摘要:
A hot flaw detector is equipped with a sensor holding member that has a circular opening through which the material to be inspected will pass and that holds a flaw detecting sensor. Provision is made of an annular cooling liquid injection port that is open at an end of the sensor holding member adjacent to the inner peripheral wall of the circular opening, and provision is further made of an annular cooling liquid introduction port that is open at the other end of the sensor holding member adjacent to the inner peripheral wall of the circular opening. The cooling liquid is injected from the annular cooling liquid injection port, and forms a liquid film along the inner peripheral wall of the circular opening, and is recovered through the annular cooling liquid introduction port. The inner peripheral wall of the sensor holding member is effectively cooled by the liquid film which drips little onto the material to be inspected.
摘要:
Errors occurring in information signals (each including control signals), dummy codes and attribute flags for the information signals and the dummy codes, transferred from a transmitting circuit to a receiving circuit through an interface line, with frames arranged in a serial transfer form are detected by using a cyclic redundancy check (CRC). The dummy codes and attribute flags for the dummy codes are not used in this checking. The re-transmission of signals in the frame resulting from a CRC error generated by the attribute flag for the dummy code changing to that of a control signal in the frame is avoided by: (1) providing, at the transmitting circuit, flags for determining the existence and the number of the control signal in the frame in front of the succeeding frame, and (2) comparing signals, relating to the flags, detected in the receiving circuit with the flags.
摘要:
Method and apparatus for non-destructive inspection of flaws in metal materials include exciting coils centered on a longitudinal axis of a cylindrical or columnar metallic material to be examined being arranged to surround the examinee material. A multiphase alternating current of such a relatively low frequency as to cause the exciting coils to generate a rotating magnetic field which rotates about the longitudinal axis of the examinee material is superimposed with a high frequency alternating current having an inspection frequency selected on the basis of the necessary sensitivity for detection of surface flaws of the examinee material. The composite multiphase current is applied to the exciting coils so that an electromagnetic effect induced in the surface of the examinee material by the high frequency alternating current is rotated for shifting circumferentially about the examinee material along with the rotating magnetic field. A detecting element group disposed in the proximity of the surface of the examined material detects the changing of the electromagnetic effect, dependent on the presence or absence of a surface flaw of the examinee material.