CN102287619A - Methane leakage detection device - Google Patents
Methane leakage detection device Download PDFInfo
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- CN102287619A CN102287619A CN2011101353825A CN201110135382A CN102287619A CN 102287619 A CN102287619 A CN 102287619A CN 2011101353825 A CN2011101353825 A CN 2011101353825A CN 201110135382 A CN201110135382 A CN 201110135382A CN 102287619 A CN102287619 A CN 102287619A
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Abstract
The invention provides a methane leakage detection device. The detection device provided by the invention comprises a microprocessor circuit, an oblique wave generating circuit, a sine wave generating circuit, a summator, a laser, a sensor, a phase lock amplifying circuit, a filter circuit and an analog-digital conversion circuit, wherein the phase lock amplifying circuit, the filter circuit and the analog-digital conversion circuit are successively connected; the sensor comprises a laser signal receiver, and the output ends of the oblique wave generating circuit and the sine wave generating circuit are respectively connected with the input end of the summator; the microprocessor circuit is respectively connected with the oblique wave generating circuit and the sine wave generating circuit, and the output end of the summator is connected with the control end of the laser; the laser shot end of the laser is aligned with the laser signal receiver, and the output end of the laser signal receiver is connected with the input end of the phase lock amplifying circuit; and the microprocessor circuit is electrically connected with the reference signal input end of the phase lock amplifying circuit, and the analog-digital conversion circuit is connected with the microprocessor circuit and used for providing the detection data. The detection device provided by the invention has the advantages of high sensitivity, strong anti-interference capability, rapid reaction rate and less danger.
Description
Technical field
The present invention relates to a kind of gas concentration detector device, specifically, related to a kind of methane leak detecting device.
Background technique
Along with the continuous development of national economy, industry, urban construction, resident living are also continuing to increase the combustion gas demand, and the gas safe operation shows significance day by day especially; How strengthening the management to gas safe, accident is taken precautions against in possible trouble, is the matter of utmost importance of gas transmission and distribution pipe network management; But present gas ductwork cruising inspection system need be by manually carrying detector detected gas concentration, and it is huge that it patrols and examines workload, and manual inspection is easily encroached on by toxic gas.
In the prior art, FID is a kind of gas chromatograph detecting instrument to hydrocarbon gas sensitivity, is widely used in volatile hydrocarbon and many detections that contains the charing compound; Traditional FID needs internal pump, and need carry consumptive materials such as carrier gas, though detection speed is faster than manual detection instrument, but still is difficult to satisfy the use needs of fast detecting.
In order to solve the problem of above existence, people are seeking a kind of desirable technical solution always.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, thus provide a kind of highly sensitive, antijamming capability is strong, reaction velocity is fast, dangerous low methane leak detecting device.
To achieve these goals, the technical solution adopted in the present invention is: a kind of methane leak detecting device, it comprises microcontroller circuit, signal generating circuit, laser, sensor, received signal processing circuit, display circuit and power circuit, wherein, described sensor comprises the laser singal receiver; Described signal generating circuit comprises oblique wave generating circuit, sine wave generating circuit and adder, and the output terminal of described oblique wave generating circuit and described sine wave generating circuit is connected the input end of described adder respectively; Described received signal processing circuit comprises phase-locked amplification circuit, eliminator and the analog to digital conversion circuit that connects successively; Described microcontroller circuit connects the input end of described oblique wave generating circuit and described sine wave generating circuit respectively so that signal source to be provided, the output terminal of described adder connects the control end of described laser, and the Laser emission end of described laser is aimed at the input end setting of described laser singal receiver; The testing signal output terminal of described laser singal receiver connects the testing signal input end of described phase-locked amplification circuit, and described microcontroller circuit connects the reference signal input end of described phase-locked amplification circuit so that derived reference signal to be provided; The digital signal output end of analog-digital conversion circuit as described connects described microcontroller circuit so that the detection data to be provided; Described microcontroller circuit connects described display circuit so that output is according to detecting the testing result that draws behind the data operation, and described power circuit connects described microcontroller circuit, described signal generating circuit, described laser, described sensor, described received signal processing circuit and described display circuit respectively so that working power to be provided.
