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WOOD BOARD AUTO CLASSING SYSTEM BASED ON virtual instrumentation technology

WOOD BOARD AUTO CLASSING SYSTEM BASED ON VIRTUAL INSTRUMENTA...

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亚洲精细农业与计算机农业应用联合大会

作者： Weibin Wu 1 2 Tiansheng Hong 1 Shunzhi Guan 1 1 Key Laboratory of Key technology on Agricultural Machine and Equipment (South China Agricultural University) Ministry of Education Guangzhou 510642 China College of Engineering South China Agricultural University Guangzhou 510642 China 2 College of Mechanical and Automotive Engineering South China University of technology 510641 China

A wood board auto-classifying system basing on virtual instrumentation technology has been established. The system hardware is composed of optical probe, computer terminal, capture card, signal/adjustment models and instructions-executing unit. The software adopts the notion of modularization, and is altogether divided into four modules including master operational controls, automatic detections, information processing and miscellaneous functions, displaying page by page. Each is further subdivided into sub-modules, such as data storage, statement display and printing, history review, important parameter amendment （code needed for parameter value）, statistical analysis （maximum, minimum and average, etc.）, help system, user administration and so on. Its operating interface is a design by LabVIEW, the virtual instrumentation software with direct test results displayed on screen. The system applies a sensor with three receivers to detect color of object （wood board）, then output voltage. After conditioning, data acquisition card signal is collected to the PC. By the voltage and the calibration of the relationship between voltage and color stimulus value, computer terminal will calculate the stimulus value, and compared with the set value, then get the chromatic aberration. Finally, according to the size and scope of chromatic aberration divide it into 8 categories, output the corresponding switch control signal to the executing agency. This system can automatically measure wood board chromatism and output order to drive the enforcing unit accordingly, avoiding disadvantage as low accuracy and uneven color because of fatigue, dizziness or subjectiveness, in order to save cost and increase more sorting levels. Applications feature humanization, convenience and high-speed response to the system. The system and high-precision millivoltmeter （0.01mV） measure weak voltage at the same time, choosing forty-five points within 0 to 500mV for comparison, the absolute value of sy

关键词： virtual instrumentation technology Data Acquisition Card Signal Conditioning Chromatism Wood Board Auto Classing

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