A new implemented scheme on Pt100 USB thermoscope is introduced. The adopted signal recuperated circuit meliorated the nonlinearity of Pt100, and the optimum Fit Polynomial on temperature is educed by MATLAB. Combined USB with virtual instrument technique, the sampling signal is transferred, processed and displayed. The design, characteristic of its high temperature precision, convenience and better interface, is fit for situations requiring high temperature precision.

Virtual instrument is an advanced technique for electronic measurement and computer test and control. It has become quite popular in developed countries nowadays, while the traditional instruments are almost totally separate from computers in our country. A new sensor test platform based on the theory of detection technology was presented, which also used the virtual instrument technology. The hardware structure, the detailed design of the sensor modules and the interface built on LabVIEW8.20 were introduced.

Based on the study of WSN and ZigBee protocol, a new design scheme of intrusion detective system on active infrared based on ZigBee technology is put forward. Recurring to the advantages of Short-distance Wireless communication, RF chip MFR24J40 of microchip company is introduced in the scheme. And real-time detection and alarm of inbreaking objects is achieved, with intrusion detective device on active infrared.