05-09-2010, 01:33 PM
SEMINAR ON
DESIGN OF A HIGH-SPEED SPECTRAL SIGNAL PROCESSING SYSTEM WITH A FLOATING-POINT DSP FOR FT-IR SPECTROMETER
SUBMITTED BY:
ANOOP E M
ROLL NO: 11
S7T2
ABSTRACT
In this seminar paper, DESIGN OF A HIGH SPEED SIGNAL PROCESSING SYSTEM WITH A FLOATING-POINT DSP FOR FTIR SPECTROMETER a new Spectral Signal Processing System (SSPS), which uses a high-speed floating-point digital signal processor (DSP) as its central processor, is presented. The main application of the system is in Fourier transform infrared (FTIR) spectrometer. The paper explains the basic working principle of SSPS, design solutions and the architecture of hardware platform, including signal processing block, data transmission block, and memory part, the principle and implementation of each crucial device chosen for SSPS, such as DSP, dual-port RAM, Complex Programmable Logic Device (CPLD), the software design based on the characteristic of FTIR spectrometer, how to program the software in C language and assembly language, and compile it to the code that can be used by DSP, and an application of the SSPS module in an FTIR spectrometer.
FT-IR stands for Fourier Transform Infra Red, the proposed method of infrared spectroscopy. In this method IR radiation is passed through a sample. Some of the infrared radiation is absorbed by the sample and some of it is passed through. The resulting spectrum represents the molecular absorption and transmission creating a molecular fingerprint of the sample. Like a fingerprint no two unique molecular structure produce the same Infrared spectrum. This makes IR spectroscopy useful for material identification, for determining quality or consistency of sample, for determining amount of components in a mixture. The basic electronic system of FTIR spectrometer consists of an analog-to-digital converter (ADC) to capture an input signal. The resulting digital representation of the captured signal is then processed by spectral signal processing software. A control system is included to control a moving-mirror to move. Spectral signal processing software, which transforms interferogram to spectrum and processes the spectral signal, plays an important role in FT-IR spectrometer.
The hardware architecture is divided mainly into three- signal processing block, memory part and the data transmission block. The whole electronic system is controlled by a PC which also processes interferogram captured by ADC device. But for some practical applications, FTIR spectrometer needs to be designed with embedded processors. Traditional PC based FTIR spectral signal processing software is unable to meet the demands in real-time applications. A real-time alarming, based on FTIR spectrometer, is designed in this study.
Complete abstract is available in this doc:
DESIGN OF A HIGH-SPEED SPECTRAL SIGNAL PROCESSING SYSTEM WITH A FLOATING-POINT.docx (Size: 199.52 KB / Downloads: 70)