JPS613058A - Probe position detector for ultrasonic measuring apparatus - Google Patents

Abstract

PURPOSE:To enable automatic measurement of the coordinate position of a probe on a test piece, by mounting a mobile body provided with a probe at the tip thereof fixably at a desired position on the test piece to compute displacement thereof from the reference position. CONSTITUTION:In an ultrasonic measuring apparatus which measures internal condition such as internal defect and facial pressure of a test piece 4 utilizing an ultrasonic wave, a rotor 7 is arranged rotatably on the top of a base 5 fixable at a desired position on the test piece 4 with a magnet or the like and a rod 12 is fitted slidably into the rotor 7. A probe 2 is mounted on the rod 12 in such a manner as to be movable vertically and rotatable horizontally. The rotation of the rotor 7 is transmitted to the first rotary encoder 6 through a support 9 and a gear 8 while the linear displacement of the rod 12 is detected with the second rotary encoder 11. Then, a signal outputted from rotary encoders 6 and 11 is fetched into a processor to be computed by the specified formula thereby determining the coordinate position of the probe 2 on the test piece 4.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an ultra-IF wave measuring instrument that uses ultrasonic waves to measure internal defects and internal conditions of surface pressure in a test specimen, and particularly relates to an ultrasonic wave measuring instrument that uses ultrasonic waves. Automatically VC the position of the projected probe relative to the test object
The present invention relates to a probe position-' detection device for an ultra-IF wave measuring instrument.

[Background of the invention]

Conventionally, as a method of measuring internal conditions such as internal defects and internal surface pressure of a test specimen, ultrasonic waves are projected from a probe into the inside of the test specimen, and the reflection of this ultrasonic wave is detected again. There is an ultrasonic measuring device that can detect 5Kt at a distance.

Fig. 9 is a schematic external view of a conventional ultrasonic meter, in which 1 is a main body having an oscilloscope cathode ray tube, various knob switches, etc., and 2 is a probe that transmits and receives ultrasonic waves. 3 is a cord connecting the main body 1 and the probe 2;
The main body 1 is equipped with a known DC 1L pulser, an amplifier, etc. (not shown), and the probe 2 is equipped with a known DC electromagnet, a transmitting/receiving coil, etc. (not shown).

FIG. 10 is an external view showing an example of how such an ultrasonic side device is used, and 4 is a test specimen. As shown in FIG. 10, the predetermined position of the test specimen 4.

For example, place the aforementioned probe 2 at the position indicated by arrow A,
In this state, ultrasonic waves are input from the probe 2 into the inside of the test object 4, and the amount of reflected echoes reflected by the ultrasonic waves from internal defects or the bottom surface of the test object 4 is received again by the probe 2. The presence or absence of internal defects and their depth in the 40 test specimens will be determined. Similarly, the arrow mouth of test specimen 4,
The probe 2 is also placed in the position indicated by ・ to measure the presence or absence of an internal defect and its depth at the position ・.

By the way, in order to examine the reliability of test specimen 4 as a product, it goes without saying that test specimen 4 should be measured with 4X sauce.
Measured values obtained at each Qlli localization instant and each 111
11 It is necessary to examine the correlation lSl with the stereotactic test and the distribution of internal defects in the test specimen 4.

Therefore, in the past, each measurement position was marked with paint, etc., and when the measurement was completed, each measurement position was marked with 1-, A, 口, C...
- The length of the probe 2 was measured, and the measurement position of the probe 2 with respect to the test object 4 was determined from this measurement 111.

However, in this conventional method, when determining the coordinate position of the probe 2 with respect to the test object 4, it is necessary to mark the measurement position of the test object 4 with WK paint, etc., and to mark the marked measurement position. The disadvantage is that the work process becomes complicated, as it requires the work of measuring the length between the four points with a measuring tape, etc., and the work of calculating the coordinate position of each measurement position with respect to the test specimen 4 from the measured length between the measured points. was there.

[Purpose of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a probe position detection device for an ultrasonic measuring instrument that can automatically measure the coordinate position of a probe on a test object, while eliminating the drawbacks of the prior art described above.

[Cost of invention]

In order to achieve this object, the present invention includes a base that can be placed at any position on a test specimen, a base that is movably supported by the base, and a probe provided at the tip. with a movable body.

and a displacement detection means capable of detecting the moving layer of the movable body,
The present invention is characterized in that the coordinate position of the probe on the test object is determined by calculating the amount of displacement of the n1 moving object from the reference position.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 shows probe position detection of the ultrasonic measuring instrument according to the present invention @
FIG. 2 is a plan view showing the first embodiment of the device; FIG. It is an external view showing the probe attachment part of the probe position detection device of the ultrasonic measuring instrument shown in the figure, and the parts corresponding to FIGS. 9 and 10 are marked with K)S4-.

In these figures, reference numeral 5 indicates a rotating body rotatably disposed on the upper part of the base 5, 8 indicates a gear connected to the rotating body 7 via a support shaft 9, and 10 indicates an arbitrary position on the test specimen 4. is a bearing that supports the support shaft 9, and the amount of rotation of the rotating body 7 in the direction of arrow C is transmitted to the first rotary encoder 6 via the support shaft 9 and the gear 8. 11 is a second rotary encoder disposed inside the rotating body 7; 12 is a rod that is movably fitted to the rotating body 7; The rotational displacement is converted by the rotary encoder 11, and the stroke displacement amount of the rod 12 is detected by the 20th rotary encoder 11. 2 is the aforementioned probe, 13 is an operating rod fixed to the probe 2, and the operating rod 13 is connected to the hole +2 provided at the tip of the rod 12.
a The I/C is slidably fitted, so that the probe 2 is attached to the rod 12 so that it can move vertically and rotate horizontally.

FIG. 4 shows the first and second rotary encoders 6.
．． 11 is a block diagram showing an example of a processing device 14 that receives signals output from the probe 11 and calculates the coordinate position of the probe 2. FIG. As shown in FIG. 4, the processing device 14 is, for example, a microcomputer (H configuration), which inputs signals from the first rotary encoder 6 and the second rotary encoder 11, switches between them, and outputs the signals. Multiplexer 1
4 a and a central processing unit g (cp) that performs various calculation processes.
U) 14b, RAM memory 14c for temporarily storing data etc. during calculation, and Act 11? - Output device 14 that outputs the coordinate position obtained by
d.

Next, the principle of calculating the coordinate position of the probe 2 will be explained based on FIG. Note that in FIG. 5, point 0 indicates the center of rotation of the rotating body 7 when it rotates on the base 5, that is, the position of the support shaft 9.

First, in order to determine the detection coordinate plane (X-Y plane) of the probe 2, point A, which is the origin (0,0), and point B, which is an arbitrary point in the X direction, are given in advance (i.e. , the length of the rod 12 when point A is specified is determined by the second rotary encoder 11.
Similarly, the length of the rod 12 when the KB point is rectangular is detected by the rotary encoder 11 and the length is set as b. The angle is detected by the first rotary encoder 6 and is defined as α. Given these a, b, and α, the distance between points A and B is T3 as follows: 7Vg = , /a2+ b' -2a b a c
osα... is found as ■, and when AB is found, is found.

Now, the probe 2 is at any point PVC, Yang Kai, from 0 point to P
The length p to A is obtained by detecting the length of the rod 12 with the second rotary encoder 11, and
The angle β between the point and the point P with respect to the zero point, ie, LAOP, can also be determined by detecting the amount of rotation of the rod 12 with the first rotary encoder 6. When these p and β are given, do the same as above.

Shoulder = 5 houses〒[Tη■; 7...■ is calculated, and using ■ and the 0 formula, LPAB = LOAP-40AB Conflict ・
・ Φ ■ is required. From the above, if the coordinates of point P are Px and Py, respectively, Px = KV x cos (L P A B )P from formulas ■ and ■.
y=APXsin(Z-PAB) is determined. Such arithmetic processing is performed by the processing device 14VC described above, and the processing device 14 displays the coordinate position of an arbitrary point on the probe 2 on the display device 15.

Or print out the coordinate position.

In addition, in the first embodiment described above, the rod 12 for linear displacement of the probe 2 and the potentiometer 16 that is the 20th rotor, and the piano forest 17 that connects the potentiometer 16 and the probe 2 are used. In this case, K may be configured to constitute a means for detecting displacement of the probe 2 in the linear direction. Also, regarding the detection of the rotary body 7 as a rotating shaft, the tenth rotary encoder 6
A rotary potentiometer or the like may be used instead of zero.

FIG. 7 is a plan view showing another embodiment of the probe position detection device for an ultrasonic meter according to the present invention, and the parts corresponding to FIG. -I am.

In this FIG. 7, reference numeral 18.19 is a link whose length is known in advance, and one end of the link 18 is rotated on the base 5 by a pin 20. [4] One end of another link 19 is connected by the pin 2111C, and the probe 2 is attached to the end of the link 19 so as to be movable up and down and rotatable, as in the first embodiment described above. I'm being kicked. Further, although not shown, a means capable of detecting the angle of the link 18 with respect to the base 5, such as a rotary encoder, is provided inside the base 5. A rotary encoder (not shown), etc., which can detect the angle formed by the thigh link]8°19 is provided.

