Design And Implementation Of High Speed Spectrometer Based On FPGA

With the rapid development of infrared imaging technology, the investigation of high speed spectral acquisition system, as an important part of signal and information processing system, which requires high speed and precise accuracy, is attached to great importance. To solve these problems, the following advancements are required: the circuit design, high-speed ADC technology, circuit anti-interference performance and so on.Therefore, this paper presents a new method based on FPGA for high speed spectrometer.Especially suitable for controlling synchronous acquisition, FPGA has brought great convenience to the design with the triple function it performs: flexible configuration, verification design method, complete synchronization control that can not be achieved by software. In this paper, FPGA is used as a core device, along with the high precision 14-bit ADC, which uses 1394 b and USB as the communication interface. In the design of analog front detector signal processing circuit, a reasonable design scheme is proposed according to the requirements of technical indicators. The selection of core components, the circuit principle diagram and the design of each module are involved in the design. The stability of the ADC circuit is well considered in every aspect of the design, from model selection, circuit design to noise restraint. The core control chip of the data acquisition card is the Cyclone IV Altera series FPGA. Embedded in NIOS II soft core processor, FPGA makes the system a more simple one, achieved 512 pixel sampling with frame rate up to 1000 frames / sec, precision of 13 bit high-speed spectrometer, and USB and 1394 b, thus extend the range of applications.