CN109298201A - Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed - Google Patents
Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed Download PDFInfo
- Publication number
- CN109298201A CN109298201A CN201811233100.3A CN201811233100A CN109298201A CN 109298201 A CN109298201 A CN 109298201A CN 201811233100 A CN201811233100 A CN 201811233100A CN 109298201 A CN109298201 A CN 109298201A
- Authority
- CN
- China
- Prior art keywords
- electromotive force
- hall
- induced electromotive
- speed
- size
- 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.)
- Pending
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005355 Hall effect Effects 0.000 title claims abstract description 17
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 17
- 239000004020 conductor Substances 0.000 claims abstract description 25
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000011017 operating method Methods 0.000 claims abstract description 4
- 229910001120 nichrome Inorganic materials 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000009510 drug design Methods 0.000 abstract 1
- 230000006870 function Effects 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 description 1
- 101150102866 adc1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The present invention relates to a kind of methods using Hall effect and electromagnetic induction rule measurement walking speed, the implementation steps of this method include: 1, setting measuring device: the structure of the measuring device is set as three parts: first part is made of compass and gaussmeter, i.e. hall device circuit system；Second part is made of the conductor of cutting magnetic line and the circuit system of measurement induced electromotive force；Part III is STM32 control module, and STM32 control module receives and provides the size of the speed of travel by the calculation formula embedded after above data, and is output on LED display and shows.2, with experimental principle operating procedure: design principle of the present invention is mainly to utilize the rule of Hall effect and electromagnetic induction phenomenon, i.e., measures walking speed using induced electromotive force or induced current.That the present invention has rational design is novel, performance safety is reliable, easy to operate, application effect highly significant；With certain economic benefit and great social benefit, and there is important and wide application prospect.
Description
Technical field
The present invention relates to a kind of walking meter speed methods, in particular to a kind of to be measured using Hall effect and electromagnetic induction rule
The method of walking speed.
Background technique
The measurement of walking speed has very important meaning in production and life；Such as: in certain economic theories
In, speed of travel index is the level of economic development or index of economic development that city can be described from a side, but at present
Measurement all only measurements to average speed to speed of travel index；People take exercises running or on foot when, or even
Car and boat often have a mind to think to understand at any time the travel speed for knowing oneself in advancing, but the health and fitness facilities or instrument that are commercialized can only
Step number, distance and time are provided, this can only obtain average speed；What is reflected is corresponding a certain distance or putting down in the period
Equal speed, it has not been convenient to the speed of reaction immediately at once.
It is thus highly desirable to provide a kind of method for inducing movement velocity immediately, that is, designs one kind and induce immediately
The portable instrument or instrument of movement velocity.All it is rotating shaft transmission formula instrument used in automobile at present, is used in aircraft
Using pressure, the instrument of temperature sensing, these instrument are difficult to repack walking speed of travel instrument into, therefore to the walking speed of travel
The design of instrument is inconvenient to use the working principle of the above two classes instrument.As far as we know, it yet there are no in relation to utilizing Hall
The patent and document report of effect and electromagnetic induction rule measurement walking speed.
Therefore it provides a kind of design novel, the utilization Hall effect of application effect highly significant reasonable, easy to operate and electricity
The method that magnetic induction rule measures walking speed, is one of the problem of field technical staff currently urgently addresses.
Summary of the invention
It is an object of the present invention to overcome the above deficiencies, provide a kind of design rationally, performance safety is reliable, operation letter
Just, the method using Hall effect and electromagnetic induction rule measurement walking speed of application effect highly significant.
