Research Of Prompt Function And Temperature Display Function For Rod Type Electronic Thermometer On-line Verification System

Through the investigation for manufacturer,it produces over 10 million electronic thermometers every year,so it is important to verificate the quality of batch electronic thermometers.Depend on verification regulation,the verification content includes: voice prompt function,temperature display function.At present,both domestic and foreign enterprises have developed some system for detecting the function of temperature display.However,the above systems are not meet the efficiency and function requirements,and the manufacturers still verify the electronic thermometers by labor,which has the shortcomings of heavy labor intensity,inevitable personal error,etc.In view of this problem,the thesis proposes concrete device and method,the research work is written as follows:(1)Aim at the problem of batch electronic thermometers verification,design verification system software host computer,which is matching with electronic thermometer motion control system.Use Modbus protocol to connect computers?programmable controllers and sound detection device by peer to peer communication.Functional design parts include prompt function detection module and temperature display function detection module.Timing schedule design parts include the coordination between every module and electronic thermometer motion control system.Experimental results show that,the PC software can connect to each module well.(2)Aim at the problem of voice prompt function detection,propose device and way which is used in sound detection for rod type electronic thermometer On-line verification.Use audio detection module,filter amplifier to collecte sound signals and use bandpass filtering.Compile spectrum computing algorithm based on FFT algorithm.By verificating open sound,the device achieves online verification for voice prompt function.Experimental results show that,the right recognition rate is more than 95% when ambient noise intensity is no more than 80 dB,and the batch detection velocity is more than 0.318 electronic thermometer every second.(3)Aim at the problem of temperature display function detection,design water thermostat temperature measurement module and image processing module.Design electronic thermometer loading station to simulate batch electronic thermometer verification process.Use improved Sobel operator to extract readings border,use least square method to fit the relationship between threshold and eigenvalue,build binaryzation adaptive threshold algorithm to recognize the reading,compare the reading with the temperature value of water thermostat to achieve temperature display function automatic detection.Experimental results show that,the temperature fluctuation of water thermostat is satisfied with the requirements,the correct recognition rate of readings is more than 95%,and the batch detection velocity is more than 0.316 electronic thermometer every second.This thesis can improve verification function,ensure the speed and quality of verification and improve automation degree.