针对太赫兹(THz)光束发散角精密测量问题,以单频连续波太赫兹源为研究对象,搭建了基于圆锥面拟合的太赫兹发散角测量装置。通过研究太赫兹光束的传播模式,分析其在空间上的光强分布特性,提出将太赫兹输出光束在远场范围内视作圆锥曲面,利用太赫兹探测器采集光斑图像,根据图像的边缘点坐标构建圆锥曲面,借助间接平差对边缘点数据做预处理并进行参数迭代与圆锥面拟合计算出光束发散角数值。结果表明,被测100GHz的太赫兹源发散角为2.73°,相对扩展不确定度为3.8%(k=2)。
Abstract
Aiming at the precise measurement of terahertz(THz) beam divergence angle, a terahertz divergence angle measuring facility based on conical surface fitting was constructed based on single-frequency continuous wave terahertz source. By investigating the propagation mode of terahertz beam and analyzing its spatial characteristics of intensity distribution, the terahertz output beam is regarded as the conic surface in the far field range, and the spot image is collected by a terahertz detector, and the conic surface is constructed according to the coordinates of the edge points of the image. By means of indirect adjustment, the data of edge points are preprocessed and parameter iteration and conical surface fitting are used to calculate the divergence angle. The results show that the terahertz source divergence angle of 100GHz is 2.73°, and the relative expanded uncertainty is 3.8% (k=2).
关键词
发散角测量;太赫兹光束;圆锥面拟合;太赫兹探测器 /
不确定度评定
Key words
divergence angle measurement;terahertz beam /
conical surface fitting /
terahertz detector /
uncertainty budget
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基金
浙江省自然科学基金(LY22F050001);浙江省属高校基本科研业务费专项资金(2021YW09);浙江省新苗人才计划(2023R409A044)
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