CN201945891U - Object level / liquid level monitoring system based on wireless sensor networks - Google Patents
Object level / liquid level monitoring system based on wireless sensor networks Download PDFInfo
- Publication number
- CN201945891U CN201945891U CN201020669889XU CN201020669889U CN201945891U CN 201945891 U CN201945891 U CN 201945891U CN 201020669889X U CN201020669889X U CN 201020669889XU CN 201020669889 U CN201020669889 U CN 201020669889U CN 201945891 U CN201945891 U CN 201945891U
- Authority
- CN
- China
- Prior art keywords
- signal
- control
- data
- frequency
- digital
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model relates to a monitoring system used for non-contact measuring object levels and liquid levels of a container and a storage in industrial production processes, which solves the technical problem that an existing continuous wave frequency modulation system radar level meter has shortcomings so as to realize lowcost Ku frequency band measurement terminal. The object level and liquid level monitoring system is characterized in that the measurement terminal mainly consists of a microwave radio frequency unit, an immediate-frequency signal processing collection unit, a linear frequency modulation output control unit and a data output display unit. The object level and liquid level monitoring system enables the measurement terminal to have bigger frequency modulation brand width, higher measurement resolution and miniature volume on the base of guaranteed low cost. The measurement terminal has an automatic calibration function, can automatically adjust pressure control signal amplitudes according to environment temperatures and VOC (voltage controlled oscillator) different frequency response properties, and improves measurement accuracy. Based on the wireless sensor networks, application restriction of complicated wire arrangement caused by traditional wire transmission is avoided when the object level and liquid level monitoring system is applied to multipoint monitoring of large-scale factories and mines.
Description
Technical field:
The utility model relates to the automatic measurement technology field, is specifically related to a kind of thing position of industrial processes container, storage and non-cpntact measurement supervisory system of liquid level of being used for.
Background technology:
The thing position is one of important measurement parameter of industrial processes.Level gauging for solid material, the main means in past are contact type measurements, and as measuring methods such as condenser type, Weight type, tuning-fork type, blocking rotary types, instrument contacts with material during owing to measurement, in use tend to occur variety of issue, and daily maintenance is very big.Begin to adopt non-contacting level gauging to the nineties in 20th century, early ripe non-contacting measuring technique has ultrasonic technology and nuclear radiation tech (gamma-rays), and nuclear radiation tech is restricted on using because of radioactive source is arranged.
Ultrasonic technology is present most widely used contactless measurement, supersonic wave level must be propagated by means of medium, as with air as propagation medium, and the variation of temperature of air, humidity, component etc. can influence ultrasonic propagation velocity, airborne dust hyperacoustic transmitting signal of also will decaying.In measurement,, ultrasonic signal there is stronger decay, so measurement effect is unsatisfactory because powder storehouse thing site surface is very loose when blanking to thing position, powder storehouse.
Radar levelmeter has the characteristics of noncontact, resolution height, medium wide adaptability, is not subjected to the influence of dust, steam and media components, and material temperature, pressure, density etc. influence hardly to be measured accurately to it, thereby has in industry obtained being extensive use of.
The measuring method that radar levelmeter is commonly used has two kinds, pulsed and continuous wave frequency formula.Pulsed measurement advantage is little for measuring the blind area, but need carry out the echo frontier high-speed sampling in the time of nanosecond, and technical difficulty is big, and resolution is low, is replaced by the continuous wave frequency formula gradually.Analyze in the present industry the extensively continuous wave frequency system radar levelmeter of employing of institute, though it realizes that technical difficulty is low, but be subjected to restrictions such as scheme and device application mode, have precision not high, be difficult to adapt to wide temperature environment and unit and measure the not high deficiency of automaticity, be difficult to adapt to the application demand of extensive factories and miness robotization thing position, level gauging monitoring.
