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Development of the Displacement Sensor with Multi-point Measurement Function for Laser Cutting Head

Author: WangChangHe
Tutor: ZhangHongZhi
School: Harbin Institute of Technology
Course: Aviation Aerospace Manufacturing Engineering
Keywords: Laser Cutting Capacitive sensor Detection circuit Distance detection The normal vector detection
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


With the wide application of the laser cutting technology , the quality and efficiency of laser cutting is undoubtedly the most attention to two factors . Laser cutting process , in particular the three - dimensional laser cutting , the cutting head and the spacing of the workpiece and the laser beam optical axis and the vertical degree of the surface being processed is the important factors to affect the cutting efficiency and quality , can solve these two problems at the same time the product of yet can not be self-developed . So , can detect laser cutting head and the workpiece distance can detect the workpiece surface methodology vector sensor research has important practical significance and practical value . In this paper, a laser cutting process and sensor performance requirements , laser cutting head displacement sensor with a multi-point measurement functions , and design and test . It is based on the working principle of the variable gap capacitive sensor , the work simultaneously, a plurality of capacitive sensors for detecting the pitch of the cutting head and the workpiece and the workpiece surface normal vector . For laser cutting focus position , the establishment of a mathematical model of the multi-point measurement sensor detection principle , theoretical analysis of the feasibility of multi-point measurement sensor detects the the workpiece surface normal vector ; under actual working conditions , analysis of the impact sensor performance factors as well as the measures taken , and structural design with multi-point measurement sensor laser cutting head . Developed a detection circuit of the sensor according to the performance requirements of the sensor in the present subject . The sensor signal detection circuit is part of the core of the sensor measurement system hardware , this paper describes the circuit design process . The testing results show that the performance of a single capacitive sensor , the detection circuit is able to self-designed to meet job requirements, good performance of a single capacitor sensor . Use of a self-designed multi-point measurement sensor detection circuit, the multi-point measurement sensor , the experimental results show that the sensor does not exist between the mutual interference ; conducted a test on the performance of the distance measurement of the sensor and the normal vector of the workpiece surface measurement performance , verify the feasibility of the multi-point measurement sensor this structure forms .

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