共查询到19条相似文献,搜索用时 62 毫秒
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基于函数变换原理的铂电阻传感器非线性校正方法 总被引:6,自引:0,他引:6
:提出了一种基于函数变换原理的铂电阻传感器非线性校正方法.在函数变换原理的基础上导出了线性化条件的解析式,并给出了三种铂电阻温度计非线性校正电路,这三个电路具有相同的数学表达形式,为此对其中一个电路做了验证性实验.实验证明:在-200℃~ 650℃范围内,测温误差小于±1℃.这种方法也可用于其它传感器非线性输出的校正. 相似文献
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复合测温传感器是利用接触和非接触复合测温技术研制成功的一种新型测温传感器,它兼有接触式测温的直接、准确的特点,又有非接触式测温的耐腐蚀和耐高温、高压的 相似文献
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传感器非线性的硬件校正方法 总被引:14,自引:4,他引:14
从应用的角度总结了传感器非线性的硬件校正方法 ,讨论了这些方法的优点、局限和应用技巧。讨论结合实例 ,实用性强 ,对传感器非线性的硬件校正技术具有较好的指导作用。 相似文献
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人工神经网络在传感器非线性校正上的应用 总被引:10,自引:1,他引:10
讨论了利用人工神经网络对浓度传感器进行非线性较正的原理以及神经网络权值的调整算法,并利用VB编程语言设计了非线性正参数的计算程序。 相似文献
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高精度铂电阻非线性校正及其优化设计 总被引:5,自引:0,他引:5
介绍应用有源电桥及正反馈作用对铂热电阻非线性进行高精度校正的方法及其切比雪夫优化设计的方法,给出了理论解析表达式。介绍了理想情况下可以完全消除三线制测量时引线电阻影响的改进型实用有源电桥。 相似文献
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针对实际传感器的非线性问题,结合遗传算法和模拟退火算法的优点,提出了一种基于退火遗传算法的传感器非线性校正方法.该算法通过计算传感器自校正方程中的待定常数,实现非线性特性的线性化.实验结果表明:该方法不但可以实现非线性校正,而且校正后的精度也高于传统的最小二乘法. 相似文献
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Simple and efficient method of calibrating a motorized zoom lens 总被引:3,自引:0,他引:3
Yong-Sheng Chen Sheng-Wen Shih Yi-Ping Hung Chiou-Shann Fuh 《Image and vision computing》2001,19(14):1099-1110
In this work, three servo motors are used to independently control the aperture, zoom, and focus of our zoom lens. Our goal is to calibrate, efficiently, the camera parameters for all the possible configurations of lens settings. We use a calibration object suitable for zoom lens calibration to deal with the defocusing problem. Instead of calibrating the zoom lens with respect to the three lens settings simultaneously, we perform the monofocal camera calibration, adaptively, over the ranges of the zoom and focus settings while fixing the aperture setting at a preset value. Bilinear interpolation is used to provide the values of the camera parameters for those lens settings where no observations are taken. The adaptive strategy requires the monofocal camera calibration only for the lens settings where the interpolated camera parameters are not accurate enough, and is hence referred to as the calibration-on-demand method. Our experiments show that the proposed calibration-on-demand method can provide accurate camera parameters for all the lens settings of a motorized zoom lens, even though the camera calibration is performed only for a few sampled lens settings. 相似文献
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为了满足自动检测和智能仪表的需要,提出了一种基于余弦基神经网络的传感器特性建模算法,提出了该余弦基神经网络算法的收敛定理,并以铂电阻Pt100为例给出了传感器特性数学模型的建模步骤。计算机仿真结果表明了该算法在传感器特性建模过程中的有效性和优异性能。 相似文献
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《Journal of Computer and System Sciences》2016,82(7):1201-1222
Linear extended multi bottom-up tree transducers are presented in the framework of synchronous grammars, in which the input and the output tree develop in parallel by rewriting linked nonterminals (or states). These links are typically transient and disappear once the linked nonterminals are rewritten. They are promoted to primary objects here, preserved in the semantics, and carefully studied. It is demonstrated that the links computed during the derivation of an input and output tree pair are hierarchically organized and that the distance between (input and output) link targets is bounded. Based on these properties, two linking theorems are developed that postulate the existence of certain natural links in each derivation for a given input and output tree pair. These linking theorems allow easy, high-level proofs that certain tree translations cannot be implemented by (compositions of) linear extended multi bottom-up tree transducers. 相似文献
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接收信号在压电换能器压电层中的多次反射及波形转换对超声检测的灵敏度和分辨率有重要影响,如何优化阻尼结构与材料参数是提高压电换能器接收性能的关键之一。本文用ANSYS有限元软件中的力-电耦合瞬态模拟方法,研究了压电直探头中阻尼结构的几何尺寸及声阻抗对其瞬态响应的影响,得到了压电换能器中不同时刻的弹性波场、电场分布以及输出电压响应曲线,揭示了换能器瞬态响应产生的多次反射波对其检测灵敏度和分辨率的影响。研究结果表明:通过改进的阻尼结构与材料参数对消减接收信号的多次反射,缩短余振时间具有明显的作用,也可以大大降低换能器的研发周期和成本。 相似文献