WO2001073449A1 - Accelerometre triaxial utilisant un fluide magnetique - Google Patents

Accelerometre triaxial utilisant un fluide magnetique Download PDF

Info

Publication number
WO2001073449A1
WO2001073449A1 PCT/JP2000/006848 JP0006848W WO0173449A1 WO 2001073449 A1 WO2001073449 A1 WO 2001073449A1 JP 0006848 W JP0006848 W JP 0006848W WO 0173449 A1 WO0173449 A1 WO 0173449A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
spherical
magnetic fluid
axis
acceleration
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.)
Ceased
Application number
PCT/JP2000/006848
Other languages
English (en)
Japanese (ja)
Inventor
Shozo Hirayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority claimed from JP2000087310A external-priority patent/JP3311329B2/ja
Application filed by Individual filed Critical Individual
Priority to AU74526/00A priority Critical patent/AU7452600A/en
Publication of WO2001073449A1 publication Critical patent/WO2001073449A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/105—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by magnetically sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions

Definitions

  • the present invention relates to an accelerometer, in particular, for use in measuring the vibration of a structure, for use in an inertial guidance device or a travel recording device of a traffic engine, and for inputting a three-dimensional motion in a computer graphic.
  • the present invention relates to a three-axis accelerometer that can be used for a 3D mouse, a sensor for measuring a three-dimensional motion such as a robot, and the like. Background art
  • Many conventional accelerometers are based on a structure called a sizemo system in which the inertial weight is supported by a spring system.
  • the weight is supported by a support having elasticity such as a spring, and the amount of change in the position of the weight caused by acceleration and the amount of change in the support such as a panel caused by the acceleration are measured.
  • the acceleration is calculated from the quantity.
  • acceleration measurement methods include, for example, a method using a piezo effect (semiconductor type) that captures, as a change in voltage, a distortion of a support body caused by displacement of a weight portion, and a method of measuring a weight portion with a capacitor.
  • the mainstream is the one that uses the change in capacitance according to the displacement of the weight as one of the poles (capacitance type).
  • the mass is concentrated on the weight part, the support is processed into a panel or panel shape to give elasticity, and the weight and the support easily displace according to the acceleration received by the weight. It has become.
  • An object of the present invention is to solve the above-mentioned two problems in the related art, so that one accelerometer can measure evenly in all three axes with one accelerometer without employing a structure of a seismic system. It is an object of the present invention to provide an accelerometer capable of performing a wide range of measurements.
  • a three-axis accelerometer using a magnetic fluid includes a spherical weight, a spherical storage container for storing the spherical weight, and a magnetic fluid sealed between the weight and the spherical storage container. And a plurality of magnets arranged on the surface of the spherical weight (or the inner surface of the spherical storage container), wherein each of the plurality of magnets is the spherical shape for applying a magnetic force to the magnetic fluid.
  • a cavity for adjusting the specific gravity of the weight is provided at the center of the spherical weight.
  • the fluid pressure gauge is provided with a pressure detection tube that penetrates the wall of the spherical storage container and reaches the magnetic fluid.
  • the fluid pressure gauge includes the spherical weight. Are provided on the X-axis, Y-axis, and Z-axis with the center of the coordinate axis as the origin of the coordinate axes.
  • FIG. 1 is a configuration diagram of a main part of a three-axis accelerometer as one embodiment according to the present invention.
  • FIG. 2 is a partially cutaway view of the three-axis accelerometer of FIG.
  • FIGS. 3A and 3B are detailed diagrams showing the relationship between the weight, the magnet, and the magnetic fluid.
  • the following basic structure is employed without using a structure of a sizing system.
  • a large number of magnets are arranged on either the surface of the spherical weight or the inner surface (inner wall) of the containment so that adjacent magnets have opposite polarities, and the gap between the weight and the containment is placed in the gap. A substantially uniform magnetic field is generated.
  • the weight By enclosing the weight and the magnetic fluid in the containment vessel, the weight is supported in a non-contact manner by the magnetic fluid in the containment vessel.
  • FIG. 1 is a main part configuration diagram of a three-axis accelerometer as one embodiment according to the present invention
  • FIG. 2 is a partially cutaway overall view of the three-axis accelerometer of FIG. 3B is a detailed view showing the relationship between the weight, the magnet, and the magnetic fluid. is there.
  • 1 is the weight
  • la is the cavity at the center of the weight
  • lb is the magnet
  • 2 is the magnetic fluid
  • 3 is the containment vessel
  • 3a is the coupling flange
  • 3b is the magnetic fluid inlet
  • 4 is the magnetic fluid inlet.
  • a fluid pressure sensor 4a is a diaphragm in the pressure sensor
  • 4b is a lead of the pressure sensor
  • 4c is a pressure detecting tube of the pressure sensor
  • 5 is a CPU
  • 6 is a housing case
  • 7 is a line of magnetic force.
  • the weight 1 is a nonmagnetic metal, and a number of holes are engraved substantially evenly on the surface, and a magnet 1b is embedded in each hole so that the N pole and the S pole face each other alternately. For this reason, the surface of the weight 1 is almost uniformly covered with the magnetic field lines 7 as shown in FIG. 3A.
  • each magnet lb has a magnetic force enough to cover the gap between the weight 1 and the storage container 3 with the magnetic force lines 7.
