Ultrathin light incoming port integrating sphere cosine corrector

Abstract

The present invention discloses an ultrathin light incoming port integrating sphere cosine corrector. The corrector comprises a quartz super-hemisphere ball cover, an aluminum alloy metal spherical shell upper hemisphere, an aluminum alloy metal spherical shell lower hemisphere, a polytetrafluoroethylene spherical liner upper hemisphere, a polytetrafluoroethylene spherical liner upper hemisphere lower hemisphere, a light barrier, a light barrier installing support, a light incoming port, an ultrathin sheet metal and a light outgoing port. An integrating sphere is taken as an optical head and has a good non-polarizing effect so as to effectively avoid the polarization influence caused by the field atmosphere environment. The wall thickness of the light incoming port of the integrating sphere is smaller than 1mm, the internal design of the integrating sphere can avoid perpendicular incidence or direct illumination of a one-time reflected light to the light incoming port, and the actual measurement results in the embodiment of the invention shows that the illumination measurement device can shows an ideal cosine response characteristic. The ultrathin light incoming port integrating sphere cosine corrector has wide application prospect in the aspects of the illumination measurement in the optical radiation measurement field and the total solar radiation measurement in the meteorological field.

Description

[0001] Technical field: [0002] The invention belongs to the fields of optical radiation measurement and meteorology, and in particular relates to an ultra-thin light entrance integrating sphere type cosine corrector. [0003] Background technique: [0004] In laboratory illuminance measurements and outdoor solar irradiance measurements, it is often necessary to use a cosine corrector. The cosine characteristic of the cosine corrector is an important factor affecting the accuracy of illuminance measurement. [0005] Currently commonly used cosine corrector forms are: (1) transmission frosted glass made of quartz, float glass and other materials. When in use, install the ground glass as a separate optical head directly in front of the spectrometer or detector light-guiding fiber; (2) Integrating sphere. When in use, the spectrometer or detector light guide fiber is installed on the integrating sphere at the position perpendicular to the light entrance, and a light baffle is u...

AI Technical Summary

Problems solved by technology

[0006] The frosted glass type cosine corrector has high optical efficiency, but the disadvantage is that the cosine characteristic is average, and generally only has excellent cosine characteristics in a limited range of angles, the scope of application is limited, and it is easy to introduce a large cosine error

[0007] The cosine characteristic of the integrating sphere cosine corrector is directly related to the wall thickness of the light entrance of the integrating sphere. If the light entrance is too thick, it will partially block the oblique incident beam and directly affect the angle range of the cosine characteristic; The optical fiber at the light outlet of the integrating sphere will also directly affect the cosine characteristic

Due to limitations such as machining deformation, the wall thickness of the integrating sphere composed of the metal spherical shell at the opening of the integrating sphere and the thickness of the polytetrafluoroethylene material is generally more than 2mm, and it is difficult to further reduce it.

Moreover, the existing integrating sphere cosine corrector has more considerations in shading direct light, but insufficient consideration in the shading of primary reflected light that also affects the cosine characteristic. These factors limit the further improvement of the cosine characteristic of the integrating sphere cosine corrector

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