JPS5830661A - Ultrasonic see-through device - Google Patents

Abstract

PURPOSE:To grasp exactly the state of an object to be detected by displaying the distance between the object and a face that reflects ultrasonic waves and the state of the reflecting face as brightness for one and as hue for the other. CONSTITUTION:A plurality of transducers are made to scan by means of a scanning means 101 and to the transducers a driving voltage is applied by a driving means 102 to send ultrasonic signals to an object to be detected from each transducer and at the same time to output position signals (d) from the scanning means 101. When echo signals are outputted from the transducers, their peak values are converted to brightness signals (b) by means of a brightness signal coversion means 103. Furthermore, the time required until the echo signals go over a specified threshold value is converted into color signals (d) by color signal conversion means 104. Based on the position signals, brightness signals and color signals pictures with variation in brightness and hue are displayed on a picture display means 105.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic fluoroscope suitable for inspecting the inside of a reactor vessel of a fast breeder reactor. (liquid) 9
Since the liquid metal is opaque, it is not possible to inspect the inside of the reactor vessel by direct visual inspection. Figure 1 shows a conventional ultrasonic fluoroscope, in which multiple ultrasonic transformers were used.
A scanning arm 1 with Tw till is arranged horizontally in a reactor vessel z of, for example, a fast breeder reactor to be inspected.
1 Each ultrasonic transformer is rotated at one end around the center by a driver @S 1) 3--Nate.

T8. ...The position of T1 is detected by the position detection circuit 4,
The control circuit 5 receives the next position signal output from the position detection circuit 4 and sub-controls the drive circuit gt of the drive mechanism 3, and the pulse oscillation circuit r connects each ultrasonic transducer through the switching circuit 8t. , e T, #...T1
A high voltage pulse is applied to each transducer.
T! s...Tut - 0 that is driven sequentially, that is, the ultrasonic signals transmitted from each transducer pass through the liquid metal in the reactor vessel 2 and detect objects B such as in-reactor equipment and core components. It is reflected from the table m (ultrasonic reflecting surface) and received by an arbitrary transducer n, and is output as an echo signal from the F transgenie. Meanwhile, each transgenie f T t -te,...Tn Any echo signal among the echo signals output from the echo signal is applied to the peak value detection circuit 10 through the gate circuit #, and the peak value of the 32 echo signal detected by the peak value detection circuit 10 is applied to the luminance signal conversion circuit. The output of the position detection circuit 4 is converted into a predetermined luminance signal. Based on this, a JJK fluoroscopic image is displayed on the CRT display, and from this iiiiiigl, it is possible to know the state of the detected objects l such as internal equipment and core components in the reactor vessel 2.

By the way, the peak value of the echo signal detected by the peak value detection circuit 10 is determined when the density of all the liquid particles is uniform. distance (hereinafter referred to as the reflecting surface distance) ■ Inclination, surface roughness, and other surface conditions of the ultrasonic reflecting surface m<
(hereinafter referred to as the reflective surface state) 0, that is, the perspective image based on the peak value obtained by sweeping is the above-mentioned (2).

Information tube superimposition of (2) The brightness of the perspective image decreases when the reflective surface is far away or when the ultrasonic reflective surface is tilted, so the brightness decreases. It was not possible to determine whether the problem was caused by the cause of the problem, and it was not possible to accurately grasp the state of the detected object B.

The present invention was made based on these circumstances.
Its purpose is to use ultrasonic waves to see through the position and shape of an object (object to be detected) that cannot be directly seen inside a container filled with opaque liquid and display the image. In the apparatus, the distance from the ultrasonic transducer to the ultrasonic reflecting surface of the object to be detected and the surface condition of the ultrasonic reflecting surface are displayed as separate information on the same screen, and - the condition of the object to be detected at - To enable accurate grasping. In other words, the ultrasonic fluoroscope according to the present invention, as shown in FIG. Apply the full driving voltage to the ultrasonic transducer and turn each transducer into
The scanning means 101 outputs a position signal corresponding to the position of each transducer, and the ultrasonic signal reflected from the detected object is transmitted to an arbitrary ultrasonic transformer. When an echo signal received by Genie T is output from its ultrasonic transducer, the luminance signal converting means 103 detects the peak value of the echo signal and converts the peak value into a predetermined luminance signal. Then, a drive signal is applied to each ultrasonic transducer, and the echo signal output from the rLx and O transducer exceeds the predetermined threshold level A/. 704 and converts the eco-hour into a color signal, and outputs a position signal outputted from the scanning means 101, a luminance signal outputted from the luminance signal conversion means 103, and the color signal conversion means 1#4. The image display means 1-8 is configured to display all changes in brightness and hue based on the color signals obtained.