Based on above-mentioned, described sensor also includes generating laser, described generating laser is an optical fiber collimator, the Laser emission end of described laser connects described generating laser by optical fiber, and the Laser emission end of described generating laser is aimed at the input end setting of described laser singal receiver; The generating laser of described sensor and laser singal receiver are installed in the two ends of vehicle-mounted strut respectively.
Based on above-mentioned, described oblique wave generating circuit is a saw-tooth wave generating circuit, described saw-tooth wave generating circuit comprises analog-digital chip U2, resistance R 1, resistance R 2, resistance R 4 and operational amplifier U3, wherein, the analog signal output of described analog-digital chip U2 connects described resistance R 2 one ends, described resistance R 2 the other ends connect the negative pole of described operational amplifier U3, described resistance R 4 one ends connect the positive pole of described operational amplifier U3, described resistance R 4 the other end ground connection, described resistance R 1 two ends are connected negative pole and the output terminal of described operational amplifier U3;
Described sine wave generating circuit comprises triode Q1, capacitor C 1, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12 and operational amplifier U6, wherein, the collector electrode of described triode Q1 connects described resistance R 9 one ends and described resistance R 10 1 ends respectively, the grounded-emitter connection of described triode Q1, described resistance R 9 the other ends are used to connect working power, described resistance R 10 the other ends connect the negative pole of described operational amplifier U6 by described capacitor C 1, described resistance R 11 1 ends connect the negative pole of described operational amplifier U6, described resistance R 12 1 ends connect the positive pole of described operational amplifier U6, the other end of described resistance R 11 and described resistance R 12 is ground connection respectively, and described resistance R 8 two ends are connected negative pole and the output terminal of described operational amplifier U6;
Described adder comprises resistance R 3, resistance R 5, resistance R 6, resistance R 7 and operational amplifier U4, wherein, described resistance R 5 and an end of described resistance R 6 are connected the negative pole of described operational amplifier U4 respectively, described resistance R 7 one ends connect the positive pole of described operational amplifier U4, the other end ground connection of described resistance R 7, described resistance R 3 two ends are connected negative pole and the output terminal of described operational amplifier U4;
The base stage of the digital signal input end of described analog-digital chip U2 and described triode Q1 is respectively applied for and is connected described microcontroller circuit to obtain signal source, the output terminal of described operational amplifier U3 and described operational amplifier U6 is connected the other end of described resistance R 5 and described resistance R 6 respectively, and the output terminal of described operational amplifier U4 is as the output terminal of described adder.
Based on above-mentioned, described phase-locked amplification circuit comprises sine wave two frequency-doubled signal generation circuit that are made of phase-locked loop chip U7, capacitor C 2, resistance R 13, resistance R 14 and trigger U5A and the phase-locked amplification treatment circuit that is made of multiplier U10, resistance R 16 and resistance R 20; Described eliminator comprises capacitor C 3, capacitor C 4, inductance L 1, resistance R 17 and resistance R 18, wherein, described resistance R 17 1 ends connect described resistance R 18 1 ends and described capacitor C 4 one ends respectively, described resistance R 18 the other ends connect described capacitor C 3 one ends, described capacitor C 3 the other ends connect described inductance L 1 one ends, and described inductance L 1 the other end and described capacitor C 4 the other ends are ground connection respectively; Analog-digital conversion circuit as described comprises modulus conversion chip U8;
The testing signal output terminal of described laser singal receiver connects the testing signal input end of described multiplier U10, the input end of described phase-locked loop chip U7 is used to connect described microcontroller circuit to obtain derived reference signal, and the sine wave two frequency-doubled signal output terminals of described phase-locked loop chip U7 connect the reference signal input end of described multiplier U10; The output terminal of described multiplier U10 connects described resistance R 17 the other ends, described resistance R 18 the other ends connect the input end of analog signal of described modulus conversion chip U8, and the digital signal output end of described modulus conversion chip U8 connects described microcontroller circuit so that the detection data to be provided.
Based on above-mentioned, described received signal processing circuit also comprises the signal amplification circuit that is connected between described eliminator and the analog-digital conversion circuit as described, and described signal amplification circuit is made of resistance R 15, resistance R 19 and operational amplifier U9.
