摘要:
Disclosed systems and techniques are directed to correct an out-of-plane deformation (OPD) of a substrate. The techniques include obtaining, using optical inspection data, an OPD profile of the substrate and obtaining a polynomial representation of the OPD profile to determine a plurality of polynomial coefficients characterizing respective elemental deformation shapes of the substrate. The techniques further include identifying one or more cylindric decompositions of a quadratic part of the OPD profile and computing, using a selected cylindric decomposition of the one or more cylindric decompositions, one or more characteristics of a stress-compensation layer (SCL) for the substrate. The techniques further include causing the SCL to be deposited on the substrate and the SCL to be exposed to a stress-mitigation beam.
摘要:
A method for evaluating a leadframe surface includes positioning a leadframe on a measurement apparatus at a first predetermined distance relative to an end portion of a light source of an optical sensor; irradiating a predetermined area on a surface of the leadframe with light having a single predetermined wavelength from the light source; receiving, with a light receiver of the optical sensor, reflected light from the predetermined area on the surface of the leadframe, and converting the reflected light into an electric signal; determining a reflection intensity value of the predetermined area on the surface of the leadframe based on the electric signal; and calculating a reflection ratio of the predetermined area on the surface of the leadframe based on the reflection intensity value and a predetermined reference reflection intensity value associated with the light source.
摘要:
A vacuum system and method for inspecting a workpiece that can include use the vacuum system, where the vacuum system can include a housing defining at least a portion of a vacuum chamber, a piston within the housing that oscillates to vary a volume of the vacuum chamber, a first valve and a second valve in fluid communication with the vacuum chamber, and a hood in fluid communication with the second valve and the vacuum chamber. The vacuum system can include high-speed valves that enable vacuum system cycling and thus vacuum pressure cycling at a rapid frequency.
摘要:
The present invention relates to a method of analyzing a laminated object and to a system for analyzing a laminated object. Illustrative embodiments herein relate to optical interferometry techniques for non-destructively analyzing laminated objects with large surface utilized to obtain data relating to the topography of an object under examination and to further process the obtained topographical data so as to identify type and/or severity and/or position of surface defects.
摘要:
An apparatus and a method capable of measuring large deformation with a high accuracy and dynamically, using speckle interference, utilizes an optical path where one laser beam out of two laser beams becomes non-collimated light and a plane parallel transparent plate, and can form carrier fringes. More specifically, the transparent plate is arranged on the optical path where the non-collimated light is formed, or is removed from the optical path, or a refractive index, or a thickness of the transparent plate arranged on the optical path, or a tilt angle relative to an optical axis is changed. The phase analysis can be performed from fringe images corresponding to the deformation, by performing repetitively the above-described processing and acquisition of the speckle interference pattern.
摘要:
The present invention relates to a portable industrial instrument for performing, in an integrated and two-way manner, an interferometric fringe projection and shearography, on a object to be tested, so that, when the two-way interferometer (1) is associated with the coherent or quasi-coherent projection device (2), the instrument is able to measure the 3D shape of the object by interferometric fringe projection, also known as moiré method, and, when the two-way interferometer (1) is associated with the recording or imaging device (4), the instrument is able to perform shearographic measurements on the object, the direction of the traversing light beam in the interferometer (1) being reversed when shifting from one measurement configuration to the other one.
摘要:
A system and method are presented for use in the object reconstruction. The system comprises an illuminating unit, and an imaging unit (see FIG. 1). The illuminating unit comprises a coherent light source and a generator of a random speckle pattern accommodated in the optical path of illuminating light propagating from the light source towards an object, thereby projecting onto the object a coherent random speckle pattern. The imaging unit is configured for detecting a light response of an illuminated region and generating image data. The image data is indicative of the object with the projected speckles pattern and thus indicative of a shift of the pattern in the image of the object relative to a reference image of said pattern. This enables real-time reconstruction of a three-dimensional map of the object.
摘要:
The invention serves for the contour measurement and/or deformation measurement of an object, particularly a tire or a structural component of a composite material. The object is irradiated with light, particularly structured light, that is emitted by a radiation source and consists, in particular, of coherent light or partially coherent light, especially laser light. The light reflected by the object is picked up by a camera with an imaging sensor. In order to improve the image quality, a first image is produced with a first adjustment of the camera and/or the radiation source which is adapted to a first image region (13). In addition, a second image is produced with a second adjustment of the camera and/or the radiation source which is adapted to a second image region (12). Both images are combined (FIG. 5).
摘要:
The device enables strains of at least one surface (1) of a sample (2) to be measured versus temperature. Strains in a direction perpendicular to a predetermined plane, for example the plane of the surface (1), are measured by composite images. Strains in said plane are measured by image correlation. The measurements by image correlation and by composite images use a common visible light detection camera (3). The sample (2) is arranged in an enclosure (6) transparent at least locally to visible light (L). At least one infrared emitter (9) enables an infrared light to be created in a spectral band for a large part not detected by the camera (3).
摘要:
Methods, systems, and articles of manufacture consistent with the present invention identify a flaw in a structure by comparing a first interference pattern resulting from a first wave signal and a second wave signal propagating through the structure to a second interference pattern resulting from the first wave signal and the second wave signal propagating through the structure. The second interference pattern is obtained after obtaining the first interference pattern. It is determined whether there is a flaw in the structure by determining whether the first interference pattern deviates from the second interference pattern by a predetermined variance.