Research On Handheld Thickness Measuring Instrument Based On Laser Ranging

China's bamboo resources are abundant,and the rational development and utilization of bamboo building materials can alleviate the contradiction between domestic timber supply and demand,and has important economic,social and environmental benefits.In the processing of bamboo,the bamboo tube needs to be broken open for the bamboo board to be formed.Therefore,the thickness of the bamboo tube used for processing is very important for the production of bamboo board.In order to produce a good bamboo board,the bamboo tube of different thickness must be divided.The thickness of the pick is measured to ensure that different thicknesses of bamboo or bamboo are used for different purposes.However,due to limitations in technology and cost,the thickness of the bamboo tube is heavily dependent on the micrometer,result resulting in low work efficiency,cumbersome operation,and low automation.In view of this subject,the research work of the hand-held thickness measuring instrument for measuring the thickness of the bamboo tube based on the laser ranging principle is carried out.This topic firstly analyzes the characteristics of bamboo material,and puts forward the technical idea of thickness measurement based on laser reflection ranging.The system design is carried out in this technical idea,and the power supply circuit,main control circuit,serial port circuit and wireless communication circuit are determined.,screen display login and other parts of the hardware circuit.The power circuit adopts two low-dropout linear regulator chips to realize two-way DC-DC conversion;the main control circuit leads out five serial ports,which are one-way debugging interface,one-way communication interface and three-way sensor interface;the serial port circcircuit uniformly reserves three-way sensor The interface is connected;the wireless communication circuit adopts a Wi Fi module,is controlled based on the serial port AT command and is independently reset circuit;the display circuit reserves an I2 C connection interface.Then the software is designed.According to the characteristics of the main control chip,combined with the control requirements of the display screen and the sensor,the basic flow of the handheld thickness measuring instrument is determined,and the timing control module is designed according to the basic process.The timing control module performs the entire control flow.Coordinated processing,completes power-on initialization,reads data from the sensor,calls the optimization algorithm for processing,and displays the operation on the display screen.It also verifies that the wireless communication can normally send the JOSN format data for automation by wireless communication test.Then the smooth Kalman filter algorithm for the purpose of anti-shake optimizati optimization is designed.The principle of smooth Kalman filter algorithm with Kalman auto-regressive filtering and smooth correction is determined,and the code is implemented in principle.MATLAB simulation was also performed on the processing effects of Kalman autoregressive filtering and smoothing correction.Finally,the measurement results of the aluminum alloy sheet under the two methods of sensor optimization and system measurement are analyzed and compared by optimizing the comparison test.During the comparative analysis,it is found that the measured value before sensor optimization has a negative value and will have a negative value in the calculation.As the abnormal value is deleted and recalculated,the analysis results show that the smooth Kalman filter algorithm has significant effect on the data processing.The maximum error measured before the algorithm optimization is as high as 28.32% and the average error is up to 13.09%,while the maximum error after optimization is not Above ±2.5%,the average error is less than ±1%;the measurement results of the bamboo tube are analyzed and compared through the production test.The analysis results determine the average of the overall measure-measurement of the system after the data stabilization using the data stabilization stabilization module and the result correction module.The error is less than 1.5%.Through the calculacalculation and analysis of the summary data of the optimized comparison test and the production test,it is concluded that the linearity of the overall measurement of the system is ±0.7% and the sensitivity is 0.9999 with the smooth Kalman filter algorithm.In summary,this project designed and debugged a handheld thickness measuring instrument based on laser ranging,which integrates functions such as thickness measurement,data processing,screen display,and wireless communication.The actual multi-test test proves that the hand-held thickness measuring instrument can realize non-contact measurement,the hand-held measurement error is less than ±2%,effectively reducing the human measurement error,and the overall cost is low,the use is convenient,and the efficiency of the thickness measurement can be effectively provided.Guarantee the quality of the measurement.