CN104132710A - Water level flow sensor, water level flow monitoring system and water level flow monitoring method - Google Patents
Water level flow sensor, water level flow monitoring system and water level flow monitoring method Download PDFInfo
- Publication number
- CN104132710A CN104132710A CN201410295849.6A CN201410295849A CN104132710A CN 104132710 A CN104132710 A CN 104132710A CN 201410295849 A CN201410295849 A CN 201410295849A CN 104132710 A CN104132710 A CN 104132710A
- Authority
- CN
- China
- Prior art keywords
- circuit
- stage
- water level
- discharge sensor
- level flow
- 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.)
- Granted
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The invention provides a water level flow sensor, a water level flow monitoring system and a water level flow monitoring method. The water level flow sensor comprises a water level measuring rod with multiple contacts, a multipath voltage comparison circuit connected with the contacts, a multipath selection circuit correspondingly connected with the multipath voltage comparison circuit, a master control circuit for receiving signals output by the multipath selection circuit, and a data transmitting and output circuit connected with the master control circuit. The water level flow monitoring system comprises an upper computer and the water level flow sensor which are correspondingly connected through an RS-232/RS-485 converter. The water level flow sensor and the water level flow monitoring system have the advantages that water level flow in channels can be measured in water continuously, accurately and quickly, results can be displayed in a digital tube and the upper computer, the water level flow sensor and the water level flow monitoring system are corrosion resistant, long in service life and stable in operation, and the like.
Description
Technical field
The present invention and stage-discharge monitoring field, be specifically related to a kind of for surveying stage-discharge sensor, stage-discharge monitoring system and the stage-discharge monitoring method of flow.
Background technology
At present, Shi Ge lack of water big country of China, and agricultural irrigation water accounts for the more than 60% of China's total water amount, therefore, agricultural is realized to precision irrigation, to save the very urgent requirement that agricultural water resources is field irrigation, is also the major action that realizes sustainable development simultaneously.
At present, in irrigated area, conventional water gaging method has current meter water gaging, hydraulic structure water gaging, ad hoc water measure equipment water gaging etc., and wherein current meter water gaging is mainly taking velocity_area method as main, although measuring accuracy is high, but expensive, troublesome poeration, is not easy to spread.For irrigation canal, the method is generally used for the check calibration of stage discharge relation and controls the water quantity monitoring of important section.Although utilize hydraulic structure water gaging simple, error is larger, in addition hydraulic structure aging, be out of shape, rush the reasons such as what, measuring accuracy does not ensure.Utilize ad hoc water measure equipment facility to carry out water gaging, facilities engineering cost is high, and ditch water flow situation is larger on accuracy of observation impact, as Sediment Siltation, floating thing impact etc.; And the calibration workload of stage-discharge is large, be not easy to carry out numeral and graphical information robotization transmission.Therefore, China irrigated area is in the urgent need in conjunction with irrigation canal or river course actual conditions, researches and develops economic, practically, and the stage-discharge that price is suitable, be convenient to realize digital information transmission measures and monitoring equipment.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, adapt to reality needs, aim to provide a kind of accurately Quick Measurement stage-discharge and long service life, working stability stage-discharge sensor, stage-discharge monitoring system and stage-discharge monitoring method.
In order to realize object of the present invention, the technical scheme of this employing is:
Design a kind of stage-discharge sensor, comprise water-level detecting bar, on described water-level detecting bar, be provided with the contact of some, also comprise the plurality of voltages comparator circuit of connection corresponding to described contact, with the corresponding multiplexer circuit being connected of described plurality of voltages comparator circuit, for receiving the governor circuit of described multiplexer circuit output signal delivery rate signal, for receiving flow signal that described governor circuit exports and the data that flow signal is sent to host computer being become and send output circuit.
Described governor circuit comprises clock circuit, reset circuit and the jtag interface circuit of microcontroller chip, all connections corresponding to described microcontroller chip, and described microcontroller chip is any in MSP430 series monolithic.
Described clock circuit comprises low-frequency oscillatory network, high-frequency oscillating circuits, and described low-frequency oscillatory network comprises the low frequency crystal oscillator of 10.768KHz～32.768KHz, and described high-frequency oscillating circuits comprises the high frequency crystal oscillator of 450KHz～8MHz; Described multiplexer circuit comprises multiplexer ADG732; Described data become the MAX3232 chip that send output circuit to comprise connection corresponding to described microcontroller chip, with the corresponding RS-232 interface being connected of this MAX3232 chip; Described reset circuit is R-C reset circuit.
