In this study, we propose a phase correction method for a type of neutron spin echo spectroscopy, known as modulation of intensity with zero effort using a time-of-flight method (TOF-MIEZE). The phase of the MIEZE signal sensitively varies with the neutron flight path lengths. The geometrical lengths from the sample position to the flat detector plane differ depending on the positions on the detector plane. Integrating the phase-shifted signals may decrease the signal contrast solely through the geometrical path-length deviations. To measure the decrement of contrast accurately, which corresponds to the intermediate scattering function, the position-dependent phase shifts must be corrected. The data correction is performed by shifting the MIEZE signal in time depending on path-length deviations, the MIEZE frequency, and neutron wavelengths. In the calculation of path-length deviations, the sample is assumed to be a point scatterer while a detector inclination is taken into account. We also discuss the relation between the frequency shift of TOF-MIEZE signal and path-length deviation, which is helpful to quantify phase shifts larger than $2\pi$. The presented phase correction method is demonstrated with a 32 × 32 cm${}^2$ area detector for a 200 kHz TOF-MIEZE signal scattered from an elastic sample.

在这项研究中，我们为一种中子自旋回波谱提出了一种相位校正方法，称为使用飞行时间方法 (TOF-MIEZE) 进行零强度调制。MIEZE 信号的相位随中子飞行路径长度而敏感地变化。从样品位置到平面检测器平面的几何长度因检测器平面上的位置而异。对相移信号进行积分可以仅通过几何路径长度偏差来降低信号对比度。为了准确测量与中间散射函数相对应的对比度下降，必须校正位置相关的相移。数据校正是通过根据路径长度偏差、MIEZE 频率和中子波长及时移动 MIEZE 信号来执行的。在计算路径长度偏差时，假设样本是点散射体，同时考虑了检测器的倾斜度。我们还讨论了 TOF-MIEZE 信号的频移与路径长度偏差之间的关系，这有助于量化大于$2\pi$. 所提出的相位校正方法用 32 × 32 cm${}^2$ 用于从弹性样品散射的 200 kHz TOF-MIEZE 信号的区域检测器。