Based on above-mentioned, described laser singal receiver comprises resistance R 22, photodiode PD and operational amplifier U11, the positive pole of described photodiode PD and negative pole are connected positive pole and the negative pole of described operational amplifier U11 respectively, described resistance R 22 two ends are connected to negative pole and the output terminal of described operational amplifier U11, and the output terminal of described operational amplifier U11 is as the testing signal output terminal of described laser singal receiver.
The relative prior art of the present invention has outstanding substantive distinguishing features and remarkable progress, specifically, this methane leak detecting device adopts advanced tunable semiconductor laser absorption spectrum technology, it has advantages such as highly sensitive, that antijamming capability is strong, reaction velocity is fast, danger is low, and, it especially is fit to be used in combination with vehicle, it is vehicle fast running on one side, this device that is installed on the vehicle can be finished detection on one side fast, makes reaction time, detection speed, working efficiency be able to perfect optimization.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the electrical block diagram of described signal generating circuit;
Fig. 3 is the electrical block diagram of described received signal processing circuit;
Fig. 4 is the electrical block diagram of described laser singal receiver.
Embodiment
Below by embodiment, technological scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of methane leak detecting device, it comprises microcontroller circuit, signal generating circuit, laser, sensor, received signal processing circuit, display circuit and power circuit, wherein, described sensor comprises the laser singal receiver; Described signal generating circuit comprises oblique wave generating circuit, sine wave generating circuit and adder, and the output terminal of described oblique wave generating circuit and described sine wave generating circuit is connected the input end of described adder respectively; Described received signal processing circuit comprises phase-locked amplification circuit, eliminator and the analog to digital conversion circuit that connects successively; Described microcontroller circuit connects the input end of described oblique wave generating circuit and described sine wave generating circuit respectively so that signal source to be provided, the output terminal of described adder connects the control end of described laser, and the Laser emission end of described laser is aimed at the input end setting of described laser singal receiver; The testing signal output terminal of described laser singal receiver connects the testing signal input end of described phase-locked amplification circuit, and described microcontroller circuit connects the reference signal input end of described phase-locked amplification circuit so that derived reference signal to be provided; The digital signal output end of analog-digital conversion circuit as described connects described microcontroller circuit so that the detection data to be provided; Described microcontroller circuit connects described display circuit so that output is according to detecting the testing result that draws behind the data operation, and described power circuit connects described microcontroller circuit, described signal generating circuit, described laser, described sensor, described received signal processing circuit and described display circuit respectively so that working power to be provided;
Described microcontroller circuit is a known circuits, and its application is very extensive, and in the present embodiment, it adopts the ARM chip; Described laser is a known technology, can buy on the market, and in the present embodiment, its specific wavelength is 1.65um, of particular note, adjusts the specific wavelength of laser, and this device also can be used for the detection of other gas; Described display circuit, described power circuit, described oblique wave generating circuit, described sine wave generating circuit, described adder, described phase-locked amplification circuit, described eliminator and analog-digital conversion circuit as described all are known technologies, in the present invention, mainly in its application.
The basic functional principle of this methane leak detecting device: signal generating circuit produces modulation signal, drive laser, laser singal receives by air and by the laser singal receiver, the laser singal receiver is converted to electrical signal to optical signal, extract second harmonic signal through phase-locked amplification circuit, after wave circuit is handled after filtration again, be converted to digital signal by analog to digital conversion circuit, give microcontroller circuit at last and handle, show the output testing result then; When gas leakage, resonance absorption will take place, its absorption intensity is relevant with the concentration of this gas, just can calculate the concentration of gas by the absorption intensity of measurement light.
This methane leak detecting device adopts advanced tunable semiconductor laser absorption spectrum technology, its principle is as follows: when the absorption wavelength of the emission wavelength of light source and gas matches, resonance absorption will take place, its absorption intensity is relevant with the concentration of this gas, but the concentration of measurement gas just of the absorption intensity by measurement light; It is to utilize the length scanning of semiconductor diode laser and a kind of technology that the electric current tuning characteristic is measured trace gas; Because therefore the high monochromaticity of diode laser can utilize an isolated Absorption Line of gas molecule that the dark line spectrum of gas is measured, thereby can identify different molecules easily from the composite pollution composition, has avoided the interference of spectrum; Laser methane detection technique is according to gas the principle that the bombardment with laser beams selectivity absorbs to be carried out, when certain material is subjected to the laser beam irradiation, this matter selective absorbs the photon of certain frequency, thereby the transmitted intensity that shows as specific wavelength and be 1.65um diminishes, utilize optoelectronic device that transmitted intensity is changed and be converted to electrical signal, can accurately draw methane concentration through calculating.
