CN105738956B - Microwave flow detector - Google Patents
Microwave flow detector Download PDFInfo
- Publication number
- CN105738956B CN105738956B CN201610204265.2A CN201610204265A CN105738956B CN 105738956 B CN105738956 B CN 105738956B CN 201610204265 A CN201610204265 A CN 201610204265A CN 105738956 B CN105738956 B CN 105738956B
- Authority
- CN
- China
- Prior art keywords
- microwave
- power
- signal
- branch road
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The present invention provides a kind of microwave flow detector, including：Microwave for sending microwave signal sends probe and the microwave receiving for receiving the microwave signal is popped one's head in；Wherein, the microwave receiving probe includes power parser circuitry, and the power parser circuitry is used to the microwave signal of reception being converted to power signal, to judge whether material blocks according to the power signal.The microwave flow detector of the present invention, including two probes, respectively microwave sends probe and microwave receiving probe, microwave signal is converted to power signal by microwave receiving probe by power parser circuitry, so as to judge that material is to occur to block the state for being in no material according to the power of power signal.Further, since carrying out material detection using microwave band, the wave band length of microwave, there is good penetrability, therefore do not disturbed by dust, the accuracy of detection is high.
Description
Technical field
The present invention relates to fields of measurement, more particularly to a kind of microwave flow detector.
Background technology
Need to pass in fields such as petrochemical industry, metallurgy, cement/glass building material industry, electric power, mining, water and sewage disposals
Various solid materials, such as chemical fertilizer, coal dust, alumina powder etc. are sent, therefore, it is necessary to the transmission to these solid materials is supervised
Depending on when sending out existing problem, timely to handle it, avoiding producing greater loss.
In the prior art, generally use microwave detector detects the mobility status of material.It is but of the prior art micro-
Wave detector can only detect the flow regime of the material in the container equipped with material, and occur to block for the material in container and
The state for not having material can not then be detected.
The content of the invention
For drawbacks described above of the prior art, the present invention provides a kind of for solving microwave detector of the prior art
The problem of can not being detected for the material generation blocking in container and the state of no material.
The invention provides a kind of microwave flow detector, including：For send microwave signal microwave send probe and
Microwave receiving for receiving the microwave signal is popped one's head in；
Wherein, the microwave receiving probe includes power parser circuitry, and the power parser circuitry is used for the micro- of reception
Ripple signal is converted to power signal, to judge whether material blocks according to the power signal.
Microwave flow detector provided by the invention, including two probes, respectively microwave send probe and microwave receiving
Probe, microwave signal is converted to power signal by microwave receiving probe by power parser circuitry, so as to be believed according to power
Number power judge that material is that blocking occurs to be in the state of no material.Further, since thing is carried out using microwave band
Material detection, the wave band length of microwave, has good penetrability, therefore is not disturbed by dust, and the accuracy of detection is high.
Brief description of the drawings
Fig. 1 is the structural representation for the microwave flow detector that the embodiment of the present invention one provides；
Fig. 2 is the structural representation for the microwave flow detector that the embodiment of the present invention two provides；
Fig. 3 is the circuit diagram for the frequency displacement parser circuitry that the embodiment of the present invention three provides；
Fig. 4 is the circuit diagram for the power parser circuitry that the embodiment of the present invention four provides；
Fig. 5 is the structural representation of the housing for the microwave flow detector that the embodiment of the present invention six provides.
Reference：
1- microwaves send probe；2- microwave receivings are popped one's head in；21- power parser circuitry 21；
22- frequency displacement parser circuitries；31- housings；32- end caps；
311- first is open；322- through holes；312- second is open；
33- plastic windows；The operational amplifiers of 221- first；222- first adjusts branch road；
223- filters branch road；224- second adjusts branch road；225- exports branch road；
The diodes of 2251- first；2252- light emitting diodes；211- signal amplification circuits；
212- power-sensing circuits；The operational amplifiers of the second operation amplifiers of 2112- 2113- the 3rd；Device；
Embodiment
Embodiment one
Fig. 1 is the structural representation for the microwave flow detector that the embodiment of the present invention one provides, as shown in figure 1, the microwave
Flow probe includes：Microwave for sending microwave signal sends probe 1 and the microwave receiving for receiving microwave signal is visited
First 2, wherein, microwave receiving probe 2 includes power parser circuitry 21, and power parser circuitry 21 is used to turn the microwave signal of reception
Power signal is changed to, to judge whether material blocks according to power signal.
