47results about How to "Realize long-distance measurement" patented technology

The invention discloses a bridge dynamic weighing method based on video measurement dynamic deflection, and the method comprises the steps: employing a first image recognition part which is disposed at the upper part of a bridge and covers a bridge surface region, and a second image recognition part which is disposed at the lower part of the bridge and at least covers the midspan part of a main beam below each lane; the method comprises the following steps: controlling the first image recognition part to obtain axle distance, vehicle running speed and vehicle running lane information of each axle; controlling the second image recognition part to acquire real-time dynamic deflection response of the midspan part of the main beam below each lane when the vehicle runs; according to the vehicledriving lane information, transmitting the axle distance of each axle, the vehicle driving speed and the real-time dynamic deflection response to a network cloud platform to realize one-to-one correspondence; by utilizing a Moses algorithm, the weight of the vehicle is calculated based on the wheel base, the vehicle running speed and the real-time dynamic deflection response, the method can solvethe problem of multi-lane and wide-bridge vehicle dynamic weighing, the measurement range is wide, the operation is simple, and the cost is low. The invention further discloses a bridge dynamic weighing system.

The invention discloses a high-speed camera shooting and PIV synchronous measurement system suitable for a moving boundary flow field, and belongs to the technical field of fluid mechanics experiments. The high-speed camera shooting and PIV synchronous measurement system suitable for the moving boundary flow field comprises a computer, a driving controller, a driving device, a water tunnel test section, a synchronous measuring device, a PIV camera, a laser generator and a high-speed camera. Through the perspective effect of a one-way transparent mirror, laser particle image velocimetry is carried out on a measured water wing flow field by the PIV camera, and through the reflection effect of the one-way transparent mirror, full flow field shooting is carried out on the measured water wing flow field by the high-speed camera so as to realize high-speed camera shooting and PIV synchronous measurement. By keeping a lens and a PIV shooting port of the PIV camera on a same shaft system and keeping a lens and a high-speed camera shooting port of the high-speed camera on a same shaft system, the accuracy of the synchronous measurement is ensured. The high-speed camera shooting and PIV synchronous measurement system suitable for the moving boundary flow field can realize the synchronous measurement of the moving boundary flowing-around flow field high-speed camera shooting and the laserparticle image velocimetry, the measurement efficiency is further improved, and the experimental data processing precision can be improved through the synchronous measurement.

The invention relates to a fiber-based atomic force microscope probe and an atomic force microscope system. The fiber-based atomic force microscope probe comprises a probe pin and a micro cantilever beam; and the probe pin is arranged at one end of the micro cantilever beam arranged at one end of a fiber. A fiber F-P cavity is formed between the micro cantilever beam and one end surface of the fiber by a connecting arm. And the micro cantilever beam is used for sensing a change of a distance between the probe pin and a sample. When the length of the F-P cavity changes due to deformation of the micro cantilever beam, the reflected light intensity is modulated by the fiber F-P cavity.

The invention relates to a fiber grating force-measuring anchor rod device. The fiber grating force-measuring anchor rod device comprises an optical fiber, a rod beam and a hollow anchor rod, wherein at least one grating is arranged on the optical fiber, gratings are adhered onto the rod beam, the rod beam penetrates through the hollow anchor rod, a limiting block is arranged at one end of the rod beam and is clamped on one side of the hollow anchor rod, a fastening nut and an end nut are in threaded connection with the rod beam, the hollow anchor rod is connected with an optical fiber base through welding, the optical fiber base is in threaded connection with an optical fiber base cover, the optical fiber base cover is provided with an optical fiber connection flange and is in threaded connection with a protective cover, and an optical fiber outlet is arranged on the protective cover. According to the fiber grating force-measuring anchor rod device, deformation data of the anchor rod device are collected through fiber gratings, and the optical fiber has the advantages of being good in lightning stroke resistance, high in anti-electromagnetic interference capability and capable of achieving remote measurement, so that the reliability and the measurement precision of the fiber grating force-measuring anchor rod device are improved, and the data transmission distance of the fiber grating force-measuring anchor rod device is increased.