  • a cavity 1a is opened in the center of the weight 1. This is to adjust the specific gravity of the weight 1 in accordance with the apparent specific gravity of the magnetic fluid 2 in the magnetic field, whereby the weight 1 floats almost in the center of the storage container 3. Can be.
  • Containment container 3 for storing weight 1 is formed of a spherical shape with resin.
  • the storage container 3 has a structure capable of being divided into two parts. After the weight 1 is stored, the storage container 3 is bonded with an adhesive at a connection flange 3a. Since the inside of the containment vessel 3 has a slightly larger spherical shape than the weight 1, the magnetic flow is larger than that of the inlet 3b. When the body 2 is injected, the magnetic fluid 1 flows uniformly into the gap between the weight 1 and the containment vessel 3. As a result, the weight 1 floats at the center of the containment vessel 3 and is supported by the containment vessel 3 without contact.
  • Containment Vessel 3 has a pair of fluid pressure sensors for each axis at the intersection of the X, X, and Z axes with the origin at the center of the vessel and the inner wall of Containment Vessel 3. That is, a total of three (six) fluid pressure sensors 4 are mounted. Magnetic fluid 2 is introduced into the sensor from the pressure detection tube 4c of each fluid pressure sensor.
  • the fluid pressure sensor 4 is a diaphragm-type digital pressure sensor.
  • the pressure of the magnetic fluid 2 from the pressure detection tube 4c is detected by the diaphragm 4a in the pressure sensor, and the pressure change is converted into a digital signal. Communicate to 5.
  • FIG. 2 illustrates the positional relationship among the weight 1, the magnetic fluid 2, the storage container 3, and the fluid pressure sensor 4.
  • three pairs (six) of pressure sensors were used on the X-axis, Y-axis, and Z-axis, respectively. Can be captured by a single sensor. In this case, the number of sensors can be reduced by half, and the calculation of data can be simplified accordingly.
  • a long pressure port from the gate located at the opposite electrode to the sensor position must be stored in the containment vessel.
  • CPU 5 analyzes the data from each pressure sensor and calculates the direction and magnitude of the acceleration of the measurement object.
  • the spherical weight 1 is supported in the containment vessel 3 by the magnetic fluid 2 in a non-contact manner, and thus can be measured in all directions without being restrained by the support.
  • the spherical weight 1 is supported in a non-contact manner by the magnetic fluid 2, so that the vibration suppression function by the buffering force of the magnetic fluid 2 Therefore, the vibration due to the natural frequency of the weight 1 can be suppressed low.
  • the acceleration acting on the spherical weight 1 does not displace the weight 1 but converts it into pressure on the magnetic fluid 2 around the weight 1. Therefore, the measurable acceleration range is the sensitivity range of the fluid pressure sensor 4, and the measuring range can be widened.
  • the containment vessel 3 has a spherical shape slightly larger than the weight 1, the distance between the weight 1 and the containment vessel 3 can be extremely narrow. Since the specific gravity of the weight 1 is adjusted to the apparent specific gravity of the magnetic fluid 2 in the magnetic field by the cavity 1a at the center thereof, the weight 1 floats almost in the center of the containment vessel 3. Can be. Therefore, the magnetic fluid 2 is in a thin and uniform distribution state on the surface of the weight 1, and is strongly and uniformly restrained by the magnetic field in the storage container 3.
  • the weight 1 when acceleration is applied to the three-axis accelerometer of the present invention, the weight 1 relatively moves in the containment vessel 3 in the direction opposite to the acceleration direction according to the law of inertia and is located in that direction. Acts to apply pressure to magnetic fluid 2. Conversely, the magnetic fluid 2 located on the opposite side of the weight 1 in the direction of acceleration acts to reduce the pressure.
  • fluid movement When such pressurization and decompression are applied to the magnetic fluid 2, fluid movement generally occurs from the pressurized portion to the depressurized portion.
  • the magnetic fluid 2 cannot flow from the pressurized portion to the depressurized portion, and as a result, generates a high-pressure portion and a low-pressure portion along the acceleration input axis. Therefore, by measuring the pressure distribution in the magnetic fluid 2, the direction of the acceleration input axis can be measured.
  • the magnitude and direction of the acceleration can be calculated by analyzing the magnitude and distribution of the measured pressure of the fluid pressure sensor 4 for each of the three axes by the CPU 5. Can be. That is, each fluid pressure sensor The pressure signal from 4 is sent to CPU 5 and the magnitude and direction of acceleration are calculated.
  • the effect of gravity is easy to calculate when the accelerometer is installed on a fixed object because the magnitude and direction of the gravitational acceleration are constant.
  • a vehicle that changes posture, such as a vehicle, it is necessary to provide information support for changes in posture, such as a gyrocompass and level.
  • an arbitrary acceleration in a three-dimensional direction is measured by a change in pressure of a magnetic fluid caused by displacement of a spherical weight stored in a storage container.
  • the structure is simpler and more accurate acceleration can be detected than conventional accelerometers based on size.
  • the range of sensitivity of the fluid pressure gauge can be expanded, and the magnitude of the acceleration from static acceleration to shocking and dynamic acceleration can be increased.
  • the measurable range can be greatly expanded.
  • an inertial guidance device be manufactured with a simple structure, but also it can be applied to a 3D mouse or the like as a three-dimensional position input device for a computer graphic.
  • the above availability is great.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

