Optical fiber temperature sensor used in strong magnetic field environment

Abstract

The utility model belongs to the technical field of optical fiber sensing application, and particularly relates to an optical fiber temperature sensor used in a strong magnetic field environment. The optical fiber temperature sensor is composed of a single-mode optical fiber and a corundum sleeve, the middle of the single-mode optical fiber is a double-cone-shaped section, an ellipsoidal microbubble is embedded in the middle concave position of the double-cone-shaped section, and the ellipsoidal microbubble and a fiber core are located on the same horizontal plane. The corundum sleeve is sleeved on the biconical section, and two ends of the corundum sleeve are fixedly adhered on the single-mode optical fiber through high-temperature-resistant inorganic glue. The transverse axis of the ellipsoidal microbubble is 71.42 [mu] m-73.42 [mu] m, the longitudinal axis of the ellipsoidal microbubble is 76.73 [mu] m-78.73 [mu] m, and the minimum wall thickness between the ellipsoidal microbubble and the middle recess of the biconical section is 1.2 [mu] m-3. 2 [mu] m. The optical fiber temperature sensor is high in magnetic interference resistance, high in precision and sensitivity, capable of being used for multi-point measurement and wide in application range.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical fiber sensing application technical field, concretely relates to a kind of optical fiber temperature sensor for strong magnetic field environment. BACKGROUND

[0002] Optical fiber Fabry-Perot interferometer sensor is widely used and researched in the field of physics, chemistry and biological sensing due to its simple and compact structure, good stability, high resolution and other advantages. The advantages of optical fiber sensor in magnetic field monitoring mainly lie in anti-electromagnetic interference, high precision, strong safety, high temperature resistance and remote transmission capability. It provides an effective alternative to traditional electrical and magnetic field sensing technology. Currently, the advantages of optical fiber temperature sensor in strong magnetic field environment make it an indispensable tool in modern industry, scientific research and engineering applications. It is widely used in strong magnetic field environments in the fields of power, metallurgy, aerospace, nuclear energy, medical treatment and other fields. However, the existing optical fiber temperature sensor has weak anti-magnetic interference ability, low precision and sensitivity, weak multi-point measurement capability and small application range. SUMMARY

[0003] To solve the above technical problems, the utility model provides an optical fiber temperature sensor for strong magnetic field environment, which has strong anti-magnetic interference ability, high precision and sensitivity, can be used for multi-point measurement, and has wide application range.

[0004] The utility model adopts the technical scheme: an optical fiber temperature sensor for strong magnetic field environment, the optical fiber temperature sensor is composed of single-mode optical fiber and corundum sleeve, the middle of single-mode optical fiber is double-tapered section, the middle recess of double-tapered section is embedded with ellipsoidal micro-bubble, and the ellipsoidal micro-bubble is on the same horizontal plane with fiber core; corundum sleeve is sleeved on double-tapered section, and both ends of corundum sleeve are fixed on single-mode optical fiber by high-temperature-resistant inorganic adhesive.

[0005] Further, the transverse axis of the ellipsoidal micro-bubble is 71.42um-73.42um, the longitudinal axis is 76.73um-78.73um, and the minimum wall thickness of the ellipsoidal micro-bubble and the middle recess of the double-tapered section is 1.2um-3.2um.

[0006] Further, the transverse axis of the ellipsoidal micro-bubble is 71.42um, the longitudinal axis is 76.73um, and the minimum wall thickness of the ellipsoidal micro-bubble and the middle recess of the double-tapered section is 3.2um.

[0007] Further, the transverse axis of the ellipsoidal micro-bubble is 72.42um, the longitudinal axis is 77.73um, and the minimum wall thickness of the ellipsoidal micro-bubble and the middle recess of the double-tapered section is 2.2um.

[0008] Furthermore, the ellipsoidal microbubble has a transverse axis of 73.42 μm and a longitudinal axis of 78.73 μm. The minimum wall thickness at the midpoint between the ellipsoidal microbubble and the biconical segment is 1.2 μm.

[0009] Furthermore, the high-temperature resistant inorganic adhesive is a double bond chemical DB5012 high-temperature resistant inorganic adhesive.

[0010] Furthermore, the single-mode fiber is made by splicing two single-mode fiber segments together using a fiber optic fusion splicer, with its biconical segment and ellipsoidal microbubble formed at the splice of the two fiber segments.

[0011] The beneficial effects of this utility model are as follows: This utility model provides an optical fiber temperature sensor for use in strong magnetic field environments. This optical fiber temperature sensor has strong anti-magnetic interference capability, high accuracy and sensitivity, can be used for multi-point measurement, has strong security, low cost, and a wide range of applications. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an optical fiber temperature sensor used in strong magnetic field environments. Detailed Implementation

[0013] Example

[0014] like Figure 1 As shown, an optical fiber temperature sensor for use in strong magnetic field environments comprises a single-mode optical fiber 1 and an alumina sleeve 2. The single-mode optical fiber 1 has a biconical segment 3 in the middle, with an ellipsoidal microbubble 4 embedded in the recessed area of ​​the biconical segment 3. The ellipsoidal microbubble 4 and the fiber core 6 are on the same horizontal plane. The alumina sleeve 2 is fitted onto the biconical segment 3, and both ends of the alumina sleeve 2 are bonded to the single-mode optical fiber 1 using high-temperature resistant inorganic adhesive 5. The ellipsoidal microbubble 4 has a transverse axis of 71.42 μm and a longitudinal axis of 76.73 μm. The minimum wall thickness of the ellipsoidal microbubble 4 and the recessed area between the biconical segment 3 is 3.2 μm.

[0015] Because the coefficient of thermal expansion of quartz is much smaller than that of corundum, the corundum sleeve expands when the temperature rises, while the single-mode optical fiber made of quartz is almost unaffected by the expansion. Therefore, the expansion of the corundum sleeve elongates the axial diameter of the ellipsoidal microbubble, thereby increasing the optical path difference. This change in optical path difference causes mode interference, which manifests as a wavelength shift in the spectrum. By monitoring the wavelength change in the spectrometer, temperature changes can be accurately detected. This structure features high sensitivity, high accuracy, a wide measurement range, and excellent environmental adaptability, making it widely applicable for precise monitoring of temperature changes.

[0016] The fiber sensor has strong anti-electromagnetic interference capability, mainly due to its use of optical signal transmission, which is not affected by electromagnetic fields. In addition, corundum as a non-metallic material, itself does not conduct electricity, so it does not respond to electromagnetic fields. This feature enables corundum material to effectively shield electromagnetic interference in strong electromagnetic field environments, preventing signal distortion or equipment failure. Compared with traditional temperature sensors, this sensor can work stably for a long time in high-temperature environments, and is very suitable for high-temperature applications such as metallurgy, aerospace, etc.

[0017] Due to the protection of the corundum tube, the sensor exhibits excellent durability when subjected to external mechanical impact, friction and wear. At the same time, corundum has high chemical stability and can resist the corrosion of various acids, bases and corrosive gases. This allows the sensor to work stably for a long time in chemically corrosive environments and is not easily affected by chemicals.

[0018] Embodiment

[0019] On the basis of the technical scheme of embodiment one, the transverse axis of the ellipsoidal micro-bubble 4 is 72.42um, the longitudinal axis is 77.73um, and the minimum wall thickness of the ellipsoidal micro-bubble 4 and the middle recess of the double-tapered section 3 is 2.2um.

[0020] Embodiment

[0021] On the basis of the technical scheme of embodiment one, the transverse axis of the ellipsoidal micro-bubble 4 is 73.42um, the longitudinal axis is 78.73um, and the minimum wall thickness of the ellipsoidal micro-bubble 4 and the middle recess of the double-tapered section 3 is 1.2um.

Claims

1. An optical fiber temperature sensor for use in a high magnetic field environment, characterized by: The optical fiber temperature sensor for strong magnetic field environment is composed of a single-mode optical fiber (1) and a corundum sleeve (2), the middle of the single-mode optical fiber (1) is a biconical section (3), an ellipsoidal micro-bubble (4) is embedded in the middle recess of the biconical section (3), and the ellipsoidal micro-bubble (4) is in the same horizontal plane as a fiber core (6); the corundum sleeve (2) is sleeved on the biconical section (3), and the two ends of the corundum sleeve (2) are fixed on the single-mode optical fiber (1) by high-temperature-resistant inorganic glue (5).

2. The optical fiber temperature sensor for use in a high magnetic field environment according to claim 1, characterized by: The transverse axis of the ellipsoidal micro-bubble (4) is 71.42um-73.42um, the longitudinal axis is 76.73um-78.73um, and the minimum wall thickness of the ellipsoidal micro-bubble (4) and the middle recess of the biconical section (3) is 1.2um-3.2um.

3. The optical fiber temperature sensor for use in a high magnetic field environment according to claim 2, characterized by: The transverse axis of the ellipsoidal micro-bubble (4) is 71.42um, the longitudinal axis is 76.73um, and the minimum wall thickness of the ellipsoidal micro-bubble (4) and the middle recess of the biconical section (3) is 3.2um.

4. The optical fiber temperature sensor for use in a high magnetic field environment according to claim 2, characterized by: The transverse axis of the ellipsoidal micro-bubble (4) is 72.42um, the longitudinal axis is 77.73um, and the minimum wall thickness of the ellipsoidal micro-bubble (4) and the middle recess of the biconical section (3) is 2.2um.

5. The optical fiber temperature sensor for use in a high magnetic field environment according to claim 2, characterized by: The transverse axis of the ellipsoidal micro-bubble (4) is 73.42um, the longitudinal axis is 78.73um, and the minimum wall thickness of the ellipsoidal micro-bubble (4) and the middle recess of the biconical section (3) is 1.2um.

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