针对目前国内数字输出型热膜式空气流量计设计较少的现状,设计了一种基于硅MEMS新型热膜式AFS07空气流量传感器和PIC16F1786微控制器的数字输出型车用空气流量计。详细分析了该空气流量计的工作原理和检测电路、恒温差控制电路的设计,通...针对目前国内数字输出型热膜式空气流量计设计较少的现状,设计了一种基于硅MEMS新型热膜式AFS07空气流量传感器和PIC16F1786微控制器的数字输出型车用空气流量计。详细分析了该空气流量计的工作原理和检测电路、恒温差控制电路的设计,通过PIC16F1786微控制器产生了ECU所需频率范围为1.8~11 k Hz、占空比50%的方波流量信号和频率为19 Hz、占空比可变的矩形波温度信号。在此基础上对样机进行了实验。实验结果表明：该样机实现了对不同流量气体和进气温度的检测,且具有良好的温度补偿功能;同时得出该空气流量计输出信号的周期与其对应信号的输出电压之间呈线性关系。展开更多
为实现红外焦平面数字化输出,设计了一款片上集成行列级读出电路,适应于SOI(silicon on insulator)二极管型非制冷红外探测器阵列.读出电路包括一个连续时间增量型二阶sigma-delta调制器和一个输出缓冲器,其中二阶sigma-delta调制器包...为实现红外焦平面数字化输出,设计了一款片上集成行列级读出电路,适应于SOI(silicon on insulator)二极管型非制冷红外探测器阵列.读出电路包括一个连续时间增量型二阶sigma-delta调制器和一个输出缓冲器,其中二阶sigma-delta调制器包括跨导模块、跨导运算放大器构成的积分器模块、电流型DAC反馈模块以及比较器.基于此提出的读出电路架构,采用直接数字量化的方式,完全省去了前端模拟放大单元电路.利用连续时间增量型二阶sigma-delta调制器对输入信号驱动要求低的特点,该电路可直接处理SOI二极管型红外探测器输出的相对微弱的电压信号,并输出数字信号.基于SMIC 0.35μm CMOS工艺对电路进行了设计并流片验证,供电电压5 V,读出电路版图通道宽度小于30μm,适应探测器像素尺寸.测试结果表明, 60帧频读出时,读出性能良好,输出噪声9μV,单通道功耗450μW,面积0.092 mm^2.该读出电路相比于普通片上集成行列级读出电路,减小了面积和功耗,简化了整个红外成像系统,适用于低功耗、低噪声、高集成度的大面阵数字化红外传感器成像系统.展开更多
High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sens...High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions.展开更多
文摘针对目前国内数字输出型热膜式空气流量计设计较少的现状,设计了一种基于硅MEMS新型热膜式AFS07空气流量传感器和PIC16F1786微控制器的数字输出型车用空气流量计。详细分析了该空气流量计的工作原理和检测电路、恒温差控制电路的设计,通过PIC16F1786微控制器产生了ECU所需频率范围为1.8~11 k Hz、占空比50%的方波流量信号和频率为19 Hz、占空比可变的矩形波温度信号。在此基础上对样机进行了实验。实验结果表明：该样机实现了对不同流量气体和进气温度的检测,且具有良好的温度补偿功能;同时得出该空气流量计输出信号的周期与其对应信号的输出电压之间呈线性关系。
基金supported by the National Natural Science Foundation of China (Grant Nos. 91023036 and 51275018)
文摘High performance force sensors often encounter the conflicting requirements of high resolution and large measurement range.To address this problem,this paper presents a conceptual design of a novel uniaxial force sensor with large range and dual-stage force resolutions which enables us to measure forces within a wide range with satisfied resolutions.The newly developed force sensor features an aluminum alloy body with a probe to transfer external forces into the sensing element.It employs an optical linear encoder to detect the displacement of the sensing body.This sensing scheme may immunize outside electromagnetic noises and therefore enhance the performance of the sensor thanks to its digital signal output.In this paper,an accurate,analytical model for calculating the static stiffness and dynamics of the system was developed by using pseudo-rigid-body-model(PRBM)methodology.To optimize the design,finite element simulations were conducted.After a prototype sensor was fabricated,preliminary characterization tests were carried out to verify the accuracy of the theoretical model and demonstrate the effectiveness of the design.The experiment results indicate that the structure of the new sensor is compact,and it has the ability to measure both micro range and macro range forces within one setup,meanwhile keeps very fine resolutions.
