Integrating sphere detector, spectral responsivity calibration device and calibration method

By employing a hollow sphere with a diffuse reflection coating and multiple photodetectors within it, the problems of structural complexity and poor uniformity are solved, resulting in higher uniformity of light field detection and a wider range of reflected light detection.

CN122306221APending Publication Date: 2026-06-30NATIONAL INSTITUTE OF METROLOGY CHINA
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Patent Information

Application Number
CN202610483141.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-13
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing integrating sphere detectors have complex structures, poor uniformity, and uneven light field detection. Furthermore, the baffle design introduces light loss.

Method used

The design employs a hollow sphere with a diffuse reflection coating and multiple photodetectors. The incident direction of the light beam is deviated from the center of the sphere, and the light exits are evenly distributed, ensuring that the light beam is received by the photodetectors after multiple diffuse reflections, thus avoiding direct light loss.

Benefits of technology

It improves the uniformity of the integrating sphere detector and the comprehensiveness of light field detection, reduces the non-uniformity caused by insufficient sampling of local light, and has a simple structure that effectively improves the uniformity of the detector.

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Abstract

The invention relates to the technical field of photoelectric detection, and provides an integrating sphere detector, a spectral responsivity calibration device and a calibration method. The integrating sphere detector comprises a hollow sphere and a plurality of photoelectric detectors; the hollow sphere is provided with a spherical cavity, a light inlet and a plurality of light outlets, a diffuse reflection coating is arranged on the inner wall of the spherical cavity, the light inlet is formed in one side of a first reference surface passing through the sphere center of the spherical cavity, the light outlets are uniformly distributed in a second reference surface along the circumference, and the second reference surface is arranged in parallel on one side, deviating from the light inlet, of a third reference surface passing through the sphere center; the third reference surface is vertical to the first reference surface; the plurality of photoelectric detectors and the plurality of light outlets are arranged in a one-to-one correspondence manner; the light beam enters the spherical cavity through the light inlet, the incidence direction of the light beam deviates from the sphere center, and the light beam enters the inner wall of the spherical cavity on the side, deviating from the light inlet, of the second datum plane. The integrating sphere detector provided by the invention is simple in structure and good in uniformity, and facilitates accurate calibration of the spectral responsivity of 1200-2300 nm.
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