The invention discloses a multifunctional downhole gas measuring device which comprises a downhole acousto-optic alarm, a detector, an electromagnetic valve, a plurality of gas suction ports, an infrared Fourier transform interferometer module, a gas extraction pipeline, an induced draft fan, a data collecting and processing module, an out-of-well alarm and a control host, the gas extraction pipeline is arranged at the top of a mine according to an operation area, the gas suction ports are arranged at the bottom of the gas extraction pipeline, and the infrared Fourier transform interferometer module and the detector are mounted oppositely on the side walls of the gas suction ports. The infrared Fourier transform interferometer module and the detector are utilized to perform spectral analysis on gas flowing through the gas suction ports, concentration of methane, oxygen, carbon monoxide and carbon dioxide in the coal mine is analyzed through the control host, and timely pre-warning can be realized owing to high spectral analysis speed.

The present invention discloses a two-wire system optical fiber sensing network basing on the method of frequency division multiplexing and a method thereof. The network is easy to be expanded. The optical spectrum signal which includes the measured physical quantity information is executed with effective amplification. The signal obtained by the receiving end is guaranteed to have high signal-to-noise ratio. The invention has the advantages of facilitated far transmission, easy maintenance, high reliability, and being suitable for the project application. The structure is that the network comprises two optical fibers which are independent from each other. One optical fiber in the two optical fibers is an energy optical fiber which is connected to the output end of the light source of the wideband, and is provided with a plurality of optical couplers a whereon. Each optical coupler a is connected with at least one sensor to realize the distributed measurement. The other optical fiber is a signal optical fiber which is also provided with a plurality of optical coupler b whereon. Each optical coupler b of the signal optical fiber is connected with the signal output end of each corresponding optical coupler a of the energy optical fiber to form a measuring node. Each measuring node respectively combines the output signal of the respectively corresponding optical coupler a to a beam through the optical coupler b which is arranged in the measuring node and transmits the beam to a digital demodulation system.

The invention discloses a sensitivity-enhanced quasi-distributed optical fiber pressure sensor which is insensitive to temperature, multiplexed, and adjustable in stressed area, measurement sensitivity and measurement range, low in cost, stable in performance and easy to replace, the pressure sensor comprises a pressure panel, an elastic cylinder wound with optical fibers, a reference optical fiber fixing groove, a bottom shell, a limit telescopic rod and a fiber optic adapter, the elastic cylinder wound with the optical fiber is positioned on the bottom shell; the pressure panel is positionedabove the elastic cylinder wound with the optical fiber; a rectangular through hole is arranged in the center of the elastic cylinder wound with the optical fiber; a reference optical fiber is arranged in the reference optical fiber fixing groove; a sensing optical fiber is arranged on the elastic cylinder wound with the optical fiber, the input and output ends of the reference optical fiber andthe sensing optical fiber are electrically connected with the fiber optical adapter, the limit telescopic rod is arranged between the pressure panel and the bottom shell. The sensitivity-enhanced quasi-distributed optical fiber pressure sensor can be applied to scientific research, measurement and detection of a power plant and a gas plant, etc.

The invention discloses a wireless passive detection system for the tension of a high-voltage transmission line, and the system comprises a tension sensor, a clamping and tension transmission mechanism, and a wireless reader. The tension sensor is installed at a to-be-detected part of the high-voltage transmission line through the clamping and tension transmission mechanism, and is in signal transmission connection with the wireless reader. According to the invention, the system employs a surface transverse wave strain sensitivity theoretical model, integrates the strain sensitivity and a frequency temperature coefficient, and is provided with the dedicated clamping and tension transmission mechanism for measuring the tension of the high-voltage transmission line, wherein the clamping and tension transmission mechanism can be conveniently installed at any detected point on the transmission line, and can prevent the bending moment and torque from affecting the measurement of tension. The wireless reader is used for remotely querying the frequency shift of an STW resonator installed on the transmission line, i.e., obtaining the tension value of a detected point. The wireless reader can be installed on a mobile platform, and can achieve the routing inspection of a surface transverse wave tension sensor at a place which is 10m far.

The invention, which belongs to the technical field of optical fiber optical measurement, specifically discloses a pile-based soil settlement monitoring system based on the optical fiber optical measurement technology. The system comprises a signal demodulation part, a network topology structure, a signal detection part and a measurement part. The signal demodulation part includes a broad spectrumlight source, a first connecting fiber, a second connecting fiber, a first fiber circulator, an adjustment arm, a data acquisition card and a computer. The network topology structure is formed by anoptical switch or a multi-channel divider and is formed by connection of a tree type structure. The signal detection part includes a plurality of detecting units; and each detection unit includes a second fiber circulator and a photoelectric detector. The measuring part includes a plurality of identical pile-based settlement sensors; and each pile-based settlement sensor includes a second opticalsplitter, a second self-focusing fiber collimator, a second reflector, a protective casing, a settling ring, and a pile. With the disclosed settlement monitoring system, problems that the measurementhas the error and real-time monitoring can not be realized in the prior art are solved.

The invention discloses an active measuring device of the end surface of a CNC internal grinding machine, comprising a machine tool chuck, a pressing cover, a regulating grinding head, a pneumatic micrometer, a positioning floral disc and a shaft coupler for coupling a head box of a machine tool. The end of the pressing cover with a milling flute is tightly matched with the positioning floral disc which is locked and fixed on an air pipe by a thread through hole on the pressing cover; the end of the pneumatic micrometer with the air pipe is inserted into a main shaft from one end of the machine tool chuck and is fixed on the shaft coupler on the end of the machine tool; three air hole branches on the other end of the air pipe are locked on the rest thread holes of the positioning floral disc and sealed by corresponding positioning bolts internally provided with ventilating holes; the regulating grinding head is positioned near the positioning floral disc; the air flow of the pneumatic micrometer is introduced by the shaft coupler with an air pipe connector and enters the space between the positioning floral disc and the pressing cover by the air pipe; the air flow is branched on the three air holes on the positioning floral disc by the air pipe and the blocked size of air flow quantity responds to the flopping size of a measured end surface. The active measuring device effectively enhances the labor efficiency and reduces the labor strength and the potential safety hazard.

The invention belongs to the technical field of analytical chemistry, and relates to a method for detecting the content of nitrate radicals in high-level liquid waste. The detection method comprises the following steps: (1) detecting the Raman spectra of standard solutions containing different concentrations of nitrate radicals, and drawing a working curve of the peak area or the peak height and concentration relationship of the nitrate radicals at 1047 cm<-1>; (2) detecting the Raman spectrum diagram of the high-level liquid waste to obtain the peak area or the peak height at 1047 cm<-1>; (3)calculating the content of the nitrate radicals in the high-level liquid waste according to the peak area or the peak height of the sample at 1047 cm<-1> and the working curve. The detection method can be used to accurately detect the content of the nitrate radicals simply and rapidly without the interference of interfering substances in the high-level liquid waste.

The invention discloses a natural gas leakage warning monitoring apparatus based on an optic-fiber FP cavity-type probe, and relates to the technical field of warning monitoring. The apparatus includes a laser device, which is respectively connected with a signal generation module and a laser device driver; the laser device drives a sensor group, wherein conversion and demodulation of signals between the laser device and the sensor group are carried out through a laser processing system; the laser processing system sends the signal, detected by the sensor group, to a photoelectric detector, then the signal is converted into an electric signal thereby; the electric signal is amplified and sent to a data collection module through a pre-amplifier; the data information collected by the data collection module is sent to a control center to process the signal. In the invention, a plurality of sensors are driven by one laser device, so that the apparatus can supply sufficient laser energy, can achieve long-distance detection and multi-point time-sharing measurement; the sensors and transmission signal both belong to optic-fiber medium, so that the apparatus is passive and has intrinsic safety. The apparatus is suitable for flammable and combustible sites, such as petrochemical engineering, due to the whole optic-fiber networking manner.

The invention provides a gas pressure monitoring system based on an optical fiber white-light interference measuring technology. The system comprises a white-light interference demodulator, an opticalfiber topology network and a gas pressure sensor set, the white-light interference demodulator comprises a white-light light source, a first optical fiber circulator, a second optical fiber circulator, a first optical fiber semi-reflecting mirror, a reflector, a first self-focusing lens, a stepping motor, a data acquisition card, a photoelectric detector and a computer, the optical fiber topologynetwork is formed by connection of optical switches or multiple channels of shunts in a tree-shaped structure, the gas pressure sensor set comprises a plurality of same gas pressure sensors, and eachgas pressure sensor comprises an elastic film, a reflective coating, a sensor housing, standard gas pressure inert gas, transparent glass, a second optical fiber semi-reflecting mirror and a second self-focusing lens. According to the gas pressure monitoring system based on the optical fiber white-light interference measuring technology, the gas pressure in a pressure container is monitored by employing the optical sensors so that the system is more applicable to pressure monitoring of gas pressure containers in severe conditions.

The invention relates to a photogrammetry device. In order to overcome the defect that an existing method of conducting fracture ductile fracture area percentage measurement through a film type camera is not suitable for radioactive impact specimen measurement, the invention provides an impact specimen fracture picture taking device. The impact specimen fracture picture taking device comprises a stepping motor control system, a camera control and digital image collecting system, a stepping motor, an industrial digital camera, a continuous zooming and amplifying lens, a camera lifting platform, an annular LED visual light source, a pull rod, an impact specimen clamping base and a clamping base rail. The picture taking device is suitable for measuring the impact specimen fracture ductile fracture area percentage, and measurement data can be easily stored; the camera shooting quality of the appearance of a fracture can be directly determined in the measurement process, and adjustment can be directly conducted when imaging is not clear; the measurement accuracy for the impact specimen fracture ductile fracture area percentage is high, and data accuracy is high; the picture taking device is easy to operate in the use process, and long-distance measurement of an impact specimen with the large radioactive dosage can be achieved.

The invention discloses a motion measuring device of a live-line object, and relates to the technical field of motion measuring devices. The motion measuring device comprises a collector, a filtering and amplification unit and a detection unit connected successively; the collector comprises an antenna and an anti-interference support, and the antenna is hung on the anti-interference support via a non-conducting connecting band; the filtering and amplification unit is connected with the antenna, and comprises a low-pass filtering circuit and an amplification circuit connected successively; and the detection unit detects a current/voltage filtered and amplified by the filtering and amplification unit. A motion measuring method of an electrostatic body can realize long-distance contact-free measurement. The motion measuring device of the live-line object can capture electric field change generated during motion of the live-line body, and motion is converted into current/voltage change via filtering and amplification.

The invention relates to a flexible bearing bore diameter measuring clamp and a working method thereof. The flexible bearing bore diameter measuring clamp comprises a locating pillar (1), a base (2) and an air pipe (3); the locating pillar (1) is provided with an annular boss (5); a flexible bearing is put on the annular boss (5) in a sleeving manner and is supported and located by the annular boss (5); the side wall of the annular boss (5) is provided with a plurality of air holes (4) which right face the inner wall of the flexible bearing without contact with the flexible bearing; air outputby a pneumatic measuring instrument comes out from the multiple air holes (4) via the air pipe (3) and works on the bore diameter of the flexible bearing. The clamp has the advantages that the magnification times of the pneumatic measuring instrument are greater, human error is small, the measurement precision is not influenced, and there is no mechanical friction during work so that there is nohysteresis error.

The invention belongs to the technical field of radioactive substance measurement and relates to a method for determining concentrations of uranyl nitrate and nitric acid in an aqueous phase at the same time. The method comprises the following steps: (1) preparing a series of nitric acid solution and uranyl nitrate solution with known concentrations; (2) respectively determining Raman spectra of the nitric acid solution and uranyl nitrate solution with the known concentrations; (3) creating a standard curve of a nitrate concentration; (4) creating a standard curve of a uranyl ion concentration; (5) determining a Raman spectrum of a sample and calculating ANO<3->/AH2O and AUO2<2+>/AH2O; and (6) calculating the concentrations of uranyl nitrate and nitric acid in the sample. By utilizing themethod for determining the concentrations of uranyl nitrate and nitric acid in the aqueous phase at the same time, direct measurement, no pretreatment, high selectivity and high measurement speed canbe realized, and an optical fiber can be introduced for realizing remote measurement.

The invention discloses a transceiving split five-degree-of-freedom measuring device and method with optical path drift compensation. The measuring device comprises a laser emitting end and a laser receiving end, wherein the laser emitting end is composed of a laser device, a first prism reflector, a first spectroscope, a second spectroscope, a second prism reflector, a fourth spectroscope, a second convex lens, a second two-dimensional position sensitive detector, a third convex lens and a third two-dimensional position sensitive detector; and the laser receiving end is composed of a third spectroscope, a first four-quadrant detector, a first convex lens, a first two-dimensional position sensitive detector and a second four-quadrant detector. When the measuring device is used, the laser emitting end is installed at a fixed position of a to-be-measured shaft of a numerical control machine tool, and the laser receiving end is installed on a sliding table of the to-be-measured shaft of the numerical control machine tool. The measuring device can realize simultaneous measurement of the pitch angle, the deflection angle, the roll angle, the horizontal straightness and the vertical straightness and realize remote measurement. The influence of laser angle drift on five-degree-of-freedom measurement can be eliminated, and the measurement precision is improved.