CN208313907U - Calibrating/calibration system of pulse reflection ultrasonic device - Google Patents

Abstract

This application discloses a kind of calibrating/calibration systems of pulse reflection ultrasonic device, the adaptation including converting the output signal of Devices to test to trigger signal；Convert the trigger signal to the function signal generator of corresponding analog signal；And the attenuator for improving the analog signal；The adaptation includes: voltage matches module at least with low-voltage and high pressure mode；The DDS signal source of the first operating mode, the second operating mode and third operating mode at least with different operating parameter；For adjusting the control module of the voltage matches module and the DDS signal source to corresponding modes.Calibrating/calibration system provided by the present application can meet the DDS signal of function signal generator using a set of dedicated adaptation and according to the requirement of different regulations and standard output, own frequency be adjusted according to Devices to test, to guarantee the corresponding time.

Description

Calibrating/calibration system of pulse reflection ultrasonic device

Technical field

The utility model relates to pulse reflection ultrasonic device calibrating/calibration system, in particular to sonic wave detector calibrating/ Calibration and reflectoscope calibrating/calibration.

Background technique

The development and metering status of sonic wave detector:

Current ultrasonic is widely used in this field of nondestructive inspection, and sonic wave detector is mainly used in concrete, rock The sound wave or Ultrasonic NDT of the nonmetallic materials such as body and core style, ceramics, graphite and structure, can carry out intensity detection, Inside configuration defects detection, Crack Detection, faying face quality and breakage layer Thickness sensitivity, homogeneity detection etc..Sound wave is examined The gage work for surveying instrument is particularly significant, according to JJG 990-2004 " sonic wave detector vertification regulation " to the items of sonic wave detector The regulation of performance indicator, it is necessary to analyze, determine that the properties of sonic wave detector refer to using the practical acoustical signal of electrical signal simulation Whether mark meets vertification regulation.

The working principle of sonic wave detector is the chip for having fixed frequency using high-voltage pulse excitation, to generate corresponding The ultrasonic wave of frequency, it is different using the velocity of sound of the ultrasonic wave to different material, echo also different principle come judge substance spy The characteristics such as property and crack.Therefore telesim acoustical signal is applied, a high-voltage pulse adaptation conversion and standard must be just passed through The matched signal of signal source, could calibrating/calibration items electric signal index.Currently, to the meter of sonic wave detector in nationwide Amount detection is all confined to carry out metering when small sound in air (or water) sound mostly.And most metrological services can only all calibrate sound When the sound of wave instrument.

The development and metering status of reflectoscope:

Supersonic detector is a kind of Portable industrial nondestructive inspection instrument, it can be quick, convenient, not damaged, accurate Ground carries out detection, the positioning, assessment and diagnosis of inside workpiece number of drawbacks (crackle, is mingled with loose, stomata).Both it can use In laboratory, engineering site can be used for.Be widely used in boiler, pressure vessel, space flight, aviation, electric power, petroleum, chemical industry, Offshore oil, pipeline, military project, shipbuilding, automobile, machine-building, metallurgy, metal-processing industry, steel construction, railway traffic, core The industries such as energy electric power, colleges and universities.With the development of digital technology, Digital Ultrasonic Flaw Detector has been widely used in, so to number A very important ring is examined and measured to the performance detecting of defectoscope, at calibration.

Country promulgates newest standards " the general skill of GB/T10061-1999:A type pulse reflection supersonic detector within 2005 Art condition ".While this new standard enables, also " JJG746-2004 supersonic detector vertification regulation " has been promulgated.Country The vertification regulation of digital supersonic flaw detector is explained in detail for the first time.The measuring requirement relative analog of digital flaw detector is visited Hurt the more demanding of instrument, therefore the requirement to measurement standard also correspondinglys increase.It is domestic at present more to the metering of reflectoscope Number accepted standard device is the calibrating device of ultrasonic flaw detector that Zhong Ce institute develops, this device has one to the metering of digital flaw detector It settles finally sex-limited, especially it only can carry out examining and determine/school according to the standard of " JJG746-2004 supersonic detector vertification regulation " Standard can not be calibrated according to Europe superscript EN 12668.

The metering status of other pulse reflection ultrasonic devices:

Most of ultrasonic device is all ultrasonic transducer output ultrasonic wave to be motivated by high-voltage pulse, then pass through detection reflection Ultrasonic wave back carries out analysis and realizes detector, and such ultrasonic device has the characteristics that common, but at present not yet formulates Vertification regulation.

Based on this, it is urgently to be resolved at present be to provide one kind can for sonic wave detector, reflectoscope and other Pulse reflection ultrasonic device carries out the system examined and determine/calibrated, and it is super which can be applied not only to different pulse reflections Acoustic equipment, and different vertification regulations can be suitable for.

