43results about How to "Increase measurement length" patented technology

The invention discloses a surrounding rock mining damage range segmented testing system belonging to the mine top bottom plate rock damage range measuring technology field. The problems of the mine top bottom plate rock observation device such as one-time plugging multi-segment measurement, plugging leakage measurement integration, and water pressure conversion measurement can be solved. The above mentioned testing system comprises a plugging system, a guide system, a supply propulsion system, and a pressure conversion system. The plugging system comprises a first plugging unit, a second plugging unit, and a third plugging unit. Each of the plugging units comprises a water leakage pipe and pipe-shaped joints connected with the two ends of the water leakage pipe. A communicating pipe is connected between the adjacent plugging units, and the two ends of the communicating pipe are respectively connected with the pipe-shaped joints of the adjacent plugging units. A plugging capsule is disposed on the outer periphery of the water leakage pipe between the two pipe-shaped joints, and a certain plugging space can be formed between the plugging capsule and the water leakage pipe. The one-time plugging multi-segment measurement, the plugging leakage measurement integration, and the plugging of the water pressure conversion from the high pressure water source to the low pressure water source can be realized by using the testing system.

The invention provides an automobile crossbeam assembly hole visual on-line measurement system and a method thereof. The system comprises a main control platform, a servo motor, a servo motor encoder, a slide platform, a slide block, a horizontal slide rail, a fixed high and low frame, a camera and a measured crossbeam. A host is arranged on the main control platform. A motion control card and an image acquisition card are respectively inserted in PCI insertion slots of the host. The host is connected with the servo motor through the motion control card. The servo motor encoder is coaxially connected with the servo motor. The servo motor is fixed on the slide platform. The slide platform is matched and connected with the horizontal slide rail through the slide block. The horizontal slide rail is arranged on the high side of the fixed high and low frame. The host is connected with the camera through the image acquisition card. The camera is arranged on the slide platform through a Z type height adjustable bracket. The measured crossbeam is arranged on the low side of the fixed high and low frame. According to the invention, non-contact and full-automatic high speed on-line measurement is carried out on the hole diameter and the hole site size of an automobile crossbeam assembly hole; and the system and the method are especially suitable for the measurement of the crossbeam with nonuniform assembly hole distribution and without assembly holes in certain areas.

The invention discloses a segmented testing method for a surrounding rock mining destruction range, and belongs to the technical field of mine top and bottom plate rock mass destruction range determination. The determination problems of one-time plugging multi-segment measuring, plugging and leakage measuring integration, internal water pressure conversion of mine top and bottom plate rock mass observation equipment are solved. An adopted testing system comprises a plugging system, a guiding system, a feeding propelling system and a pressure converting system; each plugging unit of the plugging system comprises a water leakage tube and tubular joints connected to the two ends of the water leakage tube, a communicating tube is arranged between every two plugging units, the two ends of each communicating tube are connected to the tubular joints of the adjacent plugging units respectively, the periphery, between two tubular joints, of each water leakage tube is provided with a plugging capsule, and a certain plugging space is formed between each plugging capsule and the corresponding water leakage tube. According to the testing method, one-time plugging multi-segment measuring, plugging and leakage measuring integration and pressure conversion from a plugging high-pressure water source to an observing low-pressure water source can be simultaneously achieved.

The invention discloses a chaotic laser related Brillouin optical time domain analyzer integrated with an optical fiber Raman amplifier. The analyzer is manufactured by using a chaotic laser related principle, an optical fiber stimulated Raman scattered light amplification effect, the strain of coherently amplified Brillouin scattered light, a temperature effect and an optical time domain reflection principle. Through related processing of back detection light and local reference light of a sensing optical fiber, the spatial resolution of a sensor system is improved; a continuously-running high-power optical fiber Raman laser is used as a pump light source of the Brillouin optical time domain analyzer to overcome the difficulty that the frequencies of a detection laser and a pump laser are required to be strictly locked by an optical fiber Brillouin optical time domain analyzer; and a broadband optical fiber Raman amplifier replaces a narrow-band optical fiber Brillouin amplifier, so the gain of back coherently amplified stimulated Brillouin scattered light is increased, the signal-to-noise ratio of the sensor system is improved, and correspondingly, the measuring length and the measuring accuracy of a sensor are improved.

The invention discloses an ultra-long range 100km decentralized optical fiber Rayleigh and Raman scattering sensor. The sensor comprises an optical fiber pulse laser, an integrated optical fiber wavelength division multiplexer, an optical fiber narrow band reflection filter, an optical fiber shunt, an optical fiber Raman sensor, a 100km sensing optical fiber, a photoelectric receiving module, a digital signal processor and an industrial personal computer. The sensor adopts a decentralized optical fiber Raman amplifier, which amplifies a backward Rayleigh scattering signal generated by detection laser in a sensing optical fiber and having strain information, amplifies a backward anti-Stokes scattering signal with temperature information, improves the signal to noise ratio of a sensor system, increases the measuring length of the sensor, improves the reliability and the space resolution of the sensor and can measure the deformation, the cracks and the temperature of a field while measuring the field temperature, and the deformation, the cracks and the temperature are not uncrossed. The sensor has the characteristics of low cost, long service life, simple structure, good signal to noise ratio and the like, and is applicable to petrochemical pipe monitoring, tunnel monitoring, large civil engineering monitoring and hazard forecast monitoring in a range of ultra-long range 100km.

The invention discloses a narrow-bandwidth Brillouin optical timedomain reflectometer (OTDR) based on a sensing optical fiber of a three-layer structure. The OTDR comprises a light pulse generating unit (200), wherein light pulses generated by the light pulse generating unit (200) enter into a first port of a circulator (207) after passing through a polarization scrambler (206), and enter into the sensing optical fiber (208) through a second port of the circulator; and backward scattered light of pulsed light in the sensing optical fiber (208) enter into a filter unit (209) through a third port of the circulator; light output by the filter unit and light output by a local oscillation light unit (210) are coupled into a detection and signal processing unit (217) through a coupler (216); and a pulse generator is used for driving a modulator to generate pulse and clock control. The sensing optical fiber in the OTDR can not only increase Brillouin threshold, but also reduce Brillouin frequency shift and bandwidth of a detector; and as a Brillouin ring-shaped cavity laser is designed to serve as local oscillation light concerned with detection, the bandwidth of the detector is greatly reduced, and the measuring accuracy of the Brillouin OTDR is improved.

The invention discloses a ultra-long-range (ULR) full-distributed optical Rayleigh and Raman scattering sensor fused with an optical Raman frequency shifter. Based on an optical Raman frequency shift theory and an optical Rayleigh and Raman fusion scattering sensing theory, an optical Raman frequency shifter is adopted, and an integrated optical wavelength-division multiplexing (WDM) and an optical time domain reflection (OTDR) principle are utilized to locate landmarks. The sensor comprises an optical pulse laser, the optical Raman frequency shifter composed of single mode fibers (SMF) and 1660mn bandpass filters, an integrated optical wavelength-division multiplexer, a sensor fiber, a photoelectric receiving module, a digital signal processor (DSP) and a computer. The sensor has the advantages of low cost, long service life, good signal to noise ratio (SNR) and good reliability, is simple in structure, and is applied to monitoring petrochemical pipes, tunnels, large civil engineering in 15-60km of long range and ultra long range and monitoring hazard forecast.

A setting method of a low-Brillouin scattering threshold sensing fiber-based optical time domain reflectometer contains the following steps: an optical pulse signal generated by an optical pulse signal generation unit (100) passes through a scrambler (106) and then enters a first port of a circulator (107); the optical pulse signal enters a sensing fiber (108) from a second port of the circulator; backscattering light of pulse signal light in the sensing fiber (108) enters a filter unit (109) through a third port of the circulator; signal light outputted by the filter unit (109) and light outputted by a local oscillator unit (110) are coupled through a coupler (117); and the signal enters a detection and signal processing unit (118) for acquisition and processing of the signal. The sensing fiber of the Brillouin optical time domain reflectometer adopts a single-mode sensing fiber, and the sensing fiber is a sensing fiber composed of multiple different Brillouin frequency shifts.

