Non-contact temperature measurement based on Wien’s displacement law using a single webcam in the infrared spectrum region
Non-contact temperature measurement based on Wien’s displacement law using a single webcam in the infrared spectrum region
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在红外光谱区域使用单个网络摄像头基于维恩位移定律的非接触式温度测量
DOI：
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发表时间：
2020
期刊：
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通讯作者：
W. Dwandaru
中科院分区：
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作者：
Saparullah;A. Purwanto;R. I. Wisnuwijaya;E. Sari;W. Dwandaru
本研究的目的是使用网络摄像头的传感器摄像头设计基于非接触式方法的温度测量系统。被测材料为镍丝，电流为 4.5 A-6.5 A，间隔为 0.5 A。温度测量基于对被测材料（即镍丝）发射的红外 (IR) 电磁波的平均像素值分布的测量。红外波穿过衍射光栅，然后由由红色、绿色和蓝色层组成的传感器相机捕获。温度的计算是通过普朗克分布作为产生维恩位移定律的红外区域中的平均像素值分布的模型来进行的。结果表明，根据维恩位移定律，当镍丝被加热时，最大平均像素值处的红外波长会向更短的波长移动。此外，恢复了维恩常数以用于红色和绿色层的温度计算，这显示了非接触测量系统的最佳模型。然而，温度测量仍然包含系统误差，该误差使计算出的温度与真实温度相比发生变化。通过调整测量系统设置可以减少该系统误差。
The objective of this study is to design a temperature measurement system based on a non-contact method using a sensor camera from a webcam. The material being measured is nickel wire given an electrical current of 4.5 A–6.5 A with an interval of 0.5 A. The temperature measurement is based upon the measurement of the average pixel value distribution of infrared (IR) electromagnetic waves emitted by the measured material, i.e.: the nickel wire. The IR waves are passed through a diffraction grating and then captured by the sensor camera consisting of red, green, and blue layers. Calculation of the temperature is conducted by way of Planckian distribution as a model for the average pixel value distribution in the IR regions producing Wien’s displacement law. Results show that the IR wavelength at maximum average pixel value shifts to a shorter wavelength as the nickel wire is heated in accordance with Wien’s displacement law. Moreover, the Wien’s constant is recovered for the temperature calculation of the red and green layers, which shows the best model for the non-contact measurement system. However, the temperature measurement still contains a systematic error that shifts the calculated temperature in contrast to the true temperature. This systematic error may be reduced by adjusting the measurement system set-up.