Optical fiber macro-bending coupling structure liquid level probe based on dark field detection
An optical fiber macrobending and dark field detection technology, applied in the field of liquid level probes, can solve the problems of poor robustness, low precision and poor stability, and achieve the effects of low power consumption, guaranteed stability and increased strength
Inactive Publication Date: 2014-12-17
ZHONGBEI UNIV
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Abstract
The invention discloses an optical fiber macro-bending coupling structure liquid level probe based on dark field detection. The invention provides a liquid level sensing principle based on a cladding mode frustrated total internal reflection (CMFTIR) effect for the first time and successfully applies the principle. The distribution of a mould field in optical fibers is changed based on a macro-bending manner, the occupied ratio of cladding mode energy in the optical fibers is increased, and the CMFTIR effect is enhanced; meanwhile, a macro-bending radiation effect realizes the macro-bending coupling of the two optical fibers; a sensing signal is transmitted to a dark field through the macro-bending coupling manner, and the modulation depth of the coupling process is enhanced; meanwhile, the higher occupied ratio of the cladding mode energy is obtained in the passive optical fibers, and the CMFTIR effect is further enhanced; meanwhile, the stability of the coupling structure and the consistency of a sensor are guaranteed; the signal to noise ratio is effectively improved through detecting the signal of the dark field; the liquid level probe with low cost, low power consumption and high performance is realized, and the distinguishing degree is higher than 4dB.
Application Domain
Machines/enginesLevel indicators +1
Technology Topic
PhysicsSignal-to-noise ratio (imaging) +10
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