The research about radiometric technology of two-dimensional rotary table based on image gray level

Xiangyao Xue,Ning Li,Chunxiang Liu,Wenbao Zhang,Jian Qiao

doi:10.1186/s13640-019-0413-z

Abstract

It is difficult to measure infrared radiation quantitatively for fast dynamic targets such as aircraft and missile. At present, there are many problems such as low measurement accuracy, feedback delay, and complex measurement system. In this paper, a radiation measurement scheme based on image grayscale is proposed. The scheme adopts a two-dimensional turntable structure, which can measure the radiation quantity rapidly and accurately. Based on the image method, this method is used to calibrate the gray value of the target point and compare it with that of the absolute standard radiator, so as to obtain the radiation value of the target indirectly. The key of this method is to establish an accurate radiation measurement model. The proposed model based on dynamic calibration is about 50% more accurate than the traditional model. The final measurement accuracy of this model is 75%. Through the infrared radiation measurement of specific dynamic objects in two-dimensional space, it is found that the dynamic calibration model based on this measurement method has higher measurement precision.

Highlights

Traditional infrared radiation measurement mainly includes two kinds, one is direct measurement based on temperature and wavelength, the other is indirect measurement based on image
This paper presents a method for indirect infrared radiation measurement of targets in half-space field of view
When IT = 2 ms is shown in Table 9, the inversion results of MODTRAN atmospheric transmittance and modified atmospheric transmittance are used. It can be seen from the results of the measurement based on image grayscale calibration model of 2D turntable infrared radiation measurement inversion to correction of measurements, the inversion error as the measuring distance is magnified by the increasing trend, but the correction of the model through the inversion error is significantly lower, you can think of model calibration on the infrared radiation calibration of measuring device with high precision

Summary

Introduction

Traditional infrared radiation measurement mainly includes two kinds, one is direct measurement based on temperature and wavelength, the other is indirect measurement based on image. Change the operating temperature of the radiation source, obtain multiple sets of input radiance and corresponding output values, and perform linear fitting according to Eq (5) to obtain the response degree of the infrared measuring equipment at the wavelength rλ0. 3.1 Conditions and methods for establishing the radiation measurement model Indirect-type infrared radiation calibration equipment including high-temperature chamber gray body, low-temperature diffuse gray body, parallel light tube, infrared radiometer, and calibration data processing equipment such as computer, used in the infrared measurement equipment in the laboratory radiation calibration, determine the infrared radiation of input and output signal of the measuring device, the radiation response of the relationship between the radiation. Using the infrared radiation response of measurement equipment, calibration after atmospheric transmittance LR*R and Cheng radiation, the gray value is measured by the target infrared radiation characteristics of inverse calculation target aircraft, such as radial brightness and radiant intensity.

The test methods and procedures The test procedure is as follows

Findings

Conclusion