GB2375175A - Peizoelectric device for detecting or measuring the bending of objects - Google Patents
Peizoelectric device for detecting or measuring the bending of objects Download PDFInfo
- Publication number
- GB2375175A GB2375175A GB0110834A GB0110834A GB2375175A GB 2375175 A GB2375175 A GB 2375175A GB 0110834 A GB0110834 A GB 0110834A GB 0110834 A GB0110834 A GB 0110834A GB 2375175 A GB2375175 A GB 2375175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bending
- conductive
- measuring
- detecting
- layers
- 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.)
- Withdrawn
Links
- 238000005452 bending Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 230000035939 shock Effects 0.000 claims abstract description 4
- 230000001133 acceleration Effects 0.000 claims abstract description 3
- 238000012216 screening Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims abstract 2
- 239000000853 adhesive Substances 0.000 abstract description 4
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 abstract 4
- 239000012790 adhesive layer Substances 0.000 abstract 1
- 239000002033 PVDF binder Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Structure Of Printed Boards (AREA)
Abstract
The device is made of multiple layers of flexible material, including at least one piezoelectric layer 3 and at least one conductive layer 1. The layers can be very thin, producing a device suitable for use where space is limited. The device produces a large output signal and the conductive material may be arranged to provide screening from electromagnetic interference. The device is bonded to the object to be measured using adhesive 4, sealing the piezoelectric and conductive materials from the environment and preventing the ingress of substances that may damage them or impair their operation. The object has conductive areas arranged so that, in bonding the device and object together, the electrical connections to the device are made. Therefore layers 2 and 4 are conductive adhesive layers. When appropriately mounted on a suitable object of known mechanical characteristics, the device can be used to measure strain, shock and acceleration to which the object is subjected or bending of the object.
Description
<Desc/Clms Page number 1>
Piezoelectric device for detecting or measuring the bending of objects This invention relates to a piezoelectric device, which takes the form of a flexible laminated structure, for detecting or measuring the bending of objects. It is attached to an object, which must be capable of flexing, to some degree, in at least one plane, and produces an electric signal when that object is bent. The amplitude of this signal is approximately proportional to the rate and magnitude of bending.
Other mechanical, electromechanical and piezoelectric devices for measuring bending are well known, but may suffer from a number of disadvantages. These include- . Large physical size and weight * Mechanical complexity * Unreliable moving parts . Fragility
. Low output signal level * Susceptibility to electromagnetic interference * Susceptibility to ingress of substances which may damage the device or impair its operation . Difficult connection to electronic circuitry * Electrical output which is not proportional to the rate or magnitude of bending 'High cost The object of this invention is to provide a device, which overcomes all of the disadvantages listed above.
Accordingly this invention provides a device, which is made of multiple layers of flexible material including at least one piezoelectric layer and at least one conductive layer. These layers can be very thin, producing a device that may be used in
<Desc/Clms Page number 2>
applications where space is limited. The piezoelectric material produces a large output signal, and the conductive material may be arranged to provide screening from electromagnetic interference. The device is bonded to the object to be measured; this seals the piezoelectric and conductive materials from the environment, preventing the ingress of substances that may damage them or impair their operation. The object has conductive areas arranged so that, in bonding the device and object together, the electrical connections to'the device are made.
When appropriately mounted on a suitable object of known mechanical characteristics, the device can be used to measure strain, shock and acceleration to which the object is subjected. The top surface of the device may be printed and the device used as a label.
A preferred implementation of the invention will now be described with reference to the accompanying drawing on page 6 in which-
FIGURE 1 shows an exploded view of the arrangement of layers of material within the device
FIGURE 2 shows, In plan, where electrical connections are made to the device
FIGURE 3 shows an example application of the device As shown in FIGURE 1, the label is made up of four layers of material.
Layer 1 is a plastic substrate, with conductive silvered coating on its lower surface making an electrical connection, via layer 3 (conductive adhesive) to the upper surface of layer 2 (piezoelectric material). Layer 1 also provides shielding from electromagnetic interference. The upper surface of layer 1 may be printed, for example with product information or a logo.
Layer 2 is conductive adhesive.
