Title :
Magnetic inclination measurement and signal transmission system for trench wall constructions
Author :
Vorlicek, Karl ; Hauser, Hans ; Franz, Manuela
Author_Institution :
Inst. fur Werkstoffe der Elektrotechnik, Tech. Univ. Wien, Austria
fDate :
11/1/1994 12:00:00 AM
Abstract :
A NdFeB permanent magnet pendulum varies the output voltage of a semiconductor Hall-effect potentiometer. The angle dependent dc-voltage is converted into a signal of variable frequency (2-15 kHz). The angle sensors, the electronic circuits, and batteries are mounted in water-proof (20 bar) and shock protected (100 g) cases on the gripper. It is operated by two steel cables which are used for the signal transmission by enclosing ring-core transformers of high initial permeability. The received angular information is decoded by a microprocessor and displayed together with the excavation depth on a screen in the operation cabin of the excavator. The measurement system provides an angular resolution of 5.10-3 degrees and an absolute accuracy of 7.10-3 degrees at ±2 degrees total range
Keywords :
Hall effect transducers; angular measurement; boron alloys; iron alloys; magnetic sensors; neodymium alloys; permanent magnets; 2 to 15 kHz; 20 bar; NdFeB; NdFeB permanent magnet pendulum; angle dependent dc-voltage; angle sensors; angular resolution; excavator; magnetic inclination measurement; microprocessor; operation cabin; ring-core transformers; semiconductor Hall-effect potentiometer; shock protected cases; signal transmission; steel cables; trench wall constructions; water-proof cases; Battery charge measurement; Electric shock; Electronic circuits; Frequency conversion; Magnetic semiconductors; Magnetic sensors; Permanent magnets; Potentiometers; Protection; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
