共查询到20条相似文献,搜索用时 109 毫秒
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针对放入式电子测压器所遇到的问题设计了一种基于电容式传感器的压力测试系统,采用壳体本身作为压力敏感元件,实现压力传感器与壳体一体化,通过测量壳体本身的应变就可以实现压力的测试,既减小体积又降低成本;文中详细介绍了该测试系统的工作原理,而且考虑到机械加工及安装精度的影响,主要对壳体电容的结构进行计算分析,对测压器进行了动态校准,验证了该设计方案是可行的。 相似文献
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介绍了一种温度补偿方法的基本原理,其解决了微型压阻式压力传感器温补问题;详细阐述了一种实用的整体补偿电路,并从理论上导出了分析计算公式,最后给出传感器整体的零位和灵敏度温度系数在补偿前后的对比情况. 相似文献
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额定量程内称重传感器的非线性误差不同,为此阐述了称重传感器的非线性误差特性,提出了一种非线性误差自适应分段补偿方法:在额定量程的上限区,采用基于径向基函数神经网络(RBFNN)的补偿网络完成传感器非线性误差补偿;在下限区,采用数字滤波器完成非线性误差补偿;在中间区,传感器不补偿。同时利用自适应选择网络,完成了分段补偿的选择。实验表明,采用这种方法补偿后的称重传感器下限区、中间区与上限区的最大相对误差分别由补偿前的0.2、0.4、1.37下降到0.16、0.04、0.07,补偿效果明显。 相似文献
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《自动化仪表》2021,(8)
金属壳体振动陀螺具有结构简单、精度高、体积小、可靠性高、寿命长等显著优势,在军用和民用领域都有广阔的应用前景。由于受材料特性影响,金属壳体谐振结构的Q值很难达到极高的水平,使得金属壳体振动陀螺的零偏漂移受温度的影响比较显著。传统的温度补偿方法存在滞回效应,补偿效果不理想。针对该问题,提出了一种多参数温度补偿方法。理论分析结果表明,力反馈模式下,阻尼不均匀变化是引起陀螺零偏漂移的主要因素。根据理论分析结果,选取正交反馈量、温度、驱动电压等三个变量作为补偿量;通过全温区测试,建立陀螺零偏漂移与补偿量的数学模型,利用该模型对陀螺零偏漂移进行补偿。补偿后,陀螺的全温区零偏漂移由补偿前的300 (°)/h减小为10 (°)/h,而采用传统温度补偿方法后的零偏漂移为35(°)/h,验证了该方法的有效性。 相似文献
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基于柔性电极结构,本文设计、制作了薄膜电容微压力传感器,在阐述传感器工作原理的基础上,提出了两种设计思路,即基于柔性纳米薄膜的电容式微压力传感器和具有微结构的柔性电极薄膜电容式微压力传感器,并结合传感器的结构和柔性材料的加工特性,进一步提出了相应的力敏特性材料结构优化思路和加工流程,利用该流程得到了一种结构轻薄、工艺简单、高灵敏度的微压力传感器。经测试,本文制作的压力传感器的灵敏度能够达到218 fF/mmHg,在智能穿戴和可植入压力检测等领域显示出较好的应用前景。 相似文献
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采用溶胶-凝胶和旋涂技术制备了基于Si-NPA的BaTiO3薄膜(BaTiO3/Si-NPA).场发射扫描电镜和X射线衍射实验表明,钙钛矿结构BaTiO3薄膜很好地覆盖了Si-NPA表面.通过蒸镀双面梳状电极,制作了电容型BaTiO3/Si-NPA湿敏元件并对其湿敏性能进行了测试.结果表明,室温下湿敏元件在11%~95%RH范围内具有很高的灵敏度和较快的响应速度,且电容值的对数对湿度呈现出很好的线性.虽然该薄膜湿敏元件在不同湿度下均存在温度漂移,但分析表明这种漂移有可能通过电极设计或信号补偿加以解决. 相似文献
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In view of the shortcomings of silicon micro acceleration sensor based on piezoresistive effect and capacitance principle,
such as temperature drift, low resolution and poor anti-interference ability, a fuze acceleration sensor based on dual SAW devices is
proposed. The sensor adopts a dual saw device structure, one is coated with a sensitive film for measurement, the other is an uncoat-
ed reference channel for compensation of environmental temperature, pressure, humidity and other factors. The experimental results
show that the maximum linear error is only 1.6%, the sensitivity is 54.3Hz/g, and the maximum hysteresis error is less than 1%.
Compared with piezoresistive accelerometer and capacitive accelerometer, the linear error of the accelerometer is small, the sensitivi-
ty is high, and it has strong anti-interference ability. 相似文献
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A novel capacitive pressure sensor with the island-notch structure is introduced. Its theory model is established based on the structure theory of the plate capacitive pressure sensor. The relationships between the external pressure and capacitance of the capacitive pressure sensor with the island-notch structure are studied by using the method of the finite element analysis (FEA). The results show that the linearity of the capacitive pressure sensor with island-notch structure reached up 0.9941 in the linear measurement zone, the sensitivity reached up 0.0019 pF/kPa, and the measurement range of the capacitive pressure sensor is enlarged. Thus, the contradictory among measure sensitivity, linearity and measure range is effectively relieved in the capacitive pressure sensors with island-notch. In addition, the interface circuitry of the charge transfer is designed, and the performance of the interface circuitry is analyzed. 相似文献
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介绍一种以多晶硅薄膜为敏感材料的压力传感器。该传感器利用了双岛结构膜片的应力集中效应,灵敏度得到提高,且具有良好的线性度和过载能力。 相似文献
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设计制作了一种集成信号调理电路的高温压阻式压力传感器,包含倒装式的压敏敏片、无源电阻温度补偿电路和信号调理电路组成;压敏芯片的制作采用SOI材料和MEMS标准工艺,温度补偿和信号调理电路采用高温电子元件;试验表明,无源电阻温度补偿具有显著的效果;此外,采用了高温信号调理电路来提高传感器的输出灵敏度,通过温度补偿来降低输出灵敏度;与传统的经验算法相比,所提出的无源电阻温度补偿技术具有更小的温度漂移,在220℃条件下传感器输出灵敏度为4.93 mV/100 kPa,传感器灵敏度为总体测量精度为±2%FS;此外,由于柔性传感器的输出电压可调,因此不需要使用一般的电压转换器随动压力变送器,这大大降低了测试系统的成本,有望在恶劣环境下的压力测量中得到高度应用。 相似文献
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This paper describes the design and fabrication of a capacitive pressure sensor that has a large capacitance signal and a high sensitivity of 76 pF/bar in touch mode operation. Due to the large signal, problems with parasitic capacitances are avoided and hence it is possible to integrate the sensor with a discrete components electronics circuit for signal conditioning. Using an AC bridge electronics circuit a resolution of 8 mV/mbar is achieved. The large signal is obtained due to a novel membrane structure utilizing closely packed hexagonal elements. The sensor is fabricated in a process based on fusion bonding to create vacuum cavities. The exposed part of the sensor is perfectly flat such that it can be coated with corrosion resistant thin films. Hysteresis is an inherent problem in touch mode capacitive pressure sensors and a technique to significantly reduce it is presented. 相似文献