Single optical fiber tracing type high precision continuous liquid level measuring method

A measurement method and tracking technology, applied in the field of measurement and control, can solve the problems of the long-term drift of the sensor, the measurement results are easily affected by the change of liquid density, and it is difficult to achieve high-precision measurement. Reliable effect

Inactive Publication Date: 2002-06-05
DALIAN UNIV OF TECH
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Problems solved by technology

At present, the continuous measurement of liquid level in the petrochemical industry mostly adopts the method of measuring pressure to convert liquid level. This method has the disadvantage that the measurement result is easily affected by the change of liquid density and the long-term drift of the sensor, and it is difficult to achieve hig

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  • Single optical fiber tracing type high precision continuous liquid level measuring method
  • Single optical fiber tracing type high precision continuous liquid level measuring method

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Embodiment Construction

[0007] The best embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0008] As shown in the accompanying drawing, the optical signal with a central wavelength of 850nm sent by the LED (3) is transmitted to the optical signal fixed on the slider (14) through the optical fiber coupler (5), the single-core optical cable (6) and the sealed optical fiber union (10). Optical fiber sensing head (13). The sensing head is an 80-90 degree conical tip made by arc melting or optical grinding at the end of a common multimode communication fiber. When the probe is placed in the air, a part of the light can form total reflection at the tip of the cone, and transmit back to the PIN photodetector (4) via the same optical fiber (6) and coupler (5), and the intensity of the signal is I0; When the sensing probe is placed in the liquid (16), since the refractive index of the liquid is higher than that of the air, the total reflecti...

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Abstract

The preent invention relates to measurement and control technology. The end of single multiple-mode optical fiber is processed through electric arc smelting pull or optical grinding to form conic tipas sensing head, which is combined with computer controlled servo mechanism to realize the continuous liquid level measurement. The press invention features that the servo mechanism to drive the optical fiber sensing ehad consists of stepped motor, screw arbor, block and outer casing tube with guide groove; its motion direction to trace liquid surface is determined by the strength of the feedbacksignal from the sensing head and the liquid surface position is calculated from the step number of the stepped motor corresponding to the change in the feedback signal the sensing head produces whilepassing through the air-liquid interface. The method has a measurement precision within 0.1 mm in the 2 mm range, is not affected by the liquid density, has no long term drift, and may be used in thepetrochemical system.

Description

technical field [0001] The invention belongs to the technical field of measurement and control, relates to a high-precision liquid level continuous measurement method based on optical fiber frustrated total internal reflection sensing, and relates to the precise measurement and control of liquid levels in the petrochemical industry. Background technique [0002] Compared with traditional electrical sensors, optical fiber sensors have many advantages, such as high detection sensitivity, anti-electromagnetic interference and intrinsic safety, etc., and have been widely used in aerospace and petrochemical industries in recent years. At present, the continuous measurement of liquid level in the petrochemical industry mostly adopts the method of measuring pressure to convert liquid level. This method has the disadvantage that the measurement result is easily affected by the change of liquid density and the long-term drift of the sensor, and it is difficult to achieve high-precisio...

Claims

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Application Information

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IPC IPC(8): G01F23/292
Inventor 于清旭
Owner DALIAN UNIV OF TECH
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