구조광 패턴 편향법 기반 대형 집광반사판의 3D 곡률도 및 집광률 측정 방법
Measurement method of 3D curvature and condensation rate of large solar concentrating mirror based on structured light pattern deflectometry
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초록
본 논문에서는 태양 발에 사용되는 형 집반사의 형상측정을 통하여 3D 곡률도, 왜곡도 집률 등을 측정하는 방법을 제안한다. 집반사의 경우 다양한 형태의 왜곡으로 인해 집효율이 감소 할 수 있고, 효율인 집을 하여 곡률과 왜곡 등의 측정 데이터 피드백을 통한 반사의 곡률 최화 작업이 필요하다. 곡률도 집 률 측정은 이 라인 스캔 방식을 통해 정측정이 가능하나 시간이 매우 오래 걸리는 단이 있고 이를 해결하 기 해 다양한 구조 패턴 반사기법들이 지속으로 연구되고 있다. 본 논문에서는 형 집반사의 곡률도 집률 측정을 하여 구조 패턴 편향법(structural light pattern deflectometry : SLPD)을 제안한다. 제안 하는 방법은 빔로젝터-스크린-측정반사-카메라로 측정환경을 구성하고, 평면거울을 이용하여 기하보정 구조 패턴 주소 등록을 수행한다. 그리고 반사에 의해 변형되어 측정된 구조 패턴을 기하보정 결과에 용하여 표 면형상에 한 X, Y축 gradient를 구하고, integration 계산을 통해 3차원 형상을 복원한다. 복원된 3차원 형상 은 이상인 설계모델과 비교를 통해 곡률도, 왜곡도 집률 등의 측정이 가능하다.
Abstract
In this paper, we propose a method to measure 3D curvature, distortion, and light condensation rate by measuring the shape of a large condensing reflector used in solar power generation. In the case of the condensed reflector, the condensing efficiency can be reduced due to various types of distortion. Therefore the curvature optimization operation of the reflector through feedback of measurement data such as curvature and distortion is required for efficient condensing. The curvature and the light collection rate can be measured precisely by the laser line scanning method. However, there are disadvantages that the time is very long, and various structured light pattern reflection techniques are continuously studied to solve this problem. In this paper, we propose structural light pattern deflectometry (SLPD) for the measurement of the curvature and the light collection rate of a large condensed reflector. The proposed method constructs the measurement environment with a beam projector - screen - measurement reflector - camera and performs geometry calibration and registration of structured optical pattern address using a plane mirror. Then, the structural light pattern deformed by the reflector is applied to the geometrical calibration result to obtain the X and Y axis gradients of the surface shape, and the 3D shape is restored by integration calculation. The reconstructed 3D shape can be measured by comparing with the ideal design model, such as curvature, distortion and light-condensing rate.
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