CN105910772A - Ultrasonic leakage detection device and ultrasonic leakage detection method - Google Patents
Ultrasonic leakage detection device and ultrasonic leakage detection method Download PDFInfo
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- CN105910772A CN105910772A CN201610334752.0A CN201610334752A CN105910772A CN 105910772 A CN105910772 A CN 105910772A CN 201610334752 A CN201610334752 A CN 201610334752A CN 105910772 A CN105910772 A CN 105910772A
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- 238000000034 method Methods 0.000 claims description 6
- 210000005069 ears Anatomy 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 description 13
- 238000003199 nucleic acid amplification method Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to an ultrasonic leakage detection device and an ultrasonic leakage detection method. The ultrasonic leakage detection device comprises an ultrasonic leakage detection module and noise reduction modules, wherein the ultrasonic leakage detection module comprises a leakage detection instrument and a headphone; the noise reduction modules are arranged in receivers of the headphone and electrically connected with a circuit board of the headphone; and each noise reduction module comprises a pickup, a noise reduction processing chip and a sounder. According to the ultrasonic leakage detection device and the ultrasonic leakage detection method using the same, the noise reduction modules are arranged in the receivers of the headphone, the noise reduction modules can automatically collect noise signals in the environment, especially low-frequency noise signals, and generate opposite phase acoustic signals having same frequency as the noise signals after processing, and the opposite phase acoustic signals are sent out through the sounders, thereby cancelling noise in the environment, achieving the noise reduction effect, allowing a user to distinguish a target sound more clearly, being convenient to detect a leakage position rapidly and accurately, and being more accurate and reliable in detection result.
Description
Technical Field
The invention relates to the field of detecting instruments, in particular to an ultrasonic leak detection device and an ultrasonic leak detection method.
Background
Leakage in compressed air systems can cause significant energy losses, so frequent leak checking is a very important maintenance measure. Compared with the traditional method for detecting leakage by using soapy water, the ultrasonic leakage detection module has the advantage of showing the superiority of the modern precision measuring instrument. In the inspection process is revealed to the majority, the environment is noisy, but traditional ultrasonic wave leak hunting module is former to join in marriage the earphone and falls the earphone of making an uproar for ordinary physics, and the noise does not fall the circuit chip processing of making an uproar, can only the high frequency noise in the separation environment generally, and is not obvious to low frequency noise reduction effect, in the abominable occasion of noise environment, influences the differentiation of testing result.
Disclosure of Invention
Accordingly, it is desirable to provide an ultrasonic leak detection apparatus and an ultrasonic leak detection method that can effectively reduce the influence of environmental noise.
An ultrasonic leak detection device comprises an ultrasonic leak detection module and a noise reduction module;
the ultrasonic leak detection module comprises a leak detector and an earphone; the leak detector comprises a shell, and an ultrasonic sensor, an ultrasonic processing chip and an earphone interface which are arranged in the shell; the ultrasonic processing chip is electrically connected with the ultrasonic sensor and the earphone interface, the ultrasonic sensor is used for detecting an ultrasonic signal at a position to be detected, and the ultrasonic processing chip is used for converting the ultrasonic signal into an electric signal of audible sound of human ears; the earphone interface is matched with the earphone;
the noise reduction module is arranged in a receiver of the earphone and is electrically connected with a circuit board of the earphone; the noise reduction module comprises a sound pickup, a noise reduction processing chip and a sounder; the processing chip of making an uproar falls with the adapter reaches the sounder electricity is connected, the adapter is arranged in collecting the noise signal in the environment, the processing chip of making an uproar falls through the noise signal produce with the noise signal has the antiphase sound wave signal of same frequency, and via the sounder sends, in order to offset noise signal, and to by the sound signal of the signal of telecommunication conversion of human ear audible sound enlargies.
In one embodiment, a power supply installation position for installing a power supply is further arranged in the shell, and the ultrasonic processing chip is electrically connected with two electrodes of the power supply installation position.