The invention relates to an all-fibre distributed cable safety and reliability monitoring system. The operation conditions of a power cable circuit in a power grid are subjected to omni-directional real-time intelligent monitoring by utilizing optical fibre sensors, and a research object is subjected to the researches, such as reliability analysis or fault diagnosis, according to a fused result byadopting an information fusion fault diagnosis technology so as to determine a fault more accurately without causing false alarm. The intelligent monitoring system can monitor the temperature, load carrying, stealing and invasion and the like of the power cable circuit and ensure safe and high-efficiency operation of the power grid; the information of various sensors is compressively analyzed andprocessed; and when an abnormal situation appears, corresponding linkage equipment is controlled to take certain measures to ensure the normal operation of the power grid. Meanwhile, aiming at the problems that missed alarm and false alarm are easily caused because of the damage to reality of power cable data, a prediction model of a sensor data stream and a prediction mechanism of the predictionmodel are given. When the prediction error of the model exceeds a preset threshold valve, the prediction model can be automatically adjusted, so that the quality of the information of the distributedoptical fibre sensors is improved, and effective modification can be performed when data abnormity appears; therefore, the defect rate of an optical fibre detection system is reduced to a certain degree; a large amount of field work is avoided; and the work efficiency is improved.

The invention discloses a pulse coding ultra-long-range fully-distributed optical fiber Rayleigh and Raman scattering sensor, which comprises a pulse coding optical fiber laser driving power, a pulse coding optical fiber laser, an integrated optical fiber wavelength division multiplexer, an optical fiber narrow-band reflection light filter, a pump-signal coupler, an optical fiber Raman laser, a sensor optical fiber, a photoelectric receiving module, a digital signal processor and an industrial computer. Based on a pulse coding principle, an optical fiber stimulated Raman amplification principle and an optical fiber Rayleigh and Raman fusion scattering sensing principle, the sensor positions a measuring point by using an optical time domain reflection principle. The signal-to-noise ratio of a sensor system is improved, and the measurement temperature and the strain accuracy are improved. The optical fiber laid on the spot is not electrified, resists electromagnetic interference, and is radiation-resistant and corrosion-resistant, so the optical fiber is not only a transmission medium but also a sensing medium. The sensor is low in cost, long in service life, simple in structure, good in signal-to-noise ratio and high in reliability, and is suitable for monitoring petrochemical pipelines, tunnels and large-scale civil engineering in an ultra-long-range 100-kilometer range, and monitoring hazard forecast.

The invention discloses a fiber Raman frequency shifter double-wavelength pulse coding light source self-correcting distribution type fiber Raman temperature sensor which comprises a pulse coding fiber laser driving power supply, a pulse coding fiber laser, a fiber shunt, a fiber Raman frequency shifter, two fiber wavelength division multiplexers, two fiber switches, a sensing fiber, a photoelectric receiving module, a digital signal processor and an industrial personal computer, wherein the sensor obtains a Raman relevant double-wavelength light source by the fiber Raman frequency shifter with a pulse coding fiber laser, bend because of fibers and optical cables and nonlinear loss caused by pressed stretching when a temperature measuring optical fiber cable is used on site are subjected to self correction. Measurement errors caused by deviation from linearity when a Stokes Raman reference channel demodulates an anti-Stokes Raman signal channel in the temperature measuring system are overcome. The fiber Raman frequency shifter double-wavelength pulse coding light source self-correcting distribution type fiber Raman temperature sensor has the advantages of low cost, long service life, simple structure, good signal to noise ratio and good reliability, and is suitable for monitoring petrochemical pipelines, tunnels and large civil engineering within the very long range of 80 kilometers.

The invention discloses a fully-distributed optical fiber sensor in combination of an optical fiber Raman frequency shifter and a Raman amplifier. After shifting frequency for 13.2 THz by the optical fiber Raman frequency shifter, an optical fiber pulsing laser produces a broad spectrum Raman laser with a 1660nm wave band, wherein the broad spectrum Raman laser is served as the broad spectrum light source of the fully-distributed optical fiber sensor for performing the incidence of a sensing fiber; the deformation and the breaking of the optical fiber can be detected based on the reverse Rayleigh scattering strength ratio of the sensing fiber; the 1550nm wave band produced in the sensing fiber undergoes reverse anti-Stokes Raman scattering and is amplified by the optical fiber Raman amplifier; the temperature information at each section of the optical fiber can be obtained by deducting the influence produced by straining according to the strength ratio of the anti-Stokes Raman scattered light to the Rayleigh scattered light; the inspection on the training and the temperature is out of cross effect; the detection point on the sensing fiber can be located by using an optical time domain reflection technology. The fully-distributed optical fiber sensor is applied to the monitoring of petrochemical pipes, tunnels and large-scale civil engineering within ultra-long range of 100 kilometers, as well as disaster prediction monitoring.

The invention discloses a pulse coding extra-long distance fully-distributed fiber Rayleigh and Raman scattering sensor of a fusion fiber Raman frequency shift device. The sensor comprises a pulse coding fiber laser drive power supply, a pulse coding fiber pulse laser, a fiber Raman frequency shift device consisting of a single mode fiber and a 1,660nm bandpass filter, an integrated fiber wavelength division multiplexer, a sensing fiber, a photoelectric receiving module, a coder-decoder demodulation digital signal processor and an industrial personal computer. The sensor is used for positioning a measuring point on the basis of a fiber Raman frequency shift device principle, a pulse coding principle and a fiber Rayleigh and Raman fusion scattering sensing principle by using an optical time domain reflection principle. The sensor has low cost, long service life, a simple structure, high signal-to-noise ratio and high reliability and is suitable for large-scale civil engineering monitoring and hazard forecast monitoring of petrochemical pipelines and tunnels within a long distance and extra-long distance 80-kilometer range.

The invention discloses a device for photonic band gap optical fiber backscattering distributed measurement, which comprises a light source, a 1:99 coupler, a measurement optical path circulator, a reference optical path circulator, a to-be-measured optical fiber, a Y waveguide, a signal generator, a detector, a lock-in amplifier, an electric delay line, a 1*N-path optical switch C, a 1*N-path optical switch D, an optical fiber total mirror and common single-mode optical fibers 1 to N. Low-coherence optical interference and square wave and triangular wave-joint modulation and demodulation related detection technologies are used, and high-spatial resolution and high-sensitivity photonic band gap optical fiber backscattering distributed measurement is realized. As the 1:99 coupler and the circulators are used for adjusting the splitting ratio of the reference optical path to the measurement optical path, the scattering signal intensity is improved, and the signal-to-noise ratio of the system is improved. Through combination of the electric delay line and the optical switches, on the premise of not influencing the system resolution, the sensitivity and the signal-to-noise ratio, the measurement length of the device is expanded.

The invention discloses a method for searching for a new mutation/SNP locus based on double-nucleotide pyrosequeneing-by-synthesis. According to the method, PCR is conducted on the genomic DNAs of a known sequence sample and a mixed sample, pyrosequeneing is conducted on obtained single-stranded PCR products according to a specific double-nucleotide adding method, each sample acquires two groups of double-nucleotide pyrosequeneing-by-synthesis information, and correction is conducted; the two groups of corrected mixed sample sequencing information are compared with the two groups of corrected known sequence sample sequencing information; if neither the two groups of mixed sample sequencing information nor the two groups of known sequence sample sequencing information are changed, it is indicated that the mixed sample sequencing information is consistent with the known sequence sample sequencing information, and no new mutation/SNP locus exists; if the mixed sample sequencing information is different from at least one of the two groups of known sequence sample sequencing information, it is indicated that the mixed sample sequencing information is not totally consistent with the known sequence sample sequencing information, and it shows that a new mutation/SNP locus exists.

The invention discloses a method for quantitative determination on methylation by two-nucleotide synthesis pyrosequencing. The method comprises the steps of performing two-nucleotide synthesis pyrosequencing on a PCR product generated by converting a gene group DNA (deoxyribonucleic acid) through a hydrosulphite, and continuously recording each sequencing reaction to acquire sequencing encoding information including types of two nucleotides and a nucleotide synthesis number thereof. Basic groups C in all CG locuses in a determined target area sequence are converted into T with different degrees, and then correlation analysis is performed by using the information acquired by two-nucleotide synthesis pyrosequencing, thus realizing quantitative determination on methylation in the target area sequence. The method can greatly improve a sequencing length, widens the analysis range of traditional pyrosequencing, and is suitable for methylation analysis of single-sample PCR products and mixed-sample PCR product sequences.