The Experts below are selected from a list of 63507 Experts worldwide ranked by ideXlab platform
Xianbin Fu - One of the best experts on this subject based on the ideXlab platform.
-
a method for reducing the influence of measuring distance on infrared thermal imager temperature Measurement Accuracy
Applied Thermal Engineering, 2016Co-Authors: Yucun Zhang, Yiming Chen, Xianbin FuAbstract:Abstract In order to improve the temperature Measurement Accuracy of infrared thermal imager, aiming at the influence of measuring distance on Measurement Accuracy, a method for reducing the influence of measuring distance is proposed in this paper. First, the three aspects influence principles containing angular field of infrared thermal imager, the contrast between tested object temperature and environmental temperature, and the atmospheric transmittances caused by measuring distance are analyzed. Second, based on the influence principle of measuring distance on Measurement Accuracy, three methods for reducing the influence on above three aspects are proposed, respectively. Theory formula of reducing the influence on above three aspects at the same time on infrared thermal imager Measurement Accuracy is obtained. Finally, in order to verify the feasibility of this theory formula, an experiment about a blackbody in different distance is done. Then, the measured temperature of blackbody is compared with calculated temperature after using the formula proposed in this paper. The experiment results show that this method can reduce the influence of measuring distance on infrared thermal imager temperature Measurement Accuracy effectively.
Dongsheng Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Lens distortion elimination for improving Measurement Accuracy of fringe projection profilometry
Optics and Lasers in Engineering, 2016Co-Authors: Kai Li, Jingjie Bu, Dongsheng ZhangAbstract:Fringe projection profilometry (FPP) is a powerful method for three-dimensional (3D) shape Measurement. However, the Measurement Accuracy of the existing FPP is often hindered by the distortion of the lens used in FPP. In this paper, a simple and efficient method is presented to overcome this problem. First, the FPP system is calibrated as a stereovision system. Then, the camera lens distortion is eliminated by correcting the captured images. For the projector lens distortion, distorted fringe patterns are generated according to the lens distortion model. With these distorted fringe patterns, the projector can project undistorted fringe patterns, which means that the projector lens distortion is eliminated. Experimental results show that the proposed method can successfully eliminate the lens distortions of FPP and therefore improves its Measurement Accuracy.
Yucun Zhang - One of the best experts on this subject based on the ideXlab platform.
-
a method for reducing the influence of measuring distance on infrared thermal imager temperature Measurement Accuracy
Applied Thermal Engineering, 2016Co-Authors: Yucun Zhang, Yiming Chen, Xianbin FuAbstract:Abstract In order to improve the temperature Measurement Accuracy of infrared thermal imager, aiming at the influence of measuring distance on Measurement Accuracy, a method for reducing the influence of measuring distance is proposed in this paper. First, the three aspects influence principles containing angular field of infrared thermal imager, the contrast between tested object temperature and environmental temperature, and the atmospheric transmittances caused by measuring distance are analyzed. Second, based on the influence principle of measuring distance on Measurement Accuracy, three methods for reducing the influence on above three aspects are proposed, respectively. Theory formula of reducing the influence on above three aspects at the same time on infrared thermal imager Measurement Accuracy is obtained. Finally, in order to verify the feasibility of this theory formula, an experiment about a blackbody in different distance is done. Then, the measured temperature of blackbody is compared with calculated temperature after using the formula proposed in this paper. The experiment results show that this method can reduce the influence of measuring distance on infrared thermal imager temperature Measurement Accuracy effectively.
Yeng Chai Soh - One of the best experts on this subject based on the ideXlab platform.
-
Improved Measurement Accuracy of the quadrant detector through improvement of linearity index
Applied Physics Letters, 2010Co-Authors: Song Cui, Yeng Chai SohAbstract:This paper presents a set of formulae for estimating the beam position projected on a quadrant detector (QD). Our new formulae are designed through a systematic procedure to improve the Measurement Accuracy of the QD. It can be applied to different beam profiles. It is shown in simulations that our new formulae have achieved a much better Measurement Accuracy. It is also shown through experimental study that our approach is robust and able to achieve very good performance in practice.
Kai Li - One of the best experts on this subject based on the ideXlab platform.
-
Lens distortion elimination for improving Measurement Accuracy of fringe projection profilometry
Optics and Lasers in Engineering, 2016Co-Authors: Kai Li, Jingjie Bu, Dongsheng ZhangAbstract:Fringe projection profilometry (FPP) is a powerful method for three-dimensional (3D) shape Measurement. However, the Measurement Accuracy of the existing FPP is often hindered by the distortion of the lens used in FPP. In this paper, a simple and efficient method is presented to overcome this problem. First, the FPP system is calibrated as a stereovision system. Then, the camera lens distortion is eliminated by correcting the captured images. For the projector lens distortion, distorted fringe patterns are generated according to the lens distortion model. With these distorted fringe patterns, the projector can project undistorted fringe patterns, which means that the projector lens distortion is eliminated. Experimental results show that the proposed method can successfully eliminate the lens distortions of FPP and therefore improves its Measurement Accuracy.
