CN104236505A - Pipeline corrosion monitoring device based on array type piezoelectric film sensor - Google Patents
Pipeline corrosion monitoring device based on array type piezoelectric film sensor Download PDFInfo
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- CN104236505A CN104236505A CN201410478481.7A CN201410478481A CN104236505A CN 104236505 A CN104236505 A CN 104236505A CN 201410478481 A CN201410478481 A CN 201410478481A CN 104236505 A CN104236505 A CN 104236505A
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a pipeline corrosion monitoring device based on an array type piezoelectric film sensor. The thickness of the pipeline curved surface area range is tested. The device comprises an ultrasonic wave signal excitation module, an array type piezoelectric film sensor module, a signal collection and processing module and a signal analysis module. The ultrasonic wave signal excitation module is responsible for controlling a pulse signal generating device to generate periodic narrow pulses. The array type piezoelectric film sensor module is excited to generate ultrasonic waves, the ultrasonic waves are repeatedly reflected back and forth on the upper surface and the lower surface of a tested part, and reflected waves produced by reflection are received by an array type piezoelectric film sensor probe to form electric signals. The signal collection and processing module is responsible for carrying out amplifying, filtering and multi-channel scanning processing on the electric signals and sending the processed electric signals to the signal analysis module. The signal analysis module is responsible for counting the propagation time of the ultrasonic waves on the upper surface and the lower surface, waveform data analysis software is adopted for figuring out the thickness of the tested part, the measurement thickness change situation is output, and therefore the corrosion situation is detected.
Description
Technical field
The present invention relates to Dynamic Non-Destruction Measurement, belong to structural health detection field, be specifically related to a kind of corrosive pipeline monitoring device based on array piezoelectric membrane (PVDF) sensor.
Background technology
Now, the continuation of China's economic development and high speed more and more urgent to the energy demand based on hydrocarbon resources.Pipeline, in view of many advantages, has become one of hydrocarbon resources transport Main Means, thus prevents the accidents such as pipe leakage very important.Ultrasonic Detection is conventional Dynamic Non-Destruction Measurement, have easy to carry, measure easy, precision is high, error is little, can when not damage equipment, parts, accurate testing pipes wall thickness.In the curved surface such as boiler, pipeline detects, conventional Ultrasound piezoelectric sensor has a lot of restrictions and difficulty, and be the structure of curved surface to this kind of surface of test piece to be measured, the piezoelectric probe of present stage directly cannot carry out thickness measure to it.In addition, in practical engineering application, the detection of pressure pipeline corrosion condition needs to carry out thickness measure to multiple spot in the multiple region of pipeline or a certain comparatively large regions.It is loaded down with trivial details that single-point detects complicated operation, and data record is chaotic, is unfavorable for the long term monitoring to pressure pipeline corrosion condition.
Summary of the invention
In view of this, the invention provides a kind of corrosive pipeline monitoring device based on array piezoelectric film sensor, achieve and the thickness of canal surface regional extent is tested.
The present invention for achieving the above object, adopts following technical scheme:
Based on a corrosive pipeline monitoring device for array piezoelectric film sensor, comprise ultrasonic signal stimulating module, array piezoelectric film sensor module, Signal acquiring and processing module and signal analyse block; In ultrasonic signal stimulating module array of loading formula piezoelectric film sensor module, the input end of Signal acquiring and processing module and array piezoelectric film sensor model calling, the output terminal of Signal acquiring and processing module is connected with signal analyse block;
Ultrasonic signal stimulating module is responsible for control wave generating means and is sent periodic short pulse, and this periodic short pulse is in order to encourage array piezoelectric film sensor module to produce ultrasound wave;
Array piezoelectric film sensor module is subject to excitation and produces ultrasound wave, and ultrasound wave is at test specimen above and below roundtrip in multiple times, and the reflection wave that reflection produces is received by array piezoelectric film sensor probe and forms electric signal;
Signal acquiring and processing comprises signal condition unit, signal gathering unit, hyperchannel scanning unit; Be responsible for, by after electric signal amplification, filtering and hyperchannel scanning process, sending to signal analyse block;
Signal analyse block is responsible for statistics ultrasound wave in the travel-time on upper and lower surface, adopts Wave data analysis software, calculates specimen thickness, export detect thickness situation of change, to detect corrosion condition.