Described water-level detecting bar comprises housing, and described contact is arranged on housing outer surface along its axis direction with the equidistant distance of 0.5～5.0mm.
Described contact is stainless steel screw, and the screw on this stainless steel screw emits and is arranged at described housing outer surface.
Described plurality of voltages comparator circuit, multiplexer circuit, microcontroller chip, clock circuit are all positioned on circuit board, and described circuit board is arranged in described enclosure interior cavity, and are set its sealing by epoxy.
This stage-discharge sensor also comprise corresponding with described microcontroller chip connect and for showing the digital display tube group of flow information.
A kind of stage-discharge monitoring system, comprises host computer, above-described stage-discharge sensor; Described stage-discharge sensor is via the connection corresponding to described host computer of RS-232/RS-485 converter.
A method of utilizing the above stage-discharge monitoring system to carry out stage-discharge monitoring, comprises the steps:
1. the water-level detecting bar of described stage-discharge sensor is laid according to a conventional method to the corresponding position in channel or river to be detected;
2. by the voltage between the different contacts of the plurality of voltages comparator circuit collection of stage-discharge sensor and compare with reference voltage, afterwards result is exported in multiplexer circuit;
3. multiplexer circuit is encoded the voltage signal of input and is inputed in the governor circuit of stage-discharge sensor;
4. the coded signal inputing in it is treated to water signal R by governor circuit, and will in this water signal R substitution following formula, calculate the flow Q of channel to be detected or corresponding position, river:
（1）；
In formula (1), A is device for channel discharge cross section area; N is channel roughness; I is channel longitudinal gradient; Wherein, lay site fixing in the situation that at stage-discharge sensor, device for channel discharge cross section area A and water signal R are corresponding funtcional relationship, thereby only need measure corresponding water signal, can know the flow of corresponding check point;
5. described governor circuit exports in host computer by gained flow Q via RS-232/RS-485 converter and exports display terminal to and shows.
Beneficial effect of the present invention is:
1. this stage-discharge sensor measurement precision is high, reliable and stable, by recording the magnitude of voltage of the different contacts of water-level detecting bar, and compare, by stage-discharge information being presented on display terminal and showing in real time after the analyzing and processing of microcontroller chip, be convenient to staff and observe intuitively, secondly can become and send output circuit that output information is transferred in host computer via the data in this sensor.
Water-level detecting bar of the present invention by stainless steel screw the contact as outside, and by epoxy resin, enclosure interior cavity and circuit board are sealed, in this sensor water inlet water time, first cocoa is to make this water-level detecting bar have good corrosion resistance, sealing, avoid water body to cause the damages such as corrosion to this water-level detecting bar and inner circuit thereof, increase its serviceable life.
3. flow monitoring system of the present invention, in the time that water body is carried out to flow monitoring, is not affected by the factors such as outdoor bad border, flow signal can be exported in indoor host computer in real time, conveniently monitors flow information; Convenient operation personnel's Real Time Observation, saves the resources such as human and material resources; And this system operation working service is easy, and manufacturing cost is low, is easy to promote the use of.
4. flow monitoring system of the present invention is in delivery rate signal, also can be by the display terminal that exports to real-time depth of water R, and in host computer, convenient operation personnel are known correlation parameter.
