共查询到19条相似文献,搜索用时 78 毫秒
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本文介绍了采用动态补偿技术减小动态测量误差的原理,研究了利用传感器或测试系统的动态设计相应的动态补偿数字滤波器的方法,并讨论了这种数字滤波器的硬件实现,介绍了利用可编程逻辑器件实现的动态补偿数字滤波器。 相似文献
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动态补偿滤波器的一种设计方法 总被引:1,自引:0,他引:1
研究了动态补偿滤波器的设计方法问题,探讨测量噪声对动态测量误差补偿的效果的影响,提出按希望指标设计动态补偿滤波器的方法,以使补偿后的等效系统既具有满足要求的动态性能指标,又对测量噪声具有一定的抑制作用。通过对谐振筒压力传感器设计动态补偿滤波器的实例,证实了本文所提出的设计方法是行之有效的。 相似文献
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针对电化学气体传感器的动态响应延迟问题,设计了一种电化学气体传感器的动态特性测量装置,研究了气体传感器动态特性补偿及应用。为减小电化学气体传感器的动态响应时间,提出了用粒子群优化(PSO)算法对电化学气体传感器逆建模的动态补偿法,获得动态补偿滤波器模型,对电化学气体传感器的响应-恢复时间进行补偿。将补偿方法应用于研制的存储式气体浓度测试系统,测试结果表明该方法有效地改善了传感器的动态响应特性,并在响应时间上提高了3.6倍,恢复时间提高了2.8倍,具有可移植性强、易于实现的特点。 相似文献
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采用一种基于钢球对碰撞的窄脉冲冲击激励装置,结合外差式激光干涉仪对加速度计进行了绝对法冲击校准,分析了该装置所产生波形的特点。利用加速度计的输入输出信号,采用相关二步法对表征加速度计动态特性的数学模型参数进行了辨识,与绝对法振动校准结果的比较说明了加速度计模型以及动态校准的可靠性。最后基于动态校准得到的加速度计模型,设计了数字补偿滤波器,通过对加速度计动态特性的补偿,提高了加速度计的带宽,减小了动态误差。 相似文献
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在测控系统中传感器通常都位于系统的反馈通道.大时间常数的传感器严重地影响着系统的实时调节,为此,对大时间常数的传感器进行在线的实时补偿是十分必要的.本文通过分析,给出了对大时间常数传感器动态特性进行在线实时补偿的算法,该算法根据传感器在当前以及此前若干时刻的测量输出值yk,yk-1,yk-2直接给出现场被测量实际值的估计值xk,从而摆脱了由于大时间常数传感器的惯性给系统的实时调节带来的困难.为了实现对传感器的动态特性进行补偿,文章还给出了对传感器模型进行在线辨识的方法. 相似文献
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为改善运算式电容测微仪的动态特性,扩展其动态测量范围,对影响其动态特性最大的解调滤波器的参数进行优化。以解调滤波器动态特性的理论分析为基础,通过Matlab仿真以及实验确定解调滤波器的优化参数,同时对解调滤波器的动态特性进行实际测试。测试结果表明:优化后,滤波器在0~2 k Hz的工作频率范围内,幅频特性的变化不超过3%,其动态特性较好地满足不失真测试条件的要求,可将电容测微仪的动态测量范围扩展到0~2 k Hz。 相似文献
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基于开关电容电路的模拟滤波器的设计 总被引:2,自引:0,他引:2
文章介绍了开关电容电路的基本结构和工作特性.并通过实例阐述了利用开关电容电路技术可以实现小型化高精度、高稳定性的音频模拟滤波器。 相似文献
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This paper proposes the use of field programmable analog arrays (FPAAs) as adaptive conditioning blocks for ultrasonic sensors. The uncertainty achievable through this technique, in fact, results very sensitive to the measurement conditions, due to the attenuation affecting the echo during its propagation. Indeed, FPAAs emulate analog circuits whose characteristics have to be dynamically tuned according to different operating conditions. Actually, the signal provided by the ultrasonic sensor is properly processed in order to improve the overall measurement accuracy. In this paper, the prototype of a distance meter based on time-of-flight (TOF) measurement is presented in order to evidence the advantages gained by FPAA features in processing the sensor output to compensate echo attenuation and distortion versus target distance. The prototype working is supervised by a digital signal controller (DSC) whose tasks are: 1) driving the ultrasonic transducer; 2) performing the echo acquisition; 3) tuning on the fly the FPAA features; 4) evaluating the TOF; 5) measuring the target distance; and 6) delivering the final result to the end user. This paper is completed by the results achieved in a number of experimental tests allowing interesting considerations to be drawn. In particular, the experiments confirm the prototype reliability and effectiveness also with ultrasonic echoes characterized by very low signal-to-noise ratios. 相似文献
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N. G. Kokodii 《High Temperature》2001,39(5):729-732
A mathematical simulation of the processes occurring in a thermal detector of optical and infrared radiation is used to develop a method for correcting its characteristics. This method makes it possible to reduce considerably the detector time constant. 相似文献
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《IEEE transactions on instrumentation and measurement》1967,16(2):138-142
A method for designing a period-to-analog converter is described. The device accepts input signals of varying frequency and converts the period of the waveform to a time inverse voltage Vi(t). This voltage is sampled at the end of the period, and this information is held over the following interval. The analog derived from the input signal is a voltage proportional to the repetition rate. The approach to generating the time inverse voltage is based on Willer's general method of approximating decaying functions with a sum of exponential functions. The described method has been utilized to develop a device for monitoring physiological signals. Results demonstrating the performance of the instrument are presented. The method is directly applicable to function generation in general and could be of importance for analog computers. 相似文献
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红外可调声光滤光器的设计和特性分析 总被引:2,自引:1,他引:2
根据声光互作用原理,以TeO2晶体为互作用介质,选取互作用长度为28mm,设计制成近红外声光可调滤光器(AOTF),其衍射波长与超声频率存在对应关系。测试结果表明,该器件的工作波长范围为0.9-2.6μm,驱动频率为40-120MHz,光谱分辨力为7.268nm,6.957nm(对应波长分别为1.5μm,2.4μm)。 相似文献
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