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1. 发明申请

US20230038018A1 Gas Sensor Probe Having Multipoint Reflection Rectangular Absorption Cell, and Detection Device 有权
公开(公告)号：US20230038018A1
公开(公告)日：2023-02-09
申请号：US17789924
申请日：2019-12-31
申请人： LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCE
发明人： Yanong Ning , Tongyu Liu , Yanfang Li , Guangxian Jin , Bo Cai , Tingting Zhang
IPC分类号： G01N21/39
摘要： A gas sensor probe having multipoint reflection rectangular absorption cell, a VCSEL laser emitter and a detection device. The probe comprises: an upper cover plate, the surface of the upper cover plate being provided with gas diffusion holes, and a metal filtering screen being provided above the gas diffusion holes; a lower cover plate located under the upper cover plate and detachably connected to the upper cover plate, and an electric wire through hole being formed in the bottom of the lower cover plate; a light path module located in an internal space defined by the upper cover plate and the lower cover plate and used for modulating the laser emitter and collecting a detection signal; and an electronic processing circuit board located in the internal space defined by the upper cover plate and the lower cover plate, located below the light path module, electrically connected to the light path module, and used for processing the signal generated from the light path module.

2. 发明授权

US11248952B2 Fiber distributed acoustic sensing system 有权
公开(公告)号：US11248952B2
公开(公告)日：2022-02-15
申请号：US16567339
申请日：2019-09-11
申请人： Laser Institute of Shandong Academy of Science
发明人： Chen Wang , Ying Shang , Wenan Zhao , Chang Li , Bing Cao , Sheng Huang , Jiasheng Ni , Chang Wang
IPC分类号： G01D5/34 , G01H9/00 , G01D5/353
摘要： The present application discloses a fiber distributed acoustic sensing system, including a forward pump source, a wavelength division multiplexer, an active phase-shifted grating array, a backward pump source, and a data demodulation and processing device. The active phase-shifted grating array includes several active phase-shifted gratings engraved on a same fiber, each active phase-shifted grating having a same excitation light wavelength. The active phase-shifted grating array is configured to receive a forward pump pulse and a backward pump light pulse incident from the backward pump source, so that a forward excitation light and a backward excitation light are generated in each active phase-shifted grating, and two adjacent active phase-shifted gratings are enabled to generate excitation light self interference within a same pulse duration. The data demodulation and processing device is configured to perform interference detection on a fiber phase between two adjacent active phase-shifted gratings to detect an acoustic signal acted on the fiber. According to the system in the present application, the passive reflected light interference is replaced with active excitation light interference, thus the excitation light signal has great strength and high stability, and environmental adaptability is high.

3. 发明申请

US20210010834A1 EHZ ULTRAFAST MODULATED PULSE SCANNING LASER AND DISTRIBUTED FIBER SENSING SYSTEM 有权
公开(公告)号：US20210010834A1
公开(公告)日：2021-01-14
申请号：US16534567
申请日：2019-08-07
申请人： Laser Institute of Shandong Academy of Science
发明人： Ying SHANG , Chen WANG , Chang WANG , Jiasheng NI , Wenan ZHAO , Chang LI , Bing CAO , Sheng HUANG , Yingying WANG , Yanbin WU
IPC分类号： G01D5/353 , H01S3/00 , H01S3/067
摘要： An EHz ultrafast modulated pulse scanning laser and a distributed fiber sensing system. A plurality of phase-shift gratings are engraved on a doped fiber, the phase-shift gratings having different central window wavelengths and a wavelength interval between the adjacent central window wavelengths being a preset fixed value. When a pump light emitted by a pump laser source is coupled by a wavelength division multiplexer and enters the doped fiber, a single-mode narrow-linewidth laser light having multiple wavelengths with a wavelength interval being a preset fixed value can be generated, by using the phase-shift gratings graved on the doped fiber. The ultrafast modulation is completed by using a time-domain control method based on an EOM. An internally frequency converted pulse light formed by splicing pulse lights whose frequencies linearly increase is obtained, thus forming the EHz ultrafast modulation of a distributed feedback fiber laser. In this way, a coherence length of an output laser light is increased while a frequency of the laser light is remained.

4. 发明申请

US20180100773A1 TEMPERATURE SENSOR AND TEMPERATURE SENSING SYSTEM BASED ON ACTIVE PHASE-SHIFTED FIBRE GRATING 审中-公开
公开(公告)号：US20180100773A1
公开(公告)日：2018-04-12
申请号：US15605029
申请日：2017-05-25
申请人： Laser Institute of Shandong Academy of Science
发明人： Jian GUO , Chang WANG , Jiasheng NI , Gangding PENG , Zhiqiang SONG , Haifeng QI , Weitao WANG
IPC分类号： G01K11/32 , G01J1/44
摘要： Provided are a temperature sensor and an active phase-shifted grating-based temperature sensing system, relating to a fibre sensing technical field. The temperature sensor comprises a pump laser, a wavelength division multiplexer, an optical detector and an active phase-shifted fibre grating with π phase shift. Pump light emitted by the pump laser enters the active phase-shifted fibre grating through the wavelength division multiplexer. The active phase-shifted fibre grating absorbs the pump light and emits laser light, which travels back through the wavelength division multiplexer and enters the optical detector. The optical detector measures output power of the active phase-shifted fibre grating, to analyze the power to obtain ambient temperature of the active phase-shifted fibre grating. Compared with wavelength demodulation based fibre grating sensors, this temperature sensor can obtain ambient temperature of the active phase-shifted fibre grating solely by analyzing output power of the active phase-shifted fibre grating measured by the optical detector.

5. 发明授权

US10753775B1 Optical fiber flow sensor 有权
公开(公告)号：US10753775B1
公开(公告)日：2020-08-25
申请号：US16515310
申请日：2019-07-18
申请人： Laser Institute of Shandong Academy of Science , Qilu University of Technology
发明人： Yingying Wang , Gangding Peng , Chang Wang , Jiasheng Ni , Qingchao Zhao , Faxiang Zhang , Shaodong Jiang , Long Ma
IPC分类号： G01F1/66 , G01F1/28
摘要： An optical fiber flow sensor, including: a housing, an elastic component, an optical fiber detection component, a floating element, and a fixed sealing joint. The elastic component includes a first and second elastic members that are symmetrical and are disposed in a closely fitted manner, with fitting surfaces of the first and the second elastic members being respectively provided with a corresponding seating groove. The optical fiber detection component is disposed in the seating grooves, and both ends of the optical fiber detection component are welded in the seating grooves via a glass solder. The elastic component is enclosed in the housing, and one end of the housing is fixed at the fixed sealing joint. The optical fiber detection component is sealed within the elastic component so as to avoid direct contact with an external fluid, and prevent damage by corrosion, hydrogen loss, or the like. The optical fiber detection component is welded to the elastic component via a glass solder, thereby avoiding a high-temperature creep deformation of the glue and thermal mismatch.

6. 发明申请

US20180143067A1 FIBER OPTIC ACOUSTIC WAVE DETECTION SYSTEM 审中-公开
公开(公告)号：US20180143067A1
公开(公告)日：2018-05-24
申请号：US15428630
申请日：2017-02-09
申请人： Laser Institute of Shandong Academy of Science
发明人： Chen WANG , Ying SHANG , Xiaohui LIU , Wen'an ZHAO , Long MA , Chang LI , Bing CAO , Jiasheng NI , Chang WANG
IPC分类号： G01H9/00
CPC分类号： G01H9/004
摘要： Provided is a fiber optic acoustic wave detection system, pertaining to the fiber optic sensing technical field. The system comprises a power output apparatus, a backward Rayleigh scattering principle-based first distributed sensing apparatus, a backward weak optical fiber grating reflection principle-based second distributed sensing apparatus, and a third distributed sensing apparatus. The first distributed sensing apparatus and the second distributed sensing apparatus are connected with the power output apparatus, respectively. The first distributed sensing apparatus and the second distributed sensing apparatus are connected with the third distributed sensing apparatus, respectively. Compared with conventional approaches, the signal contrast and sensitivity of the detection system are greatly improved by combining the backward Rayleigh scattered signal in the first distributed sensing apparatus with the backward weak optical fiber grating reflected signal in the second distributed sensing apparatus, and the detection system detection bandwidth is significantly widened by the third distributed sensing apparatus.

7. 发明授权

US11480450B2 EHz ultrafast modulated pulse scanning laser and distributed fiber sensing system 有权
公开(公告)号：US11480450B2
公开(公告)日：2022-10-25
申请号：US16534567
申请日：2019-08-07
申请人： Laser Institute of Shandong Academy of Science
发明人： Ying Shang , Chen Wang , Chang Wang , Jiasheng Ni , Wenan Zhao , Chang Li , Bing Cao , Sheng Huang , Yingying Wang , Yanbin Wu
IPC分类号： H01S3/00 , G01D5/353 , H01S3/067 , H01S3/16
摘要： An EHz ultrafast modulated pulse scanning laser and a distributed fiber sensing system. A plurality of phase-shift gratings are engraved on a doped fiber, the phase-shift gratings having different central window wavelengths and a wavelength interval between the adjacent central window wavelengths being a preset fixed value. When a pump light emitted by a pump laser source is coupled by a wavelength division multiplexer and enters the doped fiber, a single-mode narrow-linewidth laser light having multiple wavelengths with a wavelength interval being a preset fixed value can be generated, by using the phase-shift gratings graved on the doped fiber. The ultrafast modulation is completed by using a time-domain control method based on an EOM. An internally frequency converted pulse light formed by splicing pulse lights whose frequencies linearly increase is obtained, thus forming the EHz ultrafast modulation of a distributed feedback fiber laser. In this way, a coherence length of an output laser light is increased while a frequency of the laser light is remained.

8. 发明授权

US11231299B2 High-performance distributed fiber sensing system based on EHz ultrafast pulse scanning 有权
公开(公告)号：US11231299B2
公开(公告)日：2022-01-25
申请号：US16527491
申请日：2019-07-31
申请人： Laser Institute of Shandong Academy of Science
发明人： Ying Shang , Chen Wang , Chang Wang , Jiasheng Ni , Wenan Zhao , Chang Li , Bing Cao , Sheng Huang , Yingying Wang , Yanbin Wu
IPC分类号： G01D5/353
摘要： A high-performance distributed fiber sensing system based on EHz ultrafast pulse scanning. During testing of a disturbance signal, an internally frequency converted pulse light emitted by an EHz ultrafast pulse scanning laser enters a sensing fiber after passing through a circulator, and a backward Rayleigh scattering signal transmitted by the sensing fiber enters an unbalanced Michelson interferometer after passing through a coupler. By designing an arm length difference between two interference arms, interferences sequentially occur for the backward Rayleigh scattering light at a position where lengths of two adjacent arms differ. A signal received after passing through the unbalanced Michelson interferometer includes a phase difference signal caused by an external disturbance signal in the sensing fiber. Finally, variations of the phase difference signal over time are demodulated by using a phase demodulation unit, so that a dynamic measurement of the disturbance signal in the sensing fiber may be performed.

9. 发明申请

US20210048337A1 FIBER DISTRIBUTED ACOUSTIC SENSING SYSTEM 有权
公开(公告)号：US20210048337A1
公开(公告)日：2021-02-18
申请号：US16567339
申请日：2019-09-11
申请人： Laser Institute of Shandong Academy of Science
发明人： Chen Wang , Ying Shang , Wenan Zhao , Chang Li , Bing Cao , Sheng Huang , Jiasheng Ni , Chang Wang
IPC分类号： G01H9/00 , G01D5/34 , G01D5/353
摘要： The present application discloses a fiber distributed acoustic sensing system, including a forward pump source, a wavelength division multiplexer, an active phase-shifted grating array, a backward pump source, and a data demodulation and processing device. The active phase-shifted grating array includes several active phase-shifted gratings engraved on a same fiber, each active phase-shifted grating having a same excitation light wavelength. The active phase-shifted grating array is configured to receive a forward pump pulse and a backward pump light pulse incident from the backward pump source, so that a forward excitation light and a backward excitation light are generated in each active phase-shifted grating, and two adjacent active phase-shifted gratings are enabled to generate excitation light self interference within a same pulse duration. The data demodulation and processing device is configured to perform interference detection on a fiber phase between two adjacent active phase-shifted gratings to detect an acoustic signal acted on the fiber. According to the system in the present application, the passive reflected light interference is replaced with active excitation light interference, thus the excitation light signal has great strength and high stability, and environmental adaptability is high.

10. 发明授权

US10466117B2 Temperature sensor and temperature sensing system based on active phase-shifted fibre grating 有权
公开(公告)号：US10466117B2
公开(公告)日：2019-11-05
申请号：US15605029
申请日：2017-05-25
申请人： Laser Institute of Shandong Academy of Science
发明人： Jian Guo , Chang Wang , Jiasheng Ni , Gangding Peng , Zhiqiang Song , Haifeng Qi , Weitao Wang
IPC分类号： G01K11/32
摘要： Provided are a temperature sensor and an active phase-shifted grating-based temperature sensing system, relating to a fiber sensing technical field. The temperature sensor comprises a pump laser, a wavelength division multiplexer, an optical detector and an active phase-shifted fiber grating with π phase shift. Pump light emitted by the pump laser enters the active phase-shifted fiber grating through the wavelength division multiplexer. The active phase-shifted fiber grating absorbs the pump light and emits laser light, which travels back through the wavelength division multiplexer and enters the optical detector. The optical detector measures output power of the active phase-shifted fiber grating, to analyze the power to obtain ambient temperature of the active phase-shifted fiber grating. Compared with wavelength demodulation based fiber grating sensors, this temperature sensor can obtain ambient temperature of the active phase-shifted fiber grating solely by analyzing output power of the active phase-shifted fiber grating measured by the optical detector.

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