High-capacity optical fiber grating temperature-measuring system

A fiber grating, high-capacity technology, used in thermometers, measuring devices, measuring heat, etc., can solve the problems of small tuning range, inability to meet larger-capacity multi-point detection, low resolution, etc., to improve the use of power frequency voltage, The effect of solving the problem of high voltage creepage and improving the detection accuracy

A fiber grating, high-capacity technology, used in thermometers, measuring devices, measuring heat, etc., can solve the problems of small tuning range, inability to meet larger-capacity multi-point detection, low resolution, etc., to improve the use of power frequency voltage, The effect of solving the problem of high voltage creepage and improving the detection accuracy

CN1971225AInactive Publication Date: 2007-05-30天津爱天光电子科技有限公司
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  • High-capacity optical fiber grating temperature-measuring system
  • High-capacity optical fiber grating temperature-measuring system

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Embodiment Construction

[0035] The specific implementation, structure, features and effects provided by the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0036] As shown in Figure 1-6, a large-capacity and large-capacity fiber grating temperature measurement system, wherein,

[0037] An optical coupler or optical circulator 3, its first branch port is connected with broadband light source 1 through optical fiber 10; Its second branch port c is connected with standard fiber grating 5 through optical fiber;

[0038] The standard optical fiber grating 5 is connected to the common end of a 1×n optical switch 2, the branch port of the optical switch 2 is connected to each measurement channel, and each measurement channel is provided with a sensor group An, which is controlled by a preset The wavelength code is composed of 1-n fiber grating sensors 4 connected in series with different central wavelengths; thus, when a change i...

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Abstract

A high capacity fibre-optical grating thermometry system is disclosed, specifically a fibre-optical grating sensor which is used in high-voltage electrical power system to monitor temperature and thermometry device with this sensor. It includes fibre-optical grating sensor, a photocoupler or ring laser is connected with wide-band light source and standard fibre-optical grating via optical fibre; the standard fibre-optical grating is connected with common port of the 1*n optical switch, branching ports of the optical switch are connected with every measuring channel, a group of sensors are mounted on every measuring channel, the third branching port of the photocoupler or ring laser is connected with demodulator via optical fibre; The output of the demodulator is connected with signal processing unit; the signal processing unit has output connected with special computer which is used to control, collect, display and store. The wide-band light source is C band wide-band light source that the 3dB bandwidth is 40nm and control wave length is 1550nm; or C+L band wide-band light source that the 3dB bandwidth is 80nm and control wave length is 1570nm.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an optical fiber grating sensor used for temperature monitoring in a high-voltage power system and a temperature measuring device with the sensor. Background technique [0002] Power systems in high-voltage working conditions, such as substations, distribution stations or power supply, power generation systems, etc., are affected by many factors, such as the swing of equipment cables, power frequency vibration of electrical equipment, and equipment under humid environmental conditions. Under the action of work, construction or maintenance process defects and air oxidation, in the high-voltage main circuit of the equipment, the contact resistance of the equipment joint will gradually increase, so the surface of the joint will heat up, which will gradually increase the contact resistance and cause the temperature of the joint to rise. High vicious cycle, if the temper...

Claims

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Application Information

Patent Timeline
30 May 2007
Publication
CN1971225A
IPC
G01K11/32; G01D5/353; G01K11/3206
Inventors
周大川; 干耀生