CN103925944A - Airtight spraying room environment monitoring system based on passive wireless sensing technology - Google Patents
Airtight spraying room environment monitoring system based on passive wireless sensing technology Download PDFInfo
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- CN103925944A CN103925944A CN201410145133.8A CN201410145133A CN103925944A CN 103925944 A CN103925944 A CN 103925944A CN 201410145133 A CN201410145133 A CN 201410145133A CN 103925944 A CN103925944 A CN 103925944A
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Abstract
The invention discloses an airtight spraying room environment monitoring system based on a passive wireless sensing technology. The system comprises an upper computer, a primary circuit and a secondary circuit. The secondary circuit is installed on the wall in a spraying room, the primary circuit is installed outside the wall, and PCB inductors on the two circuits are overlapped to the maximum extent when the two circuits are installed. The secondary circuit comprises a temperature MEMS microsensor, a humidity MEMS microsensor and a pressure MEMS microsensor, and the microsensors are used for testing the environment changes inside the spraying room. Carrier waves emitted by the primary circuit are coupled to the secondary circuit through the inductors to supply power to the secondary circuit. The secondary circuit adopts the time division multiplexing technology, microsensor parameters are collected in a segmented mode within one period, the measured signals are used for load modulation on the secondary circuit, and waveforms after being modulated are coupled to the primary circuit through the inductors. The primary circuit can obtain the sensor measurement signals after demodulation. The signals are output to the upper computer, corresponding environment parameters are obtained after the signals are processed, and the parameters are displayed. According to the system, the sensors inside the spraying room and the circuits do not need to be supplied with power through a battery, and the service life is long.
Description
Technical field
The invention discloses a kind ofly for monitoring the system of airtight spray painting room environment, relate in particular to the system of a kind of passive and wireless Multi-parameter sensing commercial measurement spray painting room temperature, humidity and atmospheric pressure value.
Background technology
For the spray painting room of sealing, the temperature in room, humidity and air pressure all can affect the spraying effect of paint.Need the environmental parameter in a kind of environmental monitoring system Real-Time Monitoring spray painting room.The existing more research of environmental monitoring system based on ZigBee technology at present.Although yet Zigbee has networking advantage, whole network needs a plurality of telegons and router, relates to agreement, it develops complicated, and expensive, sensor node is generally used powered battery in addition, and the life-span is shorter.
Summary of the invention
Goal of the invention: for above-mentioned prior art, provide a kind of airtight spray painting room environmental monitoring system based on passive wireless sensor technology, can realize passive and wireless measuring multiple parameters and transmission to temperature, humidity and atmospheric pressure value in airtight spray painting room.
Technical scheme: for solving the problems of the technologies described above, technical scheme of the present invention is: a kind of airtight spray painting room environmental monitoring system based on passive wireless sensor technology, comprise the secondary circuit being arranged in spray painting room, the host computer that is arranged on the main circuit outside spray painting room and connects described main circuit; Described main circuit comprises the first coupling inductance, carrier wave generation module, envelope detection module and filter and amplification module; Described secondary circuit comprises the second coupling inductance, rectifying and voltage-stabilizing module, load-modulate module, time division multiplex module, C-f modular converter and MEMS (micro electro mechanical system (MEMS) technology) capacitance type sensor, and described the second coupling inductance and the first coupling inductance are of coupled connections; Wherein:
Described carrier wave generation module is launched for generation of high frequency carrier and via described the first coupling inductance;
Described the second coupling inductance is used for receiving after described high frequency carrier, sends to rectifying and voltage-stabilizing module and obtains stable 5V voltage;
Condenser type temperature, humidity, the air pressure integrated sensor of described MEMS capacitance type sensor for preparing by CMOS MEMS technique, for detection of the temperature in airtight spray painting room, humidity and air pressure size;
Described C-f modular converter comprises the multi-way switch that connects three sensors, for frequency signal corresponding to the capacitance of described MEMS capacitance type sensor converting to;
Described time division multiplex module is come the multi-way switch of C-f modular converter described in gating, three sensor signals of areal survey within a clock period for generation of control signal;
Described load-modulate module, for according to the frequency signal of described C-f modular converter output, changes the signal amplitude in described the second coupling inductance, and is coupled to described the first coupling inductance;
The signal amplitude that described envelope detection module receives according to described the first coupling inductance, demodulation obtains sensor measurement signal;
Described filter and amplification module is for carrying out described sensor measurement signal to be sent to described host computer after filter and amplification;
Described host computer, for according to the sensor measurement signal after described filter and amplification, calculates and exports temperature, humidity and the atmospheric pressure value of airtight spray painting room.
