CN1052791C - Automatic ultrasonic detecting and analytical instrument with program-control amplification - Google Patents
Automatic ultrasonic detecting and analytical instrument with program-control amplification Download PDFInfo
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- CN1052791C CN1052791C CN 94100903 CN94100903A CN1052791C CN 1052791 C CN1052791 C CN 1052791C CN 94100903 CN94100903 CN 94100903 CN 94100903 A CN94100903 A CN 94100903A CN 1052791 C CN1052791 C CN 1052791C
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Abstract
The present invention relates to an automatic ultrasonic detecting and analyzing instrument with the program control amplifying function. A program control amplifying and attenuating system with constant amplitude and adjustability for the received signals is realized. The automatic detection of the sound and the time can be accurately completed by a main software interpretation method, and then the detection precision and the detection efficiency can be greatly enhanced.
Description
The present invention relates to the automatic detection range of ultrasound wave, the method for automatic interpretation when particularly relating to realization sound on the supersonic reflectoscope.
In order to ensure building, water conservancy, construction quality such as traffic and national defence, the detection means and the evaluating basis of science are provided, need be to concrete, rock, timber, the physical characteristics of nonmetallic materials such as pottery detects, and concrete Structural Engineering is also needed to carry out the quality testing of non-breakage, at present, Ultrasonic Detection is a kind of comparatively ripe lossless detection method, and conventional supersonic reflectoscope generally is after the electric signal that receives is passed through fixing gain, adopt manual attenuator to decay, interpretation obtains the quantitative data of received signal by hand, the eighties latter stage occur be with micro-processor controlled (control system is Z80 series) ultrasound measuring instrument, it is foundation that its program control amplification system goes out the Mintrop wave signal with the energy interpretation, signal amplitude value after program control amplification is also uncertain, can not guarantee the consistance of first wave amplitude in the multi-point sampler process, in addition, in nonmetal Ultrasound Instrument automatically during sound in the pick-up unit, all be to adopt the wave shaping trigger theory, when low and slow or signal to noise ratio is low when Mintrop wave, accuracy of detection obviously reduces, even leading false triggering appears or ripple is lost in hysteresis, and artificial interpretation is subjected to interference from human factor and produces reading error, and it is not easy to operate, make detection efficiency low, this all will influence popularizing and promoting of this detection technique.
Purpose of the present invention, be exactly at the problems referred to above, succeed in developing a kind of novel intelligent Ultrasound Instrument, Applied Computer Techniques, the mode that adopts software and hardware to combine achieve a butt joint collection of letters constant amplitude and adjustable program control amplification and attenuation factor, and with the software interpretation is that main mode detects when finishing accurately automatically, and accuracy of detection and detection efficiency are improved greatly.
Implementation of the present invention is as follows, and on intelligentized ultrasound examination analyser, the automatic interpretation of duration of realization sound and wave amplitude is achieved with the method soft, that hardware combines, and this method is divided into following step:
1. be set in the control variable of identification decision Mintrop wave in the baseline ground unrest:
Value with the keyboard to set up software control parameter " baseline control line Wn " of instrument;
2. set the control variable of automatic ration control Mintrop wave wave amplitude: the value of using the keyboard to set up software control parameter " first wave amplitude control level Av " of instrument;
3. catch Mintrop wave:
The value of digitized signal sample amplitude pointwise and baseline control line Wn is compared, when the signal sample continuous length greater than the Wn value reaches specified length, regard as and capture Mintrop wave;
4. adjust first wave amplitude:
Automatically adjust the duty of amplifying attenuation network according to Mintrop wave crest sample amplitude value and Mintrop wave wave amplitude control level Av value comparative result, through automatically first wave amplitude being transferred to Av ± 1 size after the sampling repeatedly several times;
5. finish the automatic interpretation of wave amplitude:
Calculate Mintrop wave wave amplitude numerical value according to Mintrop wave crest sample spot amplitude and the program control value of magnification that amplifies attenuation network this moment, finish the automatic interpretation of wave amplitude;
6. finish the automatic interpretation of duration:
With returning the anti-true starting point C that method is determined Mintrop wave that pushes away, the automatic interpretation of duration is finished in the duration of calculating sound.
For making first wave amplitude is automatic constant amplitude and quantitative adjustable value, the present invention is provided with special parameters: " first wave amplitude control level (Av) " is 16 lattice of the vertical five equilibrium in screen waveform district, the mid point value is 0, value is ± 1～± 8 respectively up and down, with the number key assignments, as the control variable of automatic ration control first wave amplitude.
