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This paper proposes a novel method to acquire MEMS resonator's temperature based on the measurement of quality factor via continuous ring-down without additional thermometer. Quality factor, a parameter of resonator is utilized as a virtual thermometer, which attenuates measuring hysteresis and improves the performance of temperature compensation. In addition, to precisely measure the quality factor,...
AT-cut Quartz crystal Microbalance (QCM) has been used as a high precision sensor for decades, which could detect the trace mass deposited on the crystal surface. The accuracy of QCM can be achieved ng level. When used as biosensor in liquid, the resonant frequency is not only affected by the mass change, but also by the liquid density and viscosity, which are greatly dependent on the liquid temperature...
This paper presents two methods for the efficiency measurement of a white light emitting diode (LED) without optical sensors for measuring light intensity. The proposed methods are based on the measurement of the power loss of a white LED. Because all the power loss of a white LED is transferred into heat, it is possible to evaluate the power loss by measuring the temperature of the heat sink attached...
We report on a fiber sensor by combining an MZI with temperature sensitivity as high as 98.53 pm/°C and can FBG in a high Ge-doped fiber. This sensor shows a be applied in simultaneous measurement of temperature and strain.
We proposed a novel evaluation method of heat dissipation capability of the helix slow-wave structure (SWS). A distributed micro fiber Bragg grating (FBG) sensor array is designed to measure the temperature distribution of the helix in SWS. An experiment on two X-band SWSs of different heat dissipation capability is made and the results show that our method can effectively be used to estimate and...
3D system-in-package has recently been considered a major enabler for high density and heterogeneous microsystem integration. We hereby proposed the concept of a unified micromachining and packaging platform based on LTCC (low temperature cofired ceramic) material system and process, which is implemented by first enhancing an existing LTCC hybrid IC fabrication line and then integrating different...
A silicon heat sink with grooved mirror was fabricated by micro-processing technology, then a 5W blue 2×2 LED array with Silicon-based heat sink was accomplished by way of studying its heat conduction. Firstly, the optical ray trace simulation of the array was carried out to study the relationship between light profile and lens shaped, groove height. Then according to the optical simulation results,...
The growths of InGaN quantum wells light-emitting diodes with AlInN thin barrier were performed by metal-organic chemical vapor deposition, and this approach led to reduction in thermionic carrier escape and efficiency droop.
Growth studies of AlInN alloys with different indium contents were performed by metalorganic chemical vapor deposition. The optimized growth condition for lattice-matched alloy is obtained at growth temperature of 780°C and pressure of 20 Torr.
This paper reports the designing, simulation and initial experimental investigation into a LTCC vacuum microsystem package substrate acting both as a vital panel and a functional structure for compact system-in-package (SiP) integration. Design, validation and experimental results for microchannels with different planar axial shapes are presented. Experimental and simulated temperature distribution...
The heat dissipation of six different types of microchannel networks integrated in LTCC based microsystems has been investigated by experimental measurement and simulation analysis, including straight, serpentine, spiral and fractal-shaped microchannel networks of curve, I-shaped and parallel. The cross section of microchannel is 200 ??m ?? 200 ??m and the total length is about 200 mm. The water mass...
A successful nonlinear calibration method for fiber Bragg grating (FBG) temperature sensor system based on wavelength-division multiplexing was proposed and demonstrated theoretically and experimentally. In consideration of the nonlinear relation between FBG center wavelength and temperature due to thermal expansion and thermo-optic effect, linear and nonlinear curve fittings were used to evaluate...
The Magnetically Controlled Shape Memory Alloy (MSMA) is a new functional material which is found in recent years. MSMA has characteristics of large deformation rate and high response frequency in the martensite state. It is an important potential material for the next generation of intelligent actuators and sensors. This paper takes Labview virtual instrument as the core of external properties test...
Based on quantum chemical descriptors and topological descriptors, temperature-dependent predictive models for vapor pressures (P) of oxygen-containing polycyclic aromatic hydrocarbons (OPAHs) were developed following a variable selection procedure. The cross-validated Qcum4 of the final model, 0.930, shows that the model has good predictive ability and robustness. In view of difficulties to measurements...
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