DE2706211A1 - DETECTOR RESPONDING TO PRESSURE - Google Patents
DETECTOR RESPONDING TO PRESSUREInfo
- Publication number
- DE2706211A1 DE2706211A1 DE19772706211 DE2706211A DE2706211A1 DE 2706211 A1 DE2706211 A1 DE 2706211A1 DE 19772706211 DE19772706211 DE 19772706211 DE 2706211 A DE2706211 A DE 2706211A DE 2706211 A1 DE2706211 A1 DE 2706211A1
- Authority
- DE
- Germany
- Prior art keywords
- conductors
- conductor
- detector
- outer conductor
- pvf
- 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
- 239000004020 conductor Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 17
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000005684 electric field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000007735 ion beam assisted deposition Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/02—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles
- G01G19/022—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing wheeled or rolling bodies in motion
- G01G19/024—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing wheeled or rolling bodies, e.g. vehicles for weighing wheeled or rolling bodies in motion using electrical weight-sensitive devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezoelectric or piezoresistive properties
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/60—Piezoelectric or electrostrictive devices having a coaxial cable structure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
Auf Druck ansprechender DetektorPressure sensitive detector
Die Erfindung betrifft einen auf Druck ansprechenden Detektor, der besonders, obwohl nicht ausschließlich, für die Aufgabe geeignet ist, die Durchfahrt von Straßenfahrzeugen anzuzeigen. Wenn Detektoren solcher Art durch die Durchfahrt eines Fahrzeugs aktiviert worden sind, dann erzeugen sie ein Signal, das für den Betrieb von Verkehrssignalen oder für das Zählen von Fahrzeugen, um Verkehrskontrolldaten zu erhalten, benützt werden kann.The invention relates to a pressure responsive detector which is particularly, although not exclusively, used for the task is suitable for indicating the passage of road vehicles. When detectors of this type by the passage of a vehicle have been activated, then they generate a signal that is used for the operation of traffic signals or for counting can be used by vehicles to obtain traffic control data.
Ein bekannter auf Druck ansprechender Fahrzeugdetektor enthält eine pneumatische Röhre, die in einem in der Straße versenkten Aufbau untergebracht sein kenn und die quer zur Fahrbahn liegt. Wenn ein Fahrzeug über die Röhre fährt, wird die Luft innerhalb der Röhre komprimiert und der Druckanstieg von einem durch eine Membran betätigten Schalter registriert, um so ein elektrisches Signal für weitere Verwendung zu erzeugen. Jedoch kann der bekannte Detektor leicht durch z.B. auf der Röhre bremsende Fahr-One known vehicle pressure responsive detector includes a pneumatic tube buried in one in the street The superstructure can be housed and that is perpendicular to the roadway. When a vehicle drives over the tube, the air gets inside the tube is compressed and the increase in pressure is registered by a switch operated by a membrane, creating an electrical Generate signal for further use. However, the known detector can easily be damaged by e.g.
B MÖNCHEN 22. ROBERT-KOCH-STRASSE I 7 STUTTGART 50 IBAD CANNSTATT» MÜNCHEN. KONTO-NUMMER 72 B MÖNCHEN 22. ROBERT-KOCH-STRASSE I 7 STUTTGART 50 IBAD CAN NSTATT »MUNICH. ACCOUNT NUMBER 72
zeuge beschädigt werden und neigt in manchen Fällen dazu, fehlerhafte Ausgangssignale zu erzeugen.damaged and in some cases tends to produce erroneous output signals.
Mit dieser Erfindung soll ein auf Druck ansprechender Detektor geschaffen werden, bei dem die vorhergehenden Probleme in bezug auf Robustheit und Zuverlässigkeit wenigstens verringert sind.The aim of this invention is to provide a pressure responsive detector which has the foregoing problems are at least reduced in terms of robustness and reliability.
