GB1573188A - Measuring systems - Google Patents

Measuring systems Download PDF

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Publication number
GB1573188A
GB1573188A GB39730/77A GB3973077A GB1573188A GB 1573188 A GB1573188 A GB 1573188A GB 39730/77 A GB39730/77 A GB 39730/77A GB 3973077 A GB3973077 A GB 3973077A GB 1573188 A GB1573188 A GB 1573188A
Authority
GB
United Kingdom
Prior art keywords
vehicle
detector
radiation
detectors
measuring system
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
GB39730/77A
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.)
British Railways Board
Original Assignee
British Railways Board
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 British Railways Board filed Critical British Railways Board
Priority to GB39730/77A priority Critical patent/GB1573188A/en
Priority to IE1748/78A priority patent/IE47432B1/en
Priority to NL7808941A priority patent/NL7808941A/en
Priority to SE7809235A priority patent/SE7809235L/en
Priority to DE19782838583 priority patent/DE2838583A1/en
Priority to FI782758A priority patent/FI782758A/en
Priority to FR7826702A priority patent/FR2404197A1/en
Priority to ES473597A priority patent/ES473597A1/en
Priority to BE190644A priority patent/BE870681A/en
Priority to NO783226A priority patent/NO783226L/en
Priority to DK422878A priority patent/DK422878A/en
Priority to IT28021/78A priority patent/IT1098909B/en
Publication of GB1573188A publication Critical patent/GB1573188A/en
Expired legal-status Critical Current

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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
    • G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
    • 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
    • G08G1/015—Detecting movement of traffic to be counted or controlled with provision for distinguishing between two or more types of vehicles, e.g. between motor-cars and cycles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Traffic Control Systems (AREA)
  • Length-Measuring Devices Using Wave Or Particle Radiation (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Description

