Distributed optical fiber mode coupling biochemical sensor, optical fiber link, and sensing system

Abstract

The invention discloses a distributed fiber coupling biochemistry sensor and corresponding fiber link circuit and sensing system. The inventive sensor as basic sensing unit of sensing system comprises a long period fiber grating, Bragg fiber grating and absorbing or sensing film for chemical or biochemical molecule; a plurality of such basic sensing unit connected serially with sequence and direction forming the fiber link circuit. Sensing system comprises the fiber link circuit and broad band light source, broad band coupler, initial Bragg fiber grating, fiber light spectrum demodulator and computer. The invention is characterized in that it takes wavelength-division multiplex to realize distributed sensing and has the advantages of simple and reliable.

Description

technical field [0001] The invention belongs to the technical fields of optical fiber sensing, biology and chemistry, and in particular relates to a distributed optical fiber mode coupling biochemical sensor, an optical fiber link and a sensing system. Background technique [0002] Optical fiber chemical and biological sensor is a new type of sensing technology born in the mid-1970s. It solidifies substances that can identify and transduce chemical or biomolecules on optical fibers, and performs selective chemical or biomolecular recognition of the measured substances. , and then converted into various optical information to obtain chemical and biological information. In most sensors, the optical fiber only plays the role of light transmission, and some sensors are based on the change of the measured substance directly affecting the properties of the optical fiber waveguide for sensing. Optical fiber chemical and biological sensors have many advantages, such as high informa...

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Problems solved by technology

However, the optical fiber biosensor also has the following disadvantages: (1) the sensor and its sensing system adopt a single optical path intensity measurement method, and the fluctuation and interference of the light source, optical path and circuit system will affect the accuracy of the sensing results; (2) the long-term The resonant wavelength band of periodic fiber gratings is wide and flat, and it is very difficult to accurately determine the resonant center wavelength; (3) the drift of the resonant center wavelength of long-period fiber gratings is greatly affected by the change of ambient temperature, and it is necessary to carry out the measurement of the sensor and the measured object. Constant temperature control; (4) It is difficult to use (dense) wavelength division multiplexing and space division multiplexing technology to realize large-scale distributed chemical and biological sensing

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