705results about How to "Quick measurement" patented technology

A method and system for full-field fringe-projection for 3-D surface-geometry measurement, referred to as “triangular-pattern phase-shifting” is disclosed. A triangular grey-scale-level-coded fringe pattern is computer generated, projected along a first direction onto an object or scene surface and distorted according to the surface geometry. The 3-D coordinates of points on the surface are calculated by triangulation from distorted triangular fringe-pattern images acquired by a CCD camera along a second direction and a triangular-shape intensity-ratio distribution is obtained from calculation of the captured distorted triangular fringe-pattern images. Removal of the triangular shape of the intensity ratio over each pattern pitch generates a wrapped intensity-ratio distribution obtained by removing the discontinuity of the wrapped image with a modified unwrapping method. Intensity ratio-to-height conversion is used to reconstruct the 3-D surface coordinates of the object. Intensity-ratio error compensation involves estimating intensity-ratio error in a simulation of the measurement process with both real and ideal captured triangular-pattern images obtained from real and ideal gamma non-linearity functions. A look-up table relating the measure intensity-ratio to the corresponding intensity-ratio error is constructed and used for intensity-ratio error compensation. The inventive system is based on two-step phase-shifting but can be extended for multiple-step phase-shifting.

Provided is a method for localization message process. The method includes allocating cluster resources for recognizing a location of a mobile node, setting operation of each node by deciding a cluster operation state for the mobile node, measuring distances between the mobile node to each of anchor nodes, and recognizing a location of the mobile node.

The invention discloses a method for measuring object deformation in real time, which comprises the following steps: arranging and adjusting measuring equipment, namely symmetrically arranging two cameras and corresponding LED illumination lamps above a measured object, and making optical axes of the two cameras intersected in a distance of 1 meter in front of the cameras; then calibrating the cameras, namely tightly sticking mark points to the surface of an object to be measured according to the size and shape of the measured object and the measurement requirement; next, placing the measured object stuck with the mark points under the two cameras in about 1 meter or moving the whole measuring equipment to make the measured object enter a measurement range and enable each camera to acquire the mark points on the surface of the measured object, starting the two cameras to shoot sequence images, and acquiring digital images; then identifying and positioning the images; reversely solving a projection matrix according to the calibration result of the cameras, and combining image coordinates of the solved mark points on the surface of the measured object on the images of the two cameras to reconstruct a three-dimensional coordinate of the mark points; and finally, carrying out deformation analysis and calculation for the mark points on the surface of the measured object.

A method for real-time optical diagnostics in laser ablation and laser processing of layered or structured materials or material structures. Diagnostics is provided during laser ablation that is utilized regularly in laser processing and/or chemical analysis of structured materials, by means of measuring optical emission generated as a result of the pulsed laser-material interaction in real time. The method can involve a single-layer-film or a stack of multiple layers or a structure of different domains. The method is particularly beneficial in fabrication of thin-film structures, such as photovoltaic and electronic devices or circuits of devices.

Systems and methods of the present invention measure at least one reflecting surface of an object disposed along an optical path. In some embodiments a measured optical interference signal for each of at least three wavelengths of reflected light may be used to determine a modulation of frequency components of a Fourier series. Frequency components of a Fourier series may be transformed to spatial components that describe intensities and positions of light reflected along an optical path. Systems and methods of the present invention permit rapid measuring and may monitor corneal thickness during surgery. The invention may do so by integrating an ablation device and a measurement apparatus into a single system. An integrated scanning and monitoring system may include an ablative light source producing an ablative beam and a measurement light source producing a measurement beam.

The invention discloses a video-image-based method for detecting a non-contact vital sign. The method comprises the following steps of: acquiring video images continuously according to a fixed frame frequency, detecting a region of interest (ROI) region automatically, separating a vital sign signal from a multichannel signal separated from the ROI region, extracting the frequency of the vital sign signal and converting the frequency into the vital sign to acquire a detection result. The invention also discloses a video-image-based system for detecting the non-contact vital sign. The method and the system have the advantages of quickness, real time, capacity of realizing continuous monitoring, high robustness, low cost, wide application range and the like.