To achieve the above object the technical scheme adopted by the invention is that: it is a kind of using Hall effect and electromagnetic induction rule
The method for measuring walking speed, it is characterised in that the method specific implementation step of the measurement walking speed includes:
1, measuring device is set:
The structure of the measuring device is set as three parts:
First part is made of compass and gaussmeter, i.e. hall device circuit system；Second part is led by cutting magnetic line
The circuit system composition of body and measurement induced electromotive force；Part III is STM32 control module；
The first part is for the magnetic induction intensity of the angle and earth's magnetic field of measuring direction of travel and earth's magnetic field, and number
According to inputing to STM32 control module；It is breakpoint at direction of advance wherein using not closed circle nichrome resistance wire track,
Closed circle nichrome resistance wire track both ends do not add 1.5 volts of voltages, with milivoltmeter measurement measure at advance mark with compass position
Voltage swing between settingu 1, data input to STM32 control module；Another hall device is connected perpendicular to compass, guarantees Hall
Device is always perpendicular to earth's magnetic field；The electric current passed through in hall device provides measurement by 3 volts of power supply of hall device circuit system
Electric current, the electric current and electromotive force generated on hall device is measured by milliammeter and microvoltmeter, to provide electric currentIWith electromotive forceu
Data are simultaneously inputed to STM32 control module by size；
Perpendicular to direction of advance fixed conductor in the second part, the conductor cuts the magnetic line of force in earth's magnetic field when walking,
Dynamic raw induced electromotive force is generated, induced electromotive force is provided by the milliammeter or microvoltmeter of dynamic raw induced electromotive force circuit systemU
Size, and data are inputed to STM32 control module；
The speed of travel is provided by embedded calculation formula after the STM32 control module reception above data of the Part III
Size, and be output on LED display and show；
2, with experimental principle operating procedure:
Design principle of the present invention is mainly to utilize the rule of Hall effect and electromagnetic induction phenomenon, that is, utilizes induced electromotive force or sense
Electric current is answered to carry out measuring speed；Specifically:
(1) indicate the north to and providing direction of advance, direction of advance is marked in panel surface, and when walking makes by compass
Indicate that direction is consistent with direction of travel, angle between the magnetic line of force direction in earth's magnetic field (i.e. northern to) (θ)；
(2) by hall device circuit system provide earth's magnetic field size (B)；
(3) by dynamic raw induced electromotive force circuit system provide induced electromotive force size (U)；
(4) according to the conductor size of motional electromotive force and cutting magnetic line (L) calculate movement speed (V)；
Measure compass and direction of advance angle formulae are as follows:
θ=240u 1Formula 1；
u 1For the voltage at advance mark between guide pin position；
The theoretical formula of measuring principle foundation are as follows: when hall device is vertical with magnetic field,
B=ud/IFormula 2；
dFor Hall board size (thickness),
uFor the size of hall electromotive force,
IFor the current strength in hall device；
When cutting magnetic line conductor (generating induced electromotive force thereon) direction and magnetic direction at angle (θ) movement when have:
V=U/(BLSinθ) formula 3；
VThe as speed of travel,
LFor conductor length,
UFor induced electromotive force.
The beneficial effects of the present invention are:
(1) the walking speed measuring device being arranged in the present invention is using induced electromotive force or induced current come measuring speed；
(2) it can measure and obtain instantaneous velocity；
(3) measuring device can separately fabricated be a body-building speed of travel indicator, can also with other step numbers, distance,
The indicators such as time fit together, to provide more walking information；The measuring device, which may alternatively be integrated within, facilitates people in mobile phone
Use.
In short, the present invention measures walking speed using Hall effect and the rule of electromagnetic induction phenomenon, design is reasonable
It is novel, performance safety is reliable, easy to operate, application effect highly significant；With huge economic benefit and great society's effect
Benefit, and there is important and wide application prospect.
Detailed description of the invention
Fig. 1 is that measuring device of the present invention constitutes block diagram；
Compass and direction of advance angle instrumentation plan in Fig. 2 present invention；
In figure: 1 direction of advance, 2 compasses, 3 1.5 volts of batteries, 4 not closed circle nichrome resistance wire tracks, 5 copper conductors, 6 connect
Terminal.
Specific embodiment
Below in conjunction with attached drawing and preferred embodiment, to specific embodiment, the feature provided according to the present invention, details are as follows:
As shown in Figure 1 and Figure 2, a method of measuring walking speed, the measurement walking using Hall effect and electromagnetic induction rule
The method specific implementation step of speed includes:
1, measuring device is set:
The structure of the measuring device is set as three parts:
First part is made of compass and gaussmeter, i.e. hall device circuit system；Second part is led by cutting magnetic line
The circuit system composition of body and measurement induced electromotive force；Part III is STM32 control module (commercially available).
The first part be for the magnetic induction intensity of the angle and earth's magnetic field of measuring direction of travel and earth's magnetic field, and
Data are inputed to STM32 control module；Wherein using not closed circle nichrome resistance wire track 4, as shown in Fig. 2, advancing
It is breakpoint at direction 1, connects 1.5 volts of batteries 3 with copper conductor 5 at not 4 both ends of closed circle nichrome resistance wire track, use milivoltmeter
Measure the voltage swing at direction of advance 1 between 2 position binding post 6 of compassu 1, data input to STM32 control mould
Block；Another hall device is connected perpendicular to compass 2, guarantees hall device always perpendicular to earth's magnetic field；Pass through in hall device
Electric current provides measurement electric current by 3 volts of power supply of hall device circuit system, and the electric current and electromotive force generated on hall device is by milli
Pacify table and microvoltmeter measures, to provide electric currentIWith electromotive forceuData are simultaneously inputed to STM32 control module by size.
