JPH03225271A - Probe for electromagnetic ultrasonic wave measuring instrument - Google Patents

Abstract

PURPOSE:To prevent the temperature rise of a transmitting/receiving coil without contacting a high temperature substance to be measured with cooling water and to obtain a highly accurate detecting signal by arranging a protection cover between the substance to be measured and the transmitting/receiving coil, cooling the coil by cooling gas and cooling a base mounting the coil by cooling water. CONSTITUTION:The transmitting/receiving coil 7 is mounted on the surface side of the base 8, the base 8 is fixed to the aperture part of a base holder 5 so that the coil 7 is turned to the outside and the protection cover 3 is arranged between the coil 7 and the object P to be measured to form a space 4 between the cover 3 and the coil 7. A heat conductor 11 is stuck to the rear side of the base 8 so as to cover a connection part with a signal cable 9, cooling air 12 is ledinto the space 4 and cooling water 14 is led into the holder 5. Since the coil 7 is directly cooled by the cooling air 12 and the rear face of the base 8 is cooled by the cooling water 14 through the heat conductor 11, the temperature rise of the coil 7 is surely prevented and a highly accurate pipe thickness detecting signal is obtained by transmitting an electromagnetic ultrasonic wave from the coil to the object P to be measured.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a probe for an electromagnetic ultrasonic measuring device.

The present invention particularly relates to a probe for an electromagnetic ultrasonic measuring device that can be suitably applied when the object to be measured is a high-temperature object such as a hot pipe.

2. Description of the Related Art For example, the probe of an electromagnetic ultrasonic measuring device used for measuring the thickness of a conventional hot pipe is formed on a probe holder 21 facing the object to be measured P, as shown in FIG. A probe case 22 is attached to the opening, and the probe case 22 has an opening that faces the object to be measured P and is closed with a protective cover 23, and a substrate 24 equipped with a transmitting/receiving coil 25 is installed inside the opening. Then, the signal case 26 with the signal cable 27 inserted therein is inserted into the probe case 22, and the end of the signal cable 27 is connected to the terminal of the board 24.
Cooling water 28 is also introduced into the gap between the protective cover 23 and the object to be measured P from between the probe holder 21 and the probe case 22.
is introduced to prevent the transmitting/receiving coil 25 from increasing in temperature due to the heat of the object P to be measured.

Further, as shown in FIG. 4, a space 32 is provided inside the probe case 22, a board holder 31 is placed therein, a board 24 with a transmitter/receiver coil 25 attached is installed in the opening of the board holder 31, and the probe case 22 is placed inside the probe case 22. and board holder 31
There is also known a system in which cooling water 33 is introduced into the space 32 between the two to cool the transmitting/receiving coil 25 without the cooling water 33 coming into contact with the object P to be measured.

Problem to be Solved by the Invention However, in the configuration shown in FIG. 3, the cooling water 28 comes into contact with the object to be measured P and is rapidly cooled, which may cause cracks or damage depending on the material.
There were problems such as formation of tissue defects.

Furthermore, in the configuration shown in FIG. 4, the cooling water 33 does not come into direct contact with all the treasures P, but since the cooling water 33 flows in front of the transmitting/receiving coil 25, noise is mixed into the detection signal.
There was a problem that the S/N ratio decreased.

In view of the above-mentioned conventional problems, the present invention provides an electromagnetic ultrasonic measuring device that is capable of obtaining a detection signal with a good S/N ratio, in which the temperature rise of the transmitting and receiving coils cannot be prevented without bringing cooling water into contact with the object to be measured. The purpose is to provide a probe.

Means for Solving the Problems In order to solve the above-mentioned problems, the probe of the electromagnetic ultrasonic measurement device of the present invention has a substrate on which a transmitter/receiver coil is mounted, and an opening in a substrate holder into which cooling water is introduced. The transmitter/receiver coil is mounted on the side with the transmitter/receiver coil facing toward the outside, and a protective cover is disposed between the transmitter/receiver coil and the object to be measured, and a space is formed between the protective cover and the transmitter/receiver coil into which cooling gas is introduced.

The A side of the board is characterized in that it comes into contact with cooling water through a good thermal conductor that covers the connection part with the signal cable.

Effect According to the above configuration, a protective cover is disposed between the object to be measured and the transmitting/receiving coil, cooling gas is introduced between the protective cover and the transmitting/receiving coil, and the back side of the board on which the transmitting/receiving coil is mounted is heated. By cooling with cooling water through a good conductor, it is possible to reliably prevent the temperature of the transmitter/receiver coil from rising even if the target object is at a high temperature, and the cooling water does not flow close to the transmitter/receiver coil. Therefore, a detection signal with high accuracy and a good S/N ratio without noise is obtained, and furthermore, the connecting portion between the signal cable and the board is not directly exposed to cooling water.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a probe holder, which is positioned at an appropriate distance from the outer surface of an object to be measured P such as a hot tube. A probe case 2 is attached to an opening formed through the probe holder 1 toward the object to be measured P. The end of the probe case 2 on the side of the object to be measured P is opened and closed with a protective cover 3. A substrate holder 5 is inserted into the probe case 2 with an appropriate space 4 between it and the inner surface of the probe case 2, and a seal is interposed between the crocodile portion 5a on the outer circumference of the upper end and the upper surface of the probe case 2. The space 4 is sealed with a material 6.

The end face of the substrate holder 5 facing the protective cover 3 is open, and a substrate 8 having a transmitting/receiving coil 7 mounted thereon is installed. The transmitting/receiving coil 7 is attached to the surface of the board 8 on the protective cover 3 side, and the back surface of the board 8 is provided with a connection terminal for connecting to the signal cable 9.

A signal case 10 with a signal cable 9 inserted therein is inserted into the board holder 5, and the connection terminal of the board 8 is connected to the connection end of the signal cable 9 pulled out from the tip of the signal case 1O. Further, a good thermal conductor 11 such as graphite is pasted on the back surface of the board 8 up to the tip of the signal case 10 so as to cover the connection part with the signal cable 9. A cooling air passage 13 for introducing cooling air 12 into the space between the probe case 2 and the substrate holder 5 is provided, and a cooling water 14 is introduced into the substrate holder 5.

According to the above configuration, the cooling air 12 is introduced into the space 4,
By introducing the cooling water 14 into the board holder 5, the transmitting/receiving coil 7 on the front surface of the board 8 is directly cooled by the cooling air 12, and the back surface of the board 8 is cooled by the cooling water 14 via the heat conductor 11. Moreover, since both the front and back surfaces of the substrate holder 5 are cooled by the cooling air 12 and the cooling water 14, the temperature of the transmitting/receiving coil 7 is reliably prevented from rising.

Therefore, when detecting the pipe thickness based on the detection signal obtained by transmitting longitudinal electromagnetic ultrasonic waves from this transmitting/receiving coil 7 toward the object to be measured P and receiving the reflected waves, it is possible to detect the pipe thickness with high accuracy. Highly reliable detection is possible, and since the cooling water 14 does not flow close to the transmitting/receiving coil 7, there is no risk of noise being mixed into the detection signal, and a detection signal with a good S/N ratio can be obtained. In addition, since the connection part between the board 8 and the signal cable 9 is covered with a good heat conductor 11, the cooling water 1
4, and will not interfere with signal extraction or cause corrosion.

A specific example of the cooling effect with the above configuration is 900℃
When we measured the temperature change of the transmitter/receiver coil 7 when measuring the tube thickness of the object to be measured P consisting of a hot tube heated to It was confirmed that it is stable at various temperatures and has a sufficient cooling effect.

Effects of the Invention According to the probe of the electromagnetic ultrasonic measuring device of the present invention, as described above, the protective cover is disposed between the object to be measured and the transmitting/receiving coil, and the cooling gas is introduced between the protective cover and the transmitting/receiving coil. Moreover, by cooling the back side of the board with the transmitter/receiver coil mounted on the front side with cooling water via a good thermal conductor,
It is possible to reliably prevent the temperature rise of the transmitter/receiver coil without bringing the cooling water into contact with the object to be measured, and since the cooling water does not flow close to the transmitter/receiver coil, there is no noise mixed into the detection signal. The effect is that a detection signal with a good S/N ratio can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing the configuration of a probe of an electromagnetic ultrasonic measuring device according to an embodiment of the present invention, and FIG. 2 is a graph showing temperature changes over time when applied to measuring the thickness of hot pipes. , FIG. 3, and FIG. 4 are longitudinal sectional front views showing the configuration of a conventional probe. 2... Probe case, 3... Protective cover, 4...
・Space, 5... Board holder, 7... Transmitting/receiving coil, 8... Board, 9... Signal cable, 11... Good conductor of heat, 12... Cooling air, 14... Cooling water, P...
・Object to be measured.

Claims (1)

[Claims] 1. Attach the board with the transmitter/receiver coil mounted on the surface to the opening of the board holder into which cooling water is introduced, with the transmitter/receiver coil outside, and place a protective cover between the transmitter/receiver coil and the object to be measured. A space is formed between this protective cover and the transmitter/receiver coil to introduce cooling gas, and the back side of the board comes into contact with cooling water via a good thermal conductor that covers the connection with the signal cable. Probe of electromagnetic ultrasonic measuring device.