Patents Assigned to Laser Institute of Shandong Academy of Sciences
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Publication number: 20230324281Abstract: A two-dimensional multi-point-reflection long-optical-path gas sensor probe includes: a protecting housing and a multi-point total reflection type long-optical-path module arranged in the protecting housing. The multi-point total reflection type long-optical-path module includes two right-angle reflecting prisms or mirror pairs spaced at a set distance, and inclined surfaces of the right-angle reflecting prisms or mirror pairs are oppositely arranged and parallel to each other. A set deviation exists between center lines of the two right-angle reflecting prisms or mirror pairs, and the deviation can enable light beams parallel to the center lines to be reflected for a set number of times between the two right-angle reflecting prism or mirror pairs, so as to form a two-dimensional parallel light beam group. Thereby increasing a measurement optical path of gas absorption, which is beneficial to improve the detection signal-to-noise ratio and the measurement accuracy.Type: ApplicationFiled: January 13, 2021Publication date: October 12, 2023Applicant: LASER INSTITUTE, SHANDONG ACADEMY OF SCIENCESInventors: Tongyu LIU, Yanong NING, Yanfang LI, Dehu LI, Guangxian JIN, Tingting ZHANG, Wei ZHANG
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Publication number: 20230288272Abstract: The present application provides a multi-wavelength laser for synchronously monitoring the temperature and pressure of an ocean. A pulse controller is used to convert a broadband laser outputted by a broadband laser source into a broadband pulsed light, and then a phase shifted fiber bragg grating unit is used to demodulate a plurality of pulsed light with different wavelengths from the broadband pulsed light. The pulsed light outputted by the laser is emitted into a sensing fiber in seawater by means of a wavelength division multiplexer, scattered light is returned to a control demodulation module by means of the wavelength division multiplexer, the control demodulation module demodulates the scattered light, so that the dynamic pressure is parsed according to a phase change of a light signal, and the seawater temperature is parsed according to a wavelength change of the light signal.Type: ApplicationFiled: July 6, 2020Publication date: September 14, 2023Applicant: LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCEInventors: Ying SHANG, Jiasheng NI, Chen WANG, Qian GUO, Zhiqiang SONG, Wenan ZHAO, Sheng HUANG, Chang LI, Bing CAO, Lei LV
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Patent number: 11624756Abstract: Disclosed is an optical fiber flow velocity measuring apparatus and method integrating high and low ranges.Type: GrantFiled: October 18, 2021Date of Patent: April 11, 2023Assignee: Laser Institute of Shandong Academy of ScienceInventors: Zhen Li, Jiqiang Wang, Yuhui Feng, Jiamin Wang, Tongyu Liu, Lin Zhao, Moyu Hou, Yuan Liu, Guofeng Dong
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Patent number: 11506681Abstract: Described are a two-dimensional wind-speed and wind-direction sensor and a system thereof, relating to the field of sensing devices. The two-dimensional wind-speed and wind-direction sensor includes: an X-direction wind speed probe assembly and a Y-direction wind speed probe assembly, the X-direction wind speed probe assembly and the Y-direction wind speed probe assembly are perpendicular to each other, and the X-direction wind speed probe assembly is configured to measure a X-direction wind speed including a wind speed in the reverse direction of an X-axis, Vx?, and a wind speed in the forward direction of the X-axis Vx+; and the Y-direction wind speed probe assembly is configured to measure a Y-direction wind speed including a wind speed in reverse direction of an Y-axis, Vy?, and a wind speed in the forward direction of the Y-axis, Vy+.Type: GrantFiled: August 7, 2018Date of Patent: November 22, 2022Assignee: Laser Institute, Shandong Academy of SciencesInventors: Jiqiang Wang, Yanong Ning, Zhen Li, Tongyu Liu, Lin Zhao, Yuan Liu, Moyu Hou
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Patent number: 11480450Abstract: 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.Type: GrantFiled: August 7, 2019Date of Patent: October 25, 2022Assignee: LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCEInventors: Ying Shang, Chen Wang, Chang Wang, Jiasheng Ni, Wenan Zhao, Chang Li, Bing Cao, Sheng Huang, Yingying Wang, Yanbin Wu
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Publication number: 20220120779Abstract: Disclosed is an optical fiber flow velocity measuring apparatus and method integrating high and low ranges.Type: ApplicationFiled: October 18, 2021Publication date: April 21, 2022Applicant: Laser Institute of Shandong Academy of ScienceInventors: Zhen LI, Jiqiang WANG, Yuhui FENG, Jiamin WANG, Tongyu LIU, Lin ZHAO, Moyu HOU, Yuan LIU, Guofeng DONG
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Patent number: 11248952Abstract: 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.Type: GrantFiled: September 11, 2019Date of Patent: February 15, 2022Assignee: Laser Institute of Shandong Academy of ScienceInventors: Chen Wang, Ying Shang, Wenan Zhao, Chang Li, Bing Cao, Sheng Huang, Jiasheng Ni, Chang Wang