Brief description of the drawings
Fig. 1 is middle water level feeler primary structure schematic diagram of the present invention;
Fig. 2 is stage-discharge sensor circuit principle schematic of the present invention;
Fig. 3 be jtag interface in the present invention, reset circuit, clock circuit and with microcontroller chip circuit connection diagram;
Fig. 4 is that in the present invention, output circuit schematic diagram is sent in data change;
In Fig. 1: 1. electric wire; 2. circuit board; 3. contact; 4. housing; 5. epoxy resin.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
Embodiment 1: a kind of stage-discharge sensor, referring to Fig. 1 to Fig. 4, comprise water-level detecting bar, this water-level detecting bar comprises housing 4, housing 4 outside surfaces along on its axis direction with 2.0mm equidistantly distance be provided with multiple contacts 3 for being connected with external circuit (circuit board 2), contact 3 is stainless steel screw, and the screw on this stainless steel screw emits and is arranged at housing 4 outside surfaces, as shown in fig. 1.This stage-discharge sensor also comprises and the plurality of voltages comparator circuit of the corresponding connection in above-mentioned contact 3, corresponding that be connected and for receiving the multiplexer circuit of plurality of voltages comparator circuit output voltage, for receiving multiplexer circuit output signal and exporting the governor circuit of water level signal, become and send output circuit for receiving the flow signal that governor circuit exports the data that flow signal is transmitted with plurality of voltages comparator circuit.Above-mentioned multiplexer circuit comprises multiplexer ADG732.Governor circuit comprises clock circuit, reset circuit and the jtag interface circuit of MSP430F149 single-chip microcomputer, all connections corresponding to MSP430F149 single-chip microcomputer, jtag interface is the Program download of MSP430F149 single-chip microcomputer, and simultaneously jtag interface is also as the program debug interface of MSP430F149 single-chip microcomputer; 1,3,5,7,9,13 pins of jtag interface are connected with TD0, TDI, TMS, TCK, DVss, the RST pin of MSP430F149 single-chip microcomputer respectively; Clock circuit comprises low-frequency oscillatory network, high-frequency oscillating circuits, low-frequency oscillatory network comprises the low frequency crystal oscillator Y2 of 32.768KHz, itself and the corresponding connection of XIN, XOUTI/TCLK two pins in MSP430F149 single-chip microcomputer, high-frequency oscillating circuits comprises the high frequency crystal oscillator Y1 of 8MHz, capacitor C 2, C3 with the series loop of this high frequency crystal oscillator Y1 composition, the two ends of this high frequency crystal oscillator Y1 and the corresponding connection of XT2IN, XT2OUT two pins in MSP430F149 single-chip microcomputer.High frequency crystal oscillator Y1, low frequency crystal oscillator Y2 provide respectively 32.768KHz and 8MHz clock for MSP430F149 single-chip microcomputer; Adopt low frequency crystal oscillator Y2 can meet the requirement of low-power consumption, the high frequency oscillator Y1 of 8MHz, can be closed in used time not, to reduce power consumption.Data become send output circuit to comprise and the UTXDO of MSP430F149 single-chip microcomputer, MAX3232 chip, the RS-232 interface that be connected corresponding to this MAX3232 chip that URXDO pin connects; RS-232 interface is mainly used in realizing with host computer and establishes a communications link, and data are realized to the transmission to host computer.Reset circuit is R-C reset circuit, comprises button S, the resistance R 1 of series connection, the capacitor C 1 in parallel with button S, resistance R 1, after button S is in parallel with capacitor C 1 with corresponding connection of RST pin in MSP430F149 single-chip microcomputer.This stage-discharge sensor also comprise corresponding with MSP430F149 single-chip microcomputer connect and for showing the digital display tube group of water level information, demonstration by digital display tube group can, by being presented in digital display tube group via the flow information of this stage-discharge sensor Check processing, be convenient to observe intuitively.Above-mentioned plurality of voltages comparator circuit, multiplexer circuit, MSP430F149 single-chip microcomputer, clock circuit are all printed on circuit board 2, and circuit board 2 is arranged in housing 4 internal cavities, and sealed by epoxy resin 5, enter in it circuit board is caused to damage for anti-sealing.By electric wire 1, the data transmission of detection is gone out.Its plurality of voltages comparator circuit gathers after water level signal, with reference voltage comparison, its output voltage (being comparative result) enters in the input channel of multiplexer ADG732, the data output channel connection corresponding to MSP430F149 single-chip microcomputer of multiplexer ADG732.Above-mentioned multiplexer ADG732 can be encoded into 32 addresses according to 5 binary address line A0, A1, A2, A3 and A4 on it, five bit address choosing ends on its multiplexer ADG732 are connected with P6.3, P6.4, P6.5, P6.6 and the P6.7 pin of MSP430F149 single-chip microcomputer successively, single-chip microcomputer is by changing the input of these IO mouths (P6.3, P6.4, P6.5, P6.6, P6.7 pin) like this, just can change the gating address of ADG732, one of Jiang32 road input switches to public output.Control end CS, the WR of multiplexer ADG732 and EN successively with P3.0, the P3.1 of MSP430F149 single-chip microcomputer and P3.2 be connected, the input that single-chip microcomputer changes P3.0, P3.1 and P3.2 pin just can change the duty of ADG732.
