共查询到18条相似文献,搜索用时 156 毫秒
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利用FLUENT软件,采用功率替代温度的优化方法计算出气流式水平姿态传感器密闭腔体内的温度分布图,分别计算了传感器在不同倾角状态下和不同环境温度下密闭腔体内的温度场分布情况,计算和实验结果表明:气流式水平姿态传感器的两热敏电阻丝的温度差与倾角有很好的线性关系,它们之间的变化率为2.618 3 K/(o);环境温度对传感器的两热敏电阻丝的温度差的影响也是有线性关系的,倾角为24o时它们之间的变化率为–0.135 9K/K,与实验结果有很好的相似度。 相似文献
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在传感器测量电路中,温度是影响传感器特性的重要因素。由于传感器实际工作环境的温度变化幅度很大,需要采用温度补偿技术来抑制环境温度对传感器特性的影响。本文针对惠斯通电桥压力传感器温度补偿电路及霍尔传感器温度补偿电路中的温度补偿方法进行原理分析,以期达到在其他传感器测量电路中能够选择合适温度补偿方法的目的。 相似文献
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本课题研究了温度自补偿对FBG压力传感器的作用。在压缩和牵拉FBG或温度变化时,FBG周期与反射率会发生变化,从而使光纤光栅中心波长相应漂移。本课题设计的FBG传感器,可以用来分析中心波长漂移与水位的对应变化关系,同时消除环境温度与结构热膨胀的影响。与通常的FBG传感器相比,该传感器的结构用来消除温度对压力测量结果的影响,实现温度的自补偿,对于解决温度和压力交叉敏感的问题具有指导性意义。本课题分析了传感原理,进行了温度和压力测试,显示出传感器性能优良,在0-500厘米的水位压力内,精度达5‰FS,分辨率1.3cm,重复性误差0.863%,线性误差0.415%. 相似文献
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介绍电涡流传感器位移测量原理,分析温度变化时传感器线圈和探头热胀冷缩在测量位移过程中造成的温度漂移现象.针对传感器的温漂,研制出具有温度补偿功能的电涡流传感器热稳定性标定装置,对传感器输出电压进行温度补偿,减小温度变化对传感器输出电压的影响.同时介绍利用该装置进行温度标定的实现方法,并进行实验验证,实现固定位移条件下环境温度变化时对电涡流传感器输出电压的标定,与无温度补偿时输出电压对比,电压变化量减小了近50%. 相似文献
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In order to reduce the influence of temperature on the image point coordinates of industrial cameras in visual measurement, the image point drift caused by the self-heating of the camera was studied, and a compensation method for the thermal image point drift of industrial cameras was proposed. The finite element simulation analysis of the industrial camera model through Ansys Workbench shows that the self-heating of the industrial camera will cause the imaging optical path change and sensor expansion change, quantitatively the influence of the optical path change and sensor expansion on the image point coordinates was analyzed, and the image point drift compensation model was established. A large number of experiments have shown that the image point drift error compensated by the model is reduced from 0.4-0.6 pixel to 0.1-0.2 pixel, which is equivalent to the image point drift suppression effect achieved by hardware thermal control. However, compared with the thermal control device, the method of using the model for compensation has obvious advantages of simple structure and low cost. The temperature compensation model proposed in this research provides a theoretical basis for reducing the image point drift error caused by the self-heating of the camera in the visual measurement. 相似文献
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由于材料、加工工艺以及传感器的工作原理等因素,使得传感器普遍存在着非线性及温度漂移等问题。为提高传感器的测量精度,设计了一种基于PGA309的信号调理电路,在分析电路各功能模块的基础上,详细介绍了外围电路的设计方案,根据传感器的理论数学模型,对软件补偿算法进行了详细分析,给出了算法流程,通过软硬件的结合实现了传感器误差... 相似文献
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N. P. Futane S. RoyChowdhury C. RoyChaudhuri H. Saha 《Analog Integrated Circuits and Signal Processing》2011,67(3):383-393
The paper focuses on the design of a CMOS analog ASIC for temperature-drift compensation of a high sensitivity piezoresistive
micro-machined porous silicon pressure sensor to avoid analog-to-digital conversion, limit chip area and reduce power consumption.
For implementing the compensation circuitry, multilayered perceptron (MLP) based artificial neural network (ANN) with inverse
delayed function model of neuron has been optimized. The temperature drift compensation CMOS ASIC has been implemented to
make porous silicon pressure sensor an excellent SMART porous silicon pressure sensor. Using the compensation circuit, the
error in temperature-drift has been minimized from 93% to about 0.5% as compared to 3% using conventional neuron model in
the temperature range of 25–80°C. The entire circuit has been designed using 0.35 μm AMS technology model and simulated using
mentor graphics ELDO Simulator. 相似文献
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针对光纤布拉格光栅(Fiber Bragg Grating,FBG)应变传感器受环境温度影响而造成的波长漂移问题,提出粒子群优化(Particle Swarm Optimization,PSO)结合滑动窗口极限学习机(Sliding Window Extreme Learning Machine,SWELM)的在线预测算法对其进行温度补偿。利用PSO算法优化SWELM网络滑动窗口和隐含层神经元数目,提升了模型的预测精度,模型预测均方根误差最小能达到0.06pm。PSO-SWELM实现了对应变传感器数据的在线更新及波长漂移预测,对实时测量数据和预测数据进行差分运算完成温度补偿。与SWELM的对比分析结果表明,PSO-SWELM算法的预测精度平均提升了11.04%,并具有良好的温度补偿效果。 相似文献