Title:
【発明の名称】交通を分析するための方法および装置ならびにそのためのセンサ
Document Type and Number:
Japanese Patent JP2901958
Kind Code:
B2
Abstract:
A detector for detecting a characteristic and a speed of a vehicle includes a first magnetic field sensor. The first magnetic field sensor includes a magnetically variable resistor that changes resistance in response to being exposed to a magnetic field. A bias is applied to the magnetically variable resistor and a change in the resistance thereof in response to an applied magnetic field is detected by an amplifier. The amplifier generates a first analog signal indicative of changes in the resistance of the magnetically variable resistor. A differentiating circuit differentiates the first analog signal and produces a first output that changes binary state in response to detecting a predetermined change in the differentiated first analog signal. A counter accumulates values at a predetermined rate and a microprocessor stores values of the counter corresponding to each change in the binary state of the first output of the differentiating circuit. The microprocessor converts the stored counter values into a first time series profile corresponding to changes in the first output of the differentiating circuit and accumulates and stores a count of a characteristic of the passing vehicle based on the first time series profile. A second time series profile is produced from counter values accumulated in response to the differentiating circuit producing a second output.
Inventors:
HAARII AARU SANPEI
Application Number:
JP11256298A
Publication Date:
June 07, 1999
Filing Date:
April 22, 1998
Export Citation:
Assignee:
NYUU METORITSUKUSU INC
International Classes:
G01P5/18; G01R33/09; G01V3/08; G06M7/00; G08G1/042; (IPC1-7): G01V3/08; G01P5/18; G01R33/09; G06M7/00; G08G1/042
Attorney, Agent or Firm:
Shunichiro Suzuki