Nach der Erfindung enthält ein auf Druck ansprechender Detektor einen röhrenförmigen äußeren Leiter, einen inneren Leiter, der innerhalb des äußeren Leiters angeordnet ist, und zwischen dem inneren und dem äußeren Leiter eine Schicht aus Poly(vinylidenfluorid) (PVFp)- Material, die polarisiert wurde, um piezoelektrische Eigenschaften anzunehmen, und die innerhalb des äußeren Leiters so angeordnet ist, daß sie auf äußeren Druck mit einem Spannungssignal reagiert; weiterhin enthält der Detektor Vorrichtungen, um von den Leitern die elektrischen Spannungen abzunehmen, die als Ergebnis des von außen angewendeten Drucks erzeugt wurden.According to the invention, a pressure sensitive detector includes a tubular outer conductor, an inner conductor, which is located inside the outer conductor, and a layer of poly (vinylidene fluoride) between the inner and outer conductors (PVFp) - material that has been polarized to take on piezoelectric properties and that resides within the outer conductor is arranged to respond to external pressure with a voltage signal; the detector also contains Devices for releasing the electrical voltages from the conductors as a result of external pressure were generated.
Vorzugsweise umgibt das PVFp-Material den inneren Leiter radial und füllt den inneren Raum zwischen dem inneren und äußeren Leiter. Üblicherweise enthält der Detektor ein Koaxialkabel mit einem zentralen Leiter, auf dem zentralen Leiter einen Überzug aus PVFp-Material, auf dem PVFp-Material einen geflochtenen koaxialen äußeren Leiter, und ein wetterfestes Material, das den äußeren Leiter radial umgibt und worin das PVFp-Material radial polarisiert wird, indem eine Spannung zwischen den Leitern angelegt wird.Preferably, the PVFp material radially surrounds the inner conductor and fills the inner space between the inner and outer conductors. The detector usually includes a coaxial cable a central conductor, on the central conductor a coating of PVFp material, on the PVFp material a braided coaxial outer conductor, and a weatherproof material radially surrounding the outer conductor and wherein the PVFp material radially is polarized by applying a voltage between the conductors will.
Vorzugsweise ist der Detektor so angeordnet, daß er in einem biegsamen Gehäuse befestigt werden kann, das geeigent ist, in eine mit einer Aussparung versehenen Straßenoberfläche eingesetzt zu werden.Preferably, the detector is arranged so that it can be mounted in a flexible housing which is suitable in a road surface provided with a recess to be used.
8098?/»/05268098? / »/ 0526
- et -- et -
itit
Die Erfindung wird nun an einem Beispiel nach beiliegender Zeichnung beschrieben, die einen Querschnitt des Detektors nach der Erfindung zeigt, der in einer mit einer Aussparung versehenen Straßenoberfläche befestigt ist.The invention will now be illustrated using an example as follows Description of the drawing which shows a cross section of the detector according to the invention, which is in one with a recess provided road surface is attached.
Der Detektor, der in der Zeichnung gezeigt wird, hat einen der Länge nach liegenden zentralen Leiter 1, einen geflochtenen koaxialen äußeren Leiter 2 und eine Schicht aux Poly (vinylidenfluorid) (PVPg)-Material 3, die den Raum zwischen Leiter 1 und Leiter 2 ausfüllt. Das PVF^Material wird radial polarisiert, indem eine Spannung von 3 kV zwischen dem inneren und dem äußeren Leiter 1 und 2 bei Temperaturen in der Gegend von 1OO°C für 30 Minuten angelegt wird und indem das elektrische Feld beibehalten wird, während die Temperatur auf Umgebungstemperatur verringert wird. Der äußere Leiter 2 ist mit einem wetterfesten Überzug 4 bedeckt, und der Detektor ist in einem biegsamen Gehäuse 5 befestigt, das aus synthetischem Gummi oder aus Epoxyharz besteht, und das in einer rechteckig geschnittenen Aussparung 6 einer Straßenoberfläche 7 liegt, so daß der Detektor rund 2 cm (3/4- inch) unter der Straßenoberfläche 7 verborgen liegt. Ein Ende des Detektors ist abgedichtet (nicht abgebildet), um ein Kurzschließen des inneren und äußeren Leiters zu verhindern, und die anderen Einden von Leiter 1, 2 sind an einen (nicht abgebildeten) Verstärker angeschlossen, um damit (ebenfalls nicht abgebildete) Anwendungsvorrichtungen zu betreiben. The detector shown in the drawing has one lengthwise central conductor 1, a braided one coaxial outer conductor 2 and a layer of aux poly (vinylidene fluoride) (PVPg) material 3 that fill the space between Head 1 and Head 2 fill out. The PVF ^ material becomes radial polarized by applying a voltage of 3 kV between the inner and outer conductors 1 and 2 at temperatures in the area of 100 ° C is applied for 30 minutes and the electrical Field is maintained while the temperature is reduced to ambient. The outer conductor 2 is with a covered weatherproof cover 4, and the detector is mounted in a flexible housing 5 made of synthetic rubber or made of epoxy resin, and which lies in a rectangular cut recess 6 of a road surface 7, so that the detector is about 2 cm (3/4 inch) below the road surface 7 is hidden. One end of the detector is sealed (not shown) to short circuit the interior and the outer conductor, and the other ends of conductor 1, 2 are connected to an amplifier (not shown), to operate application devices (also not shown).
Fährt bei Betrieb ein Straßenfahrzeug über das Gehäuse 5, so wird dadurch das Gehäuse zusammengedrückt und so ein äußerer Druck auf das PVF2-Material 3 ausgeübt, das daraufhin ein elektrisches Ausgangssignal zwischen den Leitern 1 und 2 erzeugt. Testversuche mit einem Detektor nacü dieser Erfindung erzeugten Ausgangssignale, die bei einigen Kilogramm Druckkraft (a few pounds pressure), ausgeübt auf den äußeren Leiter 2, 10 Volt überschritten.If a road vehicle drives over the housing 5 during operation, this compresses the housing and thus exerts an external pressure on the PVF 2 material 3, which then generates an electrical output signal between the conductors 1 and 2. Tests with a detector according to this invention produced output signals which, with a few pounds of pressure exerted on the outer conductor, exceeded 2, 10 volts.
- Patentansprüche 80982^/0526 - Claims 80982 ^ / 0526
Claims (4)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB51347/76A GB1544856A (en) | 1976-12-09 | 1976-12-09 | Pressure sensitive detectors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2706211A1 true DE2706211A1 (en) | 1978-06-15 |
Family
ID=10459647
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19772706211 Pending DE2706211A1 (en) | 1976-12-09 | 1977-02-14 | DETECTOR RESPONDING TO PRESSURE |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2706211A1 (en) |
FR (1) | FR2373784A1 (en) |
GB (1) | GB1544856A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2831939A1 (en) * | 1977-07-27 | 1979-02-01 | List Hans | MEASUREMENT TRANSDUCER WITH A PIEZOELECTRIC MEASURING ELEMENT |
DE3006656A1 (en) * | 1980-02-22 | 1981-09-17 | Robert Bosch Gmbh, 7000 Stuttgart | Seal acting simultaneously as pressure monitoring sensor - consists of multilayer annular or coaxial electrodes and of dielectric |
DE4101871A1 (en) * | 1991-01-23 | 1992-07-30 | Univ Leipzig | Pressure sensing flat seal - comprises piezoelectric sensor sheet between electrically insulating vapour-proof protective ones |
FR2813999A1 (en) * | 2000-09-14 | 2002-03-15 | Eurovia | METHOD OF LAYING INTO A PAVEMENT OF ELONGATE ELEMENTS FOR ALLOWING VEHICLE FLOWS |
US6526834B1 (en) | 2000-08-23 | 2003-03-04 | Measurement Specialties, Incorporated | Piezoelectric sensor |
DE102005041671A1 (en) * | 2005-09-01 | 2007-03-22 | Datacollect Traffic Systems Gmbh & Co. Kg | Data e.g. climatic data, determining device, has measuring device arranged such that movable units are brought into contact with device so that kinetic energy acting on device generates mechanical voltage that is converted into energy |
DE102016211102A1 (en) * | 2016-06-22 | 2017-12-28 | Robert Bosch Gmbh | Concept for collecting traffic information |
DE112015003110B4 (en) * | 2014-10-15 | 2021-01-14 | Chung-Ang University Industry-Academic Cooperation Foundation | Sensor unit that uses an electroactive polymer for wireless transmission / reception of deformation information, and sensor that uses this |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2468694A1 (en) * | 1979-10-31 | 1981-05-08 | Automatisme Cie Gle | Piezoelectric vehicle counting sensor cable - is surrounded by rubberised resin in channel across concrete roadway and avoids problem of multiple detectors |
FR2471066A1 (en) * | 1979-12-07 | 1981-06-12 | France Etat | Laying vehicle detecting cables in roadway - by surrounds piezoelectric filled coaxial cable with resilient cover set in resilient U=shaped layer to reduce vibration |
FR2482340A1 (en) * | 1980-05-08 | 1981-11-13 | Electronique Controle Mesure S | Underground piezoelectric traffic counter cable - uses piezoelectric cable laid in u=shape to both count and detect direction of passing vehicles on road |
FR2487555A1 (en) * | 1980-07-28 | 1982-01-29 | Automatisme Cie Gle | DETECTOR FOR PASSING WEIGHTED OBJECTS ON A PAVEMENT |
US4456013A (en) * | 1981-09-08 | 1984-06-26 | Brown University Research Foundation | Catheter |
GB8411480D0 (en) * | 1984-05-04 | 1984-06-13 | Raychem Corp | Sensor array |
GB8524237D0 (en) * | 1985-10-02 | 1985-11-06 | Raychem Gmbh | Pressure sensor |
JP2732128B2 (en) * | 1988-09-07 | 1998-03-25 | 日本特殊陶業株式会社 | Coaxial cable-shaped piezoelectric transducer and method of manufacturing the same |
CH683714A5 (en) * | 1990-12-19 | 1994-04-29 | Kk Holding Ag | Force sensor arrangement, in particular for the dynamic axle load, speed, center distance and total weight determination of vehicles. |
FR2881861B1 (en) * | 2005-02-08 | 2007-04-13 | Eco Compteur Sarl | DETECTOR FOR TRAFFIC COUNTER |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL221471A (en) * | 1957-10-09 | |||
JPS5029159B1 (en) * | 1970-12-02 | 1975-09-20 | ||
FR2145099A5 (en) * | 1971-07-08 | 1973-02-16 | Inst Francais Du Petrole | |
FR2233615B1 (en) * | 1973-06-12 | 1977-05-06 | Gen Dynamics Corp |
-
1976
- 1976-12-09 GB GB51347/76A patent/GB1544856A/en not_active Expired
-
1977
- 1977-02-14 DE DE19772706211 patent/DE2706211A1/en active Pending
- 1977-11-22 FR FR7735017A patent/FR2373784A1/en not_active Withdrawn
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2831939A1 (en) * | 1977-07-27 | 1979-02-01 | List Hans | MEASUREMENT TRANSDUCER WITH A PIEZOELECTRIC MEASURING ELEMENT |
DE3006656A1 (en) * | 1980-02-22 | 1981-09-17 | Robert Bosch Gmbh, 7000 Stuttgart | Seal acting simultaneously as pressure monitoring sensor - consists of multilayer annular or coaxial electrodes and of dielectric |
DE4101871A1 (en) * | 1991-01-23 | 1992-07-30 | Univ Leipzig | Pressure sensing flat seal - comprises piezoelectric sensor sheet between electrically insulating vapour-proof protective ones |
US6526834B1 (en) | 2000-08-23 | 2003-03-04 | Measurement Specialties, Incorporated | Piezoelectric sensor |
FR2813999A1 (en) * | 2000-09-14 | 2002-03-15 | Eurovia | METHOD OF LAYING INTO A PAVEMENT OF ELONGATE ELEMENTS FOR ALLOWING VEHICLE FLOWS |
EP1188864A1 (en) * | 2000-09-14 | 2002-03-20 | Eurovia | Method for installing in a road surface of elongated elements for the transport of flows |
DE102005041671A1 (en) * | 2005-09-01 | 2007-03-22 | Datacollect Traffic Systems Gmbh & Co. Kg | Data e.g. climatic data, determining device, has measuring device arranged such that movable units are brought into contact with device so that kinetic energy acting on device generates mechanical voltage that is converted into energy |
DE102005041671B4 (en) * | 2005-09-01 | 2008-01-31 | Datacollect Traffic Systems Gmbh & Co. Kg | Device for determining data |
DE112015003110B4 (en) * | 2014-10-15 | 2021-01-14 | Chung-Ang University Industry-Academic Cooperation Foundation | Sensor unit that uses an electroactive polymer for wireless transmission / reception of deformation information, and sensor that uses this |
DE102016211102A1 (en) * | 2016-06-22 | 2017-12-28 | Robert Bosch Gmbh | Concept for collecting traffic information |
Also Published As
Publication number | Publication date |
---|---|
FR2373784A1 (en) | 1978-07-07 |
GB1544856A (en) | 1979-04-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAP | Request for examination filed | ||
OD | Request for examination | ||
OHJ | Non-payment of the annual fee |