L'invention concerne un accéléromètre triaxial utilisant un fluide magnétique et consistant en un accéléromètre unique capable d'effectuer uniformément un grand nombre de mesures dans trois directions différentes sans aucune structure séismographique. L'accéléromètre comprend une masse sphérique, un contenant sphérique renfermant la masse sphérique, un fluide magnétique emprisonné entre la masse et le contenant sphérique, une pluralité d'aimants disposés à la surface de la masse sphérique de sorte qu'ils aient, de manière alternée, des polarités opposées pour agir sur le fluide magnétique et une pluralité de manomètres détectant les changements de pression dudit fluide magnétique, lorsqu'une accélération est appliquée sur la masse sphérique, agencés à la surface du contenant sphérique.
PCT/JP2000/006848 2000-03-27 2000-10-02 Accelerometre triaxial utilisant un fluide magnetique Ceased WO2001073449A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74526/00A AU7452600A (en) 2000-03-27 2000-10-02 Three-axis accelerometer using magnetic fluid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000087310A JP3311329B2 (ja) 1999-04-01 2000-03-27 磁性流体を用いた３軸加速度計
JP2000-87310 2000-03-27

Publications (1)

Publication Number Publication Date
WO2001073449A1 true WO2001073449A1 (fr) 2001-10-04

Family

ID=18603342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/006848 Ceased WO2001073449A1 (fr) 2000-03-27 2000-10-02 Accelerometre triaxial utilisant un fluide magnetique

Country Status (2)

Country Link
AU (1) AU7452600A (fr)
WO (1) WO2001073449A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007116211A1 (fr) * 2006-04-08 2007-10-18 Angela Pietraszko dispositif d'avertissement de la chute d'un objet
GB2450283A (en) * 2006-04-08 2008-12-17 Angela Pietraszko Dropped object warning device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043204A (en) * 1976-08-16 1977-08-23 The United States Of America As Represented By The Secretary Of The Army Magnetic fluid bearing accelerometer
US4706498A (en) * 1985-09-23 1987-11-17 Ferrotec, Inc. Apparatus and method for measuring movement
EP0293784A2 (fr) * 1987-05-30 1988-12-07 Nippon Soken, Inc. Capteur d'accélération
JPH08334529A (ja) * 1995-06-07 1996-12-17 Toyota Motor Corp 加速度センサ
US5780741A (en) * 1997-02-11 1998-07-14 Ferrofluidics Corporation Sensor employing a sliding magnet suspended on ferrofluid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043204A (en) * 1976-08-16 1977-08-23 The United States Of America As Represented By The Secretary Of The Army Magnetic fluid bearing accelerometer
US4706498A (en) * 1985-09-23 1987-11-17 Ferrotec, Inc. Apparatus and method for measuring movement
EP0293784A2 (fr) * 1987-05-30 1988-12-07 Nippon Soken, Inc. Capteur d'accélération
JPH08334529A (ja) * 1995-06-07 1996-12-17 Toyota Motor Corp 加速度センサ
US5780741A (en) * 1997-02-11 1998-07-14 Ferrofluidics Corporation Sensor employing a sliding magnet suspended on ferrofluid

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007116211A1 (fr) * 2006-04-08 2007-10-18 Angela Pietraszko dispositif d'avertissement de la chute d'un objet
GB2450283A (en) * 2006-04-08 2008-12-17 Angela Pietraszko Dropped object warning device
GB2450283B (en) * 2006-04-08 2011-11-16 Angela Pietraszko Dropped object warning device

Also Published As

Publication number Publication date
AU7452600A (en) 2001-10-08

Similar Documents

Publication Publication Date Title
CN101726752B (zh) 地震监测系统
JP4223554B2 (ja) 姿勢あるいは加速度の３次元的な測定のためのセンサ装置
JP6367458B2 (ja) センサ
JPH09501498A (ja) 傾斜計
CN101375129A (zh) 基于传感器的定向系统
CN103575932B (zh) 一种mems压阻式加速度计
JP2008537139A (ja) センサ装置を備える装置
CN102155944B (zh) 一种微型六轴集成加速度计陀螺仪的惯性传感器及其应用方法
Nour et al. A Novel Tilt and Acceleration Measurement System Based on Hall‐Effect Sensors Using Neural Networks
CN108872637B (zh) 一种两轴挠性摆式加速度计
CN111289772A (zh) 低深宽比的单质量块三轴mems惯性加速度计及其制备方法
CN106443069B (zh) 一种基于各向异性磁电阻效应的差分式单轴mems加速度计
CN106771360B (zh) 一种单轴mems加速度计
WO2001073449A1 (fr) Accelerometre triaxial utilisant un fluide magnetique
JP3311329B2 (ja) 磁性流体を用いた３軸加速度計
CN106338618B (zh) 一种基于巨磁电阻效应的单轴mems加速度计
CN114167082B (zh) 一种单晶硅挠性加速度计
Xu et al. Analytical and finite element analysis of a new tri-axial piezoelectric accelerometer
CN105841718B (zh) 一种跌倒传感器
CN106771354B (zh) 一种单轴mems加速度计
Denishev et al. Accelerometer design
CN106501547B (zh) 一种基于巨磁电阻效应的差分式单轴mems加速度计
CN106706959B (zh) 一种基于各向异性磁电阻效应的单轴mems加速度计
RU77446U1 (ru) Измеритель параметров движения
CN118443968B (zh) 隧道磁阻加速度计

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642