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
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above problems, the present invention provides a liquid level probe with optical fiber macrobend coupling structure based on dark field detection, which solves the problems of poor stability

Method used

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  • Optical fiber macro-bending coupling structure liquid level probe based on dark field detection
  • Optical fiber macro-bending coupling structure liquid level probe based on dark field detection
  • Optical fiber macro-bending coupling structure liquid level probe based on dark field detection

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Example Embodiment

[0051] Example

[0052] CMFTIR effect enhancement experiment (finger touch)

[0053] A single straight optical fiber, one end connected to the led light source, one end to the optical power meter. Lightly touch the fiber with a finger, and the power measured by the power meter does not change, indicating that the CMFTIR effect is hardly observed in the intact straight fiber.

[0054] A single optical fiber forms a macrobend ring structure, one end is connected to an LED light source, and one end is connected to an optical power meter. When a finger touches the top of the bent part of the optical fiber, the normalized power measured by the power meter drops by about 5%, indicating that the CMFTIR effect has increased to a certain extent. This is because the macrobending of the optical fiber causes the change of the internal mode field of the optical fiber, and relatively more cladding modes are generated in the bent optical fiber, and the light touch of the finger causes more claddi...

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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.

Description

technical field [0001] The invention relates to a liquid level probe, in particular to an optical fiber macrobend coupling structure liquid level probe based on dark field detection. Background technique [0002] In the field of petroleum, chemical and chemical production, automatic detection of liquid level of liquid chemicals is an important guarantee for safe operation; monitoring of fuel level during the operation of aircraft and ships also has a wide range of demands. At present, the traditional liquid level detection methods mainly include: mechanical float type, capacitive type, ultrasonic type, etc. Among them, mechanical float electronics have defects in automation and precision; capacitive sensors have certain safety hazards in flammable and explosive environments due to the introduction of electrical signals, and a large number of signal connection lines are very susceptible to electromagnetic interference; ultrasonic liquid Position sensors often have problems s...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 刘文怡侯钰龙苏珊张会新刘俊熊继军甄成方张迦卫
Owner ZHONGBEI UNIV
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