以熱線式感測原理中的固定溫度法(CTA)作為檢知風速的主要技術，會因為其方法之電路輸出訊號與當下量測之風速兩者之間並非線性關係且亦無明確之關係式，因此必須先擷取多組輸出訊號與相對應之風速，接著藉由數值分析推導出兩者之間的關係式，而此步驟則稱為校正程序。
本研究將以多段三階仿樣法所推導出的關係式當作風速傳感器的校正模型，並將其以程式語言的方式撰寫於風速傳感器的韌體當中。並利用高階圖控程式所撰寫之風速檢校程式透過MODBUS通訊協定傳輸標準風速值與平均CTA電壓作為校正資料，最後風速傳感器會根據校正資料而自我運算出多段三階仿樣的所有方程式係數。另外所開發程式的另一功能為品質檢驗，根據品質檢驗報表中的量化數值來評定風速傳感器的品質。
經實驗測試結果，以本研究之多段三階仿樣法為CTA風速校正模型時，三種風速量程範圍包括20 m/s、40 m/s及60 m/s其線性誤差皆可控制在± 2 %以內。並以自動化風速檢校程式來提升風速傳感器在生產製造效率及降低人為誤差率。

The constant temperature anemometry (CTA) of hot wire measurement is the primary technique for detecting the wind speed. The relationship between circuit output and detected wind speed is non-linear. Therefore, the necessary step is to capture the multi-output signal & the corresponding wind speed at first in order to derive the relationship between them through a numerical analysis. This process is called as linear Calibration Procedure.
The research employs the multiple curve fitting method to calibrate a CTA-based flow transmitter. Then the firmware is built for the flow transmitter with a calibration model. And the standard wind speed and average CTA voltage value are captured to perform the calibration by a host PC which is transferred by a MODBUS protocol. Finally the flow transmitter can calculate all coefficients of equations with the given data. The developed program has another function that is quality inspection. In the report of quality inspection, the quantitative quality factor is used to determine the quality of a flow transmitter.
From the experimental results, the inaccuracy for three different range of flow meters(20 m/s, 40 m/s and 60 m/s) can be controlled within ±2 % by using the developed multiple curve fitting method for calibration model. In additional, this calibration program may enhance the manufacturing efficiency and reduce the error rate caused by human factors.

[1] Christoph Sosna, Rainer Buchner, and Walter Lang, “A Temperature Compensation Circuit for Thermal Flow Sensors Operated in Constant-Temperature-Difference Mode,” IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 59, NO.6, JUNE, pp. 1715－1721, (2010).
[2] Rômulo Pires Coelho Ferreira, Raimundo Carlos Silvério Freire, and Gurdip Singh Deep, “Performance Evaluation of a Fluid Temperature-Compensated Single Sensor Constant Temperature Anemometer,” IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 52, NO. 5, OCTOBER, pp.1554－1558, (2003).
[3] 關玉蘋，「熱線式風速計線性化校正技術研究」，碩士論文，國立臺灣科技大學自動化及控制研究所，(2012)。
[4] IEC International standard, “IEC 61298-2:Process Measurement and Control Devices － General Methods and Procedures for Evaluating Performance － Part2: Tests under reference conditions,” September 23, pp. 1－27, (2005).
[5] A. Al-Salaymeh, “On the convective heat transfer from circular cylinders with applications to hot-wire anemometry,” Proceedings of the 3rd LASME/WSEAS Int. Conf. on HEAT TRANSFER, THERMAL ENGINEERING AND ENVIRONMENT, Corfu, Greece, August 20-22, pp178－183, (2005).
[6] Ken Okamoto, Tadahiko Ohhashi, Masahiro Asakura, and Kenzo Watanabe, Fellow, IEEE, “A Digital Anemometer,” IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, VOL. 43, NO. 2, APRIL, pp.116－120, (1994).
[7] John G. Webster, MECHANICAL VARIABLES MEASUREMENT －Solid, Fluid, and Thermal, CRC Press, (1999).
[8] G.R. Sarma, “Analysis of constant voltage anemometer circuit,” Proceedings of the 1993 Instrumentation and Measurement Technology Conference, pp.731－736, (1993).
[9] Rui Yi Que, Rong Zhu, Qing Zhen Wei and Zhe Cao, “Temperature compensation for thermal anemometers using temperature sensors independent of flow sensors,” MEASUREMENT SCIENCE AND TECHNOLOGY, Vol.22, No.8, pp.1－5, (2011)
[10] M. A. Kegerise, E. F. Spina, “A comparative study of constant-voltage and constant-temperature hot-wire anemometers－Part I: The static response,” Springer-Verlag, pp.154－164, (2000).
[11] M. A. Kegerise, E. F. Spina, “A comparative study of constant-voltage and constant-temperature hot-wire anemometers－Part II: The dynamic response,” Springer-Verlag, pp.165－177, (2000).
[12] 邱志鵬，「微機電技術應用於熱絲式呼吸流量感測器系統之研發」，碩士論文，國立臺灣大學電機工程學研究所，(2000)。
[13] 吳金戍、郭庭吉，單晶片8051專題製作－使用keil uvision3組合語言，松崗圖書，(2008)。
[14] RS-422 and RS-485 Standards Overview and System Configurations, http://www.ti.com/lit/an/slla070d/slla070d.pdf.
[15] Modbus.Org, http://www.modbus.org/.
[16] Modbus-IDA, “MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b,” Modbus-IDA, December 28, pp.1－51, (2006).
[17] 趙英宏、趙元和，數值分析－Numerical Analysis，五南圖書，(2008)。
[18] L.V. King, “On the Convection of Heat from Small Cylinders in a Stream of Fluid: Determination of the Convection Constants of Small Platinum Wires, with Applications to Hot-Wire Anemometry,” Phil. Trans. Roy. Soc. A214, pp.373－432, (1914).
[19] ST, “STM32F100xx advanced ARM-based 32-bit MCUs,” STMicroelectronics, Doc ID 16188 Rev 4, July, pp.1－675, (2011).
[20] 關玉蘋、蔡明忠、朱仁誠、朱信燁，“風速計感測器自動化品管檢測系統研發，” 2012年智慧自動化產業期刊NO.2， pp.35－45，(2012)。
[21] 蔡明忠、邱瑞慶、關玉蘋、周佳德、朱仁誠、朱信燁，“熱線式風速傳感器自動線性校正系統之研製，” 2013年智慧自動化產業期刊 NO.6， pp.70－83，(2013)。
[22] 惠汝生，LabVIEW 8.X 圖控程式應用，全華圖書，(2006)。