Abstract: Disclosed is a measurement system using a fiber Bragg grating sensor, which includes a sensing unit including a plurality of dynamic sensors and static sensors using fiber Bragg gratings to detect mutually different physical quantities to be measured, an optical meter configured to measure each physical quantity by simultaneously processing data output from the plurality of dynamic sensors and static sensors in real time, and a server configured to store and manage the data measured by the optical meter. Mutually different physical quantities are measured by simultaneously processing the data output from the plurality of dynamic sensors and static sensors in real time by using one optical meter.

Abstract: Discloses is a precipitation measuring apparatus using a fiber Bragg grating sensor, which includes: a base horizontally installed at a position for measuring precipitation; a cylindrical cover fixedly installed on the base; a bucket for collecting a predetermined amount of water introduced into the cover to discharge the collected water; and a detecting unit for detecting the number of times of discharging the water from the bucket by using the fiber Bragg grating sensor, wherein the change in the load applied onto the water collecting tank at a predetermined amount of water discharged from the bucket is detected using the fiber Bragg grating sensor, and the amount of precipitation is precisely measured using the number of changes in the wavelength of the light outputted from the fiber Bragg grating sensor.

Abstract: A temperature measuring device using an optical fiber Bragg grating sensor is proposed, which includes: an optical fiber wound one or more times on a ring part, which has a preset diameter by rotating a part of the optical fiber once, thereby maintaining a predetermined shape; a housing in which the optical fiber is arranged; and an optical fiber Bragg grating sensor provided in a straight line part of the optical fiber, and thus the present invention prevents deformation of the optical fiber and the optical fiber Bragg grating sensor, which are arranged to be spaced apart at a predetermined distance in the housing, even when deformation occurs in the housing according to a change in the outside temperature, thereby accurately measuring temperature without distortion.

Abstract: The present invention relates to an apparatus and a method for measuring ground subsidence using a pressure gauge, in which the apparatus includes: a plurality of pressure gauges installed along a ground surface at a subsidence reference point of ground and a plurality of measurement positions to be measured, respectively, to measure a pressure displacement at each of the measurement positions; a pressure transmission pipe filled therein with a liquid supplied from a tank installed at the subsidence reference point to transmit a pressure to each of the pressure gauges; and a measurement terminal connected to each of the pressure gauges through an optical cable, and configured to convert the pressure displacement measured by each of the pressure gauges into a height displacement to measure an amount of the ground subsidence.

Abstract: The present invention relates to an apparatus and a method for measuring ground subsidence using a pressure gauge, in which the apparatus includes: a plurality of pressure gauges installed along a ground surface at a subsidence reference point of ground and a plurality of measurement positions to be measured, respectively, to measure a pressure displacement at each of the measurement positions; a pressure transmission pipe filled therein with a liquid supplied from a tank installed at the subsidence reference point to transmit a pressure to each of the pressure gauges; and a measurement terminal connected to each of the pressure gauges through an optical cable, and configured to convert the pressure displacement measured by each of the pressure gauges into a height displacement to measure an amount of the ground subsidence.

Abstract: Disclosed are a method of fixing an optical fiber and a measuring apparatus using the same, in which the method includes (a) heating a fixing portion where the optical fiber is to be fixed to an object, and (b) forming a concavo-convex structure by melting the heated fixing portion. The optical fiber is fixed to the object by filling an adhesive or filler in a state in which the fixing portion having the concavo-convex structure is disposed in an insertion space formed in the object. The optical fiber and the object can be firmly fixed using the mechanical coupling structure by forming the concavo-convex portion in a part where the optical fiber is to be fixed, and slip can be prevented from occurring between the cladding and the covering jacket.

Abstract: Disclosed is a measurement system using a fiber Bragg grating sensor, which includes a sensing unit including a plurality of dynamic sensors and static sensors using fiber Bragg gratings to detect mutually different physical quantities to be measured, an optical meter configured to measure each physical quantity by simultaneously processing data output from the plurality of dynamic sensors and static sensors in real time, and a server configured to store and manage the data measured by the optical meter. Mutually different physical quantities are measured by simultaneously processing the data output from the plurality of dynamic sensors and static sensors in real time by using one optical meter.

Abstract: Discloses is a precipitation measuring apparatus using a fiber Bragg grating sensor, which includes: a base horizontally installed at a position for measuring precipitation; a cylindrical cover fixedly installed on the base; a bucket for collecting a predetermined amount of water introduced into the cover to discharge the collected water; and a detecting unit for detecting the number of times of discharging the water from the bucket by using the fiber Bragg grating sensor, wherein the change in the load applied onto the water collecting tank at a predetermined amount of water discharged from the bucket is detected using the fiber Bragg grating sensor, and the amount of precipitation is precisely measured using the number of changes in the wavelength of the light outputted from the fiber Bragg grating sensor.

Abstract: Disclosed are an apparatus for measuring a displacement using a fiber Bragg grating sensor, which is applied to a strain sensor using the fiber Bragg grating sensor, and a method of controlling sensitivity and durability of the same. The apparatus includes: a case forming an external appearance; third and fourth optical fibers having mutually different numbers of strands and installed in the case while being spaced apart from each other by a predetermined interval; and a connection unit installed between the third and fourth optical fibers and fixed at a predetermined position by tension applied to the third and fourth optical fibers, wherein the fiber Bragg grating sensor is installed to one selected from the pair of optical fibers having mutually different numbers of strands, so that measurement sensitivity and durability are controllable.

Abstract: A temperature measuring device using an optical fiber Bragg grating sensor is proposed, which includes: an optical fiber wound one or more times on a ring part, which has a preset diameter by rotating a part of the optical fiber once, thereby maintaining a predetermined shape; a housing in which the optical fiber is arranged; and an optical fiber Bragg grating sensor provided in a straight line part of the optical fiber, and thus the present invention prevents deformation of the optical fiber and the optical fiber Bragg grating sensor, which are arranged to be spaced apart at a predetermined distance in the housing, even when deformation occurs in the housing according to a change in the outside temperature, thereby accurately measuring temperature without distortion.

Abstract: Disclosed are an apparatus for measuring a displacement using a fiber Bragg grating sensor, which is applied to a strain sensor using the fiber Bragg grating sensor, and a method of controlling sensitivity and durability of the same. The apparatus includes: a case forming an external appearance; third and fourth optical fibers having mutually different numbers of strands and installed in the case while being spaced apart from each other by a predetermined interval; and a connection unit installed between the third and fourth optical fibers and fixed at a predetermined position by tension applied to the third and fourth optical fibers, wherein the fiber Bragg grating sensor is installed to one selected from the pair of optical fibers having mutually different numbers of strands, so that measurement sensitivity and durability are controllable.

Abstract: Disclosed are an apparatus for measuring a displacement using a fiber Bragg grating sensor, which is applied to a strain sensor using the fiber Bragg grating sensor, and a method of controlling sensitivity and durability of the same. The apparatus includes: a case forming an external appearance; third and fourth optical fibers having mutually different numbers of strands and installed in the case while being spaced apart from each other by a predetermined interval; and a connection unit installed between the third and fourth optical fibers and fixed at a predetermined position by tension applied to the third and fourth optical fibers, wherein the fiber Bragg grating sensor is installed to one selected from the pair of optical fibers having mutually different numbers of strands, so that measurement sensitivity and durability are controllable.

Abstract: Disclosed are an apparatus for measuring a displacement using a fiber Bragg grating sensor, which is applied to a strain sensor using the fiber Bragg grating sensor, and a method of controlling sensitivity and durability of the same. The apparatus includes: a case forming an external appearance; third and fourth optical fibers having mutually different numbers of strands and installed in the case while being spaced apart from each other by a predetermined interval; and a connection unit installed between the third and fourth optical fibers and fixed at a predetermined position by tension applied to the third and fourth optical fibers, wherein the fiber Bragg grating sensor is installed to one selected from the pair of optical fibers having mutually different numbers of strands, so that measurement sensitivity and durability are controllable.

Abstract: Provided is an apparatus for measuring convergence and ceiling subsidence using a fiber bragg grating sensor. The apparatus includes a plurality of unit-fiber bragg grating sensor modules having a predetermined length and sequentially connected to each other, where each of the sensor modules comprises: a fiber bragg grating stain sensor installed in a protective tube to sense a variation of a length; an installing member installed in parallel to one side of the protective tube; a fiber bragg grating angle displacement sensor mounted on the installing member to measure angle displacement; bases provided at both ends of each sensor module to connect adjacent sensor modules to each other; and a fixing member and a fixing unit to fix both ends of the protective tube and the installing member to the bases, respectively. Each of the sensor modules continuously measures two-dimensional or three-dimensional convergence and ceiling subsidence.

Abstract: Provided is an apparatus for measuring convergence and ceiling subsidence using a fiber bragg grating sensor. The apparatus includes a plurality of unit-fiber bragg grating sensor modules having a predetermined length and sequentially connected to each other, where each of the sensor modules comprises: a fiber bragg grating stain sensor installed in a protective tube to sense a variation of a length; an installing member installed in parallel to one side of the protective tube; a fiber bragg grating angle displacement sensor mounted on the installing member to measure angle displacement; bases provided at both ends of each sensor module to connect adjacent sensor modules to each other; and a fixing member and a fixing unit to fix both ends of the protective tube and the installing member to the bases, respectively. Each of the sensor modules continuously measures two-dimensional or three-dimensional convergence and ceiling subsidence.

Abstract: Disclosed is an inclinometer system capable of detecting the inclination of the ground using a fiber bragg grating sensor to precisely measure the deformation of the ground. The inclinometer system includes at least one measuring unit, and the measuring unit includes a body provided therein with a receiving part, a frame inserted into the body, a weight member inserted in to the frame and having one end hinged to the frame, the weight member rotating in cooperation to inclination of the body, an optical fiber 5 passing through both the body and the frame such that one end of the optical fiber is fixed to the weight member, a fixing member installed into the frame to fix an opposite end of the optical fiber, and a fiber bragg grating (FBG) sensor attached to the optical fiber.

Abstract: There is provided a fixer for a fiber bragg grating (FBG) sensor, by which the FBG can be installed by any person to provide the FBG sensor with an accurate value, irrespective of a place to be installed, and the FBG sensor can be semi-permanently fixed and protected. The fixer includes a pair of fixing pieces 3 with a bottom surface adhered to the object, in which both ends of the FBG sensor S is inserted and adhered by an adhesive F, a tube 2 for spacing the pair of fixing pieces at regular intervals, in which the FBG sensor S is inserted into a hollow portion of the tube to protect the FBG sensor S from the exterior, and a member for fixing the fixing pieces 3 and the pipe 2, without producing an error of above 0.0002 mm.

Abstract: There is provided a fixer for a fiber bragg grating (FBG) sensor, by which the FBG can be installed by any person to provide the FBG sensor with an accurate value, irrespective of a place to be installed, and the FBG sensor can be semi-permanently fixed and protected. The fixer includes a pair of fixing pieces 3 with a bottom surface adhered to the object, in which both ends of the FBG sensor S is inserted and adhered by an adhesive F, a tube 2 for spacing the pair of fixing pieces at regular intervals, in which the FBG sensor S is inserted into a hollow portion of the tube to protect the FBG sensor S from the exterior, and a member for fixing the fixing pieces 3 and the pipe 2, without producing an error of above 0.0002 mm.