The invention still further relates to a kind of stage-discharge monitoring system, comprise host computer, above-described stage-discharge sensor; This stage-discharge sensor is via the communication connection corresponding to host computer of RS-232/RS-485 converter.
The invention still further relates to a kind of method of utilizing the above stage-discharge monitoring system to carry out stage-discharge monitoring, comprise the steps:
1. the water-level detecting bar of described stage-discharge sensor is laid according to a conventional method to the corresponding position in channel or river to be detected;
2. by the voltage between the different contacts of the plurality of voltages comparator circuit collection of stage-discharge sensor and compare with reference voltage, afterwards result is exported in multiplexer circuit;
3. multiplexer circuit is encoded the voltage signal of input and is inputed in the governor circuit by stage-discharge sensor;
4. the coded signal inputing in it is treated to water signal R by governor circuit, and will in this water signal R substitution following formula, calculate the flow Q of channel to be detected or corresponding position, river:
（1）
Formula (1) also calculates its flow Q; In examination, A is device for channel discharge cross section area; N is channel roughness; I is channel longitudinal gradient; Wherein, lay site fixing in the situation that at stage-discharge sensor, device for channel discharge cross section area A and water signal R are corresponding funtcional relationship, thereby only need measure corresponding water signal, can know the flow of corresponding check point;
5. described governor circuit exports in host computer by gained flow Q via RS-232/RS-485 converter and exports the upper demonstration of charactron group (display terminal) to.
Described formula (1) comprises by following steps and obtaining:
(1) determine channel roughness n, discharge section area A, the channel longitudinal gradient i of channel.
(2) by device for channel discharge cross section area A, the depth of water
rin substitution uniform-flow formula (2):
（2），
Wherein C is for thanking to just coefficient;
(3) by Manning formula substitution uniform-flow formula (2), can obtain:
。
Can find out from this formula, after canal cross section shape, size, longitudinal gradient and roughness are determined, in channel, water flow is only the function of depth of water R.As long as therefore can measure the depth of water R in channel, just can calculate water flow in channel.Suppose that channel is circular pipe, its xsect is circular, and after this circular pipe is determined, its shape, size, longitudinal gradient and roughness all can be determined, its discharge section area
, wherein D is this circular pipe diameter,
for being full of angle; And
, can find out from this formula, after this circular pipe is determined, its D can directly draw, the depth of water can be recorded by this stage-discharge sensor, therefore this formula
in be full of angle
just can draw, therefore discharge section area
just can draw; Therefore flow Q just can draw.For another example suppose that channel xsect is rectangle, it is upper and lower wide is d, and height is L, A=d (L-R); By this formula can draw after this rectangular canal is determined its up and down wide, Gao Junke determine, therefore its A is only the function of R, just can draw discharge section area A therefore only need record depth of water R, therefore
in only need only need to record depth of water R and just can draw the size of Q.
Of the present invention stage-discharge sensor, stage-discharge monitoring system and the stage-discharge detection method tool combining with both have the following advantages:
1. this stage-discharge sensor only needs the lithium battery of 3.3VDC to power, low in energy consumption.
2. the electric current that in use, this stage-discharge sensor proceeds to low-power consumption mode dormant state from inactive state only has 0.7 μ A.
3. this stage-discharge sensor is in the time of external interrupt, and entering active state from dormant state only needs 6 μ S.
It is testing site that the present invention chooses trunk canal, east, Lower Reaches of The Yellow River Henan province people triumph canal irrigation region, and this channel adopts concrete lining.The flow measured value of the present invention and current meter (current meter is the relatively accurate a kind of instrument of current flow rate detection) observation is contrasted, and test figure and error analysis thereof are in table 1.
The contrast of table 1 flow monitoring
From upper table observed result, compared with the flow measured value of flow measurements of the present invention and current meter observation, maximum relative error is 2.89%, and the present invention can meet hydrology code requirement completely, meets the accuracy requirement of hydrologic observation specification.Meanwhile, provide technical support for realizing China's farmland irrigation channel stage-discharge observation automation and numerical information and figure automatic transmission, realize scientific meticulous irrigation for irrigated area, realize using water wisely, improving the level of scientific management provides condition.
