The OSIRIS-REx Thermal Emission Spectrometer (OTES) will provide remote measurements of mineralogy and thermophysical properties of Bennu to map its surface, help select the OSIRIS-REx sampling site, and investigate the Yarkovsky effect. OTES is a Fourier Transform spectrometer covering the spectral range 5.71–100 μm (1750–100cm−1$1750\mbox{--}100~\mbox{cm}^{-1}$) with a spectral sample interval of 8.66cm−1$8.66~\mbox{cm}^{-1}$ and a 6.5-mrad field of view. The OTES telescope is a 15.2-cm diameter Cassegrain telescope that feeds a flat-plate Michelson moving mirror mounted on a linear voice-coil motor assembly. A single uncooled deuterated l-alanine doped triglycine sulfate (DLATGS) pyroelectric detector is used to sample the interferogram every two seconds. Redundant ∼0.855 μm laser diodes are used in a metrology interferometer to provide precise moving mirror control and IR sampling at 772 Hz. The beamsplitter is a 38-mm diameter, 1-mm thick chemical vapor deposited diamond with an antireflection microstructure to minimize surface reflection. An internal calibration cone blackbody target provides radiometric calibration. The radiometric precision in a single spectrum is ≤2.2×10−8Wcm−2sr−1/cm−1$\leq2.2 \times 10^{-8}~\mbox{W}\,\mbox{cm}^{-2}\,\mbox{sr} ^{-1}/\mbox{cm}^{-1}$ between 300 and 1350cm−1$1350~\mbox{cm}^{-1}$. The absolute integrated radiance error is <1%$<1\%$ for scene temperatures ranging from 150 to 380 K. The overall OTES envelope size is 37.5×28.9×52.2cm$37.5 \times 28.9 \times 52.2~\mbox{cm}$, and the mass is 6.27 kg. The power consumption is 10.8 W average. OTES was developed by Arizona State University with Moog Broad Reach developing the electronics. OTES was integrated, tested, and radiometrically calibrated on the Arizona State University campus in Tempe, AZ.

中文翻译：

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OSIRIS-REx 热发射光谱仪 (OTES) 仪器

OSIRIS-REx 热发射光谱仪 (OTES) 将提供 Bennu 矿物学和热物理特性的远程测量，以绘制其表面图，帮助选择 OSIRIS-REx 采样点，并研究 Yarkovsky 效应。OTES 是傅立叶变换光谱仪，光谱范围为 5.71–100 μm (1750–100cm−1$1750\mbox{--}100~\mbox{cm}^{-1}$)，光谱采样间隔为 8.66cm− 1$8.66~\mbox{cm}^{-1}$ 和 6.5-mrad 视野。OTES 望远镜是一个直径为 15.2 厘米的卡塞格林望远镜，它为安装在线性音圈电机组件上的平板迈克尔逊移动镜提供能量。使用单个未冷却的氘化氘化 l-丙氨酸掺杂硫酸三甘氨酸 (DLATGS) 热释电探测器每两秒对干涉图进行采样。冗余～0。855 μm 激光二极管用于计量干涉仪，以提供精确的移动镜控制和 772 Hz 的 IR 采样。分束器是一个直径为 38 毫米、厚度为 1 毫米的化学气相沉积金刚石，具有抗反射微结构以最大限度地减少表面反射。内部校准锥体黑体目标提供辐射校准。单光谱辐射精度≤2.2×10−8Wcm−2sr−1/cm−1$\leq2.2 \times 10^{-8}~\mbox{W}\,\mbox{cm}^{ -2}\,\mbox{sr} ^{-1}/\mbox{cm}^{-1}$ 300 到 1350cm−1$1350~\mbox{cm}^{-1}$。对于 150 到 380 K 的场景温度，绝对积分辐射误差为 <1%$<1\%$。整体 OTES 包络尺寸为 37.5×28.9×52.2cm$37.5 \times 28.9 \times 52.2~\mbox{cm} $，质量为 6.27 kg。平均功耗为 10.8 W。OTES 由亚利桑那州立大学开发，Moog Broad Reach 开发电子产品。OTES 在亚利桑那州坦佩市的亚利桑那州立大学校园内进行了集成、测试和辐射校准。