Method and device for measuring multispectral dynamic modulation transfer function

Abstract

The invention belongs to the field of optical imaging test, more particularly to a method and a device for measuring a multispectral dynamic modulation transfer function, which can be used for a dynamic performance test of a composite photoelectronic imaging system. In the invention, a multispectral knife-edge division target plate is collimated by an collimating system and then imaged in a tested photoelectronic system fixed on a vibrating table, and modulation transfer functions under different conditions can be obtained after a knife-edge image obtained by the tested photoelectronic imaging system is processed by a computer and then calculated to obtain the tested dynamic modulation transfer function. By translating or rotating the multispectral knife-edge division target plate to simulate target motion and using the vibrating table to simulate the vibration of a weapon platform, the tested dynamic modulation transfer function is real and all-sided, can be used for estimating the dynamic performance of the composite photoelectronic imaging system under the actual service condition and has extremely important application prospect.

Description

technical field [0001] The invention belongs to the field of optical imaging testing, relates to a multi-spectral dynamic modulation transfer function measuring method and device, and can be used for dynamic performance testing of photoelectric imaging systems. technical background [0002] The modulation transfer function (MTF) of an optical system is a standard for objectively evaluating the imaging quality of an optical system. It fundamentally overcomes the shortcomings of traditional image quality inspection methods such as star point inspection, resolution, and geometric aberration. The imaging properties of the system play an important role in the evaluation of the imaging quality of the optical system. With the rapid development and application of photoelectric technology, photoelectric imaging and tracking systems have been widely used in various fields of the national economy, especially in the military field. When the photoelectric system is tracking the target, ...

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Problems solved by technology

However, its shortcoming is that the paper only conducts theoretical analysis and numerical simulation of the dynamic modulation transfer function under different vibration forms, and does not actually measure

However, the simulation system used by this method is very complicated, and the same system cannot be used for simulation of vibrations in different frequency ranges, and the dynamic modulation transfer function cannot be measured simply and quickly, so it is not suitable for use in actual measurement

[0007] The above methods are theoretically analyzing or measuring the dynamic transfer function of the target or photoelectric imaging system in the visible light range, but in order to meet the requirements of modern high-tech operations, the photoelectric imaging tracking system has developed from a single sensor to a TV and infrared composite system, so The above methods can no longer meet the latest test requirements, and there is an urgent need for a dynamic modulation transfer function test device for composite optoelectronic imaging systems

These methods only focus on the influence of the target motion or the vibration of the optoelectronic instrument on the modulation transfer function, without comprehensive consideration of the simultaneous action of the two.

However, in the practical application of photoelectric imaging systems, the above two effects always exist at the same time, so the dynamic modulation transfer function obtained before is always incomplete and unreal, which requires a method that can simultaneously simulate target motion and photoelectric imaging Measuring device for dynamic modulation transfer function of system vibration

Aiming at multi-spectral knife-edge delineation, the report of simultaneously realizing dynamic target, dynamic photoelectric imaging system and modulation transfer function measurement of dynamic target and dynamic photoelectric imaging system has not been seen so far.

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