Therefore, according to the ultrasonic fluoroscopy apparatus according to the present invention, the position and shape of objects to be detected, such as reactor internal equipment and core components filled with liquid metal, can be displayed in detail. Moreover, the difference in the distance between the reflective surfaces can be displayed on the same screen as, for example, a difference in brightness, and the difference in the state of the reflective surface as a difference in tube hue. Differences can be clearly distinguished, and the state of the object to be detected can thereby be accurately grasped.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

Note that the same parts as in FIG. 1 will be described with the same reference numerals.
, TI,...Tnt-mounting is configured so that the next scanning arm 1 is rotationally driven around one end by the drive mechanism 3, and for each transducer, the scanning arm 1 is rotated by the driving mechanism 3.
- The position of Tn is detected by the position detection circuit 4, and the position detection circuit 4 outputs a position signal to the control circuit 5, and the control circuit I controls the drive circuit l of the drive mechanism S based on the position signal. It is configured as follows. The scanning arm I is arranged horizontally in the reactor vessel 2 of the fast breeder reactor, and is immersed in the liquid metal A in the reactor vessel I11.

The driving means 102 generates each ultrasonic transgenie fTsaTzs from the pulse generation circuit 1 via the switching circuit 8.
...A high voltage pulse is applied to Tn to generate each transgenie, T1. . . . Tn is sequentially operated, and each transducer is configured to transmit an ultrasonic signal toward the object B to be detected.

The luminance signal conversion means JOB converts each ultrasonic transformer t) knee fT1 aT1. . . . An arbitrary signal among the echo signals outputted from rL, in is applied to the peak value detection circuit 1# through the gate circuit g, and the peak ( 11, and is configured to be output to the luminance signal conversion circuit 15 via a peak value/distance correction circuit 14t consisting of an arithmetic comparison circuit such as a microcomputer.

Further, the color signal conversion means 104 converts any signal t out of the echo signals outputted from each ultrasonic transgenie unit 1*T1m...Tm to a comparison circuit through a gate circuit 9t.
-1m1g-1e'...1g-r.

and compares it with a different threshold level for each comparison circuit. Circle, each comparison circuit J 6-1, 1
The clock circuit 111L reclock pulse tube applies 0 to the n counter circuits 11□jJF-, . ,.

. . 11-m, a high voltage pulse is applied from the pulse generating circuit r to the ultrasonic transducers TlsTms .

At 1g-, . . . 16-rn, O σ pulses are counted until the echo signal exceeds the threshold VW level lL/wo, and each counter circuit 111゜1r-1m.
・・The output of IF- is applied to the eco one-hour detection circuit 19. Then, in this eco one-hour detection circuit 19, when the high voltage signal is applied, the echo signal is counted until it exceeds the highest threshold level. Value (eco one hour)
The count value is applied to the color signal conversion circuit 2o to convert it into a color signal of red, orange, etc. according to the count value. The count value (eco one hour) detected by the peak value/distance correction circuit 1
In the n1 peak value/distance correction circuit 14, the peak value of the echo signal inputted from the peak value detection circuit 10 is transmitted to the n1 peak value/distance correction circuit 14.

T1. ...the distance from T1 to the ultrasonic reflecting surface of the detected object B).

li health display means pal', ultrasonic transducer T@@Tl #...τ from the position detection circuit 4;
The position signal of n, the luminance signal from the luminance signal fold switching circuit 15, and the color signal from the color signal conversion circuit j# are input to a signal processing circuit jJK and processed as an image signal. -C
The R display 22 is configured to display the reflective surface distance distribution in brightness and also to display the eco hourly distribution, that is, the reflective surface state by hue.

