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Atmospheric LIDAR co-alignment sensor: flight model electro-optical characterization campaign

机译：大气LIDAR共对准传感器：飞行模型电光表征运动

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Due to the difficulty in studying the upper layer of the troposphere by using ground-based instrumentation, the conception of a space-orbit atmospheric LIDAR (ATLID) becomes necessary. ATLID born in the ESA's EarthCare Programme framework as one of its payloads, being the first instrument of this kind that will be in the Space. ATLID will provide vertical profiles of aerosols and thin clouds, separating the relative contribution of aerosol and molecular scattering to know aerosol optical depth. It operates at a wavelength of 355 nm and has a high spectral resolution receiver and depolarization channel with a vertical resolution up to 100m from ground to an altitude of 20 km and, and up to 500m from 20km to 40km. ATLID measurements will be done from a sun-synchronous orbit at 393 km altitude, and an alignment (co-alignment) sensor (CAS) is revealed as crucial due to the way in which LIDAR analyses the troposphere. As in previous models, INTA has been in charge of part of the ATLID instrument co-alignment sensor (ATLID-CAS) electro-optical characterization campaign. CAS includes a set of optical elements to take part of the useful signal, to direct it onto the memory CCD matrix (MCCD) used for the co-alignment determination, and to focus the selected signal on the MCCD. Several tests have been carried out for a proper electro-optical characterization: CAS line of sight (LoS) determination and stability, point spread function (PSF), absolute response (AbsRes), pixel response non uniformity (PRNU), response linearity (ResLin) and spectral response. In the following lines, a resume of the flight model electro-optical characterization campaign is reported on. In fact, results concerning the protoflight model (CAS PFM) will be summarized. PFM requires flight-level characterization, so most of the previously mentioned tests must be carried out under simulated working conditions, i.e., the vacuum level (around 10_5 mbar) and temperature range (between 50°C and -30°C) that are expected during ATLID Space operation.
机译：由于使用地面仪器难以研究对流层的上层，因此有必要提出空间轨道大气激光雷达（ATLID）的概念。 ATLID诞生于ESA的EarthCare Program框架中，是其有效载荷之一，它是首个进入太空的此类仪器。 ATLID将提供气溶胶和薄云的垂直剖面，将气溶胶的相对贡献和分子散射分开，以了解气溶胶的光学深度。它的工作波长为355 nm，并具有高光谱分辨率的接收器和去极化通道，其垂直分辨率从地面到20 km的高度可达100 m，从20 km到40 km的垂直分辨率可达500 m。 ATLID测量将在393 km高度的太阳同步轨道上进行，由于LIDAR分析对流层的方式，对准（共对准）传感器（CAS）被认为是至关重要的。与以前的模型一样，INTA负责ATLID仪器共对准传感器（ATLID-CAS）电光学表征活动的一部分。 CAS包括一组光学元件，以吸收有用信号的一部分，将其引导到用于共对准确定的内存CCD矩阵（MCCD）上，并将选定的信号聚焦在MCCD上。为了正确地进行电光表征，已经进行了一些测试：CAS视线（LoS）确定和稳定性，点扩展函数（PSF），绝对响应（AbsRes），像素响应非均匀性（PRNU），响应线性（ResLin） ）和光谱响应。在以下几行中，报告了飞行模型电光表征活动的简历。实际上，将总结有关原型飞行模型（CAS PFM）的结果。 PFM需要对飞行高度进行表征，因此，大多数上述测试必须在模拟工作条件下进行，即预期的真空度（约10_5 mbar）和温度范围（介于50°C至-30°C之间）在ATLID Space操作期间。

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