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This paper presents an efficient MEMS gyro aided automatic calibration algorithm for three-axis magnetic compass. This electronic compass module consists of a three-axis magnetic sensor, a two-axis inclinometer and a MEMS gyro. The magnetic electronic compass is used to determine the heading of a indoor mobile robot with respect to the magnetic North. The automatic calibration method requires the...
The design of magnetic electronic compass is introduced. Using Honeywell Anisotropic Magneto Resistance (ARM) sensor HMC1022, novel magnetic electronic compass has been developed. Despite rigorous testing has been done after produced, small resistance error still exists in, which result in bias voltage. Bias voltage amplified has a great influence on the measurement of geomagnetic field (weak magnetic...
The anisotropic magnetoresistive (AMR) sensors provide an excellent means of measuring both linear and angular position and displacement in the earth's magnetic field. The electrical output of these sensors is proportional to the magnetic field strength along its sensitive axis. When such a sensor is spun around a horizontal plane starting from magnetic north, the output is a cosine function of the...
Otologic drill is an important ear surgical instrument and used to mill temporal bone. The cotton which is used to stop bleeding may be entangled with the drill and whirl. The rotary cotton can damage the tissues, such as nerves and cochlea. An intelligent control device has been designed to help doctors to operate the drill and prevent the cotton from causing damage to human. The intelligent control...
The anisotropic magnetoresistive (AMR) sensor is one type that lends itself well to the earth's field sensing range. The key benefit of AMR sensors is they can be bulk manufactured on silicon wafers and mounted in commercial integrated circuit packages. But the sensitivity of AMR sensor changes greatly with the temperature of surrounding and cross-axis field. The sensitivity compensation method for...
Anisotropic magnetoresistive sensor can be used to measure DC and AC current by sensing the Held near the conductor in a contactless way. In order to improve measurement accuracy, an analysis of the influence of the displacement of the examined wire is made. According to the result of the analysis, restriction on the displacement of the examined wire is given. Current measurement method based on current...
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