公开(公告)号：CA2163045C

公开(公告)日：2003-08-05

申请号：CA2163045

申请日：1995-11-16

Applicant: INT ROAD DYNAMICS INC

Inventor： MOHAUPT UDO HORST

IPC: G01G7/06 ,  G01L1/14 ,  G01G7/00

Abstract: A capacitance transducer for use in measuring loads is provided herein. I t comprises a first electrode and a second electrode having overlapping surfac e areas spaced apart by a first solid or rigid dielectric and a second fluid dielectric. The first and second electrodes are so oriented that increasing force which is applied to the transducer resiliently presses an increasing portion of overlapping surface areas of the first and second electrodes into close proximity separated by the first dielectric while substantially removing the second dielectric from the areas of close proximity. This causes a capacitance response that depends significantly on the size of area s which are pressed together relative to any capacitance response resulting from a chang e in the spacing of the electrodes.

公开(公告)号：CA2343435A1

公开(公告)日：2002-10-06

申请号：CA2343435

申请日：2001-04-06

Applicant: INT ROAD DYNAMICS INC

Inventor： BERGAN TERRY ,  KLASHINSKY ROD

IPC: G08G1/081 ,  G08G1/095 ,  G08G1/08 ,  G08G1/09

Abstract: A novel dynamic work zone safety system and method of traffic control for a construction work zone are provided herein. The system includes a first traffic signalling device which is positioned along a roadside immediately upstream of a point where traffic is diverted to a single lane. The first traffic signalling device is defaulted to flash a suitable warning, e.g., "DO NOT PASS" or "MERGE LEFT" or "MERGE RIGHT", thereby to provide a first "NO PASSING" or "MERGE LEFT" or "MER GE RIGHT" zone which is defined by the distance between the first traffic signalling device and the end of the work or construction zone. A second traffic signalling device is positioned alongside a roadside a predetermined distance upstream of the fir st traffic signalling device. The second traffic signalling device defaulted not to fla sh a suitable warning, e. g., "DO NOT PASS" or "MERGE LEFT" or "MERGE RIGHT". However, when activated (by processor-controlled means defined herein) to flash a suitable warning, e.g., "DO NOT PASS" or "MERGE LEFT" or "MERGE RIGHT", the second traffic signalling device provides a second suitable zone, e.g., a "D O NOT PASS" or "MERGE LEFT" or "MERGE RIGHT" zone which is contiguous to the fir st "NO PASSING" or "MERGE LEFT" or "MERGE RIGHT" zone. This lengthens the "NO PASSING" or "MERGE LEFT" or "MERGE RIGHT" zone between the second traffic signalling device and the end of the work or construction zone. A plurality of spaced-apart sensors, preferably non-invasive sensors, is disposed along the roadway both downstream of, and upstream of, the second traffic signalling device. These sensors detect and determine the length of a traffic queue upstream of the first traffic signalling device between the first traffic signalling device and the second traffic signalling device, and provides a signal which is representative of the leng th of the traffic queue. The processor receives the traffic queue signal and generates a first activation signal to activate the second traffic signalling device when the traffic queue reaches a predetermined length. It also generates a first deactivation signa l to deactivate the second traffic signal when the traffic queue is less than the predetermined length. This dynamically increases or decreases the "NO PASSING" or "MERGE LEFT" or "MERGE RIGHT" zone.

公开(公告)号：CA2134718C

公开(公告)日：1998-06-09

申请号：CA2134718

申请日：1994-10-31

Applicant: INT ROAD DYNAMICS INC

Inventor： BERGAN TERRY

IPC: G08G1/01 ,  G08G1/02 ,  G08G1/056

Abstract: A bidirectional piezoelectric road traffic sensor is provided herein. It includes a first length of a coaxial piezoelectric cable having an electrically-conductive core, an electrically-conductive polymer surrounding the core, an electrically-conductive sheath therearound and an electrically non-conductive jacket around the sheath. A second length of a similar coaxial piezoelectric cable is provided. A first splice is formed in a particularly recited manner. This first splice is then encapsulated in an electrically non-conductive material, thereby providing a positive piezoelectric sensor. A third length of a similar coaxial piezoelectric cable is provided. A second splice is formed in a particularly recited manner. This second splice is then encapsulated in an electrically non-conductive material, thereby providing a neutral piezoelectric sensor, and a negative piezoelectric sensor. Preferably, a shielded coaxial cable including an electrically-conductive core, an electrically-conductive sheath and an electrically non-conductive jacket therearound is spliced by a third splice to the first piezoelectric cable in a particularly recited manner. The third splice is encapsulated in an electrically non-conductive material to provide a negative piezoelectric sensor.

公开(公告)号：CA2028660C

公开(公告)日：1996-08-13

申请号：CA2028660

申请日：1990-10-26

Applicant: INT ROAD DYNAMICS INC

Inventor： BERGAN TERRY ,  TAYLOR BRIAN

IPC: G01L1/22

Abstract: A novel load cell which is specially adapted for use in novel wheel load scales and novel weigh-in-motion scales is provided herein. The load cell comprises a metal rod or bar, with a strain transducer which is secured to a flattened portion of each of the upper and lower faces of the metal bar. A signal wire has its terminal secured to an end face of each of such strain transducer, and a strain relief element is interposed between each such signal wire terminal and its associated strain transducer. When mounted within a closed bore which is parallel to the upper surface of a flat plate of elastic material, e.g., sheet metal, in a particularly-recited manner, an improved wheel load scale or weigh-in-motion scale is provided. This provides a light weight, low profile, scale which is isolated from external interference, which thereby improves the accuracy of the scale.