WO2009047761A1 - A vibration sensor having a single virtual center of mass - Google Patents
A vibration sensor having a single virtual center of mass Download PDFInfo
- Publication number
- WO2009047761A1 WO2009047761A1 PCT/IL2008/001330 IL2008001330W WO2009047761A1 WO 2009047761 A1 WO2009047761 A1 WO 2009047761A1 IL 2008001330 W IL2008001330 W IL 2008001330W WO 2009047761 A1 WO2009047761 A1 WO 2009047761A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transducer
- center
- chamber
- vibration sensor
- pair
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
Definitions
- the present invention relates to the field of vibration sensors, and more particularly to vibration sensors arranged to measure spatial vibration in multiple axes.
- vibration may refer, for example, to an oscillation of a particle, particles, or elastic solid or surface, back and forth across a central position wherein the oscillation may or may not be periodic. Vibrations may originate in, inter alia, mechanical, hydrological or geological systems. Any vibration may be characterized by a changing level of spatial pressure exhibiting a measurable frequency and amplitude.
- transducer may refer, for example, to a device that converts the energy deriving from a pressure of a shock or a vibratory motion into another type of signal such as optical, mechanical, electrical signal or any other signal such that the converted signal is proportional to one or more motion parameters of the original vibratory signal.
- transducing element may refer, for example, to the portion of the transducer that converts the pressure energy of the vibration motion into a different type of signal.
- vibration sensors One of the challenges of vibration sensors is to determining the direction and the intensity of vibrations in various environments. Quantitative tempo-spatial information regarding vibrations is a valuable in many diverse technological fields, for example, seismic plotting of an earthquake, locating tunnel activity, and intrusion event detection. While various vibrations sensors are known in the art, the characteristics and therefore the limitations of such vibrations sensors are usually dictated by the particular technology of the transducers that are used to implement the vibration sensors.
- a method of measuring a vibratory signal in a single virtual center of mass of a vibration sensor comprising: centering a chamber surface around a center point; and measuring vibration from at least four measuring points in juxtaposition with the chamber surface, wherein at least two measuring points are located along a first axis passing through the center point and at least two measuring points are located along a second axis passing through the center point.
- a vibration sensor enabling measuring a vibratory signal in a single virtual center of mass of the sensor.
- the vibration sensor comprises: a chamber within the housing exhibiting a chamber center and chamber surface wherein all portions of the chamber surface are substantially equidistant from chamber center; and at least two pairs of vibration- sensitive transducers, wherein each transducer has a body including a first end portion, a second end portion and a central axis segment passing axially through the center of the body, between the first end portion and the second end portion; and wherein the first end portion is operatively associated with the chamber surface and includes a transuding element receptor portion; and wherein the second end portion is in operative association with the housing and each transducer pair of the two or more transducer pairs and includes an axis passing through the central segment of a first transducer, the chamber center, and the central segment of a second transducer.
- FIG. 1 is a high level flowchart showing a method of measuring a vibratory signal according to some embodiments of the present invention
- FIG. 2 is a high level schematic block diagram showing a system for measuring a vibratory signal according to some embodiments of the present invention
- FIG. 3 is a high level schematic mechanical diagram showing a vibration sensor according to some embodiments of the present invention
- FIG. 4 is a high level schematic block diagram showing a sensor signal processor according to some embodiments of the invention.
- Embodiments of the present invention provide a method, device and a system for measuring a vibration from an even number of equidistant points located within a chamber.
- FIG. 1 is a high level flowchart showing a method of measuring a vibratory signal according to some embodiments of the present invention.
- Embodiments of the method may comprise: centering a chamber surface around a center point 100; measuring vibration from at least four measuring points in juxtaposition with the chamber surface, wherein at least two measuring points are located along a first axis passing through the center point and at least two measuring points are located along a second axis passing through the center point 110; Optionally, amplifying measured signal from two or more of at least four measuring points 120; and further optionally, adding and subtracting the measured signals from two or more of at least four measuring points for extracting frequency and amplitude of the vibratory signal at the virtual center of mass of the sensor 130.
- FIG. 2 is a high level block diagram illustrating a vibration measurement system according to some embodiments of the invention.
- the system 10 comprises a vibration sensor 20 coupled to a sensor signal processor 30.
- system 10 is capable of measuring a plurality of axial components of a tempo spatial vibratory signal in a single virtual point wherein measuring is conducted in several points proximal to the virtual point but not at the virtual point. This is achieved by measuring vibrations along a plurality of N>2 axes and generating a plurality of 2N outputs.
