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This paper presents a subthreshold frequency reference-less temperature sensor. Compared with the previous designs that rely on external frequency references or excessive analog blocks, this work proposes a novel subthreshold ratioed-current/delay sensor core and hybrid-domain all-digital processing technique, which eliminates the dependence on frequency reference and is scalable to technology feature...
The ammonia microsensor is fabricated by the 0.35 µm complementary metal oxide semiconductor (CMOS) process. The sensor is composed of a sensitive film and polysilicon electrodes. Area of the ammonia microsensor is about 1 mm2. The sensitive film of the ammonia microsensor is zinc oxide prepared by hydrothermal method. The sensor requires a wet etching process to remove the sacrificial oxide layer...
A low cost wavelength calibration method for Fiber Bragg Grating sensor system is studied in this paper. An enhanced sensitivity FBG is used in the sensor system to calibrate the wavelength drift. Because the expensive temperature insensitive fiber Fabry-Perot interferometer and temperature control unit are not needed, the cost of system is reduced. The experimental results show that the wavelength...
We researched a typical coherent optical time domain reflectometry system in which Rayleigh backscattering in a single-mode optical fiber was measured by coherent OTDR employing with a precisely frequency-controlled light source. The system can measure distributed temperature and strain with a resolution of 0.01°C and a spatial resolution of 1 m in km-long fiber. Our simulation confirmed that the...
The fault of wind turbine blades in practical use is analyzed in this article and the sensing theory of optical fiber Brillouin sensor is introduced. A temperature and strain online monitoring system based on Brillouin optical time domain analysis (BOTDA) is proposed as well. By applying this technique, the crack as small as 1.5 cm can be detected by BOTDA sensor, which meets the fault localization...
Piezoelectric ultrasonic transducer is the transducer which is technically designed for electrical measurement of non-medical electrical capacity, some physiology parameters of human body like blood pressure, pulse, breathe, body temperature, and etc. are non-electrical capacity. In order to measure these physiological parameters, the simplest way is to change them for the project is technically easier...
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