104 results about "Scanning plane" patented technology

The invention discloses a mechanical arm automatic ultrasonic scanning method based on binocular vision and a related product. The method comprises the steps that first three-dimensional information of a first object in a first coordinate system is obtained, the first three-dimensional information is determined on the basis of a binocular image comprising the first object, the first object comprises a first point, and the first coordinate system is a coordinate system constructed on the basis of a base of the mechanical arm. A first normal vector of the first point is determined based on the first three-dimensional information. Determining a first pose under the first coordinate system based on the first normal vector; the first pose is a pose when the ultrasonic probe emits ultrasonic waves and generates an ultrasonic image based on a reflected signal of the ultrasonic waves, and an ultrasonic scanning surface of the ultrasonic waves passes through the first point. Wherein under the condition that the pose of the ultrasonic probe is the first pose, the included angle between the ultrasonic scanning surface and the first normal vector is smaller than or equal to a first threshold value. The invention further discloses a corresponding product. Through the method provided by the invention, the efficiency of determining the pose of the ultrasonic probe can be improved.

A respiratory motion plane alignment system and method based on ultrasound images is disclosed. The system acquires three-dimensional ultrasound images of respiratory organs at at least two different respiratory phases, calculates the motion direction of the respiratory organs based on the three-dimensional ultrasound images, controls and adjusts an ultrasound direction adjustment mechanism to align the scanning plane of the ultrasound probe with the motion direction of the respiratory organs, acquires a three-dimensional model image of the respiratory organs and multiple frames of real-time two-dimensional ultrasound images, performs registration between the multiple frames of real-time two-dimensional ultrasound images of the respiratory organs, and / or registers the three-dimensional model image and the multiple frames of real-time two-dimensional ultrasound images, acquires three-dimensional position data of a target point during respiratory motion, determines the tracking path of the ultrasound probe based on the three-dimensional position data of the target point during respiratory motion, and controls the ultrasound probe to move along the tracking path, thereby achieving long-term stable observation or tracking of target points in the respiratory organs.

The invention discloses a fast iteration deconvolution sound source imaging method and system, and the method comprises the steps: obtaining an audio signal and a video signal generated in a partial discharge process, and extracting the frequency domain information of the audio signal to construct a cross spectrum matrix; a propagation path of sound waves in a scanning plane area is simulated, a steering vector is generated, and the scanning plane area is key parameters initialized according to sound source positioning requirements; modeling the sound field response characteristic of each point in the scanning plane area to generate a point spread function; optimizing and solving the point spread function by adopting a fast iterative shrinkage threshold algorithm to obtain an optimal sound source distribution diagram, wherein a step length factor and an intermediate variable are updated based on the steering vector and a residual vector constructed by the cross spectrum matrix in an iteration process; according to the invention, high-quality sound field distribution data can be rapidly and accurately obtained.

The invention provides a method for measuring energy flux density three-dimensional space distribution of a solar concentrator, and belongs to the technical field of solar photo-thermal power generation. Comprising the steps that an energy flux density sensor array of a main-auxiliary column structure is constructed, main columns are symmetrically arranged with the focus of a condenser as the center, and auxiliary column sensors are located at the centers of adjacent sensors of the main columns; the array is driven by a double-shaft guide rail system to perform multi-plane scanning, and CCD images and energy flux density data are synchronously acquired; establishing a mapping relation between the energy flux density data and the space coordinates based on the optical reference points; in-plane data are processed by adopting a thin-plate spline interpolation method, and three-dimensional energy flux density field reconstruction is realized by combining a trilinear interpolation method. The normalized peak energy flux density gradient between adjacent scanning planes is controlled within 40%. According to the invention, data are directly obtained through the energy flow sensor, CCD gray scale conversion errors are avoided, and the energy flow density three-dimensional space distribution characteristics from a focal plane to a discrete region can be completely represented by adopting the dynamically adjustable scanning plane spacing.

The invention relates to a brain glioma grading method based on multi-instance causal characterization learning, and the method comprises the following steps: S1, data preprocessing, S2, feature extraction through ResNet-50, S3, feature coding of high-dimensional feature representations of instances, S4, decoupling of low-dimensional feature representations of each instance, obtaining causal features and non-causal features, and carrying out classification on the causal features and the non-causal features. S5, constructing an adaptive adjacency matrix A, constructing a sparse adjacency matrix A (k) by adopting a Topk neighbor selection strategy, and carrying out information aggregation through a graph neural network to obtain aggregation features; S6, carrying out local feature aggregation on each scanning plane p, calculating a weight weighted p of each scanning plane by utilizing a full-connection network, and carrying out weighted fusion to obtain an aggregation feature; s7, fusing and grading the aggregated features and the features; the method has the advantage of improving the stability and clinical applicability of the grading model.

The invention discloses a phase-free antenna measurement method, a phase-free antenna measurement system and a storage medium. The phase-free antenna measurement method comprises the following steps: constructing a measurement system comprising an antenna to be measured, a measurement probe, a fixed auxiliary reference antenna and software defined radio; the probe is controlled to move and sample on the scanning plane, and the SDR synchronously collects receiving signals of the probe and the reference antenna; based on the frequency domain transformation result of the two paths of signals, the radiation field amplitude of each sampling point and the relative phase relative to the reference antenna are directly calculated through non-iterative operation, so that complete complex electric field distribution on the scanning plane is reconstructed; and finally, obtaining a far-field directional diagram through near-field-far-field transformation. The fixed reference antenna is introduced to serve as a phase reference, synchronous acquisition and direct calculation are achieved in combination with the SDR, the antenna radiation field can be rapidly and accurately recovered without direct phase measurement or complex iteration in the single scanning plane and single scanning process, and the method has the advantages of being simple in system, high in measurement efficiency and high in signal drift resistance.

The invention relates to a stable foundation flatness laser measuring instrument and a method thereof, and belongs to the field of engineering measurement and foundation detection.The method comprises the steps that S1, a disturbance isolation base, a self-stabilizing suspension measuring head and a sensing assembly are arranged; s2, starting an air source connected to the disturbance isolation base, and attenuating and limiting the physical shake of the self-stabilizing suspension measuring head within a low-frequency range; s3, starting work of the sensing assembly, rotating the laser scanner to obtain original polar coordinate data of the surface of the foundation, and capturing attitude data of the self-stabilizing suspension measuring head by the high-frequency inertial measurement unit; and S4, stopping acquisition, constructing an absolute coordinate system taking a gravity vector as an axis based on attitude data, calculating an instantaneous deflection relationship of a scanning plane of the rotary laser scanner, performing elevation reduction on original polar coordinate data, and fitting a least square plane to evaluate the flatness of the foundation. According to the invention, an original observation platform with extremely high stability is provided for the laser scanner and the inertial measurement unit, and the signal-to-noise ratio of measured data is ensured from the physical level.

Disclosed are a prostate puncture guidance method, apparatus, device and system based on multi-modal fusion. The prostate model of the object to be examined and the ultrasonic probe model with at least one scanning plane are displayed in the same display area. Based on the real-time coordinate and ultrasound image information collected by the ultrasonic probe, the display area dynamically displays dynamic updates. Users may get the positional relationship between at least one scanning plane and the target identifier in the prostate model. This allows for quickly and accurately understanding the intersection between the scanning plane corresponding to the puncture plate installed on the ultrasonic probe and the target identifier. Additionally, through another display area showing the correlation between the specific puncture hole in the puncture plate and the target identifier, sampling can be quickly completed through the sampling device by penetrating the specific puncture hole.

This application discloses a planar scanning-based immersion battery thermal runaway identification device and method, relating to the field of battery energy storage safety monitoring technology. The device consists of a fully enclosed immersion tank, immersion liquid, ultrasonic phased array sensors located at the corners of the inner wall of the tank, and a signal processing module. The sensors are installed below the liquid surface and above the individual battery cells, emitting fan-shaped ultrasonic beams to form a horizontal logical scanning plane covering the entire diagonal length of the bottom surface of the module. This identification method employs active scanning and physical feature extraction logic: first, an environmental acoustic impedance reference spectrum is established using phased array beams; then, echo changes within the scanning plane are monitored in real time. This invention effectively eliminates the interference of battery bulging and mechanical vibration on traditional monitoring methods, achieving refined characterization and centimeter-level precise positioning of the gas-generating physical characteristics during the thermal runaway evolution process, significantly improving the intelligent safety level of immersion energy storage systems.

The invention discloses a cerebral cortex penetrator small blood vessel magnetic resonance imaging method based on an inflow enhancement effect. The method comprises the following steps: modeling a penetrator small blood vessel to generate a blood vessel TOF (Time of Flight) image; calculating the blood vessel-grey matter contrast ratio of the blood vessel TOF image under different FAs and different TRs, and optimizing the FAs and the TRs according to the blood vessel-tissue contrast ratio; obtaining a structural image of the in-vivo brain tissue, performing cortex reconstruction, and calculating an angle of a surface normal of each cortex vertex relative to the B0 field to obtain a cortex angle graph; adjusting a single-layer blood vessel scanning plane angle according to the cortex angle diagram; and according to the optimized FA and TR and the single-layer blood vessel scanning plane angle determined in the step S4, carrying out magnetic resonance imaging on the cerebral cortex perforation small blood vessel. The invention further discloses a cerebral cortex puncturing small blood vessel magnetic resonance imaging device based on the inflow enhancement effect. According to the method and the device, magnetic resonance imaging of the cerebral cortex perforation small blood vessel can be realized under the non-invasive and contrast-agent-free conditions.

The invention discloses an absolute method broadband microphone calibration device, which comprises a broadband sound source, a translation rotating table, a laser vibration measurement system and a measurement and control system, and is characterized in that the broadband sound source generates a broadband pulse sound signal to form a broadband pulse sound field, and the translation rotating table drives the broadband sound source to perform translation and rotation motion to form a broadband pulse sound field; the laser vibration measurement system measures the vibration velocity of an air mass point in the pulse sound field, scanning of the pulse sound field is achieved through translation and rotation of the broadband sound source, the calibrated broadband microphone is installed in the pulse sound field, and the sound center position of the calibrated broadband microphone coincides with the center point position of a scanning plane; and the measurement and control system controls the laser vibration measurement system to scan the broadband pulse sound field, collects the output of the laser vibration measurement system, reconstructs the pulse sound field, and realizes absolute method calibration of the calibrated broadband microphone. According to the method, the boundary dimension, the number and the reciprocity of the microphone to be calibrated are not required, segmented calibration is not required, and absolute method calibration of the broadband microphone at 20-100 kHz can be realized.

The invention relates to the technical field of reconstructed image anomaly detection, in particular to an image data anomaly point detection and correction method and system based on magnetic resonance fingerprints, and the method comprises the steps: generating a simulation data dictionary containing random anomaly points based on a magnetic resonance scanning plane; obtaining a to-be-detected reconstructed image, extracting a reconstructed image signal evolution curve, and matching the reconstructed image signal evolution curve with the simulation data dictionary to obtain an abnormal point position in the to-be-detected reconstructed image; and correcting the image data according to the positions of the abnormal points in the to-be-detected reconstructed image to obtain a corrected image. According to the method, the scanned and acquired data is matched with the pre-generated data dictionary containing the random abnormal points, so that whether the abnormal points are contained or not can be detected, the abnormal points are corrected, related image artifacts are eliminated, reconstructed image anomaly detection can be realized without an AI model, manpower and material resources are saved, the stability is better, and the detection efficiency is improved. Deployment and implementation can be carried out in magnetic resonance imaging equipment.

