JPS63222228A - Apparatus for measuring propagation velocity of ultrasonic wave in object to be inspected - Google Patents

Abstract

PURPOSE:To easily measure the sonic velocity of an object to be inspected within a short time, by mounting a probe to the head of a movable spindle and providing a linear gauge measuring the moving distance of the spindle. CONSTITUTION:At first, a probe 9 is directly brought into contact with a surface plate 9 in such a state that there is no object 10 to be inspected on the surface plate 9 and an order of a plate thickness zero dimension is given to the plate thickness operation part connected to a linear gauge 5 in this state. Next, a spindle 7 is moved upwardly and the signal of a moving distance of the spindle 7 is sent to the aforementioned plate thickness operation part in such a state that the probe 8 is directly brought into contact with the object 10 to be inspected inserted between the probe 8 and the surface plate 9 to operate the thickness T of the object 10 to be inspected. In this state, an ultrasonic wave is transmitted to the probe 8 and the reflected wave from the object 10 to be inspected is received through the probe 8 to calculate a propagation time. Sonic velocity is calculated from the thickness T and the propagation time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for measuring the speed of sound of ultrasonic waves in a subject, and particularly to a device suitable for easily measuring the speed of sound in a short time.

Note that the analyte here refers to a solid.

[Conventional technology]

Conventionally, a simple method of measuring the sound velocity of an object using a normal ultrasonic flaw detector using a pulse reflection method is widely used. This means that existing ultrasonic flaw detectors can be used to measure the speed of sound, and the measurement is straightforward, and it also has a certain level of measurement accuracy for the speed of sound required for ultrasonic flaw detection, for example, 1%.
This is because accuracy within a certain degree of error can be obtained. However, the calculation of the sound speed in this measurement method is generally (in the case of the -probe method) using the following formula T t where V = sound speed (m/5ee) T = thickness of the specimen (m) t = propagation of ultrasonic waves Since the measurement takes time (sec), it is necessary to measure the thickness T of the object.

The measurements of the plates w and T have conventionally been performed using a micrometer, calipers, etc., and are performed in a separate process from 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 B1 and the second bottom echo Bz of the object displayed on a CRT such as an ultrasonic flaw detector, or the time between the second bottom echo B2 and the second bottom echo Bz. The time between the three backplane echoes B, is read and the memorized or recorded value is used.

Conventionally, the plate thickness T and the propagation time t are determined separately and the sound velocity is calculated using the above formula, so calculating the sound velocity always requires two or more steps. It is easy to deviate from the time measurement position, and the measurement result (t
There were problems in that the $1 value was lowered and measurement was laborious and took a lot of time.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional sound velocity measurement of a test object, the thickness of the test object and the propagation time necessary for calculating the sound speed were determined in separate processes, which required a lot of time and effort, and the reliability of the measurement results was low. However, this method had the problem of easily causing a decrease in performance.

The present invention solves the problems of the prior art described above, and aims to provide a sound speed measuring device that can measure the sound speed of a subject easily and in a short time, and can provide reliable measurement results. purpose.

[Means for solving problems]

The present invention provides a linear gauge having a spindle that is pressed in a certain direction by a spring and moves a certain distance by the expansion and contraction of the spring, and a linear gauge that is connected to the linear gauge and calculates the thickness of the object based on the moving distance of the spindle. a plate thickness calculation unit; and an ultrasonic transceiver unit that attaches a probe to the tip of the spindle in a detachable manner, transmits ultrasonic waves to the probe, and receives reflected waves from the object received by the probe. , a propagation time calculation unit connected to the ultrasonic transmitting/receiving unit and calculating the propagation time of the object, and simultaneously inputting the plate thickness signal of the plate thickness calculation unit and the propagation time signal of the propagation time calculation unit to calculate the sound speed. By using an ultrasonic sound velocity measurement device for an object to be examined, which is equipped with a sound velocity calculation section that allows the sound speed of an object to be measured easily and in a short time, it is possible to obtain highly reliable measurement results. be.

[Effect]

A probe is attached to the tip of a spindle, which is incorporated into a linear gauge and is always pressed in a fixed direction by a spring, so that it can be worn under the skin. The spindle is moved a certain distance by expanding and contracting the spring by an external force. First, the probe is directly probed with the surface of the surface plate on which the test object is set, and the plate thickness calculation section, which is connected to a linear gauge and calculates the plate thickness by receiving signals from the linear gauge, is Give instructions. Next, the measurer shortens the spring to move the spindle, inserts the object into the gap created by the movement between the probe and the surface plate, and sets it on the surface plate. In this case, when the linear gauge is held by the holding member in the position where the spring is shortened, the spindle is pressed toward the subject by the compressive force of the spring, and the probe presses against the subject with a constant force. In this state, the plate thickness of the object to be examined is immediately calculated by sending a signal indicating the moving distance of the spindle to the plate thickness calculating section. On the other hand, in the same state as above, the ultrasonic wave transmitting/receiving section transmits ultrasonic waves to the probe, and the reflected waves from the subject are received by the ultrasonic transmitting/receiving section via the probe.

This received signal is sent to a propagation time calculating section connected to the ultrasonic transmitting/receiving section, and the propagation time is calculated simultaneously in parallel with the calculation of the plate thickness. Information on the calculated propagation time and the plate thickness is simultaneously input to a sound speed calculating section, and the sound speed is calculated.

For a new test object with a different plate thickness, the sound speed can be measured in the same way as above, just by changing the spindle travel distance, but if the test object has different physical properties such as material and specific gravity, Since the probe is removable, measurements are performed by replacing the probe with one suitable for the subject being examined.

〔Example〕

Embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a front view of the device 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 the probe, and FIG. The perspective view, FIG. 5, is a block diagram of the apparatus. In the figure, 1 is a stand, 2 is a pole set up on the stand 1, and 3 is a guide arm that can be moved up and down along the pole 2. It has a hole 3a with a hole 3a and a hole 3b with an interruption that supports the linear gauge 5 and fits into a part thereof. The guide arm 3 is installed in the cut-in part of the hole 3a.
A knob 4 for locking the linear gauge 5 to the guide arm 3 is attached to the pole 2 at an arbitrary height position 1, and a knob 6 for locking the linear gauge 5 to the guide arm 3 is attached to the cut-in portion of the hole 3b. Reference numeral 7 denotes a spindle built into the linear gauge 5, which is constantly pushed downward by a compression spring (not shown) inside the linear gauge 5, and the spring is expanded and contracted by an external force (in this example, by the measurer). This allows it to be moved a certain distance. A probe 8 is attached to the lower end of the spindle 7.
As shown in FIG. 2, the removable part is formed with a diameter that allows it to fit into the housing 16 of the probe 8 without any play, so that both can be easily connected when fitted. A guide bin 18 is provided that extends beyond the diameter so as not to come off. A hole 7a is bored in the axial center, and a female connector 19 into which the connector 17 of the probe 8 is inserted is provided at the end of the hole 7a. The probe 8 includes a vibrator 14 and a damper 15 in a housing 16, and a hole 8 into which the spindle 7 is fitted at one end of the housing 16.
a, and a front plate 13 is provided on the outer surface of the vibrator 14 at the other end.
are provided respectively. A guide pin 1 is attached to the outer periphery of the hole 8a.
A recess 8b into which the resonator 8 is fitted is provided, and a plug 17, which is an outlet for the signal line from the vibrator 14, is provided in 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. 20 is subject 1
This is a calculating section for a plate thickness T of 0, which has a function of issuing a zero plate thickness command, and is connected to a linear gauge 5 by a cable 11. 2
Reference numeral 1 denotes an ultrasonic 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 connected by a signal line passing through the hole 7a of the spindle 7 and a cable 12. ing. Reference numeral 22 denotes a propagation time calculation unit that is connected to the ultrasound transmission/reception unit 21 and calculates the propagation time of the ultrasound in the subject 10 based on the transmitted signal. Reference numeral 23 denotes a sound velocity calculation unit that simultaneously inputs the plate thickness signal from the plate thickness calculation unit 20 and the propagation time signal from the propagation time calculation unit 22 to calculate the speed of sound.

Next, the operation of the device will be explained. First, with no subject lO on the surface plate 9, loosen the knob 4 and move the guide arm 3 to the linear gauge 5. The front plate 13 of the probe 8 is brought into direct contact with the surface plate 9 by lowering it together with the probe 8 and the like, and the plate thickness calculating section 20
Give the zero thickness dimension command to . Next, a compression spring (not shown) pushing the spindle 7 downward is shortened to move the spindle 7 upward. Then, the subject 10 is inserted and set in the gap between the front plate 13 and the surface plate 9 created by the movement. Since the spindle 7 is constantly pressed downward by the compression spring, the probe 8 attached to the lower end of the spindle 7 is in a state of pressing 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 state, the ultrasound transmitting/receiving section 21 transmits ultrasound to the probe 8, and the reflected wave from the subject 10 is received by the ultrasound transmitting/receiving section 21 via the probe 8. This received signal is sent to the propagation time calculation section 22,
In parallel with the calculation of the plate thickness T, the propagation time is calculated at the same time. The information on the calculated propagation time and the plate thickness is simultaneously input to the sound speed calculating section 23, and the sound speed is immediately calculated by simply bringing the probe 8 into contact with the object 10.

When the thickness of the object 10 to be measured is different, the moving distance of the spindle 7 is different, and the thickness calculation unit 20 calculates a different thickness, and the propagation time calculation unit 22 calculates a different propagation time, and the process is similar to the above. The speed of sound is measured. In addition, if the material and physical property values such as specific gravity of the object 10 are different, it is possible to change the probe suitable for the object and measure it. Specific gravity measurements can also be performed.

In this way, the speed of sound can be measured simply by bringing the probe 8 into contact with the object 10, and the measurement is carried out at the same measurement position for the plate thickness and propagation time without any positional deviation. The spring has the effect that a certain amount of pressing can be performed by pressing with force.

〔Effect of the invention〕

As explained above, the present invention includes a linear gauge having a spindle that is pressed in a certain direction by a spring and moves by the expansion and contraction of the spring, and a linear gauge that is connected to the linear gauge and measures the plate thickness of the specimen by the moving distance of the spindle. a plate thickness calculating section for calculating; a probe detachably attached to the tip of the spindle; an ultrasonic transmitting/receiving section for transmitting and receiving ultrasonic waves to and from the probe; and a propagation time calculating section for calculating the propagation time of the object. and a sound speed calculation unit that calculates the sound speed by simultaneously inputting the calculated plate thickness signal and propagation time signal, so the sound speed of the object can be measured easily and in a short time.
Moreover, it has the practical effect of providing highly reliable measurement results.

[Brief explanation of the drawing]

The drawings are all explanatory diagrams of embodiments according to the present invention, and the first
The figure is a front view of the device, the second figure is a sectional view of the lower part of the spindle,
FIG. 3 is a sectional view showing one example of the probe, FIG. 4 is an IV-IV blind view of FIG. 1, and FIG. 5 is a block diagram of the device.

Claims (1)

[Scope of Claims] 1. An ultrasonic sound velocity measurement device in a subject, which includes a spindle that is pressed in a certain direction by a spring and moves a certain distance by the expansion and contraction of the spring, and the movement distance of the spindle. A linear gauge is connected to a thickness calculation unit that calculates the thickness of the object to be examined, and a probe is removably attached to the tip of the spindle, and ultrasonic waves are transmitted to the probe and received by the probe. an ultrasonic transmitter/receiver that receives reflected waves from the object to be examined; a propagation time calculator connected to the ultrasonic transmitter/receiver and calculates the propagation time of the object; and a plate thickness signal and propagation time of the plate thickness calculator. 1. An ultrasonic sound speed measurement device in a subject, comprising a sound speed calculation unit that simultaneously inputs a propagation time signal of the calculation unit and calculates the sound speed. 2. Ultrasonic waves in a subject according to claim 1, wherein the spindle has a hole bored in its axial center, and a signal cable connected to the ultrasonic transmitter/receiver is inserted into the hole. Sound speed measuring device.