Optical system of satellite-borne differential absorption spectrometer

Abstract

An optical system of satellite-borne differential absorption spectrometer comprises a relay optical system and an Offner imaging spectrometer system. The relay optical system is composed of a relay reflector, relay lenses and a color separation filter. The Offner imaging spectrometer system is composed of an incident slit, a convex grating, and a concave reflector. The relay optical system uses the color separation filter to split a detection waveband to form four channels, which are focused by four groups of relay lenses to the incident slit of the spectrometer. Light at each waveband enters the spectrometer from the incident slit of the spectrometer, is split by the convex grating, and has the light path turned and focused on a detector. The invention utilizes a relay reflector to turn the light path, and utilizes the color separation filter to split the detection waveband into four channels, to therefore improve the detection resolution of the system, ensure measurement accuracy and realize compact volume of the whole optical system. The Offner imaging spectrometer has excellent imaging spectrum performance and reduced distortion. The invention facilitates miniaturization and weight reduction of the whole system, and is suitable for space technology.

Description

technical field

[0001] The invention belongs to the field of optical measurement methods, in particular to an optical system of a space-borne differential absorption spectrometer that collects and gathers ultraviolet and visible scattered light from the ground surface and sky, and is mainly used in multi-channel differential absorption of space-borne or airborne platforms. The spectrometer detection consists of two parts: the relay optical system and the imaging spectrometer system. Background technique

[0002] There are two main types of optical systems for spaceborne and airborne imaging spectrometers commonly used at home and abroad: dispersion type and Fourier transform type. Among them, the dispersive hyperspectral imager is divided into two types: prism dispersion and grating dispersion. Most of them use the dispersion method, and the grating dispersion type is often used for systems that require high spectral resolution. Generally, imaging spectrometers based on ab...

Examples

Embodiment Construction

[0018] Such as figure 1 , 2As shown in , 3, the relay optical system of the present invention adopts a reflective, color separation film splitting and relay lens group combined system, including a relay optical system and an Offner imaging spectrometer system. The relay optical system includes a field diaphragm 1, a relay mirror 2, a first relay lens 7, a second relay lens 8, a third relay lens 9, a fourth relay lens 10 and a first color separation film 3. The second color separation film 4, the third color separation film 5 and the fourth color separation film 6. The Offner imaging spectrometer system includes a first incident slit 11, a second incident slit 14, a third incident slit 17, a fourth incident slit 20, a first convex grating 13, a second convex grating 16, and a third convex grating 19 , the fourth convex grating 22 , the first concave mirror 12 , the second concave mirror 15 , the third concave mirror 18 , and the fourth concave mirror 21 . A relay reflector 2...

technical field

[0001] The invention belongs to the field of optical measurement methods, in particular to an optical system of a space-borne differential absorption spectrometer that collects and gathers ultraviolet and visible scattered light from the ground surface and sky, and is mainly used in multi-channel differential absorption of space-borne or airborne platforms. The spectrometer detection consists of two parts: the relay optical system and the imaging spectrometer system. Background technique

[0002] There are two main types of optical systems for spaceborne and airborne imaging spectrometers commonly used at home and abroad: dispersion type and Fourier transform type. Among them, the dispersive hyperspectral imager is divided into two types: prism dispersion and grating dispersion. Most of them use the dispersion method, and the grating dispersion type is often used for systems that require high spectral resolution. Generally, imaging spectrometers based on ab...

Examples

Embodiment Construction

[0018] Such as figure 1 , 2As shown in , 3, the relay optical system of the present invention adopts a reflective, color separation film splitting and relay lens group combined system, including a relay optical system and an Offner imaging spectrometer system. The relay optical system includes a field diaphragm 1, a relay mirror 2, a first relay lens 7, a second relay lens 8, a third relay lens 9, a fourth relay lens 10 and a first color separation film 3. The second color separation film 4, the third color separation film 5 and the fourth color separation film 6. The Offner imaging spectrometer system includes a first incident slit 11, a second incident slit 14, a third incident slit 17, a fourth incident slit 20, a first convex grating 13, a second convex grating 16, and a third convex grating 19 , the fourth convex grating 22 , the first concave mirror 12 , the second concave mirror 15 , the third concave mirror 18 , and the fourth concave mirror 21 . A relay reflector 2...

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