CN105974423A - Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof - Google Patents

Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof Download PDF

Info

Publication number
CN105974423A
CN105974423A CN201610272144.1A CN201610272144A CN105974423A CN 105974423 A CN105974423 A CN 105974423A CN 201610272144 A CN201610272144 A CN 201610272144A CN 105974423 A CN105974423 A CN 105974423A
Authority
CN
China
Prior art keywords
ultrasonic
range finder
power transmission
transmission line
basal plane
Prior art date
Application number
CN201610272144.1A
Other languages
Chinese (zh)
Inventor
程健
李军
陈柱
史明
史一明
吴嘉珉
Original Assignee
中国科学技术大学先进技术研究院
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 中国科学技术大学先进技术研究院 filed Critical 中国科学技术大学先进技术研究院
Priority to CN201610272144.1A priority Critical patent/CN105974423A/en
Publication of CN105974423A publication Critical patent/CN105974423A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06Systems determining position data of a target
    • G01S17/08Systems determining position data of a target for measuring distance only
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/497Means for monitoring or calibrating

Abstract

The invention relates to a power transmission line sag measurement method based on ultrasonic distance measuring and a system thereof. The system comprises an ultrasonic range finder fixed on a power transmission line. An ultrasonic emission head in the ultrasonic range finder points to a downward direction. A ground where the pointing of the emission head is arranged to be a level base surface. The ultrasonic range finder emits an ultrasonic wave to the level base surface and collects and receives the ultrasonic wave reflected by the level base surface. A collected signal is calculated and processed and correlation information is fed back to a monitoring terminal. The monitoring terminal receives the information and then carries out further processing, and outputs alarm information. The ultrasonic range finder is fixed to the power transmission line. An ultrasonic transmitting terminal in the ultrasonic range finder vertically points to a downward direction. An underface ground is provided with the level base surface so as to ensure that an ultrasonic echo can be received. Detection reliability is increased. Through using an ultrasonic distance measuring method to measure a power transmission conductor sag, the price of the ultrasonic range finder is low so that large-scale use can be achieved.

