Dissertation > Excellent graduate degree dissertation topics show

The Design of Measuring and Controlling System of the NIRS Instrument Based on CCD

Author: ZuoHui
Tutor: WangZhiHong
School: Jilin University
Course: Precision instruments and machinery
Keywords: Near-infrared CCD Dark current CPLD USB bus Wavelength calibration White calibration
CLC: TH744.1
Type: Master's thesis
Year: 2007
Downloads: 631
Quote: 2
Read: Download Dissertation

Abstract


Modern Near Infrared Spectroscopy is the fastest growing since the 1990s, most dramatic spectral analysis technique, known as the analysis of the Giants. Near Infrared Spectroscopy analysis speed, low-cost, non-destructive pollution, etc., and therefore widely used. Near Infrared Spectroscopy physical methods of analysis of the chemical composition and content reflect the characteristics of atoms and molecules, the emission and absorption spectra of substances. The organic material mainly used for qualitative and quantitative analysis of an analytical technique, particularly for the rich hydrogen-containing group (CH, OH, SH, NH, etc.) have significant spectral information. Near Infrared Spectroscopy comprehensive multidisciplinary knowledge of spectroscopy, chemometrics, computer applications, and basic testing techniques, in order to achieve a near-infrared spectrometer optical, mechanical, electrical, and count the integrated design. The charge coupled device referred to as the CCD, its projection based on the characteristics of the charge as the signal, and is different from most other devices based on the current or voltage signal. CCD is a photoelectric conversion device. It is stored in the form of charge packets, and transfer information, is composed mainly by the part of the photosensitive cells, the input structure and an output structure. CCD working process including the charge generation, storage, transfer, and read out the four links. This thesis is divided into six chapters, the main task is to design and realize the monitoring and control system of the CCD-based near-infrared spectrometer. Complete spectrometer optical signal detection, signal transfer CCD, an analog signal processing, analog to digital signal conversion, signal buffer, data transfer, power management and monitoring software design. Lot of research work on the basis of this article is mainly completed the work and results of the following: 1. Designed to complete the measurement and control system of CCD-based near-infrared spectrometer to achieve the following functions: (1) to achieve the correct transfer CCD signal, to signal amplification process, the ability to capture and rapid transmission of data, (2) the completion of the power management, and reduce the noise to a certain extent; (3) microcontroller to achieve a low-level control, communication with the host computer; (4) monitoring and control software to complete the upper layer of the bottom of the display control, communications, and spectral data, calculations, instrument calibration and calibration. 2 the whole FBI tested the main indicators of the instrument to be able to meet the requirement that these indicators. The instrument indicators are as follows; wavelength measurement range of the instrument (1): 700 nm to 1000nm; (2) the instrument stray light: ± 0.5%; (3) the instrument wavelength accuracy: ± 0.5nm; (4) the instrument resolution 10nm; (5) instrument measuring time lt; 5s; (6) the instrument data resolution of 0.5nm; (7) the wavelength interval multi-file selection. Measurement and control system design, several key technologies: (1) the use of the CPLD large-scale programmable logic devices, a graphical programming language and VHDL language method of combining the CCD drive timing, at the same time generate the A / D conversion The read clock of the clock, and a cache; (2) using the subtracting circuit by the potentiometer and integration op amp of suppressing the dark current noise of the signal, to extract the useful signal; (3) use CYPRESS the CY7C68013 achieve the USB2. 0 large quantities of data transmission; (4) prepared using VC 6.0 the upper monitoring and control software, wavelength calibration strike whiteboard correction factor corrected whiteboard modules to complete the detection of soybean samples can show the absorbance spectra of the samples. After preliminary testing, the instrument has reached the design requirements, but there are still a few problems to be further studied, the following main points: 1. Using correlated double sampling circuit to improve the signal-to-noise ratio, and noise suppression; 2. Integration time multi-file adjustable integration time since adjustment; 3. increase the transmission rate of the interface, to remove the cache module; 4 also need to sample a large number of detection experiments.

Related Dissertations

  1. Study on Two Dimensional of Auto-Collimator Based on DSP,TH741.14
  2. Research on Temperature Measurement Technique Based on CCD Image Sensor,TH811
  3. Research on the Image Acquisition System Based on CMOS Star Sensor,V448.2
  4. Research on Synchronous Motor Excitation Control System,TM341
  5. Research on the Optimization of Laser Triangulation Device,TH744.5
  6. Data Collecting and Processing of Multi-Linear-CCD Visual Measuring System,TP274.2
  7. Design the Control System of Ocean Wave’s Simulation Table Based on Theory of Fuzzy Turning PID,TP273.4
  8. Studies Preparation of Procyanidines from Grape Seeds and Mycotoxins Determination,TQ461
  9. The Combined Effect of Several Environmental Factor on Fertilization, Hatching and Juvenile Growth of Nile Tilapia,S917.4
  10. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1
  11. Research on Design of Intelligent Testing System of Grain Suspension Velocity,S220.2
  12. Monitoring Leaf Nitrogen Status in Rice with Near Infrared Spectroscopy,S511
  13. 1,3 - propanediamine shrink o-vanillin 3d-4f heteronuclear bimetallic complexes synthesis, structure and properties of,O627.3
  14. MTF Measurement of CCD Digital Camera,TP391.41
  15. The Application of CMOS Imaging Sensor on AOI Equipment,TP212
  16. Experimental Study on the Ethylene/air Diffusion Flame Based on Near-infrared Emission Spectrometry Measurement,TK16
  17. Instrument-to-Instrument Calibration Transfer and Standardization of Spectra,O657.33
  18. Military reconnaissance rockets imaging feature analysis and processing research,TP391.41
  19. Embedded Power Quality Monitoring Terminal Research and Design,TP368.1
  20. Linear CCD industrial camera data acquisition system design and research,TP274.2
  21. DSP FPGA -based near-infrared detector key technology research,TN791

CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Spectrometers
© 2012 www.DissertationTopic.Net  Mobile