For further instruction the present invention, provide preferred circuit of the present invention below: as shown in Figure 2, described signal generating circuit comprises oblique wave generating circuit, sine wave generating circuit and adder, and the output terminal of described oblique wave generating circuit and described sine wave generating circuit is connected the input end of described adder respectively; High frequency sinusoidal signal and serrated signal are finished stack by adder, and export to laser;
Described oblique wave generating circuit is a saw-tooth wave generating circuit, described saw-tooth wave generating circuit comprises analog-digital chip U2, resistance R 1, resistance R 2, resistance R 4 and operational amplifier U3, wherein, the analog signal output of described analog-digital chip U2 connects described resistance R 2 one ends, described resistance R 2 the other ends connect the negative pole of described operational amplifier U3, described resistance R 4 one ends connect the positive pole of described operational amplifier U3, described resistance R 4 the other end ground connection, described resistance R 1 two ends are connected negative pole and the output terminal of described operational amplifier U3;
Described sine wave generating circuit comprises triode Q1, capacitor C 1, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12 and operational amplifier U6, wherein, the collector electrode of described triode Q1 connects described resistance R 9 one ends and described resistance R 10 1 ends respectively, the grounded-emitter connection of described triode Q1, described resistance R 9 the other ends are used to connect working power, described resistance R 10 the other ends connect the negative pole of described operational amplifier U6 by described capacitor C 1, described resistance R 11 1 ends connect the negative pole of described operational amplifier U6, described resistance R 12 1 ends connect the positive pole of described operational amplifier U6, the other end of described resistance R 11 and described resistance R 12 is ground connection respectively, and described resistance R 8 two ends are connected negative pole and the output terminal of described operational amplifier U6;
Described adder comprises resistance R 3, resistance R 5, resistance R 6, resistance R 7 and operational amplifier U4, wherein, described resistance R 5 and an end of described resistance R 6 are connected the negative pole of described operational amplifier U4 respectively, described resistance R 7 one ends connect the positive pole of described operational amplifier U4, the other end ground connection of described resistance R 7, described resistance R 3 two ends are connected negative pole and the output terminal of described operational amplifier U4;
The base stage of the digital signal input end of described analog-digital chip U2 and described triode Q1 is respectively applied for and is connected described microcontroller circuit to obtain signal source, the output terminal of described operational amplifier U3 and described operational amplifier U6 is connected the other end of described resistance R 5 and described resistance R 6 respectively, and the output terminal of described operational amplifier U4 is as the output terminal of described adder.