Description

Power transmission line sag measuring method based on ultrasonic ranging and system
Technical field
The present invention relates to power transmission technical field, be specifically related to a kind of power transmission line sag based on ultrasonic ranging and measure Method and system.
Background technology
The sag of high voltage transmission line is the important indicator that line security runs, and the size of power transmission line sag should control necessarily In the range of, if the requirement that the sag of power transmission line is against regulation, when sag is excessive, even destroy the shaft tower knot setting up wire Structure or wind cycloid cause phase fault, produce electric arc, electric spark ignites combustible around, the therefore sag inspection of high voltage transmission line Survey the safe transport to whole electric energy to be particularly important.For above-mentioned technical problem, application number 201310261898.3 is announced A kind of high voltage electricity transmission conductive wire sag measuring device and the method measuring sag, it uses microwave radar range sensor, Though power transmission line sag can be measured, but the ultrasonic range finder cost comparing the design method to exceed much, is unfavorable for product Large-scale use;When additionally it is measured at the scene, due to the factor such as with a varied topography, it may be caused can not effectively to receive thunder Reach echo, thus cause false alarm.
Summary of the invention
It is an object of the invention to: a kind of power transmission line sag measuring method based on ultrasonic ranging and system are provided, can pin Different terrain is detected in real time, it is ensured that while certainty of measurement, reduce cost and put into.
For achieving the above object, the technical solution used in the present invention is: power transmission line sag based on ultrasonic ranging is measured Method, this sag measuring method comprises the steps:
A), choose the step of power transmission line observation station, be positioned at this observation station position and ultrasonic range finder is set, and make The ultrasonic emitting head of super ultrasonic range finder points to below ground;
B), measure field process step, be positioned at the ground, ultrasonic emitting head pointing direction place of ultrasonic range finder It is processed into horizontal basal plane;
C), ultrasonic range finder sends ultrasound wave to horizontal basal plane;
D), ultrasonic range finder receives the ultrasound wave gone out by horizontal basal reflection;
E), calculating observation point is apart from vertical dimension H of horizontal basal plane, and judges whether H is in the safety range of setting, If H is not in safety range, and transmit a signal to monitor terminal, monitor terminal alert;If if H is at safe model In enclosing, return step c.
Present method invention there is also following characteristics:
Described power transmission line sag measuring method also including, the ultrasonic emitting head measuring ultrasonic range finder points to perpendicular Nogata to the step of angle theta;
Described observation station is apart from the vertical dimension H=1/2*v*t*cos θ of horizontal basal plane, and wherein, v is that ultrasound wave is at air In spread speed, t be ultrasound wave be sent to receive echo time.
Described power transmission line sag measuring method also includes the step compensating ultrasonic propagation velocity, described compensation Step as follows:
1., temperature and humidity value T and the RH% of observation station position environment are measured, according to saturated vapor pressure table according to saturated Vapour pressure table calculates the saturated vapor pressure P at temperature TS
2. partial pressure P of water vapor in air, is calculatedwStep, Pw=PS* RH%;
3., the step of the ultrasonic velocity v after temperature and humidity compensated is calculated, Wherein P is normal atmosphere (P=1.013*105Pa)、T0=273.15K.
4., calculate measuring point apart from horizontal basal plane vertical away from
For achieving the above object, the another one technical scheme that the present invention uses is: power transmission line based on ultrasonic ranging Sag measures system, including the ultrasonic range finder being arranged on power transmission line, the ultrasonic emitting head of described ultrasonic range finder Downwardly directed, the ground, sensing place being positioned at this emitting head is arranged to horizontal basal plane, and ultrasonic range finder is launched to horizontal basal plane Ultrasound wave, and gather the ultrasound wave that the horizontal basal reflection of reception goes out, and the information of collection is fed back to monitor terminal, monitor terminal Carry out calculating process after reception information, and export warning message.
Native system is invented and be there is also following characteristics:
The side of described ultrasonic range finder is additionally provided with angular transducer, and ultrasonic ranging measured by described angular transducer The ultrasonic emitting head of instrument points to the angle with vertical direction, and measurement signal is fed back to monitor terminal by described angular transducer, Calculating process is carried out after monitor terminal reception information.
