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We explain the orthogonal planes split (OPS) of quaternions based on thearbitrary choice of one or two linearly independent pure unit quaternions$f,g$. Next we systematically generalize the quaternionic Fourier transform(QFT) applied to quaternion fields to conform with the OPS determined by $f,g$,or by only one pure unit quaternion $f$, comment on their geometric meaning,and establish inverse transformations.  Keywords: Clifford geometric algebra, quaternion geometry, quaternion Fouriertransform, inverse Fourier transform, orthogonal planes split

OPS-QFTs: A new type of quaternion Fourier transforms based on the orthogonal planes split with one or two general pure quaternions