- the 2N outputs may include N pairs of outputs corresponding to the N axes, respectively.
- a pair of outputs corresponding to an axis of the N axes may include a pair of values corresponding to a pair of vibration measurements along the axis.
- Sensor signal processor 30 is capable to process the axial components of the tempo spatial vibratory signal and produce in turn characterizing parameters of the vibratory signal such as frequency and amplitude. Specifically, sensor signal processor 30 may be arranged to generate one or more vibration output results based on one or more of the 2N output signals. For example, the results may include values corresponding to vibrations, e.g., magnitude, frequency and/or vector, along one or more of 2N axes.
- FIG. 3 is a high level mechanical diagram illustrating a vibration sensor 200 according to some embodiments of the invention. Vibration sensor 200 is arranged such that substantially all of the vibration measurements may be measured with respect to a single virtual mass center. Specifically, vibration sensor 200 may provide the 2N outputs substantially simultaneously.
- Vibration sensor 200 may include a chamber 210 within a housing 220.
- Chamber 210 may include a center 230 and surface 240 in which all portions of the surface are substantially equidistant from chamber center 230, e.g., as described below.
- Vibration sensor 200 may also include two or more pairs of vibration-sensitive transducers 250A-250D, wherein each transducer of each of the two or more pairs is adapted to communicate with at least one signal interpreter (not shown).
- Each of transducers 250A-250D has a body including a first end portion, a second end portion and a central axis segment passing axially through the center of the body, between the first end portion and the second end portion.
- the first end portion is operatively associated with chamber surface 240 and includes a transuding element receptor portion.
- the second end portion is in operative association with the housing and each transducer pair of the two or more transducer pairs 250A-B and 250C-D includes an axis passing through the central segment of a first transducer, the chamber center, and the central segment of a second transducer.
- the axes of the two or more transducer pairs 250A-B and 250C-D are planar and at least one first axis passing through at least one first transducer pair is at least one of perpendicular and obliquely angled, with respect to at least one second axis passing through at least one second transducer pair.
- the at least two transducer pairs 250A-B and 250C-D may comprise at least three transducer pairs, and the at least one third transducer pair that is at least one of the planar and oblique with respect to the plane of the at lest two planar transducer pairs and the at least one third transducer pair axis is perpendicular to the plane of the at least two transducer pairs 250 A-B and 250C-D.
- the at least three transducer pairs may comprise at least four transducer pairs, and include at least one fourth transducer pair angled 45 degrees to the two or more planar axes.
- each transducer of at least one transducer pair includes amplification housing.
- vibration sensor 200 may comprise a chamber 210 within a housing 220.
- Chamber 210 may be limited by a chamber wall surface 240.
- Vibration sensor 200 may include a plurality of 2N transducers 250A-D mounted to chamber wall surface 240, such that each pair of transducers 250A-D is mounted along a respective axis of the N axes.
- vibration sensor 200 may include a first pair of transducers 250A-B mounted to chamber surface wall 240 along axis A, and a second pair of transducers 250C-D mounted to chamber surface wall 240 along axis B.
- Chamber surface wall 240 may include, for example, a substantially rigid wall, e.g., a spherical vibration-transmitting chamber wall.
- the transducers may be mounted to chamber surface wall 240 using any suitable mounting method or element.
- Transducers 250 A-D may include any suitable type of Mass-spring transducer, as are known in the art and comprising a spring K coupled to a damper C via a mass M.
- Substantially all 2N transducers 250A-D may be located symmetrically with respect to a virtual mass center 230.
- a center of mass of the inertial masses, denoted M, of each of the transducers may be located at a predefined distance from virtual mass center 210.
- each pair of transducers 250A-B and 250C-D may include two transducers mounted to chamber surface wall 240 at opposite sides of axes A and B, respectively.
- each of the transducer pairs 250A-B and 250C-D may measure vibrations representing vibrations along axes A and B, respectively, of a signal mass located at virtual mass center 230.
- each of the transducers may have a body including a first end; a second end; and a central axis segment between the first and second ends that passing through the center of the body, each body including a port adapted to communicate with a signal interpreter.
- Each first transducer end may be operatively associated with the housing.
- Each second transducer end includes a transducing element operatively associated with the chamber surface wall 240.
- transducer pair 250A-B and transducer pair 250C-D are paired around chamber 210 so that a first axis passes through a first transducer of each pair, the center of the chamber and through a second transducer of each pair; the first and second transducer pairs providing vibration information from virtual mass center 240.
