CN102175276B - Ultralow-temperature high-vacuum fiber sensor probe - Google Patents

Abstract

An ultra-low temperature and high vacuum optical fiber sensor probe, comprising: an optical fiber array; a metal sleeve for positioning the optical fiber array. There is a fiber array fixing hole in the center or inside of the sleeve, which is used for the positioning and welding of the fiber array; a fiber array protection metal sleeve, the fiber array protection metal sleeve is made of valveable material or copper, and is a metal with a female thread at one end. An entity, an optical fiber array protective hole is opened inside the optical fiber array protective metal sleeve, and the optical fiber array passes through the optical fiber array protective hole of the optical fiber array protective metal sleeve.

Description

Ultra-low temperature and high vacuum fiber optic sensor probe

technical field

The invention relates to the technical field of optical fiber sensing, more specifically to an optical fiber sensor probe for sensing under special environmental conditions such as ultra-low temperature and high vacuum, which is a key component for sensing under special environmental conditions.

Background technique

In fiber optic sensing technology, fiber optic arrays are widely used as probes of sensors. One optical fiber in the optical fiber array is used as the transmission of the optical fiber sensing signal, and the other two or more optical fibers are used as the receiving of the sensing signal. Usually, in order to achieve better and more stable sensing and detection effects, the array optical fibers in the fiber optic probe are arranged in a specific way and fixed in a metal or some kind of solid material. At present, this technology has been widely used and recognized in daily sensing and detection, and with the promotion of this technology, some special environmental conditions of ultra-low temperature and high vacuum also require the use of this fiber optic sensor for sensing and detection. However, since the optical fiber in the fiber optic sensor probe itself is made of quartz or plastic, epoxy glue or similar adhesives are often used to provide support and fixation. There is no problem in using this fixing method under daily environmental conditions, but when In the environment of ultra-low temperature and high vacuum, the properties of epoxy glue or similar adhesives will change, which will cause the relative position of the optical fiber array to change, and eventually lead to sensor failure, which limits the performance of optical fiber sensors in this special environmental condition. use below.

Contents of the invention

In order to solve the above problems, the purpose of the present invention is to provide an optical fiber sensor probe that can be used under ultra-low temperature and high vacuum environment conditions. By adopting full metallization technology, the optical fiber is fixed with solder to realize the ultra-low temperature and high vacuum extreme environmental conditions. A fiber optic sensor probe that can be used stably and reliably.

The technical scheme that the present invention solves its technical problem is:

The invention is an ultra-low temperature and high vacuum optical fiber sensor probe, comprising:

an optical fiber array;

An optical fiber array positioning metal sleeve. The optical fiber array positioning metal sleeve is made of valveable material or copper. Positioning and welding of fiber optic arrays;

An optical fiber array protective metal sleeve. The optical fiber array protective metal sleeve is made of valveable material or copper. The optical fiber array protection hole of the optical fiber array protection metal sleeve.

The optical fiber array is composed of a plurality of quartz optical fibers or plastic optical fibers that can be welded after optical fiber metallization at one end. The optical fiber arrays are arranged in parallel or in the form of one optical fiber surrounded by other optical fibers in the middle.

Among them, the shape of the fiber array positioning metal sleeve is a cylinder, or it can be processed into any shape according to the sensing requirements to facilitate cooperation with the sensing system. The shape of the fiber array fixing hole is consistent with the shape of the fiber array, which is clearance fit The surface of the hole is gold-plated.

Wherein the metallized end of the optical fiber array is put into the optical fiber array fixing hole of the optical fiber array positioning metal sleeve and fixed by soldering tin.

Among them, the shape of the optical fiber array protective metal sleeve is a cylinder, or it can be processed into any shape according to the sensing requirements to facilitate cooperation with the sensing system.

The optical fiber array passes through the optical fiber array protection hole of the optical fiber array protection metal sleeve, and the optical fiber array is fixed with adhesive, so that the optical fiber array is effectively supported and protected.

Wherein the binder is epoxy glue or UV curing glue or black glue.

The optical fiber array positioning metal sleeve and the optical fiber array protective metal sleeve are fixed together through the connection of the male thread and the female thread, or are welded by laser to further improve the reliability of the sensor probe.

The beneficial effects of the present invention are: adopting the fully metallized and fixedly welded optical fiber sensor probe can maintain the stability of the structure under ultra-low temperature and high vacuum conditions, thereby meeting the sensing and detection requirements under special environmental conditions, and finally realizing The purpose of fiber optic sensing detection.

Description of drawings

In order to further illustrate the technical content of the present invention, the present invention will be further described below in conjunction with accompanying drawing and embodiment, wherein:

Fig. 1 is a top view of the ultra-low temperature and high vacuum optical fiber sensor probe of the present invention.

Fig. 2 is a side sectional view of the ultra-low temperature and high vacuum optical fiber sensor probe of the present invention.

Detailed ways

Please refer to Fig. 1 and Fig. 2, a kind of ultra-low temperature and high vacuum optical fiber sensor probe of the present invention, comprising:

An optical fiber array 1, one end of the optical fiber used in the optical fiber array 1 needs to undergo optical fiber metallization treatment in advance, and this treatment method can form a metal coating on the surface of the optical fiber. The metal coating can be gold, silver or chrome. The metal The cladding can fix the silica optical fiber or plastic optical fiber that cannot be soldered originally by welding, and arrange and clamp the treated optical fiber in parallel through a special clamp or in the form of one optical fiber surrounded by other optical fibers in the middle;

An optical fiber array positions the metal sleeve 2. The optical fiber array positions the metal sleeve 2 as a metal entity. The metal entity can be a valveable material or copper. If the valveable material is selected, it needs to be gold-plated on the surface after processing to facilitate welding. The shape can be processed into a cylinder, or it can be processed into any shape according to the sensing requirements to facilitate cooperation with the sensing system. Through precision machining, a male thread 22 is processed at one end of the metal entity, and the shaft center or inside of the metal entity Process the fiber array fixing hole 21 according to the distribution and shape of the fiber array 1, the fiber array fixing hole 21 is a through hole and the fiber array 1 is a clearance fit, and the metallized end of the fiber array 1 is put into the fiber array through a special clamp for positioning The fiber array fixing hole 21 of the metal sleeve 2 is fixed with solder, and then the common end faces of the optical fiber array 1 and the optical fiber array positioning metal sleeve 2 are polished by a step-by-step polishing method to form an end face with a high degree of smoothness;

An optical fiber array protective metal sleeve 3, which is machined into a metal entity with a female screw thread 31 at one end, and its shape can be processed into a cylinder, or can be processed into any shape according to the sensing requirements to facilitate communication with Cooperate with the sensing system, the axial direction or inside of the optical fiber array protection metal sleeve 3 is machined to process a through hole of an optical fiber array protection hole 32, the diameter of the optical fiber array protection hole 32 is larger than the peripheral size of the optical fiber array, Pass the unmetallized end of the fiber array 1 through the fiber array protection hole 32 of the fiber array protection metal sleeve 3, and then pass the female thread 31 of the fiber array protection metal sleeve 3 and the male thread 22 of the fiber array positioning metal sleeve 2 through The threaded connection fixes the optical fiber array positioning metal sleeve 2 and the optical fiber array protective metal sleeve 3 together, which can be welded and reinforced by laser to further improve the reliability of the sensor probe. Finally, the adhesive 4 is injected into the optical fiber array protection hole 32 and the adhesive is cured according to the curing conditions, so that the optical fiber array 1 is effectively supported and protected in the optical fiber array protection hole 32. The adhesive 4 can be epoxy glue Or UV curing glue or black glue.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (7)

1. An ultra-low temperature and high vacuum fiber optic sensor probe, comprising: an optical fiber array; An optical fiber array positioning metal sleeve. The optical fiber array positioning metal sleeve is made of valveable material or copper. The positioning and welding of the optical fiber array, the shape of the optical fiber array positioning metal sleeve is a cylinder, or processed into other shapes according to the sensing requirements to facilitate cooperation with the sensing system. The shape of the optical fiber array fixing hole is consistent with the shape of the optical fiber array, for Clearance fit, gold-plated on the surface of the fiber array fixing hole; An optical fiber array protective metal sleeve. The optical fiber array protective metal sleeve is made of valveable material or copper. The optical fiber array protection hole of the optical fiber array protection metal sleeve. 2. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 1, wherein the optical fiber array is composed of a plurality of quartz optical fibers or plastic optical fibers that can be welded through optical fiber metallization at one end, and the optical fiber arrays are arranged in parallel or with one optical fiber in the Arrange in the form of other optical fibers in the middle. 3. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 1, wherein the metallized end of the optical fiber array is fixed with solder after being put into the optical fiber array fixing hole of the optical fiber array positioning metal sleeve. 4. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 1, wherein the outer shape of the optical fiber array protective metal sleeve is a cylinder, or processed into other shapes according to the sensing requirements to facilitate cooperation with the sensing system. 5. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 1, wherein the optical fiber array passes through the optical fiber array protection hole of the optical fiber array protection metal sleeve, and the optical fiber array is fixed with an adhesive, so that the optical fiber array is effectively supported and Protect. 6. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 4, wherein the adhesive is epoxy glue or ultraviolet curing glue or black glue. 7. The ultra-low temperature and high vacuum optical fiber sensor probe according to claim 1, wherein the optical fiber array positioning metal sleeve and the optical fiber array protection metal sleeve are fixed together through a male thread and a female thread connection, or are welded with a laser to further improve the sensor probe. reliability.

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