CN105738956A - Microwave flow detector - Google Patents
Microwave flow detector Download PDFInfo
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- CN105738956A CN105738956A CN201610204265.2A CN201610204265A CN105738956A CN 105738956 A CN105738956 A CN 105738956A CN 201610204265 A CN201610204265 A CN 201610204265A CN 105738956 A CN105738956 A CN 105738956A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
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Abstract
The invention provides a microwave flow detector, which comprises: a microwave sending probe for sending microwave signals and a microwave receiving probe for receiving the microwave signals, wherein the microwave receiving probe comprises a power analysis circuit for converting the received microwave signals into power signals, and judging whether materials are blocked according to the power signals. The microwave flow detector of the invention includes two probes, namely the microwave sending probe and the microwave receiving probe. The microwave receiving probe converts the microwave signal into the power signals through the power analysis circuit, and thus judges whether the materials are blocked or are in a deficiency state according to the strong and weak of the power signals. In addition, because microwave bands are used to perform material detection, the microwave bands are long and have good penetration, and the detection accuracy is high without dust interference.
Description
Technical field
The present invention relates to fields of measurement, particularly relate to a kind of microwave flow detector.
Background technology
Need to transmit various solid material in fields such as petrochemical industry, metallurgy, cement/glass building material industry, electric power, mining, water and sewage disposals, such as chemical fertilizer, coal dust, alumina powder etc., therefore, need the transmission of these solid materials is monitored, when sending out existing problem with box lunch, handle it timely, it is to avoid produce greater loss.
In prior art, microwave detector is generally adopted to detect the mobility status of material.But microwave detector of the prior art can only detect the flow regime equipped with the material in the container of material, blocking is occurred for the material in container and does not have the state of material then to cannot be carried out detection.
Summary of the invention
For drawbacks described above of the prior art, the present invention provides a kind of for solving the problem that microwave detector of the prior art occurs to block and do not have the state of material to cannot be carried out detection for the material in container.
The invention provides a kind of microwave flow detector, including: the microwave for sending microwave signal sends probe and the microwave receiving for receiving described microwave signal is popped one's head in；
Wherein, described microwave receiving probe includes power parser circuitry, and described power parser circuitry is for being converted to power signal by the microwave signal of reception, to judge whether material blocks according to described power signal.
Microwave flow detector provided by the invention, including two probes, respectively microwave sends probe and microwave receiving probe, microwave signal is converted to power signal by power parser circuitry by microwave receiving probe, such that it is able to the power according to power signal judges that material is to occur blocking to be in the state not having material.Further, since adopt microwave band to carry out material detection, the wave band of microwave is long, has good penetrance, is not therefore disturbed by dust, and the accuracy of detection is high.
Accompanying drawing explanation
The structural representation of the microwave flow detector that Fig. 1 provides for the embodiment of the present invention one；
The structural representation of the microwave flow detector that Fig. 2 provides for the embodiment of the present invention two；
The circuit diagram of the frequency displacement parser circuitry that Fig. 3 provides for the embodiment of the present invention three；
The circuit diagram of the power parser circuitry that Fig. 4 provides for the embodiment of the present invention four；
The structural representation of the housing of the microwave flow detector that Fig. 5 provides for the embodiment of the present invention six.
Accompanying drawing labelling:
1-microwave sends probe；2-microwave receiving is popped one's head in；21-power parser circuitry 21；
22-offsets parser circuitry；31-housing；32-end cap；
311-the first opening；322-through hole；312-the second opening；
33-plastic window；221-the first operational amplifier；222-first regulates branch road；
223-filters branch road；224-second regulates branch road；225-exports branch road；
2251-the first diode；2252-light emitting diode；211-signal amplification circuit；
212-power-sensing circuit；2112-the second operational amplifier；2113-the 3rd operational amplifier；
Detailed description of the invention
Embodiment one
The structural representation of the microwave flow detector that Fig. 1 provides for the embodiment of the present invention one, as shown in Figure 1, this microwave flow detector includes: the microwave for sending microwave signal sends probe 1 and the microwave receiving for receiving microwave signal pops one's head in 2, wherein, microwave receiving probe 2 includes power parser circuitry 21, power parser circuitry 21 is for being converted to power signal by the microwave signal of reception, to judge whether material blocks according to power signal.
