Infrared Thermal Imaging Experimental System Based On Virtual Instrument Technology

Infrared radiation is a phenomenon that exists everywhere in nature.By acquiring the energy radiated from objects in nature,the characteristics,information,and even the internal structure of the object to be measured can be obtained.Because it is suitable for many harsh environments(such as rain,snow,smog,etc.),therefore,infrared detection technology has been widely used in civil and military fields,and is still developing.In recent years,among various infrared sensors,the microbolometer has developed most rapidly and has attracted the most attention.It has the characteristics of high cost performance,low power consumption,and with no mechanical devices,and has become the mainstream imaging device in the current infrared thermal imaging market.In the development process of the infrared detector,the corresponding imaging test experiment system is required to perform verification test and imaging experiment on the chip design result(including digital-analog hybrid circuit,etc.).This paper is based on the microbolometer developed with the partner to design the imaging experimental system.The system can mechanically install and quickly image the packaged microbolometer,and quickly and intuitively evaluate the imaging effect of microbolometer at a lower cost to achieve the purpose of initially evaluating the performance of the device.In this paper,the infrared detector and infrared thermal imaging system are basically expounded.Under the consideration of hardware resources,scheme feasibility,cost performance and other factors,an infrared thermal imaging experimental system is designed.The system consists of two main components: the driving circuit part and the virtual instrument part.In the part of the driving circuit with microbolometer as the core,this paper designs a set of driving signal board and signal adapter board.The driving signal board provides low noise driving voltage to the microbolometer through a variety of low-dropout linear regulators,and through the programmable logic device,provides the correct timing driving signal for the microbolometer,thus ensuring the normal operation of the microbolometer and generating a video signal.The adapter plate completes the transfer input of the drive signal to the microbolometer and the transfer output of the video signal,and at the same time realizes the mechanical installation of the microbolometer in the unwelded condition.In the virtual instrument part,this paper realizes data acquisition through NI data acquisition card and chassis,and realizesimage processing and human-machine interface interaction after acquisition through LabVIEW.In this paper,the analog signal test,timing signal simulation and on-board test of the driver signal board are successfully completed,the signal availability is analyzed,and the signal is debugged to make the microbolometer achieve the best sensitivity.After imaging,the image is processed and optimized by LabVIEW.Finally,the realtime imaging is finally completed,and the effective information can be distinguished by the imaging result.The system can basically meet the experimental test requirements of the partner for the usability of the microbolometer.