A cascaded optical fiber breathing sensor system and its testing method

Abstract

Disclosed in the invention is a cascaded optical fiber respiratory sensing system comprising a voltage-stabilized power source, a broadband light source and a driving circuit thereof, an optical fibercoupler, a cascaded optical fiber sensor, a spectrum demodulator, a data acquisition card, a microprocessor and a display output unit. The cascaded optical fiber sensor being a single mode-less mode-multi-core-less mode-single mode cascaded fiber sensor comprises a multi-core fiber clamped and fused between a first less-mode fiber and a second less-mode fiber; the other end of the first less-modefiber is fused with an input single-mode fiber; and the other end of the second less-mode fiber is fused with an output single-mode fiber. Light from the broadband light source is coupled by the optical fiber coupler; the coupled light passes through the cascaded optical fiber sensor; a wavelength drift signal is received by the spectrum demodulator; the data acquisition card transmits the signalto the microprocessor; and the microprocessor carries out amplification, filtering, and separation on a series of wavelength drift signals to obtain respiratory signals. The system has advantages ofsmall size, light weight, simple structure, great easiness in preparation, high sensitivity and good performance of electromagnetic interference prevention and the like.

Description

Technical field [0001] The invention relates to a medical signal detection device, in particular to a breathing signal sensor realized by a single-mode-few-mode-multi-core-few-mode-single-mode fiber cascade structure. Background technique [0002] Respiration is an important physiological process of the human body. The monitoring and detection of human breathing is also an important part of modern medical monitoring technology. It is used to evaluate the patient's respiratory function status, diagnose the type and degree of respiratory disorders, and dynamically monitor the respiratory function of high-risk patients. Whether it is a disease of the respiratory system itself or other important organs, it will affect the respiratory center to a certain extent. Failure of respiratory function and failure of other organ functions are mutually causal. Therefore, a good respiratory function test is very important for the treatment of the disease. [0003] The extraction methods of respir...

AI Technical Summary

Problems solved by technology

[0009] In summary, there is currently no fiber optic sensor with a single-mode-few-mode-multi-core-few-mode-single-mode structure, especially in the detection of respiratory physiological signals

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