129results about How to "Real-time online measurement" patented technology

The invention discloses a size and shape online visual measurement system of ceramic tile; it was installed with two horizontal guide rails and two vertical guide rails fixed on the frame above the belt conveyer, the two vertical guide rails were installed with slide rails, slide rail on each vertical guide is set with two fore and after sliding block, each sliding block was installed with camera erecting fixture adjustable for height with a CCD camera fixed on it, four CCD camera were connected with computer image acquisition module, each CCD camera take a picture of angle of tile. The present invention overcomes the error of optical imaging, as well as the shortcomings of low measurement accuracy induced by the larger the tiles, the lower the measurement accuracy was, to achieve the measuring accuracy of 0.05 mm; as it simply only measure the size and shape, its detection speed was more faster, can less than 500 ms, can achieve real-time measurement in the ceramic tile production line.

The invention belongs to the measurement technical field of atmosphere environment quality, which specifically relates to an online automatic measuring system for environment air quality based on low-temperature condensing method sampling. The system is composed of a low-temperature condensing sampling system and an analyzing system; the low-temperature condensing sampling system comprises a drying pipe, an electronic cold trap and a low-temperature low trap that are connected in turn; the drying pipe is connected with an air inlet pipeline for removing vapor and condensing the environment air sample at low temperature; the analyzing system comprises a light source, a sampling battery, an optical spectrum instrument and a computer; the analyzing system splits and detects the air condensed by the sampling system through the optical spectrum instrument by the ultraviolet function from the light source and then analyzes the air by the computer. The system is high in integrated degree and measuring efficiency, which is suitable for continuous, real-time and online measurement of various pollutants of atmosphere environment (including sulfur dioxide, nitrogen dioxide, ozone, ammonia, formaldehyde and part of benzene series) in environment air.

The invention discloses a machine vision based turn plate angle high-precision online measurement method. Real time image collection is performed on mark round hole points in a turn plate by utilizinga monocular industrial camera. Through vision and image metrology analysis on acquired images, position information of the mark round hole points in the turn plate can be obtained. Then rotation angle information can be calculated through a geometric method. The advantages of the invention achieved in angle measurement include high measurement speed and realization of real time online measurement; avoidance of influence and damage to working piece surface through implementation of a measurement function by adoption of a non-contact technology; and elimination of interference on measurement results due to lighting environment complexity, spray liquid, water spots and the like in a production field through adoption of an improvement algorithm in the highest level.

The invention relates to a monocular vision box body volume measuring method based on multi-line structural light image recognition. The monocular vision box body volume measuring method comprises thefollowing steps that (1) a camera is calibrated, and multi-line laser plane parameters are acquired; (2) calculation of mapping of two-dimensional coordinates to three-dimensional spatial coordinatesis conducted; (3) the box edges are detected and the laser central line is extracted by using a deep learning method; and (4) structural light with a well shape, structural light with a dual-parallel-line and structural light with a cross shape are correspondingly used for measuring different box bodies to obtain the volumes of inerratic box bodies. According to the monocular vision box body volume measuring method based on multi-line structural light image recognition, the multi-line structural light (the well shape, the cross shape and the parallel line shape) is casted on the measured boxbody plane, intersection points of the line structural light and the edges of the boxed are detected through imaging processing, the points are converted from the two-dimensional coordinates to three-dimensional spatial coordinates according to a structural light triangulation measuring theory to calculate the lengths, the widths and the heights of the inerratic box bodies, and the volumes are further calculated. According to the monocular vision box body volume measuring method based on multi-line structural light image recognition, the complexity of the algorithm is low, the method can be greatly applied to PC terminals and mobile terminal devices, real-time on-line measuring can be conducted, and the requirement of portability is met.