As preferred version of the present invention, described the first coupling inductance and the second coupling inductance are PCB printed inductor, and two parts PCB printed inductor overlaps.
As preferred version of the present invention, described C-f modular converter comprises six road C-f change-over circuits, is connected to respectively described temperature, humidity, air pressure capacitance type sensor and three fixed capacities; Wherein, each is connected and fixed electric capacity Yi road C-f change-over circuit and is connected capacitance type sensor Yi road C-f change-over circuit and forms three tunnel differential frequency circuits, the output valve fout=fin1-fin2 of described every road differential frequency circuit with corresponding; Wherein fin1 is the output valve that is connected and fixed electric capacity Yi road C-f change-over circuit, and fin2 is for connecting the output valve of capacitance type sensor Yi road C-f change-over circuit.
Beneficial effect: compared with prior art, technical scheme of the present invention has following beneficial effect:
1, with respect to the existing monitoring system of utilizing Zigbee networking, the present invention is easy for installation, safeguards that simply, debugging easily, with low cost, is easy to expansion, has good development prospect.
2, with respect to existing RFID technology, the present invention, without by means of single-chip microcomputer and storer, without coding, does not need synchronous clock, and only, by inductive coupling, sequential control is simple, and workload is little, and cost is low, to quality of voltage, requires low.Effectively saved system resource, complicated control system is become simply, and low in energy consumption, cost is low.
3, utilize load-modulate, by inductive coupling transmission of signal, realized passive and wireless.
4, C-f change-over circuit adopts the difference channel have Schmidt trigger to form, the impact of other factors except environmental factor of can reducing on sensor measurement precision.
5, adopt CMOS MEMS microsensor, be expected to future realize on sheet integrated.Further develop, be expected to realize biological sign monitoring.
Accompanying drawing explanation
Fig. 1 is scheme of installation of the present invention;
Fig. 2 is electrical block diagram;
Fig. 3 is working-flow figure;
Fig. 4 is two-way C-f change-over circuit time division multiplex module connection diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and explained.
As Fig. 1, a kind of airtight spray painting room environmental monitoring system based on passive wireless sensor technology, comprises secondary circuit 1, main circuit 2 and host computer 3.Secondary circuit 1 is arranged in the interior walls of airtight spray painting room, main circuit 2 is arranged on external wall with secondary circuit is overlapping.The output of main circuit 2 connects host computer 3, both can adopt traditional physical connection mode, also can communicate by Zigbee-technology.
As shown in Figure 2, main circuit 2 comprises the first coupling inductance 21, carrier wave generation module 4, envelope detection module 5 and filter and amplification module 6.Secondary circuit 1 comprises the second coupling inductance 11, rectifying and voltage-stabilizing module 7, load-modulate module 8, time division multiplex module 9, C-f modular converter 10 and MEMS capacitance type sensor 11.Wherein, the first coupling inductance 21 and the second coupling inductance 11 are PCB printed inductor, two parts PCB printed inductor overlaps, thereby the second coupling inductance 11 and the first coupling inductance 21 are of coupled connections, and forms energy and signal transmission passage between secondary circuit 1 and main circuit 2.