In one embodiment, the leak detector further comprises a focusing tube and a focusing head, wherein one end of the focusing tube is connected with the shell, and the other end of the focusing tube is connected with the focusing head.
In one embodiment, the leak detector further comprises a display device disposed on the housing and electrically connected to the ultrasonic processing chip for graphically displaying the ultrasonic signal.
In one embodiment, the earphone is wrapped with a physical noise reduction component.
In one embodiment, the headset is a headset.
An ultrasonic leak detection method is characterized in that an ultrasonic leak detection device is used for leak detection, and the ultrasonic leak detection device comprises an ultrasonic leak detection module and a noise reduction module; wherein,
the ultrasonic leak detection module comprises a leak detector and an earphone; the leak detector comprises a shell, and an ultrasonic sensor, an ultrasonic processing chip and an earphone interface which are arranged in the shell; the ultrasonic processing chip is electrically connected with the ultrasonic sensor and the earphone interface, the ultrasonic sensor is used for detecting an ultrasonic signal at a position to be detected, and the ultrasonic processing chip is used for converting the ultrasonic signal into an electric signal of audible sound of human ears; the earphone interface is matched with the earphone;
the noise reduction module is arranged in a receiver of the earphone and is electrically connected with a circuit board of the earphone; the noise reduction module comprises a sound pickup, a noise reduction processing chip and a sounder; the noise reduction processing chip is electrically connected with the sound pickup and the sound generator, the sound pickup is used for collecting noise signals in the environment, the noise reduction processing chip generates reverse sound wave signals with the same frequency as the noise signals through the noise signals, and the reverse sound wave signals are emitted through the sound generator to offset the noise signals and amplify sound signals converted by the electric signals of the human ear audible sound;
the ultrasonic leak detection method comprises the following steps:
placing the leak detector at a position to be detected, and starting the leak detector;
inserting the earphone into an earphone interface of the leak detector;
and the earphone is worn to judge the leakage condition according to the sound signal.
In one embodiment, the leak detector further comprises a focusing tube and a focusing head, wherein one end of the focusing tube is connected with the shell, and the other end of the focusing tube is connected with the focusing head.
In one embodiment, the leak detector further comprises a display device disposed on the housing and electrically connected to the ultrasonic processing chip for graphically displaying the ultrasonic signal.
In one embodiment, the earphone is wrapped with a physical noise reduction component.
Above-mentioned ultrasonic wave leak hunting device and use this ultrasonic wave leak hunting device's ultrasonic wave leak hunting method, through set up the active noise reduction module in the earphone of traditional earphone, noise reduction module can the noise signal in the automatic collection environment, especially low frequency noise signal, produces the opposite phase sound wave signal that has the same frequency with this noise signal after handling, and via the sounder sends, thereby can offset the noise in the environment, realize the effect of making an uproar that falls, and be convenient for amplify the sound signal that the ultrasonic wave converted to, thereby the user can more clear discernment purpose sound, be convenient for quick accurate detect out the position of revealing, the testing result is also more accurate reliable.
Drawings
Fig. 1 is a schematic structural view of an ultrasonic leak detection apparatus of an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to FIG. 1, an ultrasonic leak detection apparatus 10 of one embodiment includes an ultrasonic leak detection module 100 and a noise reduction module 200.
The ultrasonic leak detection module 100 includes a leak detector 110 and an earpiece 120.
Leak detector 110 includes a housing 111, and an ultrasonic sensor 112, an ultrasonic processing chip (not shown), and an earphone interface 113 disposed within housing 111. The ultrasonic processing chip is electrically connected with the ultrasonic sensor 112 and the earphone interface 113. The ultrasonic sensor 112 is used to detect an ultrasonic signal at the position to be measured. The ultrasonic processing chip is used for converting the ultrasonic signals into electric signals of audible sound of human ears. The headphone interface 113 is adapted to the headphone 120.
