提出一种新的光栅条纹投影轮廓测量术系统模型，新模型不要求测量系统满足光心连线平行于参考面、成像系统光轴垂直于参考面以及两光轴相交于参考面上等约束条件，只需投射至参考平面的正弦光栅条纹之间相互平行，简化了系统校准过程，有利于现场测量。得到的高度相位映射关系式中，待标定的系数与像点的坐标无关，不需要对每一个像点进行采样，能够减少系统标定所需的时间。实验表明：所提方法使投影装置和成像系统的位置校准过程简单，提高了系统标定的速度，且具有较高的测量精度，能够测量复杂面形的物体，增强了光栅投影三维测量系统的实用性。

A novel model of three-dimensional (3D) shape measurement in fringe projection profilometry (FPP) system is proposed, which doesn′t need to meet the constraints of the link of the two optical centers being parallel to the reference plane, the axis of imaging system being perpendicular to the reference plane and the two axes intersecting on the reference plane. This new model just requires the sinusoidal fringes projected on the reference plane are parallel to each other, so it is easy to implement the adjustment of the FPP system. The undetermined coefficients of the achieved phase-to-height relationship are irrelevant to the coordinates of imaging points. The coefficients can be obtained by means of least square method by sampling a number of points, not every one, so the calibration time is reduced a lot. The experiments demonstrate that the adjustment of the FPP system is simple, so the speed of the system calibration is improved greatly. Moreover, the accuracy of this new 3D measurement system is high, and it can measure the objects with complex surface shapes. Therefore, the novel method enhances the practicability of FPP system.