CN105548266A - A wireless natural gas detector based on a notch filter circuit - Google Patents
A wireless natural gas detector based on a notch filter circuit Download PDFInfo
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- CN105548266A CN105548266A CN201510963546.1A CN201510963546A CN105548266A CN 105548266 A CN105548266 A CN 105548266A CN 201510963546 A CN201510963546 A CN 201510963546A CN 105548266 A CN105548266 A CN 105548266A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/028—Circuits therefor
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
Abstract
The invention discloses a wireless natural gas detector based on a notch filter circuit. The detector comprises a microcontroller, a gas sensor, a power source, a display, an alarm, a storage, a wireless receiving circuit, an A/D conversion chip connected to the gas sensor, and a wireless transmitting circuit connected to the A/D conversion chip, wherein the power source, the display, the alarm, the storage and the wireless receiving circuit are separately connected to the microcontroller. The wireless transmitting circuit is connected to the wireless receiving circuit through a wireless network. The detector is characterized in that the notch filter circuit is connected in series between the wireless receiving circuit and the microcontroller. The detector transmits signals through the wireless network and a detecting person can detect whether natural gas leaks or not without the need of coming to a detection site, thus providing safety guarantee for the detecting person. The detector is provided with the notch filter circuit, and the notch filter circuit can filter interference signals in the signals, thus avoiding influences of the interference signals on detecting precision of the detector.
Description
Technical field
The present invention relates to a kind of detector, specifically refer to a kind of wireless natural gas detector based on notch filter circuit.
Background technology
Along with rock gas is more and more universal, people also more and more pay attention to the use safety of natural gas.Present people use portable natural gas detector whether to have leakage to detect natural gas usually, but natural gas itself also exists diffusion rapidly, the features such as easy blast, after micro-natural gas leaks, at wind-force, under the acting in conjunction of the external conditions such as environment temperature, leakage point can expand rapidly, large-area calamity danger district will be formed within the time that the scene of the accident is extremely short, when people use traditional portable natural gas detector to be tested with when natural gas is revealed as testing staff cannot withdraw at short notice, Site Detection personnel are then easily caused to occur poisoning situation.
Summary of the invention
The object of the invention is to overcome traditional natural gas detector to use at Test Field, bring the defect of personal safety hidden danger to testing staff, a kind of wireless natural gas detector based on notch filter circuit is provided.
Object of the present invention is achieved through the following technical solutions: a kind of wireless natural gas detector based on notch filter circuit, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and wireless receiving circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network; In order to better implement the present invention, the present invention is also serially connected with notch filter circuit between wireless receiving circuit and microcontroller.
Further, described notch filter electricity routing amplifier P2, amplifier P1, triode VT5, positive pole is connected with the negative pole of amplifier P2 after diode D6, the electric capacity C9 that negative pole is then connected with the output terminal of amplifier P1 after resistance R13, positive pole is connected with the positive pole of electric capacity C9 after resistance R12 through resistance R11 in turn, the electric capacity C8 that negative pole is then connected with the output terminal of amplifier P1 after diode D5, be serially connected in the resistance R15 between the positive pole of amplifier P2 and output terminal, P pole is connected with the collector of triode VT5, the diode D7 that N pole is then connected with the output terminal of amplifier P1 after resistance R14, and positive pole is connected with the positive pole of amplifier P1, the electric capacity C10 that negative pole is then connected with the base stage of triode VT5 forms, the positive pole of described amplifier P1 is connected with the tie point of resistance R12 with resistance R11, its minus earth, form the output terminal of this notch filter circuit while the emitter of described triode VT5 is connected with the output terminal of amplifier P2 and be connected with microcontroller, the positive pole of described electric capacity C8 then forms the input end of this notch filter circuit and is connected with the signal output part of wireless receiving circuit.
Described radio transmitter by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
Described mixting circuit is by transformer T, triode VT1, triode VT2, one end is connected with the Same Name of Ends of the former limit telefault of transformer T, the other end then meets the resistance R1 of 5V voltage, be serially connected in the resistance R2 between the Same Name of Ends of the former limit telefault of transformer T and the base stage of triode VT1, positive pole is connected with the collector of triode VT1, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1 after inductance L 1, ground connection while N pole is connected with the negative pole of electric capacity C2, the diode D1 that P pole is then connected with the base stage of triode VT1 after electric capacity C1, the resistance R3 be in parallel with inductance L 1, positive pole is connected with the Same Name of Ends of the former limit telefault of transformer T, the electric capacity C3 of minus earth, resistance R4 between the centre tap being serially connected in the positive pole of electric capacity C3 and the secondary inductance coil of transformer T, N pole is connected with the non-same polarity of the secondary inductance coil of transformer T, the diode D2 that P pole is then connected with the base stage of triode VT2, P pole is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the diode D3 that N pole is then connected with the base stage of triode VT2, and one end is connected with the base stage of triode VT2 after resistance R5, the resistance R6 that the other end is then connected with A/D conversion chip forms, the emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T, the base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
Described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, the diode D4 that N pole is connected with the output terminal of amplifier P, P pole is then connected with the grid of field effect transistor MOS, the electric capacity C4 that positive pole is connected with the negative pole of amplifier P, negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms; The positive pole of described amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit; The grounded drain of described field effect transistor MOS; The emitter of described triode VT3 is then connected with radiating circuit.
Described radiating circuit is by triode VT4, the electric capacity C5 that positive pole is connected with the output terminal of amplifier P, negative pole is then connected with the base stage of triode VT4, be serially connected in the resistance R8 between the base stage of triode VT4 and the emitter of triode VT3, be serially connected in the resistance R10 between the collector of triode VT4 and the emitter of triode VT3, the resistance R9 that one end is connected with the base stage of triode VT4, the other end is then connected with the emitter of triode VT4 after inductance L 2, and the electric capacity C7 that positive pole is connected with the emitter of triode VT4, negative pole connects antenna forms; The tie point of described resistance R9 and inductance L 2 connects 12V voltage.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention is transmitted signal by wireless network, and whether testing staff does not need body to face Test Field can to detect and have natural gas to reveal, thus provides safety guarantee to testing staff.
(2) the present invention is transmitted signal by radio transmitter, and it can process signal, makes signal more stable in the process of long range propagation, thus makes the distance of Signal transmissions of the present invention farther.
(3) the present invention is provided with notch filter circuit, and this notch filter circuit can filter out the undesired signal in signal, avoids interference effect of signals accuracy of detection of the present invention.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the structural representation of radio transmitter of the present invention.
Fig. 3 is the structural representation of notch filter circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, wireless natural gas detector based on notch filter circuit of the present invention, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and notch filter circuit, the wireless receiving circuit be connected with notch filter circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network.
Wherein, the MD61 type sensor of natural gas that gas sensor adopts Shanghai Mei Si Electronic Science and Technology Co., Ltd. to produce, the sensor of natural gas of this model is highly sensitive, the life-span is long, with low cost.The simulating signal that this A/D conversion chip is used for gas sensor exports is converted to digital electric signal, it preferentially adopts ADC0809 type A/D conversion chip, the EOC pin of this ADC0809 type A/D conversion chip is connected with the output terminal of gas sensor, and its ALE pin is then connected with the signal input part of radio transmitter.This radio transmitter is used for carrying out process afterwards and send to wireless receiving circuit by wireless network to the digital electric signal that A/D conversion chip exports.As shown in Figure 2, this radio transmitter by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
Wherein, described mixting circuit is by transformer T, and triode VT1, triode VT2, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, inductance L 1, electric capacity C1, electric capacity C2, electric capacity C3, diode D1, diode D2 and diode D3 form.