Specifically, when in use, it is preferred that microwave sends probe 1 and microwave receiving probe 2 is oppositely arranged, for example, can be with
Microwave is sent into probe 1 and microwave receiving probe 2 is separately positioned on the both sides of material conveying device.
Microwave sends probe 1 and sends microwave signal, and microwave receiving probe 2 then receives the microwave signal in opposite end, if now
Material blocks, and due to blocking the stop of material, microwave receiving probe 2 can not receive the microwave signal, i.e. power parsing electricity
The power signal very little that road 21 is converted to.
If not having material in material conveying device now, microwave signal does not pass through the reflection of material, thus microwave receiving
Probe 2 can receive microwave and send whole microwave signals that probe 1 is sent, the microwave signal that certain microwave receiving probe 1 receives
Microwave when may have the loss of signal compared with microwave sends 1 microwave signal sent of popping one's head in, but be blocked with material
The power signal that receiving transducer 2 receives is compared, and the power signal that power parser circuitry 21 is converted to during no material is stronger.
Optionally, the signal of the final output of power parser circuitry 21 can be that data signal can also be analog signal, lift
Example for, if output signal be data signal, can " 0 " signal, the material of representative blocks, when being " 1 " signal, generation
The state without material of table.
The microwave flow detector that embodiments of the invention provide, including two probes, respectively microwave send 1 He of probe
Microwave signal is converted to power signal by microwave receiving probe 2, microwave receiving probe 2 by power parser circuitry 21, so as to
To judge that material is to occur to block the state for being in no material according to the power of power signal.Further, since using micro-
Ripple wave band carries out material detection, the wave band length of microwave, has good penetrability, therefore do not disturbed by dust, detection it is accurate
Property it is high.
Embodiment two
The present embodiment is to the further supplementary notes of above-described embodiment, and Fig. 2 is the microwave that the embodiment of the present invention two provides
The structural representation of flow probe, as shown in Fig. 2 microwave receiving probe 2 also includes：Frequency displacement parser circuitry 22, frequency displacement parsing
Circuit 22 is used to the microwave signal of reception being converted to Doppler frequency frequency shift signal, to be sentenced according to Doppler frequency frequency shift signal
Whether disconnected material flows.
The principle for producing Doppler frequency shift is that the wavelength of object radiation produces because of the relative motion of wave source and recipient
Change, before the wave source of motion, ripple is compressed, and wavelength becomes shorter, and frequency becomes higher.
Specifically, microwave flow detector is when in use, microwave sends probe 1 and sends microwave signal, and microwave signal reaches
After material, via the reflection of material, microwave receiving probe 2 is reflexed to, now equivalent to one secondary emission source of material, if material
It is kept in motion, then relative motion is present between material and microwave receiving probe 2, therefore microwave receiving probe 2 can be caused to connect
The wavelength of the microwave received is compressed or elongated, that is, the frequency of microwave signals that microwave receiving probe 2 receives occurs
Change, that is, produce Doppler frequency shift.
Specifically, it can judge whether material flows according to frequency displacement parser circuitry, it is, frequency displacement parser circuitry 22 is changed
Obtained doppler shifted signal is not zero, then illustrates that now material is in constant flow.
It should be understood that material, in the state of generation blocking and without material, doppler shifted signal is
Zero, therefore, occur to block the state again without material to material to be distinguished, then need power parser circuitry 21 to be sentenced
It is disconnected.
Optionally, power parser circuitry 21 and frequency displacement parser circuitry 22 can work simultaneously.Preferably, can frequency displacement first
Parser circuitry 22 is worked, and when it is zero to detect doppler shifted signal, then power parser circuitry 21 is opened and is operated, this
Sample can save power consumption cost.Certainly, the present embodiment is simply schematically illustrated, power parser circuitry 21 and frequency displacement parsing
The sequencing that circuit 22 works can be other situations, numerous to list herein.Power parser circuitry 21 and frequency displacement parsing electricity
Road 22 is connected with detector, the electric signal that pick-up probe is sent respectively.
The microwave flow detector that embodiments of the invention provide, the work(that can not only be obtained according to power parser circuitry 21
The power of rate signal judges that material is to occur to block the state for being in no material, can also pass through frequency resolution circuit 22
The doppler shifted signal being converted to judges whether material flows.
Embodiment three
On the basis of above-described embodiment one and embodiment two, the present embodiment is specifically to the circuit structure of frequency displacement parser circuitry
Explanation is further explained.The circuit diagram for the frequency displacement parser circuitry that Fig. 3 provides for the embodiment of the present invention three, such as Fig. 3
Shown, frequency displacement parser circuitry includes：
For amplifying the first operational amplifier 221 of microwave signal, the first regulation branch for adjusting zero offset voltage
Road 222, the filtering branch road 223 for filtering high frequency signals, the second tune for adjusting the multiplication factor of the first operational amplifier 221
Save branch road 224 and output branch road 225；
Wherein, the first regulation branch road 222 and filtering branch road 223 are in parallel, specifically, the first regulation branch road 222 includes：Mutually
First resistor R1, second resistance R2 and the 3rd resistor R3 of series connection；Wherein, second resistance R2 is variable resistor, second resistance R2
One end ground connection；
Filtering branch road 223 includes：The the first inductance L1, the second inductance L2 that are serially connected and the first filter capacitor C1, first
The second filter capacitor C2 of one end ground connection is also associated between inductance L1 and the second inductance L2.
The output end of first regulation branch road 222 and filtering branch road 223 and the in-phase input end of the first operational amplifier 221 connect
Connect, 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
First operational amplifier 221 is powered.
First operational amplifier 221 also includes the first regulation input S1 and the second regulation input S2, and the first regulation is defeated
Enter to hold S1 and second to be connected with the second regulation branch road 224 between adjusting input S2.
Specifically, the second regulation branch road 224 includes：Multiple regulation resistance units parallel with one another, regulation resistance unit bag
Include：The toggle switch and regulation resistance being serially connected.Specifically, each regulation resistance unit includes a resistance and a dial-up
Switch, toggle switch are used to adjust whether connected resistance accesses the first operational amplifier 221.Can be according to accessing to
The quantity of regulation resistance and then the multiplication factor of the first operational amplifier 221 of regulation in one operational amplifier 221.
The output end of first operational amplifier 221 is connected with output branch road 225, and output branch road 225 includes：It is serially connected
First diode 2251, the 4th resistance R4, the 5th resistance R5 and light emitting diode 2252, the 4th resistance R4 and the 5th resistance R5 it
Between be connected with one end ground connection the 3rd filter capacitor C3, be also associated between the 4th resistance R4 and the 5th resistance R5 one end ground connection
Bleeder resistor R6.
Wherein, the first diode 2251 can be used for preventing from entirely exporting the forward conduction of branch road 225, light emitting diode 2252
Can be according to being used to refer to whether have Flow of Goods and Materials.Wherein, bleeder resistor R6 can be when the first diode 2251 be not turned on
Electric current in circuit imports the earth.
The frequency resolution circuit that embodiments of the invention provide can determine whether according to doppler shifted signal is obtained
Flow of Goods and Materials.
Example IV is on the basis of above-described embodiment one to any embodiment of embodiment three, and the present embodiment is specifically to power
Explanation is further explained in the circuit structure of parser circuitry.Fig. 4 is the power parser circuitry that the embodiment of the present invention four provides
Circuit diagram, as shown in figure 4, power parser circuitry includes：For amplifying the signal amplification circuit 211 of the microwave signal
With the power-sensing circuit 212 for detecting power；
Signal amplification circuit 211 includes：The second operational amplifier 2112 being serially connected and the 3rd operational amplifier 2113,
Second operational amplifier 2112 is connected to the same mutually defeated of the 3rd operational amplifier 2113 by the 7th resistance R7 and the 4th electric capacity C4
Enter end, the output end of the 3rd operational amplifier 2113 is connected by the 8th resistance R8 with power-sensing circuit 212.
