溫度感測精度之補償技術研究

所有感測元件都有精度上的誤差問題，而感測器的價格也隨著精度要求而提高，早期有許多技術可提升感測器的精度，可惜大部分的補償技術都以硬體為主，在成本上負擔較重，經濟效益上並不理想，本研究目的在於利用低成本感測器達到提高精度效果。近年來單晶片軟體技術日漸成熟，精度補償技術的應用亦越來越廣泛。我們利用溫度感測器AD590元件製作溫度感應裝置，將裝置輸出訊號放大後，經由SPCE061A單晶片微控制器將類比訊號轉換成數位訊號，並將結果顯示於4字元7段式顯示器上，所測得溫度與精準溫度計進行比較。透過實驗我們可找出溫度精度誤差特性，以誤差特性建立數學模型描述AD590的非線性的特性。藉由線性、二階曲線及三階曲線等方式進行誤差進行補償探討，得出所需補償之參數值放入SPCE061A晶片微控制器進行AD590測量溫度之精度誤差補償，實驗效果驗證可有效地減少溫度精度誤差提高感測器精度。

關鍵字

特性曲線；精度補償；溫度補償

並列摘要

Most of the sensing element has a precision error problem. Sensor accuracy requirements as the price increase. Many of the early technology can enhance the accuracy of sensors, but unfortunately most of the compensation techniques to hardware mainly in the heavy cost burden, cost-effectiveness is not ideal. This study focuses on how to use low-cost sensors for precision correction in order to achieve high-precision results. Components produced using temperature sensor AD590 temperature sensors. The device output signal is amplified by the single-chip microcontroller SPCE061A will convert analog signals into digital signals and display the results on the 4-character 7-segment display. The measured temperature with the thermometer was accurate to compare. Through experiments we find the temperature accuracy error characteristics, error characteristics of a mathematical model to describe the nonlinear characteristics of AD590.By linear, quadratic curve.Third-order curve to explore ways to compensate for the error. Obtained the required parameter values into the compensation of the chip micro-controller SPCE061A AD590 precision of temperature measurement error compensation.The experimental results verify that effectively reduce the temperature improve sensor precision accuracy error.