System also includes that system institute measured respectively by temperature sensor and humidity sensor, temperature sensor and humidity sensor At humidity and the temperature information of position, and metrical information is fed back to monitor terminal, calculate after monitor terminal reception information Process
Compared with prior art, the technique effect that the present invention possesses is: utilize the ultrasonic range finder being arranged on power transmission line, And make supersonic sensing ultrasonic emitting end be directed vertically to lower section, and ground, underface arranges horizontal basal plane, it is ensured that can To receive ultrasonic echo, improve the reliability of detection, and use ultrasonic range finder and measure transmission pressure arc Hang down, the relative low price of ultrasonic range finder, large-scale use can be accomplished.
Accompanying drawing explanation
Fig. 1 is power transmission line sag measuring method schematic diagram based on ultrasonic ranging;
Fig. 2 is that power transmission line sag based on ultrasonic ranging measures systematic schematic diagram;
Fig. 3 is the logic diagram of power transmission line sag measuring method based on ultrasonic ranging;
Fig. 4 is that ultrasonic velocity is at different temperatures with the change curve of humidity;
Fig. 5 is ultrasonic ranging principle based on PN code and Envelope Correlation;
Fig. 6 is the envelope sending signal with echo-signal.
Detailed description of the invention
In conjunction with Fig. 1 to Fig. 6, the present invention is further described:
It is introduced first against power transmission line sag measuring method based on ultrasonic ranging:
Power transmission line sag measuring method based on ultrasonic ranging, this sag measuring method comprises the steps:
A), choose the step of power transmission line a observation station, be positioned at this observation station position and ultrasonic range finder 10 is set, and The ultrasonic emitting head making ultrasonic range finder 10 points to below ground;
B), measure field process step, be positioned at the ultrasonic emitting head pointing direction location of ultrasonic range finder 10 Face is processed into horizontal basal plane 20;
C), ultrasonic range finder 10 sends ultrasound wave to horizontal basal plane 20;
D), ultrasonic range finder 10 receives the ultrasound wave reflected by horizontal basal plane 20;
E), calculating observation point is apart from vertical dimension H of horizontal basal plane 20, and judges whether H is in the safety range of setting In, if H is not in safety range, and transmit a signal to monitor terminal 60, monitor terminal 60 alert;If such as H In safety range, return step c.
In above-mentioned ultrasonic ranging method, owing to the reason of different terrain may cause ultrasonic range finder 10 place Ground uneven, launching signal and gathering the accuracy of signal and be necessarily affected of such ultrasonic range finder 10, be therefore Guaranteeing accuracy of measurement, the lower section land clearing at ultrasonic range finder 10 goes out a horizontal basal plane 20, such ultrasonic ranging Instrument 10 is when launching ultrasound wave to horizontal basal plane 20, and ultrasonic range finder 10 receives the accuracy of reflection sound wave and is improved, from And guarantee accuracy of measurement, and use ultrasonic range finder and measure transmission pressure sag, the price of ultrasonic range finder Relative moderate, can accomplish large-scale use.
Due to the wind effect of external environment, power transmission line a may be made to be in the attitude waved, be so positioned on power transmission line a Ultrasonic emitting end and the ground of ultrasonic range finder 10 there may be certain angle, the ultrasonic ranging so measured Inaccurate situation will be there is, therefore in described power transmission line sag measuring method in instrument 10 apart from distance H of horizontal basal plane 20 Also include the step of ultrasonic emitting head sensing and the angle theta of vertical direction measuring ultrasonic range finder 10;
Described observation station is apart from the vertical dimension H=1/2*v*t*cos θ of horizontal basal plane 20, and wherein, v is that ultrasound wave is at sky Spread speed in gas, t is the time that ultrasound wave is sent to receive echo.
Shown in Fig. 1, point to the folder with vertical direction by measuring the ultrasonic emitting head of ultrasonic range finder 10 Angle θ, thus conveniently draw the observation station vertical dimension apart from horizontal basal plane according to formula, it is ensured that the accuracy of measurement.
Owing to extraneous weather humidity and temperature are in being continually changing, and this method is carry out observation station real-time Measure so that ultrasound wave spread speed in varying environment is different, therefore extraneous weather humidity and variations in temperature pair Certainty of measurement interference is more serious, for guaranteeing the accuracy of ultrasonic range finder, also wraps in described power transmission line sag measuring method Including the step compensating ultrasonic propagation velocity, the step of described compensation is as follows:
1., temperature and humidity value T and the RH% of observation station position environment are measured, according to saturated vapor pressure table according to saturated Vapour pressure table calculates the saturated vapor pressure P at temperature TS
2. partial pressure P of water vapor in air, is calculatedwStep, Pw=PS* RH%;
3., the step of the ultrasonic velocity v after temperature and humidity compensated is calculated, Wherein P is normal atmosphere (P=1.013*105Pa)、T0=273.15K.
4., calculate measuring point apart from horizontal basal plane 20 vertical away from
It is that indoor are carried out mostly that ultrasound wave in existing carries out the measurement of other field, and humidity and temperature are to ultrasound wave Speed impact can be ignored substantially, and the present invention draws different ultrasonic propagations according to the extraneous temperature implementing to measure, humidity Speed, shown in Fig. 4, at different temperatures, with the change curve of humidity, to this, it is suitable to have summed up for ultrasonic velocity Compensation formula, guarantee ultrasound wave under different temperatures, damp condition to ultrasonic velocity;
At ambient temperature, the test data after temperature and humidity compensation are as follows:
Can be drawn by above table, the test error after compensation is along with the rising of measurement distance, and error tends to permanent substantially Fixed, and the impact of whole measurement can be ignored by this error substantially, thus the ultrasonic range finder essence after overcompensation Degree can be guaranteed.
The algorithm of above-mentioned ultrasonic range finder 10 range finding is that Time Delay Estimation Method based on cross-correlation function is carried out, in conjunction with Shown in Fig. 5, under low signal-to-noise ratio and low sampling rate, carry out ultrasonic ranging, generally use time delay based on cross-correlation function to estimate Method.Its concrete grammar is: the ultrasonic signal sent by emitter is as reference signal, when sending the termination of ultrasound wave every time Carve, immediately begin to the output of receptor is sampled, and calculate the cross-correlation function between sampled value and reference value.If mutually Close function and peak value occur, then explanation sampled value is the echo-signal received, and just can count according to the moment that correlation peak occurs Calculate flight time t.
In order to improve the reliability of ultrasonic ranging algorithm, the pseudo-random binary that suitably can select by means of a process Frenulum pulse signal modulation, as coding signal (PN code), is become ultrasound wave frequency coding signal, in order to encourage transducer, makes by sequence Outwardly send ultrasound wave coding signal.
Shown in Fig. 6, the correction of the time receiving echo about ultrasonic range finder 10 uses convolution algorithm to calculate mutually Correlation function, needs to be modified time to peak, i.e. deducts the duration T of input signal.
It is introduced below for distribution network failure analyzing and positioning system:
Including the ultrasonic range finder 10 being arranged on power transmission line a, the ultrasonic emitting head of described ultrasonic range finder 10 Downwardly directed, the ground, sensing place being positioned at this emitting head is arranged to horizontal basal plane 20, and ultrasonic range finder 10 is to horizontal basal plane 20 launch ultrasound wave, and gather the ultrasound wave that the horizontal basal plane of reception 20 reflects, and the information of collection is fed back to monitor terminal 60, carry out calculating process after monitor terminal 60 reception information, and export warning message.
This ultrasonic range finder 10 can be in the extreme lower position arranging power transmission line a, it is only necessary to calculate the connecing of high-voltage wire pole Line height can draw sag, convenient calculating sag with the measurement height difference of ultrasonic range finder 10.
Shown in Fig. 2, the side of described ultrasonic range finder 10 is additionally provided with angular transducer 30, described angle sensor Device 30 is measured the ultrasonic emitting head of ultrasonic range finder 10 and is pointed to the angle with vertical direction, and described angular transducer 30 will be surveyed Amount signal feeds back to monitor terminal 60, carries out calculating process after monitor terminal 60 reception information.Angular transducer 30 is by measurement The ultrasonic emitting head of ultrasonic range finder 10 points to the angle information with vertical direction and sends to monitor terminal 60, thus according to Trigonometric function computing formula draws the distance of ultrasonic range finder 10 and horizontal basal plane 20.
For improving the precision measured further, system also includes temperature sensor 40 and humidity sensor 50, and temperature passes Humidity and the temperature information of system position measured respectively by sensor 40 and humidity sensor 50, and metrical information feeds back to prison Control terminal 60, carries out calculating process after monitor terminal 60 reception information.Temperature sensor 40 and humidity sensor 50 are by measurement Temperature and humidity information feed back to monitor terminal 60, and monitor terminal 60 calculates according to feedack, and to ultrasound The ultrasound wave of distance meter 10 compensates such that it is able to improve the precision measured of adjusting the distance.

