共查询到19条相似文献,搜索用时 394 毫秒
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介绍了利用硅作衬底的陶瓷钛酸镧锶(SrLaTiO3)材料的半导体元件,独特的MIS结构元件,既具有光的特性,又可以测量湿度信号。利用光、湿敏特性元件设计成光、湿敏传感器。 相似文献
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研制了一种无湿敏材料的纺织基底无芯片RFID 湿度传感器用于检测环境湿度。通过射频仿真软件
HFSS,获得谐振频率在2. 45 GHz 具有较高品质因数的纺织基底谐振器模型,对以谐振频率偏移量作为灵敏度指标
的检测原理进行了仿真。利用丝网印刷工艺和刻绘工艺分别在不同类型纺织物上制作了无芯片RFID 湿度传感器,
系统研究了制作工艺、纺织品类型和厚度对传感器湿敏特性的影响。结果表明,0. 5 mm 厚度下不同基底类型湿度传
感器的灵敏度由高至低依次为:棉基底、亚麻基底、聚酯纤维基底,恢复特性呈相反顺序,其中棉基底传感器在高湿
范围内平均灵敏度达3. 8 MHz/ %RH,聚酯纤维基底传感器恢复度达86%;相同类型的棉纺织基底下基底厚度越大,
平均湿度灵敏度越高,恢复特性越差。传感器稳定性测试表明传感器具有较好的中长期稳定性。对纺织基底湿度
传感器的感湿机理进行了分析,纺织纤维中的亲水基团与水分子间形成氢键,改变了基底的介电参数,传感器的湿
敏特性与组成纺织品的纤维成分、纤维细度、编织方式有关。 相似文献
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1、电子封装科研院所 1.1总体情况 我国科研院所从事电子封装技术研究是与电子元器件的研制同时起步的,随着电子元器件技术的发展,电子封装技术也同步发展.特别是集成电路技术的发展,促进了电子封装技术日新月异的变化.封装形式从DIP、SOP到LCC、BGA、QFP等,管脚数从8条腿到280条都可以进行封装. 相似文献
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《电子技术与软件工程》2017,(10)
本文对基于SBA-15的QCM湿度传感器进行了三维有限元精确建模与数值仿真,分析了SBA-15湿敏薄膜材料对传感器的振动模态、中心频率、电学阻抗及Q值等性能参数的影响,为纳米湿敏薄膜的成膜工艺及新型QCM湿度传感器的优化设计与制造提供了重要的理论参考依据。 相似文献
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复合钒钛酸干凝胶薄膜的湿敏特性研究 总被引:1,自引:0,他引:1
采用sol-gel法制备了复合钒钛酸干凝胶(H2V10Ti2O30-y·nH2O)薄膜,并对其湿敏特性进行了研究。结果表明:该薄膜为层状结构。用此薄膜制备的湿敏元件,在RH为11%~95%的范围内,感湿特性曲线线性好,其响应、恢复时间分别为5s和20s,湿滞为RH2%,感湿温度系数为RH0.45%/℃,并具有良好的稳定性。H2V10Ti2O30-y·nH2O干凝胶薄膜湿敏元件的灵敏度和湿滞均优于复合钒酸(H2V12O31-y·nH2O)干凝胶薄膜湿敏元件。 相似文献
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Osamu Nakagawa Haruo Shimamoto Tetsuya Ueda Kou Shimomura Tsutomu Hata Toru Tachikawa Jiro Fukushima Toshinobu Banjo Isamu Yamamoto 《Journal of Electronic Materials》1989,18(5):633-643
As electronic devices become more highly integrated, the demand for small, high pin count packages has been increasing. We
have developed two new types of IC packages in response to this demand. One is an ultra thin small outline package (TSOP)
which has been reduced in size from the standard SOP and the other, which uses Tape Automated Bonding (TAB) technology, is
a super thin, high pin count TAB in cap (T.I.C.) package. In this paper, we present these packages and their features along
with the technologies used to improve package reliability and TAB. Thin packages are vulnerable to high humidity exposure,
especially after heat shock.1 The following items were therefore investigated in order to improve humidity resistance: (1)
The molding compound thermal stress, (2) Water absorption into the molding compound and its effect on package cracking during
solder dipping, (3) Chip attach pad area and its affect on package cracking, (4) Adhesion between molding resin and chip attach
pad and its affect on humidity resistance. With the improvements made as a result of these investigations, the reliability
of the new thin packages is similar to that of the standard thicker plastic packages. 相似文献
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介绍了新一代单片全校准温湿度传感器SHT11.采用CMOS芯片技术与传感器技术结合在一起构成了高集成度、小体积的数字式温湿度传感器,对传感器的性能参数、信号输出、非线性及温度补偿、I^2C的接口方式、便携式温湿度检测仪中的应用进行了研究。研究结果表明:该传感器具有稳定可靠,体积小,量化误差小,响应速度快,适用面广的特点。 相似文献
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Lan Kim Moo Whan Shin 《Components and Packaging Technologies, IEEE Transactions on》2007,30(4):632-636
Thermal transient measurements of high power GaN-based light-emitting diodes (LEDs) with multichip designs are presented and discussed in the paper. Once transient cooling curve was obtained, the structure function theory was applied to determine the thermal resistance of packages. The total thermal resistance from junction to ambient considering optical power is 19.87 K/W, 10.78 K/W, 6.77 K/W for the one-chip, two-chip and four-chip packages, respectively. The contribution of each component to the total thermal resistance of the package can be determined from the cumulative structure function and differential structure function. The total thermal resistance of multichip packages is found to decrease with the number of chips due to parallel heat dissipation. However, the effect of the number of chips on thermal resistance of package strongly depends on the ratio of partial thermal resistance of chip and that of slug. Therefore, an important thermal design rule for packaging of high power multichip LEDs has been analogized. 相似文献
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光纤光栅传感器监测混凝土简支梁裂缝的实验研究 总被引:6,自引:0,他引:6
以结构健康监测系统为研究背景,研究了光纤布拉格光栅(FBG)传感器。对FBG的研究起步并成熟于通信领域,而对其在土木工程领域的研究尚处于发展阶段。为了进一步促进FBG传感器的发展,推广其在工程中的应用,通过在混凝土简支梁的底部布置经纤维增强复合塑料(FRP)封装的准分布式FBG传感器和未经封装的准分布式FBG传感器,研究了准分布式FBG传感器对钢筋混凝土构件裂缝出现时的有效感知及定位问题。实验结果表明可实现裂缝的大致定位,经FRP封装的FBG传感器相对于裸光纤光栅,其应变灵敏度有所下降。 相似文献
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In this paper, by using differential measurements based around two SCP-1000 MEMS (microelectromechanical systems) sensors, a method of depth detection is proposed. A very-low-frequency (VLF) communications channel updates the moving sensor and provides corrections (along with an accelerometer, temperature, and humidity sensor for more precise measurements). For this, a single sensor, a SCP-1000 sensor made by VTI of Finland is used. These tiny chips, when used with the provided algorithms and internal temperature sensor, enable altitude measurements with resolutions better than1.5 Pa (-3.5 inches) across a dynamic range of 90 kPa (-34,750 feet). 相似文献