초록 ▼

Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a t

Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a transverse ultrasonic wave generated by the EMAT is the same as the rolling direction of the metallic object of rolled material, and ft is a resonance frequency when a direction of the amplitude of the transverse ultrasonic wave is perpendicular to the rolling direction. A value R is calculated by using: R=(fr-ft)/{(fr+ft)/2}. The hydrogen concentration of the metallic object is calculated on the basis of the experimentally determined relation between the value R and hydrogen concentration.

대표청구항 ▼

Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a t

Electromagnetic acoustic resonance method by using EMAT is used for determining hydrogen concentration of radioactive metallic object. In one preferred embodiment, resonance frequencies fr, fr are measured with the EMAT, where where fr is a resonance frequency when a direction of an amplitude of a transverse ultrasonic wave generated by the EMAT is the same as the rolling direction of the metallic object of rolled material, and ft is a resonance frequency when a direction of the amplitude of the transverse ultrasonic wave is perpendicular to the rolling direction. A value R is calculated by using: R=(fr-ft)/{(fr+ft)/2}. The hydrogen concentration of the metallic object is calculated on the basis of the experimentally determined relation between the value R and hydrogen concentration. ongitudinal direction; and a guiding bracket attached to a wall surface and having a concave groove in a longitudinal direction so that the first fixed bracket can be slidably coupled therewith in concave and convex manner. 11. The property box of claim 10, wherein the second air cooler includes a second cryogenic semiconductor operated by a power supply applied from a power supply section for generating cool and hot air. 12. The property box of claim 10, wherein the second air cooler includes a compressor, capillary tube, and a vaporizer for circulating a coolant in a predetermined freezing cycle. 13. The property box of claim 10, further comprising a third receiving section installed within the housing space for receiving the predetermined properties to be in optimal contact with the cool air discharged to the second cool air discharging outlet(s) of the second housing main body. 14. The property box of claim 10, further comprising a second water collecting section slidably coupled with a lower portion of the second air cooler for guiding and collecting water generated from the housing space of the second air cooler to a water collecting hole. 15. The property box of claim 10, wherein the second air cooler is housed within a predetermined upper portion of the second housing main body for circulating the cool air generated from the second air cooler in the housing space in a convection manner. 16. The property box of claim 10, further comprising: at least one or more latch(es) formed on at least on an upper or on a lower portion of the rear surface of the second housing main body integrally or separately; and a second fixed bracket bolted and attached to the wall surface by means of a fixed screw to correspond to the latch(es) and having an upward concave groove so that the latch(es) can be hung up on the wall. 17. The property box of claim 10, further comprising a plate of a predetermined size having at least one or more second fixed bracket(s). 18. The property box of claim 16, further comprising a sliding prevention section formed on either one side of the second fixed bracket so that the latch(es) coupled with the second fixed bracket may not be slid toward either one side thereof. 19. The property box of claim 16, wherein the latch(es) formed on the second main body is cross-cut in a longitudinal direction. 20. The property box of claim 19, wherein the second fixed bracket is cross-cut in a longitudinal direction to correspond to the latch(es). 21. The property box of claim 16, further comprising at least one or more supporting member(s) fo