- the axes passing through the first and second transducer pairs are planar and perpendicular to each other. Planar axes, as used herein, may refer to axes that lie along a single flat plane.
- the sensor signal interpreter of FIG. 2 may use the output signals of transducers 250A-B and 250C-D, e.g., to characterize vibrations in magnitude, frequency and/or vector along axes A and/or B.
- the above description refers to a vibration sensor including two pairs of transducers 250A-B and 250C-D to measure vibrations along two axes A and B
- the sensor may include any other suitable numbers of pairs and transducers to measure vibrations along any other suitable number of axes.
- the sensor may implement three pairs of transducers located along at least three axes, which may be perpendicular to each other and thereby characterize vibrations in the X, Y, and Z axes.
- the axes can be orthogonal to each other.
- the axes may include two or more non-orthogonal axes, e.g. if N>3.
- FIG. 3 illustrates a spherical chamber surface wall 240, in other examples the chamber wall may have any other suitable shape.
- location of the transducer need not necessarily be equidistant respective of the center. Rather, each transducer may thus be located in a distance from the center that is in reverse proportion to the mass of each particular transducer. This ensures the differential measuring of vibration signals in a plurality of axes.
- sensor signal processor 30 is capable of processing signals measured by two pairs of transducers within the vibration sensor, each pair located on a different axis crossing the center of the vibration sensor.
- sensor signal processor 30 comprises an axis A analog conditioning module 310 and an axis B analog conditioning module 320, each analog conditioning module 310 and 320 comprises differential amplifiers 312-314 fed by two transducer pairs 150A-B and 150C-D, a notch filter 330 and 332, and a low pass filter 350 and 352.
- the outputs of axis A analog conditioning module 310 and axis B analog conditioning module 320 are fed to an analog to digital converter 370 and in turn to a digital signal processor 380.
- each differential amplifier is capable of subtracting two signals arriving from the same pair and further delivering the differential signal for further extraction of frequency and amplitude of the vibratory signal by digital signal processor 380.
- Sensor signal processor 30 can be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or in combinations thereof.
- Sensor signal processor 30 can be implemented advantageously in one or more computer programs that are executable on a programmable system including at least one programmable processor coupled to receive data and instructions from, and to transmit data and instructions to, a data storage system, at least one input device, and at least one output device.
- a computer program is a set of instructions that can be used, directly or indirectly, in a computer to perform a certain activity or bring about a certain result.
- a computer program can be written in any form of programming language, including compiled or interpreted languages, and it can be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
- Suitable processors for the execution of a program of instructions for processing tempo spatial vibratory signals include, by way of example, digital signal processors (DSPs) but also general purpose microprocessors, and the sole processor or one of multiple processors of any kind of computer.
- DSPs digital signal processors
- a processor will receive instructions and data from a read-only memory or a random access memory or both.
- the essential elements of a computer are a processor for executing instructions and one or more memories for storing instructions and data.
- the processor and the memory can be supplemented by, or incorporated in, ASICs (application-specific integrated circuits).
- an embodiment is an example or implementation of the inventions.
- the various appearances of "one embodiment,” “an embodiment” or “some embodiments” do not necessarily all refer to the same embodiments.
