Abstract:
A scanning measurement system (100) includes independently driven, self- aligning, dual-sided heads. The system is configured to perform a method that includes receiving (406) information associated with a discrepancy in a desired cross direction alignment of a first sensor head (210a, 210b) and a second sensor head (210b, 210a) that are disposed on opposite sides of a web of material (102) and that are configured to move in a cross direction relative to the web. The method also includes adjusting (408) a velocity of at least one of the sensor heads based on the received information to improve the cross direction alignment of the first sensor head and the second sensor head.
Abstract:
Non-contacting caliper measurements of free standing sheets such as porous polymer and paper detect mid-IR interferometric fringes created by the reflection of light from the top and bottom surfaces of the sheet. The technique includes directing a laser beam at a selected angle of incidence onto a single spot on the exposed outer surface wherein the laser beam comprises radiation having a wavelength in the 3-50 micron range and scanning the laser beam through a selected angle range as the laser beam is directed onto the exposed outer surface and measuring the intensity of an interference pattern that forms from the superposition of radiation that is reflected from the exposed outer surface and from the inner surface. Thickness can be extracted from the fringe separation in the interference pattern. Rotating and focusing elements ensure that the spot position on the sheet remains the same while varying the incident angle.
Abstract:
Upper to lower assembly analog position sensors in a dual scanning system measure alignment offsets. A controller uses error signals from the position sensors to calculate actuator error profiles that are used in the next scan in the same direction, with different error profiles being used for forward and reverse scans. Since the alignment error profiles are repeatable for a given set of scanner conditions, the actuator controller anticipates what the error signal will be before each scanning assembly reaches a given position. An optimized error correction can be calculated based on the error profiles and actuator bandwidth without concerns regarding feedback loop speed, overshoot, and unstable control oscillations. An actuation system driven from error profiles can correct for alignment offsets by actively changing belt tensions at the offsetting drive pulleys and/or changing the position of sensor assemblies relative to the drive belt systems.
Abstract:
Die Erfindung betrifft ein Verfahren zur Bestimmung der absoluten ortsaufgelösten doppelseitigen Topographie und Dicke von Proben mittels zwei gegenüberliegenden konfokal arbeitenden Mikroskopen. Hierbei wird nach Kalibrierung des Geräts von beiden Seiten der Probe die Topographie gemessen, summiert und die Kalibrationsebene subtrahiert. Weiterhin betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.
Abstract:
A method for minimizing measuring spot size and noise during film thickness measurement is provided. The method initiates with locating a first eddy current sensor directed toward a first surface associated with a conductive film. The method includes locating . a second eddy current sensor directed toward a second surface associated with the conductive film. The first and second eddy current sensors may share a common axis or be offset from each other. The method further includes alternating power supplied to the first eddy current sensor and the second eddy current sensor. In one aspect of the invention, a delay time is incorporated between switching power between the first eddy current sensor and the second eddy current sensor. The method also includes calculating the film thickness measurement based on a combination of signals from the first eddy current sensor and the second eddy current sensor. An apparatus and a system are also provided.
Abstract:
An apparatus and associated methods for measuring thickness and velocity of flat moving materials utilizing high frequency radar technologies. Two identical radar-based systems for measuring absolute distances between the source of the radar-generated electromagnetic wave and each surface of a flat sheet material is used to determine the thickness of that material as a relative distance. A pair of high frequency radars situated at different locations used to measure the delay time between the occurrences of fingerprint-like unevenness on the moving flat sheet of material to determine the linear velocity of the moving material sheet.
Abstract:
There is described an apparatus for obtaining images of an element (50) to be inspected, comprising first acquisition means (1 1 ) and second screening means (22) which can be activated according to a first activation mode, and deactivated according to a first deactivation mode; second acquisition means (21 ) and first screening means (12) which can be activated according to a second activation mode, and deactivated according to a second deactivation mode; the first acquisition means (1 1 ), the first screening means (12), the second acquisition means (21 ) and the second screening means (22) aligned along a common optical axis (100); wherein said first activation and deactivation mode and said second activation and deactivation mode occur in a predetermined sequence in order to obtain images of the first side (51 ) and of the second side (52) of the element (50), wherein said first screening means (12) and said second screening means (22) include an optical device (17), respectively, in turn containing a plate-like body (13) provided with colorless and light-diffusing impurities, said impurities adapted to modify the optical path of an input light beam which crosses said plate-like body (13), said plate-like body (13) also operatively coupled to at least one LED (120, 121, 122, 123).
Abstract:
Es wird eine Messeinrichtung (100..103) zum Messen der Dicke (d) eines plattenförmigen Gegenstands (7), angegeben, welche einen ersten Messtaster (21..23) zum Aufsetzen auf einer ersten Fläche (9) des plattenförmigen Gegenstands (7) und einen zweiten bis vierten Messtaster (31..53) zum Aufsetzen auf einer der ersten Fläche (9) gegenüber liegenden zweiten Fläche (10) des plattenförmigen Gegenstands (7) umfasst. Weiterhin umfasst die Messeinrichtung (100..103) Mittel zum Berechnen der Dicke (d) des plattenförmigen Gegenstands (7) anhand der Positionen (81..84), an denen die Messtaster (21..53) den plattenförmigen Gegenstand (7) berühren. Darüber hinaus wird auch ein Messverfahren zum Messen der Dicke (d) eines plattenförmigen Gegenstands (7), angegeben.
Abstract:
The invention provides a new dual-sided Moir wafer analysis system that integrates wafer flatness measurement capability with wafer surface defect detection capability. The invention may be, but is not necessarily, embodied in methods and systems for simultaneously applying phase shifting reflective Moir wafer analysis to the front and back sides of a silicon wafer and comparing or combining the front and back side height maps. This allows wafer surface height for each side of the wafer, thickness variation map, surface nanotopography, shape, flatness, and edge map to be determined with a dual-sided fringe acquisition process. The invention also improves the dynamic range of wafer analysis to measure wafers with large bows and extends the measurement area closer to the wafer edge.