Beneficial effect of the present invention:
System provided by the present invention adopts array piezoelectric film sensor and ultrasonic thickness test technology respectively, carries out regional curved surface thickness measuring, significantly improve Corrosion monitoring efficiency to pipeline, achieves corrosive pipeline monitoring.The present invention, relative to traditional ultrasound wave tube wall thickness measuring method, avoids complicated measuring equipment, loaded down with trivial details test process, and achieves area monitoring function.
Accompanying drawing explanation
Fig. 1 is the corrosive pipeline monitoring device structural drawing that the present invention is based on array piezoelectric film sensor.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The invention provides a kind of corrosive pipeline monitoring system based on array piezoelectric film sensor, this system comprises ultrasonic signal stimulating module, array piezoelectric film sensor module, Signal acquiring and processing module and signal analyse block.Wherein: ultrasonic signal driver unit control wave generating means sends periodic short pulse, be loaded on array piezoelectric film sensor probe, probe is subject to excitation and produces ultrasound wave, and ultrasound wave can at test specimen above and below roundtrip in multiple times.These reflection waves are received by piezoelectric probe and form electric signal, again by after the Signal acquiring and processing such as amplification, filtering, hyperchannel scanning, count the travel-time of ultrasound wave on upper and lower surface by signal analyse block, and then calculate specimen thickness, to detect corrosion condition.
The function of each module is:
Ultrasonic signal stimulating module, for sending periodic short pulse to encourage piezoelectric chip to produce ultrasound wave.Ultrasonic signal excitation adopts circuit mode to realize, and its essence is monostalbe trigger.The present invention with 555 timers for core makes monostalbe trigger.555 timers are multiduty A-D analog-digital hydrid integrated circuits, utilize 555 timers can build monostalbe trigger very easily.The principle of work that monostalbe trigger produces high voltage pulse is RC discharge circuit.By the high pressure mica capacitor discharge of trigger circuit control store electric energy, produce the pulse signal of instantaneous high pressure whereby.Wherein tw is output pulse width, is the time that the voltage of electric capacity C is charged to by 0.Regulate tw can obtain the narrow pulse signal of this requirement of experiment.
From above formula, output pulse width tw is only relevant to the size of R and C.Therefore, the size of R, C is regulated to get final product regulation output pulse width.In actual applications, resistance R being arranged to adjustable Rw, changing pulse width by regulating Rw.
Array piezoelectric film sensor module, sends ultrasound wave for excited target and accepts ultrasonic echo, producing piezoelectric signal, and output to Signal acquiring and processing module with this.The mentality of designing of array is based on monomer PVDF piezoelectric film sensor, multi-disc PVDF piezoelectric membrane is integrated arrangement on a flexible substrate according to the actual requirement of measurand, forming array formula sensor group, realizes multiple spot in multiple region or a certain comparatively large regions and carries out thickness measure.
Signal acquiring and processing module, for piezoelectric signal conditioning, signal A/D conversion, sampling, hyperchannel scanning etc.Wherein, signal condition act as
(1) the high internal impedance of piezoelectric film sensor be converted into Low ESR be convenient to export, realize impedance conversion;
(2) charge signal can not directly gather, measured converts voltage signal to;
(3) comparatively small and weak charge signal is amplified;
(4) HF noise signal is removed;
(5) object that electric signal is amplified is realized.
In the present invention, piezoelectric signal modulate circuit is mainly divided into three grades: charge amplifier, low-pass filter circuit and voltage amplifier.Employing take integrated chip as the signal conditioning circuit of core parts, and integrated chip is AD745, LMF90 and MAX7410 mainly.
AD745 is the imported charge amplifier chip of field effect transistor.It has the features such as noise is little, plus and blowup, broadband, rapid translating.When the first order amplifying element as piezoelectric film sensor signal condition, resistance can mate the high internal impedance of PVDF piezoelectric crystal preferably up to the AD745 input impedance of 1010 Ω.