As shown in Figure 3, described received signal processing circuit comprises phase-locked amplification circuit, eliminator, signal amplification circuit and the analog to digital conversion circuit that connects successively;
Described phase-locked amplification circuit comprises sine wave two frequency-doubled signal generation circuit that are made of phase-locked loop chip U7, capacitor C 2, resistance R 13, resistance R 14 and trigger U5A and the phase-locked amplification treatment circuit that is made of multiplier U10, resistance R 16 and resistance R 20;
In sinusoidal wave two frequency-doubled signal generation circuit, because what phase-locked loop chip U7 adopted is RC type voltage controlled oscillator, need external capacitor C2 and resistance R 14 as discharging and recharging element, 9 pin that 13 pin of phase-locked loop chip U7 are connected to it by resistance R 13 are with the input as voltage controlled oscillator, and trigger U5A finishes the function of two divided-frequency;
The effect of described phase-locked amplification circuit is the two frequency-doubled signals taking-up with reflection gas concentration in the electrical signal after the photodiode converts, it is the synchronous coherent detector that utilizes the crosscorrelation principle design, the signal of its output is not the simple amplification of input signal, but testing signal and reference signal have been carried out related operation, AC compounent is amplified and is become corresponding direct current signal output; Because what will extract is sinusoidal wave second harmonic signal, therefore, what reference signal adopted is two sinusoidal wave frequency-doubled signals;
Described eliminator comprises capacitor C 3, capacitor C 4, inductance L 1, resistance R 17 and resistance R 18, wherein, described resistance R 17 1 ends connect described resistance R 18 1 ends and described capacitor C 4 one ends respectively, described resistance R 18 the other ends connect described capacitor C 3 one ends, described capacitor C 3 the other ends connect described inductance L 1 one ends, and described inductance L 1 the other end and described capacitor C 4 the other ends are ground connection respectively;
Described signal amplification circuit is made of resistance R 15, resistance R 19 and operational amplifier U9; Analog-digital conversion circuit as described comprises modulus conversion chip U8;
The testing signal output terminal of described laser singal receiver connects the testing signal input end of described multiplier U10, the input end of described phase-locked loop chip U7 is used to connect described microcontroller circuit to obtain derived reference signal, and the sine wave two frequency-doubled signal output terminals of described phase-locked loop chip U7 connect the reference signal input end of described multiplier U10; The output terminal of described multiplier U10 connects described resistance R 17 the other ends, described resistance R 18 the other ends connect the negative pole of described operational amplifier U9, the output terminal of described operational amplifier U9 connects the input end of analog signal of described modulus conversion chip U8, and the digital signal output end of described modulus conversion chip U8 connects the microprocessor chip U1 of described microcontroller circuit.
As shown in Figure 4, described laser singal receiver comprises resistance R 22, photodiode PD and operational amplifier U11, the positive pole of described photodiode PD and negative pole are connected positive pole and the negative pole of described operational amplifier U11 respectively, described resistance R 22 two ends are connected to negative pole and the output terminal of described operational amplifier U11, and the output terminal of described operational amplifier U11 is as the testing signal output terminal of described laser singal receiver;
The Laser emission that laser sends is in air, after the laser of process air is received by the laser singal receiver again, just comprised the concentration information of gas in the air, photodiode converts through the laser singal receiver, make it to be converted to current signal, because this current signal is very faint, amplifies with operational amplifier again, then can obtain voltage signal at the output terminal of operational amplifier.
1 of present embodiment and embodiment are different mainly to be: described sensor also includes generating laser, and described generating laser is an optical fiber collimator; The Laser emission end of described laser connects described generating laser by optical fiber, and the Laser emission end of described generating laser is aimed at the input end setting of described laser singal receiver; The generating laser of described sensor and laser singal receiver are installed in the two ends of vehicle-mounted strut respectively;
The laser that laser sends is connected on the optical fiber collimator by optical fiber, optical fiber collimator Laser emission in air; The laser that sends from optical fiber collimator is by after the air, the laser that is received by the laser singal receiver has just comprised the concentration information of gas in the air again, photodiode converts through the laser singal receiver, make it to be converted to current signal, because this current signal is very faint, amplify with operational amplifier again, then can obtain voltage signal at the output terminal of operational amplifier.
In the real work, the vehicle-mounted strut that sensor is installed is fixed on front part of vehicle, the remaining circuit of methane leak detecting device is placed in the vehicle as the portable instrument body, and the two is linked to each other with optical fiber by datawire, realizes vehicle-mounted methane leak detecting device with this; This vehicle-mounted methane leak detecting device cooperates with vehicle, fast detecting can be realized, the injury of detected gas can be avoided as far as possible or reduce human body, and during non-detection operation, vehicle-mounted strut can be pulled down, avoid this vehicle-mounted methane leak detecting device to be damaged or stolen.
At present, for places such as gas ductwork, chemical plant, buildings, can only manually carry detector and carry out the gas concentration detection, but the manual inspection workload is big, dangerous, and inefficiency, and vehicle-mounted methane leak detecting device provided by the invention, it can replace manually going on-the-spot test fully, and can be in automobile normal running, carry out the monitoring of gas leakage in real time, speed is fast, and the efficient height is dangerous low; This detection device is a kind of active methane leak detection apparatus, it makes reaction time, detectable concentration, detection speed obtain good optimization control, can in time send acoustooptic alarm, prompting the personnel of patrolling and examining note, so that take further prevention, remedial measure, can avoid the generation of methane leakage accident effectively, economic benefit that it can bring and social benefit will be significant.
