微型平像场近红外光谱仪的消杂散光设计

设计和研制了结构紧凑、杂散光低的微型平像场近红外光谱仪。在分光系统设计中不采用附加杂散光遮挡装置的常规方法，而是在准直物镜前设置一块直径为8．5mm的平面反射镜，通过调节平面反射镜改变入射光束的空间角，使光束全部被准直镜接收，不再产生旁光，从而有效地消除系统内的杂散光，使仪器整体杂散光水平降低了1．13％。另外，该光谱仪选择线阵CCD作为探测器件，不再设置冷却系统也避免了平面光栅带有扫描旋转机构。由于使用CCD作探测器和新的消杂散光设计方法，该光谱仪实现了微型化。

Suppression of stray light in micro flat-field near-infrared spectrometer

A micro flat-field near-infrared spectrometer with simple structures and lower stray light was designed and developed. By comparing with the conventional method in which a additional installment was taken as a dispersion system to suppress the stray light, this method installed a plane mirror with a diameter of 8.5 mm in front of the collimation mirror to control the incident light. By adjusting the mirror, the angle of the incident light was changed and the light could be received by the collimation mirror totally without bypass light. Using this method, the stray light of the system has been reduced approximately by 1.13%. Furthermore, a linear array CCD detector was chosen as a receiving component to avoid the cooling system and scanning rotary mechanism of plane grating. By using the CCD detector and new stray light suppressing method, the flat-field near-infrared spectrometer has been microminiaturized.