可见/近红外实时成像光谱仪控制系统设计

吴长坤; 张为; 郝亚喆

doi:10.37188/CO.2021-0119

可见/近红外实时成像光谱仪控制系统设计

doi: 10.37188/CO.2021-0119

cstr: 32171.14.CO.2021-0119

天津大学微电子学院, 天津 300072

基金项目: 光电信息控制和安全技术重点实验室资助项目（No. JCKY2019210C053）；泉州天津大学集成电路及人工智能研究院开放研究基金项目

详细信息

作者简介:
吴长坤（1991—），男，山东东营人，博士研究生，2013年、2016年于天津工业大学分别获得学士、硕士学位，主要从事光学控制系统设计、图像压缩及高速串行通信接口的VLSI实现等方面的研究。E-mail：tjuwuck@tju.edu.cn

张　为（1975—），男，陕西西安人，博士，教授，博士生导师，1997年、2000年、2002年于天津大学分别获得学士、硕士、博士学位，主要从事光电目标探测与跟踪、数字信号处理VLSI与通信系统设计、计算机视觉和图像处理等方面的研究。E-mail：tjuzhangwei@tju.edu.cn

郝亚喆（1997—），女，河北邯郸人，硕士研究生，2019年于东北大学获得学士学位，主要从事图像压缩关键模块硬件优化及硬件加速方面的研究。E-mail：haoyazhe@tju.edu.cn

中图分类号: TN47
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出版历程
- 收稿日期: 2021-06-04
- 修回日期: 2021-07-13
- 网络出版日期: 2021-08-16
- 刊出日期: 2022-03-21

Design of a control system for a visible/near-infrared real-time imaging spectrometer

School of Microelectronics, Tianjin University, Tianjin 300072, China

Funds: Supported by the Key Laboratory of Optoelectronic Information Control and Security Technology (No. JCKY2019210C053); Tianjin University Open Research Foundation of Institute of Integrated Circuits and Artificial Intelligence in Quanzhou

More Information

Corresponding author: tjuwuck@tju.edu.cn

摘要

摘要: 针对高光谱成像需求，设计了一套可见/近红外实时成像光谱仪。光谱仪基于声光可调谐滤波器（Acousto-Optic Tunable Filter , AOTF）分光器件进行设计，光谱带宽为1.3 μm，其中可见光相机工作在400~1000 nm波段，近红外相机工作在1000~1700 nm波段。光谱仪控制系统以现场可编程门阵列（Field Programmable Gate Array, FPGA）为核心处理单元，使用Cameralink接口采集相机数据，使用RS422串口对AOTF进行频率控制，通过AOTF同步信号与相机外触发信号相结合，实现了连续图像与多波长循环采集的一一对应，图像数据最后经过USB3.0接口传输到上位机进行实时显示。经外场测试，光谱仪成像质量良好，系统工作稳定，针对1024×1024分辨率图像，图像实时传输速率最高可达120 frame/s，满足设计要求。在实际工程应用中，该控制系统接口丰富，且可靠性高、灵活性好，具有较强的可扩展性。
- 成像光谱仪 /
- 声光可调谐滤波器 /
- 现场可编程门阵列 /
- 可见/近红外 /
- 系统设计
Abstract: A visible/near-infrared real-time imaging spectrometer is designed for hyperspectral imaging on the basis of an Acousto-Optic Tunable Filter (AOTF). Its operating band range is 1.3 μm, in which the visible light camera works in the 400−1000 nm band and the near-infrared camera works in 1000−1700 nm band. A Field-Programmable Gate Array (FPGA) is used as the core processing unit of the spectrometer control system. The Cameralink interface is used to collect camera data, the AOTF frequency is controlled by the serial port. Through the combination of AOTF synchronization signal and the trigger signal outside the camera, the one-to-one correspondence between a continuous image and multi-wavelength cyclic acquisition is realized. Finally, the image data is transmitted to the upper computer through the USB3.0 interface for real-time display. The field test shows that the imaging quality of the spectrometer is good and the system works stably. For images with a 1024×1024 resolution, the real-time transmission rate of the image can reach up to 120 frame/s, which meets the design requirements. In practical engineering applications, the control system has a rich interface, high reliability, flexible interface and strong expansibility.
- imaging spectrometer /
- Acousto-Optic Tunable Filter (AOTF) /
- Field Programmable Gate Array (FPGA) /
- visible/near-infrared /
- systematic design

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图 1 AOTF原理图

Figure 1. Schematic diagram of the AOTF

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图 2 成像光谱仪结构示意图

Figure 2. Schematic diagram of the imaging spectrometer structure

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图 3 （a）控制系统示意图及（b）控制系统PCB板图

Figure 3. Schematic diagram (a) and PCB drawing (b) of control system

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图 4 光谱仪测试现场

Figure 4. Test-site of the spectrometer

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图 5 可见光相机在不同波段的测试结果

Figure 5. Experimental results of the visible light camera at different wavebands

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图 6 近红外相机在不同波段的测试结果

Figure 6. Experimental results of the near-infrared camera atdifferent wavebands

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