The utility model content:
Technical problem to be solved in the utility model provides a kind of thing position/level monitoring system based on wireless sense network, deficiency at continuous wave frequency system radar levelmeter of the prior art, realize low-cost Ku frequency range measuring terminals by conceptual design, and the brand-new radar working system and the technical implementation way that are different from continuous wave frequency, and design based on wireless sense network, it is little to make system have a volume, the measuring accuracy height, the temperature environment adaptive faculty is strong, automaticity is high and based on the telework control of wireless sense network, teledata such as obtains at advantage, uses flexibly, convenient.
The utility model solves the problems of the technologies described above by the following technical solutions:
A kind of thing position/level monitoring system based on wireless sense network comprises measuring terminals, monitor terminal; It is characterized in that: described measuring terminals mainly is made up of microwave radio unit, intermediate-freuqncy signal processing collecting unit, linear frequency modulation output control unit, data output display unit;
Described microwave radio unit is made up of Ku wave band electromagnetic horn 1, single-pole double-throw switch (SPDT) 2, microwave switch 3, absorption-type single double-pole double throw switch 4, voltage controlled oscillator VCO 5, low noise amplifier LNA6, frequency mixer 7, amplifier 8;
Described intermediate-freuqncy signal is handled collecting unit and is made up of wave filter 9, digital gain control amplifier 11, wave filter 12, amplifier 13, analog to digital converter AD14, digital signal processor DSP 15;
Described linear frequency modulation output control unit is made up of programmable logic device (CPLD) 18, digital to analog converter DA10, temperature sensor 19.
The stepping plateau voltage control that described voltage controlled oscillator VCO 5 produces according to digital to analog converter DA10 produces the frequency step radiofrequency signal of high linearity, through in microwave switch 3, carrying out pulse amplitude modulation behind the absorption-type single double-pole double throw switch 4, after single-pole double-throw switch (SPDT) 2 gating transmitting branches are launched by electromagnetic horn 1, microwave switch 3 is controlled by the control signal of programmable logic device (CPLD) 18 generations of linear frequency modulation output control unit.
Received signal enters low noise amplifier LNA6 and carries out the radio frequency amplification after electromagnetic horn 1, single-pole double-throw switch (SPDT) 2 and microwave switch 3 receive gating, the local oscillation signal that is coupled with VCO5 in frequency mixer 7 goes oblique mixing then, produces the video pulse signal that is subjected to apart from beat control.
The signal input intermediate-freuqncy signal of described microwave radio unit output is handled collecting unit and is handled, the signal of input carries out gain control through 11 pairs of signal echo energy of digital gain control amplifier, signal after the gain control carries out baseband signal filtering by wave filter 12 and amplifier 13 carries out the baseband signal amplification, carry out analog to digital conversion AD14 sampling then and become digital signal, carry out the spectrum analysis of echoed signal in DSP15 by FFT, the frequency size of echoed signal is directly proportional with the height of thing position/liquid level.DSP15 obtains the gain control signal of gain-controlled amplifier 11 and the true altitude of thing position/liquid level according to frequency size and the energy that spectrum analysis obtains.
DSP15 tables look-up and selects VCO5 frequency response stepped voltage control word under this temperature according to the Current Temperatures that temperature sensor 19 detects, and control CPLD18 produces corresponding stepping plateau voltage by this group control word control digital to analog converter DA10.
Described data output display unit is made up of data transmit-receive module 16, number biography antenna 17, data disaply moudle 20, the height value measured data that measuring terminals obtains can show in real time by data disaply moudle 20, is transmitted into monitor terminal by number biography antenna 17 and data transmit-receive module 16 simultaneously; Number passes antenna 17 and the data transmit-receive module 16 synchronous working control signal that receive the monitor terminal emission simultaneously, according to the control switch operating state or the holding state of monitor terminal.Monitor terminal mainly passes antenna 22, data transmit-receive module 23, RS232 chip 24, single-chip microcomputer 25, data display equipment 26, supervisory control comuter 27 and power module 28 by number and forms, the measured data that measuring terminals sends is passed by data transmit-receive module 23 and number carries out real-time graph or text display by supervisory control comuter 27 after antenna 22 receives after monitoring software is handled, and carries out the data value demonstration by single-chip microcomputer 25 control data display devices 26; Send measuring terminals work steering order by supervisory control comuter 27 to data transmit-receive module 23 simultaneously, and pass antenna 22 emissions, the duty of control survey terminal by number.
