CN220322585U

CN220322585U - Temperature sensor

Info

Publication number: CN220322585U
Application number: CN202321927277.XU
Authority: CN
Inventors: 师振江; 高杰; 黄娟; 李昂
Original assignee: Beijing Tongwei Technology Co ltd
Current assignee: Beijing Tongwei Technology Co ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2024-01-09
Anticipated expiration: 2033-07-20

Abstract

The application relates to a temperature sensor belongs to the technical field of sensor, and it includes the outer tube, is provided with interior sleeve pipe in the outer tube, is provided with fiber bragg grating in the interior sleeve pipe, and interior sleeve pipe internal fixation has glass solder, and glass solder is provided with two, and two glass solder sets up respectively at the both ends of sleeve pipe including, and fiber bragg grating's both ends run through two glass solder respectively, and fiber bragg grating and glass solder fixed connection, this application has the fixed firm effect to fiber bragg grating.

Description

Temperature sensor

Technical Field

The application relates to the technical field of sensors, in particular to a temperature sensor.

Background

The temperature sensor is a sensor capable of sensing temperature and converting the temperature into a usable output signal, the temperature sensor is internally provided with a fiber bragg grating, the fiber bragg grating has the advantages which are incomparable with those of other sensors, and most of the fiber bragg gratings are fixed by using glue when being fixed in the existing temperature sensor.

In view of the above-mentioned related art, the inventors consider that the fiber grating is fixed by means of gluing, the tackiness of the glue is easily affected by external temperature, the tackiness is easily lost, and the fiber grating is not firmly fixed.

Disclosure of Invention

In order to fix the fiber grating firmly, the application provides a temperature sensor.

The application provides a temperature sensor adopts following technical scheme:

the temperature sensor comprises an outer sleeve, an inner sleeve is arranged in the outer sleeve, an optical fiber grating is arranged in the inner sleeve, glass solders are fixedly connected in the inner sleeve, two glass solders are respectively clamped at two ends of the inner sleeve, two ends of the optical fiber grating respectively penetrate through the two glass solders, and the optical fiber grating is fixedly connected with the glass solders.

Through adopting above-mentioned technical scheme, utilize glass solder to fix fiber grating, replaced sticky mode, glass solder's intensity is high, and stability is high, and glass solder is difficult to receive outside temperature's influence simultaneously to realized the fixed firm effect of fiber grating.

Optionally, both ends of the outer sleeve are inserted and matched with a protective sleeve, and the protective sleeve is sleeved on the fiber bragg grating.

Through adopting above-mentioned technical scheme, the protective sheath pipe plays the guard action to fiber grating, and the protective sheath makes fiber grating be difficult for receiving external influence simultaneously, has realized improving the effect of sensor measurement accuracy.

Optionally, sealing layers are arranged on opposite sides of the two protection sleeves.

By adopting the technical scheme, the two ends of the inner sleeve are plugged, so that the fiber bragg grating in the inner sleeve is not easy to be influenced by the outside, and the effect of improving the measuring precision of the sensor is realized.

Optionally, the sealing layer is silica gel.

Optionally, the sealing layer is wrapped around the end of the protective sleeve extending into the inner sleeve.

Through adopting above-mentioned technical scheme, make between protective casing and the interior sleeve pipe be interference fit through the sealing layer to make protective casing be difficult for breaking away from interior sleeve pipe, realized the fixed effect to protective casing.

Optionally, notches are formed at two ends of the inner sleeve, and end walls of the notches are used for resisting glass solder.

By adopting the technical scheme, the glass solder is placed at the notch of the inner sleeve, so that the effect of fixing the glass solder, the inner sleeve and the fiber grating by a worker is realized.

Optionally, the fiber grating is in a tight state.

By adopting the technical scheme, the fiber bragg grating is pretensioned to a tight state, so that the fiber bragg grating is not easy to be abutted with the inner wall of the inner sleeve, and the effect of further improving the measuring precision of the sensor is realized.

Optionally, the outer sleeve and the inner sleeve are sleeves processed from stainless steel materials.

By adopting the technical scheme, the temperature sensor relies on the thermal expansion of the outer sleeve and the inner sleeve to measure, and the sensitivity is higher because the thermal expansion coefficient of the stainless steel tube is high.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the fiber bragg grating is fixed through glass solder, so that the fiber bragg grating is high in strength and stability, and is pretensioned to a tight state, so that the fiber bragg grating is not easy to abut against the inner wall of the inner sleeve, the measurement accuracy is improved, and the diameters of the inner sleeve and the outer sleeve can be reduced;

2. the influence of the outside on the fiber bragg grating is reduced through the protective sleeve and the sealing layer, so that the measurement accuracy is improved.

Drawings

FIG. 1 is a schematic diagram of a temperature sensor according to an embodiment of the present application;

fig. 2 is a partial cross-sectional view showing an internal structure of a temperature sensor according to an embodiment of the present application.

In the figure, 1, an outer sleeve; 2. an inner sleeve; 21. a notch; 3. an optical fiber grating; 4. glass solder; 5. a protective sleeve; 6. and (3) a sealing layer.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-2.

The embodiment of the application discloses a temperature sensor.

Referring to fig. 1 and 2, a temperature sensor includes an outer sleeve 1, an inner sleeve 2 is disposed in the outer sleeve 1, the inner sleeve 2 and the outer sleeve 1 are made of stainless steel materials, an optical fiber grating 3 is disposed in the inner sleeve 2, the optical fiber grating 3 is in a tight state, and the optical fiber grating 3 is not in contact with the inner wall of the inner sleeve 2.

After the optical fiber grating 3 is pretensioned to a tense state by a worker, the optical fiber grating 3 is fixed in the inner sleeve 2. During actual measurement, the staff can change the materials of the inner sleeve 2 and the outer sleeve 1 according to actual requirements, so that the sensitivity of the temperature sensor is adjusted.

Referring to fig. 2, notches 21 are formed at both ends of the inner sleeve 2, and one end of the two notches 21 away from each other penetrates through the end surfaces of both ends of the inner sleeve 2.

Referring to fig. 2, the inner sleeve 2 is provided with glass solder 4 at the notch 21, the glass solder 4 is an electric vacuum glass composed of molybdenum group, platinum group and other special components, the glass solder 4 is fixedly connected with the inner wall of the inner sleeve 2, two ends of the fiber grating 3 respectively penetrate through the two glass solders 4, and the fiber grating 3 is fixedly connected with the glass solder 4.

The staff melts the glass solder 4 and then places the melted glass solder 4 at the notch 21 of the inner sleeve 2, then the fiber bragg grating 3 passes through the glass solder 4, and the fiber bragg grating 3 is fixed inside the inner sleeve 2 after the glass solder 4 is cooled and molded.

Referring to fig. 2, two ends of the outer sleeve 1 are provided with protection sleeves 5, one end of each protection sleeve 5 is in plug-in fit with the outer sleeve 1, the end of each protection sleeve 5 extends into the outer sleeve 1, two ends of the fiber bragg grating 3 respectively penetrate through the two protection sleeves 5, and the fiber bragg grating 3 is in butt joint with the inner wall of each protection sleeve 5.

Referring to fig. 2, a sealing layer 6 is arranged in the outer sleeve 1, two sealing layers 6 are arranged on opposite sides of two protection sleeves 5, the sealing layers 6 are wrapped at the end parts of the protection sleeves 5, and silica gel is selected as the sealing layers 6.

The protection sleeve 5 and the sealing layer 6 isolate external influences, so that the interference of the external influences on the fiber bragg grating 3 in the inner sleeve 2 is reduced, and the measurement accuracy of the sensor is improved.

The implementation principle of the temperature sensor in the embodiment of the application is as follows: the fiber grating 3 is pre-tensioned to a tight state, and then the fiber grating 3 is fixed inside the inner sleeve 2 through the glass solder 4, and simultaneously the interference of external influence is reduced by the protection sleeve 5 and the sealing layer 6. Through the structure, the effect of improving the measuring precision of the sensor is realized.

The embodiments of the present utility model are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. A temperature sensor, characterized by: including outer tube (1), be provided with interior sleeve pipe (2) in outer tube (1), be provided with fiber bragg grating (3) in interior sleeve pipe (2), fixedly connected with glass solder (4) in interior sleeve pipe (2), glass solder (4) are provided with two, and two glass solder (4) card respectively establish in the both ends of sleeve pipe (2), and two glass solder (4) are run through respectively at the both ends of fiber bragg grating (3), and fiber bragg grating (3) and glass solder (4) fixed connection.

2. A temperature sensor according to claim 1, wherein: both ends of the outer sleeve (1) are inserted and matched with the protective sleeve (5), and the protective sleeve (5) is sleeved on the fiber bragg grating (3).

3. A temperature sensor according to claim 2, wherein: and sealing layers (6) are arranged on the opposite sides of the two protection sleeves (5).

4. A temperature sensor according to claim 3, wherein: the sealing layer (6) is silica gel.

5. A temperature sensor according to claim 3, wherein: the sealing layer (6) is wrapped at the end part of the protection sleeve (5) extending into the inner sleeve (2).

6. A temperature sensor according to claim 1, wherein: both ends of the inner sleeve (2) are provided with notches (21), and the end walls of the notches (21) resist the glass solder (4).

7. A temperature sensor according to claim 1, wherein: the fiber bragg grating (3) is in a tight state.

8. A temperature sensor according to claim 1, wherein: the outer sleeve (1) and the inner sleeve (2) are sleeves processed by stainless steel materials.