Research On The Signal Acquisition System For Miniature Near-infrared Spectroscope

The near-infrared spectrum technology (NIR) is one of CMOS noticeable parsing techniques which develop speed is the quickest for the past ten years. The near-infrared spectral analysis technology is applying in many domains,including the farming and animal husbandry, food, the chemical industry, the petrochemical, the drugs manufacture, the tobacco and so on. The microminiaturized near-infrared spectroscope's research is becoming one of various countries research key.The article analysis the domestic and foreign miniature spectroscope development and conduct research to miniature signal acquisition system's Key technologies in the near-infrared spectroscope system. After having determined the design concept of signal acquisition system, the duty is completing the design of power and the timing in the detector module and A/D transformation module, Simultaneously completing hardware circuit design of LPC2148 which is a ARM7 chip.then we should carries on the software design for the LPC2148 firmware program, to realize system's USB data transmission function.The tasks of the prject are related to the following aspects:①Analysising the near-infrared spectroscope's trend of development as and the signal acquisition technology development.②Base on researching the signal acquisition system basic constitution and the bussing technique, then we determine the plan for the signal acquisition system's design in the near-infrared spectroscope.③Detailed elaborating signal acquisition hardware circuit system's design process, then separately introducing each module major function and the design method of the system circuit.④Carrying on the software programming to the SPI interface data transmission after In view of ARM7 the chip LPC2148 SPI bus interface characteristic.⑤Completeing the USB data transmission by using the LPC2148 software development package.⑥Carrying on the hardware test and the software test separately.