The utility model brings following beneficial effect:
The utility model mainly possesses following technical characterstic and advantage:
1. realized the low-cost design of Ku waveband radio frequency end, made measuring terminals guarantee that cheaply modulating bandwidth is bigger, Measurement Resolution is higher and miniaturization more on the basis;
2. measuring terminals has automatic calibration function, can adjust voltage-controlled signal amplitude automatically according to environment temperature and the different Frequency Responses of VCO, guarantees FM signal high linearity and system's wide environmental temperature adaptability, improves measuring accuracy;
3. based on wireless sense network design, when using, extensive factories and miness multi-point monitoring avoided the application limitations of the wiring complexity that traditional wire transmission mode brings.
Description of drawings:
Fig. 1 measuring terminals composition frame chart.
Fig. 2 monitor terminal composition frame chart
Fig. 3 step frequency signal synoptic diagram
The integrated measurement terminal of Fig. 4 synoptic diagram
Fig. 5 monitor terminal synoptic diagram
Fig. 6 wireless sense network hub-and-spoke network topology structural representation
Fig. 7 monitor terminal sends data protocol
Fig. 8 measuring terminals feedback data agreement
Embodiment:
1, measuring terminals and monitor terminal unit embodiment
As Fig. 1 measuring terminals composition frame chart, be radio frequency part in the frame of broken lines; 1 is Ku wave band electromagnetic horn; 2 is single-pole double-throw switch (SPDT); 3 is microwave switch; 4 is the absorption-type single double-pole double throw switch; 5 is voltage controlled oscillator; 6 is low noise amplifier; 7 is frequency mixer; 8 is amplifier; 9 is wave filter; 10 is digital to analog converter; 11 is the digital gain control amplifier; 12 is wave filter; 13 is amplifier; 14 is analog to digital converter; 15 is digital signal processor; 16 is data transmit-receive module; 17 are number biography antenna; 18 is programmable logic device (PLD); 19 is temperature sensor; 20 is data presentation; 21 is power module.
As Fig. 2 monitor terminal composition frame chart, 22 are number biography antenna; 23 is data transmit-receive module; 24 is the RS232 chip; 25 is single-chip microcomputer; 26 is data presentation; 27 is supervisory control comuter; 28 is power module.
Measuring terminals and monitor terminal independently are installed on respectively in two metal shells as Fig. 4, shown in Figure 5, and among Fig. 4,29 is the measuring terminals housing; 30 is mounting flange; 31 are number biography antenna; 32 is electromagnetic horn; 33 is antenna direction adjustment, Positioning Gear; 34 is data disaply moudle.Among Fig. 5,35 is the monitor terminal housing; 36 are number biography antenna; 37 is data disaply moudle; 38 is supervisory control comuter.
For improving ease of use, measure antenna and measuring terminals housing 29 and can carry out integrated design (as Fig. 4), adopt metal flange dish 30 to realize the installation of measuring terminals and storing/liquid equipment, adjust, locate by antenna direction adjustment, 33 pairs of controlling antenna wave beam to point of Positioning Gear, when the system equipment Installation and Debugging, improve debugging efficiency and and provide beam position condition preferably for system stability work.
At first be in the low-power consumption standby state during system works, do not carry out thing/level gauging monitoring this moment, after monitor terminal monitoring PC27 produced the system works instruction by the monitoring Control Software, this instruction passed antenna 22 by data transmit-receive module 23 and number and launches; After measuring terminals number biography antenna 17 and data transmit-receive module 16 receive instruction, import master control DSP15 into, DSP15 starts whole thing/level monitoring system work according to work order.
