JP5281894B2 - 交通感知及びモニタリング装置、ならびに交通を感知及びモニタリングする方法 - Google Patents
交通感知及びモニタリング装置、ならびに交通を感知及びモニタリングする方法 Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 14
- 238000012806 monitoring device Methods 0.000 title claims description 11
- 239000000835 fiber Substances 0.000 claims abstract description 68
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 230000005855 radiation Effects 0.000 claims abstract description 34
- 230000003111 delayed effect Effects 0.000 claims abstract description 8
- 230000008033 biological extinction Effects 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 6
- 230000010287 polarization Effects 0.000 claims description 3
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- 230000001939 inductive effect Effects 0.000 description 4
- 230000001934 delay Effects 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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- 238000005305 interferometry Methods 0.000 description 1
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- 238000009420 retrofitting Methods 0.000 description 1
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F11/00—Road engineering aspects of Embedding pads or other sensitive devices in paving or other road surfaces, e.g. traffic detectors, vehicle-operated pressure-sensitive actuators, devices for monitoring atmospheric or road conditions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35361—Sensor working in reflection using backscattering to detect the measured quantity using elastic backscattering to detect the measured quantity, e.g. using Rayleigh backscattering
-
- 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
-
- 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
- G08G1/04—Detecting movement of traffic to be counted or controlled using optical or ultrasonic detectors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Traffic Control Systems (AREA)
- Devices For Checking Fares Or Tickets At Control Points (AREA)
Description
Claims (16)
- 長さlの光ファイバと、
一連のパルス対を光ファイバの入力端内に導入するように構成された手段と
を備える交通感知及びモニタリング装置にして、
パルス対の各々が、周波数差Ωを有する放射の第1及び第2のパルスを備え、第2のパルスが、遅延τだけ第1のパルスに対して遅延され、
入力端に向かって光ファイバ内でレイリー後方散乱された放射を検出し、かつ、それに応答して出力信号を生成するように構成された光検出器を更に備える、交通感知及びモニタリング装置であって、
光検出器の出力信号をサンプリングすることによって一組の信号サンプルを取得し、かつ、信号サンプルを処理して当該サンプルからなる信号の周波数又は位相に対応する出力信号を生成するように構成され、光ファイバにおける光の速度vに関し、信号サンプルが、レイリー後方散乱された、距離vτ/2だけ離れた一対の位置からの放射に相当する応答システムを更に備え、
複数の組の信号サンプルが、各パルス対の第1のパルスが光ファイバに入った後に、時間t0−Δt、t0及びt0+Δtにて光検出器の出力信号をサンプリングすることによって取得され、かつ、ほぼΩの周波数を有する最大信号に対応する信号サンプルを有する組が交通感知及びモニタリングのために処理され、周波数のΩに対する偏差又はその位相偏差が、移動中の車両の存在を示すことを特徴とする、交通感知及びモニタリング装置。 - 一連のパルス対を光ファイバの入力端内に導入するように構成された手段が、v/2l又はこれよりも低いレートで動作するように構成される、請求項1に記載の装置。
- vτ/2が、交通感知及びモニタリングのための一単位の長さに実質的に対応する、請求項1又は2に記載の装置。
- 応答システムが、第1の組のサンプルが対応する信号を少なくとも所定の量だけ上回る信号に第2の組のサンプルが対応するときに、処理される組を第1の組から第2の組に変えるように構成される、請求項1から3のいずれか一項に記載の装置。
- 応答システムが、処理される組が第1の組から第2の組に変えられたときに、両方の組が、第1及び第2の出力信号を生成するように一期間にわたって処理されるように構成され、応答システムが、更に、第2の出力信号と第1の出力信号の差を評価し、対応するオフセットを第2の出力信号に適用して第1及び第2の出力信号間の前記差を低減するように構成される、請求項1から4のいずれか一項に記載の装置。
- Δt≦τ/10である、請求項1から5のいずれか一項に記載の装置。
- 光ファイバが、標準的な光ファイバである、請求項1から6のいずれか一項に記載の装置。
- 光ファイバが、偏光維持ファイバであり、一連のパルス対を光ファイバの入力端内に導入するように構成された手段が、放射個別パルスがファイバの主軸に沿って偏光されるように前記ファイバ内に偏光パルス対を送り出すように構成される、請求項1から6のいずれか一項に記載の装置。
- 一連のパルス対を光ファイバの入力端内に導入するように構成された手段が、レーザの出力を受光するように且つパルス放射を第1及び第2の音響光学変調器(AOM)に出力するように構成された光変調器を含み、前記第1及び第2の音響光学変調器が、それぞれ、周波数ω1の放射の第1のパルスと、周波数ω2の放射の第2のパルスとを出力するように構成されており、各AOMが、変調器によって出力された各パルスの一部を受け取り、各AOMが、パルスを含む時間ウィンドウの外側でAOMへのパルス入力の消光比を増大するように構成されている、請求項1から8のいずれか一項に記載の装置。
- 変調器が、一体式光変調器又は半導体光増幅器である、請求項9に記載の装置。
- 一連のパルス対を光ファイバの入力端内に導入するように構成された手段が、cwレーザと、レーザの光学的出力を受光するように、かつ、各々が第1及び第2のパルスを備える一連のパルス対を生成するように構成されたAOMとを備え、パルスが、周波数差Ωを有し、第2のパルスが、第1のパルスに対して遅延τだけ遅延される、請求項1から8のいずれか一項に記載の装置。
- Ωが、40kHz≦Ω≦40MHzの範囲にある、請求項1から11のいずれか一項に記載の装置。
- (i)表面を使用する車両の重量が光ファイバに作用するように、車両を担持する表面上に又は表面より下方に光ファイバを設置するステップと、
(ii)一連のパルス対を光ファイバの入力端内に導入するステップであって、パルス対の各々が、周波数差Ωを有する放射の第1及び第2のパルスを備え、第2のパルスが、遅延τだけ第1のパルスに対して遅延されるステップと、
(iii)入力端に向かって光ファイバ内でレイリー後方散乱された放射を検出し、それに応答して出力信号を生成するステップと
を備える、交通を感知及びモニタリングする方法であって、
(iv)各パルス対の第1のパルスが光ファイバに入った後に、時間t0−Δt、t0及びt0+Δtにて光検出器の出力信号をサンプリングして、複数の組の信号サンプルを取得するステップであって、光ファイバにおける光の速度vに関し、それぞれの組の信号サンプルが、レイリー後方散乱された、距離vτ/2だけ離れた一対の位置からの放射に相当するステップと、
(v)ステップ(iv)において取得された信号サンプルを処理して、当該サンプルからなる信号の周波数又は位相に対応する出力信号を生成するステップと
を更に備え、
ステップ(v)は、ほぼΩの周波数を有する最大信号に対応する信号サンプルを有する組を交通感知及びモニタリングのために処理し、周波数のΩに対する偏差又はその位相偏差が、移動中の車両の存在を示す、交通を感知及びモニタリングする方法。 - 一連のパルス対が、v/2l又はこれよりも低いレートで前記光ファイバの入力端内に導入される、請求項13に記載の方法。
- vτ/2が、交通感知及びモニタリングのための一単位の長さに実質的に対応する、請求項13又は14に記載の方法。
- Δt≦τ/10である、請求項13から15のいずれか一項に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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GBGB0521713.8A GB0521713D0 (en) | 2005-10-25 | 2005-10-25 | Traffic sensing and monitoring apparatus |
GB0521713.8 | 2005-10-25 | ||
PCT/GB2006/003862 WO2007049004A1 (en) | 2005-10-25 | 2006-10-18 | Traffic sensing and monitoring apparatus |
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JP2009514081A JP2009514081A (ja) | 2009-04-02 |
JP2009514081A5 JP2009514081A5 (ja) | 2010-10-28 |
JP5281894B2 true JP5281894B2 (ja) | 2013-09-04 |
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US (1) | US7652245B2 (ja) |
EP (1) | EP1941479B1 (ja) |
JP (1) | JP5281894B2 (ja) |
KR (1) | KR101281992B1 (ja) |
CN (1) | CN101297336B (ja) |
AT (1) | ATE474303T1 (ja) |
DE (1) | DE602006015499D1 (ja) |
GB (1) | GB0521713D0 (ja) |
WO (1) | WO2007049004A1 (ja) |
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GB0103666D0 (en) * | 2001-02-15 | 2001-03-28 | Secr Defence | Road traffic monitoring system |
GB0103665D0 (en) | 2001-02-15 | 2001-03-28 | Secr Defence | Road traffic monitoring system |
CN1549224A (zh) * | 2003-05-13 | 2004-11-24 | 林贵生 | 车辆探测装置 |
GB2413629B (en) | 2004-04-30 | 2008-02-06 | Qinetiq Ltd | Cable for traffic control and monitoring |
-
2005
- 2005-10-25 GB GBGB0521713.8A patent/GB0521713D0/en not_active Ceased
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2006
- 2006-10-18 AT AT06794805T patent/ATE474303T1/de not_active IP Right Cessation
- 2006-10-18 EP EP06794805A patent/EP1941479B1/en active Active
- 2006-10-18 KR KR1020087012393A patent/KR101281992B1/ko active IP Right Grant
- 2006-10-18 CN CN2006800399570A patent/CN101297336B/zh active Active
- 2006-10-18 US US12/091,076 patent/US7652245B2/en active Active
- 2006-10-18 DE DE602006015499T patent/DE602006015499D1/de active Active
- 2006-10-18 JP JP2008537175A patent/JP5281894B2/ja active Active
- 2006-10-18 WO PCT/GB2006/003862 patent/WO2007049004A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
KR101281992B1 (ko) | 2013-07-04 |
KR20080059328A (ko) | 2008-06-26 |
US20080277568A1 (en) | 2008-11-13 |
DE602006015499D1 (de) | 2010-08-26 |
JP2009514081A (ja) | 2009-04-02 |
CN101297336A (zh) | 2008-10-29 |
US7652245B2 (en) | 2010-01-26 |
WO2007049004A8 (en) | 2008-06-05 |
ATE474303T1 (de) | 2010-07-15 |
EP1941479A1 (en) | 2008-07-09 |
WO2007049004A1 (en) | 2007-05-03 |
CN101297336B (zh) | 2010-06-09 |
GB0521713D0 (en) | 2005-11-30 |
EP1941479B1 (en) | 2010-07-14 |
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