Dissertation > Excellent graduate degree dissertation topics show

The Signal Processing Method of Optical Fiber Methane Sensor

Author: WangQiao
Tutor: WangBoBo
School: Beijing Jiaotong University
Course: Physical Electronics
Keywords: Fiber methane sensor Weak Signal Lock-in amplifier Phase-sensitive detection Correlation detection
CLC: TP212.2
Type: Master's thesis
Year: 2009
Downloads: 224
Quote: 3
Read: Download Dissertation

Abstract


China 's coal mine gas is one of the important sources of coal mine natural disasters , the use of fiber optic sensors for real-time monitoring of the concentration of methane gas in the mine , to reduce mine disaster occurred is important . The optical signal receiver and signal processing technology is an important part of the optical fiber sensing technology . This paper introduces the principle of spectral absorption type optical fiber gas sensor characteristics and features based on depth study of the lock-in amplifier - based signal processing technology , the system can achieve the modulation frequency of receiving and processing the signal of 2.5MHz . The proposed signal processing system wide measuring range , good stability , fast response , long life . This system can be used for a variety of configuration of a gas sensor signal processing . The experimentally measured fiber methane sensor system by the system consisting of a 5 - hour steady degree of 0.96%, and be able to detect the lowest methane gas concentration of 8.9% . Fiber methane sensor signal modulation frequency is less than 1MHz , the signal processing circuit in the domestic advanced level .

Related Dissertations

  1. The Research of Digital Lock-In Technology,TN911.8
  2. Research of Absorbed Fiber-optic CO Gas Sensor Signal Processing,TP212
  3. Multi-frequence Weak Signal Acquisition and Processing System Research and Design,TN911.23
  4. The Research and Design of Signal Processing Technology of the Optical Fiber Displacement Sensor Based on Intensity Modulation,TN911.7
  5. Liquid crystal tunable filter spectral transmittance Test System,TN713
  6. Multi-parameter water quality monitoring self-powered wireless sensor network node key technology research,TN929.5
  7. DSP FPGA -based near-infrared detector key technology research,TN791
  8. Research and Implementation of Formation Resistivity Measurement Based on Electromagnetic Wave Propagation Theory,P631.811
  9. Argon- oxygen refining ferroalloy furnace temperature detection method,TF33
  10. Research on Precision Optical Mini-head of Inradius Measuring and Signal Processing,TH74
  11. Chaos Suppression and Array of Stochastic Resonance Methods for Early Detection of Mechanical Fault,TH165.3
  12. Weak signal detection mechanism of stochastic resonance network model and its application,TN911.23
  13. The Study of Weak Signal Detection Based on Chaotic Oscillator and Wavelet Theory,TN911.23
  14. A Research on Signal Detecting in Bio-impedance Measurement System,TN911.23
  15. Weak Signal Detection Algorithm for the Array Induction Logging Tools,P631.81
  16. Weak GPS signal acquisition algorithm and hardware implementation,P228.4
  17. Research on Acquisition Algorithm of Weak GPS Signal and Its Realization on Software Receiver Platform,P228.4
  18. A Study on the Chaos Control and the Application of the Signal Detection Based on the Modified ADVP Model,O415.5
  19. The Enhancement of Fault Detection and Diagnosis in Rolling Element Bearings Using Spectral Kurtosis and EMD,TH165.3
  20. The Study of Weak Signals in DSSS System with Long Coherent Accumulation PN Code Acquisition Technology,TN914.42
  21. Research of Transmissivity Measurement Technology in Wide Spectrum and Wide Beam System,TH74

CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Chemical sensors
© 2012 www.DissertationTopic.Net  Mobile