Claims (6)

1. power transmission line sag measuring method based on ultrasonic ranging, it is characterised in that: this sag measuring method includes walking as follows Rapid:
A), choose the step of power transmission line (a) observation station, be positioned at this observation station position and ultrasonic range finder (10) is set, and The ultrasonic emitting head making ultrasonic range finder (10) points to below ground;
B), measure field process step, be positioned at the ground, ultrasonic emitting head pointing direction place of ultrasonic range finder (10) It is processed into horizontal basal plane (20);
C), ultrasonic range finder (10) sends ultrasound wave to horizontal basal plane (20);
D), ultrasonic range finder (10) receives the ultrasound wave being reflected back by horizontal basal plane (20);
E), calculating observation point vertical dimension H apart from horizontal basal plane (20), and judge whether H is in the safety range of setting, If H is not in safety range, and transmit a signal to monitor terminal (60), monitor terminal (60) alert;If such as H In safety range, return step c.
Power transmission line sag measuring method based on ultrasonic ranging the most according to claim 1, it is characterised in that: described defeated Electric wire sag measuring method also including, the ultrasonic emitting head measuring ultrasonic range finder (10) points to and vertical direction The step of angle theta;
Described observation station is apart from the vertical dimension H=1/2*v*t*cos θ of horizontal basal plane (20), and wherein, v is that ultrasound wave is at air In spread speed, t be ultrasound wave be sent to receive echo time.
Power transmission line sag measuring method based on ultrasonic ranging the most according to claim 2, it is characterised in that: described defeated Also including the step compensating ultrasonic propagation velocity in electric wire sag measuring method, the step of described compensation is as follows:
1., temperature and humidity value T and the RH% of observation station position environment are measured, according to saturated vapor pressure table according to saturated vapor Pressure table calculates the saturated vapor pressure P at temperature TS
2. partial pressure P of water vapor in air, is calculatedwStep, Pw=PS* RH%;
3., the step of the ultrasonic velocity v after temperature and humidity compensated is calculated,Wherein P is normal atmosphere (P=1.013*105Pa)、T0=273.15K;
4., calculate measuring point apart from horizontal basal plane (20) vertical away from
4. power transmission line sag based on ultrasonic ranging measures system, it is characterised in that: include that be arranged on power transmission line (a) surpasses Sound-ranging equipment (10), the ultrasonic emitting of described ultrasonic range finder (10) is downwardly directed, is positioned at the sensing of this emitting head Ground, place is arranged to horizontal basal plane (20), and ultrasonic range finder (10) launches ultrasound wave to horizontal basal plane (20), and collection connects Receiving the ultrasound wave that horizontal basal plane (20) reflects, and the information of collection feeds back to monitor terminal (60), monitor terminal (60) connects Collect mail and carry out calculating process after ceasing, and export warning message.
Power transmission line sag based on ultrasonic ranging the most according to claim 4 measures system, it is characterised in that: described super The side of sound-ranging equipment (10) is additionally provided with angular transducer (30), and ultrasonic range finder measured by described angular transducer (30) (10) ultrasonic emitting head points to the angle with vertical direction, and measurement signal is fed back to monitoring by described angular transducer (30) Terminal (60), carries out calculating process after monitor terminal (60) reception information.
Power transmission line sag based on ultrasonic ranging the most according to claim 5 measures system, it is characterised in that: system is also System is measured respectively including temperature sensor (40) and humidity sensor (50), temperature sensor (40) and humidity sensor (50) The humidity of position and temperature information, and metrical information is fed back to monitor terminal (60), monitor terminal (60) receives information After carry out calculating process.
CN201610272144.1A 2016-04-27 2016-04-27 Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof CN105974423A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610272144.1A CN105974423A (en) 2016-04-27 2016-04-27 Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610272144.1A CN105974423A (en) 2016-04-27 2016-04-27 Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof

Publications (1)

Publication Number Publication Date
CN105974423A true CN105974423A (en) 2016-09-28

Family

ID=56994136

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610272144.1A CN105974423A (en) 2016-04-27 2016-04-27 Power transmission line sag measurement method based on ultrasonic distance measuring and system thereof

Country Status (1)

Country Link
CN (1) CN105974423A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643624A (en) * 2017-01-10 2017-05-10 国网江苏省电力公司电力科学研究院 Device and method of measuring minimum distance between lead and support during insulator wind deflection
CN107568906A (en) * 2017-11-02 2018-01-12 山东建筑大学 A kind of concealed intelligent elevated dais of microphone
CN108508444A (en) * 2017-02-27 2018-09-07 国网山西省电力公司阳泉供电公司 A kind of mining influence area power transmission line sag computational methods and system
CN109584630A (en) * 2018-12-13 2019-04-05 辽宁工业大学 A kind of vehicle lane change prior-warning device and method for early warning based on car networking