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Patent number: 11231299Abstract: 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.Type: GrantFiled: July 31, 2019Date of Patent: January 25, 2022Assignee: LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCEInventors: Ying Shang, Chen Wang, Chang Wang, Jiasheng Ni, Wenan Zhao, Chang Li, Bing Cao, Sheng Huang, Yingying Wang, Yanbin Wu
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Patent number: 11054302Abstract: The present invention provides an event positioning method, device and application in a distributed fiber vibration monitoring system. When a location at which an event occurs in a sensing fiber is to be positioned, an interference field signal having a maximum optical power is obtained by comparing optical powers of respective interference field signals corresponding to backward Rayleigh scattering lights that are generated when a pulse light is transmitted in the sensing fiber. Subsequently, a sensing location of the interference field signal having the maximum optical power is calculated. Finally, the location at which the event occurs in the sensing fiber is determined, according to the sensing location and a location distribution pattern of the event. According to the positioning method provided in the present invention, by screening the interference field signals and then calculating the event location, the spatial resolution is not determined merely by the pulse width of the optical signal.Type: GrantFiled: June 17, 2019Date of Patent: July 6, 2021Assignee: Laser Institute of Shandong Academy of ScienceInventors: Ying Shang, Chen Wang, Chang Wang, Jiasheng Ni, Chang Li, Wenan Zhao, Bing Cao, Sheng Huang, Xiaohui Liu, Yingying Wang
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Publication number: 20200355547Abstract: The present invention provides an event positioning method, device and application in a distributed fiber vibration monitoring system. When a location at which an event occurs in a sensing fiber is to be positioned, an interference field signal having a maximum optical power is obtained by comparing optical powers of respective interference field signals corresponding to backward Rayleigh scattering lights that are generated when a pulse light is transmitted in the sensing fiber. Subsequently, a sensing location of the interference field signal having the maximum optical power is calculated. Finally, the location at which the event occurs in the sensing fiber is determined, according to the sensing location and a location distribution pattern of the event. According to the positioning method provided in the present invention, by means of screening the interference field signals and then calculating the event location, the spatial resolution is not determined merely by the pulse width of the optical signal.Type: ApplicationFiled: June 17, 2019Publication date: November 12, 2020Applicant: Laser Institute of Shandong Academy of ScienceInventors: Ying SHANG, Chen WANG, Chang WANG, Jiasheng NI, Chang LI, Wenan ZHAO, Bing CAO, Sheng HUANG, Xiaohui LIU, Yingying WANG
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Patent number: 10753775Abstract: 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.Type: GrantFiled: July 18, 2019Date of Patent: August 25, 2020Assignees: Laser Institute of Shandong Academy of Science, Qilu University of TechnologyInventors: Yingying Wang, Gangding Peng, Chang Wang, Jiasheng Ni, Qingchao Zhao, Faxiang Zhang, Shaodong Jiang, Long Ma
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Patent number: 10697853Abstract: An optical fiber distributed monitoring system and method is provided. The system includes a laser device, an acousto-optic modulator, a phase matching interferometer, a photoelectric detector and a phase demodulation module. After entering the phase matching interferometer, the Rayleigh backscattering light containing parameter information output from the sensing optical fiber enters the two arms of the phase matching interferometer respectively, and the light of the two arms of the phase matching interferometer is phase-modulated by the first modulation wave and the second modulation wave, respectively and then interfere with each other to generate interference light. The photoelectric detector converts a light signal into an electric signal, and the phase demodulation module processes the electric signal based on the Hilbert algorithm to obtain the parameter change of the environment under test.Type: GrantFiled: November 13, 2018Date of Patent: June 30, 2020Assignee: Laser Institute of Shandong Academy of SciencesInventors: Ying Shang, Chen Wang, Chang Wang, Jiasheng Ni, Chang Li, Bing Cao, Wen'an Zhao, Sheng Huang, Yang Liu, Xiaohui Liu, Yingying Wang
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Patent number: 10466117Abstract: 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 ? 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.Type: GrantFiled: May 25, 2017Date of Patent: November 5, 2019Assignee: LASER INSTITUTE OF SHANDONG ACADEMY OF SCIENCEInventors: Jian Guo, Chang Wang, Jiasheng Ni, Gangding Peng, Zhiqiang Song, Haifeng Qi, Weitao Wang
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Patent number: 10145726Abstract: 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.Type: GrantFiled: February 9, 2017Date of Patent: December 4, 2018Assignee: Laser Institute of Shandong Academy of ScienceInventors: Chen Wang, Ying Shang, Xiaohui Liu, Wen'an Zhao, Long Ma, Chang Li, Bing Cao, Jiasheng Ni, Chang Wang