In this embodiment, the calculation source f! of the coordinate position of the probe 20!
I! is as follows. That is, in FIG.
The center of rotation when the link 18 rotates on the base 5 is 0 point,
The connecting point of both links 18 and 19 is point A, the tip of link 19, that is, the position of probe 2 is point B, the length of link 18 is a (=σl), and the length of link 19 is b (= 7VR ;
), the angle between link 18 and link 19 is γ(-L
OAB).

Since a, b, and γ1@chair are all known or can be detected, first give point B, which is the origin (0,0) of the X-Y plane, and obtain OB=a"+b"-2abecosr asss
- Find ■.

Next, move link 18.19 to any point B in the X direction so that KvA point becomes A' point, B point becomes B' point, and r becomes γ'.
'Give the point, OB' := a"+b"-2ab*cosr'
Find *e #II #■. Here, if the angle formed by link 18 when point B, which is the origin, is specified and link 18 when point B' is specified is δ(-4AQA'), then δ can be detected by the angle detection means. From, and δ and ■, ■ equation, LBO-B'=δ0ZA'Of3/ -LA OB
−・−■ is required, and from this busy “100’= (OB)”+(OB’)”−2COB)・(
UB')-cos(tBOB')...0 is obtained.

In this way, with point B serving as the origin and arbitrary point B' in the X direction given in advance, the probe 2 can be moved to an arbitrary point PK in the X-Y direction.
When moving, point A moves to point A', point B moves to point P, r becomes γ', and δ becomes δ'. Since both rN and δ' can be detected, they are on the same plane.
”...O is required.

LBOP= δ'+ lA'0F-fAOB
, - Fist @■= (OT3 doors + (σP)'-2(
σ-B)(0)')-cos(tBOP)...@ is calculated. In this 00 formula, OB%OP.

Since BP has already been calculated using the 01010 formula, ■
LB/BP-LOBP-1OBB' ---9 can be obtained from the equation 0. From the above, the coordinates of point P are P, , P
If F, then 5Px = B P Xcos (LB'B P ) and y from ■ and formula 0.
=BPXsin(LB'BP) is obtained. Such arithmetic processing is also performed by the processing device 14 shown in FIG. 4, as in the first embodiment described above, and the processing device 14 displays an arbitrary coordinate position of the probe 2 on the display device 15, Or print it out.

In addition, in each of the above-mentioned examples, the base 5 is used as the test body 4.
Although a method using a magnet has been described as a means for fixing the titK to an arbitrary position, other fixing handles such as a suction cup or a vise may be used instead of the magnet.

〔Effect of the invention〕

As explained above, according to the present invention, the coordinate position 1d of the probe on the test object can be automatically determined,
Therefore, when the internal state at an arbitrary position of the test object measured by the probe and the current fA measurement position are respectively taken as data, the work process can be simplified compared to the conventional method.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of a probe position detection device for an ultrasonic measuring instrument using unexploded uA, and FIG. 2 is a plan view of the probe position detecting device for an ultrasonic measuring instrument shown in FIG. 3 is an external view showing the probe mounting part of the probe position detection device of the ultrasonic measuring instrument shown in FIG. 1, and FIG. 4 is a partial sectional view showing the displacement detection section. A block diagram showing an example of a processing device included in a probe position detection device of a sonic measuring instrument, Figure M5 is a principle diagram explaining the principle of calculation performed by the processing device shown in Figure 4, and Figure 6 is a diagram illustrating the principle of calculation performed by the processing device shown in Figure 4. FIG. 7 is a plan view showing still another embodiment of the probe position detection device for an ultrasonic measuring instrument according to the present invention; FIG. 8 is a principle diagram explaining the calculation principle in the probe position detection device white of the ultrasonic measuring instrument shown in FIG. 7, and FIG. 9 is an external view schematically showing the conventional ultrasonic measuring instrument. Part i. This figure is an external view showing how the ultrasonic measuring instrument shown in FIG. 9 is used. 2...Probe, 4...Test specimen, 5...
... Base, 6゜11 ... Rotary encoder (displacement detection means), 12 ... Rod, 14 ...
...processing device, 16...potency meter (displacement detector 37), 17...piano wire, 18
．． 19...Link. Figure 1 Figure 2 Figure 3 Figure 4 Figure 7 Figure 8 Figure 9 Figure 1O

Claims (1)

[Claims] An ultrasonic measuring instrument that is equipped with a probe capable of projecting ultrasonic waves onto a test object and measures the internal state of the test object using ultrasonic waves, comprising: a base that can be fixed to any position on the test object; ,
A movable body movably supported by the base and having the probe at its tip, and a displacement detection means capable of detecting the amount of movement of the movable body, the amount of displacement of the movable body from a reference position. 1. A probe position detection device for an ultrasonic measuring instrument, characterized in that the coordinate position of a probe on a test object is determined by calculating