Optical design of a compact imaging spectrometer for planetary mineralogy

Abstract

We present the design of a compact, wide-angle pushbroom imaging spectrometer suitable for exploration of solar system bodies from low orbit. The spectrometer is based on a single detector array with a broadband response that covers the range 400 to 3000 nm and provides a spectral sampling of 10 nm. The telescope has a 24-deg field of view with 600 spatially resolved elements ͑detector pixels͒. A specially designed convex diffraction grating permits optimization of the signal-tonoise ratio through the entire spectral band. Tolerances and design parameters permit the achievement of high uniformity of response through field and wavelength. The spectrometer performance is evaluated in terms of predicted spectral and spatial response functions and from the point of view of minimizing their variation through field and wavelength. The design serves as an example for illustrating the design principles specific to this type of system.

Design and Performance Analysis of an Off-Axis Three-Mirror Telescope for Remote Sensing of Coastal Water

“…반 면에 삼반사경 형태는 간소한 형태로 제작이 가능하며 차폐 가 없는 설계가 가능하기에 높은 MTF 값을 가질 수 있다. 상대적으로 좁은 시야각(4°)을 가지는 단점이 있지만, 연안 의 협소한 갯벌 지형 등을 관측하는 목적에는 충분히 만족할 수 있는 사양이며, 필요시 항공 플랫폼의 운영 고도를 높여 관측 범위를 넓힐 수 있는 바 본 연구에서는 설계 요구조건 을 만족하기 위한 광학계 설계 형식으로 삼반사경 형태를 선 정하였다 [16][17][18][19][20] . (Fig.…”

Dyson spectrometers for high-performance infrared applications

“…Note that while spot diagrams give a qualitative feel for the quality of the image relative to the diffraction point spread function in the design phase, the real measure of performance should be the instrument spectral response function, including diffraction and partial coherence at the slit. [13][14][15] The practical drawback preventing these designs from being usable as shown is the accessibility of the focal plane. Commercial focal planes are packaged in chip carriers that are considerably larger than the active pixel area, increasing the lateral separation required between the slit and dispersed image.…”

Experimental Study of the Optical Transfer Function (Otf) and Spectral Accuracy of the Imaging Hyperspectrometer Based on the Offner Scheme

“…and spectral resolution than other types of imaging spectrometers for the long length of the slit diaphragm and a relatively small focus distance. The classical Offner scheme consists of a spherical dish and aspherical convex gratings [3,12,13]. The level of the geometrical aberrations of this system is low, due to the fact that the optical beam is reflected twice by the main dish of the spectrometer and the basic aberrational distortions is compensated due to the different signs for the different reflections [13].…”