Dimensional Measurement Laboratory



The Dimensional Measurement Laboratory (DML) provides traceability of dimensional standards and calibration services for domestic industry. A variety of measurement systems were established and categorized as end standards, scales, angles, topography, thickness and so forth. The provided calibration services include stabilized laser frequency, long and short gauge blocks, ring gauges, plug gauges, line scales, polygons, index tables, roundness, roughness, step height, standard tapes, theodolites, electronic distance measuring instruments, interferometers, gratings, line width, , GPS receivers, etc. In addition to the developments of calibration systems, the DML also devotes into advanced dimensional metrology research such as optical frequency standard of femtosecond laser, and geodetic measurement standards.

With regard to temperature standards, the triple point of water cell and the metal freezing point cells have been produced to develop temperature measurement standard which conforms to the international temperature scale.

For humidity standards, a two-pressure humidity generator standard have been built up in the Laboratory.

Calibration and Measurement Capabilities, CMCs

Since 2004, the calibration and measurement capabilities (CMCs) in the area of length (L) have been incorporated in BIPM’s key comparison database (KCDB.) It declares the best measurement capabilities for calibration services.


Technical Services

  • Dimensional,measurement/calibration service
  • Temperature measurement/calibration service
  • Humidity measurement/calibration service
  • Related measurement technique consulting service
  • Development of femtosecond laser for optical frequency
  • Inspection for high precision stage
  • Customized service for the AOI image or step-height standards
  • Geodetic positions and geographical information system (GIS) application

Research Projects

  • Femtosecond laser for optical frequency metrology
  • Calibration technology for absolute and relative gravimeters
  • Fundamental study in new international temperature scale
  • Measurements technology and Standards for Thermoelectric Materials

E200 1 S        塊規干涉校正系統  

          Iodined Laser Calibration System         Gauge Blocks Calibration System -Gauge Block Interferometer