33results about How to "Improve thickness measurement accuracy" patented technology

The invention discloses an ultrasonic detection method of scale thickness in a pipeline. The method comprises the following steps of: utilizing double incidences of ultrasonic waves at different angles, establishing simultaneous equations on the basis of propagation velocities of the known ultrasonic wave on the pipe wall and in the filled fluid and the relationship between an incident angle and a refraction angle of the ultrasonic wave by measuring the penetration time of the ultrasonic waves in the pipeline filled with fluid during the double incidences, and further calculating the velocityand the thickness of a scale layer in the pipeline. With the method, the scale thickness can be measured under the condition that the scale characteristic is unknown, the working detection of the pipeline can be achieved, and the method has reliable accuracy and no destructive effect.

The invention discloses a steel pipe ultrasonic thickness measurement device which comprises a machine frame, a supporting base, a steel pipe tracking assembly and a pipe pressing limiting assembly. The supporting base is installed on the machine frame. The steel pipe tracking assembly is installed on the supporting base, and comprises a tracking device and a detecting device. The tracking device comprises a cylinder, a linear guide rail and a slide block. The detecting device comprises a water tank and an ultrasonic measuring head device. The cylinder and the linear guide rail are both installed on the supporting base. The slide block is installed on the linear guide rail. An output shaft of the cylinder is fixedly connected with the slide block. The slide block is fixedly connected with the water tank so as to drive the water tank to get close to or get away from the pipe pressing limiting assembly. The pipe pressing limiting assembly is installed on the machine frame and used in cooperation with the water tank for clamping and limiting a steel pipe. Through the combination of a steel pipe detection production line actual detection procedure, the water tank is in an initial position when the steel pipe does not enter the detection position, the water tank drives the ultrasonic measuring head device to enter the detection position when the steel pipe enters the detection position, and the high-speed detection during the high-speed movement of the steel pipe can be achieved.

The invention discloses a method for accurately detecting the thickness through an ultrasonic wave equivalent peak value. The method includes the steps of detection of ultrasonic wave echo rising edge arrival time Ts, detection of ultrasonic wave echo falling edge arrival time Tx and calculation of echo peak value time Tf, wherein the thickness of a measured object can be obtained by substituting the echo peak value time Tf into an ultrasonic wave thickness measuring calculation formula S=V*Tf / 2. The invention further discloses a device using the method. The method and the device have the advantages that measuring accuracy is improved, and the error is reduced to 0.001 mm or lower; elements are less influenced by the coupling degree, and measuring stability is improved; the phase error is basically eliminated; miniaturization can be more easily achieved, and the area occupied by a timing chip is about one tenth the area occupied by an existing timing circuit; material difference of the measured object does not influence thickness measurement; spreading of ultrasonic waves can be influenced by the pressure and temperature of an ultrasonic probe, and accuracy can be controlled within the range of 0.02 mm through the method.

The invention provides a measurement device and a measurement method for film thickness, and belongs to the field of photoelectric detection. A laser is used for transmitting laser to be functioned on the surface of a material through a focus lens, so as to generate a laser plasma flashing signal; the laser passes through the focus lens and a band elimination filter, enters a photoelectric detector, and then is converted into a voltage signal processed by a processor through an oscilloscope; when the laser energy is large enough, the laser punctures a film material, appears a pit in a flashing intensity curve of a laser-induced plasma, and a linear relation is formed between the time of appearing the pit and the thickness of the film material. According to the measurement device for the film thickness provided by the invention, expensive micro instruments, such as an AFM (Atomic Force Microscope), cannot be needed, the environmental requirement is lower, no tool contact is caused in an integral measurement process, and the cost of changing the measurement tool can be saved and changed; furthermore, the measurement device is easy to operate and is convenient for a worker to use, and can be integrated on an automatic production line, thereby being likely to be popularized and applied in an industrial field.

The invention discloses a non-contact on-line measurement method for the thickness of an aluminum ingot. In the method, firstly, the modeling of the aluminum ingot mold is simplified, and a functional relationship between the width and thickness of the mold is constructed, so that the thickness that is difficult to measure in the horizontal direction is converted into Easy-to-measure width, the width information is collected by the image taken by the camera; then the RGB color model of the captured aluminum ingot image is converted into the HSV color model, and the color candidate area is extracted according to the S information in the HSV color model; then the original The color image is converted into a normalized grayscale image, and the normalized image is preprocessed and the grayscale morphological operation is used to detect the width of the aluminum ingot; finally, according to the function between the width of the aluminum ingot and the thickness of the aluminum ingot relationship to complete the measurement of the thickness of the aluminum ingot. The selection of the HSV color space in the present invention can identify the width of the aluminum ingot more quickly and stably, thereby realizing the non-contact measurement of the thickness of the aluminum ingot.

The invention relates to a thickness measuring device of a vertical glass edging machine, comprising a bracket, a cylinder mounting frame, a bottom plate, a linear potentiometer and a thickness measuring cylinder, wherein the thickness measuring cylinder is installed on the cylinder mounting frame and is connected with the bracket; the cylinder mounting frame is fixed on the bottom plate; the bracket and the linear potentiometer are fixed on the bottom plate; and the bracket is connected with the linear potentiometer. The thickness measuring device of a vertical glass edging machine disclosed by the invention, has the advantages of simple mechanism, low cost and high thickness measuring precision; and a contact bearing contacts with a glass surface to effectively protect a coating film. The thickness measuring device is installed on a panel on an inlet side of the rack glass of the edging machine to ensure that the position of the grinding wheel can be accurately controlled and regulated in time.

The invention discloses a transverse subtraction differential confocal lens center thickness measuring method, and belongs to the technical field of optical precision measurement. In a confocal measurement system, firstly, small and large virtual pinhole detection areas are set on an Airy disk image detected by a CCD through software, and two detected confocal characteristic curves are sharpened through subtraction processing; secondly, differential subtraction processing is carried out on the sharpened confocal characteristic curves to obtain an axial high-sensitivity differential confocal characteristic curve; thirdly, characteristics accurately corresponding to a zero point of the differential confocal characteristic curve and a focal point of the differential confocal measurement system are used to carry out high-precision fixed-focus locating on the position of a center thickness measurement top point of a measured lens; and finally, the center thickness of the lens is accuratelyobtained through ray tracing compensation, so that high-precision measurement of the center thickness of the lens is realized. The method has the advantages of high measurement precision, strong environmental disturbance resistance, simple structure and the like, and has a wide application prospect in the technical field of optical precision measurement.