Wherein, carrier wave occurs 4 and adopts E class A amplifier A to produce high frequency carrier, and launches via the first coupling inductance 21.Active switch in E class A amplifier A is power MOS pipe, by the high-frequency square-wave signal input MOS that oscillator LTC6900 is produced, drives chip UCC27321, obtains the control signal of this metal-oxide-semiconductor, thereby control, produces required high frequency carrier.Secondary circuit receives high frequency carriers by the second coupling inductance 11, carrier energy is coupled in circuit, then by rectifying and voltage-stabilizing module 7, to obtain stable 5V voltage is circuit supply.Rectifying part adopts bridge rectifier chip MB6S, and voltage stabilizing partly adopts the linear voltage stabilization chip TPS71550 of TI.Condenser type temperature, humidity, the air pressure integrated microsensor of MEMS capacitance type sensor 11 for preparing by CMOS MEMS technique, for detection of the temperature in airtight spray painting room, humidity and air pressure size.C-f modular converter 10 comprises the multi-way switch that connects three sensors, for frequency signal corresponding to the capacitance of MEMS capacitance type sensor 11 converting to.C-f modular converter 10 comprises three road C-f change-over circuits, as shown in Figure 4, each road C-f change-over circuit is connected and fixed electric capacity respectively by two 74HC14 Schmidt triggers and sensor forms differential frequency circuit, output fout=fin1-the fin2 of this differential frequency circuit, wherein fin1 is the change-over circuit frequency output valve consisting of fixed capacity and Schmidt trigger, the change-over circuit frequency output valve of fin2 for consisting of sensor capacitance and Schmidt trigger.Adopt differential frequency circuit can reduce the impact on sensor measurement precision of other factors except environmental factor.Time division multiplex module 9 is carried out the multi-way switch of gating C-f modular converter 10 for generation of control signal, three sensor signals of areal survey within a clock period.Time division multiplex module 9 produces low-frequency clock signal by silicon oscillator LTC6900, through two d type flip flop secondary frequency divisions, obtains 01,11,00,10 4 kind of control signal.The analog switch that is TS5A3359 by this control signal gating model, analog switch San road is connected to respectively temperature, humidity, three C-f change-over circuits of air pressure.So, in one-period, just can measure in order three sensor signals.Load-modulate module 8, for according to the frequency signal of C-f modular converter 10 outputs, changes the signal amplitude in the second coupling inductance 11, and is coupled to described the first coupling inductance 21.Be specially, the measuring-signal of C-f modular converter 10, by the COM end output of analog switch TS5A3359, is loaded on the grid of MOS switching tube IRF540, changes load, thereby complete load-modulate by controlling the break-make of metal-oxide-semiconductor.Waveform after modulation is coupled to main circuit by the second coupling inductance 11 again.Envelope detection module 5 is comprised of common detector diode and RC filtering circuit.The signal amplitude that envelope detection module 5 receives according to the first coupling inductance 21, demodulation obtains sensor measurement signal.Filter and amplification module 6 is sent to host computer 3 for sensor measurement signal is carried out after filter and amplification.Host computer 3, for according to the sensor measurement signal after filter and amplification, calculates and exports temperature, humidity and the atmospheric pressure value of airtight spray painting room.
The workflow diagram of whole circuit as shown in Figure 3.The carrier wave generation module 4 of main circuit 2 sends pumping signal, via inductance 21, is coupled in secondary circuit 1 and carries out rectifying and voltage-stabilizing, and after voltage stabilization, secondary circuit is started working; In secondary circuit, time division multiplex module 9 is sent after clock signal by clock generation circuit, produces the logic control signal of multiway analog switch through frequency divider; C-f modular converter 10 completes the capacitance of MEMS microsensor 11 to the conversion of frequency signal; Multiway analog switch is subject to the control gating multi-way switch of logic control signal, within a clock period, and areal survey temperature, humidity, three sensor signals of air pressure; Export sensor measurement signal to MOS switching tube grid control end, the break-make of gauge tap pipe, completes load-modulate; The impedance of circuit changes, and the signal amplitude in the coupling inductance 11 of secondary circuit is changed; Modulated waveform is by being inductively coupled in main circuit 2, and main circuit 2 is by just obtaining sensor measurement signal after demodulation.Export host computer to, obtain after treatment corresponding environmental parameter.
In native system, according to actual needs, only need to do a little and change, just a plurality of primary and secondary circuit can be installed in spray painting room, realize comprehensive monitoring.By increasing frequency divider number and the analog switch on secondary circuit, just can increase number of probes.In native system, main circuit completes carrier transmit and reception, and signal demodulation function.The signal that main circuit sends is both as modulated carrier, also for secondary circuit provides energy.By the inductive coupling between primary and secondary circuit, secondary circuit reception carrier signal and after rectifying and voltage-stabilizing for self provides energy.On secondary circuit, comprise the variation of three different MEMS capacitance type sensor induced environment physical quantitys; By C-f change-over circuit, convert the capacitance signal of sensor to frequency signal; Recycling time-division multiplex technology via a transmission channel control load switch on and off, when circuit load impedance variation, can make the signal amplitude respective change on inductance by the frequency signal of different sensors, carrier signal is completed to load-modulate.By inductive coupling, main circuit receives signal after modulation to carry out exporting host computer to after demodulation and completes sampling analysis, finally exports each monitor value in spray painting room.
While using the airtight spray painting room method of environmental monitoring based on passive wireless sensor technology of the present invention, host computer should be able to be corresponding one by one with the parameter of respective sensor by the signal collecting, thereby obtain the quantification of environmental parameter.