Utility model content

In view of problems of the prior art, the utility model provide the calibrating of pulse reflection ultrasonic device a kind of/ Calibration system characterized by comprising

Convert the output signal of Devices to test to the adaptation of trigger signal；

Convert the trigger signal to the function signal generator of corresponding analog signal；And

For improving the attenuator of the analog signal；

The adaptation includes:

At least with the voltage matches module of low-voltage and high pressure mode；

The DDS of the first operating mode, the second operating mode and third operating mode at least with different operating parameter Signal source；

For adjusting the control module of the voltage matches module and the DDS signal source to corresponding modes.

In some embodiments of the utility model, the function signal generator has adjustable delay time, frequency Rate and amplitude.

In some embodiments of the utility model, when the DDS signal source is in the second operating mode, frequency It is arranged according to following relationship:And

When the DDS signal source is in third operating mode, frequency is arranged according to following relationship:And

Wherein, s: the sound path of instrument setting；

V: the velocity of sound of instrument setting；

T: time；

F: the frequency for the DDS signal source for needing to set.

In some embodiments of the utility model, the control module uses STC89C52RC single-chip microcontroller.

The calibrating of pulse reflection ultrasonic device provided by the utility model/calibration system major advantage is as follows:

1, a set of dedicated adaptation is had developed, this adaptation is capable of the transmitting of effectively matching pulse reflection type ultrasonic equipment Signal, and the DDS signal for meeting function signal generator is exported according to the requirement of different regulations and standard.

2, the calibrating based on the pulse reflection ultrasonic device under function signal generator triggering mode/calibration system is had studied System.

3, this project realizes reflectoscope digitlization calibrating/calibration.Calibrating to reflectoscope domestic at present and Horizontal linearity is adjusted using adjustable potentiometer in the calibrating device of ultrasonic flaw detector of calibration, and this method is not known Spend bigger, and when changing sound path, the position of beginning wave can change with the variation of sound path, while it is adjustable Maximum sound path is than relatively limited.The adaptation of the utility model can calculate the relationship between sound path and the velocity of sound, change Sound path or the velocity of sound finally calculate specific frequency, and the position of beginning wave is decided by the response time of entire adaptation circuit hardware, protect It is fixed to keep steady, and is unlikely to change.So using the adaptation after digitlization, calibrating the index of Digital Ultrasonic Flaw Detector, have very much must It wants.

Detailed description of the invention

Fig. 1 is calibrating/calibration system frame diagram of this pulse reflection ultrasonic device provided by the utility model；

Fig. 2 is that the frame of adaptation forms figure；

Fig. 3 is adaptation schematic diagram；

Fig. 4 is that single-chip microcontroller controls programming block diagram；

Fig. 5 is that LabVIEW program chart is examined and determine/calibrated to sonic wave detector；

Fig. 6 is that LabVIEW program chart is examined and determine/calibrated to reflectoscope；

Fig. 7 is sonic wave detector calibrating/calibration system block diagram；

Fig. 8 is reflectoscope calibrating/calibration system.

Specific embodiment

In order to keep the purposes, technical schemes and advantages of utility model clearer, in the following with reference to the drawings and specific embodiments Utility model is described in further detail.Although showing disclosure exemplary embodiment in attached drawing, it being understood, however, that It may be realized in various forms the utility model and should not be limited by the embodiments set forth herein.On the contrary, providing these implementations Example is to be able to more thorough explanation the utility model, and the scope of the utility model can be communicated completely to ability The technical staff in domain.

FIG. 1 to FIG. 3 is respectively calibrating/calibration system frame of pulse reflection ultrasonic device provided by the utility model The frame composition figure and adaptation schematic diagram of figure, adaptation.Calibrating/the calibration system includes sequentially connected adaptation, letter Number signal generator and precision attenuator.Wherein, adaptation includes voltage matches module, DDS (direct digital synthesis technique Direct Digital Synthesis) signal source and control module.Further, which can also include that keyboard is defeated Enter module and display module.

Specifically, adaptation is used to convert trigger signal, function signal generator for the output signal of Devices to test Corresponding analog signal is converted by the trigger signal, attenuator is for improving the analog signal.

The choice relation of function signal generator can be pacified to calibrating/calibration system performance indicator using import Prompt human relations 33250A type function signal generator, this model function signal generator have the distortion factor small, and amplitude accuracy is high, frequency The features such as accuracy is high is fully able to meet the requirements.

Attenuator selects precision attenuator, resolution ratio 0.1dB, frequency range DC~30MHz.

DDS signal source has the first operating mode, the second operating mode and the third operating mode of different operating parameter, DDS signal source functional requirement according to specified in different regulations, standard exports different trigger signals and sends out to function signal Raw device, and then high-precision analog signal is generated by function signal generator again, realization signal imitation examined and determine, calibrate or Service check.DDS technology can be increased to the frequency stability of signal generator, accuracy in water identical with reference frequency It is flat, and fine frequency can be carried out in very wide frequency range and adjusted.The signal source designed in this way can work Make in modulation condition, output level can be adjusted, also exportable various waveforms.

It is the pulse signal for exporting different frequency according to demand, this arteries and veins that DDS signal source major function is used in the present embodiment It rushes signal and requires difference between different regulations and standard, while is also different with the parameter of ultrasonic device to be measured, by monolithic The calculating of machine can accurately control the frequency and amplitude of the output pulse of DDS signal source.

Voltage matches module at least there is low-voltage and high pressure mode so that Devices to test pulse can and function The input terminal of signal generator matches.

Control module can use STC89S52RC single-chip microcontroller, according to complicated parameter and algorithm to the voltage matches list The first and described DDS signal source programming Control, i.e., for adjusting the voltage matches module and the DDS signal source to respective mode Formula.

Since the calibrating/calibration system is that multiple regulations, standard are used in conjunction with, so also needing needle to matching subsequent conditioning circuit Control programming is carried out to different regulation and standard, this is required in specific display portion, especially reflectoscope The setting of the velocity of sound, sound path parameter.It is therefore possible to use common, simple, effective display module --- LCD1602 liquid crystal display.

As shown in figure 4, which show single-chip microcontrollers to control programming block diagram, i.e., control module can control DDS letter as needed Number source enters different operating modes.First operating mode as escribed above is sonic apparatus mode, and the second operating mode is flaw detection Instrument JJG746 mode (meets " JJG746-2004 supersonic detector vertification regulation "), and third operating mode is defectoscope EN12668 mode (meets Europe superscript EN12668).

When selecting the first operating mode (sonic apparatus mode), since the pulse of sonic wave detector excitation is high-voltage pulse, There is positive pulse also to have negative pulse, so after user terminal has selected sonic wave detector calibrating/calibration mode by key, Ke Yitong It crosses single-chip microcontroller and is selected as high pressure mode, under this mode, the adaptation meeting positive/negative high-voltage pulse of Auto-matching, while matching sound wave inspection Survey the pulse signal of instrument output end.

In conjunction with Fig. 5, which show the settings when selecting the first operating mode, for function signal generator relevant parameter Method.Specifically, control delay function is extremely critical in the calibrating/calibration system, the calibrating when sound of sonic wave detector/ Calibration is mainly realized by the delay of signal source.The Congfigure Burst.vi in the function library of the 33250A of LabVIEW Function, so that it may after the corresponding function of 33250A triggering output, such as the triggering of external trigger, Transistor-Transistor Logic level rising edge, triggering are set Export several periodic signals etc..Call CongfigureTrigger.vi function in library, it can change delay time.Only need The setting and delay time setting for the Time delay output for calling above-mentioned two function that can realize to 33250A.In order to examine and determine The Frequency Response and amplitude of sonic wave detector linearly just need to change the frequency and amplitude of output signal, LabVIEW's Congfigure Standard Waveform.vi function is exactly the letter for the output of setting signal source in the function library of 33250A The function of number frequency and amplitude characteristic, by being programmed to function frequency interface and amplitude unit, amplitude size interface Setpoint frequency and amplitude size.

As shown in fig. 6, which show when selecting second or third operating mode, for function signal generator correlation The setting method of parameter, basic setup mode and same as before, therefore do not repeating.Especially, it should be noted that working as selection When the second operating mode (defectoscope JJG746 mode) or third operating mode (defectoscope EN12668 mode), it is related to by school The parameter of quasi- reflectoscope has velocity of sound harmony journey, this is just needed by calculating the velocity of sound and sound path and control DDS signal source arteries and veins The relationship for rushing frequency needs to show 11 ultrasonic echos in all over the screen, according to the position of echo according to the requirement in JJG 746 Horizontal linearity error in judgement sound path is carried out, so frequency and the relation derivation of the velocity of sound and sound path are as follows:

If calibrated according to EN12668.1, above-mentioned formula are as follows:

In formula: s: indicating the sound path of instrument setting, unit: m；

V: the velocity of sound of instrument setting, unit: m/s are indicated；

T: time, unit: s are indicated；

F: it indicates to need to set the frequency of DDS, unit: Hz.

Sonic wave detector calibrating/calibration method

When air-borne sound 1 ,/underwater sound when calibrating/calibration

Calibration when air-borne sound is carried out using the planar transducer of 50kHz in air noise adjuster, mono- point of every 60mm It is calibrated, error requirements when air-borne sound are within ± 1%.

