WO1998020470B1 - Residual charge effect traffic sensor - Google Patents
Residual charge effect traffic sensorInfo
- Publication number
- WO1998020470B1 WO1998020470B1 PCT/US1997/019971 US9719971W WO9820470B1 WO 1998020470 B1 WO1998020470 B1 WO 1998020470B1 US 9719971 W US9719971 W US 9719971W WO 9820470 B1 WO9820470 B1 WO 9820470B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dielectric
- sensor according
- traffic sensor
- conductive
- conductive member
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 claims abstract 11
- 239000003989 dielectric material Substances 0.000 claims abstract 7
- 206010063834 Oversensing Diseases 0.000 claims abstract 2
- 230000005684 electric field Effects 0.000 claims 7
- 230000003068 static Effects 0.000 claims 4
- 238000002955 isolation Methods 0.000 claims 2
- 239000004809 Teflon Substances 0.000 claims 1
- 230000001070 adhesive Effects 0.000 claims 1
- 239000000853 adhesive Substances 0.000 claims 1
- 230000000875 corresponding Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 1
Abstract
A traffic sensor for monitoring the number and speed of vehicles traveling in multiple lanes of a roadway employing dielectrics (6, 8) with naturally occurring residual charges and includes a housing containing a cavity (44, 48), a conductive mounting bar (46) adapted to fit within the cavity, at least two sensing elements (2, 4) including the dielectrics (6, 8) mounted on the mounting bar so as to generate a signal when impacted by a vehicle tire. A transmission cable (14, 16) connects with the sensing elements for transmitting the electric signals generated by the sensing elements to analyzing equipment for evaluating, displaying, and recording the data generated by the sensing elements. Signals are transmitted through every other wire of the transmission cable to minimize cross-talk between the signal carrying wires.
Claims
1. A traffic sensor for monitoring vehicles traveling in a roadway comprising an impact sensing element having a first elongated dielectric (6) , a first elongated conductive member (2) , a second elongated dielectric (8) adjacent said first dielectric and a second conductive member (4) adjacent said second dielectric, said impact sensing element being characterized in that at least one of said dielectrics (6, 8) has a naturally occurring first residual charge adapted to gravitate toward an interface formed between a surface of one of the conductive members (2, 4) and said at least one of said dielectrics (6, 8) to thereby cause a static electric field to be generated, and at least one of said conductive members (2) is disposed for movement in said electric field so as to cause a disturbance of said field and a signal pulse to be generated upon movement of said at least one of said conductive members (2, 4) in said static electric field.
2. A traffic sensor as set forth in claim 1, further characterized in that said second dielectric (8) is air.
3. A traffic sensor according to claim 1, wherein said first (6) and second dielectrics (8) are different, have different dielectric constants and at least one of said dielectrics is compressible.
4. A traffic sensor according to claim 1, further characterized in that said sensing element ((Fig. 4a), 6) is a coaxial cable wherein the first conductive member (30, 140) is a centrally disposed elongated wire, said first dielectric (32, 142) surrounds said wire, said second dielectric surrounds said first dielectric and said second conductive member (38, 144) surrounds said second dielectric .
5. A traffic sensor according to claim 3, characterized in that the second conductive member is a conductive elastomeric material of a preselected configuration.
6. A traffic sensor according to claim 1, wherein said second dielectric has a second residual charge adapted to gravitate toward an interface between the surface of the second dielectric and the second conductive member, the resultant first and second residual charges coacting to form a resultant static electric field adapted to cause a signal pulse to be generated upon a disturbance of said resultant electric field upon movement of at least one of said conductive members.
7. A traffic sensor according to claim 1, wherein said second dielectric has a second residual charge adapted to gravitate toward an interface between the surface of the second dielectric and the second conductive member, said second residual charge being opposite in polarity to the first residual charge, said first and second residual charges coacting with each other to form a resultant static electric field adapted to cause a signal pulse to be generated upon a disturbance of said resultant electric field upon movement of at least one of said conductive members.
8. A traffic sensor according to claim 1, wherein said first conductive member is an elongated conductive housing (150) containing an elongated cavity (152) within which is disposed said second conductive member (160) and said first and said second dielectrics ((160b), 162), said housing (150) adapted to be disposed on a roadway to monitor traffic on at least one lane of said roadway.
9. A traffic sensor according to claim 8, wherein said second conductive member (160) comprises a conductive element (160a) disposed within a cavity (152) in said first conductive member (160) and a plurality of sensing elements are disposed along said" cavity (152) for monitoring a plurality of traffic lanes of the roadway and further including a transmission cable (166) connected to said sensing elements for carrying electric signals corresponding to signal pulse generated.
10. A traffic sensor according to claim 8, wherein the first elongated conductive member and first elongated dielectric correspond, respectively, to a conductive central wire (160) and a dielectric covering (160b) on said wire.
11. A traffic sensor according to claim 8, wherein said first dielectric is a polymer.
12. A traffic sensor according to claim 9, wherein said first dielectric is teflon.
13. A traffic sensor according to claim 9, wherein said transmission cable (166) is a ribbon cable having a plurality of wires, (172) each of said wires (172) adapted for connection to a separate sensing element for transmission of electric signals for monitoring the plurality of traffic lanes of the roadway.
14. A traffic sensor according to claim 9, wherein said transmission cable (166) is a ribbon cable having a plurality of wires (172) said plurality of wires including active wires (178, 184, 188 and 192) for carrying electric signals from the sensing elements and isolation wires (180, 182, 186 and 190) which are grounded for minimizing cross talk between the active wires .
15. A traffic sensor according to claim 9, further including a bundled coaxial cable (194) , said bundled coaxial cable being connected to active wires of the sensing elements.
16. A traffic sensor according to claim 8, further characterized in that said housing (150) contains an elongated channel (156) adjacent said cavity (152) , said elongated channel (156) being shaped to receive at least a portion of the sensing element, and further characterized in that air (162) is present in said housing channel, the air serving as the second dielectric of the sensing element.
17. A traffic sensor according to claim 13, including a mounting bar (154) contained in a second elongated channel (164) adapted to receive said transmission cable.
18. A traffic sensor according to claim 13, further characterized in that a conductive strip (168) is disposed between said transmission cable (166) and said housing (150) for isolation of signals generated by the transmission cable.
19. A traffic sensor according to claim 13, further including a layer of adhesive (167) arranged between said conductive element (154) and said transmission cable (166) for minimizing vibration of said transmission cable upon impact by a vehicle tire.
20. A traffic sensor according to claim 13, further characterized in that said housing (150) includes an access opening (155) affording access to said housing cavity .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/745,120 US5835027A (en) | 1996-11-07 | 1996-11-07 | Residual charge effect traffic sensor |
| US08/745,120 | 1996-11-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998020470A1 WO1998020470A1 (en) | 1998-05-14 |
| WO1998020470B1 true WO1998020470B1 (en) | 1998-07-23 |
Family
ID=24995331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/019971 WO1998020470A1 (en) | 1996-11-07 | 1997-11-07 | Residual charge effect traffic sensor |
Country Status (2)
| Country | Link |
|---|---|
| US (2) | US5835027A (en) |
| WO (1) | WO1998020470A1 (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7418407B2 (en) * | 1999-10-14 | 2008-08-26 | Jarbridge, Inc. | Method for electronic gifting using merging images |
| US6367332B1 (en) * | 1999-12-10 | 2002-04-09 | Joseph R. Fisher | Triboelectric sensor and methods for manufacturing |
| US6744378B1 (en) | 2000-09-01 | 2004-06-01 | Traffic Monitoring Services, Inc. | Roadway sensor with improved insulated signal carrying wires |
| US6417785B1 (en) * | 2000-09-01 | 2002-07-09 | Traffic Monitoring Services, Inc. | Permanent in-pavement roadway traffic sensor system |
| US6326902B1 (en) | 2000-09-01 | 2001-12-04 | Traffic Monitoring Services, Inc. | Residual charge-effect traffic sensor |
| US6300883B1 (en) | 2000-09-01 | 2001-10-09 | Traffic Monitoring Services, Inc. | Traffic recording system |
| US6830806B2 (en) * | 2001-04-12 | 2004-12-14 | Kreido Laboratories | Methods of manufacture of electric circuit substrates and components having multiple electric characteristics and substrates and components so manufactured |
| US7109888B2 (en) | 2002-01-18 | 2006-09-19 | Alion Science & Tech Corp | Method and apparatus for detecting and destroying intruders |
| US6888658B2 (en) * | 2002-05-31 | 2005-05-03 | Lucent Technologies Inc. | Method and geometry for reducing drift in electrostatically actuated devices |
| US6847126B2 (en) * | 2003-02-25 | 2005-01-25 | Michelin Recherche Et Technique S.A. | System and method for harvesting electric power from a rotating tire's static electricity |
| US20050127677A1 (en) * | 2003-12-03 | 2005-06-16 | Luttrull Jeffrey K. | Roadway generating electrical power by incorporating piezoelectric materials |
| DE102013100624A1 (en) * | 2013-01-22 | 2014-07-24 | Continental Automotive Gmbh | Impact sensor with triboelectric effect for a motor vehicle |
| US10042446B2 (en) | 2013-08-13 | 2018-08-07 | Samsung Electronics Company, Ltd. | Interaction modes for object-device interactions |
| US9569055B2 (en) | 2013-08-13 | 2017-02-14 | Samsung Electronics Company, Ltd. | Interaction sensing |
| FR3019291B1 (en) * | 2014-03-31 | 2017-12-01 | Institut Francais Des Sciences Et Technologies Des Transp De L'amenagement Et Des Reseaux | ACQUISITION DEVICE, METHOD FOR MANUFACTURING THE SAME, FORCE MEASURING METHOD |
| PL3029435T3 (en) * | 2014-12-01 | 2018-08-31 | Haenni Instruments Ag | Force sensor for detecting the weight of a vehicle |
| WO2016087063A1 (en) * | 2014-12-03 | 2016-06-09 | Grundfos Holding A/S | Sensor assembly |
| US11199438B2 (en) * | 2019-08-16 | 2021-12-14 | Advanced Energy Industries, Inc. | Triboelectric-based cable sensors |
| US11614375B2 (en) * | 2019-12-19 | 2023-03-28 | City University Of Hong Kong | Electromechanical sensor, a method of producing such sensor and a wearable device including such sensor |
Family Cites Families (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2740184A (en) * | 1951-03-01 | 1956-04-03 | Albert G Thomas | Electrically charged material |
| US3632443A (en) * | 1968-04-27 | 1972-01-04 | Sony Corp | Method of making polypropylene electrets |
| US3652932A (en) * | 1970-07-30 | 1972-03-28 | Bell Telephone Labor Inc | Method and apparatus for measurement of surface charge of an electret |
| US3668417A (en) * | 1970-12-28 | 1972-06-06 | Bell Telephone Labor Inc | Touch-sensitive switch employing electret foil |
| US3763482A (en) * | 1971-02-01 | 1973-10-02 | Gte Sylvania Inc | Coaxial cable transducer |
| US3736436A (en) * | 1971-11-04 | 1973-05-29 | Mc Donnell Douglas Corp | Electret pressure transducer |
| US3809828A (en) * | 1972-01-17 | 1974-05-07 | Gte Laboratories Inc | Electret transducing device |
| BE794109A (en) * | 1972-01-18 | 1973-05-16 | Western Electric Co | MULTI-UNIT ELECTRET BUTTON SELECTOR |
| FR2192344B1 (en) * | 1972-07-07 | 1975-03-07 | Thomson Csf | |
| US3911390A (en) * | 1973-11-07 | 1975-10-07 | Richard H Myers | Traffic sensor strip |
| US3940974A (en) * | 1974-05-06 | 1976-03-02 | Minnesota Mining And Manufacturing Company | Electrically compensated sensor |
| US4183010A (en) * | 1975-12-08 | 1980-01-08 | Gte Sylvania Incorporated | Pressure compensating coaxial line hydrophone and method |
| US4040044A (en) * | 1976-08-30 | 1977-08-02 | Gte Sylvania Incorporated | Dual line electret transducer |
| FR2397120A1 (en) * | 1977-07-04 | 1979-02-02 | Lewiner Jacques | IMPROVEMENTS IN ELECTROMECHANICAL TRANSDUCERS |
| FR2472901A1 (en) * | 1979-12-28 | 1981-07-03 | Thomson Csf | BIMORPHIC TRANSDUCER IN POLYMER MATERIAL |
| US5196846A (en) * | 1980-02-13 | 1993-03-23 | Brockelsby William K | Moving vehicle identification system |
| US4374299A (en) * | 1980-05-19 | 1983-02-15 | Belden Corporation | Triboelectric transducer cable |
| US4441038A (en) * | 1980-06-30 | 1984-04-03 | Tokyo Shibaura Denki Kabushiki Kaisha | Electret device |
| US4443711A (en) * | 1980-06-30 | 1984-04-17 | Tokyo Shibaura Denki Kabushiki Kaisha | Electret device |
| US4390800A (en) * | 1980-06-30 | 1983-06-28 | Tokyo Shibaura Denki Kabushiki Kaisha | Electret device |
| FR2487555A1 (en) * | 1980-07-28 | 1982-01-29 | Automatisme Cie Gle | DETECTOR FOR PASSING WEIGHTED OBJECTS ON A PAVEMENT |
| US4495541A (en) * | 1983-09-02 | 1985-01-22 | Gte Communication Products Corporation | Apparatus for and method of making an electret tape |
| US4612145A (en) * | 1984-03-26 | 1986-09-16 | At&T Bell Laboratories | Method for producing electret-containing devices |
| GB8524237D0 (en) * | 1985-10-02 | 1985-11-06 | Raychem Gmbh | Pressure sensor |
| DE3855467T2 (en) * | 1987-04-02 | 1997-02-06 | Gebert | Traffic measurement system |
| FR2632737B1 (en) * | 1988-06-10 | 1992-12-24 | Thomson Csf | METHOD FOR OBTAINING A NON-LINEAR ELECTROOPTICAL EFFECT GENERATOR, STRUCTURE OBTAINED AND APPLICATIONS |
| US5115109A (en) * | 1988-08-17 | 1992-05-19 | Fisher James R | Speed detector for traffic control |
| ATE160893T1 (en) * | 1989-03-10 | 1997-12-15 | Franz Josef Gebert | CABLE INSTALLATION FOR MONITORING ROAD TRAFFIC |
| US5463385A (en) * | 1989-05-03 | 1995-10-31 | Mitron Systems Corporation | Roadway sensor systems |
| US5448232A (en) * | 1989-05-03 | 1995-09-05 | Mitron Systems Corporation | Roadway sensors and method of installing same |
| US5450077A (en) * | 1989-05-03 | 1995-09-12 | Mitron Systems Corporation | Roadway sensor systems |
| FR2662006A1 (en) * | 1990-05-11 | 1991-11-15 | Thermocoax Cie | DEVICE FOR DETECTING DATA RELATING TO THE PASSAGE OF VEHICLES ON A PAVEMENT. |
| US5554907A (en) * | 1992-05-08 | 1996-09-10 | Mitron Systems Corporation | Vehicle speed measurement apparatus |
| US5486820A (en) * | 1992-12-18 | 1996-01-23 | The Whitaker Corporation | Traffic sensor having piezoelectric sensors which distinguish lanes |
| US5477217A (en) * | 1994-02-18 | 1995-12-19 | International Road Dynamics | Bidirectional road traffic sensor |
| EP0675472A1 (en) * | 1994-03-30 | 1995-10-04 | Thermocoax | Device for the detection of data of passing vehicles on a road |
-
1996
- 1996-11-07 US US08/745,120 patent/US5835027A/en not_active Expired - Fee Related
-
1997
- 1997-11-07 WO PCT/US1997/019971 patent/WO1998020470A1/en active Application Filing
-
1998
- 1998-08-31 US US09/144,102 patent/US6130627A/en not_active Expired - Fee Related
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