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The use of an artificial neural network (ANN) for extraction of a temperature profile from a local Brillouin gain spectrum in a Brillouin optical time-domain analysis fibre sensor system is proposed and demonstrated. An ANN is applied to process the Brillouin time-domain trace in order to extract the temperature information along the fibre after the data acquisition process. The results show that...
We present using a single tilted moiré fiber Bragg grating for simultaneous measurement of refractive index and temperature using the discrete wavelet transform technique. The former is obtained from the differential shift between the Bragg and cladding modes, and the latter from the Bragg mode shift only.
This work presents an 8 × 8 CMOS thermal sensor array for real-time, localized detection of the thermal energy produced by enzyme-catalyzed glucose reaction. The current of the PMOS sensing transistor is converted to a sawtooth-like waveform whose slope increases with respect to the temperature. Each of the sensing transistors occupies an area of 25 μm by 23 μm, which...
An integrated high-sensitivity CMOS MEMS capacitive accelerometer with thermal stability has been designed and demonstrated in this work. Issue of obtaining stable DC bias at input terminals is particularly addressed. Sensitivity of 595 mV/g is achieved in the accelerometer and the overall noise floor is 50 μg/√Hz, which corresponds to an effective capacitance noise floor of 0.024 aF/√Hz. The zero-g...
A simple sensor head based on a single fiber Bragg grating (FBG) coated partly by a strong instant adhesive has been proposed. Simultaneous measurement of temperature and strain has been realized.
We investigate the temperature property of a polarization-maintaining photonic crystal fiber based Sagnac interferometer. The temperature induced air pressure effect inside air holes of the fiber has been studied, from room temperature to 200 °C.
This work presents the design and characterization of a CMOS-integrated thermal sensor that features a novel oscillator-based sensing interface to achieve a high thermoelectric sensitivity. The thirty pairs of thermocouples are made of n+/p+ polysilicon of a standard 0.18-mum CMOS to produce a large thermoelectric voltage. The produced thermoelectric voltage is used to control the bias current of...
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