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A fiber grating temperature measuring sensor and a temperature measuring method for an inner conductor of a radio frequency cable

A technology of temperature measurement sensor and fiber grating, which is applied in the direction of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve the problem that the temperature measurement of the inner conductor of the radio frequency cable cannot meet the requirements of the test.

Active Publication Date: 2021-08-20
THE 23RD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the rated power of the RF cable must be determined through tests, and the rated power of the RF cable is closely related to the maximum operating temperature of the inner conductor, so the above two methods for measuring the temperature of the inner conductor of the RF cable cannot meet the requirements of the test.

Method used

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  • A fiber grating temperature measuring sensor and a temperature measuring method for an inner conductor of a radio frequency cable
  • A fiber grating temperature measuring sensor and a temperature measuring method for an inner conductor of a radio frequency cable
  • A fiber grating temperature measuring sensor and a temperature measuring method for an inner conductor of a radio frequency cable

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Embodiment

[0056] Select a 9 / 125 single-mode fiber with a polyimide coating and a cladding diameter of 125 μm. The engraved length L of the grating area of ​​the fiber grating is 1.2 mm, and the angle α of the end face of the fiber grating is 8°. Epoxy resin glue 353ND, apply glue on the above fiber grating, the glue application position is along the length direction away from the gate area, the glue application position is selected to be 1.0mm away from the grid area, pay attention to the glue not to pollute the grid area; The fiber grating 3 penetrates into the through hole 21 of the ceramic mandrel 2, the central axis of the through hole of the ceramic mandrel coincides with the central axis of the outer circle, the central axis of the fiber grating and the ceramic mandrel is on the same straight line, and the inner diameter of the ceramic mandrel d is 0.125mm, and the outer diameter D is 1.0003mm, so that the end face 31 of the fiber grating exposes the length L of the port 2 of the c...

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Abstract

The invention provides a fiber grating temperature measurement sensor for measuring the temperature of the inner conductor of a radio frequency cable and a temperature measurement method of the inner conductor of the radio frequency cable. The fiber grating temperature measurement sensor comprises a glass sleeve, a ceramic core rod and a fiber grating, and the fiber The grating penetrates into the through hole of the ceramic core rod, the glass sleeve is sheathed outside the ceramic core rod, one end of the fiber grating is engraved with a grating region, and the fiber grating is engraved with a fiber grating with a grating region. The end face exposes the ceramic core rod port and is located inside the glass sleeve port to ensure that the end face of the fiber grating does not come into contact with the cable under test; the fiber grating temperature measurement sensor and temperature measurement method can measure the temperature perpendicular to the length of the cable under test. The maximum working temperature of the inner conductor of the RF cable can be directly and accurately measured. The diameter of the wound surface of the tested cable can reach below φ1.5mm, and the RF cable with a minimum outer diameter of φ5.0mm can also achieve "minimally invasive" temperature measurement. Accurately obtain the power rating of the RF cable.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, and specifically provides an optical fiber grating temperature measuring sensor for measuring the temperature of an inner conductor of a radio frequency cable and a method for measuring the temperature of an inner conductor of a radio frequency cable. Background technique [0002] In order to avoid the influence of high-frequency electromagnetic field under high power, when the rated power test is performed on the radio frequency cable, the temperature measurement of the inner conductor of the cable cannot use the traditional metal thermocouple, but the fiber grating temperature sensor. [0003] The fiber grating temperature sensor is a wavelength-selective non-metallic reflective filter device that is modulated by periodically changing the axial refractive index on the optical fiber by a certain method. Because the fiber grating has good photosensitivity, its central wavelength wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01R27/02G01R31/00G01K11/3206
CPCG01K11/3206G01R27/28
Inventor 殷海成吕姣姣张俊金溢文滕玉峰
Owner THE 23RD RES INST OF CHINA ELECTRONICS TECH GRP CORP
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