Perpendicular to direction of advance fixed conductor in the second part, the conductor cuts the magnetic force in earth's magnetic field when walking
Line generates dynamic raw induced electromotive force, provides induction electric by the milliammeter or microvoltmeter of dynamic raw induced electromotive force circuit system
GestureUSize, and data are inputed to STM32 control module.
The speed of travel is provided by embedded calculation formula after the Part III STM32 control module reception above data
Size, and be output on external device (ED) LED display and show.
To physical quantity, is configured in STM32 control module, determine input terminal；Founding mathematical models utilize C language pair
Model is programmed in Notepad；Principal function is established, data are acquired, formula function is called in principal function；To formulaθ=
240u 1,B=ud/IAndV=U/(BLSinθ) be programmed (formula R is the resistance value for measuring electric current,dWithLIt is constant,IRepresentative measures
Electric current,VIt is final output), electric current is converted into voltage in formula, and the voltage value of ADC1 conversion passes to SRAM by MDA mode,
Save collected variate-value；It is updated in function using collected 4 voltage values as variable, formula is called to realize function,
It completes to calculate in formula function, result is exported according to formula.
The measuring device can separately fabricated be a body-building speed of travel indicator, or with other step numbers, distance, time
Equal indicators fit together, to provide more walking information；The device can also be integrated in convenient for people to use in mobile phone.
2, with experimental principle operating procedure: design principle of the present invention mainly utilizes Hall effect and electromagnetic induction phenomenon
Rule, i.e., using induced electromotive force or induced current come measuring speed；Specifically:
(1) indicate the north to and providing direction of advance (direction of advance is marked in panel surface, and when walking makes by compass
It is consistent with direction of travel to indicate direction) and the magnetic line of force direction (i.e. northern to) in earth's magnetic field between angle (θ)；
(2) by hall device circuit system provide earth's magnetic field size (B)；
(3) by dynamic raw induced electromotive force circuit system provide induced electromotive force size (U)；
(4) according to the conductor size of motional electromotive force and cutting magnetic line (L) calculate movement speed (V)；The defect of the design
It is that cannot provide the speed mobile along earth magnetism field direction (close to positive North and South direction)；
Measure compass and direction of advance angle formulae are as follows:
θ=240u 1Formula 1；
The theoretical formula of measuring principle foundation are as follows: have when hall device is vertical with magnetic field
B=ud/IFormula 2；
dFor Hall board size (thickness),
uFor the size of hall electromotive force,
IFor the current strength in hall device；
When conductor (the generating induced electromotive force thereon) direction of cutting magnetic line and magnetic direction are at angleθHave when movement:
V=U/(BLSinθ) formula 3；
VThe as speed of travel,
LFor conductor length,
UFor induced electromotive force.
Design principle of the invention is: measuring walking using Hall effect and electromagnetic induction rule the present invention provides a kind of
The method of speed, the i.e. present invention mainly measure walking speed using induced electromotive force or induced current.
Specifically:
(1) indicate the north to and providing direction of advance (direction of advance is marked in panel surface, and when walking makes by compass
It is consistent with direction of travel to indicate direction) and the magnetic line of force direction (i.e. northern to) in earth's magnetic field between angle (θ), this angle is just
It is the angle in the direction and direction of advance by compass；
Measure compass and direction of advance angle formulae are as follows:
θ=240u 1Formula 1；
(2) hall device is connected perpendicular to compass, provides earth magnetism by the milliammeter or milivoltmeter of hall device circuit system
Size (B)；The theoretical formula of measuring principle foundation are as follows: have when hall device is vertical with magnetic field:
B=ud/IFormula 2；
In formula:dFor Hall board size (thickness),uFor the size of hall electromotive force,IFor the current strength in hall device.
(3) perpendicular to direction of advance fixed conductor, the magnetic line of force in conductor cutting earth's magnetic field, generates dynamic life when walking
Induced electromotive force, by the milliammeter or microvoltmeter of dynamic raw induced electromotive force circuit system provide induced electromotive force size (U).
(4) according to the conductor size of motional electromotive force and cutting magnetic line (L) calculate movement speed (V)；The design
Defect is cannot to provide the speed mobile along earth magnetism field direction (close to positive North and South direction)；
Specifically: when cutting magnetic line conductor (generating induced electromotive force thereon) direction and magnetic direction at angle (θ) movement
Shi You:
V=U/(BLSinθ) formula 3；
In formula:VThe as speed of travel,LFor conductor length,UFor induced electromotive force.
