为观测从小行星（162173）Ryugu返回的样品开发与Hayabusa2光学导航照相机（ONC-T）相当的多光谱立体照相机系统
Development of a multispectral stereo-camera system comparable to Hayabusa2 Optical Navigation Camera (ONC-T) for observing samples returned from asteroid (162173) Ryugu
摘要：
隼鸟2号从小行星（162173）Ryugu收集了5.4克样本，并将其带回地球。获得这些样品的多波段图像，其光谱波段与遥感观测所用的光谱波段相当，这对于确定所收集样品的特征和研究样品与整个Ryugu航天器观测结果相比的代表性非常重要。在这项研究中，我们构建了一个多波段显微相机系统，使视觉多光谱成像在390（ul），475（b），550（v），590（Na），700（w），和850 nm（x），和三维（3D）形状重建的单个颗粒样品的立体成像的基础上。成像系统产生4096 x 2160像素的图像，像素分辨率为1.93 μm/pix，视场为7.9 x 4.2 mm。我们的验证测量表明，我们的多光谱成像系统，观察样品的光谱波段与隼鸟2号望远镜光学导航相机（ONC-T）上的光谱波段相当，产生具有3%的相对误差的反射光谱和具有5%的误差的3D模型。这些结果表明，具有三维形状重建能力的多波段成像系统在返回的样品上产生准确的光谱和形状数据。使用该仪器，我们对从小行星上的两个位置获得的两个Ryugu样本（A3和C1盘中的颗粒）进行了多光谱测量。测得的Ryugu样品的平均光谱是平坦的，与Ryugu的全球平均光谱一致。在550 nm波段（v波段）的反射率平均为2.4%，高于用ONC-T观测到的Ryugu的全球平均光谱。这种明显的差异可能是因为返回的颗粒具有更大的镜面反射率。
英文摘要：
Hayabusa2 collected 5.4 g of samples from the asteroid (162173) Ryugu and brought them back to Earth. Obtaining multiband images of these samples with the spectral bands comparable to those used for remote-sensing observations is important for characterizing the collected samples and examining how representative the sample is compared with spacecraft observations of Ryugu as a whole. In this study, we constructed a multiband microscopic camera system that enables both visual multispectral imaging at 390 (ul), 475 (b), 550 (v), 590 (Na), 700 (w), and 850 nm (x), and three-dimensional (3D) shape reconstruction of individual grain samples based on stereo imaging. The imaging system yields the images of 4096 x 2160 pixels with the pixel resolution of 1.93 μm/pix and field of view of 7.9 x 4.2 mm. Our validation measurements demonstrate that our multispectral imaging system, which observes the samples with the spectral bands comparable to those on the telescopic optical navigation camera (ONC-T) on Hayabusa2, yields reflectance spectra with a relative error of 3% and a 3D model with an error of 5%. These results indicate that the multiband imaging system with a 3D shape reconstruction capability yields accurate spectral and shape data on the returned samples. Using this instrument, we conducted multispectral measurements of two Ryugu samples (grains in the dishes A3 and C1) acquired from two locations on the asteroid. The average spectra of the measured Ryugu samples were flat and consistent with the global averaged spectrum of Ryugu. The 550-nm band (v-band) reflectance of the returned grains in the dishes was 2.4% on average, higher than that of the global averaged spectrum of Ryugu observed with ONC-T. This apparent difference could be because the returned grains have greater specular reflectance.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