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101915889A (en) * 2010-08-10 2010-12-15 吕强 Conductor sag on-line monitoring system
CN102221381A (en) * 2011-06-10 2011-10-19 国网信息通信有限公司 Method and system for monitoring power transmission line of power grid
CN202041178U (en) * 2010-12-30 2011-11-16 中国电力科学研究院 On-line monitoring system for power transmission line sag
CN103323167A (en) * 2013-07-10 2013-09-25 国家电网公司 Method for monitoring stress and sag of transmission line conductor
CN104457590A (en) * 2014-12-30 2015-03-25 上海电缆研究所 Conductor sag monitoring device based on laser distance measurement and monitoring methods
CN204495306U (en) * 2015-04-15 2015-07-22 三峡大学 Based on the power transmission line sag measuring system of infrasonic wave principle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101915889A (en) * 2010-08-10 2010-12-15 吕强 Conductor sag on-line monitoring system
CN202041178U (en) * 2010-12-30 2011-11-16 中国电力科学研究院 On-line monitoring system for power transmission line sag
CN102221381A (en) * 2011-06-10 2011-10-19 国网信息通信有限公司 Method and system for monitoring power transmission line of power grid
CN103323167A (en) * 2013-07-10 2013-09-25 国家电网公司 Method for monitoring stress and sag of transmission line conductor
CN104457590A (en) * 2014-12-30 2015-03-25 上海电缆研究所 Conductor sag monitoring device based on laser distance measurement and monitoring methods
CN204495306U (en) * 2015-04-15 2015-07-22 三峡大学 Based on the power transmission line sag measuring system of infrasonic wave principle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106643624A (en) * 2017-01-10 2017-05-10 国网江苏省电力公司电力科学研究院 Device and method of measuring minimum distance between lead and support during insulator wind deflection
CN108508444A (en) * 2017-02-27 2018-09-07 国网山西省电力公司阳泉供电公司 A kind of mining influence area power transmission line sag computational methods and system
CN107568906A (en) * 2017-11-02 2018-01-12 山东建筑大学 A kind of concealed intelligent elevated dais of microphone
CN109584630A (en) * 2018-12-13 2019-04-05 辽宁工业大学 A kind of vehicle lane change prior-warning device and method for early warning based on car networking
CN109584630B (en) * 2018-12-13 2020-12-22 辽宁工业大学 Vehicle lane change early warning method based on Internet of vehicles

Similar Documents

Publication Publication Date Title
AU656504B2 (en) Methods and apparatus for determining the trajectory of a supersonic projectile
Smith et al. Wind lidar evaluation at the Danish wind test site in Høvsøre
CN103105140B (en) Building deformation monitoring device and the method with its monitoring
Rakov Electromagnetic methods of lightning detection
JP2011128149A (en) Method and system for detection of hazard to aviation due to convective weather
CN102175887B (en) Mobile ultrasonic anemoclinograph and method for measuring wind speed and direction
CN107782976B (en) It is a kind of meter and soil ion concentration impulse earthed resistance measurement method
Smith et al. Sea surface wind stress and drag coefficients: The HEXOS results
US6420862B2 (en) System and method of locating lightning strikes
CN103336259B (en) The detecting system of local discharge of gas-insulator switchgear detection sensor and method
Harris et al. Advance measurement of gusts by laser anemometry
CN104166126B (en) A kind of simulated radar echo method for continuous wave radar
CN102540145B (en) Single-station quasi-three-dimensional lightning positioning device and method
EP0792461B1 (en) A method and a device for determining wind velocity or velocity of a fluid and use thereof
CN102435980A (en) Analytical solution-based acoustic emission source or micro seismic source positioning method
EP2233947A3 (en) Increasing measurement rate in time of flight measurement apparatuses
JP2007018291A (en) Tsunami information provision method and tsunami information provision system
US20080148839A1 (en) Acoustic profiler for wind, temperature, and turbulence
CN103383428B (en) A kind of pole line cable hybrid line both-end Method of Traveling Wave Fault Ranging
CN105610087B (en) Power grid transmission line inspection tour system
CN104568323A (en) SF6 gas leakage on-line monitoring and alarming system
CN105388465B (en) Sea clutter simulation method based on wave spectrum model
US8718971B2 (en) System for determining the airspeed of an aircraft
Wildmann et al. Wind turbine wake measurements with automatically adjusting scanning trajectories in a multi-Doppler lidar setup
US10317573B2 (en) Locating a lightning strike at a wind turbine

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20160928