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We demonstrate a novel polyvinyl chloride (PVC) diaphragm-based fiber-tip Fabry-Perot interferometer for gas pressure measurements with ultra-high sensitivity. The PVC diaphragm has been coated to the end facet of a well-cut standard single-mode fiber by use of a plastic welder. Ultrahigh pressure sensitivity of ∼66.07 nm/MPa at 1565 nm and a low temperature cross-sensitivity of —5.5 KPa/°C have been...
A new method to modify excessively titled fiber gratings (Ex-TFGs) with 20 nm gold nanoparticles (GNPs) through 3-mercapt-otrimethoxysilane(MPTMS) was proposed. By monitoring the wavelength shift of Ex-TFGs for every modified step and using the scanning electron microscope (SEM), it proves that GN Ps are firmly combined on the surface of Ex-TFGs. Finally, by using different concentration of NaCl solutions...
Comparing with uncoated LPFGs, ZnO coated LPFG shows obvious improvement of RI sensitivity between the RI range of 1.4 and 1.62. The proposed structure exhibits a very high sensitivity of 5175 nm/RIU in the RI range from 1.444 to 1.448, and the sensitivity could be further improved by optimizing the thickness of the ZnO thin film.
We demonstrated a high-robustness Fabry-Perot interferometer strain sensor based on an in-fiber elliptical bubble that was created by splicing together two sections of standard single mode fibers. Such a FPI could be used to develop a high-robustness strain sensor with a low cross-sensitivity between temperature and tensile stain. The sensitivity of this strain sensor was ∼2.4 pm/με, and exhibited...
Gas pressure sensor based on an antiresonant reflecting guidance mechanism in a hollow-core fiber (HCF) with an open microchannel is experimentally demonstrated. The microchannel is created on the ring cladding of the HCF by femtosecond laser to provide an air-core pressure equivalent to the external pressure. The HCF cladding functions as an antiresonant reflecting waveguide, which induces sharp...
A 1V fractional-N PLL is proposed in 40nm technology. With modified VCO, it can be operated under 1V supply with wide tuning range and low supply sensitivity. Besides, conventional 3rd MASH SDM is sensitive to nonlinearity caused by analog path, generating in-band fractional spur that cannot be filtered by PLL loop. In order to lower the sensitivity to nonlinearity, a new type of modulator is proposed...
The calibration of piezoelectric acoustic emission sensors mainly includes two methods, reciprocity method and surface pulse method. The former uses the principle of electro-acoustic reciprocity of piezoelectric sensors, and the latter needs a reference capacitance or laser system for displacement or velocity measurement. Prior studies have indicated that the two methods had some consistency, but...
In order to enhance the service quality of network community, satisfy the growing demand of community users, this paper analyzes the content of network community from different aspects and provides a comprehensive method to divide the network community user group. On one hand, this method use link analysis techniques to study hyperlink, calculate the number of output links and input links, and then...
Considering the normal operation possibility of the equipment and severity after fault in the process of equipment sensitivity evaluation, this paper focuses on the uncertainty happening in the actual event, and chooses entropy as the measure and then creates maximum hybrid entropy evaluation model. Based on this model, it can obtain the probability distribution and the membership with least subjective...
Hemoglobin (Hb) microbelts based biosensor was developed by directly electrospinning Hb onto the glassy carbon electrode surface without using any other immobilization matrix, offering an excellent electrochemical sensing platform. UV-vis spectroscopy and FTIR spectroscopy were performed to demonstrate that Hb still kept its native structure in the as-electrospun microbelts. The electrocatalytic property...
The assessment of equipment trip probability due to voltage sag is a complicated matter because of the uncertainties both from voltage sag in power systems and sensitive equipment in customer side. The uncertainties of influencing factors are difficult to determine especially the stochastic distribution of voltage tolerance of equipment. The characteristics of voltage sag are determined by sag severity...
In this paper, using this sensitivity algorithm to analysis of the problem of weak voltage area. After that, using the improvement of the traditional swarm algorithm to recover the weak volatage area. In this article, the inertial factor, the convergent factor and are introduced into the swarm algorithm. The model of the weak voltage recovery which is object to the minimization of the sensitive analysis...
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