Method for measuring optical transfer function of U-shaped folded thermal imager

The invention provides a method for measuring the optical transfer function of a U-shaped folded thermal imager, belongs to the field of photoelectric imaging, and particularly relates to an optical transfer function system for measuring the infrared thermal imager with an optical shaft folded 180 degrees. The method includes the steps of matching the U-shaped folded thermal imager with an infrared transfer system, then bringing the imaging surface of the thermal imager out to a corresponding position, and measuring the optical transfer function of the thermal imager through an MTF measuring instrument. The method can solve the problem that the MTF measuring instrument cannot be used for measuring the whole machine of the infrared thermal imager with a U-shaped folded structure. 用于测量U型折转热像仪光学传递函数的方法，属于光电成像领域，尤其涉及一种测量光轴折转180度红外热像仪的光学传递函数系统。本发明的方法是将U型折转热像仪通过另一个红外转接系统，与U型折转热像仪匹配后，将热像仪成像面引出至相应位置，并通过MTF测量仪测量其光学传递函数。本发明的方法可以解决MTF测量仪无法测量具有U型折转结构的红外热像仪整机的问题。