Study On Data Acquiring, Controlling And Preprocessing For Infrared Detector

Infrared technique is used widely in both military field and civilian field as means of finding, detecting and identifying the targets. The development of infrared focal plane arrays technique promotes the performance of infrared system. Great achievements were achieved in the manufacturing of uncooled microbolometer infrared focal plane arrays. By this technique, infrared system can be made in the formation of small volume, light weight, lower price and being portable. It promotes the utilization of infrared system greatly in all fields. So the techniques of uncooled microbolometer infrared imaging system become one of the main points from now on.Because the research for infrared technology started relatively late in our country, having some gaps with the world's advanced level, the study in this field is urgent and meaningful. This paper is based on the Xiamen University 985 projects "National Defense Information Security about the Taiwan Strait", and the main point in the study is the field of infrared imaging system. The goal is to achieve real-time infrared image, the display stability.In this paper, we discussed the application, categories, development and the nonuniformity correction algorithm of infrared focal plane array. The principle and interface parameters of the UL03081 uncooled microbolometer detector are also introduced in details. And the DC bias power circuit for the detector and TEC circuit are designed. The XC2V1000 is used to generate the drive sequencer, so the circuit is miniaturized. Verilog is employed to describe the driving sequencer so that the drive logic is debugged conveniently. Analog signals are sampled by AD9240 that is a high speed and parallel A/D sampling chip. Then the infrared data are converted to 1394 format and transmitted to computer through 1394 converting apparatus. Three-point and artificial Neural Network Algorithm are chosen to correct the nonuniformity at VC++6.0 environment.Finally, the process of the debugging for system are introduced and the design and debug experiences are summarized in detail.