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Ultra-Thin Flexible Eddy Current Sensor Array for Gap Measurements 被引量:10
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作者 丁天怀 陈祥林 黄毅平 《Tsinghua Science and Technology》 SCIE EI CAS 2004年第6期667-671,共5页
An ultra-thin flexible eddy current proximity sensor array was developed for online measurements of tiny gaps between large smooth metallic and nonmetallic surfaces of arbitrary shapes. The probe of the flexible eddy ... An ultra-thin flexible eddy current proximity sensor array was developed for online measurements of tiny gaps between large smooth metallic and nonmetallic surfaces of arbitrary shapes. The probe of the flexible eddy current sensor array, which includes a set of sensor coils, is fabricated on a thin flexible substrate using the flexible printed circuit board process which allows the probe to be very thin and flexible so that it can conform to the surface geometry of the measured objects. The sensor coils are connected to an inductance-capacitance oscillator, which converts the distance between the sensor coil and the metallic target to a frequency output. Experimental results show that the measurement accuracy of the sensor system can reach ±0.5% for a 2-mm gap and the sensor system is suitable for online gap measurements. 展开更多
关键词 eddy current testing flexible sensor array gap measurement time division multiplexing
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Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe(3-x)Sex
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作者 崔珊 何兰坡 +3 位作者 洪晓晨 朱相德 Cedomir Petrovic 李世燕 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期89-92,共4页
It was found that selenium doping can suppress the charge-density-wave(CDW) order and induce bulk superconductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point... It was found that selenium doping can suppress the charge-density-wave(CDW) order and induce bulk superconductivity in ZrTe3. The observed superconducting dome suggests the existence of a CDW quantum critical point(QCP) in ZrTe3-xSex near x ≈ 0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe(3-x)Sex single crystals(x = 0.044 and 0.051) down to 80 m K. For both samples, the residual linear term κ0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe(3-x)Sex,which indicates conventional superconductivity despite of the existence of a CDW QCP. 展开更多
关键词 superconductivity charge-density-wave order thermal transport measurement gap structure
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High-accuracy stretched-wire measurement system for cryogenic permanent magnet undulator(CPMU)in High Energy Photon Source(HEPS) 被引量:1
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作者 Zhiqiang Li Wan Chen +7 位作者 Huihua Lu Lingling Gong Shuchen Sun Lei Zhang Yufeng Yang Xiaoyu Li Shutao Zhao Xiangzhen Zhang 《Radiation Detection Technology and Methods》 CSCD 2020年第4期492-496,共5页
A new stretched-wire system is built for a cryogenic permanent magnet undulator in High Energy Photon Source Testing Facility.The system has two functions:integral field measurement and magnet gap measurement.Integral... A new stretched-wire system is built for a cryogenic permanent magnet undulator in High Energy Photon Source Testing Facility.The system has two functions:integral field measurement and magnet gap measurement.Integral field measurement and gap measurement are important for evaluation and optimization of the magnetic performance of the undulator in cryogenic-vacuum environment.Two high-precision,high-load motion stages are used for accurate positioning.A special fix structure of stretched wire is adopted for vacuum environment.To reduce the deflection of the 3-meter-long wire,constant tension is maintained along the wire.The measurement repeatability of field integral and magnetic gap is the key performance which depends on the stability of wire and suppression of the electric noise.Strategy of improving the measurement accuracy and stability is presented. 展开更多
关键词 Magnetic measurement system Cryogenic permanent magnet undulator Stretched wire Integral field measurement gap measurement
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An experimental method for squealer tip flow field considering relative casing motion 被引量:9
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作者 Fei ZENG Jinlin DU +3 位作者 Lin HUANG Liming XUAN Qiang ZHAO Zhengping ZOU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第7期1942-1952,共11页
Squealer tip is widely used in turbines to reduce tip leakage loss.In typical turbine environment,the squealer tip leakage flow is affected by multiple factors such as the relative casing motion and the wide range of ... Squealer tip is widely used in turbines to reduce tip leakage loss.In typical turbine environment,the squealer tip leakage flow is affected by multiple factors such as the relative casing motion and the wide range of variable incidence angles.The development of experimental methods which can accurately model the real turbine environment and influencing factors is of great significance to study the squealer tip leakage flow mechanism.In the present paper,a low-speed turbine cascade test facility which can model the relative casing motion and wide range of variable incidence angles(-25°to 55°)is built.Based on the similarity criteria,a high-low speed similarity transformation method of the turbine cascade is established by considering the thickness of the turbine blade.A combined testing method of Particle Image Velocimetry(PIV)and local pressure measurement is proposed to obtain the complex flow structures within the tip cavity.The results show that the experimental method can successfully model the relative casing motion and the wide range of variable incidence angles.The low-speed cascade obtained by the similarity transformation can model the high-speed flow accurately.The measurement technique developed can obtain the complex flow field and successfully capture the scraping vortex within the squealer tip. 展开更多
关键词 Blade tip/casing gap measurement Particle Image Velocimetry(PIV) Relative casing motion Similarity transformation TURBINE Wide range of variable incidence angles
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