SU1434246A1 - Ultrasonic resonance thickness gauge - Google Patents

Abstract

The invention is intended to study materials using ultrasonic vibrations, and more specifically to measure the thickness of a metal, and can be applied in the chemical, petroleum, aviation and other areas of national economy. The aim of the invention is to increase the reliability of thickness control and expansion, measurement range. To achieve the set in a known ultrasonic thickness gauge, the principle of which is based on determining the resonant frequency of the test object, a linear voltage generator, an operational amplifier, a current amplifier to a resistor are introduced feedback, providing a linear magnetization reversal of the modulator during the formation of the probing signal, as well as a controlled attenuator, amplifying the amplitude Produce resonant pulses. 1 il. with f

Description

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The invention of holograms with: x acoustical methods of non-destructive contr;; l and can be used to measure the thickness of metal - than -:; products with one-way access: 1 ohm to the surface

The purpose of the image is 5 - poz-lshakii authenticity of the control and the expansion of the first range of the grain,

In the drawing there is an old unit block: S: - a mama of ultrasounds about the resonance of the CSNS; about the thickness gauge;

The thickness gauge is a power supply connected in series by piezotraiser. Generator 1e generator 2 tsachaklyuy :: frequency,. poch 3, ullaLYa8;: - about Y; gnutyuator 4; block 5 processing ;;:: j: - ;: v OHai: c- nzh pulses, divider 6 and 3 hectares ;; but radial tube . I follow the connected measurement; L: generator 85, block 9, garnon n switches, spectrum analyzer 10, key li and one 12 of processing from the dead slips: fcGov. the output of which is connected to the x first input of the cathode-ray tube, 7 5 successively with a single divider 13 and block 14 of the digital o5.

operative amplifier 11 17 current 5 modulator 13 and feedback feedback, commutator :: switchboard which 2toad :: key input 3 ,. and the second second and the inputs of the analyzer and the key 11 are the first one: pa-18 is connected to the second: rator 2 as the input to the analyzer 10, the second output is from the resistor; A second connection of the amplifier and the amplifier is 16, the output 15 is linearly connected to Eti & 1 BHODO- "attenuator 4 ,, in the course of co; and the second inlet is Alec rp: tubes 7, and a Bhod divider: with a meter; :: o gv, “Toltsdacomer works with. once "

Generator 15 linearly generates the sigxSH5 output on i-.

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shakes j key and closes; through the winding mazgnitnoi:.; 18 begins to change ao .. law. Frequency of the loop circuit wound on the core of asp

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The material and the magnetic modulator 5 placed in the field also vary linearly, therefore, the frequency of the generator 2 changes. During the measurement process, the converter 1 is mounted on product 5 whose mass must be measured. When the oscillating frequency generator 2 operates at the moment when the thickness of the sample under test is a multiple of half the wavelength of ultrasonic oscillations, the product evolves the standing water, as a result of which the high-frequency signal of the generator 2 is modulated in amplitude by resonant KivfflyjibcaMK products, the input of the attenuator 4, to the second} of which is supplied, is a sawtooth voltage from the generator 15 linearly and alternately. The control of the sawtooth attenuator resistance is constructed in such a way that it increases with increasing amplitude of resonant impulses 4 coming to the attenuator input; moreover, equal amplitude resonant pulses arrive at the input of the processing unit 5 of the resonant pulses, where a divider 6 is fed to vertically deflecting plates by an electron-beam tube 1,

In ultrasonic resonant thicknesses of 1d; in other rooms, the thickness of the product being monitored is determined by indirectly measuring the frequencies of acoustic resonances. For this purpose, in the thickness gauge, a measuring generator 8, which does not absorb high-frequency oscillations, is received at the inputs of the block 9 for the separation of the harmonic components and the divider 13. In the block 9 for the harmonics, the second, three, four, eight ..., 5 harmonic components. In the second period of operation of the switch 20, the oscillating frequency generator 2 stops its operation and opens the spectrum analyzer 10, where the harmonic components are highlighted as high frequency beats, detected and input to the second key 11j which opens at the time of the analyzer 10. From the output of the key 11, the signal enters the processing unit 12 of the measuring pulses j amplified and is fed to the vertically deflecting plates of the electron beam tube 7, on the screen of which

measuring pulses with resonant ones by changing the frequency of the measuring generator 8. The frequency at which the combination occurs is equal to the acoustic resonance frequency of the product under test, which carries information about the thickness. The signal of the generator 8 through the divider 13 enters the input of the digital processing unit 14, where it is converted into the value of the measured thickness.

The linear magnetization reversal of the magnetic modulator 18 is provided by comparing the signals of the generator 15 of a linearly varying voltage to the modulator 18 itself, removed from the feedback resistor 19 on the operational amplifier 16, and controlling the process of switching the differential signal amplified by the amplifier 17 current.

Thus, in the proposed ultrasound resonant thickness gauge, a linear modulation modulator is carried out, which results in a uniform distribution of resonant and measuring pulses on the screen of the cathode ray tube, which provides an increase in the reliability of control, and also results in a distortion magnetization reversal zone.

Claims (1)

Invention Formula The ultrasonic resonance thickness is the number that contains the modulator, the switch, the piezo transducer connected in series, the oscillating frequency generator and the first key connected in series to 15 25 342464. resonance pulses, a first divider and a cathode ray tube, a measuring generator connected in series, a harmonics separation unit, a spectrum analyzer, a second switch and a measuring pulse processing unit, a second splitter connected in series, and a digital processing unit; the modulator output is connected to the second inputs of the oscillating oscillator frequency and spectrum analyzer, the first output of the switch is connected to the second input of the first key, and its second output is connected to the third input of the spectrum analyzer and the second input to the second The second key, the input of the second divider is connected to the output of the measuring generator, and the output of the processing unit of the measuring pulses - with the first input of the cathode ray tube, characterized in that, in order to increase the reliability of control and extend the measurement range, it is equipped with a controlled attenuator, The first input is connected to the output of the first key, and the output is connected to the input of a processing unit for resonant pulses connected in series by a linear-varying voltage generator, an operational amplifier and an amplifier t The output of which is connected to the modulator input and feedback resistor connected to the second output of the modulator and the second input of the operational amplifier, and the generator output of a linearly varying voltage is connected to the input of the switch, the second input of the controlled attenuator and the second input electronically -beam tube. 20 thirty 40