物联网-智慧传输-基于波长调制技术的甲烷光纤传感系统研究.pdf
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ABSTRACT
With the rapid development of society and science technology, more and more
gaseous energy is widely used in people's production and living. Achieving real-time
concentration monitor for flammable and explosive gas in sensitive areas is very
important for protecting people's life and property effectively. With the rapid
development of distributed feedback (DFB) semiconductor laser and fiber-optic
communication technology, fiber gas sensing technology based on tunable diode laser
spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS) is gradually
attracting more and more attention of researchers. TDLAS technology is a
high-sensitive spectrum detection technology, which have a lot of advantages, such as
high sensitivity, strong anti-noise performance, high precision, fast response, easy to
implement remote measurement and so on. TDLAS technology is now widely used in
the field of gas detection and weak signal detection.
Based on the theoretical guidance of WMS, this article carry out a detailed
analysis of harmonic detection theory. According to the ways of formula derivation
and software emulation, gas absorption theory and wavelength modulation theory
were researched. The wavelength modulation and gas absorption process of signal
was simulated by system modeling and we acquired the first harmonic signal and the
second harmonic signal waveform. In hardware implementation, the article elaborate
circuit board design and implementation process of the system, which include the
semiconductor laser diode driving circuit and signal modulation circuit based on
operational amplifier, the sine wave and triangular wave generating circuit, the
photoelectric detection circuit based on MAX4008, the signal frequency multiplier
circuit based on AD734, TEC temperature control circuit of semiconductor laser
based on LTC1923, low-pass filter and band-pass filter circuit and lock-in amplifier
circuit based on AD630, etc. At last, the emulation and debugging verification of these
circuits were carried out.
Key words：wavelength modulation; weak signal detection; lock-in amplifier; laser
diode driving circuit
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