A robot-arm positioning control is described. It makes use of a microprocessor-based ultrasonic system and of a novel time-of-flight measurement technique. The experimental system consists of a three aligned ultrasonic transducers mounted on a rod. Two transducers work as receivers, while the third works both as a transmitter and a receiver. The system achieves a positioning accuracy of +or-0.1 degrees in the field of +or-10 degrees of misalignment for a distance ranging from a few centimeters up to 200 mm. For a higher distance range up to 300 mm, the position accuracy is +or-0.4 degrees . The system also performs distance measurement, using the same group of transducers. The system can be used in robotic applications in industrial environments, such as for orientation control or object grasping. >
[1]
J. S. Schoenwald,et al.
Strategies for Robotic Sensing Using Acoustics
,
1985,
IEEE 1985 Ultrasonics Symposium.
[2]
A. Taroni,et al.
A Temperature Compensated Ultrasonic Sensor Operating in Air for Distance and Proximity Measurements
,
1982,
IEEE Transactions on Industrial Electronics.
[3]
V. Magori,et al.
Ultrasonic remote sensors for noncontact object detection
,
1981
.
[4]
A. Weyns,et al.
Radiation-field Calculations of Pulsed Ultrasonic Transducers .1. Planar Circular, Square and Annular Transducers
,
1980
.
[5]
S. Marin,et al.
The use of ultrasonics for gauging and proximity sensing in air
,
1986
.