A power supply mounting position (not shown) for mounting a power supply is further provided in the housing 111. The ultrasonic processing chip is electrically connected with the two electrodes of the power supply mounting position. Preferably, the power supply mounting position is provided with a rechargeable power supply, and correspondingly, the housing 111 is provided with a charging socket and a charging status indicator lamp. The charging state indicator light is electrically connected with the ultrasonic processing chip and used for indicating the charging state of the power supply. It is further preferable that the charging jack can share an interface with the earphone interface 113, that is, one hole is multipurpose, and can be used for both charging and audio transmission by being connected with the earphone 120.
Leak detector 110 also includes a focusing tube and a focusing head (not shown). One end of the focusing tube is connected to the housing 111, and the other end is connected to the focusing head, for example, in the embodiment, one end of the focusing tube is connected to the housing 111 by a screw thread, and the focusing head is connected to the other end of the focusing tube by a screw thread. The focusing head can focus the signal to be measured, and the signal is collected and amplified by the focusing tube and then received by the ultrasonic sensor 112.
Leak detector 110 also includes a display device 114, keys 115, and the like. A display device 114, keys 115, and the like are provided on the housing 111. The display device 114 is electrically connected to the ultrasonic processing chip for graphically displaying the ultrasonic signal. The key 115 includes a switch, a frequency adjustment button, and the like.
Further, the leak detector 110 includes signal amplification components. The ultrasonic sensor 112 is electrically connected to the ultrasonic processing chip through the signal amplification assembly. The ultrasonic signals collected by the ultrasonic sensor 112 are amplified by the signal amplification component and then received by the ultrasonic processing chip for processing. The signal amplification assembly can comprise a preamplification circuit, a band-pass filter circuit and a secondary amplification circuit. The pre-amplification circuit is electrically connected to the ultrasonic sensor 112, the band-pass filter circuit is electrically connected to the pre-amplification circuit and the secondary amplification circuit, and the secondary amplification circuit is electrically connected to the ultrasonic processing chip. The pre-amplification circuit performs voltage amplification on the ultrasonic signal acquired by the ultrasonic sensor 112. The band-pass filter circuit is used for filtering background noise in the ultrasonic signal and noise generated by a circuit device or a circuit. The secondary amplification circuit carries out secondary amplification on the filtered ultrasonic signals and transmits the ultrasonic signals to the ultrasonic processing chip.
The leak detector 110 may also include a laser positioning assembly. The laser potential assembly is used for emitting ray-shaped visible light so as to be used for positioning the position to be measured.
The headset 120 receives audio signals by being inserted into the headset interface 113. In the present embodiment, the noise reduction module 200 is disposed in the earpiece 122 of the headset 120 and electrically connected to the circuit board of the headset 120.
The noise reduction module 200 includes a sound pickup 210, a noise reduction processing chip 220 and a sound generator 230. The noise reduction processing chip 220 is electrically connected to the sound pickup 210 and the sound generator 230, respectively. The microphone 210 is used to collect noise signals in the environment. The noise reduction processing chip 220 generates an inverse sound wave signal having the same frequency as the noise signal through the noise signal, and sends the inverse sound wave signal through the sound generator 230 to cancel the noise signal in the environment, so as to achieve the purpose of noise reduction or noise cancellation, and amplifies the sound signal converted from the electric signal of the audible sound of the human ear, so that the audio signal generated by the leak detector 110 can be transmitted to the human ear in a cleaning manner without being influenced by the environmental noise.
In this embodiment, the earpiece 122 of the earpiece 120 is wrapped with a physical noise reduction feature. The part of making an uproar falls in physics sets up around earphone 122, can wrap the people's ear in inside, forms the enclosure space, can have better separation effect to the high frequency noise in the environment, and the module 200 of making an uproar falls in the cooperation, can all shield high frequency and low frequency noise.
Further preferably, the headset is a headphone. The physical noise reduction features of the headset can completely wrap the human ear and facilitate installation of the noise reduction module 200 and ambient noise collection, thereby facilitating reduction of the effects of ambient noise.
The embodiment also provides an ultrasonic leak detection method. The ultrasonic leak detection method uses the ultrasonic leak detection apparatus 10 described above. The ultrasonic leak detection method comprises the following steps:
the method comprises the following steps: placing the leak detector at a position to be detected, and starting the leak detector;
step two: inserting an earphone into an earphone interface of the leak detector;
step three: and the earphone is worn to judge the leakage condition according to the sound signal.
Above-mentioned ultrasonic wave leak hunting device 10 and use this ultrasonic wave leak hunting method of device 10 of detecting, through set up noise reduction module 200 in earphone 120's earphone 122, noise reduction module 200 can the noise signal in the automatic collection environment, especially low frequency noise signal, produce the opposite phase sound wave signal that has the same frequency with this noise signal after handling, and send via sounder 230, thereby can offset the noise in the environment, realize the effect of making an uproar, the user can more clear discernment purpose sound, be convenient for quick accurate detection to reveal the position, the testing result is also more accurate reliable.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An ultrasonic leak detection device is characterized by comprising an ultrasonic leak detection module and a noise reduction module;
the ultrasonic leak detection module comprises a leak detector and an earphone; the leak detector comprises a shell, and an ultrasonic sensor, an ultrasonic processing chip and an earphone interface which are arranged in the shell; the ultrasonic processing chip is electrically connected with the ultrasonic sensor and the earphone interface, the ultrasonic sensor is used for detecting an ultrasonic signal at a position to be detected, and the ultrasonic processing chip is used for converting the ultrasonic signal into an electric signal of audible sound of human ears; the earphone interface is matched with the earphone;
the noise reduction module is arranged in a receiver of the earphone and is electrically connected with a circuit board of the earphone; the noise reduction module comprises a sound pickup, a noise reduction processing chip and a sounder; the processing chip of making an uproar falls with the adapter reaches the sounder electricity is connected, the adapter is arranged in collecting the noise signal in the environment, the processing chip of making an uproar falls through the noise signal produce with the noise signal has the antiphase sound wave signal of same frequency, and via the sounder sends, in order to offset noise signal, and to by the sound signal of the signal of telecommunication conversion of human ear audible sound enlargies.
2. The ultrasonic leak detection apparatus according to claim 1, wherein a power supply mounting site for mounting a power supply is further provided in said housing, and said ultrasonic processing chip is electrically connected to both electrodes of said power supply mounting site.
3. Ultrasonic leak detection apparatus as defined in claim 1, wherein the leak detector further comprises a focusing tube and a focusing head, the focusing tube being connected at one end to the housing and at the other end to the focusing head.
4. Ultrasonic leak detection apparatus as defined in claim 1, wherein the leak detector further comprises a display device provided on the housing and electrically connected to the ultrasonic processing chip for graphically displaying the ultrasonic signal.
5. The ultrasonic leak detection device according to any one of claims 1 to 4, wherein a physical noise reduction member is wrapped around an outer earpiece of the earphone.
6. The ultrasonic leak detection apparatus of claim 5, wherein said earphone is a headset.
7. An ultrasonic leak detection method is characterized in that an ultrasonic leak detection device is used for leak detection, and the ultrasonic leak detection device comprises an ultrasonic leak detection module and a noise reduction module; wherein,
the ultrasonic leak detection module comprises a leak detector and an earphone; the leak detector comprises a shell, and an ultrasonic sensor, an ultrasonic processing chip and an earphone interface which are arranged in the shell; the ultrasonic processing chip is electrically connected with the ultrasonic sensor and the earphone interface, the ultrasonic sensor is used for detecting an ultrasonic signal at a position to be detected, and the ultrasonic processing chip is used for converting the ultrasonic signal into an electric signal of audible sound of human ears; the earphone interface is matched with the earphone;
the noise reduction module is arranged in a receiver of the earphone and is electrically connected with a circuit board of the earphone; the noise reduction module comprises a sound pickup, a noise reduction processing chip and a sounder; the noise reduction processing chip is electrically connected with the sound pickup and the sound generator, the sound pickup is used for collecting noise signals in the environment, the noise reduction processing chip generates reverse sound wave signals with the same frequency as the noise signals through the noise signals, and the reverse sound wave signals are emitted through the sound generator to offset the noise signals and amplify sound signals converted by the electric signals of the human ear audible sound;
the ultrasonic leak detection method comprises the following steps:
placing the leak detector at a position to be detected, and starting the leak detector;
inserting the earphone into an earphone interface of the leak detector;
and the earphone is worn to judge the leakage condition according to the sound signal.
