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Spectroscopy and spectral instrument has a very wide range of applications, the continuous development of industrial technology for spectroscopy instruments proposed higher requirements, the traditional spectral analysis instrument data processing speed and accuracy can not meet the needs of industrial development, and the other On the one hand, in recent years, with the electronic technology and the rapid development of computer technology, spectrum analysis instrument gradually to the intelligent, miniaturized direction. This issue through in-depth study of the structure and associated spectrum systems theory, linear CCD and related optical systems, ARM7 electrical systems and PC combined with the design of a multi-channel micro-visible spectrum acquisition system, namely the use of USB2.0 DMA data transmission and parallel port data transmission, to achieve a real-time acquisition of visible light spectrum. The whole system is divided into three parts: the optical system part, ARM7 circuit system hardware, system software. In the optical system, using optical access system, and using high-resolution concave grating for spectral processing, and then 2048 pixel linear CCD to detect optical signals; the ARM7 circuit system, using ARM7 microprocessor as the core of the circuit system of the MCU, the use of 16-bit precision to handle the high-speed AD CCD output voltage signal, in addition, the circuit system can be via a USB interface or parallel to, and exchange data with other devices, the interface is complete, a good scalability; software system includes the entire collection circuit working procedures and the software on the PC. Circuit under program control to work properly, CCD by the collector circuit driven and can work, the entire circuit can be correctly collected CCD output spectrum signals with PC or other device speed data exchange; PC machine software Not only can receive and display the collected spectra, spectral curves can be achieved for the calibration and noise reduction processing. The spectral acquisition system has been a real test, the job stability, compared with the traditional spectrum to have data processing speed, high precision, low power consumption, powerful, etc., can be measured in the wavelength range of 300nm ~ 800nm, the wavelength both ends of the range of error is relatively large, but in the visible range of the relevant performance indicators and error are within the acceptable range. In addition, the entire system smaller, circuits, and the size of the optical system are strictly controlled, truly miniaturization, while the cost of the overall system design has been well controlled.
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