Note that the eco-hour detection in the color signal converting means 10, 4 is performed, for example, as shown in FIG. That is, using the four comparison circuits IC-1 to IC-16-, the threshold level f: 8HI to IHJ in each comparison circuit is
And each ultrasonic transgenie fTr-T! ,...
After the driving voltage is applied to Tm, the count value teco required for the echo signal to exceed the highest threshold level is one hour.

Next, the detection of the echo hour is not limited to the above method; for example, the echo signal is digitally recorded using a waveform memory, and the peak value and peak value are recorded using a microcomputer-based calculation/comparison circuit. The distance correction of the peak value in the 11th order peak value/distance correction circuit 14 may be performed as shown in FIG. Figure 5 shows the relationship between the reflective surface distance (i.e. echo hour) and the peak value of the echo signal. , the echo signal, and ET are echo signals without distance correction.0 With the above configuration, on the color CRi display JJ, the state of the reflective surface of the detected object 10 is displayed in brightness, and the distance of the reflective surface is displayed in hue. Therefore, the position of the object to be detected, the surface inclination 1+, the surface roughness, etc. can be accurately grasped, and the desired effect can be achieved. In the above embodiments, the reflective surface mt luminance is displayed. Although the description has been made assuming that the hue is displayed based on the distance between the reflective surfaces, it is of course possible to reverse this.

As detailed above, according to the present invention, the distance from the ultrasonic transducer to the ultrasonic reflecting surface of the object to be detected;
By displaying the surface condition of the ultrasonic reflecting surface on the same screen, one as luminance and the other as hue, it is possible to accurately grasp the condition of the object to be detected, and it is possible to accurately grasp the condition of the detected object. In-reactor equipment and core configuration! ! There is one that can provide an ultrasonic fluoroscope suitable for detecting elements.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional example, Fig. 2 is a block diagram showing the configuration of the present invention, Fig. 3 is a block diagram showing an embodiment of the present invention, and Fig. 4 is a color signal conversion in the same embodiment. A waveform diagram showing the echo one-hour detection operation of the means, and Fig. 5 is a waveform diagram showing the peak value/distance correction operation in the same embodiment. The graph diagram (6) is a block diagram. ...Detected object, 101...Scanning means, 10
2... Drive means, 103... Luminance signal conversion means, 1
04... Color signal conversion means, 105... Image display means 0

Claims (2)

[Claims] (1) A scanning means for scanning multiple OSS sonic transgenies together and outputting a position signal tube according to the position of the transgenies, etc.; A driving means for transmitting an ultrasonic signal from a transducer toward an object to be detected, and an ultrasonic signal reflected from the object to be detected is received by an arbitrary ultrasonic transducer and the ultrasonic transducer is used. - luminance signal converting means for detecting the echo signal O beater value when an echo signal is output from the channel fL* and converting the peak value into a predetermined luminance signal and outputting the same; is applied, and the echo signal output from the transducer reaches the lower level of a predetermined O threshold.Detects the echo time, converts the echo time into a color signal, and outputs the color signal. An ultrasound system comprising: a converting means; and an image display means for receiving the outputs of the scanning means, the luminance signal converting means, and the color signal converting means and displaying the image tube with changes in luminance and color IIO; Fluoroscopy device. (2) The front color signal conversion means includes a plurality of comparison circuits that compare the peak values of the echo signals of the ultrasonic transducers obtained by the luminance signal conversion means with different thread VW LED repels; After the driving voltage is applied to the transformer 9 & -, an echo signal is echoed in each comparator circuit by a plurality of counters counting the time required and the output of the nbO counter circuit. An eco one hour detection circuit that detects one nib hour required for the signal to exceed the highest threshold level, a color signal conversion circuit that converts the echo signal output from the eco one hour detection circuit into a color signal, and a color signal conversion circuit that converts the echo signal output from the eco one hour detection circuit into a color signal (3) An ultrasonic fluoroscopy device opening (3) according to claim (1) comprising: t'L7t detected by the color signal converting means;
The scope of the patent outcome is characterized in that the luminance signal converting means corrects the attenuation of the peak value of the echo signal with respect to the distance from each ultrasonic transducer to the object to be detected, based on the echo time. The ultrasonic fluoroscopy device according to item (1).