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Double-edge scanning measurement method for infrared focal plane array (IRFPA) modulation transfer function (MTF) and device thereof

A technology of modulation transfer function and infrared focal plane, which is applied in the direction of testing optical performance, etc., can solve the problems of unsuitable data points, high and low brightness data points, oscillation, and inability to make full use of data points with uniform brightness at both ends of the knife edge, etc., to achieve test efficiency Improvement, high fitting accuracy, and the effect of improving measurement accuracy

Active Publication Date: 2012-10-10
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

This fitting method often causes oscillations on the flat bright or dark edges on the scanning curve. It is only suitable for the data corresponding to the edge of the knife edge, not suitable for the data points a little far away from the edge of the knife edge and the high and low brightness parts. data point
Therefore, polynomial fitting has the disadvantage that it cannot make full use of the data points with uniform brightness at both ends of the knife edge.

Method used

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  • Double-edge scanning measurement method for infrared focal plane array (IRFPA) modulation transfer function (MTF) and device thereof
  • Double-edge scanning measurement method for infrared focal plane array (IRFPA) modulation transfer function (MTF) and device thereof
  • Double-edge scanning measurement method for infrared focal plane array (IRFPA) modulation transfer function (MTF) and device thereof

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[0029] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0030] The invention provides a method for measuring the modulation transfer function of an infrared focal plane array based on double-knife-edge scanning. This method selects two knife-edges as the target, and obtains the knife-edge extension function ESF(x) by scanning the knife-edge, and then derives the knife-edge extension function ESF(x) to obtain the line extension function LSF(x), and finally performs discrete Fourier transform to obtain the MTF . The present invention adopts double-knife-edge scanning mode. Since the differential operation adopted is sensitive to noise, the traditional processing method is to first adopt polynomial fitting to the knife-edge ex...

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Abstract

The invention relates to a double-edge scanning measurement method for an infrared focal plane array (IRFPA) modulation transfer function (MTF) and a special device thereof. The method comprises the following steps of: using double edges with adjustable light pass widths as targets and implementing the scanning of the edges by a double parabolic lens reflective 1:1 imaging optical system and a three-dimensional precision displacement mechanism so as to obtain a tool spread function ESF (x); then performing the derivation on the ESF (x) to obtain a line spread function LSF (x); and finally, performing the discrete fourier transform to obtain the MTF. According to the invention, a double-edge scanning mode and a trinomial fermi function are adopted to carry out fitting, so that the defects of the polynomial fitting are overcome. The method has strong applicability and high measurement accuracy; and three short wave infrared, medium wave infrared and long-wave infrared wavebands can be covered.

Description

technical field [0001] The invention relates to a double-knife-edge scanning measurement method of an infrared focal plane array modulation transfer function and a special device thereof. Background technique [0002] The modulation transfer function (MTF) of an infrared focal plane array (IRFPA) is the ratio of the modulation degree of the IRFPA output signal to the modulation degree of the radiation signal under the modulation radiation of the sinusoidal spatial frequency within the Nyquist frequency range. MTF is a function of spatial frequency. [0003] MTF ( f ) = M o ( f ) M i ( f ) - - - ( ...

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Application Information

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IPC IPC(8): G01M11/02
Inventor 应承平史学舜王恒飞陈坤峰刘红元吴斌
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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