LMF90 is a quadravalence trapper.The anti-electromagnetic interference capability of piezoelectric film sensor is poor, and undesired signal mainly concentrates on the frequency range of 50Hz and 150Hz.And LMF90 can be used for power frequency interference signals and the frequency-doubled signal thereof of filtering 50Hz.MAX7410 is a kind of adjustable filtering circuit chip.Its filter function not only comprises low pass, also includes band simultaneously and leads to and high-pass filtering.
The output signal of piezoelectric film sensor will be admitted to host computer and carry out data analysis and calculating after electric charges amplify, low pass filtered involve voltage amplification, thus also need to add A/D conversion and signal acquisition circuit.The present invention will on hurricane 3 generation RC3-2C20 development board modelled signal Acquisition Circuit.Hurricane 3 generation RC3-2C20 development board is made up of core board (comprising the minimum system of the formation nios of FPGA), basic function expansion board (base plate) and SOPC platform (System on Programming Chip platform).The basic function expanding surface of base plate is to all FPGA development of users; SOPC platform is then for user provides the choice of new embedded electronic design.Development board contains communication, data conversion, controls, stores and man-machine communication's several respects.
Signal analyse block, for piezoelectric signal waveform acquisition, control with display, calculate test thickness.The present invention use software systems be the supporting exploitation of hurricane 3 generation RC3-2C20 development board waveform acquisition, control with show software platform.These software systems devise several functions for mating each chip on development board, and in this experiment, what relate generally to has data acquisition, imaging and playback; Image is arranged; The functions such as multi graph display.These functions will be analyzed very easily, process data.
After the flow process of system software is roughly system electrification, ultrasonic signal exciting circuit starts to launch narrow-band ping excitation PVDF piezoelectric film sensor, PVDF piezoelectric sensor exports electric signal after producing ultrasound wave, induction echoed signal, is sent to signal conditioning circuit.Simultaneously, A/D converter A/D7862 is started by FPGA, A/D converter collection is converted to the digital quantity of 12 through the simulating signal amount nursed one's health, walking abreast is input in FPGA again, be transferred in host computer by serial line interface RS-232 after rough handling in FPGA, and demonstrate image on software interface.
The course of work of native system is:
(1) tested object and sensor design is chosen
Determine test specimen and tested point position thereof, design the arrangement of sensor internal piezoelectric membrane with this.Utilize couplant that array piezoelectric film sensor is bonded in test specimen position to be measured.
(2) electrical quantity is determined
Choose suitable ultrasonic signal excitation parameters, pulse excitation signal frequency is 200MHz, amplitude maximum is 380V, adjustment width is 300ns to 50 μ s.
Modelled signal Acquisition Circuit, A/D change-over circuit on hurricane 3 generation RC3-2C20 development board.Operating voltage is+5V; Sampling rate is 250Ksps, and switching time is 4 μ s; Support 12 bit digital quantity parallel outputs, the input range of analog quantity comprises 0 to 2.5V.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. based on a corrosive pipeline monitoring device for array piezoelectric film sensor, it is characterized in that: comprise ultrasonic signal stimulating module, array piezoelectric film sensor module, Signal acquiring and processing module and signal analyse block; In ultrasonic signal stimulating module array of loading formula piezoelectric film sensor module, the input end of Signal acquiring and processing module and array piezoelectric film sensor model calling, the output terminal of Signal acquiring and processing module is connected with signal analyse block; Wherein:
Ultrasonic signal stimulating module is responsible for control wave generating means and is sent periodic short pulse, and this periodic short pulse is in order to encourage array piezoelectric film sensor module to produce ultrasound wave;
Array piezoelectric film sensor module is subject to excitation and produces ultrasound wave, and ultrasound wave is at test specimen above and below roundtrip in multiple times, and the reflection wave that reflection produces is received by array piezoelectric film sensor probe and forms electric signal;
Signal acquiring and processing comprises signal condition unit, signal gathering unit, hyperchannel scanning unit; Be responsible for, by after electric signal amplification, filtering and hyperchannel scanning process, sending to signal analyse block;
Signal analyse block is responsible for statistics ultrasound wave in the travel-time on upper and lower surface, adopts Wave data analysis software, calculates specimen thickness, export detect thickness situation of change, to detect corrosion condition.