The invention discloses an SF6 gas leakage on-line monitoring and alarming system. The SF6 gas leakage on-line monitoring and alarming system consists of a remote end and an on-site end which are connected through a data wire, wherein the on-site end comprises an ultrasonic measurement module, an infrared measurement module, an ARM controller, an RS485 communication module, a relay control module, an AC220-DC24 / 5V switching power supply and an AC220V wiring terminal; the remote end comprises a remote control module and a data analysis module. In the detection of the SF6 gas leakage on-line monitoring and alarming system, an infrared measurement principle and an ultrasonic measurement principle are reasonably combined; a detection process of the system comprises ultrasonic measurement first, and then if SF6 concentration is detected to exceed a standard, then infrared measurement is started, so that the problem that the expense is relatively high due to frequent measurement is solved, the ultrasonic measurement can be supplemented so as to improve the detection precision; therefore, the detection method makes full use of the advantages of the ultrasonic measurement and the infrared measurement, the defect that in the prior art, the SF6 concentration is measured by a single sensor is overcome, and the precision and flexibility of SF6 concentration detection are improved.

The invention discloses a corrugated diaphragm type pipe external pressure sensor, an oil-water well casing external pressure monitoring device and an oil-water well casing external pressure monitoring method, which belong to the technical field of fiber optical sensing and aim to solve the problems that the conventional pressure monitoring of an oil-water well casing only can be performed at a single point in the casing and that real-time online monitoring cannot be performed. An optical fiber and a fiber Bragg grating are arranged in a central cavity of a corrugated diaphragm type pipe external pressure sensor substrate, and are packaged with fiber reinforced plastic intellectual ribs. The two ends of the substrate fixedly clamp the intellectual ribs by expansion bolts respectively. A contact terminal hole is reserved in the center of the sidewall of the substrate. A pressure contact terminal is arranged in the contact hole. Two contacts of the pressure contact terminal are connected to the FRP intellectual ribs in a contacting way, and longitudinally stridden at the two ends of the fiber Bragg grating. A gap between the internal corrugated surface of a corrugated diaphragm at an orifice of the contact terminal hole and the surface of the outer wall of the pressure contact terminal is equal. The corrugated diaphragm type pipe external pressure sensor is adopted in both the oil-water well casing external pressure monitoring device and the oil-water well casing external pressure monitoring method. The corrugated diaphragm type pipe external pressure sensor, the oil-water well casing external pressure monitoring device and the oil-water well casing external pressure monitoring method are used for pressure monitoring.

The invention relates to a method and a device for testing fluorescence life time by utilizing simple configuration. The device comprises a sample carrying unit, an excitation unit, an imaging unit and a data processing unit, wherein a fluorescent sample is placed on the sample unit; the light source of the excitation unit is used for exciting the fluorescence of the sample; then the light source is turned off, and the fluorescence emitted by the sample is imaged in real time by using a measuring unit and the imaging unit, so as to obtain series of images showing that fluorescence intensity changes with time; the fluorescence life time can be calculated by utilizing the series of images. Compared with other methods and devices, the method and the device provided by the invention have the advantages that the device is simple, the cost is low, the operation is easy, and fast and high-flux real-time on-line measurement can be realized.

The invention discloses an on-line measurement method for dynamic impedance of a battery. The method comprises the following steps: a multi-tone excitation signal is synthesized by using sinusoidal signals of multiple frequencies and phases; through FFT impedance spectrum time domain measurement, a multi-tone excitation signal is used as input, and battery impedance under multiple frequency pointsis measured at the same time; battery impedance measurement is carried out in the operation process; during measurement, signal amplification power supply devices are connected to the two ends of a battery, and excitation signals are amplified and then superposed at the two ends of the battery; during measurement, direct-current signals of the battery serve as bias signals to be filtered out, only alternating-current components of voltage / current need to be tested, FFT conversion is conducted according to the measured alternating-current components, and the dynamic impedance of the battery isobtained through calculation; dynamic impedance measurement is carried out through parallel connection and series connection of a plurality of batteries; impedance of a plurality of frequency pointscan be measured at one time, the measurement time of battery impedance is greatly reduced, the impedance of the battery under the action of charging and discharging current can be better reflected, and real-time online measurement of the battery impedance can be realized.