An ultraviolet disinfection device is characterized in that the ultraviolet disinfection device comprises a disinfection space, a driving mechanism and a disinfection lamp panel, and the disinfection lamp panel is arranged in the disinfection space and connected with the driving mechanism; the disinfection lamp panel can be driven by the driving mechanism to rotate in a square-like scanning plane S1 of the disinfection space so as to carry out global disinfection on objects in the disinfection space. The disinfection lamp panel comprises a reuleaux triangle plate-shaped plate body and a strip-shaped ultraviolet lamp, and the reuleaux triangle plate-shaped plate body of the disinfection lamp panel can rotate in the square-like scanning plane S1 under the driving of the driving mechanism, so that the strip-shaped ultraviolet lamp can be used for globally disinfecting objects in the disinfection space; therefore, the problem that the light emitting angle of the optical chip is small can be solved, full-range disinfection is achieved, and no disinfection dead angle is left. The ultraviolet disinfection device disclosed by the utility model has the characteristics of novel structure and practical function, has strong practicability, and is suitable for being vigorously popularized.

The invention provides a complex curved surface carbon fiber material ultrasonic detection method and system based on a mechanical arm, and belongs to the field of nondestructive testing. The method comprises the steps of obtaining file data containing a complex curved surface, obtaining all triangular patch data of the complex curved surface through analysis, and constructing a model database; establishing a triangular patch association table according to a relationship among triangular patches in the model database, and extracting a feature curved surface; according to preset scanning precision, point location random selection is carried out on triangular patches in the feature curved surface, and scanning point cloud is generated; a scanning plane is determined through a simulated annealing algorithm, and the scanning point clouds are clustered and sorted; according to the clustered and sorted point clouds, an optimal scanning path is planned in combination with the energy consumption cost of the mechanical arm; and calculating the bottom surface thickness corresponding to each point in the scanning point cloud based on the scanning path, determining an echo generation position, and further determining damage information in the carbon fiber material. The damage detection of the internal defects of the complex curved surface carbon fiber material is realized.

The application discloses a scanning plane determination method and device, equipment and a storage medium, and belongs to the technical field of medical treatment. The determination equipment can predict distance information of multiple positioning images, the distance information of the positioning image is used to reflect the distance between each pixel in the positioning image and the first intersection line of the positioning image, and the first intersection line of the positioning image is the intersection line of the positioning image and the target scanning plane to be determined. Then, the determination equipment can automatically determine the target scanning plane based on the distance information of the multiple positioning images. Since the target scanning plane is automatically determined, manual determination of the target scanning plane according to experience is not needed, thereby on the one hand, the operation of the staff is reduced, the determination efficiency of the scanning plane is effectively improved, and on the other hand, the problem that the accuracy of the determined target scanning plane is low due to manual errors can be avoided, so that the accuracy of the scanning image based on the scanning plane can be ensured.

The invention relates to a method and a system for providing parameter data for a control scan of a computed tomography scanner assembly, the method comprising: receiving object path data comprising at least geometric information about a planned motion path of an object; receiving predefined control scan data comprising at least information about the position and orientation of at least one scan plane of at least one planned control scan for controlling the motion path of the object; receiving an evaluation model configured to provide parameter data for performing at least one control scan in accordance with at least the received object path data and the received control scan data; an evaluation model is applied and parameter data for performing the at least one control scan is provided, at least the object path data and the predefined control scan data being input data to the evaluation model.

The invention discloses a phase-free electromagnetic source inversion positioning method and device based on adaptive sparse sampling, and the method comprises the steps: determining the position of an adaptive sparse sampling point for a to-be-measured electromagnetic source on a near-field scanning plane, so as to obtain the near-field distribution data of the corresponding sparse sampling point; recovering the near-field distribution data into uniform distribution data through an interpolation method, and extracting amplitude information to obtain phase-free data; establishing a forward radiation model of the equivalent electromagnetic source according to the electromagnetic field integral equation model and the mirror image effect, and constructing a corresponding error minimization objective function based on the phase-free data and the forward radiation model; performing iterative optimization on the phase-error-free minimization objective function by using an LM algorithm so as to perform inversion on the electromagnetic source to be measured to obtain equivalent magnetic current source distribution; and reconstructing a magnetic field according to equivalent magnetic current source distribution obtained by electromagnetic source inversion. According to the scheme, efficient reconstruction of the near-field radiation characteristics of the radio frequency circuit can be realized while the number of sampling points is reduced and the inversion precision is ensured.

The invention relates to the technical field of sound insulation testing, in particular to a method and device for testing sound insulation of an automobile part based on wave velocity forming scanning and a vehicle, and the method comprises the steps: collecting noise information based on a sound collection array; selecting a scanning plane at a sound source and constructing a grid so as to restore noise hotspot information of the noise information to the scanning plane through beam forming analysis, and superposing the original geometric figure to obtain a wave velocity forming array; and determining the distribution information of the noise source of the to-be-detected automobile part according to the wave velocity forming array. Therefore, the problems that in the related technology, due to the fact that a sound intensity probe is used for testing points of a test piece every 10 cm, the test period is long, the position and angle deviation of the probe is prone to being caused by hand-held mobile testing, errors are large, the sound insulation index tested through a sound intensity method and the sound insulation index tested through a reverberation sound insulation method have test errors and need to be corrected, and the testing cost is high are solved. And the test efficiency and precision are not enough.

A contact acoustic microscope (1) is disclosed that comprises a scanning head (20) with a tip (21), a scanning actuator (31), a tip actuator (4), a high frequency signal source (5), a transducer (6, 6a) coupled thereto, an acoustic sensor (6, 6b), a signal processor (10) and an actuator controller (11). The scanning actuator (31) laterally displaces the scanning head (20) relative to a sample (S) along a scanning path (P) in a scanning plane (x,y). The tip actuator (4) oscillates the tip in a direction (z) transverse to the scanning plane to therewith provide for a time-dependent tip-sample contact surface (A(t)). The high frequency signal source (5) and the transducer (6, 6a) coupled thereto generate an acoustic signal that is provided through the tip of the probe to the sample. The acoustic sensor (6, 6b) provides a sense signal (Ssns) indicative for an acoustic signal received from the sample via the tip, which is processed by the signal processor (10) to render subsurface information about the sample. The actuator controller (11) controls the scanning actuator (3) and the tip actuator (4). The motion compensator compensates a lateral movement of the scanning head to minimize a displacement of the tip (2) relative to the sample (S) while the tip (21) is in contact with the sample (S).

An optoelectronic sensor comprises a light transmitter for emitting a transmitting light beam, a light receiver for receiving received light, and a scanning device that defines a transmitting light path and a receiving light path.The scanning device comprises a first mirror, designed as a first rotating mirror, arranged in the transmitting light path and driven to rotate about an axis of rotation in order to periodically deflect the transmitted light beam within a first scanning plane; a second mirror, designed as a second rotating mirror, arranged in the receiving light path and driven to rotate about the axis of rotation synchronously with the first rotating mirror; and a third mirror arranged in the transmitting light path, designed as a tilting mirror and driven to tilt about a tilting axis oriented transversely to the axis of rotation in order to deflect the transmitted light beam within a second scanning plane extending transversely to the first scanning plane.

Various systems and methods are provided for displaying a visual indicator that indicates a movement direction of an ultrasound probe relative to an ultrasound image. Ultrasound data corresponding to a scan plane of the ultrasound probe may be received. The ultrasound image corresponding to the scan plane of the ultrasound probe may be generated using the ultrasound data. The ultrasound image corresponding to the scan plane of the ultrasound probe may be displayed. A representation of the ultrasound probe that is oriented relative to the scan plane corresponding to the ultrasound image may be displayed. A movement direction of the ultrasound probe relative to the ultrasound image may be determined. The visual indicator indicating that movement direction of the ultrasound probe relative to the ultrasound image may be displayed.

The application discloses a security check image acquisition method and device, a security check system and a storage medium, relates to the field of active millimeter wave human body security check technology, and can acquire high-quality millimeter wave human body security check images in real time. The method comprises the following steps: constructing target space distribution information of a target object surface contour according to distance information of a plurality of reflection points obtained by detecting the target object by using a ranging sensor; wherein the plurality of reflection points comprise points on the target object surface; determining a target amplitude value of a target position point in the target space distribution information according to echo signals obtained by detecting the target object by using a millimeter wave scanning array; the target position point is a point in a two-dimensional plane parallel to a scanning plane of the millimeter wave scanning array; the target amplitude value is used for representing scattering intensity of the target position point to electromagnetic waves emitted by the millimeter wave scanning array; and determining a two-dimensional image of the target object according to the target space distribution information and the target amplitude value.

The invention provides a touch control method, device and system based on a display screen and a storage medium, and belongs to the technical field of display device.The method comprises the steps that a first laser signal is emitted to a touch control scanning plane corresponding to the display screen, and a second laser signal sent by a scanning system is received, the first laser signal is a laser signal emitted by a laser radar, and the second laser signal is a reflection signal of the first laser signal; in response to a touch notification sent by the stylus, calculating touch position information based on the first laser signal and the second laser signal, the touch notification being sent when the stylus detects that the touch pressure value is greater than a preset pressure value; and sending the touch position information to the display screen, so that the display screen responds to the touch operation based on the touch position information. By means of the scheme, it is guaranteed that the touch position information is obtained through calculation only when the touch pen makes actual contact with the display screen, mistaken touch caused by the large scanning range is prevented, and the touch accuracy is improved.

The invention belongs to the technical field of road traffic management, and particularly relates to a moving vehicle height real-time detection method based on a two-dimensional laser radar, and the method comprises the following steps: S1, data collection: obtaining point cloud data through the scanning of the two-dimensional laser radar, two-dimensional laser radar equipment is installed at a preset height position, the scanning plane of the two-dimensional laser radar equipment is made to be perpendicular to the ground, a data receiving module is arranged to receive point cloud data sent by a laser radar through a UDP protocol and analyze the point cloud data, and each data packet comprises polar coordinate information of a plurality of distance measuring points; s2, data preprocessing: converting the point cloud data from a polar coordinate system to a rectangular coordinate system through a point cloud processing module; according to the method, high-precision vehicle height detection can be realized only by adopting the single-line two-dimensional laser radar, the equipment cost is remarkably reduced, the height measurement precision of the method is equivalent to that of expensive equipment in an actual detection scene, and the actual application requirement is met.

An optoelectronic sensor comprises at least one light transmitter for transmitting a transmission light beam, a light receiver for receiving reception light and a scanning device that defines a transmission light path and a reception light path. The scanning device comprises a first mirror that is designed as a first rotating mirror, that is arranged in the transmission light path and that can be driven in a rotating manner about an axis of rotation in order to periodically deflect the transmission light beam within a first scanning plane; a second mirror that is designed as a second rotating mirror, that is arranged in the reception light path and that can be driven in a rotating manner about the axis of rotation synchronously to the first rotating mirror; and a third mirror that is arranged in the transmission light path, that is designed as a tilting mirror and that can be driven in a tilting manner about a tilting axis oriented transversely to the axis of rotation in order to deflect the transmission light beam within a second scanning plane extending transversely to the first scanning plane.

This utility model discloses a positioning device for a non-destructive testing system, belonging to the field of workpiece non-destructive testing technology, addressing the problems of high difficulty and poor accuracy in mechanical calibration of workpiece non-destructive testing systems. The positioning device of this utility model includes a first laser lamp, the beam plane of which coincides with the scanning plane of the scanning rotating body; a first positioning target; the first laser lamp is used to position the positioning plane on the first positioning target; the two ends of the first positioning target can be respectively connected to the ends of a main conveyor platform and an auxiliary conveyor platform, so that the workpiece transmission direction of the main conveyor platform and the auxiliary conveyor platform is perpendicular to the positioning plane of the first positioning target, and there is a gap between the main conveyor platform and the auxiliary conveyor platform and the scanning plane. This positioning device improves the accuracy and reliability of scanning and testing results.

The present disclosure relates to an ultrasonic diagnostic system and an operation assisting method. A current cross section search section (38) sets a temporary cross section group with respect to a tissue model corresponding to a subject tissue, calculates a similarity between each temporary cross section data and tomographic image data, thereby determining a current cross section corresponding to a scanning plane. An operation assisting information generation section (44) generates operation assisting information based on difference information indicating a spatial relationship between the current cross section and a target cross section (a cross section corresponding to an observation cross section). Based on a camera image, the temporary cross section group set with respect to the tissue model is screened.

Accuracy of ultrasound volume data generated by arranging multiple single-image data is improved. A single-image data sequence containing multiple single-image data corresponding to each scanning plane is acquired while an operator moves an ultrasound probe in a swiveling direction. A probe position and orientation information acquisition unit acquires position and orientation information specifying the position and orientation of the ultrasound probe when each of the frame data is acquired for generating ultrasound volume data, and assigns the position and orientation information to each frame data. A volume data generation unit generates the ultrasound volume data by modifying at least one of the perpendicular plane position (a position in a plane perpendicular to an arrangement direction of the frame data in a data space) and one orientation of the respective frame data in accordance with the position and orientation information associated with a corresponding frame data specification, and then arranging the frame data in the arrangement direction.

The present invention provides a foreign object inspection device that can accurately determine whether a foreign object is attached to the front or back surface of a material. [Solution] The device comprises a laser light irradiation unit that irradiates a light-transmitting film by scanning a laser beam linearly from one side of the film; a scattered light detection unit that detects a first scattered light intensity, which is the intensity of scattered light generated from foreign matter adhering to the film due to the P-polarization component of the laser light, and a second scattered light intensity, which is the intensity of scattered light generated from foreign matter adhering to the film due to the S-polarization component of the laser light; and a determination unit that determines whether the foreign matter adhering to the film is attached to one side or the other side, based on the first and second scattered light intensities detected by the scattered light detection unit. The device is configured such that, when the intersection of a scanning plane, which is the same plane as the region through which the scanned laser light passes, and an incident plane, which is a plane perpendicular to the scanning line of the laser light on the film, is taken as a reference line, the scattered light detection unit is positioned on a plane that intersects the incident plane with the reference line at an angle of 40 degrees or more and 50 degrees or less.

The invention relates to a measuring assembly (46) comprising a deflection unit (16) for directing a machining laser beam (14) onto a surface to be machined, in particular a machining head (18) of a laser machining device (10), and a measuring optical unit (34), which is arranged upstream of the deflection unit (16) in a beam propagation direction (52), for coupling a measuring beam (36, 36a, 36b) into the deflection unit (16); wherein the measuring optical unit (34) has a measuring scanner (50) for deflecting the measuring beam (36, 36a, 36b) in a scanning plane (64, 66) in at least one scanning direction transversely to the beam propagation direction (52) of the measuring beam (36, 36a, 36b); wherein the measuring optical unit (34) has a lens group (86), which is arranged downstream of the measuring scanner (50) in the beam propagation direction (52), for determining an imaging position (70) of the scanning plane (64, 66) in the beam propagation direction (52) at or downstream of an input aperture (40) of the deflection unit (16), wherein the lens group (86) has an entry lens (88) or has an entry lens subgroup with positive refractive power for refracting the measuring beam (36) entering the lens group (86) and an exit lens (90) or an exit lens subgroup with positive refractive power for refracting the measuring beam (36, 36a, 36b) exiting the lens group. The invention further relates to a laser machining device (10).