Research and design of a calibration and verification system for tape measures and rulers with a measurement range of up to 30 metres

Abstract

To meet the demand for calibrating large-length measuring instruments, such as tape measures, rulers, and laser distance meters, in the construction, transportation, and industrial sectors, the research team has designed a calibration system with a measuring range of up to 30 metres using a laser interferometer derived from the primary length standard. Based on the research and analysis of standard systems currently in use at national metrology institutes around the world, the study proposes a system structure, operating principle, and design aligned with the technical, economic, and infrastructural conditions in Vietnam. Also, the system ensures feasibility, efficiency, and high applicability in practical use. The system includes a laser interferometer, a camera, mechanical components, and instruments for measuring environmental conditions and material temperature. This system ensures metrological traceability for large-length measuring instruments, including tape measures, line scales, and laser distance meters, while also meeting the growing practical demands of modern manufacturing and construction industries.