Method for measuring optical transfer function of U-shaped folded thermal imager
An optical transfer function and thermal imager technology, which is applied in the field of optical transfer function systems and can solve problems such as unsuitable optical MTF measurement.
Active Publication Date: 2019-11-05
KUNMING NORTH INFRARED TECH CO LTD
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Problems solved by technology
[0006] There is an existing method of using optical fiber to transfer the imaging surface from one position to another. The input and output of the image are at both ends of the optical fiber, but this method is not suitable for the measurement of optical MTF in practice.
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Embodiment 1
[0030] Embodiment 1: A method for measuring the optical transfer function of a U-shaped folding thermal imager. The method is to pass the U-shaped folding thermal imager through another infrared switching system, and match the U-shaped folding thermal imager with the U-shaped folding thermal imager. The imaging surface of the thermal imager is drawn out to the corresponding position, and its optical transfer function is measured by the MTF measuring instrument.
[0031] Said another infrared switching system, which is arranged along the optical axis from the object side to the image side in order with a first reflector A and a field lens B with positive refractive power, that is, a first lens C, a second reflector D, with The second lens E with positive refractive power, the system diaphragm F, the third lens G with positive refractive power, the fourth lens H with positive refractive power, and the imaging surface I.
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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.
Description
technical field [0001] The invention belongs to the field of photoelectric imaging, in particular to an optical transfer function system for measuring an infrared thermal imager with an optical axis refracted by 180 degrees. Background technique [0002] With the development of science and technology, the volume requirements of infrared thermal imagers in weapon systems are getting higher and higher. In the design of infrared thermal imager, two mirrors are basically used for U-shaped folding, and the optical path is folded to meet the volume requirements of the system. U-shaped folded layout, the light incident from the large objective lens passes through a series of lenses and two mirrors and converges to the detector image surface, and the direction is folded 180 degrees. as attached figure 1 shown. [0003] For the cooled infrared focal plane imaging system, the optical MTF value is the most comprehensive criterion among all optical performance indicators. There are m...
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IPC IPC(8): G01M11/02
CPCG01M11/0292
Inventor 于振龙李晓斌乐丽珠李林于闻王正强张宏坤黄声姜兴平王春兴张林波杨社腾
Owner KUNMING NORTH INFRARED TECH CO LTD