Interpretation was divided into for two steps during sound: (1) seeks the Mintrop wave position, and the present invention is provided with special parameters " baseline control line Wn line ", is the horizontal amplitude line that certain distance is arranged apart from horizontal base line E, and its spacing is regulated by " ↑ ", " ↓ " key of keyboard.(2) determine the true start position c of Mintrop wave, the decision method that c is ordered has two kinds, a) intersection points B with digitizing reception waveform and baseline control line is a starting point, point by point scanning is counter to be pushed away, find the intersection point of Mintrop wave and baseline E, be Mintrop wave starting point c, this method is applicable to that waveform is steady, baseline straightening, the signal to noise ratio conditions of higher is a starting point with the intersection points B point b), gets the fixed-length data sample and does the least square method linear regression, the promptly linear anti-intersection point c that releases Mintrop wave and baseline E, this method is applicable to that signal to noise ratio is low, and baseline fluctuation is big, the condition that the Mintrop wave starting point is not clear, being used for the closed loop of Mintrop wave differentiation and the automatic quantitative adjustable control of constant amplitude among the present invention, is by program control amplification and attenuation network, A/D high-speed signal acquisition plate, the PC computing machine, the I/O interface circuit is formed.
Further specify below in conjunction with drawings and the specific embodiments:
Description of drawings:
Fig. 1 is the fundamental diagram of automatic ultrasonic check and analysis instrument;
Fig. 2 is the brief block diagram of program control amplification software work;
The waveform synoptic diagram of decision method during wave sound headed by Fig. 3;
Fig. 4 (A), Fig. 4 (B) are the brief block diagram explanation of workflow.
Referring to Fig. 1, wherein (1) is high-voltage pulse stimulated emission circuit; (2) be driving voltage and excitation frequency programme control circut; (3) be codan; (4) be the I/O interface of computing machine and mimic channel; (5) be program control amplification and attenuation network; (6) be amplitude limiter circuit; (7) be the A/D collection plate; (8) be synchronizing circuit; (9) be transmitting transducer; (10) be measured body; (11) be receiving transducer; (12) be the PC/AT computing machine, (13) are keyboard specials; (14) be display; (15) be the drawing printer, the user sends signal by keyboard special, start high-voltage pulse generator, produce high-voltage pulse stimulated emission transducer, send ultrasound wave, import measured body into, be received the transducer reception and change electric signal into, after program control amplification and decay, send into the A/D plate, computing machine starts the A/D plate synchronously when starting radiating circuit, to receive electrical signal conversion is that digital signal is sent into PC/AT computing machine (being 386 main frames) herein, is gone the interpretation and the calculating of execution sound duration by the computer software of establishment in advance.
Adjustable program control amplification of constant amplitude of the present invention from the above and decay are by codan (3), I/O interface (4), program control amplification and attenuation network (5), amplitude limiter circuit (6), the closed loop that A/D sampling plate (7), PC/AT computing machine (12) are formed.The principal feature of native system is under the PC/AT control of microcomputer, and hardware combines with software, realizes the automatic constant amplitude control to first wave amplitude.Referring to Fig. 2, provided program control amplification software work brief block diagram, D is 8 program control amplification words.The system works principle is: receiving transducer receives electric signal and sends into program control amplification and attenuation network; this network is carried out current program control amplification word instruction; electric signal is amplified or decays; behind limiter protection circuit, send into the A/D sampling plate and be converted to digital signal; with dma mode input microcomputer host memory; computing machine adjusts program control amplification word D according to the difference of current sample amplitude A with expection range value (AV); the adjusted nearly program control amplification word instruction work of program control amplification attenuation network is through making first wave amplitude reach the expection amplitude very soon after repeatedly several times.The AV value is 1-8, vertical 256 picture elements of screen respectively are divided into 8 lattice up and down, every lattice are 16 picture elements, the AV value is provided with in the parameter menu by the user, the amplitude screen height of AV value representative is that the user requires the first wave amplitude expection to reach the amplitude controlled flag, program control amplification of the present invention is adjusted to the signal first wave amplitude in the scope of AV ± 1 automatically with the decay closed-loop system, signal dynamics amplitude range of control is 143db, screen digital signal amplitude resolution capability is counted, the amplitude range of control reaches 185db, and adjustable accuracy is 1db.
