Hollow core photon crystal fiber-optic fiber gas sensor
A technology of hollow-core photonic crystals and gas sensors, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of complex system devices, large optical path coupling loss, and difficult control of absorption optical path, and achieve flexible and simple structure and reduce light loss , the effect of light weight
Inactive Publication Date: 2010-05-26
ZHONGBEI UNIV
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[0014] The present invention provides a hollow-core photonic crystal fiber-optic gas sensor in order to solve the problems of the existing fiber-optic gas sensor that the system device is relatively complicated, the absorption optical path is not easy to control, and the coupling loss of the optical path is relatively large.
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[0021] A hollow-core photonic crystal fiber gas sensor, comprising a light source 9, a light guide gas chamber optical path connected to the light source 9 through an ordinary optical fiber 1, an optical splitter 10, and a reference optical path that adopts an ordinary optical fiber 1, and is arranged in the light guide gas chamber The other end of the two optical paths of the optical path and the reference optical path includes a photodiode 11 and a lock-in amplifier 12, which are used to provide signals for the external gas concentration monitoring circuit 15. The crystal fiber 2 is provided with micron-sized air-permeable microholes 3 .
[0022] An optical switch 13 is provided at the light inlet end of the optical path of the light-guiding gas chamber, and the optical splitter 10 can be connected to multiple light-guiding gas chambers using the hollow-core photonic crystal fiber 2 through the optical switch 13, and the hollow-core photonic crystal fiber 2 is opened. There ...
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The disclosed sensor is gas sensor of optical crystal fiber with hollow core. The air sensor includes light source, light guiding gas-cell light path, reference light path of general optical fiber, and signal conversion part. Through general optical fiber, and light splitter, the light guiding gas-cell light path is connected to light source. Being setup at another end of the light guiding gas-cell light path and the reference light path, the said signal conversion part including photodiode, and phase-locked amplifier is in use for providing signal for circuit of monitoring external gas concentration. Optical crystal fiber with hollow core of containing gas permeable micropores in micro level is adopted in the light guiding gas-cell. Comparing current optical fiber gas sensor, the invention possesses advantages: simple system, easy of controlling absorbed light path, and coupling loss. The invention raises effective absorbed light path, and response seeped of parts so as to suit monitoring gas in site.
Description
technical field [0001] The invention relates to an optical fiber gas sensor, in particular to a hollow-core photonic crystal optical fiber gas sensor with high sensitivity, fast response speed and large measuring range based on the hollow-core photonic crystal optical fiber. Background technique [0002] Optical fiber gas sensor is a new type of sensor that appeared in the late 1980s. After more than 20 years of development, it has been applied in many aspects of social life: industrial gas online monitoring, harmful gas analysis, ambient air quality monitoring and explosive gas detection, and analysis of volcanic eruption gas. Industrial needs and people's concern for the environment make the development of fiber optic gas sensors very fast. The rapid development of fiber optic gas sensors is due to its incomparable advantages over traditional sensors: [0003] (1). Non-contact telemetry capability. The optical fiber transmission loss is small, which can allow long-dista...
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IPC IPC(8): G01N21/31G01N21/27
Inventor 薛晨阳张文栋熊继军刘俊张斌珍陈尚谢斌
Owner ZHONGBEI UNIV