Large field of view refraction-diffraction hybrid solar-blind ultraviolet warning optical system

Abstract

A large-visual-field reflective / diffractive hybrid solar blind ultraviolet alarm optical system belongs to the field of ultraviolet alarming technology. In prior art, a problem of small visual field exists. The large-visual-field reflective / diffractive hybrid solar blind ultraviolet alarm optical system is characterized in that a positive-focal-power meniscus convex lens, a negative-focal-power biconcave lens with a binary surface, a positive-focal-power biconvex lens, a positive-focal-power biconvex lens with an aspheric surface and a negative-focal-power biconcave lens with an aspheric surface are successively and coaxially arranged in the light transmission direction; a diaphragm is arranged between the positive-focal-power biconvex lens and the positive-focal-power biconvex lens with the aspheric surface; the positive-focal-power meniscus convex lens, the positive-focal-power biconvex lens and the positive-focal-power biconvex lens with the aspheric surface are made of CaF2; and the other lens are made of F-SILICA; the back lens surface of the negative-focal-power biconcave lens with the binary surface is a concave binary diffraction surface; the back lens surface of the positive-focal-power biconvex lens with the aspheric surface is a convex aspheric surface; and the front lens surface of the negative-focal-power biconcave lens with the aspheric surface is a concave aspheric surface; and the large-visual-field reflective / diffractive hybrid solar blind ultraviolet alarm optical system has a working wave band of 240-280nm, a visual field angle of 64 DEG and a relative aperture of 1:3.

Description

technical field [0001] The invention relates to a large field of view refraction-diffraction hybrid solar-blind ultraviolet warning optical system, which belongs to the technical field of ultraviolet warning. Background technique [0002] The working band of the ultraviolet warning system is the sun-blind spectral region of the atmosphere. The solar-blind spectral region refers to the ultraviolet band with a wavelength of 200-300nm. Due to the absorption of ozone, the ultraviolet radiation in this band is very small in the near area. Therefore, when an alarm is issued in this band, the sky is a dark background, with weak interference and false alarms. low rate. [0003] The ultraviolet alarm technology uses the optical system to receive the solar-blind ultraviolet radiation signal from the monitoring target, and converts the optical radiation signal into an electrical signal through the photoelectric conversion system and transmits it to the computer control platform. The c...

AI Technical Summary

Problems solved by technology

However, compared with the readily available UV detector with a pixel size of 13.5μm×13.5μm, the root mean square radius of the spot diagram of the energy spot is much smaller than the pixel size, which causes waste; in addition, the field of view of the optical system Angle is still too small

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