106 results about "Test beam" patented technology

The invention relates to the technical field of optical element surface shape dynamic measurement scheme design, in particular to an element surface shape dynamic measurement system based on a metasurface. According to the scheme, polarized light emitted by a laser is split into reference light and test light, the test light passes through a quarter-wave plate twice to realize polarization orthogonalization, and the test light is combined with the reference light to form elliptically polarized light; synchronously capturing component intensities of left-handed / right-handed circular polarized light and orthogonal line polarized light by using a detector, and resolving a phase difference delta in real time by combining a Stokes parameter; environmental interference is eliminated based on a common-path design, a polarization beam-splitting element is omitted, and the architecture is simplified; accurate dynamic measurement of the surface shape of the measured piece is realized by deducting the inherent surface shape error of the system. The system provided by the invention has the advantages of strong anti-interference performance, high measurement efficiency, remarkable cost reduction and the like, and is suitable for precise optical manufacturing and on-line detection scenes.

The invention provides a method and a device for testing optical fiber coupling efficiency in space optical communication, and belongs to the field of space optical communication. Comprising a light source generation module used for generating a test light beam; the turbulence simulation module is used for simulating the influence of external field turbulence on light beam transmission; the phase difference correction module is used for correcting a low-order phase difference caused by system installation and adjustment or platform vibration and the like and compensating other phase differences caused by phase differences of optical devices; the optical fiber coupling module is used for coupling the spatial light to an optical fiber and determining optical power; and the control module is used for controlling the turbulence simulation module and the phase difference correction module and determining the optical fiber coupling efficiency according to the optical power of the test light beam. By means of the device, a quantitative relation model between the single influence factor and the optical fiber coupling efficiency can be determined with high precision.

The invention belongs to the technical field of structural health monitoring, and particularly relates to an uncertainty reduction method based on seismic interference mode recognition and global measurement. The method comprises the following steps of: erecting high-speed image recording equipment in front of a tested beam body by adopting a three-axis holder, acquiring a lateral deformation time sequence image when the tested beam body is subjected to transverse excitation, constructing a structure global displacement field based on the time sequence image, and realizing accurate conversion from pixel coordinates to engineering data; the method comprises the following steps: obtaining an impulse response function of a tested beam body based on an earthquake interference method, determining a time domain theoretical model of the earthquake interference method, and solving modal parameters of the time domain theoretical model of the earthquake interference method by using a least square method, thereby improving the accuracy of modal parameter identification, reducing the uncertainty in modal parameter identification, and improving the accuracy of modal parameter identification. The spatial resolution of structural modal identification is improved, and dense measurement of vibration modes is realized.

The present invention relates to an optical modulation system based on the interaction of two collinear light beams having different wavelengths passing through a cuvette containing a solution of Cs2SnI6, comprising a pumping laser emitter emitting a modulated pumping beam with a wavelength between 355 nm and 1550 nm and with a variable frequency; a test laser emitter emitting a continuous wave test beam at 633 nm and with a power limited to 10 mW; a beam splitter where the pumping and test beams are combined to strike on the cuvette; a pass filter that removes the signal from the pumping beam; a spatial analysis camera; a time / frequency analysis equipment with a photodetector, a commercial lock-in amplifier and an oscilloscope; and a signal generator.

This invention discloses a laser beam identification device and method for identifying whether a test beam is a first laser beam or a second laser beam, wherein the spectral widths of the first and second laser beams are different. The laser beam identification device includes a beam expander, an aperture, and a detector. The beam expander allows the output beam formed after the test beam passes through to be incident on a first and a second slit in the aperture. The output light from the first and second slits interferes. The detector is located on the light-emitting side of the aperture and is used to detect the light intensity at at least two positions, which are different positions along the direction of the interference fringes. Based on the light intensity at these at least two positions, the detector determines whether the light field distribution at these positions is a fringe distribution or a uniform field distribution, thereby determining whether the test beam is the first or the second laser beam. This invention has low cost, relatively small size, and low power consumption.

