Device and method for measuring liquid level of optical fiber adjustable in precision on basis of optical chaos

A technology of liquid level measuring device and optical fiber, which is applied in the direction of measuring device, liquid/fluid solid measurement, lubrication indicating device, etc. It can solve the problems of short sensing distance, complicated manufacturing of sensing unit, and inability to meet the measurement task, and achieve high precision Effects of Controlled, Intrinsically Safe Volumes

Active Publication Date: 2018-11-06
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the field of liquid measurement, optical fiber method for measuring liquid level has been widely reported, but in these methods, either the sensing unit is complicated to make, or the sensing distance of the whole system is short, or the sensor accuracy cannot be easily controlled, which cannot meet many requirements. Therefore, a long-distance and precision-controllable optical fiber liquid level sensing device and its measurement method need to be solved urgently

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  • Device and method for measuring liquid level of optical fiber adjustable in precision on basis of optical chaos
  • Device and method for measuring liquid level of optical fiber adjustable in precision on basis of optical chaos
  • Device and method for measuring liquid level of optical fiber adjustable in precision on basis of optical chaos

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specific Embodiment approach 1

[0031] Specific embodiment one: the present embodiment will describe in detail the chaotic light source module a, the chaotic source module 19 consists of DFB-LD laser 1, bias controller 2, coupler A3, optical isolator 4, optical attenuator 5 and optical fiber Composed of 6 reflectors.

[0032] The laser output from DFB-LD laser 1 is input to the input port a of the coupler A3 through the polarization controller 2, and the output port b of the coupler A3 is connected to the fiber mirror 6 through the optical attenuator 5; the output port c of the coupler A3 is connected to the optical isolator 4 connections. The function of the adjustable optical attenuator 5 is to adjust the optical power of the feedback optical path, that is, the optical power fed back to the DFB-LD laser 1, and the function of the polarization controller 2 is to control the polarization state of the light.

[0033] In addition, the configuration of the chaos source module 19 is not limited to the optical fee...

specific Embodiment approach 2

[0034] Specific embodiment two: as shown in reference 1, a fiber optic liquid level sensing device with adjustable precision based on optical chaos, including: a chaotic light source module 19, an optical fiber amplifier 7, a coupler B8, a photoelectric detection module 9, and a cross-correlation operation A unit 10, a computer 11, a circulator 12, a sensing unit 13 and a coupler C14, where there are multiple sensing units 13 and couplers C14.

[0035] The chaotic light generated by the chaotic light source module 19 enters the input port a of the coupler B8 through the optical fiber amplifier 7, the first output port b of the coupler B8 is connected to the input port a of the circulator 12, and the first output port b of the circulator 12 is connected to the sensing fiber. Each node to be tested on the sensing fiber is connected to a coupler C14, the first output port b of each coupler C14 is connected to a sensing unit 13, and the second output port c of the coupler C14 is co...

specific Embodiment approach 3

[0036] Specific Embodiment Three: Referring to Figure 2, an optical-chaos-based precision-adjustable optical fiber liquid level sensing device, the topology of the measurement sensor network module 20 may also be a parallel structure. The detection light is output to the multi-channel switch 15 through the first output port of the circulator 12, and each channel is connected to the sensing unit 13 located at a different position, and by controlling the switch states of different channels, the reflected signals of different channels are cross-correlated with the reference signal , to get the liquid level information of each monitoring point.

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Abstract

The invention relates to the field of liquid detection and particularly discloses a device and method for measuring the liquid level of an optical fiber adjustable in precision on the basis of opticalchaos. The purpose of on-line liquid level measurement with long distance, controllable precise and multiple channels is achieved. The device comprises a chaotic light source module, an optical fiberamplifier, a coupler B, a photoelectric conversion module, a data acquisition card, a computer, a circulator and a sensor network module. A sensing unit is composed of several equal-length optical fiber segments connected in series, Fresnel reflection is introduced, cross-correlation operation is used for detecting Fresnel reflection effects at gaps, and liquid level information of a to-be-measured liquid is obtained according to the changes of correlation operation results, namely correlation peaks; the precision of a sensor is effectively improved by using ultra-wideband characteristics ofa chaotic light source, and meanwhile the sensing precision is controlled by adjusting the intensity of a feedback optical signal in the chaotic light source; on this basis, the device and method alsoachieve long-distance multi-point liquid level measurement and are suitable for occasions in demands of long-distance liquid level measurement.

Description

technical field [0001] The invention relates to the field of liquid detection, in particular to a precision-adjustable optical fiber liquid level measuring device and method based on optical chaos. Background technique [0002] In the fields of aerospace, oil transportation, flood control engineering, chemical production and food processing, liquid level measurement plays a vital role. Commonly used liquid level sensors are electronic, mechanical-electronic and acoustic wave. These liquid level sensors are either complex in structure, poor in corrosion resistance, or poor in anti-interference, and cannot meet the measurement requirements of many occasions. In recent years, the rapid development of optical fiber communication technology has laid a solid foundation for optical fiber sensor technology. Measuring occasions for personal safety play a huge role. In the field of liquid measurement, optical fiber method for measuring liquid level has been widely reported, but in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/292
CPCG01F23/292
Inventor 王东薛志平靳宝全王云才王宇张明江
Owner TAIYUAN UNIV OF TECH
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