Abstract
Speed meters verification principles and problems are observed in the article. Method of vehicle average speed measurement over the specified length road segment was proposed, using four laser units. The method allows to avoid synchronization between measurements of speed meter under metrological test and reference system during verification procedure and therefore to avoid vehicle speed variation influence. Developed reference speed measurement system has expanded uncertainty less than ±0.3 km/h, including vehicle speed variation term. Ill. 3, bibl. 8 (in English; abstracts in English and Lithuanian).DOI: http://dx.doi.org/10.5755/j01.eee.119.3.1372
Highlights
Checking the speed of vehicles on the public road is used as main car accident preventive measure in all countries
The measurement error of all speed meter used today for traffic control in Lithuania is from 1 km/h to 3 km/h [5]
For example, operate measuring distance change over time and calculating the speed, they are tested by comparing the distance readings to the reference meter value, i.e. indirect method is used for verification
Summary
Checking the speed of vehicles on the public road is used as main car accident preventive measure in all countries. The first principle is based on speed meters testing by controlling other parameters (not the speed directly) that meter measures during operation and calculates the speed value. For example, operate measuring distance change over time and calculating the speed, they are tested by comparing the distance readings to the reference meter (tape-measure, laser distance meters, etc.) value, i.e. indirect method is used for verification. As the number of the stationary speed meters is growing, the goal to develop a mobile universal reference speed measurement system that could be used for validation and verification purposes, directly comparing speed meter under test measurement results to reference system measurement results in real time was set. Requirements to the reference system were the following: Measurement error ±0.3 km/h; Verification of the stationary speed meters in their installation place; Verification of the mobile, handheld speed meters; Speed meters field testing for type approval. The reference system structure, operation principle and measurement uncertainty is presented in following sections
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