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Long distance passive liquid level sensor based on distributed fibers

A technology of liquid level sensor and distributed optical fiber, which is applied in the direction of liquid level indicators, instruments, engine lubrication, etc., can solve the problems of low precision and poor stability, and achieve high measurement precision, good stability, and commercialization Effect

Active Publication Date: 2017-04-26
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low precision and poor stability of the current optical fiber liquid level sensor, the present invention proposes a long-distance passive liquid level sensor based on distributed optical fiber

Method used

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  • Long distance passive liquid level sensor based on distributed fibers
  • Long distance passive liquid level sensor based on distributed fibers
  • Long distance passive liquid level sensor based on distributed fibers

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Embodiment 1

[0028] A long-distance passive liquid level sensor based on distributed optical fiber, the sensor is 10m long, requires measurement accuracy x=1cm, and measuring range h=1m.

[0029] The liquid level sensor includes: 1 1550nm semiconductor laser 101 with an output power of 3 watts; an optical fiber array 102 made of 100 (fiber number N=h / x=100) multimode optical fibers for communication, with a length of 10m / root; 100 A wavelength division multiplexer array 103 composed of a 3dB one-to-two wavelength division multiplexer; a comparison circuit 104 for comparing the intensity of the returned light signal; an aluminum material support plate 105 for fixing and supporting the end of the optical fiber. The optical fibers in the optical fiber array 102 are in one-to-one correspondence with the beam combining arms C of the wavelength division multiplexers in the wavelength division multiplexer array 103 and are fused together.

[0030] When measuring, the heights of the fiber ends of ...

Embodiment 2

[0032] A long-distance passive liquid level sensor based on distributed optical fiber, the sensor is 10m long, the measurement accuracy is required to be x=1.5cm, and the measuring range is h=1m.

[0033] The liquid level sensor includes: 1 1550nm semiconductor laser 101 with an output power of 3 watts; 67 (the number of optical fibers N=h / x≈66.7 ≈67; it should be noted here that when calculating the required number of optical fibers, As long as there is a decimal, it will be forwarded to ensure measurement accuracy) An optical fiber array 102 made of multimode optical fibers for communication, with a length of 10m / root; a wavelength division multiplexer array 103 composed of 67 3dB one-to-two wavelength division multiplexers; A comparison circuit 104 for comparing the intensity of the returned light signal; an aluminum support plate 105 for fixing and supporting the end of the optical fiber. The optical fibers in the optical fiber array 102 are in one-to-one correspondence wi...

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Abstract

The invention discloses a long distance passive liquid level sensor based on distributed fibers, for solving the problem that a current fiber liquid level sensor has low accuracy and low stability. The long distance passive liquid level sensor based on distributed fibers comprises a light source, a comparison circuit, a wavelength division multiplexing device array formed by N wavelength division multiplexing devices, and a fiber array formed by N fibers, wherein pumping arms of the N wavelength division multiplexing devices are connected with the light source; signal arms of the N wavelength division multiplexing devices access the comparison circuit; beam combination arms of the N wavelength division multiplexing devices are correspondingly connected with head ends of the N fibers one to one; tail ends of the N fibers are measuring ends; the vertical distance between the end surfaces of the tail ends of the two adjacent fibers is x, and x is the measuring accuracy to be achieved. The long distance passive liquid level sensor based on distributed fibers can determine the liquid level position according to the abrupt change position of luminous intensity, being similar to digital detection, wherein the measuring accuracy is mainly decided by the distributed spacing of the fibers. Besides, the long distance passive liquid level sensor based on distributed fibers can eliminate the influence of energy shaking of light source and external disturbance on measurement, is slightly influenced by environment, and has high measuring accuracy and high stability.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a long-distance passive liquid level sensor based on distributed optical fibers. Background technique [0002] Liquid level sensors have very important applications in industry, national defense and other fields. At present, the most commonly used liquid level sensors are mainly ultrasonic, radar and electronic sensors. These sensors have a common disadvantage, that is, electricity is brought into the measurement site, so they cannot be used in strong electromagnetic interference, flammable, explosive and other occasions. [0003] The optical fiber liquid level sensor uses electrically insulated optical fiber as the signal transmission medium, and uses light as the detection signal, so the probe end can be made without electricity, which is especially suitable for liquid level detection in dangerous places such as oil depots. However, due to the immatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/292
CPCG01F23/2921Y02E30/30
Inventor 彭波许彦涛郭海涛陆敏
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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