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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Spectral emissivity and temperature of heated surfaces based on spectrometry and digital thermal imaging - Validation with thermocouple temperature measurements
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Spectral emissivity and temperature of heated surfaces based on spectrometry and digital thermal imaging - Validation with thermocouple temperature measurements

机译：基于光谱和数字热成像的热耦合和热电偶温度测量的光谱发射率和温度

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摘要

The spectral emissivity of an object is required to measure its temperature remotely, based on thermal imaging from a high-speed digital camera. However, it is often difficult to obtain the spectral emissivity of objects under transient conditions, as is the case with burning fuels; hence, the accuracy of the temperature measurement is compromised. This manuscript describes a method of temperature measurement of objects with simultaneous use of a spectrometer and a high-speed camera. The method was demonstrated by viewing the bead of an R-type thermocouple heated by a premixed natural gas flame to temperatures in the range of 1450-1530 K, and by comparing such remote temperature measurements with those obtained based on the thermocouple's voltage output. The spectral emissivity of the heated thermocouple was acquired from spectroscopic analysis of its output radiation, in the wavelength range of 500-1000 nm. It was shown that the thermocouple approached graybody behavior at the upper end of this band. It was also shown that spectral emissivity of R-type thermocouple is close to the emissivity of S-type thermocouple, reported in the literature in the wavelength range of 500-700 nm and, also, close to the emissivity of pure platinum. This suggests that the effect of rhodium on the platinum emissivity is negligible. The temperature of the R-type thermocouple was measured at four different flame conditions (by varying the fuel/air equivalence ratio) using the spectrometer and the high-speed camera, and it was compared with the thermocouple temperature measurements. The flame was either steady or unsteady; the latter condition was implemented to evaluate the transient response of the measurements. In both cases, the comparison showed that the results of the three different temperature measurement methods have very high consistency and were within 11 Kin the explored temperature range. Hence, this method is suitable for temperature measurements of objects of varying temperature and emissivity, such as solid fuel particles during their combustion.
机译：基于来自高速数码相机的热成像，需要对象的光谱发射率来远程测量其温度。然而，通常难以在瞬态条件下获得物体的光谱发射率，如燃烧燃料的情况一样;因此，温度测量的准确性受到损害。该稿件描述了一种具有同时使用光谱仪和高速相机的物体的温度测量方法。该方法通过将通过预混合的天然气火焰加热的R型热电偶的珠子对1450-1530k的温度进行了说明的，并通过将这种远程温度测量与基于热电偶电压输出获得的那些进行比较。从其输出辐射的光谱分析中获得加热热电偶的光谱发射率，在500-1000nm的波长范围内。结果表明，热电偶在该频段的上端接近了灰烬行为。还表明R型热电偶的光谱发射率接近S型热电偶的发射率，在500-700nm的波长范围内的文献中报道，也接近纯铂的发射率。这表明铑对铂发射率的影响可忽略不计。使用光谱仪和高速摄像头在四个不同的火焰条件下（通过改变燃料/空气等效比）测量R型热电偶的温度，并将其与热电偶温度测量进行比较。火焰稳定或不稳定;实施后一种条件以评估测量的瞬态响应。在这两种情况下，比较表明，三种不同温度测量方法的结果具有非常高的一致性，并且在探测温度范围内11份。因此，该方法适用于不同温度和发射率的物体的温度测量，例如在其燃烧过程中的固体燃料颗粒。

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