Orthogonal polarization optical fiber biorefractive index sensor and its detection method

Abstract

The invention discloses an orthogonal polarization optical fiber biological refractive index sensor and a detecting method thereof. The refractive index sensor includes a broadband light source, a polarizer, a polarization controller, a sensor probe and an orthogonal polarization demodulation processing unit which are sequentially connected with one another by optical fibers; the sensor probe includes a microfluidic control chip for control of injection and discharge of a trace biological solution, and tilted optical fiber optical gratings arranged in microfluidic channels of the microfluidic control chip; the orthogonal polarization demodulation processing unit includes an optical fiber polarization beam splitter, a first spectral detector, a second spectral detector and a spectrum differential module; the sensor probe is connected with the input ends of the first spectral detector and the second spectral detector through the optical fiber polarization beam splitter, and the output ends of the first spectral detector and the second spectral detector are connected with the spectrum differential module. The refractive index sensor has the advantages of high measuring precision of the refractive index, and can realize simultaneous measurement of environmental temperatures.

Description

technical field [0001] The invention relates to an optical fiber refraction index sensor, in particular to an orthogonally polarized optical fiber biological refraction index sensor and a detection method thereof. Background technique [0002] With the continuous deepening of human understanding of the nature of life, life process, information exchange between living organisms and their living environment, bioinformatics has developed rapidly. The important means of biological information acquisition depends on sensing technology, one of the three major technologies of information science. Intelligence and miniaturization are the development direction of biosensors in the future. Without increasing the size of the array or even a single sensing probe, the acquisition of biological information in complex systems can be significantly improved, in order to more accurately and truly reflect the characteristics of living organisms, and realize the single-cell and single-molecule ...

AI Technical Summary

Problems solved by technology

However, the probe manufacturing process of this method is relatively complicated, and a high-precision ion sputtering coating machine is required to achieve nanoscale gold coating on the surface of the optical fiber, which increases the cost of equipment manufacturing

At the same time, the optical fiber sensing system based on surface plasmon resonance can only obtain SPR excitation in a single polarization state (parallel to the writing direction of the grating), but cannot achieve SPR excitation in another polarization state orthogonal to it, so Two sets of orthogonal polarization state energy information cannot be used at the same time, and the measurement accuracy is not enough

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