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介绍Ａｂｂｅ成像理论和全息术相结合的新方法，它的特点是：利用小尺寸和无初级像差的Ｆｒａｕｎｈｏｆｅｒ全息图记录物函数的频谱，通过调节Ｆｒａｕｎｈｏｆｅｒ衍射零级谱点的中心，使之定位于待测圆的圆心上，通过间接测量像的横向放大率及其偏差测出内孔的椭圆度；用原参考光作再现照明光波，并共同旋转全息图和参考光，使之清楚地成实像在同一圆周上各点处．本装置制成内窥成像系统，可检测直径为５～１００ｃｍ深孔的椭圆度．
This paper introduces a new method combining Abbe imaging theory and holography. It is characterized by using the spectrum of the Fraunhofer hologram with small size and without primary aberration, and locating the center of the Fraunhofer diffraction zero order spectral point The center of the circle to be measured by indirectly measuring the horizontal magnification of the image and its deviation to determine the ovality of the hole; with the original reference light for the reproduction of illumination light waves, and jointly rotate the hologram and reference light to make it clearly into Real like in the same circle at each point. The device is made of endoscopic imaging system, can detect the diameter of 5 ~ 100cm deep hole ovality.