50 m LINEAR MEASURING INTERFEROMETER FOR CALIBRATION OF SURVEY TAPE

摘要

Laser interferometric measurement system for calibration of tape up to 50 m had been constructed and was recently modified for automatic measurement. It consists of a precision laser interferometer, a guide rail, a moving carriage, and optical microscope with CCD camera and an image processor. The calibration of the tape is generally carried out by a comparison measurement as well as an absolute measurement traceable to SI unit of length. The system can be adapted to several other tasks. For example, ultrasonic distance meter and electronic distance can be calibrated in this system.