High-sensitivity temperature and humidity sensing device based on side-polished SNMNS cascade conical structure
By using a side-polished SNMNS cascaded tapered fiber structure, the problems of low sensitivity and poor environmental adaptability of traditional fiber optic sensors are solved, achieving high-sensitivity synchronous temperature and humidity measurement and reducing costs.
CN224285968UActive Publication Date: 2026-05-26HARBIN UNIV OF SCI & TECH
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN UNIV OF SCI & TECH
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Traditional fiber optic sensors suffer from low sensitivity, uneven stress distribution, and susceptibility to environmental interference. Existing cascaded sensing devices also suffer from low sensitivity, measure only a single physical quantity, and are costly.
Method used
Employing a side-polished SNMNS cascaded tapered fiber structure, and combining tapered fiber with side polishing, along with a broadband light source, unidirectional isolator, attenuator, and signal processing unit, synchronous demodulation of temperature and humidity is achieved.
Benefits of technology
It improves sensor sensitivity, enhances environmental adaptability, achieves high-precision sensing of multiple parameters, and reduces costs.
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Abstract
The utility model discloses a high-sensitivity temperature and humidity sensing device based on a side-polished SNMNS cascade conical structure. The device comprises a broadband light source, a one-way isolator, a sensing unit, an attenuator, a signal processing unit and an upper computer which are sequentially connected through single-mode optical fibers. The sensing unit is composed of a tapering optical fiber cascaded side-polished SNMNS structure with the taper waist diameter of 4 microns, the taper area length of 20 mm and the waist area length of 1 mm. The non-adiabatic tapered optical fiber is prepared through a fused biconical taper method, and the free spectral range is expanded by using the vernier effect of a cascade structure, so that sensitivity amplification is realized. The refractive index of the optical fiber changes due to changes of external temperature and humidity, and the signal processing unit demodulates a spectrum inversion parameter value by modulating wavelength drift of an interference spectrum. The problems of low sensitivity and cross sensitivity of a traditional sensor are solved, and the sensor is suitable for multi-parameter high-precision sensing of environments such as industrial monitoring and biomedical treatment.
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