Ultrasonic flaw detector noun explanation two
21. Detection frequency: the ultrasonic frequency used in ultrasonic testing. Usually 0.4 MHz ~ 15MHz.
21. Detection frequency: the ultrasonic frequency used in ultrasonic testing. Usually 0.4 MHz ~ 15MHz.
22. Echo frequency: The reciprocal of the peak interval time obtained by the extended observation of the echo on the time axis.
23. Sensitivity: A measure of the smallest ultrasonic signal that produces a discernible indication on the fluorescent screen of an ultrasonic flaw detector.
24. Sensitivity margin: the difference between the standard defect detection sensitivity and the maximum detection sensitivity expressed at a certain level in an ultrasonic flaw detection system.
25. Resolution: The ability of an ultrasonic flaw detection system to distinguish two adjacent defects of a certain size that are closest to each other in the lateral, longitudinal or depth directions.
26. Suppression: In the ultrasonic flaw detector, in order to reduce or eliminate low-amplitude signals (electrical or material noise), a control method to highlight larger signals.
27. Gate: an electronic method selected for a period of time for monitoring the flaw detection signal or for further processing.
28. Attenuator: A device that quantitatively changes the signal voltage (sound pressure). The amount of attenuation is expressed in decibels.
29. Signal-to-noise ratio: the ratio of the amplitude of the ultrasonic signal to the maximum background noise amplitude. Usually expressed in decibels.
30. Blocking: The phenomenon of sensitivity reduction or malfunction caused by the receiver immediately after receiving the transmitted pulse or strong pulse signal.
31. Gain: the logarithmic form of the voltage amplification of the receiver amplifier of the ultrasonic flaw detector. Expressed in decibels.
32. Distance Amplitude Curve (DAC): According to the specified conditions, a set of curves drawn by three parameters from the distance of the known reflector that generates the echo, the gain of the flaw detector and the size of the reflector. In actual flaw detection, the equivalent size of the defect can be estimated from this curve from the measured defect distance and gain value.
33. Coupling: It plays the role of conducting sound waves between the probe and the test piece.
34. Test block: a sample used to identify the characteristics of the ultrasonic testing system and the sensitivity of flaw detection.
35. Standard test block: the test block whose material, shape and size are all verified by the competent authority or authoritative organization. Used for performance testing and sensitivity adjustment of ultrasonic testing devices or systems.
36. Comparative test block: a test block that adjusts the sensitivity of the ultrasonic testing system or compares the size of the defect. Generally, it is made of materials with similar characteristics to the tested materials.
37. Probe: an electroacoustic conversion device that transmits or receives (or both transmits and receives) ultrasonic energy. The device generally consists of a trademark, plug, housing, backing, piezoelectric element, protective film or wedge.
38. Straight probe: a probe used for vertical flaw detection, mainly used for longitudinal wave flaw detection.
39. Oblique probe: a probe used for oblique shot flaw detection, mainly used for shear wave flaw detection.
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