<Desc/Clms Page number 3>
Layer 3 is the piezoelectric material. In this implementation, polarised Polyvinylidene Fluoride (PVDF) has been used. When this layer is bent, a voltage is produced between its upper and lower surfaces. This layer is smaller than the other layers, which enables an electrical connection to be made to its upper surface, via layers 1 and 2, from the object being measured.
Layer 4 is anisotropically conductive adhesive, which conducts electricity only in its zplane. This allows the adjacent layers to be electrically connected without shortcircuiting the upper and lower surfaces of the piezoelectric material.
As shown in FIGURE 2, electrical connections to the device are made in areas 5 and 6.
In FIGURE 3, the device 7 is shown bonded to a printed circuit board 8. The printed circuit board is mounted in enclosure 9 and is secured in position by fixings 10 at each end. If the enclosure is dropped, or subjected to a shock or impact, the printed circuit board will vibrate, causing the device to produce an electrical signal. This signal is processed by the electronic circuit (not shown) on the printed circuit board.
Claims (5)
- CLAIMS 1. A device for detecting and measuring the bending of objects, comprising multiple layers of flexible material including at least one piezoelectric layer and at least one conductive layer, which is bonded to the object to be measured, making the electrical connections and sealing the piezoelectric and conductive materials from the environment.
- 2. A device for detecting and measuring the bending of materials as claimed in Claim 1, wherein the conductive material is arranged to provide screening from electromagnetic interference.
- 3. A device for detecting and measuring the bending of materials as claimed in Claim 1 or Claim 2 which is bonded to a suitable object of known mechanical characteristics and used to measure strain, shock or acceleration to which the object is subjected.
- 4. A device for detecting and measuring the bending of materials as claimed in Claim 1, Claim 2 or Claim 3 wherein its top surface is printed and the device used as a label.
- 5. A device for detecting and measuring the bending of materials substantially as described herein with reference to Figures 1 to 3 of the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0110834A GB2375175A (en) | 2001-05-03 | 2001-05-03 | Peizoelectric device for detecting or measuring the bending of objects |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0110834A GB2375175A (en) | 2001-05-03 | 2001-05-03 | Peizoelectric device for detecting or measuring the bending of objects |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0110834D0 GB0110834D0 (en) | 2001-06-27 |
| GB2375175A true GB2375175A (en) | 2002-11-06 |
Family
ID=9913939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0110834A Withdrawn GB2375175A (en) | 2001-05-03 | 2001-05-03 | Peizoelectric device for detecting or measuring the bending of objects |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2375175A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020094559A1 (en) * | 2018-11-06 | 2020-05-14 | iNDTact GmbH | Electromechanical transducer with a layer structure |
| DE102019104677A1 (en) * | 2019-02-25 | 2020-08-27 | Ifm Electronic Gmbh | Motor vehicle door handle with a force sensor |
| CN112082674A (en) * | 2020-09-25 | 2020-12-15 | 长安大学 | Soil pressure measurement box based on positive flexoelectric effect |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5827198A (en) * | 1996-11-21 | 1998-10-27 | Flowscan, Inc. | Low-cost, disposable, polymer-based, differential output flexure sensor and method of fabricating same |
-
2001
- 2001-05-03 GB GB0110834A patent/GB2375175A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5827198A (en) * | 1996-11-21 | 1998-10-27 | Flowscan, Inc. | Low-cost, disposable, polymer-based, differential output flexure sensor and method of fabricating same |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020094559A1 (en) * | 2018-11-06 | 2020-05-14 | iNDTact GmbH | Electromechanical transducer with a layer structure |
| US12137615B2 (en) | 2018-11-06 | 2024-11-05 | iNDTact GmbH | Electromechanical transducer with a layer structure |
| DE102019104677A1 (en) * | 2019-02-25 | 2020-08-27 | Ifm Electronic Gmbh | Motor vehicle door handle with a force sensor |
| DE102019104677B4 (en) | 2019-02-25 | 2022-08-04 | Ifm Electronic Gmbh | Motor vehicle door handle with a force sensor |
| CN112082674A (en) * | 2020-09-25 | 2020-12-15 | 长安大学 | Soil pressure measurement box based on positive flexoelectric effect |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0110834D0 (en) | 2001-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |