CN105651864B - Rock mass acoustic emission sensor - Google Patents
Rock mass acoustic emission sensor Download PDFInfo
- Publication number
- CN105651864B CN105651864B CN201610201136.8A CN201610201136A CN105651864B CN 105651864 B CN105651864 B CN 105651864B CN 201610201136 A CN201610201136 A CN 201610201136A CN 105651864 B CN105651864 B CN 105651864B
- Authority
- CN
- China
- Prior art keywords
- acoustic emission
- end cover
- boss
- signal amplifier
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
The invention relates to a sensor, in particular to a rock acoustic emission sensor. The invention aims to provide a rock mass acoustic emission sensor with wide induction frequency. The device is including the barrel, end cover I, piezoceramics, wide band acoustic emission signal amplifier, end cover II and signal connector, and barrel left end threaded connection has end cover I, and barrel right-hand member threaded connection has end cover II, and I right-hand member of end cover is equipped with the boss, and the boss installs piezoceramics on the surface, and piezoceramics's polarization face passes through the wire and connects wide band acoustic emission signal amplifier, and wide band acoustic emission signal amplifier is connected with signal connector through the wire. The invention has simple structure and low cost, and obtains the largest input of the original signal by directly coupling the shell to the high-sensitivity piezoelectric ceramic, thereby prolonging the service life of the sensor.
Description
Technical Field
The invention relates to a sensor, in particular to a rock acoustic emission sensor.
Background
The territorial personnel in China are wide, various terrains exist, and various easily-occurring hazards also exist, wherein debris flow caused by landslide is the most serious, so monitoring of rock mass instability is an important means for preventing the debris flow.
At present, the acoustic emission technology is mostly adopted for monitoring the instability of the rock mass, wherein the piezoelectric ceramics adopted in the acoustic emission sensor are mostly products of corresponding Japan companies, and the high-performance acoustic emission sensor has more imports and high cost; the acoustic emission sensor adopts a single piezoelectric ceramic as an induction device, has narrow response frequency, cannot accurately and comprehensively reflect the instability change process of the rock mass, adopts a sensor with single resonance frequency to realize the acquisition of acoustic emission signals of the rock mass in the conventional acoustic emission monitoring system for the instability of the rock mass, and has the defects of high cost, complex construction and the like if adopting sensors with different resonance frequencies; the existing acoustic emission sensors all adopt various acoustic conducting media to carry out signal coupling, and the biggest defect of the coupling mode is that the performance of the media is dramatically reduced along with the time lapse and the environmental change, so that the service life of the sensor is shortened.
Therefore, under the condition that various rock disasters occur frequently at present, the rock acoustic emission sensor with wide induction frequency, low cost and long service life is provided, and is more and more urgent under the current situation.
Disclosure of Invention
(1) Technical problem to be solved
The invention aims to overcome the defects of narrow sensor induction frequency, high cost and short service life in the prior art, and the technical problem to be solved by the invention is to provide a rock mass acoustic emission sensor with wide induction frequency.
(2) Technical scheme
In order to solve the technical problem, the invention provides a rock acoustic emission sensor which comprises a cylinder body, an end cover I, piezoelectric ceramics, a broadband acoustic emission signal amplifier, an end cover II and a signal connector, wherein the left end of the cylinder body is in threaded connection with the end cover I, the right end of the cylinder body is in threaded connection with the end cover II, a boss is arranged at the right end of the end cover I, the surface of the boss is provided with the piezoelectric ceramics, the polarization surface of the piezoelectric ceramics is connected with the broadband acoustic emission signal amplifier through a lead, the broadband acoustic emission signal amplifier is connected with the signal connector through a lead, and the signal connector is.
Preferably, the boss surface is provided with a groove, and the piezoelectric ceramic is mounted in the groove on the boss surface.
Preferably, the barrel, the end cover I and the end cover II are all made of copper.
Preferably, the piezoelectric ceramics are arranged on the surface of the boss in a welding mode.
Preferably, the piezoelectric ceramic material is a PZT system material.
Preferably, the polarization surface on the piezoelectric ceramic is a silver electrode polarization surface.
Preferably, the signal connector is an aircraft plug.
Preferably, at least one piezoceramic is provided.
The working principle is as follows: when the sensor is connected to work, external acoustic emission signals are conducted to the negative polarization surface of the piezoelectric ceramic through the cylinder body and the end cover I, induction voltage signals are generated between the two polarization surfaces of the piezoelectric ceramic, the signals are transmitted to the broadband acoustic emission signal amplifier through the lead, the broadband acoustic emission signal amplifier amplifies the transmitted signals, power interference information is filtered, amplified and purified analog acoustic emission signals are output to the signal connector, and the cylinder body plays roles of interference shielding and physical protection on the broadband acoustic emission signal amplifier.
The boss surface is equipped with the recess, and piezoceramics installs in the recess on boss surface, and this kind of mode not only can make things convenient for being connected of piezoceramics and boss, more enables the piezoceramics inseparabler with being connected of boss, extension device's life.
The cylinder body, the end cover I and the end cover II are all made of copper, and the copper can be better directly coupled with piezoelectric ceramics to form resonance.
The surface of the boss is provided with piezoelectric ceramics in a welding mode, and resonance is formed in a mode of direct coupling through welding so as to obtain the maximum original signal input.
The piezoelectric ceramic material is a PZT system material, and the PZT system material has higher piezoelectric coefficient and sensitive induction.
The polarization surface on the piezoelectric ceramic is a silver electrode polarization surface, and the silver electrode polarization surface enables signal transmission to be more accurate and rapid.
The signal connector is an aviation plug, and the aviation plug has the advantages of high connection and separation speed, good environment resistance and high reliability.
At least one piezoelectric ceramic is arranged, and a plurality of piezoelectric ceramics with different resonant frequencies can be arranged, so that the induction of wide-frequency signals is realized.
The piezoelectric ceramics, the broadband acoustic emission signal amplifier and the signal plug belong to the prior art in the field, and the connection structure is a mature technology and is not described herein again.
(3) Advantageous effects
The invention has simple structure and low cost, and obtains the largest input of the original signal by directly coupling the shell to the high-sensitivity piezoelectric ceramic, thereby prolonging the service life of the sensor.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a right side view of the end cap i of the present invention.
FIG. 3 is a top view of the end cap I of the present invention.
Figure 4 is a cross-sectional view a-a of endcap i of example 2 of the present invention.
The labels in the figures are: 1-cylinder, 2-end cover I, 3-piezoelectric ceramic, 4-broadband acoustic emission signal amplifier, 5-end cover II, 6-signal connector and 21-boss.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-3, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
Example 2
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-4, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
The surface of the boss 21 is provided with a groove, the piezoelectric ceramic 3 is arranged in the groove on the surface of the boss 21, the mode not only can facilitate the connection of the piezoelectric ceramic 3 and the boss 21, but also can enable the connection of the piezoelectric ceramic 3 and the boss 21 to be more tight, and the service life of the device is prolonged.
Example 3
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-3, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
The material of barrel 1, end cover I2 and end cover II 5 all is copper, and copper can be better carry out direct coupling with piezoceramics 3, forms the resonance.
The piezoelectric ceramics 3 are arranged on the surface of the boss 21 in a welding mode, and resonance is formed in a mode of direct coupling through welding so as to obtain the maximum original signal input.
Example 4
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-3, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
The piezoelectric ceramic 3 is made of a PZT system material, and the PZT system material has a high piezoelectric coefficient and is sensitive in induction.
The polarization surface on the piezoelectric ceramic 3 is a silver electrode polarization surface, and the silver electrode polarization surface enables signal transmission to be more accurate and rapid.
Example 5
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-3, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
The signal connector 6 is an aviation plug which has the advantages of high connection and separation speed, good environment resistance and high reliability.
Example 6
The utility model provides a rock mass acoustic emission sensor, as shown in fig. 1-4, including barrel 1, end cover I2, piezoceramics 3, wide band acoustic emission signal amplifier 4, end cover II 5 and signal connector 6, 1 left end threaded connection of barrel has end cover I2, 1 right-hand member threaded connection of barrel has end cover II 5, the I2 right-hand member of end cover is equipped with boss 21, boss 21 installs piezoceramics 3 on the surface, piezoceramics 3's polarization face passes through wire connection wide band acoustic emission signal amplifier 4, wide band acoustic emission signal amplifier 4 has signal connector 6 through wire connection, signal connector 6 installs the right side at end cover II 5.
The surface of the boss 21 is provided with a groove, the piezoelectric ceramic 3 is arranged in the groove on the surface of the boss 21, the mode not only can facilitate the connection of the piezoelectric ceramic 3 and the boss 21, but also can enable the connection of the piezoelectric ceramic 3 and the boss 21 to be more tight, and the service life of the device is prolonged.
The material of barrel 1, end cover I2 and end cover II 5 all is copper, and copper can be better carry out direct coupling with piezoceramics 3, forms the resonance.
The piezoelectric ceramics 3 are arranged on the surface of the boss 21 in a welding mode, and resonance is formed in a mode of direct coupling through welding so as to obtain the maximum original signal input.
The piezoelectric ceramic 3 is made of a PZT system material, and the PZT system material has a high piezoelectric coefficient and is sensitive in induction.
The polarization surface on the piezoelectric ceramic 3 is a silver electrode polarization surface, and the silver electrode polarization surface enables signal transmission to be more accurate and rapid.
The signal connector 6 is an aviation plug which has the advantages of high connection and separation speed, good environment resistance and high reliability.
At least one piezoelectric ceramic 3 is provided, and a plurality of piezoelectric ceramics 3 having different resonance frequencies may be provided, thereby achieving induction of a wide frequency signal.
The working principle is as follows: when the sensor is connected to work, external acoustic emission signals are conducted to the 3 negative polarization surfaces of the piezoelectric ceramics through the cylinder body 1 and the end cover I2, induction voltage signals are generated between the 3 two polarization surfaces of the piezoelectric ceramics, the signals are transmitted to the broadband acoustic emission signal amplifier 4 through a lead, the broadband acoustic emission signal amplifier 4 amplifies the transmitted signals, power interference information is filtered, amplified and purified analog acoustic emission signals are finally output to the signal connector 6, and the cylinder body 1 plays roles of interference shielding and physical protection on the broadband acoustic emission signal amplifier 4.
The above examples are merely representative of preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the present invention, and these are all within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (1)
1. A rock mass acoustic emission sensor is characterized by comprising a cylinder body (1), an end cover I (2), piezoelectric ceramics (3), a broadband acoustic emission signal amplifier (4), an end cover II (5) and a signal connector (6), wherein the left end of the cylinder body (1) is in threaded connection with the end cover I (2), the right end of the cylinder body (1) is in threaded connection with the end cover II (5), the right end of the end cover I (2) is provided with a boss (21), the surface of the boss (21) is provided with the piezoelectric ceramics (3) in a welding mode, at least one piece of piezoelectric ceramics (3) is arranged, a polarization surface of the piezoelectric ceramics (3) is connected with the broadband acoustic emission signal amplifier (4) through a lead, the broadband acoustic emission signal amplifier (4) is connected with the signal connector (6) through a lead, the signal connector (6) is arranged on the right side of the, the piezoelectric ceramic (3) is arranged in a groove on the surface of the boss (21), the cylinder body (1), the end cover I (2) and the end cover II (5) are all made of copper, the piezoelectric ceramic (3) is made of a PZT system material, a polarization surface on the piezoelectric ceramic (3) is a silver electrode polarization surface, and the signal connector (6) is an aviation plug;
the working principle of the rock mass acoustic emission sensor is as follows: work as rock mass acoustic emission sensor during operation, external acoustic emission signal passes through barrel (1) with I (2) conduction of end cover extremely the negative polarization face of piezoceramics (3), thereby produce induced voltage signal between the bipolarization face of piezoceramics (3), and transmit through the wire extremely broadband acoustic emission signal amplifier (4), broadband acoustic emission signal amplifier (4) are enlargied the signal that the transmission was come to carry out the filtering to the power interference information, and the last output is enlarged, pure simulation acoustic emission signal extremely signal joint (6), barrel (1) is right broadband acoustic emission signal amplifier (4) play interference shielding and physical protection effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201136.8A CN105651864B (en) | 2016-04-01 | 2016-04-01 | Rock mass acoustic emission sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201136.8A CN105651864B (en) | 2016-04-01 | 2016-04-01 | Rock mass acoustic emission sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105651864A CN105651864A (en) | 2016-06-08 |
| CN105651864B true CN105651864B (en) | 2020-04-10 |
Family
ID=56496015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610201136.8A Active CN105651864B (en) | 2016-04-01 | 2016-04-01 | Rock mass acoustic emission sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105651864B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088909A (en) * | 2017-12-11 | 2018-05-29 | 江西理工大学 | A kind of highly integrated acoustic emission in rock body sensor of high sensitivity |
| CN112903023B (en) * | 2021-02-07 | 2022-02-18 | 江西理工大学 | Stress and sound emission integrated sensor for homologous monitoring, monitoring method and mounting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214610U (en) * | 1987-10-29 | 1988-11-09 | 清华大学 | Acoustic emission (ae) sensor |
| CN1051087A (en) * | 1990-08-26 | 1991-05-01 | 西北工业大学 | Small sized wide-band sound-emission sensor |
| JP2005083752A (en) * | 2003-09-04 | 2005-03-31 | Taiheiyo Cement Corp | Breaking sound sensor |
| CN103115967A (en) * | 2013-01-21 | 2013-05-22 | 济南大学 | Acoustic emission sensor as well as preparation method and application thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55154460A (en) * | 1979-05-22 | 1980-12-02 | Toshiba Corp | Acoustic emission measuring method |
| CN1038347A (en) * | 1988-06-04 | 1989-12-27 | 乌克兰苏维埃***共和国科学院E帕顿电焊研究所 | The interchanger that is used for sound-emission signal recording |
| TW294783B (en) * | 1995-11-16 | 1997-01-01 | Jeng-Jong Wu | A conical transducer for measuring the elastic wave displacement parallel to the tangent direction of specimen surface and the method of measuring |
-
2016
- 2016-04-01 CN CN201610201136.8A patent/CN105651864B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214610U (en) * | 1987-10-29 | 1988-11-09 | 清华大学 | Acoustic emission (ae) sensor |
| CN1051087A (en) * | 1990-08-26 | 1991-05-01 | 西北工业大学 | Small sized wide-band sound-emission sensor |
| JP2005083752A (en) * | 2003-09-04 | 2005-03-31 | Taiheiyo Cement Corp | Breaking sound sensor |
| CN103115967A (en) * | 2013-01-21 | 2013-05-22 | 济南大学 | Acoustic emission sensor as well as preparation method and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 声发射技术在金属电化学腐蚀与应力腐蚀研究中的应用;徐健 等;《腐蚀科学与防护技术》;20090930;第21卷(第5期);第472-476页 * |
| 用于模拟声发射信号的PZT柱状相位调制器设计;何存富 等;《北京工业大学学报》;20060831;第32卷(第8期);第683-687页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105651864A (en) | 2016-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201464075U (en) | Long-range SAW temperature sensing system | |
| CN105651864B (en) | Rock mass acoustic emission sensor | |
| CN110091215A (en) | A kind of real-time monitoring Milling Force, the wireless transmission intelligence knife handle detection system of vibration | |
| CN202305004U (en) | Device for detecting inherent frequency of workpiece | |
| CN104434170A (en) | Accelerated speed induction type automatic sleeping wireless B-ultrasonic detection system | |
| CN113739908A (en) | Vibration and impact composite sensor based on MEMS chip | |
| CN202033154U (en) | Vacuum degree detection device of vacuum thermal insulation board | |
| CN203908486U (en) | Freezing sensor having intelligent ice removing function | |
| CN203798446U (en) | Vibration detection circuit | |
| CN202661481U (en) | Impact acceleration measuring device | |
| CN206364727U (en) | Interactive device and terminal | |
| CN209673278U (en) | A kind of IEPE free-field blast pressure "pencil" sensor | |
| CN204612690U (en) | High-precision air pressure type height indicator | |
| CN204007567U (en) | Bar displacement transducer zeroing device | |
| CN205785246U (en) | A kind of high-speed response remote digital amount output proximity transducer | |
| CN105371918A (en) | Coal bunker location detection method | |
| CN103728073B (en) | Operating mechanism separating brake semiaxis snapping force detection system and detection method thereof | |
| CN203054000U (en) | Wireless supersonic wave wind speed measuring system | |
| CN104913839A (en) | Fluctuation sensor based on optical fiber M-Z interferometer | |
| CN104184366A (en) | Bidirectional magnetostrictive wideband vibration energy collector | |
| CN205384377U (en) | Piezoelectricity detector arrangement and pressure -sensitive structure thereof | |
| CN202948136U (en) | Remote and wireless collecting device for acoustic emission signal | |
| CN203132683U (en) | Acoustic emission sensor | |
| CN207730340U (en) | A kind of diffusion silicon intelligence dual output temperature transmitter | |
| CN104434169A (en) | Pressure induction type automatic sleeping wireless B-ultrasonic detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Cheng Tiedong Inventor after: Yang Lirong Inventor after: Luo Xiaoyan Inventor after: Xu Sixiang Inventor after: Huang Xiaoyong Inventor before: Yang Lirong Inventor before: Cheng Tiedong |
|
| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |