Thermal fiber grating wind speed and wind direction sensor and detection method

A fiber grating, wind speed and wind direction technology is applied in the direction of measuring fluid speed by using thermal variables, which can solve the problems of poor antimagnetic effect and short life, and achieve the effects of prolonging service life, low loss, improving applicability and stability

Pending Publication Date: 2019-08-27
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose a thermal fiber grating wind speed and direction sensor and its detection method. The optical fiber grating temperature sensor has the characteristics of high reliability, corrosion resistance, and electromagnetic interference resistance, so as to solve the poor antimagnetic effect of the existing thermal wind speed sensor. Due to the short service life in harsh environments, the thermal wind speed and direction sensor has the advantages of corrosion resistance, anti-electromagnetic interference, and high accuracy, and can be applied to detection environments with harsh working conditions.

Method used

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  • Thermal fiber grating wind speed and wind direction sensor and detection method
  • Thermal fiber grating wind speed and wind direction sensor and detection method
  • Thermal fiber grating wind speed and wind direction sensor and detection method

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Embodiment 1

[0036] combine figure 1 and figure 2 Describe Embodiment 1 of the present invention: a thermal fiber grating wind speed and wind direction sensor, including: a substrate 1, a heating resistance wire 2 sprayed on the substrate 1, and an orthogonal arrangement bonded to the substrate 1 Four fiber grating temperature sensors 3 around the heating resistance wire 2 are characterized in that the heating resistance wire 2 is arranged in a spiral shape, and welding joints 9 are left at both ends; the sensing element of the temperature sensor is a fiber Bragg grating .

[0037] In Embodiment 1, the fiber grating temperature sensor 3 , the heating resistance wire 2 and the thin sheath 6 are located on the leeward side of the substrate 1 .

[0038] In Embodiment 1, the substrate 1 is one or more of monocrystalline silicon, silicide, glass, and ceramics stacked in different orders; the thickness of the substrate 1 is 0.1-2.0 mm.

[0039] In Embodiment 1, the heating resistance wire 2 ...

Embodiment 2

[0046]combine image 3 and Figure 4 Embodiment 2 of the present invention is described: a kind of thermal fiber grating wind speed and wind direction sensor, its structure has been improved in above-mentioned embodiment, described fiber grating temperature sensor 3, heating resistance wire 2 and fine sleeve 6 are positioned at substrate 1 windward side; the optical fiber temperature sensor 3 is placed in the thin sleeve 6, and the thin sleeve 6 is fixed on the substrate 1 by bonding.

[0047] In Embodiment 2, the optical fiber temperature sensor 3 is entirely placed in a thin sleeve 6 and fixed on one side. The diameter of the thin sleeve 6 is 0.5-5mm; the material of the thin sleeve 6 is ceramics, stainless steel, glass, plastic, Aluminum, iron, copper and their alloys.

[0048] In embodiment 2, there is a resistance wire protection layer 7 on the surface of the heating resistance wire. The glass frit is heated to a liquid state in an environment of 400° C., and the heati...

Embodiment approach

[0049] The present invention also provides an embodiment: a method for measuring a thermal fiber grating wind speed and direction sensor, comprising the following steps:

[0050] Step 100: In a windless environment, perform a calibration measurement and record the center drift value of the fiber grating;

[0051] Step 200: Under the environment to be tested, perform detection and measurement, and record the center wavelength drift value of the fiber grating;

[0052] Step 300: Using the calibration measurement value as a reference, perform data processing on the detected FBG center wavelength drift value to obtain the wind direction and wind speed of the measurement environment.

[0053] In an embodiment, the specific process of the calibration measurement described in step 100: the heating resistance wire is heated by an AC signal with a power of 0.1-1W, and at the same time, the heating resistance wire conducts heat conduction heating on the fiber grating temperature sensor ...

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Abstract

The invention discloses a thermal fiber grating wind speed and wind direction sensor and a detection method. The sensor comprises a substrate, a heating resistance wire spattered on the substrate andfour fiber grating temperature sensors which are pasted on the substrate and are orthogonally arranged on four sides of the heating resistance wire, wherein the heating resistance wire is spiral; leadwelding joints are arranged at two ends of the heating resistance wire; sensing elements of the temperature sensors are Bragg fiber gratings. The detection method comprises the following steps: generating heat through the heating resistance wire, enabling a temperature field around the sensors to change when wind blows, causing different degrees of drift of central wavelengths of four fiber gratings, respectively detecting wavelength drift conditions of the four fiber gratings, and processing data to obtain real-time wind speeds and wind directions. The thermal fiber grating wind speed and wind direction sensor is capable of simultaneously measuring the wind speeds and wind directions, has the advantages of corrosion resistance, electromagnetic interference resistance and high accuracy, and can be applied to detection environments with severe operation conditions.

Description

technical field [0001] The invention relates to a wind speed and direction sensor in the field of sensors, in particular to a thermal optical fiber grating wind speed and direction sensor and a detection method. Background technique [0002] Wind is a very common natural phenomenon that is closely related to people's lives. The detection of wind speed and direction is of great significance in many fields such as industrial and agricultural production, transportation, energy development, and weather forecasting. [0003] According to the principle, the measurement of wind speed is mainly divided into mechanical measurement method, pitot tube measurement method, ultrasonic measurement method, laser Doppler measurement method, thermal measurement method, etc.; the thermal anemometer prepared by using the thermal measurement principle is used to measure airflow Velocity instruments are widely used because of their high measurement accuracy, ease of use, wide measurement range, a...

Claims

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Application Information

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IPC IPC(8): G01P5/10
CPCG01P5/10
Inventor 孙永国侯志敏于广滨
Owner HARBIN UNIV OF SCI & TECH
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