CN103728463B - Ultrasonic wind meter and measuring method - Google Patents

Ultrasonic wind meter and measuring method Download PDF

Info

Publication number
CN103728463B
CN103728463B CN201310747370.7A CN201310747370A CN103728463B CN 103728463 B CN103728463 B CN 103728463B CN 201310747370 A CN201310747370 A CN 201310747370A CN 103728463 B CN103728463 B CN 103728463B
Authority
CN
China
Prior art keywords
module
ultrasound wave
ultrasonic
main control
control module
Prior art date
Application number
CN201310747370.7A
Other languages
Chinese (zh)
Other versions
CN103728463A (en
Inventor
张自嘉
陆健
张丽萍
李贺
Original Assignee
南京信息工程大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 南京信息工程大学 filed Critical 南京信息工程大学
Priority to CN201310747370.7A priority Critical patent/CN103728463B/en
Publication of CN103728463A publication Critical patent/CN103728463A/en
Application granted granted Critical
Publication of CN103728463B publication Critical patent/CN103728463B/en

Links

Abstract

The invention provides a kind of ultrasonic wind meter and measuring method, this anemometer comprises casing, wind speed and direction measurement module, correction for direction module and main control module.The present invention adopts a ultrasonic transmitter and three ultrasonic receivers, making circuit structure more simple, only by once sending ultrasound wave, just can measure wind speed and direction.The present invention has correction for direction module, when equipment is installed without the need to considering the problem of equipment installation direction, in measuring process, can realize being adapted to direction of measurement the direction pre-established, simplifying the flow process of installation, improve the accuracy of measurement.The ultrasonic wind meter circuit design that invention provides is simple, simple installation, and measuring method is simple, and measurement result is accurate.

