GB832330A - Improvements in or relating to traffic analyzers for recording the velocity of vehicles on a roadway or the like - Google Patents

Improvements in or relating to traffic analyzers for recording the velocity of vehicles on a roadway or the like

Info

Publication number
GB832330A
GB832330A GB30220/58A GB3022058A GB832330A GB 832330 A GB832330 A GB 832330A GB 30220/58 A GB30220/58 A GB 30220/58A GB 3022058 A GB3022058 A GB 3022058A GB 832330 A GB832330 A GB 832330A
Authority
GB
United Kingdom
Prior art keywords
road
wire
electronic relay
stretched
vehicles
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.)
Expired
Application number
GB30220/58A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB832330A publication Critical patent/GB832330A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
    • G01P3/66—Devices characterised by the determination of the time taken to traverse a fixed distance using electric or magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Abstract

832,330. Electrical measuring systems; signalling passage of vehicles. TELEFONAKTIEBOLAGET L. M. ERICSSON. Sept. 22, 1958 [Sept. 23, 1957], No. 30220/58. Classes 40 (1) and 118 (2). [Also in Groups XXXVI and XL (c)] Apparatus for determining the speed of vehicles comprises two microphones, each attached to a wire stretched across a road and feeding an electronic relay which is actuated when the output from the appropriate microphone exceeds a predetermined value and means for determining and recording the interval between the times of operation of each relay. As shown, each microphone M is fitted into a cylindrical holder 26 soldered to a bar 23. The ends of the bar 23 protrude via rubber grommets 24 from a housing 22. Wires T1, T2 are stretched across a road V, the left-hand end of each wire being anchored to one side of the road and the right-hand end to a hook 25. Springs (not shown) are stretched between lugs 27 and the right-hand side of the road. When the front wheels of a vehicle pass over wire T1 a signal is generated by microphone G1 and fed via an amplifier F1 and rectifier K1 to trigger an electronic relay S1 which starts a timer R. When the front wheels pass over the second wire T2 the second electronic relay S2 is similarly operated to stop the timer R. Alternative timers specified comprise means for counting the cycles of a crystal controlled oscillator or a constant speed drum providing a punched card or tape output. The electronic relay S may use a thyratron as in Fig. 3 (not shown), or a transistor bi-stable circuit as. in Fig. 4 (see Group XL (c)).
GB30220/58A 1957-09-23 1958-09-22 Improvements in or relating to traffic analyzers for recording the velocity of vehicles on a roadway or the like Expired GB832330A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE832330X 1957-09-23

Publications (1)

Publication Number Publication Date
GB832330A true GB832330A (en) 1960-04-06

Family

ID=20353967

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30220/58A Expired GB832330A (en) 1957-09-23 1958-09-22 Improvements in or relating to traffic analyzers for recording the velocity of vehicles on a roadway or the like

Country Status (3)

Country Link
DE (1) DE1086926B (en)
FR (1) FR1202720A (en)
GB (1) GB832330A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573724A (en) * 1966-07-15 1971-04-06 Matsushita Electric Ind Co Ltd Traffic flow detecting apparatus
GB1372724A (en) * 1971-02-05 1974-11-06 Ici Ltd Detection of velocities of fluids in conduits
DE3002434A1 (en) * 1980-01-24 1981-07-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Road vehicle speed determination system - using directional microphones to measure frequency shift between two points

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2400489A (en) * 1942-06-19 1946-05-21 State College Of Washington Re Photoelectric counter and speed measuring device
US2713679A (en) * 1954-04-15 1955-07-19 Ewertz Clement George Sonic speed recorder

Also Published As

Publication number Publication date
FR1202720A (en) 1960-01-12
DE1086926B (en) 1960-08-11

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