During connection, one end of resistance R1 is connected with the Same Name of Ends of the former limit telefault of transformer T, its other end then connects 5V voltage.Between the Same Name of Ends that resistance R2 is serially connected in the former limit telefault of transformer T and the base stage of triode VT1.The positive pole of electric capacity C2 is connected with the collector of triode VT1, its negative pole is then connected with the base stage of triode VT1 after inductance L 1.While the N pole of diode D1 is connected with the negative pole of electric capacity C2, ground connection, its P pole are then connected with the negative pole of electric capacity C1.The positive pole of described electric capacity C1 is then connected with the base stage of triode VT1.Resistance R3 and inductance L 1 are in parallel.The positive pole of electric capacity C3 is connected with the Same Name of Ends of the former limit telefault of transformer T, its minus earth.Resistance R4 is serially connected between the centre tap of the positive pole of electric capacity C3 and the secondary inductance coil of transformer T.The N pole of diode D2 is connected with the non-same polarity of the secondary inductance coil of transformer T, its P pole is then connected with the base stage of triode VT2.The P pole of diode D3 is connected with the Same Name of Ends of the secondary inductance coil of transformer T, its N pole is then connected with the base stage of triode VT2.The signal input part that one end of resistance R6 is connected with the base stage of triode VT2 after resistance R5, its other end then forms this mixting circuit is also connected with the ALE pin of ADC0809 type A/D conversion chip.The emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T.The base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
In said structure, electric capacity C1, diode D1, electric capacity C2 and triode VT1 forms oscillatory circuit, it can produce a local oscillation signal, after the digital electric signal of A/D conversion chip output is come in from the signal input part input of this mixting circuit, mixting circuit carries out mixing digital electric signal and its local oscillation signal, and exports radiofrequency signal to common emitter amplifying circuit.
Described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, the diode D4 that N pole is connected with the output terminal of amplifier P, P pole is then connected with the grid of field effect transistor MOS, the electric capacity C4 that positive pole is connected with the negative pole of amplifier P, negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms.
The positive pole of this amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit.The grounded drain of described field effect transistor MOS.The emitter of described triode VT3 is then connected with radiating circuit.
The radiofrequency signal exported from mixting circuit carries out inputting radiating circuit after distortionless amplification through common emitter amplifying circuit, and radiofrequency signal is after treatment more stable.
Described radiating circuit is by triode VT4, and resistance R8, resistance R9, resistance R10, inductance L 2, electric capacity C5 and electric capacity C7 forms.During connection, the positive pole of electric capacity C5 is connected with the output terminal of amplifier P, its negative pole is then connected with the base stage of triode VT4.Resistance R8 is serially connected between the base stage of triode VT4 and the emitter of triode VT3.Resistance R10 is serially connected between the collector of triode VT4 and the emitter of triode VT3.One end of resistance R9 is connected with the base stage of triode VT4, its other end is then connected with the emitter of triode VT4 after inductance L 2.The electric capacity C7 that positive pole is connected with the emitter of triode VT4, negative pole connects antenna forms.The tie point of described resistance R9 and inductance L 2 connects 12V voltage.This radiofrequency signal sends to wireless receiving circuit by radiating circuit by wireless network.
In addition, wireless receiving circuit is for receiving the radiofrequency signal of radio transmitter transmission.Notch filter circuit can filter out the undesired signal in signal, avoids interference effect of signals accuracy of detection of the present invention.As shown in Figure 3, this notch filter electricity routing amplifier P2, amplifier P1, triode VT5, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, electric capacity C8, electric capacity C9, electric capacity C10, diode D5, diode D6 and diode D7 form.
During connection, the positive pole of electric capacity C9 is connected with the P pole of diode D6, its negative pole is then connected with the output terminal of amplifier P1 after resistance R13.The N pole of described diode D6 is connected with the negative pole of amplifier P2.The positive pole of electric capacity C8 is connected with the positive pole of electric capacity C9 after resistance R12 through resistance R11 in turn, its negative pole is then connected with the P pole of diode D5.The N pole of described diode D5 is then connected with the output terminal of amplifier P1.Between the positive pole that resistance R15 is serially connected in amplifier P2 and output terminal.The P pole of diode D7 is connected with the collector of triode VT5, its N pole is then connected with the output terminal of amplifier P1 after resistance R14.The positive pole of electric capacity C10 is connected with the positive pole of amplifier P1, its negative pole is then connected with the base stage of triode VT5.The positive pole of described amplifier P1 is connected with the tie point of resistance R12 with resistance R11, its minus earth.Form the output terminal of this notch filter circuit while the emitter of described triode VT5 is connected with the output terminal of amplifier P2 and be connected with microcontroller.The positive pole of described electric capacity C8 then forms the input end of this notch filter circuit and is connected with the signal output part of wireless receiving circuit.When signal input come in after by notch filter circuit, the undesired signal in signal is filtered, this notch filter circuit then export clearly digital electric signal to microcontroller.
Microcontroller is then as control center of the present invention, it preferentially adopts MAX716 type micro-chip processor, and the B1 pin of this MAX716 type micro-chip processor is connected with the output terminal of notch filter circuit, and its UCC pin connects power supply, its B7 pin connects display, and B5 pin is device taking alarm then.This power supply is used for providing working power to microcontroller, and display is then for showing the concentration value of natural gas, and alarm is then for sounding the alarm when having detected that natural gas is revealed, and this reservoir is then for storing the concentration value of natural gas.This wireless receiving circuit uses prior art to realize.
During work, if natural gas is not revealed, the present invention then can not send alerting signal.When there being natural gas to reveal, gas sensor detects in air and has inflammable gas, the conductivity of gas sensor increases with the increase of combustable gas concentration in air, and gas sensor is converted to the simulating signal corresponding with this combustable gas concentration the change of conductivity and exports to A/D change-over circuit simultaneously.This A/D change-over circuit sends through radio transmitter after simulating signal is converted to digital electric signal.This radio transmitter sends to wireless receiving circuit by wireless network after processing digital electric signal, wireless receiving circuit then sends to notch filter circuit digital electric signal, and notch filter circuit sends to microcontroller after the undesired signal be entrained in digital electric signal is filtered.The digital electric signal of microcontroller to input identifies and sends to display, reservoir and alarm respectively after being converted to natural gas concentration signal, this display demonstrates combustable gas concentration value, reservoir then stores this natural gas concentration value, and alarm sounds the alarm simultaneously.
As mentioned above, just well the present invention can be realized.
Claims (6)
1. the wireless natural gas detector based on notch filter circuit, primarily of microcontroller, gas sensor, the power supply be connected with microcontroller respectively, display, alarm, reservoir and wireless receiving circuit, the A/D conversion chip be connected with gas sensor, and the radio transmitter be connected with A/D conversion chip forms; Described radio transmitter is connected with wireless receiving circuit by wireless network; It is characterized in that, between wireless receiving circuit and microcontroller, be also serially connected with notch filter circuit.
2. a kind of wireless natural gas detector based on notch filter circuit according to claim 1, it is characterized in that: described notch filter electricity routing amplifier P2, amplifier P1, triode VT5, positive pole is connected with the negative pole of amplifier P2 after diode D6, the electric capacity C9 that negative pole is then connected with the output terminal of amplifier P1 after resistance R13, positive pole is connected with the positive pole of electric capacity C9 after resistance R12 through resistance R11 in turn, the electric capacity C8 that negative pole is then connected with the output terminal of amplifier P1 after diode D5, be serially connected in the resistance R15 between the positive pole of amplifier P2 and output terminal, P pole is connected with the collector of triode VT5, the diode D7 that N pole is then connected with the output terminal of amplifier P1 after resistance R14, and positive pole is connected with the positive pole of amplifier P1, the electric capacity C10 that negative pole is then connected with the base stage of triode VT5 forms, the positive pole of described amplifier P1 is connected with the tie point of resistance R12 with resistance R11, its minus earth, form the output terminal of this notch filter circuit while the emitter of described triode VT5 is connected with the output terminal of amplifier P2 and be connected with microcontroller, the positive pole of described electric capacity C8 then forms the input end of this notch filter circuit and is connected with the signal output part of wireless receiving circuit.
3. a kind of wireless natural gas detector based on notch filter circuit according to claim 1, it is characterized in that: described radio transmitter is by mixting circuit, the common emitter amplifying circuit be connected with mixting circuit, and the radiating circuit be connected with common emitter amplifying circuit forms.
