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因为试件所对的角度非常大,大锥度整流罩和接近半球的壳体是很难从曲率中心检验的。越时要检验整个零件就需要非常高 F 数的检测光学器件。虽然通过依序观察孔径局部表面能构成整个零件的镶嵌图象,但这显然不够理想,也不适用于大批生产的情况。本文叙述一种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精全口径。该检验方法要求有同整流罩或壳体保持密切接触的辅肋曼金镜,而且要利用试件内表面的齐明点。
Because of the large angle to which the specimen is intended, large taper fairings and hemispherical shells are difficult to test from the center of curvature. The longer the inspection of an entire part requires the detection of very high F-number optics. Although it is obviously not ideal and can not be applied to mass production by observing the local surface area of the aperture to form the mosaic of the entire part. This paper describes a double-pass null test method for wide-angle concentric cowls and housings that greatly reduces the number of F required for optical inspection devices while still providing the full caliber of the ideal zero position. This test method requires the auxiliary fairing Mannich mirror with the fairing or housing to maintain close contact, but also to take advantage of Qi Ming points of the inner surface of the specimen.