36results about How to "Avoid chirping" patented technology

The invention discloses a temperature-insensitive optical fiber grating acceleration sensor, which comprises an outer casing used as a support structure of the acceleration sensor, an optical fiber grating used to measure acceleration, a shaft fixed on the front sidewall and the back sidewall of the acceleration sensor, an L-type lever arranged on the shaft and a mass block fixed on the horizontal end part of the lever, wherein one end of the optical fiber grating is fixed on the inner wall of one end of the acceleration sensor, while the other end parallelly passes through the small hole on the other end of the acceleration sensor and extends outside the acceleration sensor; the L-type lever is used to send vibration signal to the optical fiber grating connected with the lever, and the folding point of the cross part of the vertical part and the horizontal part of the L-type lever is in movable connection with the shaft; and the mass block is used to adjust the sensitivity and the natural vibration frequency of the sensor. The optical fiber grating acceleration sensor increases sensitivity and improves packaging technology.

The invention discloses a high-sensitivity fiber Bragg grating displacement sensor, which comprises a metal packaging shell and is characterized by further comprising a fiber Bragg grating, a measuring rod, a bearing, a track, a guide shaft, an elastic alloy component, a horizontal sliding block, a connecting device and a slidable support, wherein one end of the metal packaging shell is provided with the bearing and the guide shaft, and the other end is provided with the horizontal track; the guide shaft is connected with the elastic alloy component and contacted with the horizontal sliding block; the elastic alloy component is internally provided with the tensioned grating; and the horizontal sliding block is fixed with the measuring rod through the connecting device and connected with the track. The fiber Bragg grating displacement sensor has the beneficial effects that variations in displacement can be monitored accurately, the sensitivity is high, and the size is small compared with common fiber Bragg grating displacement sensors.

The invention discloses an optical fiber grating sensor device and a monitoring system for detecting the force state of a water-lubricated bearing, which solves the problems of low implantation success rate, short service life and high cost of the optical fiber grating sensor. The fiber Bragg grating sensing device of the present invention includes a rubber bush composed of a plurality of rubber bush strips, at least one rubber bush strip is embedded with an optical fiber grating sensing unit along the inner edge, and the fiber grating sensing unit includes an axially embedded The capillary in the rubber bush strip, the optical fiber packaged in the capillary, and the filler filled between the capillary and the optical fiber; multiple gratings are arranged on the optical fiber. The monitoring system of the invention comprises a fiber grating sensing device, a fiber grating demodulator, a host computer, a data comprehensive analysis unit and an alarm and output unit. The invention is easy to manufacture, low in cost, good in reliability, long in service life, high in accuracy, and can monitor the load, temperature and stress of the bearing bush synchronously and continuously.

The invention relates to an optical fiber grating sensor packaging device, which comprises a base, a worktable, a heating device, a glue coating device, two optical fiber clamping mechanisms and a prestressing adjusting device. The prestressing adjusting device is arranged on the base; one of the two optical fiber clamping mechanisms is arranged on the output end of the prestressing adjusting device and the other one is arranged on the base; the optical fiber clamping mechanism arranged on the output end of the prestressing adjusting device adjusts the distance from the optical fiber clampingmechanism to the other fiber clamping mechanism by the action of the prestressing adjusting device; the worktable is arranged on the base which is located between the two optical fiber clamping mechanisms; and the heating device is arranged between the base and the worktable. According to the optical fiber grating sensor packaging device and the method, which has the advantages of easy operation,stable and reliable work, and fine adjustment, constant prestressing can be applied to the optical fiber grating sensor, and the same pre-stress can be applied to avoid optical fiber grating defects and waveform distortion, therefore stable and good consistency of wavelength temperature characteristics is guaranteed.

The invention discloses a fiber grating earth pressure sensor which comprises a sensor shell, a pressure transmission component and a fiber grating. The earth pressure sensor is characterized in that the pressure transmission component is of a rhombus structure, and the is positioned between a bearing-type top cover and a bottom plate, and is in contact with the bearing-type top cover and the bottom plate; clearances are arranged among the pressure transmission component and the left side and the right side of the sensor shell; a grating is pasted on a metal elastic membrane; the metal elastic membrane is arranged on a transverse diagonal line between a left angle and a right angle of the pressure transmission component; and two sides of the metal elastic membrane are fixed on the left angle and the right angle of the pressure transmission component. The earth pressure sensor provided by the invention has the characteristics of large measuring span, high accuracy and simple structure,is good for miniaturization of the integral structure.

The invention provides a high-sensitivity temperature compensation type fiber Bragg grating acceleration sensor, which comprises a cubic shell (1), a double-arched elastic structure beam (2) fixed ona shell panel, and double fiber Bragg gratings, i.e., a 1# fiber Bragg grating (5) and a 2# fiber Bragg grating (6) fixed on the double-arched elastic structure beam, wherein the middle of the double-arched elastic structure beam (2) is provided with a vertical beam (22); one side of the shell (1) is fixedly provided with rigid sliding rods (8) and a damper (10); a mass block (9) is positioned onthe rigid sliding rods (8) and is connected with the damper (10); and one end of a prestressed spring (7) is fixed on the vertical beam (22), and the other end of the prestressed spring (7) is fixed on one side of the mass block (9). By use of the sensor, the double-arched elastic structure beam is used for fixing double fiber Bragg gratings below the arched beam, so that the sensitivity of the fiber Bragg grating acceleration sensor is greatly improved, tail fibers on two ends of the sensor are both free ends so as to be connected with other fiber Bragg grating sensors in series, and a sensing array or network can be formed to realize distributed sensing.

The invention discloses a king-shaped optical fiber grating sensor patch. The patch has a symmetrical king-shaped structure as a whole. There are two connecting parts, the strain temperature horizontal side is connected to the single temperature horizontal side through the connecting part, and the single temperature horizontal side is connected to the pasting side through another connecting part. The fiber grating in the second hole of the patch can directly measure the temperature of the structure, and the result of the fiber grating in the first hole can be subtracted from the result of the fiber grating in the second hole to get the strain of the structure, which can prevent the fiber The grating produces a chirp phenomenon, and the size of each part of the patch can be designed according to the measurement requirements of different occasions combined with the average strain transfer rate formula, so that the size of the patch is small and suitable for pasting.