Another characteristics of native system are automatic detections of the Mintrop wave sound duration undertaken by software, it carries out a certain definite sample waveform sample, Chang Gui Ultrasound Instrument or have the intelligent Ultrasound Instrument of automatic sound transit-time measurement function in the past, no matter adopt wave shaping trigger theory or recurrent interval method of counting, they all are by opening the counting gate with the pulse signal that transmits synchronous, close calculating with the measured signal pulse, again the counter number of times is scaled duration, this method error is bigger, on the one hand cause leading erroneous judgement because of own ship's noise or external interference easily, because of causing to lag behind at a low speed, first wave amplitude loses ripple easily on the other hand, and when sound automatic interpretation method based on the software interpretation provided by the invention has significantly solved the problem of above-mentioned two aspects, thereby has improved the accuracy of sound transit-time measurement.
Referring to Fig. 3, the waveform synoptic diagram of interpretation method when having provided Mintrop wave sound, the A/D collection plate of synchronousing working with radiating circuit among the figure collects waveform samples, D is the sampling starting point, be the T=0 moment, A is for making the starting point that DMA transmits by A/D plate buffer memory district to the microcomputer host memory, and transmission length is determined by sampling length, the Mintrop wave starting point that C collects mail number for scanning, the Mintrop wave sound duration T that the distance between DC promptly will detect.
Fig. 4 (A), (B) are the brief block diagram explanations of workflow, wherein Fig. 4 (A) comprises sampling, automatic gain, when sound judged the work block diagram that is once sampled the overall process that stops to sample by startup interior, and each sampling process is divided sampling and two stages of circulating sampling soundd out.Souning out sample phase is that the 64Kbite sample is carried out decision analysis, and its effect has 2 points, 1) in the circulation of sampling several times of minority, progressively adjust program control amplification word D, make first wave amplitude reach predetermined value.2) determine DMA transmission starting point (the A point among Fig. 3) according to predetermined sampling starting point retardation.Enter the circulating sampling state after souning out sampling, in the circulating sampling stage, is not 64Kbite but initial by DMA starting point A by the A/D plate to the sample length of microcomputer memory transmission, length is the waveform samples of sampling length, and circle collection comprises following process: A/D sampling each time---DMA transmission---Mintrop wave judgement---Parameters Calculation one screen display.The user is by the startup and the termination procedure of Keyboard Control sampling.
Fig. 4 (B) is that the Mintrop wave in Fig. 4 (A) block diagram is judged subroutine, the core content of automatic interpretation when also being, the Wn line is the true baseline E horizontal amplitude line at regular intervals (see figure 3) of distance, the spacing of Wn line and baseline E is regulated with keyboard, the effect of Wn line is similar to the count pulse of closing in the step-by-step counting sound transit-time measurement system, Wn wire spoke degree is considered as the straight-line segment sample of non-ripple with interior waveform samples, is considered as waveform samples greater than the sample of Wn line.Sample is carried out pointwise judge, to sample counting, after wavelength degree counter reaches definite value, think that Mintrop wave exists, and the intersection point of definite waveform samples and Wn line is the B point of Fig. 3 greater than the Wn line with wavelength degree counter.Determine that the true starting point c available dedicated of Mintrop wave keyboard is switched, after Mintrop wave starting point c is determined, when calculating the AC section of Fig. 3 respectively according to sampling delay amount and the dynamic deferred amount of A/D during apart from t2 and DA section apart from t1, thereby obtain Mintrop wave sound duration t.
The characteristics of automatic interpretation method are during above sound: the Wn line is true according to the on-the-spot test condition Fixed, guarantee that all the time Wn line and baseline spacing are slightly larger than the baseline noise fluctuating range, spacing is too small The count pulse level that is equivalent to close the door is too small, may cause leading erroneous judgement, spacing because of baseline noise The excessive count pulse level that is equivalent to close the door is excessive, and may cause lags behind loses ripple, also is the Wn ginseng The fixing count pulse level of closing the door of the adjustable function of number becomes controlled, is adapted to different scenes Test condition, thereby effectively solved the problem that above-mentioned two classes cause the sound transit-time measurement error, in addition One characteristics are, not with the B point as the Mintrop wave starting point, but make the true starting point of Mintrop wave with software C, two kinds of anti-methods that push away can be adapted to different test conditions, and especially method 2 is separated effectively Under the low condition of the signal to noise ratio of having determined, the Mintrop wave starting point is flooded by noise and the difficulty that can't formulate.
This instrument is compared with the sound transit-time measurement system of present nonmetal Ultrasound Instrument and is made accuracy of detection and inspection Survey efficient is greatly improved, good reproducibility, and the characteristics such as easy and simple to handle are not because of false triggering and lose Ripple and artificial error in reading has also been avoided in the interpretation that makes a mistake does not have special technique to operating personnel Requirement, operating efficiency significantly improves.
Claims (5)
1, a kind of on the ultrasound examination analyser during realization sound and the method for wave amplitude automatic interpretation, the closed loop control system that designs a calculating machine is achieved with the method soft, that hardware combines, and it is characterized in that, this method is divided into following step:
1. be set in the control variable of identification decision Mintrop wave in the baseline ground unrest:
Value with the keyboard to set up software control parameter " baseline control line Wn " of instrument;
2. set the control variable of automatic ration control Mintrop wave wave amplitude:
With the keyboard to set up software control parameter " first wave amplitude control level Av " of instrument
Value;
3. catch Mintrop wave:
The value of digitized signal sample amplitude pointwise and baseline control line Wn is compared, when
When reaching specified length, regard as seizure greater than the signal sample continuous length of Wn value
To Mintrop wave;
4. adjust first wave amplitude:
According to Mintrop wave crest sample amplitude value and Mintrop wave wave amplitude control level Av value comparative result, adjust the duty of amplifying attenuation network automatically, automatic after sampling repeatedly several times
First wave amplitude is transferred to Av ± 1 size;
5. finish the automatic interpretation of wave amplitude:
According to Mintrop wave crest sample spot amplitude and the program control value of magnification that amplifies attenuation network this moment
Calculate Mintrop wave wave amplitude numerical value, finish the automatic interpretation of wave amplitude;
6. finish the automatic interpretation of duration:
With returning the anti-true starting point C that method is determined Mintrop wave that pushes away, the duration of calculating sound is finished
The automatic interpretation of sound duration.
According to the method for the described automatic interpretation of claim 1, it is characterized in that 2, " first wave amplitude control level Av " is 16 lattice of the vertical five equilibrium in screen waveform district, the mid point value is 0, and value is ± 1～± 8 respectively up and down, sets with numerical key.
According to the method for the described automatic interpretation of claim 1, it is characterized in that 3, " baseline control line Wn " is the horizontal amplitude line that certain distance is arranged apart from horizontal base line E, its spacing is regulated by " ↑ ", " ↓ " key of keyboard.
4, according to the method for the described automatic interpretation of claim 1, it is characterized in that, a kind of definite method of the true start position C of Mintrop wave is that the intersection points B that receives waveform and baseline control line with digitizing is a starting point, and point by point scanning is counter to be pushed away, and finds the intersection point of Mintrop wave and baseline E promptly to be.
According to the method for the described automatic interpretation of claim 1, it is characterized in that 5, the another kind of the true start position C of Mintrop wave determines that method is is starting point with the intersection points B, gets the fixed-length data sample and does the least square method linear regression, the anti-intersection point C that releases Mintrop wave and baseline E.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100903 CN1052791C (en) | 1994-01-28 | 1994-01-28 | Automatic ultrasonic detecting and analytical instrument with program-control amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94100903 CN1052791C (en) | 1994-01-28 | 1994-01-28 | Automatic ultrasonic detecting and analytical instrument with program-control amplification |
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| Publication Number | Publication Date |
|---|---|
| CN1107973A CN1107973A (en) | 1995-09-06 |
| CN1052791C true CN1052791C (en) | 2000-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 94100903 Expired - Fee Related CN1052791C (en) | 1994-01-28 | 1994-01-28 | Automatic ultrasonic detecting and analytical instrument with program-control amplification |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101271044B (en) * | 2008-05-15 | 2010-04-14 | 中国科学院声学研究所东海研究站 | Ultrasonic generator appraisement instrument |
| CN103380386B (en) * | 2011-01-06 | 2016-01-20 | 路博润公司 | Ultrasonic measurement |
| CN110703235B (en) * | 2019-10-29 | 2022-08-23 | 南京俊禄科技有限公司 | Ultrasonic measuring system |
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1994
- 1994-01-28 CN CN 94100903 patent/CN1052791C/en not_active Expired - Fee Related
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| CN1107973A (en) | 1995-09-06 |
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