Concrete, in use, it is preferred that microwave sends probe 1 and microwave receiving probe 2 is oppositely arranged, for instance, it is possible to microwave transmission probe 1 and microwave receiving probe 2 are separately positioned on the both sides of material conveying device.
Microwave sends probe 1 and sends microwave signal, microwave receiving probe 2 then receives this microwave signal in opposite end, if now material blocks, owing to blocking the stop of material, microwave receiving probe 2 cannot receive this microwave signal, and the power signal that namely power parser circuitry 21 is converted to is only small.
If now material conveying device not having material, microwave signal is not past the reflection of material, thus microwave receiving probe 2 can receive microwave and send whole microwave signals that probe 1 sends, the loss of signal may be there is in the microwave signal of certain microwave receiving probe 1 reception compared with sending, with microwave, the microwave signal that probe 1 sends, but when there is blocking with material compared with the power signal of microwave receiving probe 2 reception, it does not have the power signal that during material, power parser circuitry 21 is converted to is higher.
Optionally, the signal that power parser circuitry 21 finally exports can also be able to be analogue signal for digital signal, for example, if the signal of output is digital signal, it is possible to " 0 " signal, the material of representative blocks, when being " 1 " signal, the state not having material of representative.
The microwave flow detector that embodiments of the invention provide, including two probes, respectively microwave sends probe 1 and microwave receiving probe 2, microwave signal is converted to power signal by power parser circuitry 21 by microwave receiving probe 2, such that it is able to the power according to power signal judges that material is to occur blocking to be in the state not having material.Further, since adopt microwave band to carry out material detection, the wave band of microwave is long, has good penetrance, is not therefore disturbed by dust, and the accuracy of detection is high.
Embodiment two
The present embodiment is that above-described embodiment is further remarked additionally, the structural representation of the microwave flow detector that Fig. 2 provides for the embodiment of the present invention two, as shown in Figure 2, microwave receiving probe 2 also includes: skew parser circuitry 22, skew parser circuitry 22 is for being converted to Doppler frequency frequency shift signal by the microwave signal of reception, to judge whether material flows according to Doppler frequency frequency shift signal.
The principle producing Doppler frequency shift is that the wavelength of object radiation produces change because of the relative motion of wave source and receiver, and before the wave source of motion, ripple is compressed, and wavelength becomes shorter, and frequency becomes higher.
Concrete, microwave flow detector is in use, microwave sends probe 1 and sends microwave signal, after microwave signal arrives material, reflection via material, reflex to microwave receiving probe 2, now material is equivalent to a secondary emission source, if material is kept in motion, then there is relative motion between material and microwave receiving probe 2, therefore causing that the wavelength of microwaves that microwave receiving probe 2 receives is compressed or elongates, namely the frequency of the microwave signals that microwave receiving probe 2 receives changes, and namely produces Doppler frequency shift.
Concrete, it is possible to judge whether material flows according to skew parser circuitry, it is, the doppler shifted signal that frequency displacement parser circuitry 22 is converted to is not zero, then illustrate that now material is at constant flow.
It should be understood that, when there is blocking and not having material in material, doppler shifted signal is zero, therefore, occurs blocking again without the state of material to distinguish material, then needs power parser circuitry 21 to judge.
Optionally, power parser circuitry 21 and frequency displacement parser circuitry 22 can work simultaneously.Preferably, it is possible to first frequency displacement parser circuitry 22 works, once detect that doppler shifted signal is zero, then power parser circuitry 21 is opened and is operated, and so can save power consumption cost.Certainly, the present embodiment is simply schematically illustrated, and the sequencing of power parser circuitry 21 and frequency displacement parser circuitry 22 work can be other situations, numerous to list herein.Power parser circuitry 21 and frequency displacement parser circuitry 22 are all connected with detector, the signal of telecommunication that pick-up probe sends respectively.
The microwave flow detector that embodiments of the invention provide, can not only judge that material is to occur blocking to be in the state not having material according to the power of the power signal that power parser circuitry 21 obtains, it is also possible to the doppler shifted signal being converted to by frequency resolution circuit 22 judges whether material flows.
Embodiment three
On the basis of above-described embodiment one and embodiment two, the circuit structure of frequency displacement parser circuitry is specifically further explained explanation by the present embodiment.The circuit diagram of the frequency displacement parser circuitry that Fig. 3 provides for the embodiment of the present invention three, as it is shown on figure 3, frequency displacement parser circuitry includes:
For amplify microwave signal the first operational amplifier 221, for zeroing bias voltage first regulate branch road 222, for filtering high frequency signals filter branch road 223, for regulate the first operational amplifier 221 amplification second regulate branch road 224 and output branch road 225；
Wherein, first regulates branch road 222 and filters branch road 223 parallel connection, concrete, and first regulates branch road 222 includes: the first resistance R1, the second resistance R2 and the three resistance R3 being serially connected；Wherein, the second resistance R2 is variable resistance, one end ground connection of the second resistance R2；
Filter branch road 223 to include: the first inductance L1, the second inductance L2 and the first filter capacitor C1 being serially connected, between the first inductance L1 and the second inductance L2, be also associated with the second filter capacitor C2 of one end ground connection.
First regulates branch road 222 and filters the outfan of branch road 223 and the in-phase input end connection of the first operational amplifier 221, the reverse inter-input-ing ending grounding of the first operational amplifier 221.
First operational amplifier 221 also includes feeder ear, and feeder ear is connected with the both positive and negative polarity of power supply respectively, and power supply can be that the first operational amplifier 221 is powered.
First operational amplifier 221 also includes the first adjustment input S1 and the second and regulates input S2, and the first adjustment input S1 and second regulates and is connected to the second adjustment branch road 224 between input S2.
Concrete, second regulates branch road 224 includes: multiple adjustment resistance units parallel with one another, regulates resistance unit and includes: the toggle switch being serially connected and adjustment resistance.Concrete, each adjustment resistance unit includes a resistance and a toggle switch, and toggle switch is used for regulating whether connected resistance accesses the first operational amplifier 221.According to accessing to the quantity regulating resistance in the first operational amplifier 221 and then the amplification of the first operational amplifier 221 can be regulated.
The outfan of the first operational amplifier 221 is connected with output branch road 225, output branch road 225 includes: the first diode the 2251, the 4th resistance R4, the 5th resistance R5 and the light emitting diode 2252 being serially connected, it is connected to the 3rd filter capacitor C3 of one end ground connection between 4th resistance R4 and the 5th resistance R5, between the 4th resistance R4 and the 5th resistance R5, is also associated with the bleeder resistor R6 of one end ground connection.
Wherein, the first diode 2251 may be used for preventing whole output branch road 225 forward conduction, and whether light emitting diode 2252 can have Flow of Goods and Materials according to being used to refer to.Wherein, bleeder resistor R6 can import the earth by the electric current in circuit when the first diode 2251 is not turned on.
The frequency resolution circuit that embodiments of the invention provide can determine whether Flow of Goods and Materials according to obtaining doppler shifted signal.
Embodiment four is on the basis of above-described embodiment one to embodiment three any embodiment, and the circuit structure of power parser circuitry is specifically further explained explanation by the present embodiment.The circuit diagram of the power parser circuitry that Fig. 4 provides for the embodiment of the present invention four, as shown in Figure 4, power parser circuitry includes: for amplifying the signal amplification circuit 211 of described microwave signal and for detecting the power-sensing circuit 212 of power；
Signal amplification circuit 211 includes: the second operational amplifier 2112 and the 3rd operational amplifier 2113 being serially connected, second operational amplifier 2112 is connected to the in-phase input end of the 3rd operational amplifier 2113 by the 7th resistance R7 and the four electric capacity C4, and the outfan of the 3rd operational amplifier 2113 is connected with power-sensing circuit 212 by the 8th resistance R8.
Concrete, the first feedback resistance R9 of described second operational amplifier 2112 and the inverting input of the second operational amplifier 2112 connect, and the inverting input of described second operational amplifier 2112 is also by the tenth resistance R10 ground connection.The in-phase input end of the second operational amplifier 2112 and the 5th electric capacity C5 connect, and are also associated with the 11st resistance R11 of one end ground connection between the in-phase input end of the 5th electric capacity R5 and the second operational amplifier 2112.
Wherein, the structure of the 2113 of the 3rd operational amplifier is similar with the structure of the second operational amplifier 2112, does not repeat them here.
It addition, the second operational amplifier 2112 and the 3rd operational amplifier 2113 are all connected with power supply, power supply is used for being the second operational amplifier 2112 and the 3rd operational amplifier 2113 is powered.Additionally, in order to avoid the interference of power supply signal, the feeder ear at the second operational amplifier 2112 and the 3rd operational amplifier 2113 is respectively connected with filter capacitor.
