Liu Renqiang

Operation Principle of a Bend Enhanced Curvature Optical Fiber Sensor

A curvature optical fiber sensor is reported in this paper. The curvature measurement sensitivity is improved using bend enhanced method. The operation principle of this intensity modulate macro-bend curvature optical fiber sensor is proposed based on light scattering theory: the bend of sensitive zone brings about mode coupling and leads to the variation of surface scattering loss. The mathematic model of relationship among light loss, bending curvature, surface roughness and parameters of the fibers configuration is also presented

An image processing approach for jigsaw puzzle assembly

Purpose – To develop an image processing approach for jigsaw puzzle assembly.Design/methodology/approach – First, pixels are extracted from the jigsaw puzzle blocks to calculate their rotation angles and centre coordinates. Second, a template matching method is employed to recognise each block and its orientation.Findings – A robot‐based jigsaw puzzle system is established; and an effective image processing approach for assembly is developed.Practical implications – Automatic assembly lines that assemble parts with the same shape, but random position and angle, can employ the jigsaw puzzle assembly method.Originality/value – An effective image processing method for jigsaw puzzle assembly is presented in this paper. The validity of the method is proved by analysis and experiment.

A Space Solar Cell Bonding Robot

A space solar cell bonding robot system which consists of a three-axis Cartesian coordinate’s robot, coating device, bonding device, orientation plate, and control subsystem was studied. A method, which can control the thickness of adhesive layer on the solar cell, was put forward and the mechanism was designed. Another method which can achieve the auto-bonding between thin cover-glass and the space solar cell was studied and realized. It produced no air bubble in the adhesives layer under the condition of no vacuum environment, and ensures the assembly dislocation ⩽0. 1 mm. Compared to the conventional method, it has advantages such as no fragment exists, and no adhesives outflow onto the cover-glass and solar cells.