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The different noise components in a dual-mass micro-electromechanical system (MEMS) gyroscope structure is analyzed in this paper, including mechanical-thermal noise (MTN), electronic-thermal noise (ETN), flicker noise (FN) and Coriolis signal in-phase noise (IPN). The structure equivalent electronic model is established, and an improved white Gaussian(More)
This paper focuses on an optimal quadrature error correction method for the dual-mass MEMS gyroscope, in order to reduce the long term bias drift. It is known that the coupling stiffness and demodulation error are important elements causing bias drift. The coupling stiffness in dual-mass structures is analyzed. The experiment proves that the left and right(More)
A noise reduction algorithm based on an improved empirical mode decomposition (EMD) and forward linear prediction (FLP) is proposed for the fiber optic gyroscope (FOG). Referred to as the EMD-FLP algorithm, it was developed to decompose the FOG outputs into a number of intrinsic mode functions (IMFs) after which mode manipulations are performed to select(More)
BACKGROUND/AIMS Hashimoto's encephalopathy is considered as a treatable dementia, but it is often misdiagnosed. We investigated cognitive impairment and the MRI pathology of Hashimoto's encephalopathy patients. METHODS The study comprised eight patients with Hashimoto's encephalopathy, 16 patients with mild Alzheimer's disease and 24 healthy subjects. A(More)
This paper describes the design and implementation of a radiosonde which can measure the meteorological temperature, humidity, pressure, and other atmospheric data. The system is composed of a CPU, microwave module, temperature sensor, pressure sensor and humidity sensor array. In order to effectively solve the humidity sensor condensation problem due to(More)
The Surface enhanced fluorescence (SEF) and Surface Enhanced Raman Scattering (SERS) of Au nanoparticle films deposited on Si and SiO2 substrates are presented. From the experimental results, it is concluded that the fluorescence peak intensity changes in a similar way with the Raman intensity for the various substrates. Both the fluorescence and the Raman(More)
Resonant Tunneling Diodes (RTD) and High Electron Mobility Transistor (HEMT) based on GaAs, as the piezoresistive sensing element, exhibit extremely high sensitivity in the MEMS sensors based on GaAs. To further expand their applications to the fields of MEMS sensors based on Si, we have studied the optimization of the GaAs epitaxy layers on Si wafers.(More)
Aiming at the relationships of the high altitude meteorological parameters, such as longitude, latitude, atmospheric pressure, temperature and humidity, the methods of least squares fitting test data and error analysis by MATLAB are proposed in this paper. Temperature, humidity and air pressure change curve equations are established at the different(More)