In the framework of the scientific activities foreseen by the NASA, ASI and INFN agreement for the InSight Mars lander mission (Interior Exploration using Seismic Investigations, Geodesy and Heat Transport), we characterized the optical performance of the LaRRI instrument (Laser RetroReflector for InSight), through two sets of in-air solar-thermo-optical tests carried out at the SCF_Lab (Satellite/lunar/GNSS laser ranging/altimetry and cube/microsat Characterization Facilities Laboratory) of INFN–LNF in Frascati, Italy. The in-air tests consisted of optical and thermal measurements carried out by: (1) varying LaRRI’s bulk temperature (without solar illumination); (2) illuminating LaRRI with a solar spectrum; in both cases, LaRRI was interrogated with a laser at varying incidence angles w.r.t. its surface. This paper describes the tests and their results, which provide a first characterization of LaRRI’s optical and thermal behaviour in approximate Mars surface conditions.

中文翻译：

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InSight 激光后向反射器的光学性能测试

在 NASA、ASI 和 INFN 为洞察号火星着陆器任务（使用地震调查、大地测量和热传输的内部探索）所预见的科学活动的框架内，我们描述了 LaRRI 仪器（洞察号的激光逆反射器）的光学性能，通过在意大利弗拉斯卡蒂 INFN-LNF 的 SCF_Lab（卫星/月球/GNSS 激光测距/测高和立方体/微卫星表征设施实验室）进行的两组空中太阳能热光学测试。空中测试包括通过以下方式进行的光学和热测量：(1) 改变 LaRRI 的整体温度（无太阳光照射）；(2)用太阳光谱照射LaRRI；在这两种情况下，LaRRI 都被激光以不同的入射角对其表面进行询问。