A method for improving OCT imaging accuracy. The present invention relates to the field of processing detection technology, and specifically to the field of a method for improving OCT imaging accuracy. The present invention introduces an electrically controlled crystal in the propagation direction of a reference beam, and controls the electrically controlled crystal by applying an external electric field to change its refractive index, thereby changing the light intensity of the reference beam, making its light intensity equal to the light intensity of a test beam reflected from the surface of the inspected material, thereby improving the OCT imaging accuracy. The method for improving OCT imaging accuracy comprises: a reference beam and a test beam; an electrically controlled crystal is provided in the propagation direction of the reference beam; the electrically controlled crystal is used to adjust the light intensity of the reference beam to obtain a reference beam with adjusted light intensity; the test beam is reflected from the surface of the inspected material to obtain a returned test beam; when the light intensity of the reference beam with adjusted light intensity is equal to the light intensity of the returned test beam, the OCT imaging accuracy is improved.

The invention discloses an array optical waveguide detection system and method, and the system comprises a light source which is used for transmitting a test light beam, transmitting the test light beam to a waveguide substrate, enabling the test light beam to enter an array optical waveguide through a first surface and then to be transmitted to an array spectroscope, the light is emitted to the second surface after passing through the array spectroscope; the detection assembly is used for receiving the test light beam emitted from the second surface so as to detect the parallelism of the array spectroscope; the incident angle of the test light beam emitted to the waveguide substrate is theta, theta = arcsin (n.sint), t meets: t is the refraction angle of the test light beam entering the waveguide substrate through the first surface, n is the refractive index of the waveguide substrate, and alpha is the included angle between the array spectroscope and the first surface. According to the array optical waveguide detection system, the measurement precision of the detection system can be improved.

The application discloses a kind of ultra-long curvature radius convex spherical surface shape measurement systems, the surface shape measurement system includes interferometer, spherical standard mirror, aberration compensation lens and the convex spherical mirror to be measured in same optical axis, the aberration compensation lens is concave on the side of the convex spherical mirror to be measured;Light beam emitted by interferometer, part is reflected back to interferometer by spherical standard mirror, forms reference beam, another part passes through spherical standard mirror, aberration compensation lens, is irradiated on the convex spherical mirror to be measured, is reflected twice by the convex spherical mirror to be measured, finally, it is back to interferometer by aberration compensation lens, spherical standard mirror, forms test beam;Reference beam and test beam interfere, form interference fringe, obtain the surface shape error of measured surface by analyzing interference fringe.The application solves the problem that the size of detection equipment is large, the cost is high and difficult to realize in prior art for detecting ultra-long curvature radius convex spherical mirror surface shape.

A method and an apparatus for calibrating an array path of a beam forming test equipment for a base station, includes enabling a beam forming-related interlocking test of a base station and a test equipment by compensating for distortion of the beam forming characteristics of the base station incidentally caused by the connection between the base station and the test equipment by using a specific signal transmitted from the base station, when test equipment such as a channel simulator is used to test beam forming of a base station.

The invention discloses a spectrum confocal displacement measuring device and method based on a random structure mask dispersion probe, and relates to the technical field of optical precision measurement, and the device comprises a broadband spectrum light source, an optical fiber, a random structure mask, a dispersion objective lens, a spectrometer and an upper computer; the wide-spectrum light source emits a wide-spectrum light beam, and the wide-spectrum light beam is transmitted to the random structure mask through the optical fiber; the random structure mask converts the wide-spectrum light beam into a multi-aperture emergent light beam; the dispersion objective lens performs axial dispersion on the multi-aperture emergent light beam to obtain a test light beam; the test light beam is reflected on the surface of the tested object to form reflected light; the dispersion objective lens is also used for collimating the reflected light; the spectrograph receives and processes the collimated reflected light to obtain a test spectrum curve; and the upper computer determines the displacement value of the measured object according to the test spectrum curve. According to the invention, the luminous flux injected into the optical fiber from the light source can be effectively improved, the spectrum peak value is better extracted, and the measurement precision is further improved.

A detection system includes: at least one light source that outputs a plurality of test beams input to a proximal end portion side of an optical fiber and having different wavelengths and providing different bending losses of the optical fiber; at least one reflector that reflects each of the test beams propagating through the optical fiber, on a distal end portion side of the optical fiber; a plurality of light receiving units that receive a plurality of reflected beams each being a beam reflected by the at least one reflector, on the proximal end portion side; and a determination unit that, based on information about the reflected beams at the plurality of light receiving units, compares the information about the reflected beams with reference set values.

The invention discloses an optical axis registration system and method for a large-scale optical system with limited installation and adjustment space. The system comprises a front optical machine system of which emergent light is parallel light and a rear optical machine system of which incident light is parallel light, the front optical machine system comprises a front optical machine system optical axis marking mirror, and the rear optical machine system comprises an electric control reflex mirror and a rear optical machine system optical axis marking mirror; an auxiliary optical calibration component is placed in a butt joint optical path of the front optical machine system and the rear optical machine system, and an autocollimator is further arranged, wherein the optical axis of a test light beam emitted by the autocollimator is perpendicular to the butt joint optical path of the front optical machine system and the rear optical machine system; the auxiliary light correction component comprises a first parallel plate, a first 45-degree reflector, a second 45-degree reflector and a second parallel plate. A first 45-degree reflecting mirror and a second 45-degree reflecting mirror which form an included angle of 90 degrees are arranged between the first parallel flat plate and the second parallel flat plate which are arranged in parallel. According to the invention, high-precision registration of the optical axes of two large-size and large-mass large optical systems can be realized under the condition that the installation and adjustment space is limited.

The present invention belongs to the technical field of mechanical property testing and discloses a test method for composite bending and shear loading of beam webs. S1: Calculate the width of the upper and lower edge reinforcement plates at any position in the length direction of the test beam, and design and manufacture the upper and lower edge reinforcement plates based on the calculated widths; S2: Fix the upper and lower edge reinforcement plates to the upper and lower edge plates of the test beam respectively; S3: Fix the first end of the test beam, the upper and lower edge reinforcement plates on the same side to the fixed end; S4: Calculate the load force required to be applied by the loading assembly at the second end of the test beam; S5: Apply the load force to the second end of the test beam through the loading assembly. In the present invention, the upper and lower edge reinforcement plates are used to ensure uniform loading of the beam web of the test beam, accurately simulate the actual force of the beam web, accurately test and verify the beam web, and ensure the stability of the test beam in actual use.

The present invention discloses a loading method suitable for static and dynamic load tests in old bridge sites. Before the static and dynamic load tests are carried out, a pedestal foundation and a reaction frame foundation are set at the test site to locate the test area, and then a track and a mobile pedestal are set to carry the test beam to the test area. After the beam is carried to the test area, a jack is installed using the reaction frame. The overall test site has fewer installation structures, fewer reaction frames, a high degree of prefabrication, and convenient transportation of small-volume components. The assembly process is simple and safe, the operation space is large, and repeated test operations are convenient. The mobile pedestal simultaneously has the functions of carrying the test beam and limiting and supporting the beam in static and dynamic load tests. The method has strong applicability and can meet the static and dynamic load test requirements of beams with various cross-sections such as T-shaped, I-shaped, and box-shaped by changing the positions of the mobile pedestal, the reaction frame, the jack, and the distribution beam.

This invention discloses a tilted wavefront sub-aperture stitching interferometric detection method based on a spatial light modulator, relating to the field of optical detection. Light emitted from a laser is collimated and expanded before being incident on a polarizing beam splitter; the reflected light serves as a reference beam, and the transmitted light as a test beam; the test beam is incident on a spatial light modulator, and after phase modulation by the spatial light modulator and passing through a lens, it forms standard spherical waves with different tilt angles, allowing for zero-position detection of sub-apertures divided into different regions. Using a spatial light modulator as an ideal point source array generator in conjunction with an imaging lens can generate the required ideal tilted spherical waves for different test parameters, offering strong versatility compared to traditional point source generators. Furthermore, for large-aperture complex curved surfaces, sub-aperture stitching can be achieved without moving the interferometric device, reducing errors introduced by mechanical movement.

The utility model discloses a testing device for an infrastructure high-performance anti-crack sealing layer, which comprises a testing beam, a reinforcing mesh is arranged in the testing beam, a testing groove is arranged in the middle of the upper end of the testing beam, an anti-crack sealing layer is arranged at the top end of the testing beam, and part of the anti-crack sealing layer covers the testing groove. A test groove is formed in the test beam, detection liquid is arranged in the test groove, a pressure applying device is arranged above the test beam, the test groove is positioned between two pressure points of the pressure applying device, and a support frame is arranged below the test beam. Compared with the prior art, the device has the advantages that downward pressure is applied to the test beam through the pressure applying device, when the test beam at the test groove is cracked, whether water seepage occurs or not is observed, if not, the performance of the anti-crack sealing layer reaches the standard, and otherwise, the anti-crack sealing layer fails. The whole structure is simple, and the real stress of cracking of the anti-crack sealing layer of the bridge floor can be simulated. Secondly, whether the crack-resistant seal coat is damaged or not is judged by observing whether the test beam has a water seepage phenomenon or not, the operation is simple, and the judgment is clear.

The application provides a kind of beam spot test method and device, the beam spot test method includes: the corresponding relationship curve between the gray scale of radiation color film and the radiation dose of accelerating tube is established;Radiation color film is placed on test table, the distance between radiation color film and the beam end of accelerating tube is adjusted to measurement distance;Accelerating tube is controlled to be in working condition, to output the preset dose of electron beam irradiation on radiation color film;Remove the color change after radiation color film and scan to obtain gray scale image;According to corresponding relationship curve and gray scale image, dose contour map is obtained;According to dose contour map, the beam spot size of electron beam at measurement distance is obtained.In the process of testing beam spot size, the distance between radiation color film and the beam end of accelerating tube can be adjusted, and then the shape of beam spot can be corrected to the preset shape, to improve the accuracy of beam spot size measurement.

The invention relates to an alignment device for aligning an optoelectronic sensor, comprising at least one transmitting channel for emitting a test light beam and at least one receiving channel for receiving a test light beam emitted by an associated transmitting channel. The at least one transmitting channel includes a light source for generating the test light beam. The at least one receiving channel includes a light receiver and a receiving optics arrangement for focusing the received test light beam onto the light receiver. In at least one receiving channel, a receiving filter is provided upstream of the light receiver, which has a transmission profile with a transmission gradient and is arranged such that the received test light beam passes through different sub-regions of the receiving filter depending on its angle of incidence into the receiving channel.The invention further relates to a corresponding alignment device with a transmitting filter, a method for aligning an optoelectronic sensor and an optoelectronic sensor with an alignment device according to the invention.

The invention relates to the technical field of optical precision measurement, and discloses an angle measurement method and device based on micro-wavelength-difference dual-wavelength interference, and the method comprises the following steps: employing a micro-wavelength-difference dual-wavelength extended light source, and generating equal-inclination interference fringes through a Michelson interferometer; a linear moving mechanism capable of adjusting the inclination direction is utilized to enable the plane mirror of the test light beam to move along the inclination direction; the inclination angle is indirectly measured through the fringe change characteristics of micro-wavelength difference dual-wavelength interference. The interference method and device for angle measurement are simple and easy to implement and convenient to install and debug; the method is suitable for high-precision measurement of tiny angles and angles near 180 degrees; fuzzy or clear interference fringes are used as judgment and positioning basis, response is sensitive, accuracy is good, and the method is also suitable for computer automatic analysis and processing; high-precision angle measurement is obtained through a low-precision linear displacement mechanism, and the second order-of-magnitude precision can be obtained.

The invention discloses an adjustable bending-torsion ratio loading device for a beam member and an installation and loading test method thereof. The device comprises two sets of clamping upper cross beams and clamping lower cross beams which are arranged symmetrically; the two sets of bent upper cross beams and bent lower cross beams are arranged in an anti-symmetric manner; a movable spherical hinge support is arranged on the upper surface of the bending and twisting upper cross beam, and the upper portion of the spherical hinge support is connected with an electro-hydraulic servo actuator; the bottom of the clamping lower cross beam is connected with an arc slide way support with a limiting function. According to the loading device and the loading method, the loading arm and the loading point of the electro-hydraulic servo actuator can be changed, a test beam composite action loading test with any different bending-torsion ratio parameters can be carried out, and the stability of the test device under the large-angle and large-deformation loading condition can be effectively realized by utilizing the spherical hinge support; the measuring device records an elastic-plastic load displacement curve in the whole process. The device is particularly suitable for bending and torsion test loading of thin-wall section steel box girders and steel-concrete combined box girders which are small in bending and torsion rigidity and large in torsion deformation.

This invention relates to the field of engineering life prediction technology, and particularly to a method and equipment for determining fatigue damage in corrugated steel web composite box girders. The invention acquires strain at local locations on the corrugated steel web using strain gauges, constructs strain response curves, determines the strain-transmitted damage characterization vector by comparing the vector directions of the crack propagation tendency characterization vector, and obtains several load output explicit cycle numbers by comparing and analyzing the strain response curves corresponding to local webs with each explicit tendency with a strain response reference curve. Finally, the maximum load-bearing cycle number of the test beam is determined and recorded. This invention implements the above steps by setting up a test bench, measurement module, feature analysis module, feature extraction module, and recording module. Furthermore, it achieves the correlation between the multi-directional geometric features of the corrugated steel web and the strain response differences in different damaged areas, accurately determining the maximum load-bearing cycle number and improving the accuracy of fatigue damage assessment.

The disclosure provides an electric-optical crystal light passing surface normal and crystal optical axis angle measuring device, comprising: a laser (1) for generating a test light beam; an optical shaping module for shaping and expanding the test light beam; a conic interference module for adjusting the polarization degree of the shaped and expanded test light beam, and adjusting the test light beam into a conic light beam acting on the measured electric-optical crystal; a sample posture adjusting assembly (8) for setting the measured electric-optical crystal, and adjusting the rotation angle of the measured electric-optical crystal in three-dimensional space; a collimation imaging module for focusing the test light beam emitted after passing through the measured electric-optical crystal; a first detection module (11) for receiving the test light beam emitted after passing through the measured electric-optical crystal to obtain the optical axis exposure point; and a measurement and calculation module for calculating the angle between the light passing surface normal of the measured electric-optical crystal and the crystal optical axis.

One method involves generating a source beam of heterodyne light directed at a test layer such that the source beam strikes the test layer at a first angle of incidence. The source beam is polarized, creating a reference beam. A portion of the source beam reflected by the test layer is also polarized, creating a test beam. Intensity signals of the reference beam and test beam are measured. A phase difference between the intensity signals of the test beam and the reference beam is determined. Based on this phase difference, the refractive index, extinction coefficient, and thickness of the test layer are calculated.

The present application relates to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method, in particular to a kind of polarization measurement error evaluation and decoupling system, evaluation method and decoupling method of polarization detection optical equipment, solve the problem that prior art lacks the evaluation method and decoupling method of coupled polarization measurement error introduced by instrument polarization and imaging quality of polarization detection optical equipment.The system includes test beam generation module, analysis unit and information acquisition computer;Test beam generation module includes laser light source, beam collimator, polarizer, beam splitter and the polarization distribution modulation element of light arranged on the reflected light path of beam splitter in order along optical path;Analysis unit is arranged on the output light path of the polarization detection optical equipment to be measured, for acquiring the detection signal outputted therefrom, and extract the required information therefrom, and transmit to information acquisition computer;Information acquisition computer is used to calculate polarization measurement error and decouple coupled polarization measurement error.

The invention discloses a testing device and a testing method of the testing device, and belongs to the technical field of light beam quality testing. The testing device is used for testing a target light beam quality analyzer, the testing device comprises a mounting platform, a laser, a light splitting element and a reference light beam quality analyzer, and the laser is rotatably arranged on the mounting platform; the light splitting element is used for splitting output light of the laser into a first test light beam and a second test light beam, so that the target light beam quality analyzer receives the first test light beam and forms a first test light spot; the reference light beam quality analyzer is used for receiving the second test light beam and forming a second test light spot; wherein the rotation axis of the laser is parallel to the output light, and the test light spot and the reference light spot are both elliptical. Time and labor are saved, the testing efficiency and the testing flexibility can be improved, the testing cost is reduced as much as possible, and the testing process is simplified.

The utility model discloses a friction loss testing device based on an electromagnetic elastic type absolute stress sensor, which comprises a prestressed steel beam, a prestressed test beam, an electromagnetic elastic type absolute stress sensor and a magnetoelastic cable force demodulation device, the electromagnetic elastic type absolute stress sensors are fixedly arranged outside the prestressed pipeline, at least one set of electromagnetic elastic type absolute stress sensors are arranged at the first end of the prestressed pipeline, at the second end of the prestressed pipeline and between the two ends of the prestressed pipeline, and the multiple sets of electromagnetic elastic type absolute stress sensors are used for conducting multi-point-position prestress detection on the prestressed steel beam. The comprehensiveness and the fineness of prestress data acquisition can be improved; the electromagnetic elastic type absolute stress sensor is fixed outside the prestressed pipeline and is not in contact with the steel beam, when the prestressed steel beam is tensioned or grouted, the electromagnetic elastic type absolute stress sensor cannot be additionally pressed and damaged, meanwhile, a grouting material and a beam body pouring material cannot affect the sensor, and the detection precision can be ensured.

This invention belongs to the field of photodetector technology, specifically disclosing an automatic testing system and method for a four-quadrant APD component. The system includes: a temperature-controlled chamber providing a controllable temperature testing environment; an optical unit generating a stable test beam with adjustable intensity; a fixing fixture installed inside the temperature-controlled chamber, where the device under test (DUT) is installed during testing, and the fixture can be adjusted to switch between different quadrants, allowing the light source to switch between different photosensitive surfaces of the DUT; and a measurement and control unit including a bias power supply, an oscilloscope, a picoammeter, a temperature control and acquisition module, and a host computer. This system, by integrating a temperature control unit, a precision mechanical alignment structure, multi-parameter measurement hardware, and host computer control software, achieves automated, high-precision, multi-parameter testing of APD four-quadrant components across the entire temperature range, significantly improving testing efficiency and reliability.

The invention relates to a secondary image deviation test system for glass, comprising: a glass fixer suitable for fixing glass to be tested; the target type light source instrument is arranged on the first side of the glass and irradiates the glass with a test light beam; the visual acquisition module is arranged on a second side, opposite to the first side, of the glass, is oriented towards the target type light source instrument and acquires an image irradiated on the glass by the test light beam; the adjusting bracket assembly is suitable for supporting the visual acquisition module and driving the visual acquisition module to move; and the analysis processing module is connected with the visual acquisition module and is used for analyzing and processing the image acquired by the visual acquisition module so as to obtain a secondary image deviation value at the corresponding test position. The invention further relates to a corresponding auxiliary image deviation testing method. According to the invention, the test efficiency can be improved without moving the glass, the sub-image deviation value is accurately read, and the test cost is reduced.

The utility model relates to the technical field of reinforced concrete beam torsion test supports, in particular to a reinforced concrete beam torsion test support which comprises two underframe assemblies, the upper ends of the underframe assemblies are detachably connected with a bearing plate, the upper end of the bearing plate is provided with a ball assembly, the upper end of the ball assembly abuts against a steel plate piece, and the upper end of the steel plate piece abuts against a steel plate. A torsion support abuts against the upper end of the steel plate piece, a clamping mechanism is installed at the upper end of the torsion support, and a rolling shaft is arranged in the clamping mechanism. The vertical load is converted into the torque through a more economical and reasonable method, the size design needs to meet the requirement that the circle center of a rotating arc coincides with the centroid of the beam section, it is guaranteed that the test beam is in a pure torsion state all the time in the loading process, meanwhile, the test piece can freely stretch out and draw back in the long-axis direction, and the test efficiency is improved. The test device can be adjusted according to the size of the beam, is more flexible and portable, and can be installed manually.

The invention provides a marine detachable material crane test device which comprises at least six flange bottom plates arranged in an array at equal intervals, each flange bottom plate is provided with a stand column, flange cross beams are arranged between the stand columns which are transversely arranged, the lower portions of the flange cross beams are provided with flange transition bases, and the flange transition bases are connected with the stand columns. A connecting line between bottom center points of the flange transition bases has a first angle relative to the horizontal plane, a test beam is arranged below the flange transition bases, the test beam has a second angle relative to the horizontal plane, the first angle is equal to the second angle, a translation material crane is arranged at the lower part of the test beam, and the translation material crane is connected with the test beam. The translation material hanger has a third angle relative to the horizontal plane, and the third angle is equal to the second angle, so that the technical effects of convenience in installation and diversified test angles are realized.