Specific application example: people walks along direction northwest, when measuring at advance mark between guide pin position binding post
Voltageu 1It is 3/16 volt, then has direction of advance and positive northern (earth magnetism field direction) at angleθIt is 45 °；When Hall plate thicknessdIt is
0.005 meter, the current strength in hall deviceIPacify for 0.02, the hall electromotive force generated in hall deviceuIt is 0.00016 volt,
Then earth's magnetic fieldBIt is 0.00004 spy；The dynamic raw induced electromotive force that the conductor of cutting magnetic line generates when if people walksUFor
0.0004 volt, conductor lengthLIt is 0.02 meter, then finally can be calculatedV0.7 meter per second, i.e., people walking speed be 0.7 meter/
Second.
Above-mentioned reference embodiment carries out the method using Hall effect and electromagnetic induction rule measurement walking speed
Detailed description, is illustrative without being restrictive, therefore the change and modification in the case where not departing from present general inventive concept, answers
Belong within protection scope of the present invention.
Claims (2)
1. a kind of method using Hall effect and electromagnetic induction rule measurement walking speed, it is characterised in that the measurement walking speed
The method specific implementation step of degree includes:
1, measuring device is set:
The structure of the measuring device is set as three parts:
First part is made of compass and gaussmeter, i.e. hall device circuit system；Second part is led by cutting magnetic line
The circuit system composition of body and measurement induced electromotive force；Part III is STM32 control module；
The first part is for the magnetic induction intensity of the angle and earth's magnetic field of measuring direction of travel and earth's magnetic field, and number
According to inputing to STM32 control module；It is breakpoint at direction of advance wherein using not closed circle nichrome resistance wire track,
Closed circle nichrome resistance wire track both ends do not add 1.5 volts of voltages, with milivoltmeter measurement measure at direction of advance with compass position
Voltage swing between settingu 1, data input to STM32 control module；Another hall device is connected perpendicular to compass, guarantees Hall
Device is always perpendicular to earth's magnetic field；The electric current passed through in hall device provides measurement by 3 volts of power supply of hall device circuit system
Electric current, the electric current and electromotive force generated on hall device is measured by milliammeter and microvoltmeter, to provide electric currentIWith electromotive forceu
Data are simultaneously inputed to STM32 control module by size；
Perpendicular to direction of advance fixed conductor in the second part, the conductor cuts the magnetic line of force in earth's magnetic field when walking,
Dynamic raw induced electromotive force is generated, induced electromotive force is provided by the milliammeter or microvoltmeter of dynamic raw induced electromotive force circuit systemU
Size, and data are inputed to STM32 control module；
The speed of travel is provided by embedded calculation formula after the STM32 control module reception above data of the Part III
Size, and be output on LED display and show；
2, with experimental principle operating procedure:
Design principle of the present invention is mainly to utilize the rule of Hall effect and electromagnetic induction phenomenon, that is, utilizes induced electromotive force or sense
Electric current is answered to carry out measuring speed；Specifically:
(1) indicate the north to and providing direction of advance, direction of advance is marked in panel surface, and when walking makes by compass
Indicate that direction is consistent with direction of travel, angle between the magnetic line of force direction in earth's magnetic field (i.e. northern to) (θ)；
(2) by hall device circuit system provide earth's magnetic field size (B)；
(3) by dynamic raw induced electromotive force circuit system provide induced electromotive force size (U)；
(4) according to the conductor size of motional electromotive force and cutting magnetic line (L) calculate movement speed (V)；
Measure compass and direction of advance angle formulae are as follows:
θ=240u 1Formula 1；
u 1For the voltage at advance mark between guide pin position；
The theoretical formula of measuring principle foundation are as follows: when hall device is vertical with magnetic field,
B=ud/IFormula 2；
dFor Hall board size (thickness),
uFor the size of hall electromotive force,
IFor the current strength in hall device；
When cutting magnetic line conductor (generating induced electromotive force thereon) direction and magnetic direction at angle (θ) movement when have:
V=U/(BLSinθ) formula 3；
VThe as speed of travel,
LFor conductor length,
UFor induced electromotive force.