- various features of the invention may be described in the context of a single embodiment, the features may also be provided separately or in any suitable combination. Conversely, although the invention may be described herein in the context of separate embodiments for clarity, the invention may also be implemented in a single embodiment.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EA201070456A EA201070456A1 (en) | 2007-10-09 | 2008-10-07 | VIBRATION SENSOR WITH ONE VIRTUAL CENTER OF MASS |
MX2010003842A MX2010003842A (en) | 2007-10-09 | 2008-10-07 | A vibration sensor having a single virtual center of mass. |
BRPI0816648A BRPI0816648A2 (en) | 2007-10-09 | 2008-10-07 | vibration sensor and method for measuring a vibratory signal |
CN200880110128A CN101815930A (en) | 2007-10-09 | 2008-10-07 | Vibration transducer with single virtual center of mass |
CA2701182A CA2701182A1 (en) | 2007-10-09 | 2008-10-07 | A vibration sensor having a single virtual center of mass |
EP08808124A EP2215439A1 (en) | 2007-10-09 | 2008-10-07 | A vibration sensor having a single virtual center of mass |
IL204753A IL204753A0 (en) | 2007-10-09 | 2010-03-25 | A vibration sensor having a single virtual center of mass |
ZA2010/02447A ZA201002447B (en) | 2007-10-09 | 2010-04-08 | A vibration sensor having a single virtual center of mass |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US97844807P | 2007-10-09 | 2007-10-09 | |
US60/978,448 | 2007-10-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009047761A1 true WO2009047761A1 (en) | 2009-04-16 |
Family
ID=40293825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IL2008/001330 WO2009047761A1 (en) | 2007-10-09 | 2008-10-07 | A vibration sensor having a single virtual center of mass |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP2215439A1 (en) |
KR (1) | KR20100092434A (en) |
CN (1) | CN101815930A (en) |
BR (1) | BRPI0816648A2 (en) |
CA (1) | CA2701182A1 (en) |
EA (1) | EA201070456A1 (en) |
MX (1) | MX2010003842A (en) |
WO (1) | WO2009047761A1 (en) |
ZA (1) | ZA201002447B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10666867B2 (en) * | 2018-02-19 | 2020-05-26 | Olympus Corporation | Lens barrel, image pickup apparatus |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114697616A (en) * | 2022-03-09 | 2022-07-01 | 江苏钜熙矿用设备科技有限公司 | Multifunctional monitoring and recording system for explosion-proof device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2446494A1 (en) * | 1978-12-11 | 1980-08-08 | Geophysique Cie Gle | Detector system for recording seismic data - comprises geophones mounted in symmetrical arrangement around vertical axis allowing identical coupling |
US4893930A (en) * | 1988-01-25 | 1990-01-16 | The United States Of America As Represented By The Secretary Of The Navy | Multiple axis, fiber optic interferometric seismic sensor |
US20040204860A1 (en) * | 2003-03-31 | 2004-10-14 | Council Of Scientific And Industrial Research | Method for selective recording of SH waves using an array of sensors to filter out all non SH waves |
WO2006011145A2 (en) * | 2004-07-26 | 2006-02-02 | Spider Technologies Security Ltd | Vibration sensor |
US20060219016A1 (en) * | 2005-03-31 | 2006-10-05 | Li-Peng Wang | Silicon micromachined ultra-sensitive vibration spectrum sensor array (VSSA) |
-
2008
- 2008-10-07 MX MX2010003842A patent/MX2010003842A/en not_active Application Discontinuation
- 2008-10-07 WO PCT/IL2008/001330 patent/WO2009047761A1/en active Application Filing
- 2008-10-07 KR KR1020107010045A patent/KR20100092434A/en not_active Application Discontinuation
- 2008-10-07 EP EP08808124A patent/EP2215439A1/en not_active Withdrawn
- 2008-10-07 CN CN200880110128A patent/CN101815930A/en active Pending
- 2008-10-07 BR BRPI0816648A patent/BRPI0816648A2/en not_active IP Right Cessation
- 2008-10-07 EA EA201070456A patent/EA201070456A1/en unknown
- 2008-10-07 CA CA2701182A patent/CA2701182A1/en not_active Abandoned
-
2010
- 2010-04-08 ZA ZA2010/02447A patent/ZA201002447B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2446494A1 (en) * | 1978-12-11 | 1980-08-08 | Geophysique Cie Gle | Detector system for recording seismic data - comprises geophones mounted in symmetrical arrangement around vertical axis allowing identical coupling |
US4893930A (en) * | 1988-01-25 | 1990-01-16 | The United States Of America As Represented By The Secretary Of The Navy | Multiple axis, fiber optic interferometric seismic sensor |
US20040204860A1 (en) * | 2003-03-31 | 2004-10-14 | Council Of Scientific And Industrial Research | Method for selective recording of SH waves using an array of sensors to filter out all non SH waves |
WO2006011145A2 (en) * | 2004-07-26 | 2006-02-02 | Spider Technologies Security Ltd | Vibration sensor |
US20060219016A1 (en) * | 2005-03-31 | 2006-10-05 | Li-Peng Wang | Silicon micromachined ultra-sensitive vibration spectrum sensor array (VSSA) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10666867B2 (en) * | 2018-02-19 | 2020-05-26 | Olympus Corporation | Lens barrel, image pickup apparatus |
Also Published As
Publication number | Publication date |
---|---|
MX2010003842A (en) | 2010-05-27 |
EA201070456A1 (en) | 2010-10-29 |
EP2215439A1 (en) | 2010-08-11 |
KR20100092434A (en) | 2010-08-20 |
CN101815930A (en) | 2010-08-25 |
BRPI0816648A2 (en) | 2016-10-04 |
ZA201002447B (en) | 2010-12-29 |
CA2701182A1 (en) | 2009-04-16 |
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