Open AccessTilt sensor based on a dual‐axis microaccelerometer with maximum sensitivity and minimum uncertainty in the full measurement range
Author(s) -
Li Enfu,
Zhong Jiming,
Chang Honglong
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0407
Subject(s) - tilt (camera) , tilt sensor , root mean square , sensitivity (control systems) , inverse trigonometric functions , mathematics , accelerometer , range (aeronautics) , constant (computer programming) , control theory (sociology) , physics , mathematical analysis , optics , materials science , geometry , computer science , engineering , electronic engineering , quantum mechanics , artificial intelligence , optical fiber , composite material , programming language , control (management)
This work presents an approach to enhance the sensitivity and lower the uncertainty of a tilt sensor based on a dual‐axis accelerometer. The arctangent function arctan( a 2 / a 1 ) instead of traditional arcsine function arcsin( a 2 /g ) or arcsin( a 1 / g ) is used to solve for tilt angle. As a result, the measured sensitivity of tilt angle is kept in the maximum constant value (17.45 mg/°) and the measurement uncertainty is kept in the minimum constant value (0.033° for the tilt sensor of this work) in the measurement range of −90° to +90°. It is also experimentally verified that the solving method has the maximum sensitivity (the average value of 17.74 mg/° with a root mean square of 0.008 mg/°) and minimum uncertainty (the average value of 0.034° with a root mean square of 0.003°) compared with other solving methods in the range of −90° to +90°]. The output of tilt sensor in the range of −90° to+90° and +90° to +270° is axial symmetry about 90°, so it is easy to extend the measurement range to 360°. Therefore, the presented approach is proved to be effective to enhance tilt sensor sensitivity and lower the uncertainty.