阅读说明：本技术 一种基于光纤头部探测的光纤探测器 (Optical fiber detector based on optical fiber head detection ) 是由 不公告发明人 于 2019-11-06 设计创作，主要内容包括：本发明涉及一种基于光纤头部探测的光纤探测器,该光纤探测器包括光源、光接收器、分束器、光纤、传感部,光源发出光,经光纤传输到传感部,传感部将光经光纤反射回光接收器,通过检测光接收器所接收到的光信号,以探测传感部周围的环境,传感部包括第一腔体和设置于第一腔体表面的贵金属颗粒,第一腔体为二氧化硅材料,第一腔体与纤芯融化连接。这样一来,会有更多的能量与贵金属颗粒发生作用,当贵金属颗粒周围的环境发生变化时,光接收器探测到的光强度变化大,易于探测。使用时,将第一腔体插入待检测环境即可,设备简单,使用方便。(The invention relates to an optical fiber detector based on optical fiber head detection, which comprises a light source, an optical receiver, a beam splitter, an optical fiber and a sensing part, wherein light is emitted by the light source and transmitted to the sensing part through the optical fiber, the sensing part reflects the light back to the optical receiver through the optical fiber, and detects the surrounding environment of the sensing part by detecting the optical signal received by the optical receiver, the sensing part comprises a first cavity and noble metal particles arranged on the surface of the first cavity, the first cavity is made of silicon dioxide material, and the first cavity is connected with a fiber core in a melting way. Therefore, more energy is reacted with the noble metal particles, and when the environment around the noble metal particles changes, the light intensity detected by the light receiver changes greatly, so that the noble metal particles are easy to detect. During the use, with first cavity insert wait detect the environment can, equipment is simple, convenient to use.)

1. The utility model provides an optical fiber detector based on optical fiber head detects, includes light source, light receiver, beam splitter, optic fibre, sensing portion, the light source the light receiver the one end of optic fibre all is connected with the beam splitter, the other end of optic fibre with sensing portion connects, the light source sends out the light, the warp the beam splitter with optic fibre transmits to sensing portion, sensing portion will pass through the light optic fibre with the beam splitter reflects back light receiver through detecting the light signal that light receiver received to survey sensing portion surrounding environment, its characterized in that, sensing portion includes first cavity and sets up in the noble metal granule on first cavity surface, and first cavity is the silica material, and first cavity melts with the fibre core and is connected.

2. The fiber optic probe based on fiber optic head probing according to claim 1 wherein: and a second cavity is also arranged on the side surface of the first cavity.

3. The fiber optic probe based on fiber optic head probing according to claim 2 wherein: the second cavity is made of silicon dioxide materials.

4. A fiber optic probe based on fiber optic head probing according to claim 3 wherein: the second cavities are asymmetrically distributed along the extension line of the optical fiber.

5. The fiber optic probe based on fiber optic head probing according to claim 4 wherein: the first cavity and the second cavity are spherical.

6. The fiber optic probe based on fiber optic head probing according to claim 5 wherein: the size of the second cavity is smaller than that of the first cavity.

7. The fiber optic probe based on fiber optic head probing according to claim 4 wherein: the first cavity is spherical, and the second cavity is rectangular.

8. An optical fiber probe based on optical fiber head detection according to any one of claims 5 to 7, wherein: the noble metal material is gold or silver.

Technical Field

The invention relates to the field of optical fiber detection, in particular to an optical fiber detector based on optical fiber head detection.

Background

Environmental sensing, such as refractive index sensing of the surrounding environment or concentration sensing of fluids, is involved in various aspects of national economy. The detector based on the optical fiber has the advantages of small size, no influence of an external magnetic field and the like. In recent years, the skilled person has developed a fiber optic probe based on the principles of fiber optic and surface plasmon resonance. Generally, the noble metal particles are disposed outside the core of the optical fiber, and when the environment around the noble metal particles changes, the transmittance of the optical fiber changes. By detecting the change in the transmission coefficient, the change in the environment around the noble metal particle is detected. Since the light source and the detector are disposed at both ends of the optical fiber, the apparatus is complicated; the coupling strength of the noble metal particles to light in the optical fiber is low, and the change in the transmission coefficient is insignificant when the environment around the noble metal particles changes.

Disclosure of Invention

In order to solve the above problems, the present invention provides an optical fiber detector based on optical fiber head detection, the optical fiber detector includes a light source, a light receiver, a beam splitter, an optical fiber, and a sensing portion, one end of the light source, the light receiver, and the optical fiber are all connected to the beam splitter, the other end of the optical fiber is connected to the sensing portion, the light source emits light, which is transmitted to the sensing portion through the beam splitter and the optical fiber, the sensing portion reflects the light back to the light receiver through the optical fiber and the beam splitter, and detects the surrounding environment of the sensing portion by detecting the optical signal received by the light receiver, the optical fiber detector is characterized in that the sensing portion includes a first cavity and noble metal particles arranged on the surface of the first cavity, the first cavity is made of silica material, and the first cavity is connected to the fiber.

Light source, photoreceiver, optic fibre, sensing portion, light source light-emitting, through optical fiber transmission to sensing portion, sensing portion with light reflection back photoreceiver through optic fibre, through detecting the light signal that photoreceiver received to survey the environment around the sensing portion, sensing portion includes first cavity and sets up in the noble metal granule on first cavity surface, and first cavity is the silica material, and first cavity melts with the fibre core and is connected.

Furthermore, a second cavity is arranged on the side surface of the first cavity.

Further, the second cavity is made of silicon dioxide material.

Further, the second cavity is asymmetrically distributed along the extension of the optical fiber.

Still further, the first cavity and the second cavity are spherical.

Further, the size of the second cavity is smaller than the size of the first cavity.

Furthermore, the first cavity is spherical, and the second cavity is rectangular.

Further, the noble metal material is gold or silver.

The invention has the beneficial effects that: the invention provides an optical fiber detector based on optical fiber head detection.A first cavity is arranged at the head of a fiber core and serves as a resonant cavity, so that a large amount of energy is gathered; and precious metal particles are arranged on the surface of the first cavity. Therefore, more energy is acted on the noble metal particles, when the environment around the noble metal particles changes, the coupling condition of the noble metal particles and light changes more correspondingly, and the light intensity detected by the light receiver changes greatly, so that the noble metal particles are easy to detect. During the use, with first cavity insert wait detect the environment can, equipment is simple, convenient to use.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a first schematic diagram of a sensing part of an optical fiber detector based on optical fiber head detection.

Fig. 2 is a second schematic diagram of the sensing part of the optical fiber detector based on the detection of the head part of the optical fiber.

Fig. 3 is a third schematic diagram of the sensing part of the optical fiber detector based on the detection of the head part of the optical fiber.

In the figure: 1. a fiber core; 2. a first cavity; 3. noble metal particles; 4. a second cavity.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.