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Preparation method and product of a calibration-free serial fiber grating temperature sensor

A temperature sensor, fiber grating technology, applied in thermometers, thermometers with physical/chemical changes, instruments, etc., can solve the problems of complex process, low efficiency, long time, etc., to achieve controllable degree of relaxation, batch consistency, batch good consistency

Active Publication Date: 2019-11-22
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a calibration-free serial fiber grating temperature sensor preparation method and products, the purpose of which is to eliminate the stress of the fiber grating through a highly consistent degree of relaxation, and the optical fiber The grating is packaged so that the fiber grating is hardly affected by stress, and the optical parameter change of the grating is highly consistent with the influence of temperature. A batch of products only needs to be calibrated once, and there is no need to calibrate each series-type fiber grating temperature sensor, thus solving the problem Each product of the existing tandem fiber grating temperature sensor needs to be calibrated separately, and the technical problems are complex process, long time and low efficiency

Method used

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  • Preparation method and product of a calibration-free serial fiber grating temperature sensor
  • Preparation method and product of a calibration-free serial fiber grating temperature sensor
  • Preparation method and product of a calibration-free serial fiber grating temperature sensor

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preparation example Construction

[0030] The calibration-free serial fiber grating temperature sensor preparation method provided by the present invention comprises the following steps:

[0031] (1) Embedding the packaged core component in the groove of the horizontal substrate, so that the through holes at both ends of the packaged core component expose the surface of the substrate, such as figure 1 shown;

[0032] The horizontal substrate has at least one groove, preferably a plurality of grooves for mass production, and the plurality of grooves are preferably arranged side by side, so that the fixed package core components are used to set the preset height-setting standard components. position on a straight line. Preferably, the groove is a cylinder, and its cross section is arc-shaped matching the arc of the package core component. The radius of the groove is between 1-3mm, the depth is between 0.9-2.9mm, and the length is between 20- Between 60mm.

[0033] The two ends of the package core are cylinders...

Embodiment 2

[0072] Calibrate and detect the tandem fiber grating temperature sensor prepared in Example 1:

[0073] Sensor temperature coefficient calibration:

[0074] After the fiber grating temperature sensor is packaged, the relaxation state of each grating position is different, resulting in a different temperature coefficient. Here, because of the use of fixed-height standard parts and auxiliary packaging substrates for packaging, good consistency control has been obtained. In the batch of products, only one of the sensors needs to be calibrated to be used for parameter setting of other sensors.

[0075] Step 1: Select the calibration step size according to the required calibration temperature range and desired calibration accuracy, that is, within the calibration temperature range, record a wavelength at a certain temperature interval, and you can choose 10°C, 20°C, 30°C, 40°C as the Calibration step, the shorter the calibration step, the higher the calibration accuracy.

[0076]...

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Abstract

The invention discloses a calibration-free serial fiber grating temperature sensor and a preparation method thereof. The method comprises the steps of: (1) embedding a packaged core component in a groove of a horizontal substrate; (2) fixing a height-setting standard component at a preset position in a recess in the middle of the packaged core component; (3) placing The optical fiber passes over the height-fixing standard and makes the grating close to the top of the height-fixing standard; (4) stripping; (5) encapsulating. The sensor includes a package shell part, a package core part, and an optical fiber engraved with a grating; the optical fiber is fixed to the package core part, and its grating is exposed to a groove in the middle of the package core part and is in a relaxed state; the The package shell part is nested with the package core part fixed with the optical fiber and fixed outside the package core part. The manufacturing method of the calibration-free serial fiber grating temperature sensor provided by the invention has good stability and good batch consistency, and only one calibration is required for the same batch of products.

Description

technical field [0001] The invention belongs to the field of optical fiber gratings, and more specifically relates to a calibration-free series optical fiber grating temperature sensor. Background technique [0002] Due to its unique anti-electromagnetic interference, electrical insulation, and explosion-proof properties, fiber optic grating temperature sensors have been widely used in many special fields, such as electric power temperature measurement, petroleum and petrochemical temperature monitoring, and fire alarms in subway tunnels. Fiber Bragg grating temperature sensor includes series type and parallel type. The series type fiber grating temperature sensor does not need light splitting when connected in the channel, so the loss is small, and the number of channel sensors is double that of parallel connection. [0003] Tandem fiber gratings are sensitive to temperature and strain at the same time due to their special physical properties, which makes it necessary to ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/3206
CPCG01K11/3206
Inventor 廖招龙张心贲张广博曹蓓蓓
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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