Nkk Corporation

Nippon Kokan Kabushiki Kaisha

Isamu Komine

Akio Nagamune

Kouichi Tezuka

Mitsuaki Uesugi

Masaichi Inomata

Nobuhisa Hasebe

Hiroshi Kawada

Katsuhiko Shimada

Hideya Tanabe

Yoshiro Yamada

Takao Miyazaki

Koichi Tezuka

Akihiko Inoue

Yoshiyuki Kanao

Shinji Kuriyama

Masaki Komatani

Masataka Kobayashi

Shiro Ariga

Tsuguo Takahashi

Masayoshi Yamada

Shuichi Tsunozaki

A distance measuring method and an apparatus therefor, in which used are first and second pseudo random signals which are equal to each other in pattern but slight different from each other in frequency. A first time-series pattern obtained by multiplying the first pseudo random signal by the second pseudo random signal is generated, laser light intensity-modulated with the first pseudo random signal is radiated to a target, the light reflected from the target is received, and a intensity change of the received reflected-light is converted into an electric signal. A second time-series pattern is obtained by multiplying the electric signal as a reception signal with the second pseudo random signal. The distance to the target is measured by calculating the time difference between the first and second time-series patterns.

Distance measuring method and apparatus therefor

Method and apparatus for obtaining sectional information of the

Disclosed is a in-furnace slag level measuring method for measuring a slag level in a convertor and an apparatus therefor. A sublance and an antenna of a microwaver radar are arranged exchangeable therebetween so that the sublance and the antenna are alternatively inserted in to the convertor from about the convertor. The antenna is inserted into the convertor in first and middle stage of the refining operation of the converter to thereby measure the slag level, and the sublance is inserted into the convertor to thereby perform various measurement.

In-furnace slag level measuring method and apparatus therefor

An in-furnace level meter for measuring a slag level, or the like, in a convertor, and an antenna used therefore. An antenna position is controlled so that the distance between the antenna inserted in the convertor and the slag level can be established to be constant or within a predetermined range. A water-cooled structure antenna is used as the antenna.

In-furnace level meter and antenna therefore

Disclosed is an in-furnace slag level measuring apparatus having a microwave radar for measuring a slag level in a convertor or the like. The level of a transmission signal or a reception signal is adjusted in accordance with the level of a detection signal so that the signal level in the microwave radar is adjusted to be constant. Further, the level measurement value and the detection signal are inputted and the level measurement values obtained in a predetermined time are subjected to averaging operation. In the averaging operation, when the detection signal is smaller than a set point, the averaging operation is performed while disregarding the level measurement value at that time.

In-furnace slag level measuring apparatus

A method and apparatus for measuring a three-dimensional curved surface shape based on a new measuring principle that a surface of an object to be measured is coded with information relating to a slit light which is used as a medium and moved or rotated at a constant speed. The manner in which a linear reflected pattern of the slit light is moved over the surface of the object to be measured is picked up by a television camera to form a composite image in which a value of each of picture elements in the image is represented by information relating to the slit light, e.g., a position, time or projection angle of the slit light at an instant that the slit light passes through one of positions on the object surface corresponding to that picture element. Then, a difference in value between each corresponding picture elements of the composite image and another composite image formed similarly with respect to a reference plane is determined to measure a three-dimensional curve surface shape of the object to be measured.

Method and apparatus for measuring a three-dimensional curved surface

An image composing apparatus adapted to produce a composite image in which a value of each of picture elements is represented by a maximum value or minimum value of the brightness of a video signal as well as a corresponding other signal at the instant of the maximum or minimum value. A composite image is formed in which a value of each of picture elements is represented by a count of synchronizing signals or an externally applied timing, position or angle indicative external input signal at an instant that the video signal attains the maximum value or the minimum value for each picture element.

Image composing apparatus

A method and apparatus adapted to measure a three-dimensional curved surface shape quantitatively with high speed. A pattern of interference fringes on a surface of an object to be measured is picked up so that while moving a reference plane (or the object to be measured) in the direction of an optical axis, the resulting video signal is processed to form a composite image in which a value of each of picture elements is represented by a position of the reference plane (or a position of the object to be measured) at an instant that one of positions on the object surface corresponding to that picture element in the image attains a maximum brightness. Then, a three-dimensional curved surface shape of the object to be measured is measured on the basis of the composite image.

Circularly polarized light caused to be incident on a film surface is converted into three light beams by optical flats to obtain electrical signals corresponding to the intensities of the respective light beams. Two ellipsometric parameters .psi. and .DELTA. are claculated from these three electrical signals.

Film thickness-measuring apparatus

A method and an apparatus for determining a length of a pipe utilizing sound waves, which comprise: transmitting sound waves having a prescribed frequency and a prescribed transmission intensity toward the interior of a pipe at one end thereof by an oscillator; receiving the thus transmitted sound waves at the other end of the pipe by a receiver; measuring a propagation time required for the sound waves to pass through the air in the pipe from the one end to the other end thereof by a clock; and determining a length of the pipe by a length calculator on the basis of a predetermined propagation velocity of the sound waves in the air in the pipe and the thus measured propagation time of the sound waves.

Method and apparatus for determining length of pipe utilizing sound waves

In a continuous casting mold which comprises: a plurality of ultrasonic vibrators, fitted to the outer surface of each of the side walls of said mold, along a plurality of straight lines at prescribed intervals in the axial direction of said mold, and said plurality of straight lines being arranged at prescribed intervals; the improvement characterized in that: each of the side walls of said mold is divided into a plurality of sections corresponding to said straight lines of said plurality of ultrasonic vibrators fitted to the outer surface of each of said side walls.

Continuous casting mold provided with ultrasonic vibrators

Method of vibrating continuous casting mold

The surface defect detecting apparatus for rotating cylindrical metal pieces which move in a lengthwise direction relative to a sensor block, has a plurality of eddy-current flaw detecting coils facing the test piece. The sensor block rotates about a horizontal axis extending vertically with respect to the axis of the test piece to follow up deflections of the test piece in the direction of the axis of rotation. Front and rear ends of the sensor block, have a pair of guide wheels that engage the piece; also present are color marking nozzles for marking defective areas in response to detector signals. Relative movement in the longitudinal direction of the test piece is carried out by means of a carriage carrying the sensor block. Each guide wheel is spaced from another in a plane transverse to the longitudinal direction of the test piece. A number of coils with designated impedances are connected to a generator and are disposed in longitudinal direction of the test piece in a single sensor holder within the sensor block. The holder has turning wheels at front and rear ends thereof in a longitudinal direction of the test piece, and are each positioned between the guide wheels in a direction for spiral scanning, and in rotatable contact with the outer surface of the test piece. Impedances of the coils are selected to allow feedback amplifiers to form a feedback circuit with two of the coils and are linear for eddy-current signals corresponding to different flaw depth ranges. Signals of a detector unit associated with different flaw depth range are amplified within the linear characteristic range and supplied to nozzles which spray different colors depending on flaw depth.

Surface defect detecting apparatus for use with rotating circularly

A surface defect detecting apparatus having at least one sensor block for movement in respect of rotating cylindrically shaped electrically conductive metallic material to be inspected by scanning an outer portion of the surface of the material. The sensor block has spaced guide wheels at front and rear parts thereof in the spiral scanning direction which rotate in response to the rotation of the material; and a coil holder for supporting a plurality of eddy-current flaw detecting coils arranged longitudinally in a row in the direction of movement, intermediate between pairs of guide wheels at the front and rear parts opposite to the outer surface of said material with a predetermined gap therebetween. A turning wheel at each of the front and rear parts of the coil holder is rotatable with respect to the outer surface of the material so as to maintain the predetermined gap. An AC signal of a predetermined frequency applied from an oscillator to the coils produces corresponding eddy currents in material to be inspected. The coils are divided into a first group and a second group with one group of coils being defined by coils other than those coils in an adjoining row to that group, phase shifters feed the AC signal to coils of the first group resulting in a shift in phase by a predetermined amount, as reference signal to detectors formed as phase detectors. The phase detectors are associated with coils of the latter group, with a phase different from that of the AC reference signal respectively applied to a second group of coils and to the phase detectors of the first group of coils.

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Tokyo, Japan

Isamu Komine