| 无扫描宽范围多波长成像测温技术 |
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| 引用本文： | 孙红胜,梁新刚,马维刚,邱超,杨旺林.无扫描宽范围多波长成像测温技术[J].红外与激光工程,2021,50(5):20200394-1-20200394-7. |
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| 作者姓名： | 孙红胜 梁新刚 马维刚 邱超 杨旺林 |
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| 作者单位： | 1.清华大学 航天航空学院，北京 100093 |
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| 基金项目： | 国防技术基础科研项目（J042011B001） |
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| 摘 要： | 多波长测温是一种先进的辐射测温技术，其原理是假定发射率光谱模型，利用测得的多波长辐射与波长发射率函数关系，求得目标的真温和发射率。多波长成像测温技术通过探测目标的多波长辐射图像信息，反演计算得到目标的温场分布。针对基于彩色CCD的多波长成像测温不能适应非线性光谱发射率模型、测温动态范围较窄等不足，提出了一种基于光阑处非等比例滤色分光的四波长无扫描成像测温方法，有效压缩了波段成像带宽，形成了四个窄波段的成像探测，适用于非线性光谱发射率模型目标宽动态范围温场测量。根据提出的测温方法研制了四波长成像测温仪。测温仪主要由窗口、中性衰减片、四色滤光片、光学物镜镜头、可见/近红外集成传感器、测量控制单元及软件等部分组成。测温仪软件由目标四个波长的单色成像图像，得到目标的真温温场分布。在激光加热条件下对800~2500 ℃目标高温温场进行了试验测试，测量结果与热电偶数据比对表明误差小于1%，具有较高的准确度和较好的动态范围适应性。
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| 关 键 词： | 成像测温 多波长 无扫描 宽范围 |
| 收稿时间： | 2020-10-10 |
Non-scanning wide range multi-wavelength imaging temperature measurement technology |
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| Affiliation: | 1.School of Aerospace, Tsinghua University, Beijing 100093, China2.Beijing Zhenxing Institute of Metrology and Measurement, Beijing 100074, China |
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| Abstract: | Multi-wavelength temperature measurement technology is an advanced radiation temperature measurement technology, which assumes a functional relationship between emissivity and spectrum. The measured multi-wavelength radiation signals and the function relationship between emissivity and spectral is used to obtain the true temperature and emissivity of the target. Multi-wavelength imaging temperature measurement technology detects the multi-wavelength radiation image information of the target and inversely calculates the temperature field distribution of the target. Aiming at the inadequacy of color CCD-based multi-wavelength imaging temperature measurement, such as adaptability of the nonlinear spectral emissivity model, and the narrow dynamic range of temperature measurement, and so on, a four-wavelength non-scanning imaging temperature measurement method based on non-equal ratio filter color splitting at the diaphragm was proposed. This method could effectively compress the band imaging bandwidth to form four narrow band imaging detections, and was suitable for wide dynamic range temperature field measurement of nonlinear spectral emissivity model targets. A four-wavelength imaging thermometer was developed according to the proposed temperature measurement method. The thermometer was mainly composed of a window, a neutral optical attenuator, a four-color filter, an optical objective lens, a visible/near infrared integrated sensor, a measurement control unit, and software. The real temperature distribution of the target was obtained according to the multi-wavelength warming algorithm by the thermometer software. The target high-temperature field (800-2500 ℃) was tested under laser heating conditions. The comparison between the measurement result and the thermocouple data shows that the error is less than 1%, and the method has higher accuracy and better dynamic range adaptability. |
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