.64 ¡Á 64 Uncooled Infrared Fpa Readout Signal Processing Circuit Design

This dissertation studies the signal processing of 64X64 uncooled infrared focal plane array's readout circuit. The principle of the signal processing is studied and proper circuit is successfully designed and made to realize the signal processing.The feature of the signal processing circuit for the uncooled infrared focal plane array depends on the readout circuit. Readout circuit discussed here is a RC oscillatory circuit. The resistor of the oscillatory circuit is VOX thin film, which is very sensitive to temperature. The resistor's resistance is decided by the infrared radiation it absorbs in. When temperature changes, the resistor's resistance changes and this make the period of the output signal of the readout circuit changes regularly. The relationship of the temperature and the period is discussed. The signal processing circuit employs the relationship to extract the temperature from the period of the output signal. The imaging processing part uses the extracted temperature information to get the infrared image.The dissertation studies the readout signal processing circuit and realized it with a FPGA chip. First, we discuss the development of the uncooled infrared focal plane array and its working principle. Secondly, we study the readout signal processing circuit and propose a kind of solution for the circuit. Furthermore we make the circuit according to this solution. At last we test this realized circuit and give the test result.The research of the readout signal processing circuit will contribute to the further study of the uncooled infrared focal plane array.