Finally point out, what the present embodiment was announced is preferred embodiment, but is not limited to this; those of ordinary skill in the art, very easily according to above-described embodiment, makes different amplifications and variation; but only otherwise depart from spirit of the present invention, all in protection scope of the present invention.
Claims (9)
1. a stage-discharge sensor, comprises water-level detecting bar, it is characterized in that: on described water-level detecting bar, be provided with the contact of some, also comprise
The plurality of voltages comparator circuit of connection corresponding to described contact,
With the multiplexer circuit of the corresponding connection of described plurality of voltages comparator circuit,
For receive described multiplexer circuit output signal delivery rate signal governor circuit,
For receiving flow signal that described governor circuit exports and the data that flow signal is sent to host computer being become and send output circuit.
2. stage-discharge sensor as claimed in claim 1, it is characterized in that: described governor circuit comprises clock circuit, reset circuit and the jtag interface circuit of microcontroller chip, all connections corresponding to described microcontroller chip, and described microcontroller chip is any one in MSP430 series monolithic.
3. stage-discharge sensor as claimed in claim 2, it is characterized in that: described clock circuit comprises low-frequency oscillatory network, high-frequency oscillating circuits, described low-frequency oscillatory network comprises the low frequency crystal oscillator of 10.768KHz～32.768KHz, and described high-frequency oscillating circuits comprises the high frequency crystal oscillator of 450KHz～8MHz; Described multiplexer circuit comprises multiplexer ADG732; Described data become the MAX3232 chip that send output circuit to comprise connection corresponding to described microcontroller chip, with the corresponding RS-232 interface being connected of this MAX3232 chip; Described reset circuit is R-C reset circuit.
4. stage-discharge sensor as claimed in claim 3, is characterized in that: described water-level detecting bar comprises housing, and described contact is arranged on housing outer surface along its axis direction with the equidistant distance of 0.5～5.0mm.
5. stage-discharge sensor as claimed in claim 4, it is characterized in that: described plurality of voltages comparator circuit, multiplexer circuit, microcontroller chip, clock circuit are all positioned on circuit board, described circuit board is arranged in described enclosure interior cavity, and is set its sealed envelope by epoxy.
6. stage-discharge sensor as claimed in claim 5, is characterized in that, described contact is stainless steel screw, and the screw on this stainless steel screw emits and is arranged at described housing outer surface.
7. stage-discharge sensor as claimed in claim 2, is characterized in that: this stage-discharge sensor also comprise corresponding with described microcontroller chip connect and for showing the digital display tube group of flow information.
8. a stage-discharge monitoring system, is characterized in that, comprises host computer, stage-discharge sensor claimed in claim 1; Described stage-discharge sensor is via the connection corresponding to described host computer of RS-232/RS-485 converter.
9. utilize the method that stage-discharge monitoring system is carried out stage-discharge monitoring described in claim 8, it is characterized in that, comprise the steps:
The water-level detecting bar of described stage-discharge sensor is laid according to a conventional method to the corresponding position in channel or river to be detected;
By the voltage between the different contacts of the plurality of voltages comparator circuit collection of stage-discharge sensor and compare with reference voltage, afterwards result is exported in multiplexer circuit;
Multiplexer circuit is encoded the voltage signal of input and is inputed in the governor circuit of stage-discharge sensor;
The coded signal inputing in it is treated to water signal R by governor circuit, and will in this water signal R substitution following formula, calculate the flow Q of channel to be detected or corresponding position, river:
（1）；
