基于多目标优化的光场多光谱温度反演方法

孙林林; 方华; 施圣贤

doi:10.11729/syltlx20230011

基于多目标优化的光场多光谱温度反演方法

doi: 10.11729/syltlx20230011

孙林林^1,,
方华^{1, 2},
施圣贤^1, ,

1.
上海交通大学，上海　200240
2.
中国航发湖南动力机械研究所，株洲　412000

基金项目: 国家自然科学基金（12172222）

详细信息

作者简介:
孙林林：（1997—），女，贵州遵义人，硕士研究生。研究方向：光场多光谱高温测量。通信地址：上海市闵行区东川路800号上海交通大学机械与动力工程学院三维光场实验室（200240）。E-mail：sunlinlin@sjtu.edu.cn

通讯作者:
E-mail：kirinshi@sjtu.edu.cn

中图分类号: V231.1
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-13
- 修回日期: 2023-03-10
- 录用日期: 2023-03-15
- 网络出版日期: 2023-04-17

Multi-objective optimization method for light-field multi-spectral pyrometer

SUN Linlin^1
,,
FANG Hua^{1, 2},
SHI Shengxian^{1
, ,}

1.
Shanghai Jiao Tong University, Shanghai　200240, China
2.
Aero-Engine Corporation of China, Hunan Aviation Powerplant Research Institute, Zhuzhou　412000, China

摘要

摘要: 多光谱测温是一种应用广泛的非接触式测温方法。针对多光谱高温计分光系统复杂的问题，本文设计了基于光场相机的光场多光谱高温计，用简洁的光学系统即可实现二维高温测量。光场相机可同时记录入射光线的方向和强度，通过在相机主镜头前放置滤波片阵列，光线的方向信息被替换为光谱信息，使得图像传感器可同时获取光线的光谱和强度。在光谱发射率未知的情况下获得被测对象温度，是多光谱数据处理中亟待解决的难题。常用的发射率假设模型法无法广泛应用于各种材料的温度测量。本文提出了一种基于多目标优化的多光谱温度反演方法，无需发射率先验知识即可精确求解被测对象真实温度和光谱发射率。该方法根据辐射方程建立多目标函数，设置发射率约束条件，并采用惩罚函数法求解约束优化问题。黑体炉标定实验结果表明：该方法的测量误差小于1%，表明了所提出的光场多光谱测温硬件设计及温度反演方法的可行性和可靠性。
- 光场成像 /
- 多光谱测温 /
- 多目标优化
Abstract: A light-field multi-spectral pyrometer is designed for two-dimensional, high-temperature measurements. The proposed method is based on an unfocused light-field camera, which can simultaneously record directions and intensities of incident rays. The direction information of rays is substituted by radiation spectrums via placing an array of filters in front of the camera’s main lens, such that the image sensor can simultaneously acquire spectra and intensities of rays. For multi-spectral data processing, how to obtain the accurate target temperature under unknown spectral emissivity is a difficult problem to be solved. A multi-objective optimization method is proposed to obtain the inverse true temperature and spectral emissivity without assuming the emissivity model. In this method, the multi-objective function is established according to the radiation equations. The emissivity constraint conditions are set for the objective function, and the penalty function method is used to solve the optimization problem. The calibration experiment results of the black-body furnace show that the relative error of the light-field multi-spectral pyrometer method is less than 1%, which proves the feasibility and reliability of the proposed design and temperature inversion method.
- light field imaging /
- multi-spectral pyrometer /
- multi-objective optimization

HTML全文

图 1 光场多光谱高温计原理图

Figure 1. Schematic of the light-field multi-spectral pyrometer

下载: 全尺寸图片幻灯片

图 2 光场多光谱成像流程图

Figure 2. Flow chart for light-field multi-spectral pyrometer imaging

下载: 全尺寸图片幻灯片

图 3 黑体炉标定实验图

Figure 3. Black-body furnace calibration experiment

下载: 全尺寸图片幻灯片

图 4 黑体炉的光场多光谱图像

Figure 4. Raw multi-spectral image of Black-body furnace

下载: 全尺寸图片幻灯片

图 5 黑体炉的二维温度误差分布

Figure 5. Two-dimensional temperature error distribution of black-body furnace

下载: 全尺寸图片幻灯片

表 1 光场多光谱高温计参数

Table 1. Parameters of the light-field multi-spectral pyrometer

参数	值
滤波片波长（λ_i ± 10 nm）	470, 500, 530, 575, 620, 670
微透镜阵列像素	800像素 × 600像素
微透镜阵列尺寸	25 mm × 18 mm
单个微透镜尺寸/µm	28
微透镜焦距/µm	510
传感器像素	7915像素 × 5436像素
传感器尺寸	22 mm × 15 mm
像元尺寸/µm	2.8

下载: 导出CSV

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