JPH0293755U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the ultrasonic flaw detection device according to the present invention, Fig. 2 is a block diagram showing the circuit from the speedometer to the receiving circuit, Fig. 3 is the circuit diagram of the first comparator, and Fig. 4 is the block diagram showing the circuit from the speedometer to the receiving circuit. FIG. 5 is a graph showing the operation of the first comparator, and FIG. It is a graph which shows the relationship between the conveyance speed area of a test material, and a gain control signal. 1... Winder, 2... Test material, 3... Speed meter, 4
...Timing circuit, 5...Pulser, 6...Tire contactor, 7...Receiving circuit, 8...Speed detection circuit, 9...Gain control circuit, 10...Display device, 13...First comparator, 1
4...First setter, 15...Second comparator, 16...Second
Setting device, 17...first AND circuit, 18...second AN
D circuit, 19... Third AND circuit, 21... First gain adjuster, 22... Second gain adjuster, 23... Third gain adjuster.

Claims (1)

[Claims for Utility Model Registration] 1. Transmitting ultrasonic waves to the material being transported by a probe and receiving defective echoes,
In the ultrasonic flaw detection device that detects flaws in the test material by amplifying and outputting this signal using a receiving circuit, the speedometer measures the transport speed of the test material and outputs the measured transport speed signal. and a speed detection circuit that receives the transport speed signal, identifies a region corresponding to the transport speed signal among a plurality of transport speed regions that are divided in advance according to the magnitude of speed, and outputs an identification signal. a plurality of gain adjusters for controlling gains corresponding to each of the plurality of conveyance speed zones; upon receiving the identification signal, a corresponding one of the plurality of gain adjusters is selected according to the identification signal; a gain control circuit that causes a gain adjuster to output an adjusted output signal, and the receiving circuit amplifies and outputs the defective echo with a gain controlled according to the adjusted output signal. Ultrasonic flaw detection equipment. 2. The ultrasonic flaw detection apparatus according to claim 1, wherein the speed detection circuit includes a comparator that has a hysteresis characteristic and identifies the transport speed zone. 3. An ultrasonic flaw detection method in which ultrasonic waves are periodically transmitted and received by oblique incidence to the transported test material, and the received defect echoes are amplified and displayed to detect flaws in the test material, including: Measuring the conveyance speed of the material to be inspected and outputting a conveyance speed signal; Upon receiving the conveyance speed signal, select one of a plurality of conveyance speed zones preliminarily divided according to the magnitude of the speed, corresponding to the conveyance speed signal. identifying the area and outputting an identification signal; receiving the identification signal and outputting an adjustment output signal for controlling a gain corresponding to each of the plurality of transport speed areas in accordance with the identification signal; An ultrasonic flaw detection method characterized by receiving an adjusted output signal and amplifying the defect echo with a gain controlled according to the adjusted output signal. 4. A speedometer that measures the conveyance speed of the material to be inspected and outputs the measured conveyance speed signal; a speed detection circuit that identifies a zone corresponding to a speed signal and outputs an identification signal; and a plurality of gain adjusters that control gain corresponding to each of the plurality of transport speed zones, and a gain control circuit configured to output an adjusted output signal from a corresponding one of the plurality of gain adjusters in accordance with the identification signal.