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Astronomical telescope optical system with wide field of view and wide band

A technology for astronomical telescopes and optical systems, applied in the field of astronomical telescope optical systems and improved total reflection Schmidt optical systems, can solve the problems of high processing and detection costs, inconvenient visual inspection, and bulky volume, and achieve the purpose of convenience Visual, enhance the field of view, the effect of compact optical structure

Inactive Publication Date: 2019-12-06
NANJING ZHONGKE ASTROMOMICAL INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The correction plate of the traditional reflective Schmidt system is located at the center of the spherical mirror. It is an off-axis high-order aspheric surface. Rarely used in mass-produced popular science telescopes

Method used

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  • Astronomical telescope optical system with wide field of view and wide band
  • Astronomical telescope optical system with wide field of view and wide band
  • Astronomical telescope optical system with wide field of view and wide band

Examples

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Embodiment 1

[0038] Example 1, Optical system of large-aperture telescope, reference image 3 : The optical design indicators are as follows:

[0039] Caliber: 1000mm

[0040] Full field of view: 4°

[0041] Focal length: 5100mm

[0042] Image quality: MTF at Nyquist frequency is greater than 0.25

[0043] Working band: 400nm~900nm

[0044] The structure diagram of the 1000mm telescope optical system is as image 3 As shown, Figure 4 This is the MTF curve diagram of the optical system of Example 1. The telescope optical system includes a Schmidt correcting plate 1, a plane folding mirror 2, a spherical mirror 3 and a focal plane 4. Among them, according to the incident direction of the light, the light is incident from left to right, and the light passes through the Schmidt correcting plate 1, the plane folding mirror 2, the spherical mirror 3 and the focal plane 4 in sequence. The Schmidt correction plate is located at the center of the spherical mirror, so that the spherical aberration of the ...

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Abstract

The invention discloses an astronomical telescope optical system with a wide field of view and a wide band. The astronomical telescope optical system comprises a reflective Schmitt correction plate, aplane folding steering mirror, a spherical reflector and a focal plane; light rays orderly pass through the Schmitt correction plate, the plane folding steering mirror and the spherical reflector toreach the focal plane; and the focal plane is located at the back of the plane folding steering mirror. The Schmitt correction plate is located at the center of sphere of the spherical reflector, andthe Schmidt correction plate is a positive-axis high-order aspheric surface. According to the astronomical telescope optical system with the wide field of view and the wide band provided by the invention, the folding steering mirror is inserted between the reflective Schmitt correction plate and the spherical reflector, so that the focal plane is located outside the system, which is convenient forvisual observation, while the length is shortened, so that an optical structure is more compact; and more importantly, the designed reflective Schmidt correction plate belongs to the positive-axis high-order aspheric surface, and in the design phase, the asphericity is controlled within an easy processing detection range, so that the processing cost of a Schmidt system is lower.

Description

Technical field [0001] The invention belongs to the field of optical instruments, in particular to an astronomical telescope optical system with a large field of view, wide band, and low cost, and in particular to an improved total reflection Schmidt optical system. Background technique [0002] Optical astronomical telescopes are one of the important instruments for observing celestial bodies, and low-cost, high-performance astronomical telescopes are currently the hotspot of research and development. [0003] According to the type of objective lens, the telescope optical system can be divided into three categories: refraction system, reflection system and refraction system. The material and processing cost of the refraction system lens with large diameter and large relative aperture are very high, so the price is very expensive. Reflecting telescope optical systems commonly used include Newton system, Cassegrain system, Gregorian system, etc. This kind of reflection system has w...

Claims

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Application Information

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IPC IPC(8): G02B23/02G02B17/06G02B27/00
CPCG02B17/06G02B23/02G02B27/0025
Inventor 董云芬王斌
Owner NANJING ZHONGKE ASTROMOMICAL INSTR
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