In formula (1), A is device for channel discharge cross section area; N is channel roughness; I is channel longitudinal gradient;
Described governor circuit exports in host computer by gained flow Q via RS-232/RS-485 converter and exports display terminal to and shows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410295849.6A CN104132710B (en) | 2014-06-27 | 2014-06-27 | Stage-discharge sensor, stage-discharge monitoring system and stage-discharge monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410295849.6A CN104132710B (en) | 2014-06-27 | 2014-06-27 | Stage-discharge sensor, stage-discharge monitoring system and stage-discharge monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104132710A true CN104132710A (en) | 2014-11-05 |
| CN104132710B CN104132710B (en) | 2018-05-18 |
Family
ID=51805481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410295849.6A Expired - Fee Related CN104132710B (en) | 2014-06-27 | 2014-06-27 | Stage-discharge sensor, stage-discharge monitoring system and stage-discharge monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104132710B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535134A (en) * | 2014-12-29 | 2015-04-22 | 太原理工大学 | Millimeter-level digital type water level sensor detecting method |
| CN108460483A (en) * | 2018-02-09 | 2018-08-28 | 中国水利水电科学研究院 | A kind of quantitative inversion method of natural river course flow |
| CN109781045A (en) * | 2019-01-28 | 2019-05-21 | 江阴众和电力仪表有限公司 | A kind of LPS Linear displacement transducer probing shell and its processing technology |
| CN110567548A (en) * | 2019-10-11 | 2019-12-13 | 安徽恒泰电气科技股份有限公司 | Mining intelligent liquid level sensor |
| CN111878712A (en) * | 2020-07-07 | 2020-11-03 | 恒天益科技（深圳）有限公司 | Method and system for monitoring uniform flow of pipe network |
| CN111985164A (en) * | 2020-07-10 | 2020-11-24 | 江苏省海洋资源开发研究院(连云港) | River flow prediction method based on fluid power and piecewise Manning formula |
| CN113029254A (en) * | 2021-04-20 | 2021-06-25 | 河海大学 | Measuring device and measuring method for depth and flow of water in pipeline |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3911744A (en) * | 1974-04-10 | 1975-10-14 | Liquidometer Corp | Liquid level gauging apparatus |
| JPS5984121A (en) * | 1982-11-05 | 1984-05-15 | Unyusho Kowan Gijutsu Kenkyusho | Water contact signal processing type stepwise crest measuring device |
| CN1831493A (en) * | 2006-04-10 | 2006-09-13 | 中国科学院电工研究所 | Liquid nitrogen liquid level measuring device for high voltage surperconducting power equipment |
| CN2852066Y (en) * | 2005-11-04 | 2006-12-27 | 栾继军 | Ultrasonic Doppler open channel flowmeter |
| CN101464481A (en) * | 2008-12-31 | 2009-06-24 | 中国海洋大学 | Resistivity monitoring method and apparatus for sea floor erosion/deposition dynamic process |
| CN201517936U (en) * | 2009-09-17 | 2010-06-30 | 中国船舶重工集团公司第七一九研究所 | Time division multiplex multi-channel electric contact liquid level detection circuit |
| US20120035880A1 (en) * | 2003-03-31 | 2012-02-09 | Al-Misfer Adel S | Measurement of molten sulfur level in receptacles |
| CN202420602U (en) * | 2012-01-13 | 2012-09-05 | 武汉世纪水元科技股份有限公司 | Water level automatic measuring device |
| CN204007787U (en) * | 2014-06-27 | 2014-12-10 | 华北水利水电大学 | Stage-discharge sensor and stage-discharge monitoring system |
-
2014
- 2014-06-27 CN CN201410295849.6A patent/CN104132710B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3911744A (en) * | 1974-04-10 | 1975-10-14 | Liquidometer Corp | Liquid level gauging apparatus |
| JPS5984121A (en) * | 1982-11-05 | 1984-05-15 | Unyusho Kowan Gijutsu Kenkyusho | Water contact signal processing type stepwise crest measuring device |
| US20120035880A1 (en) * | 2003-03-31 | 2012-02-09 | Al-Misfer Adel S | Measurement of molten sulfur level in receptacles |
| CN2852066Y (en) * | 2005-11-04 | 2006-12-27 | 栾继军 | Ultrasonic Doppler open channel flowmeter |
| CN1831493A (en) * | 2006-04-10 | 2006-09-13 | 中国科学院电工研究所 | Liquid nitrogen liquid level measuring device for high voltage surperconducting power equipment |
| CN101464481A (en) * | 2008-12-31 | 2009-06-24 | 中国海洋大学 | Resistivity monitoring method and apparatus for sea floor erosion/deposition dynamic process |
| CN201517936U (en) * | 2009-09-17 | 2010-06-30 | 中国船舶重工集团公司第七一九研究所 | Time division multiplex multi-channel electric contact liquid level detection circuit |
| CN202420602U (en) * | 2012-01-13 | 2012-09-05 | 武汉世纪水元科技股份有限公司 | Water level automatic measuring device |
| CN204007787U (en) * | 2014-06-27 | 2014-12-10 | 华北水利水电大学 | Stage-discharge sensor and stage-discharge monitoring system |
Non-Patent Citations (2)
| Title |
|---|
| 王艳菊等: "基于电容式传感器的储液智能化测量系统", 《微计算机信息》 * |
| 韩宇平等: "北运河河流生态需水分段法研究", 《华北水利水电大学学报(自然科学版)》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104535134A (en) * | 2014-12-29 | 2015-04-22 | 太原理工大学 | Millimeter-level digital type water level sensor detecting method |
| CN104535134B (en) * | 2014-12-29 | 2017-10-20 | 太原理工大学 | A kind of grade digital water level sensor detecting method |
| CN108460483A (en) * | 2018-02-09 | 2018-08-28 | 中国水利水电科学研究院 | A kind of quantitative inversion method of natural river course flow |
| CN108460483B (en) * | 2018-02-09 | 2021-03-12 | 中国水利水电科学研究院 | Quantitative inversion method for natural river flow |
| CN109781045A (en) * | 2019-01-28 | 2019-05-21 | 江阴众和电力仪表有限公司 | A kind of LPS Linear displacement transducer probing shell and its processing technology |
| CN110567548A (en) * | 2019-10-11 | 2019-12-13 | 安徽恒泰电气科技股份有限公司 | Mining intelligent liquid level sensor |
| CN110567548B (en) * | 2019-10-11 | 2024-04-30 | 安徽恒泰电气科技股份有限公司 | Mining intelligent liquid level sensor |
| CN111878712A (en) * | 2020-07-07 | 2020-11-03 | 恒天益科技（深圳）有限公司 | Method and system for monitoring uniform flow of pipe network |
| CN111985164A (en) * | 2020-07-10 | 2020-11-24 | 江苏省海洋资源开发研究院(连云港) | River flow prediction method based on fluid power and piecewise Manning formula |
| CN111985164B (en) * | 2020-07-10 | 2024-06-18 | 江苏省海洋资源开发研究院(连云港) | River flow prediction method based on hydrodynamic force and sectional Manning formula |
| CN113029254A (en) * | 2021-04-20 | 2021-06-25 | 河海大学 | Measuring device and measuring method for depth and flow of water in pipeline |
| CN113029254B (en) * | 2021-04-20 | 2023-03-14 | 河海大学 | Method for measuring depth and flow of pipeline inflow water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104132710B (en) | 2018-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104132710A (en) | Water level flow sensor, water level flow monitoring system and water level flow monitoring method | |
| CN109506727B (en) | Ultrasonic flow measurement method and low-power consumption ultrasonic flowmeter | |
| CN207528277U (en) | Plug-in type ultrasonic flowmeter and Flow Measuring System | |
| CN203224283U (en) | Liquid flow field calibration device | |
| CN105547957A (en) | Method for calculating suction of infiltration wetting front of soil and spurt volume of rainfall | |
| CN103278218A (en) | Flow monitoring device used for mechanical water meter | |
| CN203011496U (en) | Vortex street flow detection experiment device | |
| CN204007787U (en) | Stage-discharge sensor and stage-discharge monitoring system | |
| CN108387277B (en) | Irrigation area integrated water level flow wireless measurement method and device | |
| CN104567831B (en) | Easily precipitated water quality open channel flow measuring instrument and measurement method thereof | |
| CN103375682A (en) | Intelligent GIS pipe network system | |
| CN103674169A (en) | Method for automatically measuring pipe-free embedded type groundwater level and water level changes | |
| CN207528302U (en) | It is a kind of to carry out level monitoring device using ultrasonic sensor | |
| CN204008369U (en) | Air content continuous measuring device | |
| CN202382892U (en) | Efficiency detection instrument of water chilling unit | |
| CN205373784U (en) | Balanced calculating system of fluid meter utensil and fluid | |
| CN203630059U (en) | Nuclear magnetic resonance technology-based online crude oil moisture content monitor | |
| CN109977618B (en) | Modularized design method of cathode protection remote detection device | |
| CN204788568U (en) | Water level measurement device | |
| CN208443689U (en) | A kind of on-site measurement drilling fluid density device | |
| CN203364901U (en) | Flow monitoring device used for mechanical water meter | |
| CN205301360U (en) | Measurement system more than one minute based on acoustics doppler velocity of flow section plotter | |
| CN202177634U (en) | Flow velocity and direction instrument | |
| CN105784032B (en) | Ultrasonic water meter drip metering method | |
| CN201876500U (en) | Self-checking earth resistance tester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180518 Termination date: 20190627 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |