PERFORMANCE CHARACTERISTICS OF AN ULTRASONIC DETECTOR FOR MEASUREMENTS OF VEHICLE OCCUPANCY
The article describes calibration performance tests carried out on a chekar usd-scp ultrasonic traffic detector used for the measurement of vehicle occupancies. The tests showed that errors in individual detector readings were several times greater than those predicted by theory based on the mode of operation of the detector and that, on average, some 6.5 per cent of vehicles were undetected during the observation periods. Whilst it is possible to correct for these factors in calibration, the random nature of these errors means that it is necessary to measure occupancies with a sample size of at least 50 vehicles if the overall error is not to exceed 10 per cent with 95 per cent confidence. (A) /TRRL/
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00410683
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Corporate Authors:
Printerhall Limited
29 Newmart Street
London W1P 3PE, England -
Authors:
- Ashworth, R
- Kentros, A
- Publication Date: 1976-12
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: p. 502-504
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Serial:
- Traffic Engineering & Control
- Volume: 17
- Issue Number: 12
- Publisher: Hemming Group, Limited
- ISSN: 0041-0683
- Serial URL: http://www.tecmagazine.com/
Subject/Index Terms
- TRT Terms: Calibration; Errors; Evaluation and assessment; Measurement; Measuring instruments; Numbers; Performance tests; Sensors; Ultrasonic tests; Ultrasonics; Vehicle detectors; Vehicle occupancy; Vehicle occupants
- ITRD Terms: 6155: Apparatus (measuring); 9020: Evaluation (assessment); 6136: Measurement; 6432: Number; 6120: Sensor; 6739: Ultrasonic; 1715: Vehicle occupant
- Subject Areas: Highways; Operations and Traffic Management; Passenger Transportation; Planning and Forecasting; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 00153308
- Record Type: Publication
- Source Agency: Transport and Road Research Laboratory (TRRL)
- Report/Paper Numbers: Analytic
- Files: ITRD, TRIS
- Created Date: Sep 20 1977 12:00AM