4. a kind of wireless natural gas detector based on notch filter circuit according to claim 3, it is characterized in that: described mixting circuit is by transformer T, triode VT1, triode VT2, one end is connected with the Same Name of Ends of the former limit telefault of transformer T, the other end then meets the resistance R1 of 5V voltage, be serially connected in the resistance R2 between the Same Name of Ends of the former limit telefault of transformer T and the base stage of triode VT1, positive pole is connected with the collector of triode VT1, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1 after inductance L 1, ground connection while N pole is connected with the negative pole of electric capacity C2, the diode D1 that P pole is then connected with the base stage of triode VT1 after electric capacity C1, the resistance R3 be in parallel with inductance L 1, positive pole is connected with the Same Name of Ends of the former limit telefault of transformer T, the electric capacity C3 of minus earth, resistance R4 between the centre tap being serially connected in the positive pole of electric capacity C3 and the secondary inductance coil of transformer T, N pole is connected with the non-same polarity of the secondary inductance coil of transformer T, the diode D2 that P pole is then connected with the base stage of triode VT2, P pole is connected with the Same Name of Ends of the secondary inductance coil of transformer T, the diode D3 that N pole is then connected with the base stage of triode VT2, and one end is connected with the base stage of triode VT2 after resistance R5, the resistance R6 that the other end is then connected with A/D conversion chip forms, the emitter of described triode VT1 is connected with the non-same polarity of the former limit telefault of transformer T, the base stage of described triode VT2 is all connected with common emitter amplifying circuit with collector, and its emitter is then connected with the positive pole of electric capacity C3.
5. a kind of wireless natural gas detector based on notch filter circuit according to claim 4, it is characterized in that: described common emitter amplifying circuit is by amplifier P, triode VT3, field effect transistor MOS, be serially connected in the resistance R7 between the output terminal of amplifier P and the base stage of triode VT3, N pole is connected with the output terminal of amplifier P, the diode D4 that P pole is then connected with the grid of field effect transistor MOS, positive pole is connected with the negative pole of amplifier P, the electric capacity C4 that negative pole is then connected with the P pole of diode D4, and positive pole is connected with the collector of triode VT3, the electric capacity C6 of minus earth forms, the positive pole of described amplifier P is connected with the base stage of triode VT2, and its negative pole is then connected with the source electrode of field effect transistor MOS, its output terminal then with while triode VT2 collector be connected with radiating circuit, the grounded drain of described field effect transistor MOS, the emitter of described triode VT3 is then connected with radiating circuit.
6. a kind of wireless natural gas detector based on notch filter circuit according to claim 5, it is characterized in that: described radiating circuit is by triode VT4, positive pole is connected with the output terminal of amplifier P, the electric capacity C5 that negative pole is then connected with the base stage of triode VT4, be serially connected in the resistance R8 between the base stage of triode VT4 and the emitter of triode VT3, be serially connected in the resistance R10 between the collector of triode VT4 and the emitter of triode VT3, one end is connected with the base stage of triode VT4, the resistance R9 that the other end is then connected with the emitter of triode VT4 after inductance L 2, and positive pole is connected with the emitter of triode VT4, the electric capacity C7 that negative pole connects antenna forms, the tie point of described resistance R9 and inductance L 2 connects 12V voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510963546.1A CN105548266A (en) | 2015-12-19 | 2015-12-19 | A wireless natural gas detector based on a notch filter circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510963546.1A CN105548266A (en) | 2015-12-19 | 2015-12-19 | A wireless natural gas detector based on a notch filter circuit |
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| CN105548266A true CN105548266A (en) | 2016-05-04 |
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| CA2396417A1 (en) * | 2001-10-23 | 2003-04-23 | Ncr Corporation | Methods and apparatus for a spread spectrum modulated backscatter electronic shelf label system |
| CN102386941A (en) * | 2010-09-06 | 2012-03-21 | 朱丽萍 | Data transmission method, pipeline monitoring method, RF transceiver and system |
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