(54) IMPROVEMENT RELATING TO MEASURING SYSTEMS (71) We, BRITISH RAILWAYS BOARD, a public authority established under the provisions of the Transport Act 1962, of 222 Marylebone Road, London, N.W.1., do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to measuring systems and has particular, but not exclusive, application to the measurement of the length of moving vehicles.
In the transportation of commercial road vehicles by sea ferries, the tariff charged is based, inter alia, on vehicle length. The tariff is normally expressed as a charge per metre with a gradation down to 0.1 metre which is charged proportionally. At the present time the declared lengths of vehicles are checked on a random basis to discourage under-declarations of length.
This checking is carried out by inspectors using tape-measures or the like and has to be carried out while the vehicles are stationary; it is therefore time-consuming and labour intensive.
The main object of the present invention is to provide a measuring system which enables the length of a vehicle to be measured automatically while the vehicle is moving.
Accordingly the present invention provides a measuring system comprising: (a) a pair of detector stations spaced a predetermined distance apart along a path of movement for a vehicle, each detector station comprising a vertically extending series of electromagnetic radiation emitters disposed on one side of said path, each emitter producing a directional beam of radiation, and at least one electromagnetic radiation detector which is designed to produce an electrical output signal related to the quantity or intensity of radiation incident upon it, said detector being disposed on the other side of said path and said emitters or a group of said emitters being arranged to direct their beams at it, whereby the said quantity or intensity of incident electromagnetic radiation registered by said detector is dependent upon the number of said beams intercepted by a passing vehicle, and (b) data processing means for processing the output signals from said detectors on a time basis and utilising the known predetermined spacing of said detector stations to provide a velocity related vehicle measurement.
Said electromagnetic radiation is advantageously infra-red radiation.
Thus the measuring system of the invention can be used to measure vehicle length and/or vehicle velocity.
As will be explained the measurement of vehicle length is a function of vehicle velocity, which in turn is a function of the time taken for an identifiable point on the vehicle to cover the known distance between the two detector stations. With the above defined emitter and detector arrangements at the two detector stations, a vehicle as it passes each detector station will produce on the detector a radiation intensity or quantity pattern determined by the number of said radiation beams which are interrupted by each cross-section of the vehicle passing through that station. From these patterns certain characteristic points along the vehicle are readily identifiable. Hence a measurement of the time taken for a number of identifiable points to move between the two stations can be made and an average transit time arrived at, which will compensate within limits for variation in vehicle velocity as it is moving between the two stations.
One of the characteristic points which is identifiable by pattern recognition are vehicle axles. The system can therefore additionally be used to count the number of vehicle axles, and this in combination with a weight measurement can provide information regarding axle loading.
The measuring system of the present invention can readily be incorporated into a comprehensive vehicle data system. Thus the measuring system can be installed adjacent a dynamic weighbridge system and the information provided by the two systems can be fed to a data base where it is combined with other relevant vehicle data, to provide a composite read-out of all this data.
One embodiment of the measuring system of the invention as applied to vehicle length measurement will now be described by way of example with reference to the accompanying diagrammatic drawings, in which: Figure 1 shows the measuring system in association with a dynamic weighbridge, Figure 2 shows a view of one of the detector stations as seen by the vehicle moving along its path of travel, Figure 3 shows a block circuit diagram of the data processing means for processing the output signals from the detector stations, Figure 4 shows radiation intensity or quantity patterns on a time base as a vehicle moves past the detector stations, and Figure 5 shows a view similar to Figure 2 of a modified detector station.
Referring to the drawings, the measuring system comprises two detector stations 1 and 2, which in effect form gateways at either end of a dynamic weighbridge 3 so that a vehicle 4 passing over the weighbridge 3 also passes through the two detector stations 1 and 2. As will be described the two detector stations 1 and 2 provide electrical outputs to data processing means 5 which provides as its output a signal representative of overall vehicle length.
This output together with an output from the weighbridge data unit 6 representative of gross vehicle weight is fed to a data base 7 in a freight office and from which a printout of these items of information together with other vehicle data can be obtained.
The data base may have provision for feeding its information to a central computer.
The detector stations 1 and 2 are spaced a predetermined distance apart (e.g. 2 metres). Each station comprises a pair of posts 8 and 9 disposed on opposite sides of the path of vehicle travel. The posts 8 each carry a vertical series of infra-red radiation emitting diodes 10 spaced for example 0.2 metres apart and each producing a constant radiation intensity output. Each of the diodes 10 incorporates a lens system so that it produces a conically diverging beam of infra-red radiation, the cone angle being for example 10 . The posts 9 each carry a single infra-red detector diode 11, whose vertical position on the post 9 is adjustable for convenience in setting up the system. The diodes 10 are oriented so that their optical axes are directed at the detector diode 11 of tha associated detector station. Thus a triangular curtain of infra-red radiation extends across the path of vehicle travel at each station as shown in Figures 1 and 2.
Each of the detector diodes 11 produces an electrical output representative of the intensity or quantity of the infra-red radiation incident upon it so that as long as any part of a vehicle is interrupting one of the radiation curtains the output from the associated diode 11 will be a "less than maximum intensity or quantity" signal. If therefore the data processing means fundamentally has the facility for measuring the time taken for output signals from each of the detectors 11 to move from "maximum intensity or quantity" back to "maximum intensity or quantity" through a continuous range of "less than maximum intensity or quantity", the length of a vehicle can be measured using the following two equations: L(t1 R=tl F)V (1) D V= (2) (t2F t1F) from which two equations: (t1Rt1F). D (3) (t2F t1 where t1, is the time in absolute terms at which the front of the vehicle interrupts the detector station 1, t2F is the time at which the front of the vehicle interrupts the detector station 2, t1R is the time at which the rear of the vehicle clears the detector station 1, t2R is the time at which the rear of the vehicle clears the detector station 2, L is the length of the vehicle, V is the velocity of the vehicle, D is the distance between the detector stations.
It will be appreciated from equation (3) that there is no need for an indication of vehicle velocity to be given. However a constant vehicle velocity has been assumed and this fact could introduce unacceptable errors into the length measurement if in fact the vehicle velocity does vary as it passes between the two detector stations 1 and 2.
As will now be described the measuring system has an inbuilt facility for determining, in effect an average vehicle velocity of transit so that, within limits changes in vehicle velocity of transit are compensated for in the length measurement.
As a vehicle passes through each of the radiation curtains each cross-section of the vehicle will interrupt a certain number of infra-red beams so that on a time base a radiation intensity or quantity pattern will be produced on the associated detector diode 11 and this will be reflected in the output from the detector diode. Such intensity or quantity patterns from the two detector stations are shown superimposed in Figure 4. Using pattern recognition techniques therefore certain features of the vehicle can be recognised, for example as annotated on Figure 4 where the front of the vehicle cab 100, the cab body 101, the wheels 102, 104 and 105 and the trailer body 103 are indicated. Hence a number of velocity measurements can be made for different points along the vehicle length and an average velocity derived for use in equation (3). Thus the general equation for vehicle velocity corresponding to equation (2) is D (4) (t2xtix) Where tix is the time in absolute terms at which a given point in the length of the vehicle interrupts the detector station 1 and t2x is the time at which said given point interrupts detector station 2.
Figure 3 shows a block diagram of the data processing means 5 in which the outputs of the two detector diodes 11 are fed to an interface unit 12 which includes an analogue-to-digital converter for converting the analogue output signals from the diodes 11 to equivalent digital values. Under the control of the micro-computer 13-either of these digital values can be fed into the micro-computer store. The operator's console 14 has a keyboard and display which enable the operator to initiate the measuring process, to select which measurements are required (e.g. "length", "number of axles"), and to supply data such as the vehicle registration. With this information, the micro-computer receives and stores the sequence of radiation intensity or quantity values from the detectors 11, computes the desired measurements using the quoted equations and causes these measurements to be printed by the printer on the operator's console 14, and transmitted to the Freight Office data base 7.
With the length measurement system described above a narrow band optical filter is advantageously placed in front of each of the detector diodes 11 to block radiation other than that in the infra-red zone of the spectrum. Any problems with reflected light can be overcome by time modulating the output of the radiation emitting diodes at a fixed frequency and tuning the detectors to this frequency. Such modulation can conveniently be achieved by switching a d.c.
supply to one station's light-emitting diodes for alternate half cycles of said predetermined frequency and to the second station's light-emitting diodes for the other half cycles.
In the above described system a single detector 11 is used at each detector station.
In a modification two or more detectors may be used, a respective group of the infrared emitting diodes 10 having their optical axes directed at each of the detectors.
Figure 5 shows one such arrangement in which two detectors referenced 111 and 1111 are used, one at the same level as in Figure 2 and the other at a relatively low level. The upper group of diodes referenced 101 have their optical axes directed at the detector 11' and the lower group of diodes referenced 10" have their optical axes directed at the detector 1111.
The quantity of radiation falling on the two detectors 11' and 11" is summed and produces a pattern for the vehicle similar to that shown in Figure 4. The advantage of having a plural detector arrangement as shown in Figure 5, is that it enables recognition of the lower part of the vehicle more accurately and thus for example provides a more reliable axle count arrangement. In fact the detector 1111 and its associated group of electrodes 10 could be used alone for axle counting.
WHAT WE CLAIM IS: 1. A measuring system comprising: (a) a pair of detector stations spaced a predetermined distance apart along a path of movement for a vehicle, each detector station comprising a vertically extending series of electromagnetic radiation emitters disposed on one side of said path, each emitter producing a directional beam of radiation, and at least one electromagnetic radiation detector which is designed to produce atn electrical output signal related to the quantity or intensity of radiation incident upon it, said detector being disposed on the other side of said path and said emitters or a group of said emitters being arranged to direct their beams at it, whereby the said quantity or intensity of incident electromagnetic radiation registered by said detector is dependent upon the number of said beams intercepted by a passing vehicle, and (b) data processing means for processing the output signals from said detectors on a
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    velocity of transit so that, within limits changes in vehicle velocity of transit are compensated for in the length measurement.
    As a vehicle passes through each of the radiation curtains each cross-section of the vehicle will interrupt a certain number of infra-red beams so that on a time base a radiation intensity or quantity pattern will be produced on the associated detector diode 11 and this will be reflected in the output from the detector diode. Such intensity or quantity patterns from the two detector stations are shown superimposed in Figure 4. Using pattern recognition techniques therefore certain features of the vehicle can be recognised, for example as annotated on Figure 4 where the front of the vehicle cab 100, the cab body 101, the wheels 102, 104 and 105 and the trailer body
    103 are indicated. Hence a number of velocity measurements can be made for different points along the vehicle length and an average velocity derived for use in equation (3). Thus the general equation for vehicle velocity corresponding to equation (2) is D (4) (t2xtix) Where tix is the time in absolute terms at which a given point in the length of the vehicle interrupts the detector station 1 and t2x is the time at which said given point interrupts detector station 2.
    Figure 3 shows a block diagram of the data processing means 5 in which the outputs of the two detector diodes 11 are fed to an interface unit 12 which includes an analogue-to-digital converter for converting the analogue output signals from the diodes 11 to equivalent digital values. Under the control of the micro-computer 13-either of these digital values can be fed into the micro-computer store. The operator's console 14 has a keyboard and display which enable the operator to initiate the measuring process, to select which measurements are required (e.g. "length", "number of axles"), and to supply data such as the vehicle registration. With this information, the micro-computer receives and stores the sequence of radiation intensity or quantity values from the detectors 11, computes the desired measurements using the quoted equations and causes these measurements to be printed by the printer on the operator's console 14, and transmitted to the Freight Office data base 7.
    With the length measurement system described above a narrow band optical filter is advantageously placed in front of each of the detector diodes 11 to block radiation other than that in the infra-red zone of the spectrum. Any problems with reflected light can be overcome by time modulating the output of the radiation emitting diodes at a fixed frequency and tuning the detectors to this frequency. Such modulation can conveniently be achieved by switching a d.c.
    supply to one station's light-emitting diodes for alternate half cycles of said predetermined frequency and to the second station's light-emitting diodes for the other half cycles.
    In the above described system a single detector 11 is used at each detector station.
    In a modification two or more detectors may be used, a respective group of the infrared emitting diodes 10 having their optical axes directed at each of the detectors.
    Figure 5 shows one such arrangement in which two detectors referenced 111 and 1111 are used, one at the same level as in Figure 2 and the other at a relatively low level. The upper group of diodes referenced 101 have their optical axes directed at the detector 11' and the lower group of diodes referenced 10" have their optical axes directed at the detector 1111.
    The quantity of radiation falling on the two detectors 11' and 11" is summed and produces a pattern for the vehicle similar to that shown in Figure 4. The advantage of having a plural detector arrangement as shown in Figure 5, is that it enables recognition of the lower part of the vehicle more accurately and thus for example provides a more reliable axle count arrangement. In fact the detector 1111 and its associated group of electrodes 10 could be used alone for axle counting.
    WHAT WE CLAIM IS: 1. A measuring system comprising: (a) a pair of detector stations spaced a predetermined distance apart along a path of movement for a vehicle, each detector station comprising a vertically extending series of electromagnetic radiation emitters disposed on one side of said path, each emitter producing a directional beam of radiation, and at least one electromagnetic radiation detector which is designed to produce atn electrical output signal related to the quantity or intensity of radiation incident upon it, said detector being disposed on the other side of said path and said emitters or a group of said emitters being arranged to direct their beams at it, whereby the said quantity or intensity of incident electromagnetic radiation registered by said detector is dependent upon the number of said beams intercepted by a passing vehicle, and (b) data processing means for processing the output signals from said detectors on a
    time basis and utilising the known predetermined spacing of said detector stations to provide a velocity related vehicle measurement.
  2. 2. A measuring system according to claim 1 wherein each emitter produces a directional beam of infra-red radiation.
  3. 3. A measuring system according to claim 1 or 2, wherein each emitter produces a conically diverging beam of electromagnetic radiation, the cone angle being about 10 .
  4. 4. A measuring system according to any preceding claim, wherein each detector station has a plurality of vertically spaced electromagnetic radiation detectors and the electromagnetic radiation emitters are divided into a number of groups equal to the number of detectors, the emitters of each said group being arranged to direct their beams of radiation at a respective detector.
  5. 5. A measuring system according to any preceding claim wherein said data processing means calculates vehicle length using the time taken for the vehicle to pass one of said detector stations and the vehicle velocity as calculated by the time taken for a given point on the vehicle to move the predetermined distance between said two detector stations.
  6. 6. A measuring system according to claim 5, wherein a vehicle velocity for each of a plurality of points on said vehicle is derived and an average of the derived vehicle velocities used in the calculation of vehicle length.
  7. 7. A measuring system according to claim 6, wherein said given points are recognised by the characteristic radiation quantity or intensity-which they cause to be registered on said detectors.
  8. 8. A measuring system substantially as hereinbefore described with reference to the accompanying drawings.
GB39730/77A 1977-09-23 1977-09-23 Measuring systems Expired GB1573188A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
GB39730/77A GB1573188A (en) 1977-09-23 1977-09-23 Measuring systems
IE1748/78A IE47432B1 (en) 1977-09-23 1978-08-29 Improvements relating to measuring systems
NL7808941A NL7808941A (en) 1977-09-23 1978-08-31 MEASURING DEVICE.
SE7809235A SE7809235L (en) 1977-09-23 1978-09-01 METSYSTEM, SPECIAL FOR SATURATION OF THE LENGTH OF VEHICLES IN MOVEMENT
DE19782838583 DE2838583A1 (en) 1977-09-23 1978-09-05 MEASURING SYSTEM FOR MEASURING THE LENGTH OF VEHICLES IN MOVING
FI782758A FI782758A (en) 1977-09-23 1978-09-08 FOERBAETTRINGAR I MAETSYSTEM
FR7826702A FR2404197A1 (en) 1977-09-23 1978-09-18 LENGTH MEASUREMENT SYSTEM FOR MOVING VEHICLES
ES473597A ES473597A1 (en) 1977-09-23 1978-09-22 Measuring systems
BE190644A BE870681A (en) 1977-09-23 1978-09-22 SYSTEM FOR MEASURING THE LENGTH OF A MOVING VEHICLE
NO783226A NO783226L (en) 1977-09-23 1978-09-22 MEASUREMENT SYSTEM.
DK422878A DK422878A (en) 1977-09-23 1978-09-22 FACILITIES TO MAKE MEASUREMENTS OF DRIVING VEHICLES
IT28021/78A IT1098909B (en) 1977-09-23 1978-09-25 SYSTEM FOR MEASURING THE LENGTH OF A MOVING VEHICLE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB39730/77A GB1573188A (en) 1977-09-23 1977-09-23 Measuring systems

Publications (1)

Publication Number Publication Date
GB1573188A true GB1573188A (en) 1980-08-20

Family

ID=10411157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39730/77A Expired GB1573188A (en) 1977-09-23 1977-09-23 Measuring systems

Country Status (12)

Country Link
BE (1) BE870681A (en)
DE (1) DE2838583A1 (en)
DK (1) DK422878A (en)
ES (1) ES473597A1 (en)
FI (1) FI782758A (en)
FR (1) FR2404197A1 (en)
GB (1) GB1573188A (en)
IE (1) IE47432B1 (en)
IT (1) IT1098909B (en)
NL (1) NL7808941A (en)
NO (1) NO783226L (en)
SE (1) SE7809235L (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006474A1 (en) * 1985-04-25 1986-11-06 TH STRA^oLFORS AB Arrangement and method for measurement of articles
GB2183889A (en) * 1985-10-07 1987-06-10 Hagai Sigalov Producing control signals
GB2185105A (en) * 1986-01-07 1987-07-08 Bicc Plc Velocity measurement
GB2211603A (en) * 1987-10-27 1989-07-05 Stewart Hughes Ltd Blade incidence tracking apparatus
FR2646709A1 (en) * 1989-05-03 1990-11-09 Serco Ltd METHOD FOR DETERMINING THE LENGTH OF A VEHICLE WHILE MOVING AND APPARATUS FOR IMPLEMENTING SAME
GB2258041A (en) * 1991-07-20 1993-01-27 Longdin & Browning Dimensional measurement system
WO1993019429A1 (en) * 1992-03-18 1993-09-30 In-Mar-Tech Australia Pty. Ltd. Vision apparatus

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1192491B (en) * 1982-08-10 1988-04-13 Fiorello Sodi AUTOMATIC EQUIPMENT FOR SPEED CONTROL OF VEHICLES IN TRANSIT, WITH SELECTION VEHICLES, IN PARTICULAR FOR DISCRIMINATION BETWEEN HEAVY VEHICLES AND VEHICLES
DE3432355A1 (en) * 1984-09-03 1986-03-13 Siemens AG, 1000 Berlin und 8000 München Device for determining the wheel diameter of railway carriages
FR2670404B1 (en) * 1990-12-12 1995-05-12 Dassault Electronique DEVICE AND METHOD FOR AUTOMATIC CLASSIFICATION OF HANDHELD VEHICLES.
DE4311991A1 (en) * 1993-04-06 1994-10-13 Refit Ev Method and arrangement for determining traffic variables
DE19717661A1 (en) * 1997-04-25 1998-10-29 Krupp Foerdertechnik Gmbh Continuous identification method of essential characteristics of rail vehicle
FR3078810B1 (en) * 2018-03-08 2020-04-03 Idemia Identity And Security DEVICE AND METHOD FOR DIFFERENTIATING A HEAVY WEIGHT FOR TRANSPORTING GOODS FROM A COACH

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB960922A (en) * 1961-11-14 1964-06-17 British Iron Steel Research Improvements in and relating to measuring apparatus
FR2088131A1 (en) * 1970-05-21 1972-01-07 Subra Jacques
BE790341A (en) * 1971-10-29 1973-04-20 Siderurgie Fse Inst Rech
US3872283A (en) * 1973-07-13 1975-03-18 Cadre Corp Vehicle identification method and apparatus
IT1044402B (en) * 1975-06-19 1980-03-20 Autostrade Concess Const SCANNING BARRIER FOR THE DISCRIMINATION AND COUNTING OF OBJECTS AND MORE SPECIFICALLY OF VEHICLES IN TRANSIT THROUGH A LAMINAR BARRIER OF ELECTROMAGNETIC MICROWAVES

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986006474A1 (en) * 1985-04-25 1986-11-06 TH STRA^oLFORS AB Arrangement and method for measurement of articles
GB2183889A (en) * 1985-10-07 1987-06-10 Hagai Sigalov Producing control signals
GB2183889B (en) * 1985-10-07 1989-09-13 Hagai Sigalov Optical control means
GB2185105A (en) * 1986-01-07 1987-07-08 Bicc Plc Velocity measurement
GB2211603A (en) * 1987-10-27 1989-07-05 Stewart Hughes Ltd Blade incidence tracking apparatus
FR2646709A1 (en) * 1989-05-03 1990-11-09 Serco Ltd METHOD FOR DETERMINING THE LENGTH OF A VEHICLE WHILE MOVING AND APPARATUS FOR IMPLEMENTING SAME
GB2231952A (en) * 1989-05-03 1990-11-28 Serco Limited Vehicle length measurement system
GB2258041A (en) * 1991-07-20 1993-01-27 Longdin & Browning Dimensional measurement system
WO1993019429A1 (en) * 1992-03-18 1993-09-30 In-Mar-Tech Australia Pty. Ltd. Vision apparatus

Also Published As

Publication number Publication date
NL7808941A (en) 1979-03-27
IE781748L (en) 1979-03-23
FR2404197B1 (en) 1982-02-19
IT1098909B (en) 1985-09-18
FI782758A (en) 1979-03-24
ES473597A1 (en) 1979-04-16
FR2404197A1 (en) 1979-04-20
SE7809235L (en) 1979-03-24
DK422878A (en) 1979-03-24
IE47432B1 (en) 1984-03-21
NO783226L (en) 1979-03-26
BE870681A (en) 1979-01-15
IT7828021A0 (en) 1978-09-25
DE2838583A1 (en) 1979-04-05

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Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19980525