CN2061689U - Ultrasonic leakage detector for gas cable - Google Patents
Ultrasonic leakage detector for gas cable Download PDFInfo
- Publication number
- CN2061689U CN2061689U CN 90203784 CN90203784U CN2061689U CN 2061689 U CN2061689 U CN 2061689U CN 90203784 CN90203784 CN 90203784 CN 90203784 U CN90203784 U CN 90203784U CN 2061689 U CN2061689 U CN 2061689U
- Authority
- CN
- China
- Prior art keywords
- circuit
- gas
- signal
- leakage
- utility
- 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.)
- Withdrawn
Links
Abstract
The utility model discloses an ultrasonic leakage detector for gas cables, belonging to a maintenance device for communication cables. Existing ultrasonic leakage detectors for gas cables use a general frequency selection amplifying method for the leak gas signals of cables and have the defects of poor selectivity and weak interference immunity. Particularly when detecting an overhead cable, the probe of the leakage detectors needs to be hung by a rod to at least one meter to the overhead cable for determining the gas leakage points. The operation is inconvenient for users. The utility model can amplify difference frequencies and raise signal-to-noise ratios. When detecting a high overhead cable which is five to ten meters from the ground, the probe of the leakage detector of the utility model can accurately determine the gas leakage points by hand.
Description
The pressurizing cable ultrasonic leak detector belongs to the telecommunication cable maintenance tool.
Existing pressurizing cable ultrasonic leak detector amplifies mode to the frequency-selecting that gas leakage signal (ultrasound wave) employing of cable is common, has poor selectivity, the weak shortcoming of antijamming capability, and the ability of therefore differentiating the point that leaks gas does not reach requirement.Moreover the probe of its leakage detection instrument is selected the capacitance probe of resonance frequency in 16～35KHZ scope for use, because 16～35KHZ is not the concentrated frequency domain of cable aperture gas leakage signal, so when surveying overground cable, to lift the probe of leakage detection instrument in 1 meter of overground cable with pole, just can tell the gas leakage point, bring a lot of inconvenience to the user.
The purpose of this utility model:
A kind of highly sensitive, pressurizing cable ultrasonic leak detector that antijamming capability is strong, easy to use is provided.
Content of the present utility model:
The utility model is made up of ultrasonic sensor, selective frequency amplifier circuit, local-oscillator circuit, mixting circuit, audio amplifier circuit.Ultrasonic sensor selects for use resonance frequency to make at the piezoelectric probe of 39KHZ～41KHZ scope, to improve the sensitivity of leakage detection instrument.Selective frequency amplifier circuit also is tuned at 39KHZ～41KHZ scope, local-oscillator circuit is designed to produce the oscillator signal of 49KHZ～51KHZ, mixting circuit is that the oscillator signal that selective frequency amplifier circuit amplifying signal and local-oscillator circuit produce is carried out mixing, producing a difference frequency signal send audio amplifying circuit amplifies, promote earphone or loudspeaker sounding then, find to show the gas leakage point.
Extremely long-pending effect of the present utility model:
The utility model is highly sensitive, antijamming capability is strong, omission factor is low, improved communication quality.When surveying overground cable gas leakage point, need not lift pole, only need with probe to point in hand held that 5～10 meters high cables just can detect the gas leakage point exactly apart from ground, alleviated user's labour intensity.
Accompanying drawing 1 is the circuit structure diagram of pressurizing cable ultrasonic leak detector.
Embodiment:
The utility model embodiment is made up of ultrasonic sensor 1, selective frequency amplifier circuit 2, local-oscillator circuit 3, mixting circuit 4, audio amplifier circuit 5.Ultrasonic sensor 1 is made by piezoelectric crystal, and its resonance frequency is elected 40KHZ as, and it is contained in the plastic casing, is connected by the input end of lead and selective frequency amplifier circuit.Selective frequency amplifier circuit 2 is by amplifier LM258, capacitor C
1, C
2, C
3, resistance R
1, R
2, potentiometer W
1, inductance L
1Form, selective frequency amplifier circuit is tuned at 40KHZ, and its function is that the gas leakage signal that ultrasonic sensor 1 is sent here is amplified.Local-oscillator circuit 3 is by transistor T
1, resistance R
8, R
9, R
10, R
7, capacitor C
8, C
9, C
10, C
11, C
12, C
13, inductance L
2Form, its oscillation frequency is 50KHZ.Mixting circuit 4 is by transistor T
2, resistance R
3, R
4, R
5, capacitor C
4, C
5, C
6, C
7, inductance L
3Form, its effect is that the signal that signal that selective frequency amplifier circuit 2 is selected and local-oscillator circuit 3 produce carries out mixing, produces a difference frequency signal, with the signal to noise ratio (S/N ratio) of raising leakage detection instrument, and the antijamming capability of raising leakage detection instrument.Audio amplifier circuit 5 is by transistor T
3, resistance R
6, R
11, R
12, R
13, capacitor C
14, C
15, C
16, inductance L
4Form, its effect is that the difference frequency signal that mixting circuit 4 produces is amplified, and to promote earphone or loudspeaker sounding, finds to show the gas leakage point.
Claims (2)
1, the pressurizing cable ultrasonic leak detector belongs to the telecommunication cable maintenance tool, and it includes ultrasonic sensor 1, selective frequency amplifier circuit 2, audio amplifier circuit 5, it is characterized in that this leakage detection instrument has increased local-oscillator circuit 3, mixting circuit 4, wherein:
(1), local-oscillator circuit 3 is by transistor T
1, resistance R
8, R
9, R
10, R
7, capacitor C
8, C
9, C
10, C
11, C
12, C
13, inductance L
2Form, and the oscillation signal frequency design is in 49KHZ～51KHZ scope;
(2), mixting circuit 4 is by transistor T
2, resistance R
3, R
4, R
5, capacitor C
4, C
5, C
6, C
7, inductance L
3Form, and the signal that mixting circuit 4 signal that selective frequency amplifier circuit 2 is selected and local-oscillator circuit 3 produce carries out mixing, produce a difference frequency signal.
2, pressurizing cable ultrasonic leak detector according to claim 1 is characterized in that selecting for use resonance frequency to make ultrasonic sensor 1 at the piezoelectric probe of 39KHZ～41KHZ scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90203784 CN2061689U (en) | 1990-04-03 | 1990-04-03 | Ultrasonic leakage detector for gas cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90203784 CN2061689U (en) | 1990-04-03 | 1990-04-03 | Ultrasonic leakage detector for gas cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2061689U true CN2061689U (en) | 1990-09-05 |
Family
ID=4884911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90203784 Withdrawn CN2061689U (en) | 1990-04-03 | 1990-04-03 | Ultrasonic leakage detector for gas cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2061689U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320341C (en) * | 2001-02-20 | 2007-06-06 | Tlv有限公司 | Movalbe leak detector |
-
1990
- 1990-04-03 CN CN 90203784 patent/CN2061689U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320341C (en) * | 2001-02-20 | 2007-06-06 | Tlv有限公司 | Movalbe leak detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Li Shengnan Document name: payment instructions |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Li Shengguo Document name: Notice of termination |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |