JPH0656320B2 - Ultrasonic sound velocity measuring device in subject - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ultrasonic sound velocity measuring device in a subject, and particularly to a device suitable for easily measuring the sound velocity in a short time.

Note that the subject here refers to a solid.

[Conventional technology]

For the conventional measurement of sound velocity of an object, a simple measurement method in which a normal ultrasonic flaw detector is used and measurement is performed by a pulse reflection method is generally widely used. This is because the existing ultrasonic flaw detector can be used for sound velocity measurement, the measurement is simple, and the measurement accuracy of a certain level of sound velocity required for ultrasonic flaw detection is, for example, 1%.
This is because accuracy within a margin of error can be obtained. However, the calculation of the sound velocity in this measurement method is generally (for the one-probe method) Here, V = sound velocity (m / sec) T = plate thickness of the subject (m) t = propagation time of ultrasonic waves (sec) Therefore, it is necessary to measure the plate thickness T of the subject.
The plate thickness T is conventionally measured using a micrometer, a caliper, etc., and is performed in a step different from the step of measuring the propagation time t with an ultrasonic flaw detector. On the other hand, the propagation time t is the time between the first bottom echo B 1 and the second bottom echo B ₂ of the subject displayed on the CRT such as an ultrasonic flaw detector, or the second bottom echo B ₂ The time between and the third bottom echo B ₃ is read and the stored or recorded value is used. As described above, conventionally, since the plate thickness T and the propagation time t are separately calculated and the sound velocity is calculated by the above equation, the calculation of the sound velocity always requires two or more steps, and the plate thickness measurement position and the propagation in the object are measured. There is a problem in that the time measurement position is likely to be displaced, the reliability of the measurement result is lowered, and the measurement is troublesome and takes a lot of time.

[Problems to be solved by the invention]

As described above, in the conventional sound velocity measurement of the subject, the plate thickness of the subject and the propagation time required for the calculation of the sound velocity are obtained in separate steps, so that much labor and time are required for the measurement, and the reliability of the measurement result is high. However, there is a problem that the deterioration of

The present invention solves the above-mentioned problems of the prior art, and provides a sound velocity measuring device that can easily and quickly measure the sound velocity of a subject, and can obtain a reliable measurement result. To aim.

[Means for solving problems]

According to the present invention, a linear gauge having a spindle that is pressed in a certain direction by a spring and that moves a certain distance by expansion and contraction of the spring, and a plate thickness of an object to be examined are connected to the linear gauge and a moving distance of the spindle is calculated. A plate thickness calculation unit and an ultrasonic wave transmission / reception unit that detachably attaches a probe to the tip of the spindle, transmits ultrasonic waves to the probe, and receives reflected waves from the subject received by the probe. , The ultrasonic wave transmission unit is connected to the propagation time calculation unit for calculating the propagation time of the subject, and the plate thickness signal of the plate thickness calculation unit and the propagation time signal of the propagation time calculation unit are simultaneously input to calculate the sound velocity. The sound velocity measuring device for ultrasonic waves in a subject provided with a sound velocity calculation unit that can measure the sound velocity of the subject easily and in a short time, and can obtain highly reliable measurement results. is there.

[Action]

The probe is removably attached to the tip of the spindle that is always pressed in a certain direction by being installed in the linear gauge. The spring is expanded and contracted by an external force to move the spindle by a predetermined distance. First, the probe and the surface of the surface plate on which the subject is set are directly probed, and a plate thickness calculation unit that is connected to the linear gauge and receives the signal from the linear gauge to calculate the plate thickness Give orders. Next, the measurer shortens the spring to move the spindle, inserts the subject into the gap between the probe and the surface plate generated by the movement, and sets the object on the surface plate. In this case, if the linear gauge is held by the holding member at the position where the spring is shortened, the spindle is pressed toward the subject side by the compression force of the spring, and the probe presses the subject with a constant force. In this state, the plate pressure of the subject is immediately calculated by sending a signal of the movement distance of the spindle to the plate pressure calculator. On the other hand, in the same state as described above, an ultrasonic wave is transmitted from the ultrasonic wave transmitting / receiving unit to the probe, and a reflected wave from the subject is received by the ultrasonic wave transmitting / receiving unit via the probe. This received signal is sent to the propagation time calculation unit connected to the ultrasonic wave transmission / reception unit, and the propagation time is calculated in parallel with the calculation of the plate thickness. Information on the calculated propagation time and the plate thickness is simultaneously input to the sound velocity calculator to calculate the sound velocity.

For a new subject with a different plate thickness, the sound velocity can be measured in the same manner as above just by changing the moving distance of the spindle, but if the physical properties of the subject, such as specific gravity, are different, Since the probe can be attached and detached, the probe is replaced with one suitable for the object to be measured.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a front view of the apparatus of this embodiment, FIG. 2 is a sectional view of the lower part of the spindle, FIG. 3 is a sectional view showing an example of a probe, and FIG. 4 is IV-IV loss of FIG. FIG. 5 is a block diagram of the device. In the figure, 1 is a stand, 2 is a pole erected on the stand 1, 3 is a guide arm that can move up and down along the pole 2, and as shown in FIG. It has a hole 3a and a hole 3b with an interruption for supporting the linear gauge 5 and fitting it in a part thereof. The guide arm 3 is used for the pole 2 at the interruption part of the hole 3a.
A knob 4 that locks at any height of
A knob 6 for locking the linear gauge 5 to the guide arm 3 is attached to the interruption portion of the hole 3b. Reference numeral 7 denotes a spindle incorporated in the linear gauge 5, which is constantly pushed downward by a compression spring (not shown) in the linear gauge 5, and the spring is expanded and contracted by an external force (in this embodiment, a measurer). This allows it to be moved a fixed distance. A probe 8 is removably attached to the lower end of the spindle 7, and as shown in FIG. 2, the detachable part is formed to have a diameter that allows the probe 8 to be fitted into the housing 16 of the probe 8 without play. The guide pin 18 is provided so as to project from the diameter so that they are not easily separated when they are fitted.
A hole 7a is formed in the axial center portion, and a female-side contact plug 19 into which the contact plug 17 of the probe 8 is fitted is provided at the end of the hole 7a. Transducer 8 has transducer 14 and damper 15 has housing
The spindle 7 is provided inside the housing 16 and is attached to one end of the housing 16.
A hole 8a into which is inserted and a front plate 13 is provided on the outer surface of the vibrator 14 on the other end side. A recess 8b into which a guide pin 18 is fitted is provided on the outer periphery of the hole 8a, and a connector 17 as a port for taking out a signal line from the vibrator 14 is provided at the center. A surface plate 9 is placed on the stand 1, and a subject 10 is placed on the upper surface of the surface plate 9. Reference numeral 20 denotes a plate thickness T calculation unit of the subject 10, which has a function of instructing a plate thickness zero, and is connected to the linear gauge 5 by a cable 11. Reference numeral 21 denotes an ultrasonic wave transmitting / receiving unit that transmits ultrasonic waves to the probe 8 and receives reflected waves from the subject 10 received by the probe 10, and is a hole of the spindle 7.
It is connected by a cable 12 and a signal line passing through 7a. twenty two
Is a propagation time calculation unit that is connected to the ultrasonic wave transmission / reception unit 21 and calculates the propagation time of ultrasonic waves in the subject 10 based on the transmission signal. Reference numeral 23 is a sound velocity calculation unit that calculates the sound velocity by simultaneously inputting the plate thickness signal of the plate thickness calculation unit 20 and the propagation time signal of the propagation time calculation unit 22.

Next, the operation of the device will be described. First, loosen the knob 4 and the guide arm 3 with the subject 10 not present on the surface plate 9.
Is lowered together with the linear gauge 5, the probe 8 and the like, and the front plate 13 of the probe 8 is brought into direct contact with the surface plate 9 to give a plate thickness calculation unit 20 a command of zero plate thickness dimension. Next, the compression spring (not shown) pushing the spindle 7 downward is shortened to move the spindle 7 upward. And the front plate 13 that was generated by moving
The subject 10 is inserted and set in the gap between the platen 9 and the platen 9. Since the spindle 7 is constantly pushed downward by the compression spring, the probe 8 attached to the lower end of the spindle 7 presses the subject 10 with a constant force.
In this state, the plate thickness T of the subject 10 is calculated by sending a signal of the moving distance of the spindle 7 to the plate thickness calculating section 20. On the other hand, in the above-mentioned state, the probe 8
Then, the ultrasonic wave is transmitted to the ultrasonic wave, and the reflected wave from the subject 10 is received by the ultrasonic wave transmitter / receiver 21 via the probe 8. This received signal is sent to the propagation time calculation unit 22, and the propagation time is calculated simultaneously with the calculation of the plate thickness T. Information on the calculated propagation time and the plate thickness is simultaneously input to the sound velocity calculation unit 23, and the sound velocity is immediately calculated only by bringing the probe 8 into contact with the subject 10.

If the plate thickness of the object 10 to be measured is different, the spindle 7
Different moving distances, the plate thickness calculating section 20 calculates different plate thicknesses, the propagation time calculating section 22 calculates different propagation times, and the sound velocity is measured as described above. Also the subject 10
If the physical properties such as material and specific gravity are different, it can be replaced by a probe suitable for the object to be measured, and not only the sonic velocity device but also the specific gravity measurement having a correlation with the sonic velocity should be performed. You can

In this way, the sound velocity can be measured only by bringing the probe 8 into contact with the subject 10, and the measurement can be performed without any misalignment because the measurement positions of the plate thickness and the propagation time are the same. There is an effect that it can be pressed with a constant pressing force by a spring.

〔The invention's effect〕

As described above, the present invention provides a linear gauge having a spindle that is pressed in a certain direction by a spring and that moves by expansion and contraction of the spring, and a plate thickness of an object to be measured according to a moving distance of the spindle that is connected to the linear gauge. A plate thickness calculation unit for calculation, an ultrasonic wave transmission / reception unit for transmitting / receiving ultrasonic waves to / from the probe, and a propagation time calculation unit for calculating the propagation time of the subject. With the sonic velocity measuring device having a sonic velocity calculating unit for simultaneously calculating the sonic velocity by simultaneously inputting the calculated plate thickness signal and the propagation time signal, it is possible to easily and quickly measure the sonic velocity of the subject. In addition, it has a practical effect of obtaining highly reliable measurement results.

[Brief description of drawings]

Each of the drawings is an explanatory view of an embodiment according to the present invention.
Figure is a front view of the device, Figure 2 is a bottom sectional view of the spindle,
FIG. 3 is a sectional view showing an example of the probe, and FIG. 4 is a sectional view of FIG.
FIG. 5 is a block diagram of the apparatus, which is an IV-IV blind sight diagram.

Claims (2)

[Claims] 1. An ultrasonic sound velocity measuring device for a subject, comprising a spindle that is pressed in a certain direction by a spring and that moves a certain distance by expansion and contraction of the spring, the subject being measured according to the moving distance of the spindle. A linear gauge connected to a plate thickness calculating unit for calculating the plate thickness, and a probe that is detachably attached to the tip of the spindle, and ultrasonic waves are transmitted to the probe and received by the probe. Of the ultrasonic wave transmitting / receiving unit for receiving the reflected wave from the ultrasonic wave transmitting / receiving unit, the propagation time calculating unit connected to the ultrasonic wave transmitting / receiving unit for calculating the propagation time of the subject, and the plate thickness signal and the propagation time calculating unit of the plate thickness calculating unit. A sound velocity measuring device for ultrasonic waves in a subject, comprising: a sound velocity calculator for simultaneously inputting a propagation time signal and calculating a sound velocity. 2. The spindle has a hole formed in an axial center thereof,
The ultrasonic sound velocity measuring device for a subject according to claim 1, wherein a signal cable connected to the ultrasonic wave transmitting / receiving unit is inserted into the hole.