Specifically, the first feedback resistance R9 of second operational amplifier 2112 and the second operational amplifier 2112 is anti-
Phase input is connected, and the inverting input of second operational amplifier 2112 is also grounded by the tenth resistance R10.Second computing
The in-phase input end of amplifier 2112 is connected with the 5th electric capacity C5, the 5th electric capacity R5 and the second operational amplifier 2112 it is same mutually defeated
Enter the 11st resistance R11 that one end ground connection is also associated between holding.
Wherein, 2113 structure of the 3rd operational amplifier is similar with the structure of the second operational amplifier 2112, herein not
Repeat again.
In addition, the second operational amplifier 2112 and the 3rd operational amplifier 2113 are connected with power supply, power supply is used for for the
Two operational amplifiers 2112 and the 3rd operational amplifier 2113 are powered.In addition, in order to avoid the interference of power supply signal, in the second fortune
The feeder ear for calculating the operational amplifier 2113 of amplifier 2112 and the 3rd is respectively connected with filter capacitor.
Power-sensing circuit 212 includes power detection chip, and power detection chip exports according to signal amplification circuit 211
The power of signal judges that material is the state that no material is in the state blocked.
Embodiment five
The present embodiment is the further explanation explanation on the basis of above-described embodiment.
The output end of power parser circuitry 21 is connected with first switch, and first switch exports according to power parser circuitry 21
Power signal is opened or closure.Or control chip is connected between power parser circuitry 21 and first switch, pass through control
The unlatching of chip controls first switch or closure.
Wherein, first switch can be used for being connected with alarming device, and alarming device can be independently of microwave receiving probe 2
Existing device or system, it can be, but not limited to as any one or more in computer, led indicator lamps or alarm.With
Led indicator lamps are illustrated, when the power signal that power parser circuitry 21 exports represents that material blocks, then first switch
Adhesive, led indicator lamps light.
Certainly, alarming device can also be arranged on microwave receiving probe 2, and alarming device might not be independently of microwave
Receiving transducer 2.
Wherein, first switch can be relay, or diode switch.
The output end of frequency displacement parser circuitry 22 is connected with second switch, and second switch exports more according to frequency displacement parser circuitry
General Le frequency shift signal is opened or closure.Or control chip is connected between frequency displacement parser circuitry 22 and second switch,
Unlatching or the closure of second switch are controlled by control chip.
Second switch may also used to be connected with the device outside microwave receiving probe.Wherein, second switch can be
Relay, or diode switch.
Wherein, first switch and second switch can be convenient as the connecting interfaces of microwave receiving probe 2 and warning device
The connection of microwave receiving probe 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 any embodiment of embodiment five, microwave receiving probe and the microwave are sent
Probe includes being used for the housing 31 for housing circuit board, and Fig. 5 is the shell for the microwave flow detector that the embodiment of the present invention six provides
The structural representation of body, as shown in figure 5, one end of housing 31 is arranged with the first opening 311, being provided with the first opening 311 can
The end cap 32 of dismounting, the one side of end cap 32 plays a part of so that the closing of housing 31, still further aspect, because end cap 32 is removable
Unload, therefore conveniently take out circuit in circuit malfunctions and repaired.Circuit board can be to be equipped with power parser circuitry
With the circuit board of frequency displacement parser circuitry, certainly, circuit board can also be the microwave transtation mission circuit being equipped with microwave transmission probe
Circuit board.
Optionally, housing 31 is metal material, thereby may be ensured that and is used under the mal-condition of material transmission.
Optionally, end cap 32 can be threadedly coupled with housing 31, can also be screwed connection.
Optionally, the salient point (not shown) for increasing friction is provided with end cap 32, so as to facilitate end cap 32
Dismounting.
In addition, the through hole 322 for housing cable is additionally provided with end cap 32, so as to instant microwave receiving transducer and outside
Equipment is attached.
Optionally, in order to strengthen the intensity of microwave transparent, the other end of housing 31 offers what is passed through for causing microwave
Second opening 312, while in order to ensure that microwave receiving probe and microwave send the closure of probe, prevent dust and other impurities from entering
Enter, it is preferred that second opening 312 on plastic window 33 is installed, microwave is good for the penetrability of plastic material, so as to so that
Obtain microwave signal and farthest reduced during sending and receiving and absorbed.Optionally, plastic window 33 is polytetrafluoroethylene (PTFE).
