Research On Volume Thermography Based On Optical Fiber Bundle Tomography And Multi-view Vision

Conventional thermograhies utilize the scanning of infrared components or the imaging of infrared plane arrays to acquire the thermal radiation information of local surface of targets, whose information is limited hence the applications being restricted. This paper proposes a compound vision testing approach for target, which is based on optical fiber bundle tomography and infrared multi-view vision. The approach utilizes infrared multi-view vision to reconstitute the spatial coordinates and passband radiation intensity of the boundary points between the optical thick regions and the optical thin regions of the target’s surface. The reconstituted passband radiation intensity distribution of the optical thick regions is reserved; for the optical thin regions, we reconstruct the three-dimensional distributions of inner passb and radiation intensity and temperature based on optical fiber bundle tomography and the theory of information fusion, which combines an algorithm under the limited-view and obstacle conditions with a restriction of the coordinates and passband intensity of the boundary points reconstituted by infrared multi-view vision.This paper’s main works are as follows:1. Utilize infrared multi-view vision to reconstitute the temperature distribution and the coordinates of the optical thick regions and the boundary between optical thin regions and optical thick regions of the target’s surface. Becauese the target surface temperature is related to the piexl value of the thermal infrared image,so according to the image piexl values,we can analyze the temperature distribution of each point.Solving process of the three-dimensional coordinate between optical thick and optical thin regions boundary are as follows:Firstly,calibrate the infrared cameras in order to obtain their internal parameters matrix and external parameters matrix. Then do feature point extraction and matching of the pictures taken by the infrared cameras. Lastly,calculate the space three-dimensional coordinates of the feature points.2.Utilize optical fiber bundle tomography to reconstitute the infrared information of optical thick regions of the target. This paper use 64 way infrared optical fiber coupled with infrared thermopile sensor OTP538 U as the signal acquisition sensor. After that, we designed a signal acquision circuit to amply the signal which is emmited from the study object.Finally,collect the signal by the DSP and transmit it to the computer for data processing.3.Utilize information fusion concept to complete the study of volume thermography. We get the cut-off point between optical thin regions and optical thick regions of the target by infrared multi-view vision.Then,in optical thin regions,we use optical fiber bundle tomography to obtain the inner temperature distribution of the target; in optical thick regions,we use multi-view vision to obtain the surface temperature distribution,at last,accompulish the target’s volume thermography by information fusion theory.