High-sensitivity phase demodulation optical fiber gas sensing system
A phase demodulation and gas sensing technology, applied in the measurement of phase influence characteristics, color/spectral characteristics, etc., can solve the problems of complex detection, low precision and large error, and achieve high gas detection sensitivity and sensitive gas detection. Effect
Pending Publication Date: 2019-01-01
SHANDONG JIANZHU UNIV
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[0006] The purpose of the present invention is to provide a high-sensitivity phase demodulation optical fiber gas sensing system to solve the problems of complex detection, low precision and large errors in the above-mentioned background technology
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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "inner" and "outer" are based on The orientation or positional relationship shown in the accompanying drawings is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element m...
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The invention discloses a high-sensitivity phase demodulation optical fiber gas sensing system, which comprises a detecting light source, a reverse refractive index eliminating matching liquid, a coupler, a WDM wavelength division multiplexer A, a gas inlet, a gas absorption pool, a gas outlet, a WDM wavelength division multiplexer B, a Faraday rotating mirror A, an excitation light source, laserdriving with modulated signal, a Faraday rotating mirror B, a PZT wave carrier, delay optical fiber, a lock-in amplifier, a photodetector, and a PGC demodulator. According to the present invention, the propagation phase of the other non-characteristic absorption wavelength laser beam on the transmission path is changed through the gas absorption characteristic wavelength laser so as to correlate the gas concentration with the laser phase change, and the change value of the phase is obtained through the Michelson interferometer PGC demodulation algorithm so as to sensitively detect the gas concentration; the new optical fiber gas sensing method is achieved, and is combined with the lock-in amplifier with the same frequency as the laser modulation so as to achieve the gas detection sensitivity of ppb level or higher.
Description
technical field [0001] The invention relates to an optical fiber gas sensor, in particular to a high-sensitivity phase demodulation optical fiber gas sensing system; it belongs to the technical field of photoelectric detection. Background technique [0002] Optical fiber gas detection technology is an important technology in the field of modern sensing, which can realize remote online detection of tens of kilometers or even hundreds of kilometers, and has been widely concerned in recent years. Optical fiber gas sensors have gradually shown significant advantages in various industries such as safety, high stability and anti-electromagnetic interference, such as industrial process gas detection, remote detection of disaster gas in coal mines, gas detection in flammable and explosive environments, gas detection in nuclear radiation areas, etc. , will be one of the major science and technologies that will be focused on at present and in the future. [0003] The basic principle ...
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IPC IPC(8): G01N21/41G01N21/31
CPCG01N21/31G01N21/41
Inventor 赵燕杰李鲁艳王惠临陈婷李爽陈莹
Owner SHANDONG JIANZHU UNIV