Optionally, the other end of housing 31, that is, one end of the second opening 312 is offered, is provided with for fixed method
Blue disk (not shown).Microwave receiving can be popped one's head in by ring flange and/or microwave sends probe and the appearance equipped with material
Device is fixed.
In the microwave flow detector that the present embodiment provides, in addition to for housing the housing of circuit board, so as to right
Circuit plays a part of protection, and in order to strengthen the intensity of microwave transparent, the other end of housing 31 is offered for so that micro-
The second opening 312 that ripple passes through, while in order to ensure that microwave receiving probe and microwave send the closure of probe, prevent dust etc.
Debris enter, second opening 312 on plastic window 33 is installed, microwave is good for the penetrability of plastic material, so as to so that
Obtain microwave signal and farthest reduced during sending and receiving and absorbed.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
- A kind of 1. microwave flow detector, it is characterised in that including：Microwave for sending microwave signal sends probe and the microwave receiving for receiving the microwave signal is popped one's head in；Wherein, the microwave receiving probe includes power parser circuitry, and the power parser circuitry is used to believe in the microwave of reception Number power signal is converted to, to judge whether material blocks according to the power signal；Wherein, the microwave receiving probe also includes：Frequency displacement parser circuitry, the frequency displacement parser circuitry are used to the microwave signal of reception being converted to Doppler frequency frequency displacement letter Number, to judge whether material flows according to the Doppler frequency frequency shift signal；Wherein, the frequency displacement parser circuitry includes：For amplifying the first operational amplifier of the microwave signal, for adjusting zero The first of point bias voltage adjusts branch road, the filtering branch road for filtering high frequency signals, for adjusting first operation amplifier The the second regulation branch road and output branch road of device multiplication factor；Wherein, the first regulation branch road and the filtering branch circuit parallel connection；The first regulation branch road includes：First resistor, second resistance and the 3rd resistor being serially connected；The filtering branch road bag Include：The first inductance, the second inductance and the first filter capacitor being serially connected, it is also connected between first inductance and the second inductance There is the second filter capacitor that one end is grounded；The output end and the in-phase input end of first operational amplifier of the first regulation branch road and the filtering branch road connect Connect；The reverse inter-input-ing ending grounding of first operational amplifier；First operational amplifier also includes the first regulation input and the second regulation input, the first regulation input The second regulation branch road is connected between the second regulation input；The second regulation branch road includes：Multiple regulation resistance units parallel with one another, the regulation resistance unit include：Mutually The toggle switch and regulation resistance of series connection；The output end of first operational amplifier is connected with the output branch road, and the output branch road includes：The first diode, the 4th resistance, the 5th resistance and the light emitting diode being serially connected, the 4th resistance and the 5th resistance Between be connected with one end ground connection the 3rd filter capacitor, be also associated between the 4th resistance and the 5th resistance one end ground connection Bleeder resistor.
- 2. microwave flow detector according to claim 1, it is characterised in that the power parser circuitry includes：For Amplify the signal amplification circuit of the microwave signal and the power-sensing circuit for detecting power；The signal amplification circuit includes：The second operational amplifier and the 3rd operational amplifier being serially connected, second fortune Amplifier is calculated by the 7th resistance and the 4th capacitance connection to the in-phase input end of the 3rd operational amplifier, the described 3rd transports The output end for calculating amplifier is connected by the 8th resistance with the power-sensing circuit.
- 3. microwave flow detector according to claim 1, it is characterised in that the output end of the power parser circuitry connects First switch is connected to, the power signal that the first switch exports according to the power parser circuitry is opened or closure, described The output end of frequency displacement parser circuitry is connected with second switch, and how general the second switch export according to the frequency displacement parser circuitry Frequency shift signal is strangled to open or close.
- 4. according to the microwave flow detector described in claim any one of 1-3, it is characterised in that microwave receiving probe and The microwave, which sends probe, to be included being used for the housing for housing circuit board, and one end of the housing offers the first opening, described Detachable end is installed in first opening.
- 5. microwave flow detector according to claim 4, it is characterised in that be provided with the end cap and rubbed for increase The salient point of wiping；The through hole for housing cable is provided with the end cap.
