Self-calibration method for rotating laser positioning system using interscanning technology and ultrasonic ranging.

Area of Science:

• Metrology
• Optical Measurement Systems
• Geomatics

Background:

• Rotating Laser Positioning Systems (RLPS) are crucial for large-scale metrology.
• Traditional calibration of RLPS transmitter stations is complex and inefficient, requiring auxiliary devices like laser trackers.
• Accurate spatial relationship determination between stations is essential for measurement network integrity.

Purpose of the Study:

• To develop an automated self-calibration method for RLPS.
• To improve the efficiency and accuracy of determining the positional relationships between RLPS transmitter stations.
• To reduce reliance on external calibration equipment and complex procedures.

Main Methods:

• Implementation of interscanning technology using a calibration bar equipped with RLPS receivers and an ultrasonic sensor.
• Development of a calibration algorithm based on multiplane and distance constraints.
• Mathematical modeling using a two-station system to detail the calibration process.

Main Results:

• Achieved coordinate measurement uncertainty of spatial points at approximately 0.1 mm.
• Demonstrated an average coordinate measurement deviation of about 0.3 mm compared to a laser tracker.
• Significantly improved calibration efficiency compared to traditional methods.

Conclusions:

• The proposed self-calibration method for RLPS is accurate and efficient for large-scale metrology.
• The achieved accuracy meets the requirements for most practical applications.
• This method offers a substantial improvement in calibration speed and reduces operational complexity.