2. a kind of corrosive pipeline monitoring device based on array piezoelectric film sensor as claimed in claim 1, it is characterized in that: comprise piezoelectric signal modulate circuit in described Signal acquiring and processing module, this piezoelectric signal modulate circuit is mainly divided into three grades: charge amplifier, low-pass filter circuit and voltage amplifier; Employing take integrated chip as the signal conditioning circuit of core parts, and integrated chip is AD745, LMF90 and MAX7410.
3. a kind of corrosive pipeline monitoring device based on array piezoelectric film sensor as claimed in claim 1 or 2, is characterized in that: utilize couplant that array piezoelectric film sensor module is bonded in test specimen position to be measured during test.
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| CN201410478481.7A CN104236505A (en) | 2014-09-18 | 2014-09-18 | Pipeline corrosion monitoring device based on array type piezoelectric film sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606054A (en) * | 2015-12-29 | 2016-05-25 | 中国石油化工股份有限公司 | Fixed-point thickness measuring device for refining equipment and thickness measuring method |
| CN107402254A (en) * | 2017-09-25 | 2017-11-28 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline checking method and device |
| CN107741455A (en) * | 2017-11-27 | 2018-02-27 | 桂林电子科技大学 | A Gas Detection Device Based on Dot Matrix Piezoelectric Film Sensor |
| CN108872319A (en) * | 2018-03-27 | 2018-11-23 | 哈尔滨工业大学深圳研究生院 | A kind of corrosion sensor |
| CN111103153A (en) * | 2018-10-25 | 2020-05-05 | 上海铁路通信有限公司 | Bogie structure safety monitoring device |
| CN112129431A (en) * | 2020-09-11 | 2020-12-25 | 合肥工业大学 | Wrist-based PVDF sensor array structure and its performance testing device |
| CN112129834A (en) * | 2020-09-22 | 2020-12-25 | 江苏师范大学 | Ultrasonic metal corrosion monitoring device and method |
| CN114263856A (en) * | 2021-12-27 | 2022-04-01 | 中国石油大学(北京) | Corrosion monitoring system and method based on two-dimensional flexible area array piezoelectric ultrasound |
| CN114593370A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system |
| CN115420229A (en) * | 2022-08-26 | 2022-12-02 | 成都蕊感微电子有限公司 | A pipeline grease detection device and method |
| CN118726932A (en) * | 2024-08-27 | 2024-10-01 | 浙江理工大学 | A thin film parameter monitoring method based on micro piezoelectric sensor |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606054A (en) * | 2015-12-29 | 2016-05-25 | 中国石油化工股份有限公司 | Fixed-point thickness measuring device for refining equipment and thickness measuring method |
| CN107402254A (en) * | 2017-09-25 | 2017-11-28 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline checking method and device |
| CN107741455A (en) * | 2017-11-27 | 2018-02-27 | 桂林电子科技大学 | A Gas Detection Device Based on Dot Matrix Piezoelectric Film Sensor |
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| CN111103153A (en) * | 2018-10-25 | 2020-05-05 | 上海铁路通信有限公司 | Bogie structure safety monitoring device |
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| CN112129431B (en) * | 2020-09-11 | 2022-04-05 | 合肥工业大学 | PVDF sensor array structure based on wrist and performance testing device thereof |
| CN112129834A (en) * | 2020-09-22 | 2020-12-25 | 江苏师范大学 | Ultrasonic metal corrosion monitoring device and method |
| CN114593370A (en) * | 2020-12-04 | 2022-06-07 | 中国石油化工股份有限公司 | Natural gas denitrification solvent absorption pipeline failure early warning method and corresponding system |
| CN114263856A (en) * | 2021-12-27 | 2022-04-01 | 中国石油大学(北京) | Corrosion monitoring system and method based on two-dimensional flexible area array piezoelectric ultrasound |
| CN115420229A (en) * | 2022-08-26 | 2022-12-02 | 成都蕊感微电子有限公司 | A pipeline grease detection device and method |
| CN118726932A (en) * | 2024-08-27 | 2024-10-01 | 浙江理工大学 | A thin film parameter monitoring method based on micro piezoelectric sensor |
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