8. A method of ultrasonic leak detection as defined in claim 7, wherein the leak detector further comprises a focusing tube and a focusing head, the focusing tube being connected at one end to the housing and at another end to the focusing head.
9. The ultrasonic leak detection method of claim 7, wherein the leak detector further comprises a display device, the display device being provided on the housing and electrically connected to the ultrasonic processing chip for graphically displaying the ultrasonic signal.
10. The ultrasonic leak detection method according to any one of claims 7 to 9, wherein a physical noise reduction member is wrapped around an outer earpiece of the earphone.
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| CN201610334752.0A CN105910772B (en) | 2016-05-18 | 2016-05-18 | Ultrasonic leak detection device and ultrasonic leak detection method |
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| CN201610334752.0A CN105910772B (en) | 2016-05-18 | 2016-05-18 | Ultrasonic leak detection device and ultrasonic leak detection method |
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| CN105910772B CN105910772B (en) | 2018-09-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702862A (en) * | 2017-11-15 | 2018-02-16 | 潘绍兵 | A kind of valve leaks detection means |
| CN109515359A (en) * | 2017-09-19 | 2019-03-26 | 福特全球技术公司 | Ultrasonic noise in vehicle's passenger compartment is eliminated |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050972U (en) * | 1989-03-24 | 1990-01-10 | 东南大学 | Harmonic vibration type supersonic sensor for air leakage testing |
| CN2290039Y (en) * | 1997-04-09 | 1998-09-02 | 黄震 | Ultrasonic leak hunting apparatus |
| CN101217828A (en) * | 2007-01-04 | 2008-07-09 | 财团法人工业技术研究院 | A noise suppression device and method |
| CN105067198A (en) * | 2015-07-21 | 2015-11-18 | 深圳西大仪器有限公司 | Leakage detector and leakage detection method |
| CN205001870U (en) * | 2015-09-25 | 2016-01-27 | 南昌理工学院 | Pipeline ultrasonic leak detection device |
| CN205642755U (en) * | 2016-05-18 | 2016-10-12 | 广东溢达纺织有限公司 | Ultrasonic wave detecting leakage device |
-
2016
- 2016-05-18 CN CN201610334752.0A patent/CN105910772B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2050972U (en) * | 1989-03-24 | 1990-01-10 | 东南大学 | Harmonic vibration type supersonic sensor for air leakage testing |
| CN2290039Y (en) * | 1997-04-09 | 1998-09-02 | 黄震 | Ultrasonic leak hunting apparatus |
| CN101217828A (en) * | 2007-01-04 | 2008-07-09 | 财团法人工业技术研究院 | A noise suppression device and method |
| CN105067198A (en) * | 2015-07-21 | 2015-11-18 | 深圳西大仪器有限公司 | Leakage detector and leakage detection method |
| CN205001870U (en) * | 2015-09-25 | 2016-01-27 | 南昌理工学院 | Pipeline ultrasonic leak detection device |
| CN205642755U (en) * | 2016-05-18 | 2016-10-12 | 广东溢达纺织有限公司 | Ultrasonic wave detecting leakage device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109515359A (en) * | 2017-09-19 | 2019-03-26 | 福特全球技术公司 | Ultrasonic noise in vehicle's passenger compartment is eliminated |
| CN109515359B (en) * | 2017-09-19 | 2024-10-01 | 福特全球技术公司 | Ultrasonic noise cancellation in a vehicle passenger compartment |
| CN107702862A (en) * | 2017-11-15 | 2018-02-16 | 潘绍兵 | A kind of valve leaks detection means |
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| CN105910772B (en) | 2018-09-28 |
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