The invention discloses a resonant tuning fork liquid density sensor with piezoelectric actuation and piezoelectric detection, comprising a tuning fork body, a clamped body, a piezoelectric actuator, a piezoelectric vibration pickup, and a temperature sensor, wherein, the piezoelectric actuator and the piezoelectric vibration pickup are arranged on the clamped body, the generated alternating force is transmitted to the tuning fork body by the piezoelectric actuator to let the tuning fork body produce simple harmonic vibration with intrinsic frequency itself; when immersing the tuning fork body in a liquid under test, the additional mass of the tuning fork body changes so as to let the vibration frequency of the tuning fork body change; by picking up the vibration signal with the piezoelectric vibration pickup, the detection of the vibration frequency of the tuning fork body is realized; because the vibration frequency of the tuning fork body is a monotone function of the liquid density, thus the real-time on-line detection of the liquid density is realized; and the temperature sensor is arranged on the clamped body for real-time detection of the temperature of the liquid under test, and is used for compensating the variation of the elastic modulus of the tuning fork body. According to the invention, the high precision on-line detection of densities of various liquids at different temperature can be realized.

The invention is suitable for the fields of information security and integrated circuits, and provides a high-stability strong physical unclonable function circuit and a design method therefor. The physical unclonable function circuit comprises a time delay generation module, a time delay comparison module, a response calculation module and a stability judgment module, wherein the time delay generation module is used for transmitting the same jump through a plurality of time delay paths according to an input stimulus of the strong physical unclonable function circuit and generating a plurality of time delay values; the time delay comparison module is used for selecting out multiple pairs of time delay values from the time delay values, performing time delay difference comparison and dividing the time delay differences of the pairs of time delay values into a plurality of grades according to difference values; the response calculation unit is used for calculating an output response of the strong physical unclonable function circuit according to the time delay difference grade of each pair of time delay values; and the stability judgment module is used for judging whether a stimulus response pair is stable or not according to the time delay difference grade of each pair of time delay values. According to the circuit and the method, while the attack resistance of the strong physical unclonable function circuit is ensured, the time delay difference can be measured online in real time, so that the stability is greatly improved.

The invention discloses a high-precision real-time three-dimensional color measurement system and method based on multiple angles of view. The system comprises four black-and-white cameras, a color camera, a projector and a computer. The four black-and-white cameras are symmetric about the central axis of the projector, and two black-and-white cameras are placed on each side of the projector. Thecolor camera is arranged on either side and located outside the black-and-white cameras. All the cameras are connected with the computer through data lines and connected with the projectors through trigger lines. The projector projects three phase shift stripes and generates a trigger signal of which the rate is the same with the projection rate. The trigger signal is transmitted to the four black-and-white cameras and the color camera through the trigger lines. All the cameras simultaneously take phase shift images projected by the projector and modulated by a measured object under the driveof the trigger signal. The phase shift images are transmitted to the computer through the data lines. The computer processes the phase shift images to obtain a color texture mapping. High-precision real-time measurement is realized under the premise of the highest measurement efficiency of the phase shift profilometry.

The invention relates to a high-temperature thin-film thermocouple temperature sensor manufactured by the vacuum film technology. The high-temperature thin-film thermocouple temperature sensor is that the part of which the temperature is to be detected is selected from a high-temperature detecting material; the specific shape of a Pt thermocouple electrode and a PtRh thermocouple electrode; then the processes of processing a metal mask, preparing an Al2O3 insulating layer, preparing a Pt thermocouple film, preparing a PtRh thermocouple and preparing an Al2O3 insulating protecting layer are sequentially carried out to prepare the micron or submicron thin-film thermocouple temperature sensors employing the Pt material and the PtRh material. Compared with the prior art, the high-temperature thin-film thermocouple temperature sensor has the advantages of being reasonable in structure, convenient to operate, long in service life, fast to respond in temperature detection, and high in temperature detection accuracy, and the upper limit of temperature detection is up to 1200 DEG C.

A swing-type measuring head robot online measuring system for body-in-white dimension measurement belongs to the technical field of optical measurement, mechanical engineering and vehicle engineering. The system provided by the invention comprises two swing-type measuring heads, two six-axis robots, two robot control cabinets and a system control cabinet. Based on a line laser scanning three-dimensional visual measuring technology, the two robots respectively carry the swing-type measuring heads to move to an assigned measuring position. A line laser projector projects a line laser to a body-in-white assembly feature. A single-shaft rotary table drives the line laser projector and a monocular camera to swing so as to realize scanning. After the monocular camera acquires a group of light knife images, online measurement of the body-in-white assembly feature is realized through light knife point cloud extraction, triangulation theory, point cloud integration and assembly feature parameter calculation. During the measurement, pose of the swing-type measuring heads is free; influence of environment and illumination factors is little; there is no robot scanning error; stability is high; and real-time and reliable measurement data is provided for the body-in-white dimension detection.

The invention discloses a measuring device and method for a hearth velocity field of a combustion boiler by using an acoustic method. 8 groups of acoustic wave transmitters (2) and acoustic wave receivers (3) are uniformly arranged on four walls of a same cross section of a hearth to form 24 interlaced acoustic wave transmission paths in a plane; a plurality of the acoustic wave transmitters (2) are respectively connected with the output end of a power amplifier (1) through an I / O (Input / Output) card (6) of a computer; the power supply ends of a plurality of the acoustic wave receivers (3) are respectively connected with the output end of a switching power supply (4); the signal output ends of the plurality of the acoustic wave receivers (3) are respectively connected with the computer (5) through an A / D (Analog to Digital) card (7); and the computer (5) is connected with a corresponding voice frequency input port of the power amplifier (1) through a D / A (Digital to Analog) card (8). The invention has the advantages of real-time and strong representation property to continuous fields; meanwhile, the technology has no requirements for measured flow field medium and environments, and the measuring device has the characteristics of small size, convenience for installation, low system cost and the like; and particularly, the invention has more advantages in detecting a hearth temperature field of a large coal-fired boiler in a power station.

A diabetes diagnostic system for detecting respiratory gases based on an electronic nose.The diabetes diagnostic system comprises a respiratory gas collecting module, a gas information acquiring module, a feature extracting and screening module and a mode recognizing module, wherein the respiratory gas collecting module collects respiratory gases into a gas bag through a respiratory gas exchanging device; the gas information acquiring module is used for reacting sensitive gases in the respiratory gases sent by the gas bag through a micro-cantilever resonant type gas sensitive sensor, converting concentration information of the sensitive gases into corresponding resonant frequency signals and sampling the resonant frequency signals; the feature extracting and screening module conducts feature extracting and feature screening on the sampled signals, the signals subjected to feature extracting and screening are transmitted to the mode recognizing module; the mode recognizing model conducts training and recognizing on acquired data through a mode recognizing method.The system can achieve quick non-invasive diagnosis on diabetes, and has the advantages that the noninvasion is achieved, price is low, reliability is high, real-time online measuring and portable design can be achieved, the analysis time is short, and operation is easy.

The invention discloses a self-mixing interference orthogonal detection vibration measuring device and method. A single-mode semiconductor laser diode adjustable in constant current source control outputs incidence laser, one part of the incidence laser is reflected to a second photoelectric diode, and optical signals are converted into current signals which are detected by a second photoelectricdetection module and fed back to a collecting module; the other part of the incidence laser is irradiated on the surface of a to-be-detected object and is reflected to a first photoelectric diode according to the original path, and the optical signals are converted into the current signals which are detected by a first photoelectric detection module and fed back to the collecting module. Comparedwith a traditional self-mixing measuring device, the self-mixing interference orthogonal detection vibration measuring device has the advantages that the orthogonal self-mixing signals can be acquired, inverse tangent demodulation of the vibration signals is completed, signal demodulation difficulty of the system is reduced, high displacement resolution is achieved, demodulation precision of the vibration signals of the system is improved, and real-time and online measuring can be realized.

The invention provides a circumference measurement method and device of a spiral tube. The circumference measurement device comprises a detection device, a signal transmission device, a first target object, a second target object and a controller. The detection device can detect the spiral length of the spiral tube during rotation and is connected with the controller. The signal transmission device can transmit a signal. The first target object and the second target object are arranged on the wall of the spiral tube, can rotate along with the spiral tube, and respectively reflect the signal. The controller can obtain the spiral length and the tube circumference of the spiral tube rotating for any circle according to the spiral length of the spiral tube detected by the detection device when the first target object and the second target object respectively reflect the signal. By means of the technical scheme, circumference parameters such as the circumference, the diameter and the circumference error of the spiral tube can be measured accurately in a real-time and online mode, so that timely adjustment can be performed on a manufacture device of the spiral tube, installation errors can be eliminated, and manufacture accuracy of the spiral tube can be improved.

The invention relates to a combined annular mist flow phase-splitting flow measuring method. The combined annular mist flow phase-splitting flow measuring method comprises the following steps: measuring an average liquid membrane thickness of an annular mist flow in real time by using two pairs of electric conductive annular wall-attached sensors; performing relevant analysis on signals measured by the two pairs of front and back annular electric conductive sensors according to a relevant speed measuring method to obtain an average liquid membrane interface flow rate, and solving a mass flow of a liquid membrane according to the average liquid membrane thickness and the liquid membrane interface flow rate; acquiring gaseous phase density by using a vortex sensor; obtaining a read gaseous phase flow through calculation; and using the measured liquid membrane flow, the read gaseous phase flow rate and the read gaseous phase flow as known quantities, performing the iterative solution on an entrainment rate E and a reading coefficient OR by using a formula until the entrainment rate is converged, and finally calculating a total liquid phase flow according to the entrainment rate, so that the measurement objective of the annular mist flow phase-splitting flow can be achieved.

The invention discloses a measuring method of pulverized coal concentration. The measuring method comprises the steps that a wavelet neural network model is built, and training is conducted; wherein the wavelet neural network model comprises a cold primary air volume, a primary wind temperature, a coal feed quantity, a hot primary air volume, a coal mill inlet and outlet pressure differential, a coal mill outlet pulverized coal temperature, a separator outlet pressure and a total air volume which serve as wavelet neural network inputs and takes a concentration value of pulverized coal at the coal mill outlet as a wavelet neural network output; the trained wavelet neural network model is used for real-time online measuring of the pulverized coal concentration, newly sampled coal mill data serves as an input of the trained wavelet neural network model, and an output of the trained wavelet neural network model is the concentration value of the pulverized coal at the coal mill outlet. According to the measuring method of the pulverized coal concentration, dependence on a training sample set is low, the stability of the measuring method is high, the robustness is good, the method is not affected by field measurement environmental factors, and the error-tolerant rate is high; a wavelet neural network measuring system is simple in structure, convenient to install, free of interference of the field measurement environmental factors, high in sensitivity and low in maintenance cost.

The invention discloses an active leaked current on-line measurement method for a power distribution network, and the method is used for the measurement of the active leaked current of a grounding distribution network where a neutral point is in series connection with a damping resistor through an arc extinguishing coil. The method comprises the steps: injecting a non-power-frequency specific frequency current signal to the distribution network through the zero-sequence voltage transformer of the distribution network; measuring a returned voltage signal in the arc extinguishing coil through avoltage transformer; calculating the ground leakage conductance of the distribution network and the active leaked current of the distribution network. The method achieves the online measurement of theactive leaked current, does not need to change the primary side wiring of the distribution network during measurement, avoids the impact on the normal operation of the distribution network, can eliminate the impact from the internal impedance and damping resistance of the voltage transformer, and is simple, convenient, economical and precise in measurement.

The invention discloses a method for carrying out neutron measurement on uranium contents in uranium-containing liquid and an achievement device of the method. The objective of the invention is to solve problems of long analysis processes, tedious operation and failure to carry out safe online monitoring on nuclear borderlines in the current detection methods. The method comprises steps of using neutrons radiated by a neutron source to penetrate through a pipeline wall; allowing neutrons to react with uranium-containing liquid in the pipeline; measuring the neutron counting rate N-measurement in the pipeline through a neutron detector, and calculating the uranium contents NU in the pipeline according to a calculation model shown in the description, wherein the phi heat is the average neutron injection rate in the pipeline, the sigmaf is the micro cross section, the t is the measurement time and the y is the average released neutron number of fission of every time. According to the invention, the method and the device are advantaged by capability of achieving real-time and online measurement on uranium concentration in the uranium-containing liquid.

The invention discloses a multi-view-based full-automatic multi-modal three-dimensional color measurement method. The method comprises the following steps: firstly performing phase-shift profilometryby adopting a three-step phase-shift method, and performing Fourier profilometry by utilizing the second fringe in the three-step phase-shift and adding an all-white graph, and unwrapping phase basedon a stereo phase unwrapping method; and then judging a movement region of a measured object pixel by pixel through the change of two adjacent moment phases; acquiring the high-precision profile by utilizing the phase-shift profilometry when measuring a static object; and effectively extracting the motion object profile by utilizing the Fourier profilometry when measuring a dynamic object. The advantages of the Fourier profilometry and the phase-shift profilometry can be sufficiently utilized under a complex scene (the scene contains the moving object and the static object or the object is inmoving and static states at the same time), thereby obtaining a reconstruction result with better precision.

An in-line key parameters measuring method based on generalized prediction control for the process control of boiler or different industrial furnaces features that an in-line measuring model is disclosed.

The invention discloses a method for measuring switch latency of an intelligent substation by utilizing a network message analyzer to analyze message passing a switch. Online measuring of switch latency is achieved, and alarming can be sent when latency border crossing occurs. In addition, the original topological structure of the switch communication network is unaffected.

The invention relates to a device and a method thereof for acquiring a transmission fluctuation spatial correlation spectrum. A polychromatic light source is used for irradiation, when the light source passes through a dispersor, the distances between an incident light focus and reflected light focuses with different wavelengths in a measurement region are different, and thus the corresponding spatial correlations are different. An incident light beam and a reflected light beam are dispersed and absorbed in the measurement region under the action of particles, thereby causing extinction. A split light beam passes through a half reflecting and half transparent plain glass and is focused on a light sensing element by a lens, thereby obtaining a transmission correlation spectrum. The invention effectively solves the problem that the particle measurement range is limited because of mechanical operation in the measurement process. A transmission fluctuation spatial correlation spectral method is irrelevant to the flow field of the particles, has simple structure and can be used for detecting a particle system in laminar flow and onflow states in real time and on line, thereby testing the particle size distribution and the concentration of micron-sized particles. The invention can be widely applied to various fields of scientific research, production and process control of chemical industry energy sources, environment protection, water quality detection and particle measurement.

The present invention discloses a high-speed motion target deformation measurement system and method based on DMD, and belongs to the technical field of high-speed motion target deformation measurement. The system comprises a laser, a collimation and beam expanding module, a DMD scanning first-grade sub system, a projection screen, a reflection plate, a receiving detection first-grade sub system and a laser distance measuring instrument; and the DMD is employed to simulate a high-speed motion target with an unchanged position through adoption of a modulation pattern high-frequency loading mode, the optical path structure and parameters are fixed through adoption of a mode of system calibration and deformation measurement of the high-speed motion target with an unchanged simulation position, and a linear array CCD sampling frequency is employed to coordinate with the DMD frequency to achieve the target size intensity-pixel collection to achieve the data collection of the external physical deformation quantity of the high-speed motion target. The present invention further discloses a target deformation measurement method based on the system. The high-speed motion target deformation measurement system and method based on DMD can achieve the non-contact accurate measurement of the external physical deformation quantity of the high-speed motion target, and are high in measurement precision and fast in time.

The invention discloses a device and a method for counting micro-particles based on a micro-nanofiber. The device comprises a narrow linewidth laser, a fiber isolator, a fiber coupler, the micro-nanofiber, a signal light detector and a reference light detector, the coupled mode of the fiber coupler is 2X2, an output end of the laser is connected to the fiber isolator through a fiber and then connected to a first port of the fiber coupler, the signal light detector is connected with the micro-nanofiber and then connected to a third port of the fiber coupler, and the reference light detector is connected to a fourth port of the fiber coupler through a fiber. The device has the advantages that micron-diameter particles are sensed by the aid of large evanescent field of the micro-nanofiber, owing to high light confinement capacity and guide capacity of the micro-nanofiber, the shortcomings of scattered beam energy and difficulty in gathering and detecting scattered light of a traditional optical method are overcome, and difficulty in realizing high stability and resonance frequency of resonant quality sensing is avoided in principle.

The invention relates to a planar error detection system. Illumination light beams sent by a white light source pass through an illumination optical system, emergent parallel light passes through a half transparent and half reflecting mirror and an afocal object lens to be focalized on a detected object, light reflected by the detected object enters a color difference generation system, light with different wave lengths has different focuses for the same optical system and thus corresponds to different image distances, and only the light with the corresponding wave length can be allowed to pass through a slit because of the confocal principle. The light with the corresponding wave length is imaged on special positions of a face array image sensor through a light splitting optical system, and image signals in special positions of the image sensor are sent into a computer to be converted into corresponding wave length signals. A confocal light path is adopted, and an ordinary white light source is adopted. Compared with other methods adopting a single-color laser light source, the invention has the advantages of practical and popularization value and high measuring precision, can reach the nanometer level precision through computer analog simulation, and can realize real-time on-line roughness detection.

The invention discloses a rapid vision measuring system and method for high-temperature forging line reconstruction size, which belong to the field of size measurement of high-temperature forgings, inparticular to three-dimensional reconstruction and size measurement using a line reconstruction method for the external contour of a forging. Firstly, a vision measuring system is built, and a visioncoordinate system is built; then, two cameras in the system are calibrated, and internal and external parameters of the two cameras are obtained to obtain the projection transformation from a world coordinate system in the two-camera model to a camera image plane coordinate system; a filter is added in front of a lens to suppress the influences of high-temperature radiation of the forging, and aprojector projects bright light on the surface of the forging to highlight the contour feature of a to-be-measured forging to improve the image quality; then, the contour line features of the forgingon left and right image planes are extracted; and finally, a forging three-dimensional space contour line is reconstructed according to the feature line corresponding to the left and right extracted images, the line outside the forging contour is trimmed off to obtain the reconstructed forging contour, the length of each forging section is calculated, and the size of each contour can be obtained.

The invention provides a reflective optical path device of an online laser gas analyzer. The reflective optical path device comprises a laser transmitting and receiving unit, a background removing unit, an online monitoring unit and a laser reflecting unit which are sequentially connected with one another. The laser transmitting and receiving unit comprises a tunable laser device, a first wedge lens, a reference cell, a first detector, a second detector and a third detector, and the directions of principle optical axes of the reference cell and the first detector and the direction of laser light emitted by the tunable laser device are symmetrical with one another relative to the normal of a first surface of the first wedge lens; the background removing unit comprises a second wedge lens; the laser reflecting unit comprises a third wedge lens and an optical corner reflector. The reflective optical path device has the advantages that optical distances of measured gas can be doubled, and accordingly the sensitivity and the detection limit of the analyzer can be greatly improved; the reflective optical path device is easy and convenient to mount and debug; the gas can be measured in an online manner in real time; the reflective optical path device has few optical components and is simple in structure, and optical paths can be debugged and mounted by unprofessional people.