The invention relates to a calibration technology for multiple structured light projected three-dimensional profile measuring heads, discloses a technology for calibrating multiple structured light projected three-dimensional profile measuring heads in different directions, which can be used for the quick label-free measurement of an object profile projected by structured light, and belongs to the technical field of optical measurement. In the calibration technology, only a calibration object of a plane with a plurality of calibration patterns is required to be designed and is not required to be manufactured into a high-precision three-dimensional target with known geometrical relationships on all surfaces; and geometrical parameters among all planes of the calibration object can be obtained by a close-range photogrammetry technology to upgrade the calibration object into the three-dimensional target, so the difficulty of machining and maintaining the high-precision three-dimensional target directly is reduced. By utilizing the technology, multiple structured light projected three-dimensional profile measuring heads can be measured from different visual angles in a label-free mode, and point clouds scanned in different directions are unified to one coordinate system automatically, so error accumulation caused by splicing is avoided effectively, and the time of the three-dimensional appearance reconstruction of the object can be shortened.

The electron beam is irradiated several times at predetermined intervals to the wafer surface on which the plugs are exposed in the course of the manufacturing process so that the pn junction is in the reverse bias state. Then, the irradiation conditions of the electron beam are changed while monitoring the charging voltage on the plug surface, and the secondary electron signals of the circuit pattern are obtained under the irradiation conditions that the charging is within a desired range, thereby evaluating the leakage property. Since the charging voltage of the pn junction is relaxed depending on the magnitude of the leakage current during the interval, the leakage property is evaluated based on the luminance signals of the voltage contrast image. By measuring the charging voltage and setting it within a desired range, the evaluation result reflects the state in the actual operation. Therefore, the accuracy is enhanced.

A method and apparatus are provided for measuring a parameter such as capillary pressure in porous media such as rock samples. The method comprises mounting a sample in a centrifuge such that different portions of the sample are spaced at different distances from the centrifuge axis, rotating the sample about the axis, measuring a first parameter in the different portions of the sample, and determining the value of a second parameter related to the force to which each portion is subjected due to rotation of the sample. In one embodiment, the first parameter is relative saturation of the sample as measured by MRI techniques, and the second parameter is capillary pressure.

The present invention provides a multi-wavelength interference real-time absolute distance measurement device on the basis of femtosecond optical comb synchronization frequency locking. The multi-wavelength interference real-time absolute distance measurement device on the basis of femtosecond optical comb synchronization frequency locking comprises: a multi-wavelength generator on the basis of the femtosecond optical comb synchronization frequency locking configured to emit a plurality of high-frequency stable object wavelength lasers; a heterodyne interferometer configured to receive lasers outputted by the multi-wavelength generator after the femtosecond optical comb synchronization frequency locking, returning measurement light and reference light after generation of interference through the heterodyne interferometer being coupled in single mode fibers by lens focusing to form mixed multi-wavelength heterodyne interference signals; and a synchronization phase demodulation module configured to separate the mixed multi-wavelength heterodyne interference signals obtained by the heterodyne interferometer through wavelength demodulation to obtain interference signals corresponding to each wavelength and perform synchronization phase measurement processing of the interference signals corresponding to each wavelength to finally obtain an accurate absolute distance value. The multi-wavelength interference real-time absolute distance measurement device on the basis of femtosecond optical comb synchronization frequency locking is high in traceability of values, high in measurement precision, large in non-fuzziness measuring range, fast in update rate and easy to measurement on site in real time, and is applicable to the fields of the industrial production, the equipment manufacture and the large-size precision measurement.

The invention discloses a new tricolor raster projection-based Fourier transform three-dimensional measuring method, which mainly aims to accurately work out the phase distribution of raster images, and then obtain the three-dimensional topography information of objects according to the phase distribution. The method is implemented through the steps of setting the gray values of R and G components in a projected raster to follow a sinusoidal variation regulation with two different frequencies, and setting a B component as the average value of the R component or the G component, and forming a color raster image to be projected on an object to be measured; and separating the three components of an acquired deformed color raster image, then processing the separated three gray images, meanwhile, restraining background components and high-frequency noises when the Fourier transform is used to calculate relative phases, and carrying out comparison and calibration on the three gray images with the relative phase values under the two frequencies when the phases are unwrapped so as to achieve the purpose of precisely calculating absolute phases containing height information. Only one raster image is required to be projected in the whole measuring process, therefore, the method of the invention is good in real-time.

The invention discloses an object size measurement method. A calibration object is placed near a target object, pixel sizes of the target object and the calibration object are calculated, the actual size of the target object is calculated, no measurement tool is needed, and the external size of a general object can be quickly and accurately measured. Meanwhile, the invention also discloses an image database data acquisition method based on the object size measurement method. When a database comprising a target object image sample and the size of the target object is built, automatic database construction can be realized, that is, the target object image sample and the size can be obtained at the same time at one time through photographing, corresponding database construction is realized, and compared with manual recording, the method of the invention is labor-saving and time-saving, and is less error-prone.