This vehicle-mounted methane leak detecting device has following advantage: 1, reaction velocity is fast, and is highly sensitive, is fit to be used with the vehicle of fast running; 2, volume is little, and is in light weight, no electrical spark, safety, anti-electromagnetic interference; 3, efficient height, high selectivity, anti-gas disturbs, and highi degree of accuracy can be monitored in real time, also can provide acoustooptic alarm; 4, can be used for the detection of high low pressure gas transmission and distribution pipe network; 5, system is not with complicated corollary equipment such as pump and flexible pipe; 6, simple to operate, single driving can be finished detection simultaneously; 7, adjust laser, can detect other gas.
Should be noted that at last: above embodiment is only in order to illustrate that technological scheme of the present invention is not intended to limit; Although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characteristics is equal to replacement the specific embodiment of the present invention; And not breaking away from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technological scheme scope that the present invention asks for protection.
Claims (10)
1. methane leak detecting device, it is characterized in that: it comprises microcontroller circuit, signal generating circuit, laser, sensor, received signal processing circuit, display circuit and power circuit, wherein, described sensor comprises the laser singal receiver; Described signal generating circuit comprises oblique wave generating circuit, sine wave generating circuit and adder, and the output terminal of described oblique wave generating circuit and described sine wave generating circuit is connected the input end of described adder respectively; Described received signal processing circuit comprises phase-locked amplification circuit, eliminator and the analog to digital conversion circuit that connects successively; Described microcontroller circuit connects the input end of described oblique wave generating circuit and described sine wave generating circuit respectively so that signal source to be provided, the output terminal of described adder connects the control end of described laser, and the Laser emission end of described laser is aimed at the input end setting of described laser singal receiver; The testing signal output terminal of described laser singal receiver connects the testing signal input end of described phase-locked amplification circuit, and described microcontroller circuit connects the reference signal input end of described phase-locked amplification circuit so that derived reference signal to be provided; The digital signal output end of analog-digital conversion circuit as described connects described microcontroller circuit so that the detection data to be provided; Described microcontroller circuit connects described display circuit so that output is according to detecting the testing result that draws behind the data operation, and described power circuit connects described microcontroller circuit, described signal generating circuit, described laser, described sensor, described received signal processing circuit and described display circuit respectively so that working power to be provided.
2. methane leak detecting device according to claim 1, it is characterized in that: described sensor also includes generating laser, described generating laser is an optical fiber collimator, the Laser emission end of described laser connects described generating laser by optical fiber, and the Laser emission end of described generating laser is aimed at the input end setting of described laser singal receiver.
3. methane leak detecting device according to claim 2 is characterized in that: the generating laser of described sensor and laser singal receiver are installed in the two ends of vehicle-mounted strut respectively.
4. according to claim 1 or 2 or 3 described methane leak detecting devices, it is characterized in that: described oblique wave generating circuit is a saw-tooth wave generating circuit, described saw-tooth wave generating circuit comprises analog-digital chip U2, resistance R 1, resistance R 2, resistance R 4 and operational amplifier U3, wherein, the analog signal output of described analog-digital chip U2 connects described resistance R 2 one ends, described resistance R 2 the other ends connect the negative pole of described operational amplifier U3, described resistance R 4 one ends connect the positive pole of described operational amplifier U3, described resistance R 4 the other end ground connection, described resistance R 1 two ends are connected negative pole and the output terminal of described operational amplifier U3;
Described sine wave generating circuit comprises triode Q1, capacitor C 1, resistance R 8, resistance R 9, resistance R 10, resistance R 11, resistance R 12 and operational amplifier U6, wherein, the collector electrode of described triode Q1 connects described resistance R 9 one ends and described resistance R 10 1 ends respectively, the grounded-emitter connection of described triode Q1, described resistance R 9 the other ends are used to connect working power, described resistance R 10 the other ends connect the negative pole of described operational amplifier U6 by described capacitor C 1, described resistance R 11 1 ends connect the negative pole of described operational amplifier U6, described resistance R 12 1 ends connect the positive pole of described operational amplifier U6, the other end of described resistance R 11 and described resistance R 12 is ground connection respectively, and described resistance R 8 two ends are connected negative pole and the output terminal of described operational amplifier U6;
Described adder comprises resistance R 3, resistance R 5, resistance R 6, resistance R 7 and operational amplifier U4, wherein, described resistance R 5 and an end of described resistance R 6 are connected the negative pole of described operational amplifier U4 respectively, described resistance R 7 one ends connect the positive pole of described operational amplifier U4, the other end ground connection of described resistance R 7, described resistance R 3 two ends are connected negative pole and the output terminal of described operational amplifier U4;
The base stage of the digital signal input end of described analog-digital chip U2 and described triode Q1 is respectively applied for and is connected described microcontroller circuit to obtain signal source, the output terminal of described operational amplifier U3 and described operational amplifier U6 is connected the other end of described resistance R 5 and described resistance R 6 respectively, and the output terminal of described operational amplifier U4 is as the output terminal of described adder.