2. the method according to claim 1 using Hall effect and electromagnetic induction rule measurement walking speed, feature
Be that the measuring device be separately fabricated is a body-building speed of travel indicator, or with include step number, distance, the finger of time
Show that device fits together, or is integrated in mobile phone and is convenient for people to use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233100.3A CN109298201A (en) | 2018-10-23 | 2018-10-23 | Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811233100.3A CN109298201A (en) | 2018-10-23 | 2018-10-23 | Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109298201A true CN109298201A (en) | 2019-02-01 |
Family
ID=65158318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811233100.3A Pending CN109298201A (en) | 2018-10-23 | 2018-10-23 | Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109298201A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834949A (en) * | 2020-06-08 | 2021-12-24 | 北京小米移动软件有限公司 | Speed measuring method, device and equipment for wireless charging electric automobile and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006145240A (en) * | 2004-11-16 | 2006-06-08 | Univ Nihon | Method and apparatus for measuring human walking speed |
| CN1818559A (en) * | 2005-02-11 | 2006-08-16 | 三星电子株式会社 | Stride-based route guiding apparatus and method |
| CN103153185A (en) * | 2010-08-26 | 2013-06-12 | 荷兰应用自然科学研究组织Tno | Method and system for determining the walking or running speed of a person |
| CN107636420A (en) * | 2015-06-26 | 2018-01-26 | 英特尔公司 | Technology for pedestrian's dead reckoning |
| CN107748272A (en) * | 2017-11-27 | 2018-03-02 | 浙江星天海洋科学技术有限公司 | Irregular component speed measuring device in closed barrel based on Hall effect |
-
2018
- 2018-10-23 CN CN201811233100.3A patent/CN109298201A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006145240A (en) * | 2004-11-16 | 2006-06-08 | Univ Nihon | Method and apparatus for measuring human walking speed |
| CN1818559A (en) * | 2005-02-11 | 2006-08-16 | 三星电子株式会社 | Stride-based route guiding apparatus and method |
| CN103153185A (en) * | 2010-08-26 | 2013-06-12 | 荷兰应用自然科学研究组织Tno | Method and system for determining the walking or running speed of a person |
| CN107636420A (en) * | 2015-06-26 | 2018-01-26 | 英特尔公司 | Technology for pedestrian's dead reckoning |
| CN107748272A (en) * | 2017-11-27 | 2018-03-02 | 浙江星天海洋科学技术有限公司 | Irregular component speed measuring device in closed barrel based on Hall effect |
Non-Patent Citations (1)
| Title |
|---|
| 周小虎;余斌;陶清华;: "基于霍尔效应的新型多功能数字高斯计设计", 硅谷, no. 02, 23 January 2013 (2013-01-23), pages 11 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834949A (en) * | 2020-06-08 | 2021-12-24 | 北京小米移动软件有限公司 | Speed measuring method, device and equipment for wireless charging electric automobile and storage medium |
| CN113834949B (en) * | 2020-06-08 | 2024-04-30 | 北京小米移动软件有限公司 | Speed measuring method, device and equipment for wireless charging electric automobile and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109298201A (en) | Utilize the method for Hall effect and electromagnetic induction rule measurement walking speed | |
| CN103394178A (en) | Digital inertia dumbbell capable of measuring motion parameters | |
| CN208984659U (en) | Utilize the device of Hall effect and electromagnetic induction rule measurement walking speed | |
| CN201229352Y (en) | Novel air measurement instrument | |
| CN202814839U (en) | Electromagnetic liquid viscosity coefficient testing instrument | |
| CN203259595U (en) | Full-automatic digital megohmmeter | |
| CN201341875Y (en) | Electronic blood pressure meter capable of indicating correct measuring position | |
| CN202126785U (en) | Tester for Faraday's electromagnetic induction law | |
| CN203012007U (en) | Novel voltmeter | |
| CN201706991U (en) | Measuring scale | |
| CN107990941A (en) | A kind of multifunctional water well measurements device | |
| CN207890845U (en) | A kind of elevator governor tester | |
| CN203053991U (en) | Tachymeter | |
| CN202101612U (en) | Teaching ruler for measuring curve | |
| CN208294511U (en) | A kind of low side measuring device for directional survey | |
| CN103256886B (en) | A kind of plane cord angular displacement sensor | |
| CN207798139U (en) | A kind of multifunctional water well measurements device | |
| CN202223215U (en) | Running measurer | |
| CN2638074Y (en) | Intelligent three-dimensional magnetic field detector | |
| CN201716354U (en) | Universal meter | |
| CN205826563U (en) | Dry rubber content analyzer | |
| CN203012006U (en) | Novel ammeter | |
| CN205228586U (en) | A device for electricity survey ground water level | |
| CN206862280U (en) | A kind of geologic body psephicity measurement apparatus | |
| CN205925729U (en) | Digital display ion exchange column of measurable velocity of flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |