摘要:
A method of evaluating an element that includes the step of preparing a thin evaluation sample including a first portion in which a first layer containing a first material and a second layer containing a second material are laminated, a second portion containing the first material, and a third portion containing the second material; and calculating the thickness of the first layer in the first portion.
摘要:
A method of and apparatus for measuring the true thickness, as well as angles of orientation, of a strip article, e.g. a moving metal sheet emerging from a rolling apparatus. The thickness and angles are measured by three penetrating radiation beams (e.g. X-rays) that cross at a common point of intersection, generally but not necessarily, within the body of the sheet article. One beam is generally normal to the sheet article and the others are oriented in the longitudinal and transverse directions of the sheet article. The angles between the beams are generally fixed and known. -The thicknesses measured by the three beams can be used, along with their respective angles of orientation, to calculate the true thickness of the sheet article as well as the angles of sag or off-flatness in the transverse and longitudinal directions at the point of measurement. By measuring these values at various points on the strip article, a thickness and orientation profile of the strip article may be produced.
摘要:
An apparatus and method for using null-particle energy loss to measure the thickness and stoichiometry of films grown by molecular beam epitaxy and other methods. The apparatus for measuring the thickness of films grown on a substrate in a growth chamber, comprises a protective housing having an aperture opening into the growth chamber, a solid state detector disposed in the protective housing, a shutter for opening and closing the aperture, a shield disposed in the housing between the aperture and the solid state detector for shielding the detector, and a calibration source disposed between the shield and the detector for calibrating the measurements made by the detector. A second calibration source disposed between the shutter and the shield, for measuring deposition on the shield.
摘要:
An apparatus and method are disclosed for measuring the area density of a low density material sample. The system includes an x-ray emitter which emits x-rays in the range of 3 kilovolts to 20 kilovolts and the x-rays pass through the sample. An imaging device converts the x-rays which pass through the sample to visible light to produce a visible image corresponding to the sample and in which the visible image has an intensity which varies as a function of the area density across the sample. A camera produces an output signal representative of the intensity of the visible image across the sample while a computer processor processes the signal from the camera after digitization to produce an analysis of the area density of the sample.
摘要:
A method and apparatus is provided for inspection in real-time of inhomogeneities at particular locations of objects using x-radiation. An object is fixed on a conveyor by a system of clamps, and a manipulator positions an x-ray source and detector such that the particular location to be inspected is between the two. X-ray photons passing through the spot to be inspected are recorded by the detector. When the manipulator is at the required position, the electronic control system (ECS) gives a `start` signal and the monitor begins to count the pulses from the detector. After a specified time, a `stop` signal passes from the ECS, and the monitor stops counting, while the manipulator passes to the following position to be inspected. The information coming from the detector is processed in the monitor. If no inhomogeneities are detected, the monitor gives permission for inspection of the following object, otherwise an alarm signal is triggered.
摘要:
A method and an apparatus for an exact measurement of the thickness of a plurality of individual semi-conductor and insulation layers and the determination of the centricity/eccentricity of a medium-voltage and/or high-voltage insulated conductor. The individual semi-conductor and insulation layers of the insulated conductor emerging from an extrusion device are penetrated with X-rays in at least two directions laying within a plane orthogonal to the axis of the insulated conductor. On carrying out a line-scan intensity detection of the X-rays having penetrated the insulated conductor, the thickness of the individual layers as well as the position of the conductor is computed. These values are compared with target ones, and, if necessary, the position of the extruder heads can be corrected accordingly.
摘要:
Radiometric gage for contactless measurement of the surface density or the thickness of a flat product, includes:an X-radiation emitter, whose tube, is directed toward the flat productan X-radiation receiver, whose detector is disposed in order to receive X-radiation scattered or transmitted in attenuated form through said flat product, said receiver delivering a measurement signala member for processing the measurement signal, in order to obtain information representing the surface density or the thickness of the flat productThe anticathode of the tube is made of a material with atomic number as high as possible, preferably greater than 70, which is a good conductor of heat and has a high melting point. A member for adjusting the voltage (V) between the cathode and the anticathode is designed to operate in a predetermined range of relatively low voltages, in order to obtain, in conjunction with the anticathode, an X-ray emission spectrum essentially limited to continuous bremmstrahlung whose maximum energy is fixed by the value of the voltage (V) between cathode and anticathode.
摘要:
A low voltage, compact measuring apparatus for measuring the weight of a material is disclosed which uses a PIN diode in conjunction with a low noise processing circuit to detect particle radiation emitted from a source, which source has its detection intensity affected by a material to be measured. A light blocking, particle radiation permeable material protects the PIN diode from detecting light radiation.
摘要:
A low-voltage, compact measuring apparatus for measuring any one of thickness, density and denier of a material is disclosed which uses a PIN diode in conjunction with a low noise processing circuit to detect particle radiation emitted from a source, which source has its detection intensity affected by a material to be measured. A light blocking, particle radiation permeable material protects the PIN diode from detecting light radiation. A system for controlling the extrusion of a film using the measuring apparatus, and for correcting for erroneous measurement caused by web flutter, are also disclosed.
摘要:
An instrument for measuring thin layer thickness according to the X-ray fluorescence method. Such device has means for observing the area of the surface of the layer through which the geometrical central axis of the X-rays pass, and a table for supporting objects which are to be measured, which has a portion defining a cut-out around the geometrical central axis. The device has illuminating means for lighting the surface through the cut out. An electronic eye is located in the path of light rays from the illuminating means on the ocular side. An image screen is controlled by the electronic eye. Depressor means is provided above the cut-out and has a pressure-applying face adapted for movement between an upper and a lower position, the upper position being at least high enough that the object to be measured can be pushed between the pressure-applying face and the table. The pressure-applying face is adapted to apply force when in the lower position to press the object to be measured against the top of the table and hold the object in a non-positive manner. Switchable means is provided for moving the depressor means in the upper and the lower positions. The pressure-applying face is located about the geometrical central axis of the X-rays, the distance between the pressure-applying face and the geometrical central axis being far less than the distance from the geometrical central axis to the edge of the table. The cut-out in the table has a very much larger area than the cross-section of the X-ray beam.