5. according to claim 1 or 2 or 3 described methane leak detecting devices, it is characterized in that: described phase-locked amplification circuit comprises sine wave two frequency-doubled signal generation circuit that are made of phase-locked loop chip U7, capacitor C 2, resistance R 13, resistance R 14 and trigger U5A and the phase-locked amplification treatment circuit that is made of multiplier U10, resistance R 16 and resistance R 20; Described eliminator comprises capacitor C 3, capacitor C 4, inductance L 1, resistance R 17 and resistance R 18, wherein, described resistance R 17 1 ends connect described resistance R 18 1 ends and described capacitor C 4 one ends respectively, described resistance R 18 the other ends connect described capacitor C 3 one ends, described capacitor C 3 the other ends connect described inductance L 1 one ends, and described inductance L 1 the other end and described capacitor C 4 the other ends are ground connection respectively; Analog-digital conversion circuit as described comprises modulus conversion chip U8;
The testing signal output terminal of described laser singal receiver connects the testing signal input end of described multiplier U10, the input end of described phase-locked loop chip U7 is used to connect described microcontroller circuit to obtain derived reference signal, and the sine wave two frequency-doubled signal output terminals of described phase-locked loop chip U7 connect the reference signal input end of described multiplier U10; The output terminal of described multiplier U10 connects described resistance R 17 the other ends, described resistance R 18 the other ends connect the input end of analog signal of described modulus conversion chip U8, and the digital signal output end of described modulus conversion chip U8 connects described microcontroller circuit so that the detection data to be provided.
6. methane leak detecting device according to claim 4 is characterized in that: described phase-locked amplification circuit comprises sine wave two frequency-doubled signal generation circuit that are made of phase-locked loop chip U7, capacitor C 2, resistance R 13, resistance R 14 and trigger U5A and the phase-locked amplification treatment circuit that is made of multiplier U10, resistance R 16 and resistance R 20; Described eliminator comprises capacitor C 3, capacitor C 4, inductance L 1, resistance R 17 and resistance R 18, wherein, described resistance R 17 1 ends connect described resistance R 18 1 ends and described capacitor C 4 one ends respectively, described resistance R 18 the other ends connect described capacitor C 3 one ends, described capacitor C 3 the other ends connect described inductance L 1 one ends, and described inductance L 1 the other end and described capacitor C 4 the other ends are ground connection respectively; Analog-digital conversion circuit as described comprises modulus conversion chip U8;
The testing signal output terminal of described laser singal receiver connects the testing signal input end of described multiplier U10, the input end of described phase-locked loop chip U7 is used to connect described microcontroller circuit to obtain derived reference signal, and the sine wave two frequency-doubled signal output terminals of described phase-locked loop chip U7 connect the reference signal input end of described multiplier U10; The output terminal of described multiplier U10 connects described resistance R 17 the other ends, described resistance R 18 the other ends connect the input end of analog signal of described modulus conversion chip U8, and the digital signal output end of described modulus conversion chip U8 connects described microcontroller circuit so that the detection data to be provided.
7. methane leak detecting device according to claim 6, it is characterized in that: described received signal processing circuit also comprises the signal amplification circuit that is connected between described eliminator and the analog-digital conversion circuit as described, and described signal amplification circuit is made of resistance R 15, resistance R 19 and operational amplifier U9.
8. according to claim 1 or 2 or 3 described methane leak detecting devices, it is characterized in that: described laser singal receiver comprises resistance R 22, photodiode PD and operational amplifier U11, the positive pole of described photodiode PD and negative pole are connected positive pole and the negative pole of described operational amplifier U11 respectively, described resistance R 22 two ends are connected to negative pole and the output terminal of described operational amplifier U11, and the output terminal of described operational amplifier U11 is as the testing signal output terminal of described laser singal receiver.
9. methane leak detecting device according to claim 4, it is characterized in that: described laser singal receiver comprises resistance R 22, photodiode PD and operational amplifier U11, the positive pole of described photodiode PD and negative pole are connected positive pole and the negative pole of described operational amplifier U11 respectively, described resistance R 22 two ends are connected to negative pole and the output terminal of described operational amplifier U11, and the output terminal of described operational amplifier U11 is as the testing signal output terminal of described laser singal receiver.
10. according to claim 6 or 7 described methane leak detecting devices, it is characterized in that: described laser singal receiver comprises resistance R 22, photodiode PD and operational amplifier U11, the positive pole of described photodiode PD and negative pole are connected positive pole and the negative pole of described operational amplifier U11 respectively, described resistance R 22 two ends are connected to negative pole and the output terminal of described operational amplifier U11, and the output terminal of described operational amplifier U11 is as the testing signal output terminal of described laser singal receiver.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998282A (en) * | 2012-12-21 | 2013-03-27 | 河南汉威电子股份有限公司 | Open circuit laser methane gas detection system |
| CN103017982A (en) * | 2012-12-21 | 2013-04-03 | 河南汉威电子股份有限公司 | Linear toxic gas detection system |
| CN104237898B (en) * | 2014-10-07 | 2017-03-01 | 西南石油大学 | A kind of natural gas leaking remote measuring laser radar |
| CN107906376A (en) * | 2017-11-28 | 2018-04-13 | 黑龙江恒讯科技有限公司 | A kind of optical fiber gas security device based on PON technologies |
| CN108507975A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of acetylene analyzer based on TDLAS technologies |
| CN108507976A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of CO analyzers based on TDLAS technologies |
| CN108535215A (en) * | 2018-04-17 | 2018-09-14 | 广东电网有限责任公司 | A kind of inorganic gas analyzer based on TDLAS technologies |
| CN108571658A (en) * | 2018-08-01 | 2018-09-25 | 无锡麦道电子科技有限公司 | Gas piping ultrasonic leak detector |
| CN114660215A (en) * | 2022-05-25 | 2022-06-24 | 山东科技大学 | FID detection circuit of gas chromatograph |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998282A (en) * | 2012-12-21 | 2013-03-27 | 河南汉威电子股份有限公司 | Open circuit laser methane gas detection system |
| CN103017982A (en) * | 2012-12-21 | 2013-04-03 | 河南汉威电子股份有限公司 | Linear toxic gas detection system |
| CN104237898B (en) * | 2014-10-07 | 2017-03-01 | 西南石油大学 | A kind of natural gas leaking remote measuring laser radar |
| CN107906376A (en) * | 2017-11-28 | 2018-04-13 | 黑龙江恒讯科技有限公司 | A kind of optical fiber gas security device based on PON technologies |
| CN108507975A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of acetylene analyzer based on TDLAS technologies |
| CN108507976A (en) * | 2018-04-17 | 2018-09-07 | 广东电网有限责任公司 | A kind of CO analyzers based on TDLAS technologies |
| CN108535215A (en) * | 2018-04-17 | 2018-09-14 | 广东电网有限责任公司 | A kind of inorganic gas analyzer based on TDLAS technologies |
| CN108571658A (en) * | 2018-08-01 | 2018-09-25 | 无锡麦道电子科技有限公司 | Gas piping ultrasonic leak detector |
| CN114660215A (en) * | 2022-05-25 | 2022-06-24 | 山东科技大学 | FID detection circuit of gas chromatograph |
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