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大锥度整流罩和接近半球的壳体很难从曲率中心检验,因试件所对的角度非常大。要同时检验整个零件就需要F数非常高的检测光学器件。虽然通过依序观察孔径局部表面构成整个零件的镶嵌图像,但这显然不够理想,也不适用于大批量生产。本文叙述一种用于检验广角同心整流罩和壳体的双通零位检验法,它大大减小了光学检测器件所需的F数,在给出理想零位的同时仍可充满全口径,该检验包括与整流罩或壳体保持密切接触的辅助曼金镜,以及利用试件内表面的齐明点。
Large taper fairings and hemispherical shell is difficult to test from the center of curvature, because the specimen is very large angle. To test the entire part requires a very high F detection optics. Although it is obviously not ideal, it is not suitable for mass production by sequentially observing the surface of the aperture to form a mosaic image of the entire part. This paper describes a double-pass null test method for testing wide-angle concentric cowls and housings that greatly reduces the number of F required for optical inspection devices and still fills the full aperture at the same time as the ideal zero position, This test includes an auxiliary Mannich mirror that is in close contact with the cowling or housing and utilizes the same point of light on the inner surface of the test piece.