During system works, the Current Temperatures that DSP15 at first detects according to temperature sensor 19, table look-up and select VCO5 frequency response stepped voltage control word under this temperature, control CPLD18 produces corresponding stepping plateau voltage by this group control word control DA10, as shown in Figure 3, VCO5 carries out pulse amplitude modulation according to the frequency step radiofrequency signal that the stepping plateau voltage produces high linearity in microwave switch 3 behind absorbing load formula single-pole double-throw switch (SPDT) 4, after single-pole double-throw switch (SPDT) 2 gating transmitting branches are launched by electromagnetic horn 1, the control signal of microwave switch 3 is produced according to the synchronized relation of system by CPLD18.Received signal enters LNA6 and carries out the radio frequency amplification after electromagnetic horn 1, single-pole double-throw switch (SPDT) 2 and microwave switch 3 receive gating, the local oscillation signal that is coupled with VCO5 in frequency mixer 7 goes oblique mixing then, generation is subjected to the video pulse signal apart from beat control, after produce before the microwaves through amplifier 8 and wave filter 9 backs in output.The utility model has utilized the pulse step characteristics of system frequently, adopt single-pole double-throw (SPDT) and monopole single throw microwave switch gating, the pulsed modulation and the transmit-receive sharing mode of operation of system have been realized, expensive devices such as the common isolator that adopts, circulator in the radio frequency component design have in the past been replaced, under the prerequisite that has guaranteed system performance, farthest reduced the cost of system.
The signal of output carries out gain control through 11 pairs of signal echo energy of digital gain control amplifier in preceding, and the gain control signal of digital gain control amplifier is adjusted according to the energy of echoed signal spectrum analysis acquisition is big or small in real time by DSP15.Signal after the gain control carries out baseband signal filtering by wave filter 12 and amplifier 13 carries out the baseband signal amplification, carry out the AD14 sampling then and become digital signal, carry out the spectrum analysis of echoed signal in DSP15 by FFT, the frequency size of echoed signal is directly proportional with the height of thing position/liquid level.DSP15 produces the gain control signal of gain-controlled amplifier 11 and the true altitude of thing position/liquid level according to frequency size and the energy that spectrum analysis obtains, height value can show in real time by data disaply moudle 20, be transmitted into monitor terminal by measuring terminals number biography antenna 17 and data transmit-receive module 16 simultaneously, measured data receives the back by monitor terminal data transmit-receive module 23 and number biography antenna 22 and carries out real-time graph or text display by monitoring PC27 monitoring software, carries out the data value demonstration by single-chip microcomputer 25 control monitor terminal data display equipments 26 simultaneously.Power module 21 and 28 is respectively measuring terminals and monitor terminal provides working power.
2. based on wireless sense network thing position level monitoring system (networking) embodiment
Thing position/level monitoring system based on wireless sense network adopts the hub-and-spoke network topology structure, and the network topology synoptic diagram as shown in Figure 6.Because all have wireless data transceiver module in measuring terminals and the monitor terminal, therefore, the wireless sense network networking need not to add networking equipment.
When system used, monitor terminal and each measuring terminals adopted master-slave mode half-duplex wireless telecommunications.At first every measuring terminals is distributed an identity ID sign indicating number, each measuring terminals work is initially in holding state, monitor terminal by wireless data transmission to all measuring terminals launch terminal ID sign indicating numbers and command control word (sending data protocol as shown in Figure 7), measuring terminals at first is complementary the Termination ID sign indicating number of reception and the ID sign indicating number of self after receiving ID sign indicating number and command control word, if the command control word that coupling then receives is the command instruction of monitor terminal to this machine, this measuring terminals is carried out corresponding work by command control word; If do not match, then should instruction have nothing to do with this machine, measuring terminals keeps standby or former duty, and duty does not change.Order control mainly is divided into start, standby, transmission measurement data etc.
When measuring terminals receives the command packet that is complementary with the self ID sign indicating number, carry out associative operation according to this instruction, and the Status Flag after will changing beams back monitor terminal (the feedback data agreement is as shown in Figure 8), confirm with monitor terminal.
