52results about How to "Accurate thickness measurement" patented technology

An optical translation technique for moving the interrogation spot at which a triangulation system measures the displacement of a target is disclosed. In normal operation of the laser triangulation sensor, an incident laser beam is projected from a sensor head onto a surface of a web that is facing the sensor head. Radiation is reflected from the surface and detected by the sensor. The distance from the sensor head to the web surface is calculated by triangulation. With optical translation, both the incident ray path and the captured ray path are translated with a plurality of high refractive index geometries such that the nominal functioning of the triangulation sensor remains undisturbed. The optimal position on the sheet wherein the interrogation spot will be located can be ascertained.

Method for measuring thicknesses of a film, a foil or a material layer with a measuring head which is spaced away from the film and with which a capacitive thickness measurement is performed, in which an optical distance measurement is performed with a distance measuring device and a distance determined by the optical distance measurement is used in determining the film thickness in the capacitive thickness measurement.

A method and system for correcting for temperature variation in ultrasonic testing systems is disclosed. In one embodiment, an offset is determined for correcting a time of flight measurement, wherein the offset is based on the pulse delays at first and second calibration temperatures. In another embodiment, a factor is determined for correcting a time of flight measurement, wherein the factor is based on clock signal errors at first and second calibration temperatures.

The invention discloses a detection method for a melting effect between a cast copper cooling wall body for a blast furnace and a cast-in cooling water pipe for the blast furnace. The detection method comprises the steps that 1, a cast copper cooling wall of the cast-in cooling water pipe is split along the plane where the center line of the cast-in cooling water pipe is located, an ultrasonic straight crystal probe connected with an ultrasonic flaw detector is placed in the flat inner side of the cooling water pipe, and the interface melting condition of the cooling water pipe and the hot face side of the cooling wall body is detected; 2, test points I, II, III, IV,..., N-1 and N are selected on the flat face of the cooling water pipe, and detection on the interface melting condition of the cooling water pipe and the hot face side of the cooling wall body is performed by repeatedly utilizing the ultrasonic straight crystal probe; 3, the interface melting condition in the cast copper cooling wall is determined through a melting rate definition formula Z=Y / N*100%, wherein Y represents the interface metallurgy melting point number in ultrasonic detection, and N represents the total position point number of the selected test points. The detection method has the advantages of being high in feasibility, good in detection effect, simple in test method, low in cost and wide in application.

The invention discloses a continuous casting billet shell thickness eddy current detection method, and belongs to the technical field of continuous casting billet detection. The object is to overcome the defect of measurement of the thickness of a continuous casting solidification shell in the prior art and provide a method for measuring the thickness of the continuous casting billet shell by employing a multifrequency eddy current measuring method and dividing the inner part of billet into layers according to the conductivity corresponding to the temperature. The method specifically includes steps: an eddy current sensor is arranged on the surface of a casting blank at an outlet of a continuous casting mold, the sensor is a mutual induction differential type sensor, the eddy current sensor performs frequency mixing excitation through a digital frequency synthesizer, frequency mixing of a plurality of excited different frequency signals is performed through an adder, measuring signals are amplified and filtered through a signal conditioning circuit, cross-correlation operation is performed with reference signals of different frequencies in a correlator, the signals are separated, amplitude-phase separation of eddy current impedance signals is performed, the separated signals are transmitted to a computer for data processing through acquisition and conversion, and the thickness of the continuous casting billet shell is obtained.

An apparatus (100) and a method for measuring the thickness (s) for a wall (35) of a transparent object (30); the wall (35) comprises a transparent material (35a) arranged between a proximal interface (31), set between an environment (33) and the transparent material (35a), and a distal interface (32), set between said transparent material (35a) and the environment (33). The apparatus (100) comprises a source (1) of a starting light radiation (2) and a means for focusing it (10), in order to obtain an entering light radiation (5) directed towards the wall (35) that hits the proximal interface (31) of the wall (35) of the object and is in part reflected, in order to generate a first reflected radiation (6). A part of the entering light radiation (5) that is transmitted (7), through the transparent material (35a), hitting upon the distal interface (32), is in turn reflected (8) and crosses in an opposite direction the transparent material (35a) through the proximal interface (31), in order to generate a second reflected radiation (9). A collected radiation (15) given by overlapping the first (6) and second (9) reflected radiations have a difference of intensity that is configured to obtain an interference, which allows determining the thickness (s) of the wall (35). In particular, the means for focusing comprises a lens means (10) that have two main meridians (10a, 10b) orthogonal to each other, such that the entering light radiation (5) is focused on a first virtual focus (F1) in the first meridian plane (10a), and on a second virtual focus (F2) in the second meridian plane (10b). This way, it is obtained that the collected radiation (15) is substantially independent from possible movements of the transparent object (30), and this allows a remarkable reliability and robustness of the measurement with respect to fluctuations and vibrations of the object (30).

The present disclosure proposes a substrate inspection device. The substrate inspection apparatus of the present disclosure may include: a light source that irradiates laser light toward a coating film coated on an area on a substrate; an optical sensor that obtains a reference generated by the laser light being reflected by the surface of the coating film light interference data caused by interference between light and measurement light scattered by the laser light through the coating film; and a processor that derives the coating corresponding to the one region based on the light interference data. The thickness of the film.

Methods and apparatus for measuring a thickness of a coating on an moving object are provided. Light is directed toward the object at a predetermined location on the object such that a portion of the light interacts with the object. A I D and / or 2D maximum intensities for at least one wavelength channel is captured that is produced by the portion of the light interacting with the object. A measured average intensity of the wavelength channel and / or intensities and their arithmetic derivatives of multi wavelength channel geometries is converted into I D (averaged) and / or 2D thickness values. Based on these values an acceptability of the coating is evaluated and thickness calculated.

The substrate inspection apparatus of the present disclosure may include: a first light source that irradiates ultraviolet rays toward a coating film of a substrate mixed with a fluorescent dye; a first photosensor that captures fluorescence generated from the coating film irradiated from the ultraviolet rays and obtaining a two-dimensional image of the substrate; a processor that derives one of a plurality of regions of the substrate based on the two-dimensional image; a second light source that irradiates laser light toward the one region; and a second light a sensor that obtains light interference data occurring from the one area by means of the laser light; the processor can derive a thickness of the coating film with respect to the one area based on the light interference data.

The invention discloses a maintenance and testing device for a cladding machine, which comprises a base, two wheel grooves are arranged at the lower end of the base, a first guide rod is fixed on the upper end of the wheel groove, and the lower end of the first guide rod The first block is fixed, the first guide rod is provided with a wheel plate slidingly connected with it, the lower end of the wheel plate is fixed with a universal wheel, the upper end of the wheel plate is fixed with a vertical rod, and the vertical rod Pass through the base and be fixed on the lower end of the horizontal plate. In the present invention, by setting the wheels that can be hidden, when it is installed at the feeding end and the discharging end of the coating machine, the universal wheel at the bottom of the device is retracted to make the device more stable, and the first anti-static layer is set to prevent static electricity from affecting the material For cladding, by setting a roller whose size is determined according to the actual situation and a roller whose length can be changed at any time, the thickness of the cladding material can be accurately measured during the cladding, and whether there is a fault in the structure of the device can be obtained according to the thickness.