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Article Type: Patent abstracts From: Sensor Review, Volume 32, Issue 4
Title: Mining fiber Bragg grating vacuum sensorPublication number: CN201852668 (U)Publication date: 1 June 2011Applicant(s): Univ Shandong
Abstract: The utility model relates to a mining fiber Bragg grating vacuum sensor which comprises a case. An opening is formed on one side of the case; a strain film is arranged in the opening in a sealing way; an elastic rod perpendicular to the strain film is arranged in the case; one end of the elastic rod contacts with the strain film, and the other end of the elastic rod penetrates through the side surface of the case and is exposed to the outside; a fiber Bragg grating is arranged on the elastic rod in the case and is connected with a demodulating device outside the case through optical fiber; and a negative pressure zone is formed between the opening of the case and the strain film, and the other zone in the case is communicated with the outside and is a normal pressure zone. The mining fiber Bragg grating vacuum sensor has the advantage of being simpler in structure. The sensor can be used for remote measurement, and optical signals can be transmitted at long range in the optical fiber with extreme low loss. The sensor resists electromagnet interference, and electric signals are not interfered by the severe electromagnetic environment at a measurement field. A sensor network is easy to form, a plurality of probes can be adopted to form the sensor network, and an identical set of demodulating system can be used in a unified way.
Title: Disaster prevention fiber optic sensor and device for landslide monitoringPublication number: JP2011220986 (A)Publication date: 4 November 2011Applicant(s): Advanced Technology KK; Sasaki Kazumasa
Problem to be solved: to provide a landslide monitoring device which is prevented from being influenced by a temperature change of environment.
Solution: a tension information is obtained without using a spectrum analyzer by: arranging two fiber Bragg grating (FBG) 5 and 7 having a different reflection wavelength each other at two points those located on a same fiber optic 3 loaded with equal tension but in a different temperature environment; obtaining a tension information by utilizing a fact that information on tension changing is of an in-phase type in response signals of two FBG 5 and 7; and utilizing additional pair of FBG 6 and 8 for a use of reference. The pair of the reference FBG has the same pair of the reflection wavelength as that of the pair of a sensing FBG. By passing a reflectance of the sensing FBG through the corresponding reference FBG, respectively, changing in wavelength is converted to changing in light power. The converted data goes through analog signal process, or is converted to digital signal by AD conversion and processed in digital signal processing with defined algorithm.
Title: Building earthquake forecasting device based on wireless sensor networkPublication number: CN201853322 (U)Publication date: 1 June 2011Applicant(s): Univ Fujian
Abstract: The utility model relates to a building earthquake forecasting device based on a wireless sensor network, which comprises a data storage server, a plurality of wireless sensor network nodes, a single chip microcomputer and an audible alarm, wherein the single chip microcomputer is in communication with the wireless sensor network nodes. The building earthquake forecasting device is characterized in that parts of the wireless sensor network nodes are connected with a temperature sensor and a shock sensor and buried under a building foundation, the other parts of the wireless sensor network nodes are connected with the shock sensor and arranged among floors, and the single chip microcomputer is connected with the data storage server and the audible alarm. The building earthquake forecasting device is capable of realizing forecasting of an earthquake for people living on low floors, gaining time for residents to escape from a building, and also assisting relevant departments in monitoring earthquakes.
Title: Automatic leveling system and method for six-point support bridging platformPublication number: CN102174794 (A)Publication date: 7 September 2011Applicant(s): Univ Jiangsu Science & Tech
Abstract: The invention discloses an automatic leveling system and method for a six-point support bridging platform; six supporting legs are, respectively, provided with a pressure sensor and, respectively, connected with a hydraulic device; each hydraulic device is connected with the pressure sensor and an electro-hydraulic servo valve; and a controller is, respectively, connected with an alarm, a double-shaft tilt sensor, each pressure sensor and each electro-hydraulic servo valve. Coarse adjustment is performed firstly, and then fine adjustment is performed; the coarse adjustment comprises the steps of: inputting a sensed pressure signal of each supporting leg to the controller by the corresponding pressure sensor on the supporting leg, if the pressure value of the supporting leg is less than a preset value in the controller, controlling the alarm to emit an alarm by the controller, or else, performing the fine adjustment; and the fine adjustment comprises the steps of: keeping two middle auxiliary supporting legs still, adjusting two forward supporting legs and two backward supporting legs, keeping the highest supporting leg still, firstly leveling an X direction, and then leveling a Y direction. The automatic leveling system and method for the six-point support bridging platform can ensure that the platform can be automatically leveled in an outdoor severe environment, the good leveling precision and speed can be obtained, and strong environmental applicability and safety are provided.