NDLI: A solid state tilt meter for current meter attitude determination

Content Provider	IEEE Xplore Digital Library
Author	Williams, A.J.
Copyright Year	2004
Description	Author affiliation: Appl. Ocean Phys. & Eng., Woods Hole Oceanogr. Instn., MA (Williams, A.J.)
Abstract	Earth coordinate determination of current requires measurement of heading and tilt of the sensor to rotate the instrument frame measurement of velocity into Earth frame coordinates. Gimbaled magnetometer coils allow the magnetic heading to be determined but solid state three-axis magnetometers require tilt in addition to the Earth's magnetic vector to resolve heading. A measure of tilt is also desirable if the current meter cannot be assured of a vertical orientation. Two-axis MEMS accelerometers by Analog Devices, Inc. are capable of providing this tilt measurement but require temperature correction to remove a significant error at zero tilt. The determination and application of this temperature coefficient to correct the error has enabled a versatile attitude sensor to be incorporated in the modular acoustic velocity sensor (MAVS) for conversion of flow measurements by the sensor into Earth-coordinate currents. Residual tilt error is less than 0.3 degrees from 5degC to 28degC. Absolute accuracy of the sensor is better than 1deg between -50deg and +50deg and is better than 3deg between -70deg and +70deg. Because the accelerometer works equally well inverted, the current meter can be mounted upside down to place the velocity sensor above instead of below the housing without opening the case. A second socket for the accelerometer at right angles to the first permits a horizontal mounting of the current meter with only minor internal rearrangement of a part
Starting Page	1395
Ending Page	1398
File Size	388215
Page Count	4
File Format	PDF
ISBN	0780386698
DOI	10.1109/OCEANS.2004.1406325
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-11-09
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Solid state circuits Position measurement Temperature sensors Current measurement Acoustic sensors Earth Velocity measurement Accelerometers Coordinate measuring machines Rotation measurement
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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