DESIGN OF A HIGH-SPEED SPECTRAL SIGNAL PROCESSING SYSTEM WITH A FLOATING-POINT DSP FO
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Zigbee
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#1
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 and presentation 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.

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#2
26-12-2010, 09:56 AM

DESIGN OF A HIGH-SPEED SPECTRAL SIGNAL PROCESSING SYSTEM FOR FTIR SPECTROMETER
Presented By:
Anoop E M
S7 ECE
College Of Engineering, Trivandrum
2007-11 batch


.pptx   Design of a High-speed Spectral Signal Processing System with a Floating-point.pptx (Size: 1.29 MB / Downloads: 51)

OUTLINE
Introduction to FTIR spectroscopy
FTIR versus older technology
Challenges of high speed DSP design
Hardware architecture of SSPS
Software architecture of SSPS
Signal processing method
Software Implementation
Applications
Advantages


WHAT IS FTIR?
FTIR stands for Fourier Transform Infra Red
A method for obtaining IR spectra by first collecting an interferogram of a sample using an interferometer
Resulting spectrum represents molecular absorption and transmission
Molecular fingerprint
It can identify unknown materials
It can determine the quality or consistency of a sample
It can determine the amount of components in a mixture


SAMPLE ANALYSIS PROCESS

THE INTERFEROMETER
Beam splitter divides the
incoming IR beam into two
parts
Waves interfere either
constructively or destructively
depending on the position of
the moving mirror
Position of moving mirror is
expressed as Optical Path
Difference (OPD)

Mirror movement and interference of single wavelength beam
When moving mirror is in the
original position, the two paths
are identical and interference
is constructive

When the moving mirror moves
¼ of wavelength, the path
difference is ½ wavelength and
interference is destructive

The resulting signal is called an
interferogram









DESIGN SOLUTION OF UART STANDARD BY DSP


Stores blocks of code and data of SSPS
Despite of the internal memory of TMS320C6713, there are four kinds of memories:
Synchronous pipelined cache RAM
NOR FLASH memory
Synchronous dynamic RAM
Dual port RAM
Clock to four devices is provided by internal PLL of DSP
Original interferogram is stored in Dual port RAM, which is shared by both SSPS and spectrometer
All the data are stored in floating point mode



SIGNAL PROCESSING METHOD

SOFTWARE IMPLEMENTATION

ADVANTAGES OF FTIR

Fast and easy
Sensitive to “molecules”-anything that contains
chemical bonds
Internally calibrated
Positive identification
Quality control
Quantitative analysis

CONCLUSION
Both hardware and software architecture of the SSPS
module are designed
The use of high speed floating point DSP in the module
effectively accounts for the overall performance of FTIR
spectrometer
An effective signal processing method is designed for the
system
The module can also be used as a effective signal processing
platform for other real time systems which need high speed
signal processing


REFERENCES
[1] DONG Da-ming, FANG Yong-hua, XIONG Wei, LAN Tian-ge,”Design of a high speed
spectral Signal processing system with floating point DSP for FTIR spectroscopy”, The
Ninth International Conference on Electronic Measurement & Instruments (ICEMI),vol.1,
p.35-39, 2009

[2] Paduart Johan, Schoukens Johan, Rolain Yves ."Fast measurement of quantization
distortions in DSP algorithms", IEEE Transactions on Instrumentation and Measurement,
vol.5, p.1917-1923, October 2007

[3] Donatus ."DSP-based real-time implementation of a hybrid H infinity adaptive fuzzy
racking controller for servo-motor drives“, IEEE Transactions on Industry Applications,
vol 2, p.476-484, March/April 2007





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