Method for measuring deposition of scales at inner wall of Austenitic boiler tube based ultra-low-frequency vortex
An ultra-low frequency, austenitic technology, applied in the direction of material magnetic variables, can solve the problems of short time limit, interference, poor detection repeatability, etc., to achieve the effect of simple and intuitive operation, low scattering magnetic field, and easy to carry
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[0030] The present invention will be further described below in conjunction with the drawings and embodiments.
[0031] Such as figure 1 , 2 As shown, an ultra-low frequency eddy current-based method for measuring oxide scale accumulation on the inner wall of austenitic boiler tube includes the following steps:
[0032] 1) The excitation coil 3 of the sensor passes an ultra-low frequency current with a resolution of 0.1 Hz and a frequency range of 1 to 40 Hz to generate an ultra-low frequency alternating magnetic field around the excitation coil 3;
[0033] 2) Place the sensor against the outer wall of the austenitic boiler tube;
[0034] 3) The ultra-low frequency alternating magnetic field produces eddy currents on the wall of the stainless steel tube 1 of the austenitic boiler. Due to its extremely low frequency, it can be seen from the standard penetration depth formula of the eddy current that the eddy current has an obstructive effect on the alternating magnetic field; but the ul...
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