The invention relates to non-linear optical frequency conversion and the application of the non-linear optical frequency conversion and provides a method and a device which can widen the preparation requirements for a biological sample, do not need preparation of the sample, are high in measurement sensitivity, and can achieve high resolution, fast and real-time biological sample moisture content and distribution imaging measurement. The technical scheme is that the biological tissue moisture measurement device based on terahertz wave attenuated total reflectance (ATR) is composed of a tunable terahertz (THz) radiation source, a non-spherical face lens assembly, a total reflection prism, a two-dimensional mobile scanning platform, a terahertz wave detector and a computer. The total reflection prism is placed in the middle of the non-spherical face lens assembly, the face to be tested of a biological sample to be tested clings to the top face of the total reflection prism fixed on the two-dimensional mobile scanning platform, terahertz (THz) waves are projected to the terahertz detector through the non-spherical face lens assembly, and a detection result of the terahertz detector is output to the computer. The biological tissue moisture measurement device and the method based on the terahertz wave attenuated total reflectance (ATR) are mainly used for biological sample moisture content and distribution imaging measurement.

The invention relates to a wood automatic supervision method and a system which combines a laser contour detection, a machine vision recognition and an image processing technology, scans wood contour line for a laser scanning device used for train to transporting wood to gain cross section area of loading wood, uses a machine vision device to gain carriage length of the train, automatically gains volume of the loading wood. The invention also provides an automatic supervision method for yard logs or vehicle loading logs which process to scan for head faces of the logs, gain the cross section area of each log according to a head face image, and then try to obtain log volume according to the wood length, so as to realize the wood automatic supervision. The method and the system provided by the invention are applied to the customs, so as to reduce artificial examination strength of the customs system, improve examination accuracy, and effectively attack smuggling crime.

A high-speed measuring electronic digital outside micrometer allowing a user to make measurements quickly and effectively compared to conventional electronic outside micrometers with rotary thread spindles, which have limited measuring speed. This high-speed measuring electronic digital outside micrometer features: a linear motion digital sensor, a linear scale digital sensor, a linear motion digital sensor base, a digital display unit, an electronic processing unit, a micrometer body, a linear spindle, a linear spindle movement unit, a spindle control unit, a micrometer anvil, and retractable springs. In a stationary position, the measuring surface of the micrometer anvil and the linear spindle are in contact to the other. By operating the spindle control unit, it will create distance between the micrometer anvil and the linear spindle measuring surface. This distance is a measurable distance of the micrometer. By set free of the spindle control unit, the retractable springs will re-set the micrometer to its stationary position.

The invention relates to a high speed multi-dimensional vibration measuring device and method based on a stripe target. The device comprises a stripe target, an imaging module, a signal control and processing module and a display module. The method includes the following steps: arranging the stripe target on a vibration structure to be measured; adopting an image module to conduct continuous imaging and recording on the stripe target; utilizing the imaging module to transmit the image of the stripe target to the signal control and processing module; utilizing the signal control and processing module to conduct Fourier transform on the stripes at the same position of the same stripe target in each frame of the image, adopting a certain peak value frequency correction method to accurate correct the peak value frequency, and then utilizing the imaging mathematical relation and the corrected peak value frequency to obtain a time domain curve with stripe target structure vibration, namely acquiring structure vibration signals through reduction; displaying an image processing result through a display module or conducting further data processing through vibration signals. By means of the device and method, vibration measurement of points, lines and faces in certain range is achieved, the measurement speed is high, and the accuracy is high.

The invention provides a component different-surface-parallel-hole form and position deviation visual measuring method and device. The method comprises the following steps which are carried out in sequence: [1] binocular camera parameter calibration; [2] different-surface-parallel-hole feature analysis and treatment of a component entity image; [3] different-surface-parallel-hole match feature point extraction of the component entity image; [4] component different-surface-parallel-hole three-dimension information reconstruction, and analysis and calculation of form and position deviation parameters such as diameter, circular degree, hole pitch and depth distribution of holes. According to the invention, measurement of the component feature hole form and position deviation can be completed rapidly and effectively, precision requirements of high-precision measurement can be met, and advantages of simple measurement operation, low equipment maintenance cost and the like can be achieved.

The invention relates to braking process-based dynamic automobile gravity position detector and a method. The device consists of an axle weight, a braking force detector, an axle base measuring device, a wheel base measuring device and a data collection processing system; dynamic gravity detection algorithm is obtained by derivation on the basis of braking process, the device is applied to collect axle weight and braking force signals, axle base signals and wheel base signals, thus being capable of calculating the position of the automotive gravity. Based on the automotive gravity position calculation method, sideslip and rolling-over of vehicles can be analyzed to calculate limiting values of sideslip and rolling-over of vehicles under different road conditions and give out early-warning information to avoid occurrence of traffic accidents. The invention can be widely applied in safety driving control process of various vehicles.

Apparatus to treat an eye with an ophthalmic laser system comprises a patient interface having an annular retention structure to couple to an anterior surface of the eye. The retention structure is coupled to a suction line to couple the retention structure to the eye with suction. Liquid is added above the eye to act as a transmissive medium. A coupling sensor is coupled to the suction line to determine coupling of the retention structure to the eye. A separate pressure monitoring circuit having a much smaller volume than the suction line is connected to the annular retention structure to measure suction pressure therein. A system processor coupled to the monitoring pressure sensor includes instructions to interrupt firing of a laser when the pressure measured with a monitoring pressure sensor rises above a threshold amount.

The present invention relates to a quick frequency measurement system and its method, belonging to the field of communication technology. Said system includes frequency regulator, frequency measurer and control processor. Said invention utilizes the frequency regulator to regulate tested signal and reference signal, prolong testing time length of tested signal, raise frequency of reference signal so as to obtain high-frequency count pulse, then the frequency measurer can utilize the above-mentioned high-frequency count pulse to measure regulated tested signal.

The invention discloses a method for the online detection and total loss determination of the neutral current of a distribution transformer. Four precise split core type current transformers are used for respectively detecting the three-phase current and the neutral current, each harmonic component is obtained by using fast Fourier transform, a fundamental current is calculated, and then the iron loss, the copper loss, the neutral line loss and the earth current loss of the transformer are calculated according to each current, thus obtaining the total loss of the transformer. The method can effectively monitor and acquire the electric signal of the transformer, a DSP high speed central processor performs digital filtering on the electric signal, the anti-interference capability is improved, and the neutral current of the transformer and loss caused thereby are measured on line, realtimely, rapidly and accurately, providing necessary basis for the safe and stable operation of the transformer.

A group velocity dispersion measuring device capable of measuring group velocity dispersion (GVD) with a simple configuration and in a short time, comprising an FSF laser (FSFL) (2) for generating frequency chirp light, an optical amplifier (AMP) (3) for amplifying the frequency chirp light, an optical coupler (4), a circulator (5) for branch-controlling optical signals, a photodetector (6) for receiving a ray of light before and after its propagation through an optical fiber (1) to be measured, and an RF spectrum analyzer (RFSA) (7) for observing an optical spectrum waveform. Beat signals generated between chirp lights before and after the propagation, through the optical fiber (1) to be measured, of frequency chirp light emitted from the FSF laser (2) are alternately observed to calculate a GVD value from frequency differences between these beat signals.

The present invention discloses a multi-wavelength tunable micro-interference measuring method and a device thereof. A multi-wavelength tunable laser is modulated to output three paths of wavelength tunable laser signals in the synchronous or time-sharing manner. The three paths of wavelength tunable laser signals are compounded as one path of composite laser signals through beam-combining optical fibers, and the path of composite laser signals is focused and coupled to the surface of a frosted glass plate which is rotating at a constant speed. After that, the path of composite laser signals is incident to the surface of a beam splitter after being formed as the parallel light through a collimating beam-expanding lens. The light is reflected to enter an interference microscope, and then is irradiated onto the surface of a to-be-tested element on an objective table. A reflected signal sequentially passes through the objective lens of the interference microscope and the beam splitter to be coupled to the target surface of a color camera through an imaging lens. Finally, output signals are regulated and acquired data are synchronously controlled by a computer. According to the technical scheme of the invention, a plurality of different wavelengths are adopted by a single-wavelength tunable laser module, so that the optical phase shift and the multi-wavelength interference detection are realized. The method and the device are especially suitable for the fast and accurate measurement of microstructure elements which are complex and non-continuous in surface shape variation. Therefore, measurement errors, caused by the scanning motion of a mechanical component, can be effectively inhibited.

A method for distance measuring using at least two contact-less distance sensors, e.g., ultrasound sensors, is provided, which distance sensors each have one emitter for emitting measuring pulses (MI) and one receptor for receiving measuring pulse echos (ME). The distance from an obstacle that reflects the measuring pulse (MI) is determined from the time difference between the measuring pulse (MI) and the received measuring pulse echo (ME). A first measurement is performed, which involves alternatingly emitting by the at least two distance sensors the measuring pulses (MI) offset in time by a first offset, and subsequently receiving the measuring pulse echos (ME) by the distance sensors. In addition, a verification measurement is performed, which involves alternatingly emitting by the at least two distance sensors the measuring pulses (MI) offset in time by a second offset, which is different from the first offset in time used in the first measurement.

The invention relates to a method for automatically detecting and evaluating the color of a piece of laser beam emitting paper and the quality of laser beams. The method comprises the following steps: putting and fixing a piece of laser beam emitting paper to be detected on a measuring platform by adopting an automatic detection system; setting the number of measuring points and the measuring step length of a color measuring instrument in the horizontal and vertical directions on the measuring platform; controlling the displacing, positioning and measuring of the color measuring instrument in the horizontal and vertical directions automatically, and reading the color information of the measured sample in different positions; analyzing and calculating the chromatic value by using a computer to obtain the CIELAB or CIEDE2000 color difference of the measured sample in different measuring positions; drawing a color difference distribution diagram, and detecting the color uniformity and rainbow cycle of the single laser beam emitting paper and the quality of laser beams according to the periodic distribution rule and the peak distribution rule of the color difference distribution diagram. By adopting the method provided by the invention, the problems of measurement value uncertainty and human error can be solved, and automatic detection can be realized. The method is easy and convenient to operate and can be used for measuring normatively with a small error.

The invention discloses an ion beam automatic measuring system and method. Measurement probes for four parameters (beam intensity, emittance, energy divergence and monatomic ion ratio) of an ion beam are organically integrated in a vacuum chamber and are used for measuring beam intensity, emittance, energy divergence and monatomic ion ratio. The measurement probes for the four parameters are movable and are driven by a step motor, the operation of the step motor, and the acquisition and processing of measurement data are controlled by a computer. The invention has the advantages that all parameters of the ion beam can be measured under the state that an ion source stably operates without halting, assembly and disassembly procedures of all parameter measurement devices are reduced, damage to the ion source and the parameter measurement devices is reduced, and the convenience and the rapidness are achieved in a measurement process, and the influence of an environment factor is lowered, and the precision of parameter measurement is improved.

Gas analyzer systems and methods for measuring concentrations of gasses and in particular dry mole fraction of components of a gas. The systems and method allow for rapid measurement of the gas density and/or dry mole fraction of gases for a number of environmental monitoring applications, including high speed flux measurements. A novel coupling design allows for tool-free removal of a cell enclosing a flow path to enable in field cleaning of optical components and to enable re-configuration between open- and closed-path analyzer configurations.

Images are obtained from an imaging device. The images represent patterns projected in a time series by a projection device. Each pattern comprises dashed lines each of which has a predetermined width. A longitudinal direction of each dashed line is substantially perpendicular to a base line defined by a segment connecting optical centers of the projection and imaging devices. Each dashed line repeats light and dark in the longitudinal direction. The dashed lines are discriminated based on combinations of the light and dark in the images. Correspondences between projected coordinates and image coordinates of the dashed lines are detected based on information regarding the patterns and a discrimination result of the dashed lines. A three-dimensional shape of the object is calculated based on the correspondences, and calibration data of the projection and imaging devices.

A device and a method for non-contact recording of spatial coordinates of a surface includes a sensor head and a controller connected to the sensor head. The sensor head is designed as a portable hand-held device, a projector and two cameras. The controller is also designed as a portable device, with an electrochemical energy source housed in the controller or in the sensor head for power supply to the sensor head and the controller and no cable connection of the sensor head or the controller is provided to further stationary components of the device.

The invention discloses a quick test device for performances of a trough type solar thermal collector, which comprises a fuel tank, a valve arranged at the port of the fuel tank, a fuel pump, a thermal collector, a heat interchanger, a vapor tank, an expansion tank, a water pipe and a direct radiometer which is fixed with the thermal collector in the same direction, wherein the focusing point of the thermal collector is provided with a thermal collecting pipe; the fuel tank is filled with heat conducting fuel; the thermal collector, the heat interchanger and the expansion tank are connected bypipelines in sequence to form a loop; the thermal collecting pipe is connected on the left of the valve, and the expansion tank is connected on the right thereof; and the water pipe and the vapor tank are respectively connected at the inlet and the outlet of the heat interchanger. The quick test device has the advantages of simple and easily-implemented structure and capability of realizing quicktest of performances of the thermal collector. The invention also discloses a quick test method for the performances of the trough type solar thermal collector.