In this monitoring system, the sensor in spray painting room and circuit thereof do not need powered battery, and the life-span is long.Be connected without physical cord with the external world, guaranteed the sealed environment of spray painting room, easy for installation.Can conveniently expand the number of parameters of measurement, only need to increase the gating capabilities of frequency divider number and multi-way switch.Whole system, extendability is strong, and debugging is simple, and low in energy consumption, cost is low.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the airtight spray painting room environmental monitoring system based on passive wireless sensor technology, it is characterized in that: comprise the secondary circuit (1) being arranged in spray painting room, the host computer (3) that is arranged on the main circuit (2) outside spray painting room and connects described main circuit (2); Described main circuit (2) comprises the first coupling inductance (21), carrier wave generation module (4), envelope detection module (5) and filter and amplification module (6); Described secondary circuit (1) comprises the second coupling inductance (11), rectifying and voltage-stabilizing module (7), load-modulate module (8), time division multiplex module (9), C-f modular converter (10) and MEMS capacitance type sensor (11), and described the second coupling inductance (11) is of coupled connections with the first coupling inductance (21); Wherein:
Described carrier wave generation module (4) is launched for generation of high frequency carrier and via described the first coupling inductance (21);
Described the second coupling inductance (11), for receiving after described high frequency carrier, sends to rectifying and voltage-stabilizing module (7) and obtains stable 5V voltage;
Condenser type temperature, humidity, the air pressure integrated sensor of described MEMS capacitance type sensor (11) for preparing by CMOS MEMS technique, for detection of the temperature in airtight spray painting room, humidity and air pressure size;
Described C-f modular converter (10) comprises the multi-way switch that connects three sensors, for frequency signal corresponding to the capacitance of described MEMS capacitance type sensor (11) converting to;
Described time division multiplex module (9) is come the multi-way switch of C-f modular converter (10) described in gating, three sensor signals of areal survey within a clock period for generation of control signal;
Described load-modulate module (8), for according to the frequency signal of described C-f modular converter (10) output, changes the signal amplitude in described the second coupling inductance (11), and is coupled to described the first coupling inductance (21);
The signal amplitude that described envelope detection module (5) receives according to described the first coupling inductance (21), demodulation obtains sensor measurement signal;
Described filter and amplification module (6) is sent to described host computer (3) for described sensor measurement signal is carried out after filter and amplification;
Described host computer (3), for according to the sensor measurement signal after described filter and amplification, calculates and exports temperature, humidity and the atmospheric pressure value of airtight spray painting room.
2. a kind of airtight spray painting room environmental monitoring system based on passive wireless sensor technology according to claim 1, it is characterized in that: described the first coupling inductance (21) and the second coupling inductance (11) are PCB printed inductor, and two parts PCB printed inductor overlaps.
3. a kind of airtight spray painting room environmental monitoring system based on passive wireless sensor technology according to claim 1, it is characterized in that: described C-f modular converter (10) comprises six road C-f change-over circuits, be connected to respectively described temperature, humidity, air pressure capacitance type sensor and three fixed capacities; Wherein, each is connected and fixed electric capacity Yi road C-f change-over circuit and is connected capacitance type sensor Yi road C-f change-over circuit and forms three tunnel differential frequency circuits, the output valve fout=fin1-fin2 of described every road differential frequency circuit with corresponding; Wherein fin1 is the output valve that is connected and fixed electric capacity Yi road C-f change-over circuit, and fin2 is for connecting the output valve of capacitance type sensor Yi road C-f change-over circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410145133.8A CN103925944A (en) | 2014-04-11 | 2014-04-11 | Airtight spraying room environment monitoring system based on passive wireless sensing technology |
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| CN201410145133.8A CN103925944A (en) | 2014-04-11 | 2014-04-11 | Airtight spraying room environment monitoring system based on passive wireless sensing technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105806410A (en) * | 2016-03-31 | 2016-07-27 | 东南大学 | Multipoint pressure-sensor passive wireless measuring circuit |
| CN107063358A (en) * | 2017-06-14 | 2017-08-18 | 东莞市拓福德涂装设备有限公司 | A kind of new-type fully-automatic intelligent monitoring system |
| CN110427005A (en) * | 2019-08-15 | 2019-11-08 | 内蒙古大学 | A kind of spraying monitoring system and its monitoring method based on Android |
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