VIS-NIR reflectance spectra collected during low-temperature and near-vacuum sublimation of spherical salty ice particles (67 µm average diameter) produced by freezing droplets of a solution of 5wt.% NaCl

Spherical ice particles are produced by spraying droplets of salt solution (5 wt.% NaCl) into liquid nitrogen with the SPIPA-B setup. A centimeter-thick sample made of these particles is then introduced in the SCITEAS-2 simulation chamber and its slow sublimation at low temperature and in secondary vacuum is followed for several tens of hours by VIS-NIR hyperspectral imaging. The surface temperature of the sample is monitored continuously using a thermopile sensor, which measures the thermal emission in the far infrared.

球形冰粒采用SPIPA-B装置制备：将质量分数为5%的氯化钠（NaCl）盐溶液液滴喷入液氮中。随后，将由该冰粒构成的厘米级厚度样品置入SCITEAS-2模拟舱内，借助可见-近红外（VIS-NIR）高光谱成像技术，对其在低温与二级真空环境下的缓慢升华过程开展长达数十小时的连续监测。样品表面温度通过热电堆传感器实现连续监测，该传感器可测量远红外波段的热辐射。