SU1019380A1 - One-axis ferromagnetic film magnetic flaw density measuring device - Google Patents

Abstract

DEVICE FOR MEASURING DENSITY MAGNETIC DEFECTS uniaxial ferromagnetic films containing block formyrovani gradient magnetic field optically coupled light source, the polarizer and the analyzer, characterized in that in order to povyschoni speed and precision devices, it introduced transmitting a television camera, is optically associated with the analyzer, the amplifier-shaper, the video amplifier and the mixer sequentially connected to it, syn} phogenerators, connected to the second input of the amplifier — a digital computer, X and Y units and a sequentially connected comparator and scan control unit, serially connected command commutators, one-shot and counter, measuring tighter shaper, the first input of which is connected to the second output of the command switch, the second input to the first output of the clock generator, and the output to the second input of the mixer, the output of the video amplifier is connected to the input of the comparator, the second inputs of the laziness unit are scanned to: the third outputs of the command switch, the first output of the control unit The scan is connected to the input of the displacement unit X, and the second output is connected to the input of the displacement unit Y.

Description

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E The invention relates to a magnetic emissive technique and can be used in a computational technique, in particular, at the time of acceptance tests. tia x uniaxial ferromagnetic films in the process of their production,. A device is known for measuring the coercivity of epitaxial film defects containing a gradient magnetic field forming unit, optical coupled light source, a polarizer and an Cl j analyzer. However, this device cannot be used in acceptance tests of ferromagnetic materials due to low speed and accuracy devices. The slow response rate is due to the large number of local areas of the sample material. . which the operator is looking at visually but for detecting defects in them. With a large number of measurements, the accuracy of the device depends entirely on the subjective qualities of the operator, as well as observation. microscopic objects are associated with operator fatigue, which results in the omission of defects. The purpose of the invention is to increase the speed and accuracy of the device. To this end, a device for measuring the density of magnetic defects of uniaxial ferromagnetic films, containing a gradient magnetic field forming unit, an optically coupled light source, a polarizer n analyzer, a transmitting television camera, optically coupled to the analyzer, are connected in series with the amplifier driver , video amplifier and mixer, a synchro generator, kgaochenny to the second input of the amplifier of the driver, the X and Y displacement blocks and the serially connected comparator and control unit scanner, serially connected command switch, one-shot and counter, driver 1H1X meter, the first input. Which is connected to the second output of the command switch, the second input to the first output of the second generator, and the output to the second input of the mixer, the second output of the video amplifier is connected to the input the comparator, the second inputs of the scanning control unit are connected to the third outputs of the command switch, the first output of the scanning control unit is connected to the input of the movement block X. and the second one; a stroke with an input of a transfer unit Y, The drawing shows a structural diagram of a device for measuring the flatness of map defects of uniaxial ferromagnetic films. The device contains a gradient magnetic field forming unit 1, an oracle 2 material of a ferromam material, an optically coupled light source 3, a polarizer 4, an analyzer 5 and transmitted a television camera 6, a displacement unit 7 X, a displacement unit 8 U, a power amplifier 9 , video amplifier 10, synchro generator 11, kok parator 12, mowing control unit 13, command switch 14, one-shot 15, counter 16, shaper viewer signal generator 17, mixer 18, control unit 19, unit 2 O indicator two two-co-op D1, hauling; block 21. The device operates as follows. The measurement method is based on the movement of an isolated wall of a sample of a material in a bias field gradient. The observation of the stripe-domain structure is carried out using the magneto-optical Farad effect. With the help of a gradient magnetic pop block 1, an isolated domain wall is created on the pattern 2. A beam of light from the light source 3 passes through the half-frame 4, sample 2, analyzer 5 and enters the photocathode of the transmitting television camera 6. From the output of camera 6, the video signal from the comb of the strip-domains of sample 2 is amplified and formed by the amplifier driver 9. The frame-reinforcement 9, synchronized by pulses from the synchronous generator 11, it establishes unevenness of the background of the video signal, amplifies the differentiated signal and generates unipolar pulses. From the output of the amplifier, the bodies 9 are formed, the video signal is input to the video amplifier Gel 1O, where the amplification and the formation of the low-frequency component of the video signal. The 11 amp video from the input of the video amplifier 10 is fed to the input of the comparator 12 and to the input of the mixer 18, to the second input of which a signal is generated to form the signal bodies of the measured sights,. synapse impu; from the synchronous generator 11. The mixed signal from the output of the mixer 18 is fed to the video control unit 19, on the koftoparo screen the image of the comb of the stripe-domains 2 is combined into two measuring sights. Before the start, the supervisor is measured using the switch 14 komandv through the driver 17 and the mixer 18 sets the position of the measured vozirov, with one fish one of the sights is mounted on the 1st file of the teeth of the comb of the stripe domains, and the second one on the border corresponding to the allowable value of the coercive force s defects. Thus, between two measuring c. In the open section there is a section that corresponds to the tolerance on the value of the coercive force of defects that does not have a noticeable effect on the quality of the material. The operator, via the switch 14, commands the Start command, which arrives in the control block 13 to be scanned. The signal from the output of the block 13 through the block 7 of the broadcast X yttpai moves by moving the carapace X and simultaneously arrives at the two-coordinate w: a two-dimensional block 21. When scanning a sample, some parts of the stripe are captured by magnetic defects and extracts, and side of the big fields. On the screen of the 19 gprl video control unit, the unchanged position of the cfipaSi comb of domains is observed in the stripe strip, which, if it crosses the second measuring viewfinder (| w1, is detected as a defect. In this case, the cherarator uses a Komi mutat 14 command to deliver a tag. A new pulse of a certain duration. The signal from the signal increases the content of the counter 16 and performs the pen of the recording unit 2-1 to plot the defect on the cartogram. in the case of a sample transition, the sample changes the amplitude of the video signal, to change which the comparator 12 is tuned. The resolving level from the comparator is the Reverse command of the control unit 13, which changes the sign of the supply voltage of the X displacement unit 7 along the X coordinate, and 8 of the Y movement, a signal is sent for displacement along the Y coordinate by one step, and the sample is scanned. When the sample edge passes another edge, the comparator issues a command to the control unit 13; Yun for re, version 7 of unit X, and start of the 8 movement block and W. Step on the coordinates given by the operator U via a control unit 13. In addition, the operator has the ability to control. sample from the command switch. When the scan is completed, the parator issues a Stop command to the control unit 13. As a result, scans No sample of the material over the entire area of the counter 16 records the number of defects, which is indicated by the display unit 2O, and the register unit 21 will contain a cartogram of the defects of this sample. The use of a collapsible device allows the operator to be free from the manual manual scanning of the sample, the tedious day and the measurement of microscopic objects. The operator's fuzzes are reduced to the display on the screen of a video monitor of an enlarged image of the stripe-like structure and the fixation of the moment of the lead defect. As a result, the speed and accuracy of the device is improved, which makes it possible to effectively carry out express control of the density of magnetic defects of ferromagnetic films and to improve the quality of the finished ready-made items.

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Claims (1)

DEVICE FOR MEASURING THE DENSITY OF MAGNETIC DEFECTS OF UNIAXIAL FERROMAGNETIC FILMS, comprising a gradient magnetic field forming unit, optically coupled light source, polarizer and analyzer, characterized in that a transmitting television camera is optically coupled to it to increase the speed and accuracy of the device; the amplifier-driver, the video amplifier and mixer, the sync generator connected to the second input of the amplifier-driver, connected in series with it, blocks remescheniya X and Y and consistently. connected comparator control unit | scanning, serially connected command switch, one-shot and counter, signal generator of measuring visors, the first input of which is connected to the second output of the command switch, the second input is to the first output of the clock generator, and the output is to the second input of the mixer, the second output of the video amplifier is connected to the input comparator, the second inputs of the scan control unit are connected to the third outputs of the command switch, the first output of the scan control unit is connected to the input of the movement unit X, and the second output with the input of the moving block U. SU „.> 1019380 1019380 2