By above-mentioned master-slave mode work, data communication can not occur between monitor terminal and measuring terminals and conflict, guaranteed system's control and reliability of data transmission and stability.
Claims (1)
1. the thing position/level monitoring system based on wireless sense network comprises measuring terminals, monitor terminal; It is characterized in that: described measuring terminals mainly is made up of microwave radio unit, intermediate-freuqncy signal processing collecting unit, linear frequency modulation output control unit, data output display unit;
Described microwave radio unit is made up of Ku wave band electromagnetic horn (1), single-pole double-throw switch (SPDT) (2), microwave switch (3), absorption-type single double-pole double throw switch (4), voltage controlled oscillator VCO (5), low noise amplifier LNA (6), frequency mixer (7), amplifier (8);
Described intermediate-freuqncy signal is handled collecting unit and is made up of wave filter (9), digital gain control amplifier (11), wave filter (12), amplifier (13), analog to digital converter AD (14), digital signal processor DSP (15);
Described linear frequency modulation output control unit is made up of programmable logic device (CPLD) (18), digital to analog converter DA (10), temperature sensor (19);
The stepping plateau voltage control that described voltage controlled oscillator VCO (5) produces according to digital to analog converter DA (10) produces the frequency step radiofrequency signal of high linearity, through in microwave switch (3), carrying out pulse amplitude modulation behind the absorption-type single double-pole double throw switch (4), after single-pole double-throw switch (SPDT) (2) gating transmitting branch is launched by electromagnetic horn (1), microwave switch (3) is controlled by the control signal of programmable logic device (CPLD) (18) generation of linear frequency modulation output control unit;
Received signal enters low noise amplifier LNA (6) and carries out the radio frequency amplification after electromagnetic horn (1), single-pole double-throw switch (SPDT) (2) and microwave switch (3) receive gating, the local oscillation signal that is coupled with VCO (5) in frequency mixer (7) goes oblique mixing then, produces the video pulse signal that is subjected to apart from beat control;
The signal input intermediate-freuqncy signal of described microwave radio unit output is handled collecting unit and is handled, the signal of input carries out gain control through digital gain control amplifier (11) to the signal echo energy, signal after the gain control carries out baseband signal filtering by wave filter (12) and amplifier (13) carries out the baseband signal amplification, carry out analog to digital conversion AD (14) sampling then and become digital signal, carry out the spectrum analysis of echoed signal by FFT in DSP (15), the frequency size of echoed signal is directly proportional with the height of thing position/liquid level; DSP (15) obtains the gain control signal of gain-controlled amplifier (11) and the true altitude of thing position/liquid level according to frequency size and the energy that spectrum analysis obtains;
DSP (15) tables look-up and selects VCO (5) frequency response stepped voltage control word under this temperature according to the Current Temperatures that temperature sensor (19) detects, and control CPLD (18) produces corresponding stepping plateau voltage by this group control word control digital to analog converter DA (10);
Described data output display unit is made up of data transmit-receive module (16), number biography antenna (17), data disaply moudle (20), the height value measured data that measuring terminals obtains can show in real time by data disaply moudle (20), is transmitted into monitor terminal by number biography antenna (17) and data transmit-receive module (16) simultaneously; Number biography antenna (17) and data transmit-receive module (16) receive the working control signal of monitor terminal emission synchronously simultaneously, according to the control switch operating state or the holding state of monitor terminal; Monitor terminal mainly passes antenna (22), data transmit-receive