一种数字温度传感器的自适应动态补偿研究

Sensors in a Kind of Complex Environment of Self-Adjustment and Repair

摘要: 恒温水浴是粘度仪的核心部件之一，其温度的准确、稳定控制为仪器的关键技术之一。针对数字温度传感器具有较大温度滞后性的缺点，将自适应决策与基于数字滤波方法的动态补偿有机结合，提出了一种数字温度传感器自适应动态补偿方法：利用后向差分法设计的数字滤波器，实现了数字温度传感器频带扩展，完成了其动态补偿，并在动态补偿后面串联一个数字低通滤波器，以防高频噪声干扰；根据数字温度传感器的输出量、数字低通滤波的输出结果以及决策阈值，自适应地选择是否需要动态补偿，避免了补偿过度。以数字温度传感器DS1820为补偿对象的实验表明：这种自适应动态补偿方法大大改善了数字温度传感器的动态性能，响应时问缩短至补偿前的25％~35％。这种温控系统具有加热与制冷功能，控制范围温度的测量范围为−55℃~+125℃，测量精为0.5℃。

Abstract: Constant temperature water-bath is one of core components of the viscometer. The accurate and stable control of temperature is one of the key technologies of the instrument. According to the digital temperature sensor’s disadvantage that it has large temperature hysteresis, the paper organically combines the self-adaptation decision with the dynamic compensation on the basis of the digital filtering method, then puts forward a a digital temperature sensor adaptive dynamic compensation method: Using digital filters designed by the backward difference method to realize the digital temperature sensor band extension and to complete its dynamic compensation; connecting a digital low-pass filter behind the dynamic compensation to avoid the high frequency noise; According to the output of the digital temperature sensor, the output result of the digital low-pass filter and the decision threshold, adaptively choosing whether to need the dynamic compensation to avoid the excessive compensation. The experiment whose compensation object is digital temperature sensor DS1820 shows that the adaptive dynamic compensation method greatly improves the dynamic performance of the digital temperature sensor and that the response time reduces to 25% ~ 35% before the compensation. The temperature control system has the heating and refrigeration function. Measurement range of controlling the temperature is −55℃~+125℃. The measurement precision is 0.5℃.