焦点はずし

defocus

[目次：理論(電子の散乱／回折／結像)]

TEM像の観察において、フレネル縞を観察する場合や格子像、結晶構造像を得るときに対物レンズの焦点をずらすこと。

In TEM image observation, the focus of the objective lens is shifted for observing Fresnel fringes or for taking a lattice image or a structure image. This focus shift is called "defocus."

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