Application of the Indoor Large-length Standard Device

The indoor large-length standard device is a comprehensive standard for traceability of large-length measurement value. It provides that the standard ensures its accuracy and reliability in the effective detection range. In order to ensure the accuracy of the quantity traceability of the large-length measuring instrument, we independently developed the domestic first set of metal linear guide indoor large-length standard device in the southwest. The high-precision metal linear guide cooperating with precision gear rack transmission is used in this device. The main drive system with an independent position closed-loop control is employed to eliminate effectively the influence of a series of problems, including the unstable floating track deformation and loss of friction wheels, difficult maintenance. The device can also hold an accurate and reliable statue throughout the execution, which can also maintain stable acceleration and velocity and has the advantages of no vibration transmission system, automatic operation. The measuring range of the device is (0∼56) m, and the uncertainty of measurement is U=0.14um+10⁻⁷L (k=2). Its function is mainly used to carry out the distance meter, laser interferometer, laser tracker, standard steel tape equipment, and terrestrial laser scanner; also the device can also be used for linear displacement sensors, liquid level measuring devices, standard baseline feet, and other non-standard class length equipment calibration. (paper)