In this paper, an optical fiber magnetic sensor is proposed by combining the long-period fiber grating with the sensitivity of the external refractive index and the refractive index of the magnetic fluid with the change of the external magnetic field. Theoretically, the sensitivity is 0.03602nm/Oe and the linearity of fit is 0.9998 when the magnetic field strength ranges from 30Oe to 300Oe at room temperature of 25°C.
To solve the problem of poor expansion of the traditional respiratory detection system, a detection system suitable for two-pass gas detection is proposed in this paper. A gas chamber is inserted into a fiber loop ring-down cavity. The key structural parameters, such as cavity length, optical attenuation factor, insertion loss, coupling rate, etc. Are studied. When testing two-pass gas signals simultaneously, the obtained theoretical time interval is 0.935 s. The proposed system can be potentially expanded to more signals.
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