module (23), RS232 chip (24), single-chip microcomputer (25), data display equipment (26), supervisory control comuter (27) and power module (28) by number and forms, the measured data of measuring terminals transmission is passed by data transmit-receive module (23) and number carries out real-time graph or text display by supervisory control comuter (27) after antenna (22) receives after monitoring software is handled, and carries out the data value demonstration by single-chip microcomputer (25) control data display device (26); Send measuring terminals work steering order by supervisory control comuter (27) to data transmit-receive module (23) simultaneously, and pass antenna (22) emission, the duty of control survey terminal by number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020669889XU CN201945891U (en) | 2010-12-17 | 2010-12-17 | Object level / liquid level monitoring system based on wireless sensor networks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020669889XU CN201945891U (en) | 2010-12-17 | 2010-12-17 | Object level / liquid level monitoring system based on wireless sensor networks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201945891U true CN201945891U (en) | 2011-08-24 |
Family
ID=44473228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020669889XU Expired - Lifetime CN201945891U (en) | 2010-12-17 | 2010-12-17 | Object level / liquid level monitoring system based on wireless sensor networks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201945891U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514234A (en) * | 2011-12-21 | 2012-06-27 | 江门市金钩包装机械有限公司 | Adjusting system of thin cutter paper separating line pressing machine of automatic sidesway mechanism |
| CN103641058A (en) * | 2013-12-11 | 2014-03-19 | 兰州理工大学 | System for measuring and metering oil in tank truck automatically |
| GB2521136A (en) * | 2013-12-10 | 2015-06-17 | Dynamic Flow Technologies Ltd | Waste water flow quantifying apparatus, method and computer program |
| CN105675085A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Frequency-modulated continuous-wave radar level gauge |
| CN106840310A (en) * | 2017-02-17 | 2017-06-13 | 水利部南京水利水文自动化研究所 | A kind of CW/FM continuous wave/frequency modulated modulated indicator water gage measuring method |
| CN107063391A (en) * | 2017-03-30 | 2017-08-18 | 美核电气（济南）股份有限公司 | A kind of contactless pair of thing position intelligent checking system |
| CN108151831A (en) * | 2017-12-08 | 2018-06-12 | 重庆多邦科技股份有限公司 | A kind of frequency modulation radar body place meter |
| CN108291832A (en) * | 2015-11-17 | 2018-07-17 | Vega格里沙贝两合公司 | Antenna equipment and the method for operating antenna equipment |
| CN109991598A (en) * | 2017-12-29 | 2019-07-09 | 西门子（中国）有限公司 | The real-time section survey device and method of array frequency modulated(FM) radar |
| CN112666185A (en) * | 2020-10-27 | 2021-04-16 | 西安交通大学 | Remote crude oil water content measuring device based on microwave transmission method and measuring method thereof |
| CN113252139A (en) * | 2021-06-28 | 2021-08-13 | 北京锐达仪表有限公司 | Guided wave radar level meter for adjusting transmitted signal waveform |
-
2010
- 2010-12-17 CN CN201020669889XU patent/CN201945891U/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102514234A (en) * | 2011-12-21 | 2012-06-27 | 江门市金钩包装机械有限公司 | Adjusting system of thin cutter paper separating line pressing machine of automatic sidesway mechanism |
| CN102514234B (en) * | 2011-12-21 | 2014-12-10 | 江门市金钩包装机械有限公司 | Adjusting system of thin cutter paper separating line pressing machine of automatic sidesway mechanism |
| GB2521136A (en) * | 2013-12-10 | 2015-06-17 | Dynamic Flow Technologies Ltd | Waste water flow quantifying apparatus, method and computer program |
| GB2521136B (en) * | 2013-12-10 | 2021-04-07 | Dynamic Flow Tech Limited | Waste water flow quantifying apparatus, method and computer program |
| CN103641058A (en) * | 2013-12-11 | 2014-03-19 | 兰州理工大学 | System for measuring and metering oil in tank truck automatically |
| CN105675085A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Frequency-modulated continuous-wave radar level gauge |
| CN105675085B (en) * | 2014-11-21 | 2019-03-29 | 中国航空工业集团公司雷华电子技术研究所 | A kind of frequency modulated continuous wave radar liquidometer |
