Integrated high-precision fluorescent optical fiber temperature sensor

Abstract

The utility model discloses an integrated high-precision fluorescent optical fiber temperature sensor, which comprises a temperature sensor body, a demodulation module and a communication line, and is characterized in that the demodulation module comprises a shell, a demodulation circuit board and an optical module, the temperature sensor body comprises a transmission optical fiber, a temperature sensing probe arranged in one end of the transmission optical fiber and an optical fiber connector arranged at the other end of the transmission optical fiber, the optical fiber connector is installed on the shell and fixedly connected with the optical module, and one end of the communication line is connected with the demodulation circuit board. Through the arrangement of the temperature sensor body and the demodulation module, optical signals of the temperature measurement probe are directly demodulated, temperature information is output, optical fiber loss is small, the temperature measurement tool is high in reliability, the temperature sensor body and the demodulation module are permanently fixed, optical path butt joint is calibrated in a one-to-one mode before fixing, demodulation consistency is good, and temperature measurement precision is high. The device is simple, portable, diversified in interface form and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of fluorescent optical fiber temperature measurement, in particular to an integrated high-precision fluorescent optical fiber temperature sensor. Background Art

[0002] Fluorescent fiber temperature sensing technology is a temperature measurement technology based on the principle that rare earth fluorescent materials, after being stimulated by light of a certain wavelength, radiate fluorescence energy that decays exponentially, and the decay time constant varies according to the temperature. After years of research and development, this technology has been applied in many fields. Due to the inherent characteristics of fluorescent fiber sensing technology, when designing a temperature measurement device based on this technology, it is often necessary to design two parts: the temperature sensor body and the demodulation device. The demodulation device outputs an excitation light source, which is transmitted to the fluorescent fiber temperature sensor through the optical fiber. The fluorescence generated by the excitation is then transmitted back to the demodulation module through the optical fiber. The demodulation module directly displays the temperature or connects to other display devices for temperature display. In order to facilitate the layout of the sensor, most fluorescent fiber temperature measurement systems on the market are designed with sensors and demodulation modules separately; when measuring temperature, the temperature sensor is connected to the demodulation module through an optical fiber connector for optical signal transmission and temperature demodulation.

[0003] We noticed that although such a design facilitates the interchangeability of temperature sensors, it affects the temperature measurement accuracy. When the temperature sensor and demodulator are plugged in and replaced through the optical fiber interface, the optical fiber at both ends of the optical fiber interface changes, causing the optical path structure to change each time, deviating from the pre-calibrated optical path structure, and reducing the temperature measurement accuracy. Fixed connection between the temperature sensor and the demodulator module and the display device is not conducive to replacement and carrying of the sensor after damage. Specifically, there are the following disadvantages:

[0004] 1. The temperature sensor and demodulation module are prone to compatibility issues. Each time the temperature is plugged in and out through the optical fiber interface, the temperature will fluctuate within a certain range, and the temperature measurement accuracy is not high. After replacing the temperature sensor connected to the demodulation module, the temperature measurement consistency is affected;

[0005] 2. The plugging and unplugging of the optical fiber interface will introduce more interference and light source loss. For example, if the optical interface of the sensor is dirty, dust, and water vapor will affect the optical signal and affect the temperature measurement accuracy.

[0006] 3. In a temperature measurement system where the temperature sensor and demodulation module are connected via optical fiber, if the connection fails, the temperature sensor and functional equipment need to be repaired or replaced separately, increasing operation and maintenance costs and time costs.

[0007] Therefore, it is particularly important to design an integrated high-precision fluorescent fiber optic temperature sensor to solve the above-mentioned defects. Utility Model Content

[0008] To solve the problem of low temperature measurement accuracy and susceptibility to interference in the traditional fluorescence temperature measurement system in the above-mentioned background technology, the purpose of the present utility model is to provide an integrated high-precision fluorescence optical fiber temperature sensor. The temperature sensor and the demodulation module are integrally designed, and the optical paths are calibrated one by one, with high temperature measurement accuracy, simple and portable overall structure, and easy to use and replace.

[0009] To achieve the above purpose, the present utility model provides the following technical solutions:

[0010] An integrated high-precision fluorescence optical fiber temperature sensor, comprising a temperature sensor body, a demodulation module, and a communication line. The demodulation module includes a housing, a demodulation circuit board and an optical module installed inside the housing. The temperature sensor body includes a transmission optical fiber, a temperature sensing probe disposed inside one end of the transmission optical fiber, and an optical fiber connector disposed at the other end of the transmission optical fiber. The optical fiber connector is installed on the housing and fixedly connected to the optical module. One end of the communication line is connected to the demodulation circuit board.

[0011] As a preferred solution of the present utility model, the temperature sensor body is integrally encapsulated.

[0012] As a preferred solution of the present utility model, the temperature sensor body and the demodulation module are integrally designed, and the optical paths of the optical module in the demodulation module are calibrated one by one.

[0013] As a preferred solution of the present utility model, the communication line includes a transmission line, an input electrical connector fixedly connected to one end of the transmission line, and an output electrical connector fixedly connected to the other end of the transmission line. The input electrical connector is installed on the housing and electrically connected to the demodulation circuit board.

[0014] As a preferred solution of the present utility model, the output electrical connector is one of a USB interface, a 232 interface, and an RS485 interface.

[0015] As a preferred solution of the present utility model, the housing includes a bottom cover and an upper cover, and the bottom cover and the upper cover are fixedly connected by multiple groups of combined buckles.

[0016] As a preferred solution of the present utility model, after the bottom cover and the upper cover are fixed, two through holes are formed at both ends of the housing, and the optical fiber connector and the input electrical connector are respectively installed in the two through holes.

[0017] As a preferred solution of the present utility model, a plurality of bayonets are provided inside the bottom cover, the demodulation circuit board is provided with reserved fixing holes, and the demodulation circuit board and the bottom cover are fixed by the reserved fixing holes and the bayonets, and the optical module is fixed on the demodulation circuit board.

[0018] Compared with the prior art, the beneficial effects of the present utility model are:

[0019] 1. The temperature sensor body and the demodulation module of the present utility model directly demodulate the optical signal of the temperature measurement probe to output temperature information, with small optical fiber loss and high reliability in temperature measurement.

[0020] 2. In the present utility model, the temperature sensor body and the demodulation module are permanently fixed. Before fixation, the optical path docking is pre-calibrated one-to-one, resulting in good demodulation consistency and high temperature measurement accuracy.

[0021] 3. The device of the present utility model is simple, portable, has various interface forms, and a wide range of applications. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of an integrated high-precision fluorescence optical fiber temperature sensor;

[0023] Figure 2 It is a schematic diagram of the split structure of the upper cover of an integrated high-precision fluorescence optical fiber temperature sensor;

[0024] Figure 3 It is a schematic diagram of the structure of the second embodiment of an integrated high-precision fluorescence optical fiber temperature sensor;

[0025] Figure 4 It is a schematic diagram of the structure of the third embodiment of an integrated high-precision fluorescence optical fiber temperature sensor.

[0026] In the figure: A, temperature sensor body; B, demodulation module; C, communication line; 1, temperature sensing probe; 2, transmission optical fiber; 3, optical fiber connector; 4, housing; 401, bottom cover; 402, upper cover; 403, combined buckle; 404, bayonet; 405, through hole; 5, demodulation circuit board; 6, optical module; 7, input electrical connector; 8, transmission line; 9, output electrical connector. Specific Embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Embodiment:

[0029] Please refer to Figure 1 - Figure 2, this embodiment provides an integrated high-precision fluorescence optical fiber temperature sensor, which includes a temperature sensor body A, a demodulation module B, and a communication line C. The demodulation module B is used for temperature demodulation. The demodulation module B includes a housing 4, a demodulation circuit board 5 and an optical module 6 installed inside the housing 4. The temperature sensor body A includes a transmission optical fiber 2, a temperature sensing probe 1 arranged inside one end of the transmission optical fiber 2, and an optical fiber connector 3 arranged at the other end of the transmission optical fiber 2. The optical fiber connector 3 is installed on the housing 4 and fixedly connected to the optical module 6. The communication line C is used to transmit the temperature measured by the temperature sensor to a display device or other functional devices and transmit electrical energy. One end of the communication line C is connected to the demodulation circuit board 5. Among them, the temperature sensor body A is integrally encapsulated, and the temperature sensor body A and the demodulation module B are integrally designed. The optical paths of the optical modules 6 in the demodulation module B are calibrated one by one, and the internal optical paths of each optical module 6 are individually debugged to improve the optical path coupling accuracy. When in use, the temperature sensing probe 1 is contacted with the temperature measurement point for temperature measurement. The transmission optical fiber 2 is used for optical signal transmission between the demodulation module B and the temperature sensing probe 1. The optical fiber connector 3 docks the optical path of the transmission optical fiber 2 with the optical path of the optical module 6. Through the provided temperature sensor body A and the demodulation module B, the optical signal of the temperature measurement probe 1 is directly demodulated to output temperature information. The optical fiber loss is small, and the temperature measurement has high reliability. The temperature sensor body A and the demodulation module B are permanently fixed. Before fixing, the optical path docking is pre-calibrated one by one, and the demodulation consistency is good, and the temperature measurement accuracy is high.

[0030] In this embodiment, as Figure 1 and Figure 2 shown, the communication line C includes a transmission line 8, an input electrical connector 7 fixedly connected to one end of the transmission line 8, and an output electrical connector 9 fixedly connected to the other end of the transmission line 8. The output electrical connector 9 is connected to other functional devices, such as a computer, etc. The input electrical connector 7 is installed on the housing 4 and electrically connected to the demodulation circuit board 5. While the communication line C transmits the temperature demodulated by the demodulation module B to the functional device, it transmits electrical energy from the functional device to supply power to this device.

[0031] In this embodiment, as Figure 1 and Figure 2 shown, the output electrical connector 9 adopts a USB interface. In other embodiments, as Figure 3 and Figure 4 shown, the output electrical connector 9 can be different forms of interfaces such as a 232 interface, an RS485 interface, etc. The output electrical connector 9 has a variety of implementation methods, which are suitable for different interfaces of functional devices. The device is simple and portable, the interface form is diverse, and the applicable range is wide.

[0032] In this embodiment, as Figure 2As shown in the figure, the housing 4 includes a bottom cover 401 and an upper cover 402. The bottom cover 401 and the upper cover 402 are fixedly connected by multiple groups of combined fasteners 403. The combined fasteners 403 include the combined fasteners inside the upper cover 402 and the combined buckles inside the bottom cover 401. In this embodiment, three pairs of combined fasteners 403 are provided, and the number can be increased or decreased according to actual needs in other embodiments. When it is necessary to fix the upper cover 402 and the bottom cover 401, after aligning the combined fasteners of the upper cover 402 with the combined buckles of the bottom cover 401, applying a covering pressure can achieve the snap-fitting and fixing of the bottom cover 401 and the upper cover 402. A sealing ring is provided at the connection between the bottom cover 401 and the upper cover 402 to improve the sealing performance. The assembly is convenient and the use is easy.

[0033] In this embodiment, as Figure 2 shown, after the bottom cover 401 and the upper cover 402 are fixed, two through holes 405 are formed at both ends of the housing 4. The optical fiber connector 3 and the input electrical connector 7 are respectively installed in the two through holes 405. The through holes 405 are the reserved positions for the optical fiber connector 3 and the input electrical connector 7 to be connected to the internal components of the demodulation module B.

[0034] In this embodiment, as Figure 2 shown, multiple buckles 404 are provided inside the bottom cover 401. The demodulation circuit board 5 is provided with reserved fixing holes. The demodulation circuit board 5 and the bottom cover 401 are fixed through the reserved fixing holes and the buckles 404. It can be fixed by snap-fitting or by bolts. The optical module 6 is fixed on the demodulation circuit board 5, which is convenient for the assembly of the demodulation circuit board 5 and the optical module 6 with the housing 4.

[0035] Working principle: When in use, first connect the input electrical connector 9 to the functional device to power on this device, and then place the temperature sensing probe 1 at the temperature measurement point to contact the temperature measurement point. At this time, the demodulation module B outputs excitation light to excite the fluorescent substance to emit light. After stopping the excitation light, the light emitted by the fluorescent substance is transmitted to the demodulation module B through the transmission optical fiber 2 and the optical fiber connector 3 for temperature demodulation. The demodulated temperature is transmitted to the functional device through the communication line C for display. The optical module 6 in the temperature sensor body A and the demodulation module B of this device adopts a permanently fixed design. The optical paths of the temperature sensor body A and the optical module 6 are calibrated before fixing, and the optical path docking accuracy is high. The whole device of this device is simple and portable, and the electrical connector 9 can be designed in various forms, which is convenient for connecting to different hardware ports, and has a wide range of applications.

[0036] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. An integrated high-precision fluorescent optical fiber temperature sensor, characterized in that: The invention comprises a temperature sensor body (A), a demodulation module (B) and a communication line (C); the demodulation module (B) comprises a housing (4) and a demodulation circuit board (5) and an optical module (6) installed inside the housing (4); the temperature sensor body (A) comprises a transmission optical fiber (2), a temperature sensing probe (1) arranged inside one end of the transmission optical fiber (2) and an optical fiber connector (3) arranged at the other end of the transmission optical fiber (2); the optical fiber connector (3) is installed on the housing (4) and fixedly connected to the optical module (6); one end of the communication line (C) is connected to the demodulation circuit board (5).

2. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 1, characterized in that: The temperature sensor body (A) is packaged in an integrated manner.

3. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 2, characterized in that: The temperature sensor body (A) and the demodulation module (B) are designed as an integrated whole, and the optical paths of the optical modules (6) in the demodulation module (B) are calibrated one by one.

4. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 1, characterized in that: The communication line (C) comprises a transmission line (8), an input electrical connector (7) fixedly connected to one end of the transmission line (8), and an output electrical connector (9) fixedly connected to the other end of the transmission line (8); the input electrical connector (7) is mounted on the housing (4) and is electrically connected to the demodulation circuit board (5).

5. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 4, characterized in that: The output electrical connector (9) adopts one of a USB interface, a 232 interface and an RS485 interface.

6. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 4, characterized in that: The housing (4) comprises a bottom cover (401) and an upper cover (402), and the bottom cover (401) and the upper cover (402) are connected and fixed via a plurality of groups of combined buckles (403).

7. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 6, characterized in that: After the bottom cover (401) and the upper cover (402) are fixed, two through holes (405) are formed at both ends of the housing (4), and the optical fiber connector (3) and the input electrical connector (7) are respectively installed in the two through holes (405).

8. The integrated high-precision fluorescent optical fiber temperature sensor according to claim 6, characterized in that: A plurality of bayonet holes (404) are arranged inside the bottom cover (401), the demodulation circuit board (5) is provided with a reserved fixing hole, the demodulation circuit board (5) and the bottom cover (401) are fixed via the reserved fixing hole and the bayonet holes (404), and the optical module (6) is fixed on the demodulation circuit board (5).

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