The paper addresses the problem of experimental studies of miniature tilt sensors based on low-range accelerometers belonging to Microelectromechanical Systems (MEMS). A custom computer controlled test rig is proposed, whose kinematics allows an arbitrary tilt angle to be applied (i.e. its two components: pitch and roll over the full angular range). The related geometrical relationships are presented along with the respective uncertainties resulting from their application. Metrological features of the test rig are carefully evaluated and briefly discussed. Accuracy of the test rig is expressed in terms of the respective uncertainties, as recommended by ISO; its scope of application as well as the related limitations are indicated. Even though the test rig is mostly composed of standard devices, like rotation stages and incremental angle encoder, its performance can be compared with specialized certified machines that are very expensive. Exemplary results of experimental studies of MEMS accelerometers realized by means of the test rig are presented and briefly discussed. Few ways of improving performance of the test rig are proposed.
The advance of MEMS-based inertial sensors successfully expands their applications to small unmanned
aerial vehicles (UAV), thus resulting in the challenge of reliable and accurate in-flight alignment for airborne
MEMS-based inertial navigation system (INS). In order to strengthen the rapid response capability
for UAVs, this paper proposes a robust in-flight alignment scheme for airborne MEMS-INS aided by global
navigation satellite system (GNSS). Aggravated by noisy MEMS sensors and complicated flight dynamics,
a rotation-vector-based attitude determination method is devised to tackle the in-flight coarse alignment
problem, and the technique of innovation-based robust Kalman filtering is used to handle the adverse impacts
of measurement outliers in GNSS solutions. The results of flight test have indicated that the proposed
alignment approach can accomplish accurate and reliable in-flight alignment in cases of measurement outliers,
which has a significant performance improvement compared with its traditional counterparts.
The development of digital microphones and loudspeakers adds new and interesting possibilities of their applications in different fields, extended from industrial, medical to consumer audio markets. One of the rapidly growing field of applications is mobile multimedia, such as mobile phones, digital cameras, laptop and desktop PCs, etc. The advances have also been made in digital audio, particularly in direct digital transduction, so it is now possible to create the all-digital audio recording and reproduction chains potentially having several advantages over existing analog systems.
In this work the construction of experimental setup for MEMS/NEMS deflection measurements is presented. The system is based on intensity fibre optic detector for linear displacement sensing. Furthermore the electronic devices: current source for driving the light source and photodetector with wide-band preamplifier are presented.
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