Intelligent sensing optical fiber sensing equipment of control system

Abstract

The invention discloses intelligent sensing optical fiber sensing equipment for a control system. The intelligent sensing optical fiber sensing equipment comprises an optical fiber demodulation module and a multi-parameter optical fiber sensor, the optical fiber demodulation module comprises a shell formed by packaging a top cover and a base, an acquisition board assembly and a main control board assembly, the acquisition board assembly and the main control board assembly are integrated in the shell, and a laser, a DAC drive circuit, a TEC temperature control circuit, a PD detector, an ADC drive circuit and a mainboard docking port are integrated on the acquisition board assembly. An SOC system, an SOC power supply circuit, a board-to-board interface, an external interface circuit and an analog circuit are integrated on the main control board assembly; the multi-parameter optical fiber sensor comprises an optical fiber temperature sensor, an optical fiber strain sensor and an optical fiber magnetic field sensor. The optical fiber sensing equipment is based on a multi-parameter optical fiber sensor, core index sensing data of each key single machine in a cabin can be obtained in real time, real-time detection and high-speed transmission of force, heat, magnetism and other environment excitation information of key equipment and sensitive units are achieved, the working environment of a rocket control system is comprehensively mastered, and the health state of a rocket is accurately evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to optical fiber sensing technology, and in particular to a control system intelligent sensing optical fiber sensing equipment. BACKGROUND

[0002] Optical fiber sensing technology is a new type of sensing technology developed in the 1970s, which modulates the intensity, phase, wavelength and polarization state of light transmitted in the optical fiber and monitors these changes to measure temperature, strain, pressure, acoustic vibration, angular velocity and other parameters. In recent years, due to the advantages of small size, light weight, high measurement sensitivity, strong multiplexing capability, anti-electromagnetic interference, easy embedding in material, etc., optical fiber sensors have attracted widespread attention and begun to be applied in aerospace field.

[0003] Under the trend of commercial aerospace development, reusable rockets require the control system to have big data sensing ability and intelligent analysis and processing ability, and new sensing device and matching sensor are needed to collect cabin structure and in-cabin control device working environment excitation information during the flight of the reusable rocket, so as to realize real-time detection and high-speed transmission of force, heat, magnetic environment excitation information of key devices and sensitive units of the launch vehicle. Through research on optical fiber sensing technology, launch and on-orbit fault monitoring of the rocket control system, and combination with ground maintenance and support stage, the goal of health management of the reusable rocket can be achieved. SUMMARY

[0004] In view of the above technical problems, the present application provides a control system intelligent sensing optical fiber sensing equipment. The optical fiber sensing equipment can obtain core index sensing data of each key unit in the cabin in real time based on the multi-parameter optical fiber sensor according to the real-time state information sensing requirement of the rocket control system and the environmental characteristics of each key component, realize real-time detection and high-speed transmission of force, heat, magnetic environment excitation information of key devices and sensitive units, and comprehensively master the working environment of the rocket control system and accurately evaluate the health status of the rocket.

[0005] A control system intelligent sensing optical fiber sensing equipment includes an optical fiber demodulation module and a multi-parameter optical fiber sensor.

[0006] The optical fiber demodulation module includes a shell encapsulated by a top cover and a base, and a collection board assembly and a master control board assembly integrated in the shell. The collection board assembly is integrated with a laser, a DAC driving circuit, a TEC temperature control circuit, a PD detector, an ADC driving circuit and a main board interface. The master control board assembly is integrated with a SOC system, a SOC power circuit, a board-to-board interface, an external interface circuit and an analog circuit.

[0007] The multi-parameter optical fiber sensor includes an optical fiber temperature sensor, an optical fiber strain sensor and an optical fiber magnetic field sensor.

[0008] As the preferred of the above technical solution, the electrical interface of the optical fiber demodulation module adopts a backplane connector, containing two gigabit Ethernet interfaces, one of which is used for optical fiber sensing data uploading, and the other is used for data debugging of the optical fiber demodulation module.

[0009] As the preferred of the above technical solution, the optical fiber demodulation module adopts a stacked plate design, with the main control part and analog acquisition designed on a separate PCBA, connected through a board-to-board connector, and the optical devices and optical fibers are designed separately in the module outer fiber box, realizing the separation of electrical circuit and optical circuit.

[0010] As the preferred of the above technical solution, the optical fiber temperature sensor contains a fiber grating, a sensing head packaging shell and a protective sleeve, the sensing head packaging shell is made of alumina ceramic material, and the protective sleeve is made of high-strength glass fiber material.

[0011] As the preferred of the above technical solution, the optical fiber strain sensor contains a fiber grating, a substrate structure and a protective sleeve, the substrate structure is made of 305 stainless steel substrate material.

[0012] As the preferred of the above technical solution, the optical fiber magnetic field sensor contains a fiber grating, a magnetostrictive material and a protective sleeve, the magnetostrictive material is Terfenol-D.

[0013] As the preferred of the above technical solution, the fiber gratings used to compose the optical fiber temperature sensor, the optical fiber strain sensor and the optical fiber magnetic field sensor all adopt polyimide coated optical fibers and femtosecond grating writing.

[0014] As the preferred of the above technical solution, the protective sleeves used to compose the optical fiber temperature sensor, the optical fiber strain sensor and the optical fiber magnetic field sensor are all made of high-strength glass fiber material.

[0015] The beneficial effects of the present application are:

[0016] 1. Multi-measurement point, multi-parameter, using femtosecond laser non-destructive grating writing technology, writing grating array on a single optical fiber line, and coating high and low temperature resistant polyimide material to form a large capacity, series, high performance fiber grating sensing core fiber, according to the test requirements, each grating is independently customized to measure the parameters, through the research of micro-sensing structure design and packaging technology, a special optical fiber sensor with small volume, high flexibility and easy operation is developed to meet the narrow space layout in the cabin.

[0017] 2. Integrated high-speed demodulation: Breakthroughs in high-efficiency light source output and high-sensitivity optical signal receiving circuit design technologies enable high-speed demodulation and low-power design of photoelectric signals. Based on optoelectronic integrated platform hardware design technology, highly integrated light source devices, tuning drive circuits, and digital signal processing circuits are used in conjunction with a compact structure design to achieve miniaturized design of photoelectric demodulation hardware. Based on the optimized design of high-speed transmitting and receiving circuits driving lasers and photodetectors, high-speed matching of scanning and detection is achieved. Based on high-speed signal acquisition and multi-channel parallel digital signal processing technology, high-speed dynamic measurement and analysis of fiber optic sensing signals are achieved.

[0018] 3. High-speed interconnection: Develop hardware interfaces to match high-speed SGMII data signals, open up information communication channels between fiber optic sensor data and control systems, and realize data interconnection. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of the structure of the present invention.

[0020] Fig. 2 This is a schematic diagram of the acquisition board assembly.

[0021] Fig. 3 This is a structural diagram of the main control board assembly.

[0022] Fig. 4 This is a schematic diagram of the structure of a multi-parameter fiber optic sensor.

[0023] The attached diagram is labeled as follows: 1-Top cover, 2-Base, 3-Acquisition board assembly, 4-Main control board assembly, 5-Laser, 6-DAC driver circuit, 7-TEC temperature control circuit, 8-PD detector, 9-ADC driver circuit, 10-Main board interface, 11-SOC system, 12-SOC power supply circuit, 13-Board to board interface, 14-External interface circuit, 15-Analog circuit, 16-Fiber optic temperature sensor, 17-Fiber optic strain sensor, 18-Fiber optic magnetic field sensor. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] like Figs. 1 to 4 The control system intelligent sensing fiber optic sensing equipment shown includes a fiber optic demodulation module and a multi-parameter fiber optic sensor.

[0026] The optical fiber demodulation module comprises a shell encapsulated by a top cover 1 and a base 2, and a collection board assembly 3 and a master control board assembly 4 integrated in the shell, the collection board assembly 3 is integrated with a laser 5, a DAC driving circuit 6, a TEC temperature control circuit 7, a PD detector 8, an ADC driving circuit 9 and a main board interface 10, and the master control board assembly 4 is integrated with a SOC system 11, a SOC power supply circuit 12, a board-to-board interface 13, an external interface circuit 14 and an analog circuit 15.

[0027] The multi-parameter optical fiber sensor comprises an optical fiber temperature sensor 16, an optical fiber strain sensor 17 and an optical fiber magnetic field sensor 18.

[0028] In the embodiment, the electrical interface of the optical fiber demodulation module adopts a backplane connector, comprising two gigabit Ethernet interfaces, one of which is used for optical fiber sensing data uploading, and the other is used for data debugging of the optical fiber demodulation single machine.

[0029] In the embodiment, the optical fiber demodulation module adopts a laminated plate design, the master control part and the analog collection are designed by using a piece of independent PCBA respectively, connected through a board-to-board connector, and the optical devices and the optical fiber are laid out in a module outer fiber box, realizing the separation of the circuit and the optical path.

[0030] In the embodiment, the optical fiber temperature sensor 13 comprises a fiber grating, a sensing head encapsulation shell and a protective sleeve, the sensing head encapsulation shell is made of alumina ceramic material, and the protective sleeve is made of high-strength glass fiber material.

[0031] In the embodiment, the optical fiber strain sensor 17 comprises a fiber grating, a base structure and a protective sleeve, and the base structure is made of 305 stainless steel substrate material.

[0032] In the embodiment, the optical fiber magnetic field sensor 18 comprises a fiber grating, a magnetostrictive material and a protective sleeve, and the magnetostrictive material is Terfenol-D.

[0033] In the embodiment, the fiber gratings used to constitute the optical fiber temperature sensor 16, the optical fiber strain sensor 17 and the optical fiber magnetic field sensor 18 are all polyimide coated optical fibers and femtosecond grating writing gratings.

[0034] In the embodiment, the protective sleeves used to constitute the optical fiber temperature sensor 16, the optical fiber strain sensor 17 and the optical fiber magnetic field sensor 18 are all made of high-strength glass fiber material

[0035] During operation of the optical fiber sensing equipment, the optical fiber demodulation module uses the tunable laser 5 (TLS) in the acquisition board assembly 3 as a driving light source, outputs a narrow linewidth laser with adjustable wavelength, scans the gratings of the external multi-parameter optical fiber sensor after isolation by the transceiver of the PLC, and uses the photodetector to check the reflected light power of the grating in real time, the signal processing system in the main control board uses a time synchronization algorithm to measure the reflected spectrum of the external grating in real time, calculates the characteristic wavelength of each grating, analyzes the parameter values of the corresponding environment, reports the demodulation data to the control system through the data signal interface, and completes a measurement.

[0036] The optical fiber sensing equipment realizes high-speed adjustable narrow linewidth laser output of the optical fiber demodulation single machine, has high integration, has good transceiver isolation, realizes high sensitivity of the receiver, does not use any mechanical component to tune the laser, the system optical path is simple, the device is mature, and high reliability of the vibration environment is realized based on mature semiconductor devices; the multi-parameter optical fiber sensor has the sensitivity of different parameters such as force, heat and magnetism, has the networking capability of a large-capacity optical fiber grating sensing array, and can realize multi-dimensional and high-quality detection of force, heat and magnetic micro-sensing information of the in-cabin control equipment.

[0037] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control system intelligent sensing fiber optic sensing device, characterized in that: Includes fiber optic demodulation modules and multi-parameter fiber optic sensors; The fiber optic demodulation module includes a housing consisting of a top cover and a base, and an acquisition board assembly and a main control board assembly integrated within the housing. The acquisition board assembly integrates a laser, a DAC driver circuit, a TEC temperature control circuit, a PD detector, an ADC driver circuit, and a motherboard interface. The main control board assembly integrates a SOC system, a SOC power supply circuit, a board-to-board interface, an external interface circuit, and analog circuits. The multi-parameter fiber optic sensor includes a fiber optic temperature sensor, a fiber optic strain sensor, and a fiber optic magnetic field sensor.

2. The intelligent sensing fiber optic sensing equipment for a control system according to claim 1, characterized in that: The external electrical interface of the fiber optic demodulation module adopts a backplane connector, which includes two gigabit Ethernet interfaces. One of the Ethernet interfaces is used for uploading fiber optic sensor data, and the other Ethernet interface is used for data debugging of the fiber optic demodulation unit.

3. The intelligent sensing fiber optic sensing equipment for a control system according to claim 1, characterized in that: The fiber optic demodulation module adopts a stacked board design, with the main control part and analog acquisition part designed on separate PCBAs and connected by board-to-board connectors. The optical components and fiber layout are designed separately in the outer fiber box of the module to achieve separation of circuit and optical path.

4. The intelligent sensing fiber optic sensing equipment for a control system according to claim 1, characterized in that: The fiber optic temperature sensor includes a fiber optic grating, a sensor head enclosure, and a protective sleeve. The sensor head enclosure is made of alumina ceramic material, and the protective sleeve is made of high-strength glass fiber material.

5. The intelligent sensing fiber optic sensing equipment for a control system according to claim 4, characterized in that: The fiber optic strain sensor comprises a fiber optic grating, a substrate structure, and a protective sleeve. The substrate structure is made of 305 stainless steel substrate material.

6. The intelligent sensing fiber optic sensing equipment for a control system according to claim 5, characterized in that: The fiber optic magnetic field sensor comprises a fiber optic grating, a magnetostrictive material, and a protective sleeve. The magnetostrictive material is a terbium-dysprosium-iron alloy, Terfenol-D.

7. The intelligent sensing fiber optic sensing equipment for a control system according to claim 6, characterized in that: The fiber gratings used to compose the fiber optic temperature sensor, fiber optic strain sensor, and fiber optic magnetic field sensor are all made of polyimide-coated fiber and are femtosecond-written gratings.

8. The intelligent sensing fiber optic sensing equipment for a control system according to claim 6, characterized in that: The protective sleeves used to compose the fiber optic temperature sensor, fiber optic strain sensor, and fiber optic magnetic field sensor are all made of high-strength glass fiber material.

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