- 6. microwave flow detector according to claim 4, it is characterised in that the other end of the housing, which offers, to be used for So that microwave pass through second opening, it is described second opening on plastic window is installed.
- 7. microwave flow detector according to claim 4, it is characterised in that the other end of the housing is provided with use In fixed ring flange.
- 8. microwave flow detector according to claim 6, it is characterised in that the plastic window is polytetrafluoroethylene (PTFE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610204265.2A CN105738956B (en) | 2016-04-01 | 2016-04-01 | Microwave flow detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610204265.2A CN105738956B (en) | 2016-04-01 | 2016-04-01 | Microwave flow detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105738956A CN105738956A (en) | 2016-07-06 |
| CN105738956B true CN105738956B (en) | 2017-12-01 |
Family
ID=56252752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610204265.2A Active CN105738956B (en) | 2016-04-01 | 2016-04-01 | Microwave flow detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105738956B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919814A (en) * | 1982-07-27 | 1984-02-01 | Nippon Steel Corp | Microwave flow meter |
| CN86106018A (en) * | 1986-09-12 | 1988-03-23 | 西安市电子测量仪器厂 | Microparticle flow-measuring method and coke powder flowmeter |
| JPH1019620A (en) * | 1996-07-01 | 1998-01-23 | Toshiba Corp | Flow measuring device |
| US9031797B2 (en) * | 2007-09-18 | 2015-05-12 | Schlumberger Technology Corporation | Multiphase flow measurement |
| CN201255645Y (en) * | 2008-09-25 | 2009-06-10 | 北京天凯华尊科技有限公司 | Microwave flow detector |
| US8028588B2 (en) * | 2009-09-25 | 2011-10-04 | Rosemount Inc. | Flow measurement using near field microwaves |
| CN103162751B (en) * | 2013-02-05 | 2015-04-15 | 天津大学 | Ultrasonic flowmeter |
-
2016
- 2016-04-01 CN CN201610204265.2A patent/CN105738956B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105738956A (en) | 2016-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105738956B (en) | Microwave flow detector | |
| CN101410698B (en) | Magnetic flowmeter for measuring process flow and method therefor | |
| CN101896024B (en) | Illumination apparatus | |
| CN106529867A (en) | Warehouse output and input management system and method | |
| CN100347524C (en) | Wireless and passive water meter and gas meter | |
| CN203894408U (en) | Microwave detector based on Doppler effect | |
| CN102445600A (en) | Optimization method based on traditional phase difference measurement and circuit | |
| CN104849238A (en) | Infrared turbidity detection device | |
| CN203811737U (en) | Direct-current electric-leakage monitoring and warning device | |
| CN108444935A (en) | A kind of temperature-compensation method and compensation device of non-dispersive infrared gas sensor | |
| CN207140364U (en) | A kind of 3D printer with auto-alarm function | |
| CN204086416U (en) | A kind of electronic product detecting system | |
| CN103995208A (en) | Direct current leakage monitoring and alarming device | |
| CN105866553A (en) | Instrument and method for on-line detection of ground resistor | |
| CN105607132A (en) | Oscillation detection-based metal detector | |
| CN105717173A (en) | Two-wire toxic gas detector with digital display function | |
| CN108572331A (en) | A kind of portable multi-channel car light on-line detecting system | |
| CN110927464B (en) | Online detection system for isolated power supply | |
| EP1797447B1 (en) | An electronic unit, especially for detecting living organisms | |
| CN204185082U (en) | A kind of cage control monitor unit | |
| CN203537322U (en) | Weak photoelectric signal amplification circuit and processing board | |
| CN211008019U (en) | Anti-interference electronic lock for unmanned sales counter | |
| CN107664042A (en) | A kind of colliery ventilation safety monitoring system | |
| CN205449869U (en) | Take two line toxic gas detectors of digital display function | |
| CN206991505U (en) | A kind of data transmission system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 102209 Beijing city Changping District town Beiqijia hongxianghong enterprise incubator E a 103-A Applicant after: Beijing TKHZ Science & Technology Co., Ltd. Address before: 102208 Beijing city Changping District Huilongguan Hospital Shong plate group Applicant before: Beijing TKHZ Science & Technology Co., Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |