R 104, the other end of the 17 capacitor C 61 connects the output terminal 7 of the 6th operational amplifier U8B and connects the positive pole of the 3rd diode D26, the negative pole of the 3rd diode D26 connects an end of the 31 resistance R 105, the other end of the 31 resistance R 105 connects an end of the 32 resistance R 106, the positive pole of the 4th diode D27, one end of the 18 capacitor C 62, the positive pole of the 14 electrochemical capacitor E28, the negative pole of the 4th diode D27 meets power supply VCC, the other end of the 32 resistance R 106 connects an end of the 33 resistance R 107 and connects the SIN2 end of signal processing circuit, and the other end of the 33 resistance R 107 connects the other end of the 18 capacitor C 62, the negative pole of the 14 electrochemical capacitor E28 and ground connection.
The luminotron circuit as shown in Figure 7, comprise field effect transistor, resistance and LED luminotron, wherein, field effect transistor is made up of the first field effect transistor Q3 and the second field effect transistor Q4, and resistance is made up of first resistance R 22, second resistance R 25, the 3rd resistance R 24, the 4th resistance R 26, the 5th resistance R 29; One end of first resistance R 22 connects the R LED end of signal processing circuit, the other end of first resistance R 22 connects the grid of field effect transistor Q3, the drain electrode of the first field effect transistor Q3 connects an end of second resistance R 25, the other end of second resistance R 25 connects 2 ends of LED luminotron, the source ground of the first field effect transistor Q3,1 end of LED luminotron connects an end of the 3rd resistance R 24, another termination power VCC of the 3rd resistance R 24,3 ends of LED luminotron connect an end of the 5th resistance R 29, the other end of the 5th resistance R 25 connects the drain electrode of the second field effect transistor Q4, the grid of the second field effect transistor Q4 connects an end of the 4th resistance R 26, and the other end of the 4th resistance R 26 connects the G_LED end of signal processing circuit.
Adopt the open circuit type combustible gas detection method based on fiber optic conduction of the present invention as shown in Figure 8, may further comprise the steps:
Step 1: do not have inflammable gas, no infrared signal in the air: the first infrared remote receiver receiver gases detecting band infrared signal X1, second infrared remote receiver receives the waveband infrared signal Y1 of reference background, should be worth as standard value and preserve;
Step 2: do not have inflammable gas in the air, infrared signal is arranged: first infrared remote receiver and second infrared remote receiver constantly receive infrared signal: the waveband infrared signal of the detection of gas that first infrared remote receiver receives is X2, and it is Y2 that second infrared remote receiver receives the waveband infrared signal of reference background;
Step 3: determine to survey increment, formula is as follows:
ΔX＝X2-X1
ΔY＝Y2-Y1
In the formula, Δ X represents the waveband infrared acquisition of signal increment of detection of gas, and Δ Y represents the waveband infrared acquisition of signal increment of reference background, described Δ Y, if Δ Y＞0, the luminous intensity of reduction infrared transmitter, if Δ Y＜0, the luminous intensity of enhancing infrared transmitter;
Step 4:
Then judge and do not have inflammable gas, execution in step 2 in the air;
If have inflammable gas in the air,, then have as propane:
Step 2: do not have inflammable gas in the air, infrared signal is arranged: first infrared remote receiver and second infrared remote receiver constantly receive infrared signal: the waveband infrared signal of the detection of gas that first infrared remote receiver receives is X2, and it is Y2 that second infrared remote receiver receives the waveband infrared signal of reference background;
Step 3: determine to survey increment, formula is as follows:
ΔX＝X2-X1
ΔY＝Y2-Y1
In the formula, Δ X represents the waveband infrared acquisition of signal increment of detection of gas, and Δ Y represents the waveband infrared acquisition of signal increment of reference background, described Δ Y, if Δ Y＜0, the luminous intensity of reduction infrared transmitter, if Δ Y＜0, the luminous intensity of enhancing infrared transmitter;
Step 4: Δ Y=0 and Δ X ≠ 0 or
Judge in the air to have inflammable gas, calculate combustable gas concentration, demarcate with the gas that configures concentration, air is 0, and pure inflammable gas is 1000, and setting the C value is 100,2.2 ten thousand PPM that then corresponding inflammable gas is;
Step 5: report to the police.
Claims (9)
1. the open circuit type combustible gas detector based on fiber optic conduction is characterized in that: comprise light source launching assembly (1), optical detection assembly (2), Optical Fiber Transmission assembly (3) and survey terminal (4); One end of the optical fiber interface of light source launching assembly (1-1) connects an end of first optical fiber interface (3-1) of Optical Fiber Transmission assembly (3), the other end of the optical fiber interface of optical detection assembly (2-4) connects an end of second optical fiber interface (3-2) of Optical Fiber Transmission assembly (3), one end of first optical fiber interface (3-1) of Optical Fiber Transmission assembly (3) connects the output terminal of the 3rd condenser lens (4-1) of surveying terminal (4), and the other end of second optical fiber interface (3-2) of Optical Fiber Transmission assembly (3) connects the input end of the 4th condenser lens (4-2) of surveying terminal (4).
2. the open circuit type combustible gas detector based on fiber optic conduction according to claim 1 is characterized in that: described light source launching assembly (1) is made up of optical fiber interface (1-1), first condenser lens (1-2), first optical filter (1-3), first amasthenic lens (1-4), first housing (1-5) of light source launching assembly; The left side is equipped with first condenser lens (1-2) of light source launching assembly (1) in first housing (1-5), and the centre is equipped with first optical filter (1-3), and the right side is equipped with first amasthenic lens (1-4); The other end of the optical fiber interface of light source launching assembly (1-1) connects first condenser lens (1-2) of the light source launching assembly (1) in left side in first housing (1-5); Described first housing (1-5) is half elliptic.
3. the open circuit type combustible gas detector based on fiber optic conduction according to claim 1 is characterized in that: described optical detection assembly (2) is made up of optical fiber interface (2-4), second housing (2-5) of second amasthenic lens (2-1), second optical filter (2-2), second condenser lens (2-3), optical detection assembly; The left side is equipped with second amasthenic lens (2-1) in second housing (2-5), and the centre is equipped with second optical filter (2-2), and the right side is equipped with second condenser lens (2-3); The other end of the optical fiber interface of optical detection assembly (2-4) connects second amasthenic lens (2-3) on the interior right side of second housing (2-5); Described second housing (2-5) is half elliptic.
4. the open circuit type combustible gas detector based on fiber optic conduction according to claim 1, it is characterized in that: described Optical Fiber Transmission assembly (3) is made up of first optical fiber interface (3-1) and second optical fiber interface (3-2), optical fiber interface comprises optical fiber, and described optical fiber is the optical cable that has sheath.
5. the open circuit type combustible gas detector based on fiber optic conduction according to claim 1 is characterized in that: described detection terminal (4) is made up of the 3rd condenser lens (4-1), the 4th condenser lens (4-2), infrared transmitter (4-3), the driving circuit that transmits (4-4), signal input circuit (4-5), signal output apparatus (4-6), first infrared remote receiver (4-7), second infrared remote receiver (4-8), signal extraction and amplifying circuit (4-9), signal processing circuit (4-10);
The input end of the 3rd condenser lens (4-1) connects the output terminal of infrared transmitter (4-3), the input end of infrared transmitter (4-3) connects the output terminal of driving circuit (4-4) that transmit, the input end of driving circuit (4-4) of transmitting connects first output terminal of signal processing circuit (4-10), the output terminal of signal input circuit (4-5) connects the first input end of signal processing circuit (4-10), the input end of signal output apparatus (4-6) connects second output terminal of signal processing circuit (4-10), first output terminal of the 4th condenser lens (4-2) connects the input end of first infrared remote receiver (4-7), second output terminal of the 4th condenser lens (4-2) connects the input end of second infrared remote receiver (4-8), the output terminal of first infrared remote receiver (4-7) connects the first input end of signal extraction and amplifying circuit (4-9), the output terminal of second infrared remote receiver (4-8) connects second input end of signal extraction and amplifying circuit (4-9), and the output terminal of signal extraction and amplifying circuit (4-9) connects second input end of signal processing circuit (4-10).
6. detection method that adopts the described open circuit type combustible gas detector based on fiber optic conduction of claim 1 is characterized in that: may further comprise the steps:
Step 1: in the air during no inflammable gas, the first infrared remote receiver receiver gases detecting band infrared signal X1, second infrared remote receiver receives the waveband infrared signal Y1 of reference background, should be worth as standard value and preserve;
Step 2: first infrared remote receiver and second infrared remote receiver constantly receive infrared signal: the waveband infrared signal of the detection of gas that first infrared remote receiver receives is X2, and it is Y2 that second infrared remote receiver receives the waveband infrared signal of reference background;
Step 3: determine to survey increment, formula is as follows:
ΔX＝X2-X1
ΔY＝Y2-Y1
In the formula, Δ X represents the waveband infrared acquisition of signal increment of detection of gas, and Δ Y represents the waveband infrared acquisition of signal increment of reference background, described Δ Y, if Δ Y＞0, the luminous intensity of reduction infrared transmitter, if Δ Y＜0, the luminous intensity of enhancing infrared transmitter;
Step 4: if
Then judge and do not have inflammable gas, execution in step 2 in the air; If Δ Y=0 and Δ X ≠ 0 or
Then judge to have inflammable gas in the air, and calculate combustable gas concentration;
Step 5: report to the police.
7. the detection method of the open circuit type combustible gas detector based on fiber optic conduction according to claim 6 is characterized in that: the first infrared remote receiver receiver gases detecting band infrared signal, and its wavelength coverage is: the 1.55-1.70 micron; 2.2-2.40 micron, the 3.3-3.60 micron.
8. the detection method of a kind of open circuit type combustible gas detector based on fiber optic conduction according to claim 6, it is characterized in that: second infrared remote receiver receives the reference background band signal, span is: the 0.1-1.54 micron, 1.71-2.1 micron, 2.41-3.2 micron, the 3.61-10 micron.
9. the detection method of a kind of open circuit type combustible gas detector based on fiber optic conduction according to claim 6, it is characterized in that: the described C of step 4 is a constant, its span is 100-1000.
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| CN109556155A (en) * | 2017-09-27 | 2019-04-02 | 迪尔阿扣基金两合公司 | Oil smoke detection device and kitchen ventilator for kitchen ventilator |
| CN111398201A (en) * | 2020-06-08 | 2020-07-10 | 翼捷安全设备（昆山）有限公司 | Optical gas detector |
| CN111434973A (en) * | 2019-01-14 | 2020-07-21 | 中昊晨光化工研究院有限公司 | Method for detecting high-risk medium pipeline conveying leakage |
| CN111696690A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Wide-temperature radiation-resistant adjuster for detecting acoustic emission signals of reactor |
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| CN109556155A (en) * | 2017-09-27 | 2019-04-02 | 迪尔阿扣基金两合公司 | Oil smoke detection device and kitchen ventilator for kitchen ventilator |
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| CN111434973A (en) * | 2019-01-14 | 2020-07-21 | 中昊晨光化工研究院有限公司 | Method for detecting high-risk medium pipeline conveying leakage |
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| CN111696690A (en) * | 2020-06-22 | 2020-09-22 | 中国核动力研究设计院 | Wide-temperature radiation-resistant adjuster for detecting acoustic emission signals of reactor |
| CN113655011A (en) * | 2021-10-20 | 2021-11-16 | 武汉新烽光电股份有限公司 | Microfluidic detection system and detection method thereof |
| CN113655011B (en) * | 2021-10-20 | 2022-02-08 | 武汉新烽光电股份有限公司 | Microfluidic detection system and detection method thereof |
| CN116577298A (en) * | 2023-07-07 | 2023-08-11 | 安徽岑锋科技有限公司 | Multi-component high-stability small open-circuit greenhouse gas analyzer |
| CN116577298B (en) * | 2023-07-07 | 2023-10-03 | 安徽岑锋科技有限公司 | Multi-component high-stability small open-circuit greenhouse gas analyzer |
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