Power-sensing circuit 212 includes power detection chip, and the power of the signal that power detection chip exports according to signal amplification circuit 211 judges that material is in occurring the state of blocking to be in the state not having material.
Embodiment five
The present embodiment is further to illustrate on the basis of above-described embodiment.
The outfan of power parser circuitry 21 is connected to the first switch, and the first switch is opened or Guan Bi according to the power signal of power parser circuitry 21 output.Or, it is connected to control chip between power parser circuitry 21 and the first switch, controls first by control chip and switch on or close.
Wherein, first switch can be used to be connected with alarming device, alarming device can be independently of microwave receiving probe 2 exist device or systems, it is possible to but be not limited in computer, led display lamp or alarm any one or multiple.Illustrating with led display lamp, when the power signal of power parser circuitry 21 output represents that blocking occurs material, then the first switch adhesive, led display lamp lights.
Certainly, alarming device can also be arranged on microwave receiving probe 2, and alarming device might not pop one's head in 2 independent of microwave receiving.
Wherein, the first switch can be relay, it is also possible to for diode switch.
The outfan of skew parser circuitry 22 is connected to second switch, and second switch is opened or Guan Bi according to the Doppler frequency frequency shift signal of skew parser circuitry output.Or, it is connected to control chip between skew parser circuitry 22 and second switch, is controlled unlatching or the Guan Bi of second switch by control chip.
Second switch may also used to be connected with the device outside microwave receiving probe.Wherein, second switch can be relay, it is also possible to for diode switch.
Wherein, the first switch and second switch can as microwave receiving pop one's head in 2 with the connection interface of warning device, the connection of instant microwave receiving transducer 2 and other devices so that the versatility of whole microwave receiving probe 2 becomes strong.
Embodiment six
On the basis of above-described embodiment one to embodiment five any embodiment, microwave receiving probe and described microwave send probe and all include the housing 31 for housing circuit board, the structural representation of the housing of the microwave flow detector that Fig. 5 provides for the embodiment of the present invention six, as shown in Figure 5, one end of housing 31 is arranged with the first opening 311, first opening 311 is provided with detachable end 32, end cap 32 1 aspect plays so that the effect of housing 31 closing, still further aspect, owing to end cap 32 is dismountable, therefore the taking-up circuit when circuit malfunctions is facilitated to keep in repair.Circuit board can be the circuit board being equipped with power parser circuitry and skew parser circuitry, and certainly, circuit board can also be equipped with microwave to send the circuit board of the microwave transtation mission circuit in probe.
Optionally, housing 31 is metal material, thereby may be ensured that and uses under the mal-condition that material transmits.
Optionally, end cap 32 can be threadeded with housing 31, it is also possible to is screwed connection.
Optionally, end cap 32 is provided with the salient point (not shown) for increasing friction, thus facilitating the dismounting of end cap 32.
It addition, end cap 32 is additionally provided with the through hole 322 for housing cable, thus instant microwave receiving transducer and external equipment are attached.
Optionally, in order to strengthen the intensity of microwave transparent, the other end of housing 31 offers the second opening 312 for making microwave pass through, simultaneously in order to ensure that microwave receiving probe and microwave send the closure of probe, prevent dust and other impurities from entering, it is preferred that the second opening 312 is provided with plastic window 33, microwave is good for the penetrance of plastic material, so that microwave signal farthest reduces absorption in the process sent and receive.Optionally, plastic window 33 is politef.
Optionally, the other end of housing 31, namely offer one end of the second opening 312, be provided with for fixing ring flange (not shown).By ring flange, microwave receiving probe and/or microwave can be sent probe to fix with the container equipped with material.
In the microwave flow detector that the present embodiment provides, also include the housing for housing circuit board, such that it is able to circuit to be played the effect of protection, and in order to strengthen the intensity of microwave transparent, the other end of housing 31 offers the second opening 312 for making microwave pass through, simultaneously in order to ensure that microwave receiving probe and microwave send the closure of probe, prevent dust and other impurities from entering, second opening 312 is provided with plastic window 33, microwave is good for the penetrance of plastic material, so that microwave signal farthest reduces absorption in the process sent and receive.
Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a microwave flow detector, it is characterised in that including:
Microwave for sending microwave signal sends probe and the microwave receiving for receiving described microwave signal is popped one's head in；
Wherein, described microwave receiving probe includes power parser circuitry, and described power parser circuitry is for being converted to power signal by the microwave signal of reception, to judge whether material blocks according to described power signal.
2. microwave flow detector according to claim 1, it is characterised in that described microwave receiving probe also includes:
Skew parser circuitry, described skew parser circuitry is for being converted to Doppler frequency frequency shift signal by the microwave signal of reception, to judge whether material flows according to described Doppler frequency frequency shift signal.
3. microwave flow detector according to claim 1, it is characterized in that, described skew parser circuitry includes: for amplify described microwave signal the first operational amplifier, for zeroing bias voltage first regulate branch road, for filtering high frequency signals filter branch road, for regulate described first operational amplifier amplification second regulate branch road and output branch road；
Wherein, described first branch road and described filtration branch circuit parallel connection are regulated；
Described first regulates branch road includes: the first resistance, the second resistance and the 3rd resistance being serially connected；Described filtration branch road includes: the first inductance, the second inductance and the first filter capacitor being serially connected, and is also associated with the second filter capacitor of one end ground connection between described first inductance and the second inductance；
Described first adjustment branch road and the outfan of described filtration branch road are connected with the in-phase input end of described first operational amplifier；
The reverse inter-input-ing ending grounding of described first operational amplifier；
Described first operational amplifier also includes the first adjustment input and second and regulates input, and described first adjustment input and described second regulates and is connected to the second adjustment branch road between input；
Described second regulates branch road includes: multiple adjustment resistance units parallel with one another, and described adjustment resistance unit includes: the toggle switch being serially connected and adjustment resistance；
The outfan of described first operational amplifier is connected with described output branch road, and described output branch road includes:
The first diode of being serially connected, the 4th resistance, the 5th resistance and light emitting diode, it is connected to the 3rd filter capacitor of one end ground connection between described 4th resistance and the 5th resistance, between described 4th resistance and the 5th resistance, is also associated with the bleeder resistor of one end ground connection.
4. microwave flow detector according to claim 1, it is characterised in that described power parser circuitry includes: for amplifying the signal amplification circuit of described microwave signal and for detecting the power-sensing circuit of power；
Described signal amplification circuit includes: the second operational amplifier being serially connected and the 3rd operational amplifier, described second operational amplifier is connected to the in-phase input end of described 3rd operational amplifier by the 7th resistance and the 4th electric capacity, and the outfan of described 3rd operational amplifier is connected with described power-sensing circuit by the 8th resistance.
5. microwave flow detector according to claim 1, it is characterized in that, the outfan of described power parser circuitry is connected to the first switch, described first switch is opened or Guan Bi according to the power signal of described power parser circuitry output, the outfan of described skew parser circuitry is connected to second switch, and described second switch is opened or Guan Bi according to the Doppler frequency frequency shift signal that described skew parser circuitry exports.
6. the microwave flow detector according to any one of claim 1-5, it is characterized in that, described microwave receiving probe and described microwave send probe and all include the housing for housing circuit board, and one end of described housing offers the first opening, and described first opening is provided with detachable end.
7. microwave flow detector according to claim 6, it is characterised in that be provided with the salient point for increasing friction on described end cap；
Described end cap is provided with the through hole for housing cable.
8. microwave flow detector according to claim 6, it is characterised in that the other end of described housing offers the second opening for making microwave pass through, and described second opening is provided with plastic window.
9. microwave flow detector according to claim 6, it is characterised in that the other end of described housing is provided with for fixing ring flange.
10. microwave flow detector according to claim 8, it is characterised in that described plastic window is politef.
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| CN201610204265.2A CN105738956B (en) | 2016-04-01 | 2016-04-01 | Microwave flow detector |
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| CN201610204265.2A CN105738956B (en) | 2016-04-01 | 2016-04-01 | Microwave flow detector |
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| CN105738956B CN105738956B (en) | 2017-12-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109969738A (en) * | 2019-03-18 | 2019-07-05 | 北京锐达仪表有限公司 | A kind of material detection device |
| CN111239850A (en) * | 2020-03-12 | 2020-06-05 | 北京农业智能装备技术研究中心 | Device and method for detecting blockage of spray head |
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| CN109969738A (en) * | 2019-03-18 | 2019-07-05 | 北京锐达仪表有限公司 | A kind of material detection device |
| CN111239850A (en) * | 2020-03-12 | 2020-06-05 | 北京农业智能装备技术研究中心 | Device and method for detecting blockage of spray head |
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| CN105738956B (en) | 2017-12-01 |
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