Radio wave control is a type of non-destructive control , which is based on the analysis of the interaction of electromagnetic radiation of the radio wave range with the object of control [1] .
Content
- 1 Scope
- 2 Radio wave control devices
- 3 Methods of radio wave control
- 4 notes
- 5 Literature
- 6 References
Scope
Radio wave control is used to solve almost all the main tasks of non-destructive testing : thickness gauge, introscopy , flaw detection and structurescopy . The equipment used is mainly built on the basis of standard or modernized microwave elements. A special element in solving a specific problem can be a source or receiver of radiation, as well as a device for attaching and moving an object. This method controls products made of materials where the radio waves are weakly attenuated, such as: dielectrics , fiberglass , plastics , ceramics , thin-walled metal objects, etc. [2]
Radio wave control devices
- Radio wave flaw detector - designed to detect, record and determine the size or coordinates of defects of the type: violation of continuity and heterogeneity.
- Radio wave thickness gauge - measures the thickness of objects and elements.
- Radio wave dielectric meter - measures the dielectric characteristics of a substance.
- Radio wave densitometer - measures the density or porosity of radiolucent substances.
- Radio wave moisture meter - measures the moisture content of radiolucent substances.
- Radio wave ellipsometer - is necessary for non-destructive testing of an ellipsometric radio wave method.
- OTDR - measures the parameters of the reflected radio wave radiation.
- Radio wave structuroscope - necessary for the qualitative determination of the parameters characterizing the structure.
- Radio introscope - a flaw detector with visualization of a hidden radio image of the control object or multi-element computer- based information processing.
- Quasi-optical radio introscope - contains devices for the quasi-optical formation of a radio image .
Radio wave control methods
| No. | Method | Description |
|---|---|---|
| one | Active | the control object in this method is exposed to a source of radio wave radiation |
| 2 | Passive | in this method, the source of radio wave radiation is the object of control |
| 3 | Amplitude | the method is based on the registration of the amplitude of the radio waves interacting with the control object |
| four | Amplitude phase | the method is based on recording the amplitude and phase of the radio waves interacting with the control object |
| 5 | Geometric | active method, based on recording the spatial position of the maximum intensity of the beam of radio wave radiation transmitted through the object of control or reflected from its rear surface |
| 6 | Polarizing | registration of polarization of radio waves interacting with the object of control |
| 7 | Resonant | this method is based on the registration of resonance and its parameters in the converter-object control system |
| 8 | Spectral | based on registration of the spectrum of radio wave radiation |
| 9 | Radio wave type conversion method | active control method based on recording the type of wave and changes in its structure |
| 10 | The method of reflected radio wave radiation | active method based on recording parameters of radio wave radiation reflected from an object |
| eleven | Free space method | registration of parameters of radio wave radiation after interaction with the control object located outside the transducer or its elements |
| 12 | Surface waves | analysis of surface waves excited in coupled dielectric waveguides |
| 13 | Bolometric | registers the parameters of radio wave radiation with a bolometer |
| fourteen | Photo controlled semiconductor wafer | based on the use of a photocontrolled semiconductor wafer or film as a reactive probe, the thickness of which is much less than the working wavelength |
| fifteen | Thermal paper | registers radiation parameters using thermal paper |
| 16 | Calorimetric | registers parameters of radio wave radiation with a calorimeter |
| 17 | Phase | radio wave phase recorder |
| eighteen | Temporal | active method, based on recording the propagation time of radio waves through the monitoring object |
| 19 | Frequency phase | active phase method, based on the registration of phases of radio waves interacting with the control object, when the generator frequency changes |
| twenty | Polarization phase | active phase method, based on a change in the polarization of radio waves |
| 21 | Ellipsometric | active method, based on recording changes in the parameters of elliptically polarized radio wave radiation |
| 22 | Delayed feedback | active method, based on recording the time or delay phase of the converter feedback signal |
| 23 | Holographic | active method based on holography |
| 24 | Transmitted radiation | registration of parameters of radio wave radiation transmitted through the monitoring object |
| 25 | Scattered radiation | registration of parameters of radiation scattered by the test object |
| 26 | Thermoluminophores | registration of radiation parameters by thermoluminophore |
| 27 | Liquid crystals | registration of radiation by liquid crystals |
| 28 | Thermistor | registration of radiation parameters with a thermistor |
| 29th | Detector | registration of radiation parameters by the detector |
| thirty | Beating | active, spectral method, based on the registration of the low-frequency beat spectrum, formed by the interaction of a continuous frequency-modulated radio wave radiation with the object of control |
Notes
- ↑ GOST 25313-82 “Non-destructive radio wave control. Terms and Definitions"
- ↑ GOST 23480-79 "Non-destructive testing. Radio wave methods. General requirements (as Amended by N 1, 2). ”
Literature
- Matveev V. I. Radio wave control / ed. Klyueva V.V. - M .: Spektr, 2011 .-- 184 p. - ISBN 978-5-904270-51-3 .
Links
Radio wave control . Big Encyclopedia of oil and gas . Date of treatment August 15, 2017.