In order to evaluate the imaging quality of COD cameras fully and rapidly, the minimum resolvable contrast （MRC） is presented in this paper and the system of measuring MRC is constructed as well, in which two integr...In order to evaluate the imaging quality of COD cameras fully and rapidly, the minimum resolvable contrast （MRC） is presented in this paper and the system of measuring MRC is constructed as well, in which two integrating spheres are proposed to illuminate two sides of the target respectively. The variable contrast can be obtained by regulating the luminance of integrating spheres. Experimental results indicate that the error of measuring luminance is within ±0.3 cd/m^2 ,MRC rises with the increase of the spatial frequency. The experimental results show that the method proposed is an effective apprcach to evaluate the imaaina aualitv of COD cameras.展开更多
By analyzing the deficiencies of the method, a measurement system with the technologies of photoelectricity, laser and digital image processing to synthetically measure these two parameters has been developed. A tradi...By analyzing the deficiencies of the method, a measurement system with the technologies of photoelectricity, laser and digital image processing to synthetically measure these two parameters has been developed. A traditional method to measure the swaying quantity and multi-barrel parallelism of rocket launcher is introduced. Meanwhile, the principle, executive plan and the accuracy analysis are also presented. The photoelectric measurement system has been applied in the swaying quantity and multi-barrel parallelism measurement for Φ122 mm and Φ302 mm rocket launcher. The metrical errors are both 16^th.展开更多
The combustion condition in coal-fired furnaces of the large power station boiler is very complex and the flame emissivity is one of the important combustion parameters. A measurement method of the flame emissivity ba...The combustion condition in coal-fired furnaces of the large power station boiler is very complex and the flame emissivity is one of the important combustion parameters. A measurement method of the flame emissivity based on the blackbody furnace calibration of CCD （Charge Coupled Device） cameras and the color image processing techniques of computer was introduced. The experimental research on the flame emissivity in a 200 MW boiler furnace and a 300 MW boiler furnace was conducted respectively through the several CCD cameras installed at different height in furnace. The measurement results show： the flame emissivity increases with the increase of the unit load, the flame emissivity of the burner areas in furnace is the highest and the flame emissivity decrease with the increase of height of furnace above the burners area.展开更多
Based on microscope and image processing, a new method of auto tool setting for micro milling was presented. Firstly, a realtime image of tool setting area was obtained by microscope and CCD camera, then image process...Based on microscope and image processing, a new method of auto tool setting for micro milling was presented. Firstly, a realtime image of tool setting area was obtained by microscope and CCD camera, then image processing was carried out on this image and the gap between the tool and workpiece was calculated. The gap measurement was sent to motion controlling card to make the tool approach to the surface of workpiece. These steps were repeated until the gap is zero, which means that tool setting was finished. Moreover, a reliability verification test was conducted. Results indicated that the precision of tool setting is satisfactory.展开更多
基金Supported by Science and Technology Research Project of Educa-tion Department of Heilongjiang Province(10051065)
文摘In order to evaluate the imaging quality of COD cameras fully and rapidly, the minimum resolvable contrast （MRC） is presented in this paper and the system of measuring MRC is constructed as well, in which two integrating spheres are proposed to illuminate two sides of the target respectively. The variable contrast can be obtained by regulating the luminance of integrating spheres. Experimental results indicate that the error of measuring luminance is within ±0.3 cd/m^2 ,MRC rises with the increase of the spatial frequency. The experimental results show that the method proposed is an effective apprcach to evaluate the imaaina aualitv of COD cameras.
文摘By analyzing the deficiencies of the method, a measurement system with the technologies of photoelectricity, laser and digital image processing to synthetically measure these two parameters has been developed. A traditional method to measure the swaying quantity and multi-barrel parallelism of rocket launcher is introduced. Meanwhile, the principle, executive plan and the accuracy analysis are also presented. The photoelectric measurement system has been applied in the swaying quantity and multi-barrel parallelism measurement for Φ122 mm and Φ302 mm rocket launcher. The metrical errors are both 16^th.
文摘The combustion condition in coal-fired furnaces of the large power station boiler is very complex and the flame emissivity is one of the important combustion parameters. A measurement method of the flame emissivity based on the blackbody furnace calibration of CCD （Charge Coupled Device） cameras and the color image processing techniques of computer was introduced. The experimental research on the flame emissivity in a 200 MW boiler furnace and a 300 MW boiler furnace was conducted respectively through the several CCD cameras installed at different height in furnace. The measurement results show： the flame emissivity increases with the increase of the unit load, the flame emissivity of the burner areas in furnace is the highest and the flame emissivity decrease with the increase of height of furnace above the burners area.
基金Supported by National Natural Science Foundation of China (No. 50935003)
文摘Based on microscope and image processing, a new method of auto tool setting for micro milling was presented. Firstly, a realtime image of tool setting area was obtained by microscope and CCD camera, then image processing was carried out on this image and the gap between the tool and workpiece was calculated. The gap measurement was sent to motion controlling card to make the tool approach to the surface of workpiece. These steps were repeated until the gap is zero, which means that tool setting was finished. Moreover, a reliability verification test was conducted. Results indicated that the precision of tool setting is satisfactory.
