公开(公告)号：US5216484A

公开(公告)日：1993-06-01

申请号：US805341

申请日：1991-12-09

Applicant: Tien-Hsin Chao ,  Li-Jen Cheng Cheng ,  Jeffrey W. Yu ,  James L. Lambert

Inventor： Tien-Hsin Chao ,  Li-Jen Cheng Cheng ,  Jeffrey W. Yu ,  James L. Lambert

IPC: G01J3/12 ,  G01J3/28 ,  G01N21/35

CPC classification number: G01J3/1256 ,  G01J3/2823 ,  G01N21/35 ,  G01N21/3563 ,  G01N21/359

Abstract: An improved AOTF-based imaging spectrometer that has ability to electronically set the bandpass wavelength of an AOTF to any desired value in its wide tuning range, provides significant observational flexibility. This allows observations to be tailored in real-time and enables the spectrometer to address a wide range of objectives and permits real-time modification of the observational parameters, such as in flight or in other situations in which only remote control is possible. Various improvements in optical architecture provide simplified magnification variability, improved image resolution and light throughput efficiency and reduced sensitivity to ambient light. A preferred embodiment employs a camera zoom lens as the input lens. A TeO.sub.2 AOTF and a relay lens are placed at selected distances behind the back focal plane of the input lens, respectively. A charge coupled device (CCD) camera, which comprises a camera, camera zoom lens and a CCD detector is placed at a selected distance behind the relay lens. An RF signal generator is used to drive the AOTF. Two embodiments of the invention are disclosed herein. One operates in the visible/near-infrared domain, in the wavelength range of 0.48 to 0.76 microns. The other operates in the infrared wavelength range of 1.2 to 2.5 microns.

Abstract translation: 一种改进的基于AOTF的成像光谱仪具有将AOTF的带通波长电子设置为其宽调谐范围内任何所需值的能力，提供了显着的观察灵活性。 这样可以实时观察观察结果，并使光谱仪能够处理各种各样的目标，并允许观察参数的实时修改，例如飞行中或只能进行遥控的其他情况。 光学架构的各种改进提供了简化的放大变化，提高了图像分辨率和光通量效率，降低了对环境光的敏感性。 优选实施例采用相机变焦镜头作为输入透镜。 TeO2 AOTF和中继透镜分别放置在输入透镜的后焦平面后面的选定距离处。 将相机，相机变焦镜头和CCD检测器的电荷耦合器件（CCD）照相机放置在中继透镜后面选定的距离处。 使用RF信号发生器来驱动AOTF。 本文公开了本发明的两个实施例。 一个在0.48到0.76微米的波长范围内在可见光/近红外区域工作。 另一个工作在1.2到2.5微米的红外波长范围内。