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首页> 外文期刊>Sensors Journal, IEEE >A Linearization Scheme for Thermistor-Based Sensing in Biomedical Studies
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A Linearization Scheme for Thermistor-Based Sensing in Biomedical Studies

机译：生物医学研究中基于热敏电阻的线性化方案

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摘要

Temperature is one of the basic biophysical quantity monitored for various biomedical systems. Moreover, the variation of temperature is also an important parameter which can be used for estimating other measurands, such as respiratory airflow. This paper proposes a simple operational amplifier-based astable multivibrator circuit for linearization of the characteristic of a negative temperature coefficient thermistor constituting one of the timing resistors. The circuit has been combined with a lookup table to get the unknown temperature value from multivibrator output. Moreover, the same system topology can be used as a linearizer for measurement of respiratory airflow. The performance of the composite system has been verified experimentally. A linearity of approximately ±0.75% has been achieved over 30 °C–110 °C in the case of temperature measurement and ±1.2% for airflow of 10–60 LPM. Better results can also be achieved with the introduction of interpolation algorithms, but at a higher computational and component cost. The compactness of the complete system makes it a good candidate for embedded sensing applications in biomedical systems, such as point-of-care monitoring or in sleep study.
机译：温度是为各种生物医学系统监测的基本生物物理量之一。此外，温度的变化也是一个重要的参数，可用于估计其他测量值，例如呼吸气流。本文提出了一个简单的基于运算放大器的不稳定多谐振荡器电路，用于线性化构成定时电阻器之一的负温度系数热敏电阻的特性。该电路已与查找表结合在一起，以从多谐振荡器输出中获得未知的温度值。此外，相同的系统拓扑可以用作测量呼吸气流的线性化器。复合系统的性能已通过实验验证。在温度测量的情况下，在30°C–110°C范围内实现了大约±0.75％的线性度，在10–60 LPM的气流下实现了±1.2％的线性度。通过引入插值算法也可以实现更好的结果，但是计算和组件成本更高。完整系统的紧凑性使其非常适合用于生物医学系统中的嵌入式传感应用，例如即时医疗点监测或睡眠研究。

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