Optimum Design Of On-Line Inspection System Of Wood Moisture Content

In order to accurately measure the moisture content of wood in the kiln drying process,this project designed a multi-purpose on-line detection system of moisture content of wood to increase the accuracy of full-scale detection of moisture content by segment measurement.The main difference between the moisture content detection system and other systems is that it is possible to effectively avoid the distortion caused by mutual interference when the multiplexed signal is collected into the system,can simultaneously detect temperature,humidity and moisture content,and to achieve remote display.The following three aspects of research and design.First of all,according to the status quo of wood moisture content detection system at home and abroad,the advantages and disadvantages of common measurement methods of temperature,humidity and wood moisture content are analyzed and compared.The temperature measurement of this system is determined by thermal resistance Pt1000 sensor,The wood moisture content measured by the resistance method;according to the system used in the balance of water content and wood moisture content measurement method,the first sub-quantitative calibration of the equilibrium moisture content and the equivalent resistance between the two electrodes,wood moisture content and two Correspondence between equivalent resistance between electrodes.Secondly,on the basis of the above analysis,comparison and quantitative calibration,the hardware design and software design are respectively carried out on the data acquisition and processing of on-line moisture content detection system.Because the system to achieve wireless data display,so the system data acquisition and processing part of the GPRS terminal using RS485 bus communication,to achieve the transmission of information between the CPU and the wireless transmitter module,enabling the measurement results can be far away from The job site is displayed anywhere.In order to achieve some control operations based on the detected information,the system also reserves an I/O interface pinout on the circuit board.Finally,according to the functional requirements and design objectives of the system,the circuit schematic and PCB diagram of the acquisition and processing module are drawn and the printed circuit board is fabricated and verified.The experimental platform of the wood moisture content online detection system is set up.