2, calibrating/calibration when electroacoustic

A kind of method when calibrating/calibration when electroacoustic is using 33250A simulated sound, first by the mode adjustment of adaptation To the first operating mode (sonic apparatus mode), wiring block diagram such as Fig. 7

It using the trigger delay mode of 33250A when electroacoustic, can be controlled by computer, manual mode tune can also be passed through Delay time is saved, every 500 μ s, mono- sound time point examine and determine/calibrate, and error requirements when electroacoustic are within ± 0.5%.

3, amplitude is linear and calibrating/calibration of frequency response

Each single item calibration is carried out using the adjustment of the amplitude and frequency of 33250A, while amplitude is carried out using precision attenuator Auxiliary adjustment, calibrated according to JJG990 mono- one.

Reflectoscope calibrating/calibration method:

1, horizontal linearity calibrating/calibration

Horizontal linearity calibrating/calibration of reflectoscope selects the mode of adaptation, wire frame according to establishing criteria difference Figure is as shown in Figure 8.

If examine and determine according to JJG746/calibration mode when, calibrating/calibration of horizontal linearity uses frequency for 2.5MHz Or by the setpoint frequency of test examination instrument, instrument is shown that amplitude is 80%, setting is by the velocity of sound and sound path of test examination instrument, or setting The velocity of sound and sound path of adaptation make, while in conditioning instrumentation pop one's head in zero-bit consistent with adaptation parameter by test examination instrument, so that screen Curtain in 11 trigger signals with can be overlapped with the bisector of screen；Change sound path, the horizontal line below the different sound paths of calibrating/calibration Property error.

If calibrated according to Europe superscript EN12668.1, adaptation mode tuning to Europe superscript mode, operating method is same as above, 21 pulses are overlapped with screen bisector, are changed sound path, are calibrated the linearly error under different sound paths.

2, calibrating/calibration of the indexs such as attenuated error, vertical linearity

Wiring is as shown in figure 8, attenuated error and vertical linearity error are all made of 33250A amplitude or precision attenuator carries out Calibration.The gain or percentage amounts for changing the amplitude of 33250A or the attenuation of precision attenuator and instrument are calibrated.

The reception frequency response of Europe superscript

The index calibration of frequency response, which mainly changes frequency according to 33250A, to carry out, and sets the frequency band calibrated required for instrument, Adjusting attenuator makes the signal amplitude of instrument screen in 80% position, increases 3dB signal amplitude, changes frequency and makes instrument Show that signal is 80%, the frequency band surveyed at this time is the 3dB frequency response of the frequency band.

The calibration of other ultrasonic devices --- velocity of ultrasonic sound analyzer:

By taking velocity of ultrasonic sound analyzer as an example, calibration wiring is identical with Fig. 7, Fig. 8.

The main index of the calibration of Sound velocity measuring apparatus is velocity of ultrasonic sound, and the calculation formula of the velocity of sound is as follows:

In formula: s: indicating the distance of instrument setting, unit: m；

T: 33250A Time delay time, unit: s are indicated；

V: the speed show value of ultrasonic velocity analyzer, unit: m/s are indicated.

So carrying out analog ultrasonic wave in material using the signal triggering function signal generator after the matching of dedicated adaptation The time of middle propagation carries out the calibration of the velocity of sound, the error of this system electrical signal simulation acoustic velocity measutement can achieve ± 0.5% with It is interior.

Claims (5)

1. calibrating/calibration system of pulse reflection ultrasonic device characterized by comprising

Convert the output signal of Devices to test to the adaptation of trigger signal；

Convert the trigger signal to the function signal generator of corresponding analog signal；And

For improving the attenuator of the analog signal；

The adaptation includes:

At least with the voltage matches module of low-voltage and high pressure mode；

The DDS signal of the first operating mode, the second operating mode and third operating mode at least with different operating parameter Source；

For adjusting the control module of the voltage matches module and the DDS signal source to corresponding modes.

2. calibrating/calibration system of pulse reflection ultrasonic device according to claim 1, it is characterised in that: described Orchestration can change the frequency of itself according to the sound path and the velocity of sound of Devices to test.

3. calibrating/calibration system of pulse reflection ultrasonic device according to claim 1, it is characterised in that: the letter Number signal generator has adjustable delay time, frequency and amplitude.

4. calibrating/calibration system of pulse reflection ultrasonic device according to claim 2, it is characterised in that:

When the DDS signal source is in the second operating mode, frequency is arranged according to following relationship:And

When the DDS signal source is in third operating mode, frequency is arranged according to following relationship:And

Wherein, s: the sound path of instrument setting；

V: the velocity of sound of instrument setting；

T: time；

F: the frequency for the DDS signal source for needing to set.

5. calibrating/calibration system of pulse reflection ultrasonic device according to claim 2, it is characterised in that: the control Molding block uses STC89C52RC single-chip microcontroller.