Description

Ultrasonic wind meter and measuring method
technical field:
The present invention relates to wind speed and direction fields of measurement, particularly relate to the measuring method of a kind of ultrasonic wind meter and wind speed and direction.
background technology:
Anemoscope all plays an important role at meteorology, civil aviaton, highway, agricultural and new energy field.Current ultrasonic type anemoscope has become the main flow of anemoscope application and development.
Current ultrasonic type anemoclinograph is mainly based on the measuring principle of time difference method and phase difference method, device in the design, often need ultrasonic sensor to be placed on the direction identical with geographical north and south, thing, when user uses, often need to correct according to the direction preset and geographical north and south, east-west direction to install, if installation direction generation error, then measurement result can be caused to make a mistake.Meanwhile, existing ultrasonic wind velocity indicator adopts timesharing principle mostly, and namely a pair ultrasonic transducer sends and Received signal strength in turn, needs to measure often, and circuit structure is complicated, often because repetitive measurement causes measurement result to have error.
summary of the invention:
The object of the present invention is to provide that a kind of circuit structure is simple, simple installation, measurement result ultrasonic wind meter accurately.
Another object of the present invention is to the measuring method providing a kind of wind speed and direction, the method measuring process is easy, result is accurate.
Technical scheme of the present invention is as follows:
A kind of ultrasonic wind meter comprises casing, wind speed and direction measurement module, correction for direction module and main control module,
Described casing comprises mounting box and lower mounting box, and upper mounting box is connected by support with lower mounting box, is provided with installation column, for supporting fixation below described lower mounting box;
Wind speed and direction measurement module comprises a ultrasound wave emission sensor and three ultrasound wave receiving sensors, and they are connected with main control module respectively; Described correction for direction module is also connected with main control module;
Described main control module and correction for direction module are placed in lower mounting box, three ultrasound wave receiving sensors are embedded in the also distribution in equilateral triangle in lower mounting box, ultrasound wave emission sensor is embedded in mounting box, ultrasound wave emission sensor is positioned at directly over three ultrasound wave receiving sensors, and correspondence is positioned at the center of the equilateral triangle that three ultrasound wave receiving sensors are formed.
Described main control module comprises CPLD/FPGA controller, power module, RS485 interface module, ultrasonic drive circuit, temperature compensation module, signal conditioning circuit and threshold value comparator circuit, described power module, RS485 interface module, temperature compensation module, ultrasonic drive circuit and threshold value comparator circuit are all connected with CPLD/FPGA controller, described power module also with ultrasonic drive circuit model calling, described ultrasound wave emission sensor and ultrasonic drive circuit model calling, described ultrasound wave receiving sensor is connected with signal conditioning circuit.
Correction for direction module comprises a magnetometric sensor.Ultrasound wave emission sensor and ultrasound wave receiving sensor have certain radiation direction angle of release.
Utilize above-mentioned anemometer to carry out the method for wind speed and direction measurement, comprise the following steps:
1) main control module obtains ambient temperature data, determines temperature compensation according to calculating;
2) main control module generation signal makes ultrasound wave emission sensor send pulse signal, and starts the counter corresponding with ultrasound wave receiving sensor in main control module simultaneously;
3) when ultrasonic pulse signal is received by three ultrasound wave receiving sensors respectively, the signal received carries out amplification process through respective follow-up signal modulate circuit respectively, and produce each self-corresponding counter interruption stop signal through threshold value comparator circuit, obtain ultrasonic pulse respectively and received institute's elapsed time from being sent to by each road ultrasonic receiver;
4) main control module carries out wind speed and direction correction by magnetometric sensor acquisition data, and obtains surveyed wind speed and direction;
5) data are exported by RS485 interface module by main control module.
the present invention has following beneficial effect:
1. ultrasonic wind meter of the present invention adopts a ultrasonic transmitter and three ultrasonic receivers, makes circuit structure simpler.Only by once sending ultrasound wave in measuring process, just wind speed and direction can be measured.
2. ultrasonic wind meter of the present invention has correction for direction module, can, when equipment is installed without the need to considering the problem of equipment installation direction, in measuring process, can realize being adapted to direction of measurement the direction pre-established, simplify the flow process of installation, improve the accuracy of measurement.
3. ultrasonic wind meter circuit design of the present invention is simple, cost is low, and circuit adopts modular design.