| CN108291832A (en) * | 2015-11-17 | 2018-07-17 | Vega格里沙贝两合公司 | Antenna equipment and the method for operating antenna equipment |
| CN108291832B (en) * | 2015-11-17 | 2020-08-11 | Vega格里沙贝两合公司 | Antenna device, filling level measuring device and method for operating antenna device |
| CN106840310B (en) * | 2017-02-17 | 2020-06-26 | 水利部南京水利水文自动化研究所 | Continuous frequency modulation wave radar level gauge measuring method |
| CN106840310A (en) * | 2017-02-17 | 2017-06-13 | 水利部南京水利水文自动化研究所 | A kind of CW/FM continuous wave/frequency modulated modulated indicator water gage measuring method |
| CN107063391A (en) * | 2017-03-30 | 2017-08-18 | 美核电气（济南）股份有限公司 | A kind of contactless pair of thing position intelligent checking system |
| CN107063391B (en) * | 2017-03-30 | 2023-07-25 | 美核电气（济南）股份有限公司 | Non-contact type double-material-level intelligent detection system |
| CN108151831A (en) * | 2017-12-08 | 2018-06-12 | 重庆多邦科技股份有限公司 | A kind of frequency modulation radar body place meter |
| CN109991598A (en) * | 2017-12-29 | 2019-07-09 | 西门子（中国）有限公司 | The real-time section survey device and method of array frequency modulated(FM) radar |
| CN112666185A (en) * | 2020-10-27 | 2021-04-16 | 西安交通大学 | Remote crude oil water content measuring device based on microwave transmission method and measuring method thereof |
| CN112666185B (en) * | 2020-10-27 | 2023-04-07 | 西安交通大学 | Remote crude oil water content measuring device based on microwave transmission method and measuring method thereof |
| CN113252139A (en) * | 2021-06-28 | 2021-08-13 | 北京锐达仪表有限公司 | Guided wave radar level meter for adjusting transmitted signal waveform |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201945891U (en) | Object level / liquid level monitoring system based on wireless sensor networks | |
| CN1906500B (en) | Compact-size, low-power-consumption, short pulse radar and its control method | |
| CN201876545U (en) | Pulse phase type laser distance measuring instrument | |
| CN102508215A (en) | Double-channel active and passive radar integrated simulator | |
| CN205899013U (en) | X wave band radar installations based on all solid state coherent technical development | |
| CN204215035U (en) | Monitoring road vehicles FMCW millimeter wave microstrip array radar | |
| CN111817795A (en) | Beidou radio frequency baseband product testing device | |
| CN208805564U (en) | A kind of radar beacon machine | |
| CN101262239A (en) | Mm wave RF receiving/transmission device | |
| CN105675085A (en) | Frequency-modulated continuous-wave radar level gauge | |
| CN113795770B (en) | Signal processing method, device and system | |
| CN107192473B (en) | Surface acoustic wave temperature detection system and detection method based on phased array antenna | |
| CN110988824A (en) | Radio frequency target simulator | |
| CN112985540B (en) | Split type guided wave radar level gauge based on gated frequency modulated continuous wave | |
| CN203825187U (en) | Radiofrequency store-and-forward ship-borne radar active calibration device | |
| CN212807237U (en) | 120GHz frequency modulation continuous wave radar level meter | |
| CN210835215U (en) | Test detection device for automobile radar | |
| CN113064123A (en) | Multi-parameter calibrating device for multi-target radar velocimeter and echo simulation method | |
| CN109084647B (en) | Control device and method for remotely detecting near-explosion detonation | |
| CN204539157U (en) | A kind of interference source device for the test of concentrator wireless public network communication automation system | |
| CN112986976B (en) | Water flow speed measuring radar | |
| Scheiblhofer et al. | Concept and realization of a low-cost multi-target simulator for CW and FMCW radar system calibration and testing | |
| CN204539160U (en) | A kind of interference source device for the test of acquisition terminal GPRS communication automation system | |
| CN108683987A (en) | A kind of Indoor Positioning System Using Ultra Wideband Radio and method based on UWB | |
| CN204836182U (en) | Quick testing arrangement of passive intermodulation of POI system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110824 |
|
| CX01 | Expiry of patent term |