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首页> 外文期刊>Instrumentation and Measurement, IEEE Transactions on >A Temperature Compensation Circuit for Thermal Flow Sensors Operated in Constant-Temperature-Difference Mode
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A Temperature Compensation Circuit for Thermal Flow Sensors Operated in Constant-Temperature-Difference Mode

机译：用于恒定温差模式下的热流量传感器的温度补偿电路

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摘要

This paper presents a new temperature compensation technique for thermal flow sensors that are operated in a constant-temperature-difference (CTD) mode by means of a simple analog circuit. The resistive heater of a thermal flow sensor is maintained at a constant temperature some tens of Kelvins above fluid temperature with the help of a Wheatstone bridge circuit. In case of a change in media temperature, an adjustment of the heater temperature is necessary; otherwise, the temperature difference falls/rises with respect to the temperature change, and the sensor output signal deviates from its calibration. Temperature compensation can be performed by the use of an additional resistive temperature sensor. The circuit design presented here includes a potentiometer that is capable of changing the resistance of the temperature sensor and its temperature coefficient of resistance (TCR) for an easy adjustment for temperature compensation. This gives the freedom to use any material such as platinum, aluminum, or, in our case, an alloy of tungsten and titanium (WTi) for the temperature sensor, regardless of its resistance value and TCR with respect to the heater of a thermal flow sensor.
机译：本文介绍了一种用于热流量传感器的新型温度补偿技术，该热流量传感器通过简单的模拟电路以恒定温差（CTD）模式工作。在惠斯通电桥电路的帮助下，热流量传感器的电阻加热器保持在比流体温度高几十开氏温度的恒定温度下。如果介质温度发生变化，则需要调整加热器的温度。否则，温差相对于温度变化下降/上升，并且传感器输出信号偏离其校准。可以通过使用附加的电阻温度传感器来执行温度补偿。此处介绍的电路设计包括一个电位计，该电位计能够更改温度传感器的电阻及其电阻温度系数（TCR），以便轻松调节温度补偿。这样就可以自由使用任何材料，例如铂，铝，或者在我们的情况下使用钨和钛的合金（WTi）作为温度传感器，而不管其相对于热流加热器的电阻值和TCR如何。传感器。

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