4. environmental suitability of the present invention is strong.Upper mounting box can block sleet and sand and dust, reduces foreign matter to the impact of measuring wind speed, goes up the interference that mounting box also can stop the wind in vertical direction simultaneously, improve whole system measuring accuracy.
accompanying drawing illustrates:
Fig. 1 is the structural representation of ultrasonic wind meter.
The plan structure schematic diagram of Fig. 2 ultrasonic wind meter.
Fig. 3 is main control module circuit composition frame chart.
Fig. 4 utilizes magnetometric sensor to be corrected surveying parameter by wind speed and direction measuring device of the present invention, thus draws the Method And Principle schematic diagram of the wind speed and direction parameter under actual environment condition.
Fig. 5 is that ultrasound wave emission sensor of the present invention launches driving circuit.
Fig. 6 is ultrasound wave sensor-lodging modulate circuit of the present invention and threshold value comparator circuit schematic diagram.
Fig. 7 is correction for direction modular circuit schematic diagram of the present invention.
Fig. 8 is temperature-compensation circuit schematic diagram.
In figure: the upper mounting box of 1-; 21-support; 22-support; 23-support; 31-ultrasound wave receiving sensor A; 32-ultrasound wave receiving sensor B; 33-ultrasound wave receiving sensor C; 4-ultrasound wave emission sensor; 5. descend mounting box; 6. column is installed.
embodiment:
Below in conjunction with the drawings and specific embodiments, the present invention will be described.
As shown in Figure 1 and Figure 2, ultrasonic wind meter of the present invention comprises casing, wind speed and direction measurement module, correction for direction module and main control module.
Casing comprises mounting box 1 and lower mounting box 5, and upper mounting box 1 is connected by support 3 with lower mounting box 5, is connected to and installs on column 6 bottom lower mounting box 5, installs column for supporting fixation.Upper mounting box 1 is oppositely arranged with lower mounting box 5, and is connected as one by three supports.
Wind speed and direction measurement module comprises a ultrasound wave emission sensor 4 and three ultrasound wave receiving sensors A, B, C, and they are connected with main control module respectively; Correction for direction module is also connected with main control module;
Main control module and correction for direction module are placed in lower mounting box 5, three ultrasound wave receiving sensors are embedded in the also distribution in equilateral triangle in lower mounting box 5, ultrasound wave emission sensor 4 is embedded in mounting box 1, ultrasound wave emission sensor 4 is positioned at directly over three ultrasound wave receiving sensors, and correspondence is positioned at the center of the equilateral triangle that three ultrasound wave receiving sensors are formed.Its orthogonal projection is positioned at leg-of-mutton center.
As shown in Figure 3, main control module comprises: CPLD/FPGA controller, power module, RS485 interface module, ultrasonic drive circuit, temperature compensation module, signal conditioning circuit and threshold value comparator circuit, and described power module, RS485 interface module, temperature compensation module, ultrasonic drive circuit and threshold value comparator circuit are all connected with CPLD/FPGA controller.
Ultrasonic transmitter in the present embodiment/ultrasonic receiver is selected to need to have certain radiation direction angle of release, with the ultrasonic pulse signal ensureing to be sent by ultrasonic transmitter can be reliable and stable received by ultrasonic receiver.
The ultrasound wave transmitting/receiving sensor selected in the present invention has higher sensitivity and has certain angle of release, adopts model to be the transmitting-receiving integrated sensor of DYA-125-02A, forms wind speed and direction measurement module.
In main control module of the present invention, CPLD/FPGA controller adopts the CPLD chip EPM240T100C5 of altera corp, its stable performance, low-power consumption, cost performance are high, having can the characteristic of parallel processing, can realize processing the signal of 3 road ultrasound wave modulate circuits simultaneously.
Above-mentioned ultrasonic drive circuit (namely ultrasound wave emission sensor launches driving circuit) is given in Fig. 5.In figure, QU1 is connected with the I/O pin of controller CPLD, the break-make of Signal-controlled switch triode Q1 is produced by controller CPLD, thus make the secondary of transformer T1 produce the DC pulse voltage of about 120V, drive ultrasonic transmitter FS1 to produce one section of ultrasonic pulse signal.
Above-mentioned signal conditioning circuit (i.e. ultrasound wave sensor-lodging modulate circuit) and threshold value comparator circuit schematic diagram is given in Fig. 6.In figure, ultrasonic receiver FS2 receives the ultrasonic signal that ultrasonic transmitter sends, signal carries out amplification process via the two-stage amplifying circuit that operational amplifier U1 is formed and produces subsequent conditioning circuit required voltage signal, and the threshold value comparator circuit delivering to comparer U2 formation produces timer interrupt signal, the port that look-at-me feeding CPLD and INT2 is connected processes.
As shown in Figure 7, adopt model to be that the magnetometric sensor of LSM303DLM forms correction for direction module in the present invention, this chip adopts I2C agreement to carry out data transmission, has higher data transmission rate.Its circuit theory diagrams as shown in Figure 7.This chip controls port is directly connected with CPLD with FPDP pin, and CPLD produces interruption control signal by INT1 and INT2 pin and reads current installation position angular data, and direction sensor passes through I 2data are sent into CPLD and are carried out process realization to correction for direction by C interface.
In anemoscope measuring process, master controller needs the current ambient temperature data of acquisition to carry out temperature compensation guarantee measuring accuracy to measuring unit in real time.Temperature compensation module in the present invention mainly comprises temperature sensing circuit and low temperature compensation circuit, temperature sensing circuit adopts digital temperature sensor DS18B20 chip to form detection module, its low temperature temperature-measuring range can reach-55 degrees Celsius, temperature measurement error is less than 0.5 degree Celsius, measuring accuracy is high, in use without any need for peripheral cell, temperature measurement circuit is simple, and it is directly connected with CPLD controller.Figure 8 shows that low temperature compensation circuit, heating wire H1 is positioned in mounting box and lower mounting box respectively, realize heating the region between upper and lower mounting box, compensating circuit control end Con1 is directly connected with CPLD, controls heating wire work by gauge tap triode Q5 break-make.
Ultrasonic wind meter of the present invention carries out the measuring method of wind speed and direction, specifically comprises the following steps:
Be two coordinate systems in Fig. 4, coordinate system when dotted line is actual installation, solid line is the coordinate system that will be adapted to.In following steps, step (4) and step (5) carry out calculation of wind speed wind direction value for solid line coordinate system, and other carry out according to dotted line coordinate system.
(1) master controller CPLD/FPGA obtains temperature compensation module data, judges whether to need to carry out temperature compensation, and making the velocity of sound in measuring process, maintain steady state value all the time by compensation is 340m/s.The computing formula of temperature compensation is as follows:
Wherein for the velocity of sound, for current ring heats angle value;
(2) producing signal by master controller CPLD/FPGA makes ultrasonic drive circuit module drive ultrasonic transmitter send pulse signal, and start the counter corresponding with 3 ultrasonic receivers of master controller CPLD/FPGA inside, when ultrasonic pulse signal is received by the ultrasonic receiver in lower mounting box respectively simultaneously;
(3) signal that ultrasonic receiver receives carries out amplification process through respective follow-up signal modulate circuit respectively, and produce each self-corresponding counter interruption stop signal through threshold value comparator circuit, obtain ultrasonic pulse respectively and received institute elapsed time t from being sent to by each road ultrasonic receiver, by calculating the air speed value component that can obtain in equilateral triangle structure that 3 ultrasonic receivers form on each limit:
Wherein for air speed value on the equilateral triangle structure top that 3 ultrasonic receivers are formed, c is the velocity of sound, t for ultrasonic pulse signal from ultrasonic transmitter be sent to by ultrasonic receiver receive time of propagating, for the angle, maximum cross-section of the space structure that ultrasonic transmitter and 3 ultrasonic receivers are formed.
(4) master controller is carried out wind speed and direction correction by magnetometric sensor acquisition corresponding data and is obtained surveyed wind speed and direction;
(5) data are sent by RS485 interface module by last master controller.
Fig. 4 utilizes magnetometric sensor to be corrected surveying parameter by wind speed and direction measuring device of the present invention, thus draws the Method And Principle schematic diagram of the wind speed and direction parameter under actual environment condition.Geographic orientation pointed when wherein X, Y dotted line coordinate is the installation of whole wind speed and direction measuring device, X, Y dotted line coordinate is take sensors A as the coordinate system that assigned direction is set up.Solid line coordinate is the coordinate on actual geographic north and south, east-west direction, wherein angle r is the deflection angle on the magnetometric sensor actual installation direction of measuring and geographical north and south, east-west direction, and in Fig. 4, A, B, C are 3 ultrasonic receivers in Fig. 1 schematic diagram on lower mounting box.Angle a is the angle, maximum cross-section of the space structure that ultrasonic transmitter and 3 ultrasonic receivers are formed.
As shown in Figure 4, if the ultrasonic pulse signal that sent by the ultrasonic transmitter in upper mounting box arrives the time that ultrasonic receiver A, B, C in lower mounting box propagate be: .
According to formula , the wind speed component value of air speed value on each limit of equilateral triangle that A, B, C form can be drawn:
According to equilateral triangle fundamental theorem, the wind speed component value of the wind direction shown in figure in installation direction X, Y-direction can be obtained :
According to the data that magnetometric sensor reads, actual geographic north and south, the direction of thing and the angle of deviation r of installation direction can be obtained, the air speed value component of actual wind can be drawn according to this deflection angle , and can wind direction be drawn according to this air speed value air quantity:
According to the principle of Vector modulation, the value of actual wind speed and wind direction can be drawn:

Claims (4)

1. a ultrasonic wind meter, is characterized in that: comprise casing, wind speed and direction measurement module, correction for direction module and main control module,
Described casing comprises mounting box and lower mounting box, and upper mounting box is connected by support with lower mounting box, is provided with installation column, for supporting fixation below described lower mounting box;
Wind speed and direction measurement module comprises a ultrasound wave emission sensor and three ultrasound wave receiving sensors, and they are connected with main control module respectively; Described correction for direction module is also connected with main control module;
Described main control module and correction for direction module are placed in lower mounting box, three ultrasound wave receiving sensors are embedded in the also distribution in equilateral triangle in lower mounting box, ultrasound wave emission sensor is embedded in mounting box, ultrasound wave emission sensor is positioned at directly over three ultrasound wave receiving sensors, and correspondence is positioned at the center of the equilateral triangle that three ultrasound wave receiving sensors are formed;
Described main control module comprises CPLD/FPGA controller, power module, RS485 interface module, ultrasonic drive circuit, temperature compensation module, signal conditioning circuit and threshold value comparator circuit, described power module, RS485 interface module, temperature compensation module, ultrasonic drive circuit and threshold value comparator circuit are all connected with CPLD/FPGA controller, described power module is also connected with ultrasonic drive circuit, described ultrasound wave emission sensor is connected with ultrasonic drive circuit, and described ultrasound wave receiving sensor is connected with signal conditioning circuit.
2. utilize the anemometer described in claim 1 to carry out a method for wind speed and direction measurement, comprise the following steps:
(1) main control module obtains ambient temperature data, determines temperature compensation according to calculating;
(2) main control module generation signal makes ultrasound wave emission sensor send pulse signal, and starts the counter corresponding with ultrasound wave receiving sensor in main control module simultaneously;
(3) when ultrasonic pulse signal is received by three ultrasound wave receiving sensors respectively, the signal received carries out amplification process through respective follow-up signal modulate circuit respectively, and produce each self-corresponding counter interruption stop signal through threshold value comparator circuit, obtain ultrasonic pulse respectively and received institute's elapsed time from being sent to by each road ultrasonic receiver;
(4) main control module carries out wind speed and direction correction by magnetometric sensor acquisition data, and obtains surveyed wind speed and direction;
(5) data are exported by RS485 interface module by main control module.
3. method as claimed in claim 2, it is characterized in that: in described (1), main control module obtains the ambient temperature data of current temperature compensation module, determines whether that needs carry out corresponding temperature compensation, and making the velocity of sound in measuring process, maintain steady state value all the time by compensation is 340m/s; The computing formula of temperature compensation is as follows:
ν c=331.3+0.606·T c
Wherein ν cfor the velocity of sound, T cfor current environmental temperature value.
4. method as claimed in claim 2, is characterized in that: in described (4), and the ultrasonic pulse signal sent by measuring the ultrasound wave emission sensor that obtains arrives the time that three road ultrasound wave receiving sensor A, B, C propagate and is: t a, t b, t c, angle r is the deflection angle on the magnetometric sensor actual installation direction of measuring and geographical north and south, east-west direction,
C is the velocity of sound, can draw the wind speed component value of air speed value on each limit of equilateral triangle that ultrasound wave receiving sensor A, B, C form, and α is the angle, maximum cross-section of the space structure that ultrasonic transmitter and three ultrasonic receivers are formed:
V A C = 3 · ( c + 1 t A ) · cos a
V C B = 3 · ( c + 1 t C ) · cos a
V A B = 3 · ( c + 1 t B ) · cos a
According to equilateral triangle fundamental theorem, the wind speed component value V of wind direction in installation direction X, Y-direction can be obtained x, V y:
V X = 1 2 · V A C + 1 2 · V C B + V A B
V Y = 3 2 · V A C + 3 2 · V C B
According to the data that magnetometric sensor reads, actual geographic north and south, the direction of thing and the angle of deviation r of installation direction can be obtained, the air speed value component V' of actual wind can be drawn according to this deflection angle x, V y', and can wind direction be drawn according to this air speed value air quantity:
V′ X=V X·cosr
V′ Y=V Y·cosr
According to the principle of Vector modulation, the value of actual wind speed and wind direction can be drawn:
V = ( V X ′ ) 2 + ( V Y ′ ) 2
θ = a r c t a n ( V X ′ V Y ′ ) .
CN201310747370.7A 2013-12-31 2013-12-31 Ultrasonic wind meter and measuring method CN103728463B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310747370.7A CN103728463B (en) 2013-12-31 2013-12-31 Ultrasonic wind meter and measuring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310747370.7A CN103728463B (en) 2013-12-31 2013-12-31 Ultrasonic wind meter and measuring method

Publications (2)

Publication Number Publication Date
CN103728463A CN103728463A (en) 2014-04-16
CN103728463B true CN103728463B (en) 2015-12-09

Family

ID=50452625

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310747370.7A CN103728463B (en) 2013-12-31 2013-12-31 Ultrasonic wind meter and measuring method

Country Status (1)

Country Link
CN (1) CN103728463B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103995146B (en) * 2014-04-30 2016-03-30 北京爱信德科技有限公司 Ultrasound wind apparatus and method
CN104897924B (en) * 2015-04-30 2017-11-07 中国科学技术大学 A kind of two-dimentional reflecting type ultrasonic anemoclinograph and measuring method
CN104897925B (en) * 2015-06-24 2017-11-24 吉林大学 Ultrasonic wind speed and direction measuring device and measuring method
CN105223380A (en) * 2015-10-19 2016-01-06 国家电网公司 Transmission line of electricity ultrasound wave self-correcting wind speed and direction monitoring system
CN106405146B (en) * 2016-09-10 2019-01-11 浙江大学 A kind of speed and wind direction measuring method for wind based on ultrasonic resonance principle
CN109425752A (en) * 2017-08-23 2019-03-05 高雄应用科技大学 Ultrasonic wind speed measuring device
CN109813930B (en) * 2019-03-12 2020-12-22 吉林大学 Wind speed and direction measuring method based on reflective ultrasonic sensor array
CN109991441A (en) * 2019-05-06 2019-07-09 南京俊禄科技有限公司 A kind of automatic calibrating method of wind direction speed instrument
CN110346600B (en) * 2019-08-21 2021-04-06 南京信息工程大学 Ultrasonic wind speed and wind direction measuring method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890488A (en) * 1988-03-03 1990-01-02 Simecsol Ultrasonic anemometer
CN101750516A (en) * 2009-12-24 2010-06-23 北京汉能华科技有限公司 Anemometer and method for measuring wind speed and wind direction
CN102175887A (en) * 2011-01-26 2011-09-07 南京信息工程大学 Mobile ultrasonic anemoclinograph and method for measuring wind speed and direction
CN202133677U (en) * 2011-05-13 2012-02-01 西南交通大学 Air pressure correction ultrasonic anemoclinograph framework
JP5029993B2 (en) * 2008-03-24 2012-09-19 光進電気工業株式会社 Ultrasonic wind speed device
CN203643467U (en) * 2013-12-31 2014-06-11 南京信息工程大学 Ultrasonic wind meter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890488A (en) * 1988-03-03 1990-01-02 Simecsol Ultrasonic anemometer
JP5029993B2 (en) * 2008-03-24 2012-09-19 光進電気工業株式会社 Ultrasonic wind speed device
CN101750516A (en) * 2009-12-24 2010-06-23 北京汉能华科技有限公司 Anemometer and method for measuring wind speed and wind direction
CN102175887A (en) * 2011-01-26 2011-09-07 南京信息工程大学 Mobile ultrasonic anemoclinograph and method for measuring wind speed and direction
CN202133677U (en) * 2011-05-13 2012-02-01 西南交通大学 Air pressure correction ultrasonic anemoclinograph framework
CN203643467U (en) * 2013-12-31 2014-06-11 南京信息工程大学 Ultrasonic wind meter

Also Published As

Publication number Publication date
CN103728463A (en) 2014-04-16

Similar Documents

Publication Publication Date Title
CN102722178B (en) Electric field measuring obstacle avoidance system and method for live wire routing inspection of unmanned aerial vehicle
CN103163324B (en) A kind of wind energy turbine set three-dimensional ultrasonic wind speed system for detecting temperature and measuring method thereof
CN203744915U (en) System for monitoring dam body
CN102538742B (en) Deformation measurement and early warning system and method integrating satellite positioning and accelerometer
CN103630705B (en) A kind of measuring method utilizing solid state two dimensional wind speed and direction measuring instrument
CN102353481B (en) Method and device for complementing temperature and pressure of pressure sensor based on two-dimensional orthogonal function
Han et al. Two-dimensional ultrasonic anemometer using the directivity angle of an ultrasonic sensor
CN101957442A (en) Sound source positioning device
CN102243294A (en) Nonlinear calibrating method and device for foundation microwave radiometer
CN103472503B (en) Sonde and upper air wind finding method based on INS
CN105628117A (en) Radar channel flow measurement system and method
CN102997846A (en) Full-airplane horizontal measurement method based on work space measurement location system
CN101692097A (en) Anemoclinograph wind meter
CN104183155A (en) Device for detecting parking space in parking lot and detection method
CN102607498B (en) Frozen soil and dry soil layer measuring transducer
CN104040788A (en) Azimuth correction adjustment-based electric tiled antenna and electric tiled antenna system
CN103090812A (en) System and method for tunnel deformation monitoring
CN201355339Y (en) Calibration device of automatic atmospheric particulate matter monitoring system
CN202178871U (en) Positioning system for indoor airships
CN204101033U (en) A kind of antenna for base station angle of declination dynamic measurement system
CN206039247U (en) Bridge structures health monitoring system
CN203949708U (en) A kind of radar type water-level gauge based on acceleration transducer correction water level value
CN204142233U (en) A kind of intelligent land area measuring device
CN104239959A (en) Geographical disaster prediction system
CN201589784U (en) Parallel three-dimensional wind-measuring sensor

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151209

Termination date: 20181231

CF01 Termination of patent right due to non-payment of annual fee