CN107505042A - Difference detecting method and its application based on distribution type fiber-optic, guard system - Google Patents
Difference detecting method and its application based on distribution type fiber-optic, guard system Download PDFInfo
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- CN107505042A CN107505042A CN201710697561.5A CN201710697561A CN107505042A CN 107505042 A CN107505042 A CN 107505042A CN 201710697561 A CN201710697561 A CN 201710697561A CN 107505042 A CN107505042 A CN 107505042A
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- optical fiber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
- G01H9/006—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors the vibrations causing a variation in the relative position of the end of a fibre and another element
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- Burglar Alarm Systems (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a kind of difference detecting method and its application based on distribution type fiber-optic, guard system, the difference detecting method based on distribution type fiber-optic to intrusion behavior before detecting, the signal detection sensitive spot in monitored area is needed to fix detection optical fiber, the fixed reference optical fiber of the blunt point of signal detection in monitored area, monitoring host computer judge detection optical fiber and reference optical fiber whether and meanwhile produce vibration signal, if reference optical fiber does not produce, and detection optical fiber produces vibration signal, then judge there is intrusion behavior.The present invention detects by using calculus of finite differences to intrusion behavior, improves the accuracy of detection of guard system, avoids the false judgment caused by the detection error of simple optical fiber, reduces unnecessary personnel's spending.
Description
Technical field
The present invention relates to fiber-optic vibration technical field of security and protection, more particularly to a kind of difference detecting based on distribution type fiber-optic
Method and its application, guard system.
Background technology
Since the nineties in last century, due to the hair of photoelectric technology, optical fiber technology, computer technology and integrated circuit technique
, there is a kind of new security and guard technology based on optical fiber sensing technology in exhibition：Vibrate optical cable technology.The technology is mainly to various
It is monitored into vibrating caused by the intrusive behavior of circumference.Optical fiber both carriers and medium as information transmission, one is used as again
Plant sensor and exist.When someone approaches, oversteps or passed through the region for laying optical cable, the optical fiber in optical cable can be produced and disturbed
It is dynamic.When external interference effect is with optical fiber, the part of properties of the light of optical fiber transmission can also change accordingly therewith, by special
Light path builds the characteristic with regard to the effective detection light of energy with signal demodulation techniques（I.e. decay, phase, wavelength, polarization, mode distributions and
Propagation time）Change, and then extraneous trigger event is monitored, such as：Tension force, displacement, damage, vibration, impact, sound wave, temperature
Degree, load etc..
However, in current fiber-optic vibration safety-security area application, generally performed intrusion detection by simple optical fiber, and
Simple optical fiber may have certain detection error and cause the erroneous judgement of intrusion behavior, and when monitored area occurs to shake on a large scale
When dynamic, a wide range of vibration of locality can flood the vibration signal of monitoring objective, can not accurate judgement intrusion behavior.
The content of the invention
The purpose of the present invention is overcome the deficiencies in the prior art, designs a kind of difference detecting side based on distribution type fiber-optic
Method and its application, guard system, solve the problems, such as that existing fiber vibration safety-protection system can not accurate judgement intrusion behavior.
To reach above-mentioned purpose, the technical solution adopted in the present invention is：
A kind of difference detecting method based on distribution type fiber-optic, the signal detection sensitive spot in monitored area fix detection optical fiber,
The fixed reference optical fiber of the blunt point of signal detection in monitored area, the difference detecting method specifically include following steps：
Step 1：Laser sends frequency identical light pulse to detection optical fiber and reference optical fiber simultaneously respectively；
Step 2：The light intensity and phase that detection optical fiber and reference optical fiber respectively measure each monitoring point in its sensor monitoring region
Signal is transferred to monitoring host computer；
Step 3：Monitoring host computer the light intensity and phase signal of detection optical fiber and reference optical fiber are handled respectively and by wavelength and
Phase signal is converted to vibration signal, and monitoring host computer judges whether reference optical fiber produces the vibration signal of vibration and detection optical fiber
Whether characteristic parameter is in setting range, if reference optical fiber does not produce vibration and the vibration signal characteristics parameter of detection optical fiber is being set
Determine in scope, then detection optical fiber produces invasion vibration, monitoring host computer control alarm equipment alarm；Otherwise, alarm is not alarmed.
Further, the vibration signal characteristics parameter of the detection optical fiber includes oscillation intensity, vibration frequency, vibration width
And vibration time.
Further, monitoring host computer judges whether the vibration signal characteristics parameter of detection optical fiber is specific in setting range
Step is：
Step 3.1：Monitoring host computer judges the oscillation intensity of the vibration signal of detection optical fiber whether in setting strength range, if
It is then to perform step 3.2；Otherwise, the vibration signal is given up；
Step 3.2：Monitoring host computer judges the vibration frequency of vibration signal whether in the range of setpoint frequency, if so, then performing step
Rapid 3.3；Otherwise, the vibration signal is given up；
Step 3.3：Monitoring host computer judges the vibration width of vibration signal whether in setting width range, if so, then performing step
Rapid 3.4；Otherwise, the vibration signal is given up；
Step 3.4：Monitoring host computer judges the vibration time of vibration signal whether in the range of setting duration, if so, then detecting light
Fibre produces invasion vibration；Otherwise, the vibration signal is given up.
A kind of application of difference detecting method based on distribution type fiber-optic in fence protection, the detection optical fiber are fixation
Optical fiber at the top of fence, reference optical fiber are the optical fiber being embedded in the ground of fence bottom.
A kind of application of difference detecting method based on distribution type fiber-optic in piping lane personnel's IPS, the spy
The fine optical fiber to be embedded in the ground in piping lane center of light-metering, reference optical fiber is to be fixed on the optical fiber at the top of piping lane.
A kind of fence guard system, including laser, detection optical fiber, reference optical fiber, monitoring main frame and warning system, it is described
Detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is fixed on the top of fence, and reference optical fiber is buried
In the ground of fence bottom；Pulse signal input terminal of the laser respectively with detection optical fiber and reference optical fiber is connected, and is visited
Light-metering is fine and the signal output part of reference optical fiber is connected with monitoring the signal input part of main frame respectively, monitors the control signal of main frame
Output end and the control signal input of alarm connect.
Further, the reference optical fiber is embedded in underground 0.1m-3m depths.
A kind of piping lane personnel IPS, including laser, detection optical fiber, reference optical fiber, monitoring main frame and alarm
System, the detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is embedded in the ground in piping lane center
Interior, reference optical fiber is fixed at the top of piping lane；The laser respectively with detection optical fiber and the pulse signal input terminal of reference optical fiber
The signal output part of connection, detection optical fiber and reference optical fiber is connected with monitoring the signal input part of main frame respectively, monitors main frame
Control signal output and the control signal input of alarm connect.
The positive beneficial effect of the present invention：The difference detecting method based on distribution type fiber-optic of the present invention is widely used,
Such as in fence guard system, piping lane personnel's IPS, being detected by using calculus of finite differences to intrusion behavior,
The accuracy of detection of system is improved, avoids the false judgment caused by the detection error of simple optical fiber, it is unnecessary to reduce
Personnel pay wages.
Brief description of the drawings
Fig. 1 is the flow chart of the difference detecting method based on distribution type fiber-optic of the present invention.
Fig. 2 is the system principle diagram of fence guard system or piping lane personnel's IPS.
Embodiment
It is specific below by what is shown in accompanying drawing to make the object, technical solutions and advantages of the present invention of greater clarity
Embodiment describes the present invention.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit the model of the present invention
Enclose.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring the present invention's
Concept.
Illustrate present embodiment with reference to Fig. 1, the difference detecting method of the invention based on distribution type fiber-optic is widely used, can
For a variety of occasions, such as in fence guard system, piping lane personnel's IPS.
The difference detecting method based on distribution type fiber-optic of the present invention is, it is necessary to the sensitive solid point of signal detection in monitored area
Determine detection optical fiber, the fixed reference optical fiber of the blunt point of the signal detection in monitored area.Signal detection sensitive spot and signal detection are slow
The setting of blunt point is different and different according to application scenarios and monitoring object.When the difference detecting method is used for fence guard system
When middle, if the monitoring object of the system is people（Determine whether that personnel climb fence）When, signal detection sensitive spot, which is located at, to be enclosed
The top on column, the blunt point of signal detection are located at the bottom of fence；If monitoring object is vehicle（Determine whether vehicle by enclosing
Column）When, signal detection sensitive spot is located at the bottom of fence, and the blunt point of signal detection is located at the top of fence.When the difference is visited
When survey method is used in piping lane personnel's IPS, because the system is used to monitor whether that personnel enter piping lane, so,
Signal detection sensitive spot is located at the ground of piping lane, and the blunt point of signal detection is located at the top of piping lane.
Specifically, with reference to shown in Fig. 1, the difference detecting method specifically includes following steps：
Step 1：Laser sends frequency identical light pulse to detection optical fiber and reference optical fiber simultaneously respectively；
Step 2：The light intensity and phase that detection optical fiber and reference optical fiber respectively measure each monitoring point in its sensor monitoring region
Signal is transferred to monitoring host computer；
Step 3：Monitoring host computer the light intensity and phase signal of detection optical fiber and reference optical fiber are handled respectively and by wavelength and
Phase signal is converted to vibration signal, monitoring host computer judge reference optical fiber and detection optical fiber whether and meanwhile produce vibration, if with reference to
Optical fiber do not produce vibration and detection optical fiber produce vibration signal when, then monitoring host computer judge detection optical fiber produce invasion vibration, supervise
Control host computer control alarm equipment alarm；Otherwise, alarm is not alarmed.
During actual monitoring, there may be interference vibration in monitored area, and interference vibration can also make detection
Optical fiber produces vibration, therefore, it is necessary to judge shaking for detection optical fiber during judging the vibration signal of detection optical fiber
Dynamic signal characteristic parameter, the vibration signal characteristics parameter include oscillation intensity, vibration frequency, vibration width and vibration time,
If the various features parameter value of vibration signal in setting range, that is, can determine whether the signal as invasion vibration signal, otherwise,
The signal is interference vibration signal.
Monitoring host computer judge detection optical fiber vibration signal characteristics parameter whether concretely comprising the following steps in setting range：
Step 3.1：Monitoring host computer judges the oscillation intensity of the vibration signal of detection optical fiber whether in the range of 50dB-120 dB,
If so, then perform step 3.2；Otherwise, the vibration signal is given up；
Step 3.2：Monitoring host computer judges the vibration frequency of vibration signal whether in the range of 20Hz-80 Hz, if so, then performing
Step 3.3；Otherwise, the vibration signal is given up；
Step 3.3：Monitoring host computer judges the vibration width of vibration signal whether in the range of 5m-50m, if so, then performing step
3.4；Otherwise, the vibration signal is given up；
Step 3.4：Monitoring host computer judges the vibration time of vibration signal whether in the range of 1s-5s, if so, then detection optical fiber produces
Raw invasion vibration；Otherwise, the vibration signal is given up.
A kind of application of difference detecting method based on distribution type fiber-optic in fence protection, the detection optical fiber are fixation
Optical fiber at the top of fence, reference optical fiber are the optical fiber being embedded in the ground of fence bottom.
A kind of application of difference detecting method based on distribution type fiber-optic in piping lane personnel's IPS, the spy
The fine optical fiber to be embedded in the ground in piping lane center of light-metering, reference optical fiber is to be fixed on the optical fiber at the top of piping lane.
As shown in Fig. 2 a kind of fence guard system, including laser, detection optical fiber, reference optical fiber, monitoring main frame and report
Alert system, the detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is fixed on the top of fence, ginseng
Examine optical fiber to be embedded in the ground of fence bottom, the reference optical fiber is embedded in underground 0.1m-3m depths.The laser respectively with
Detection optical fiber connects with the pulse signal input terminal of reference optical fiber, the signal output part of detection optical fiber and reference optical fiber respectively with prison
The signal input part connection of main frame is surveyed, the control signal output of main frame is monitored and the control signal input of alarm connects.
A kind of piping lane personnel IPS, including laser, detection optical fiber, reference optical fiber, monitoring main frame and alarm
System, the detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is embedded in the ground in piping lane center
Interior, the detection optical fiber is embedded in underground 0.1m-3m depths.Reference optical fiber is fixed at the top of piping lane；The laser respectively with spy
Light-metering fibre connects with the pulse signal input terminal of reference optical fiber, the signal output part of detection optical fiber and reference optical fiber respectively with monitoring
The signal input part connection of main frame, monitors the control signal output of main frame and the control signal input of alarm connects.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that；Still
The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical scheme, it all should cover among the claimed technical scheme scope of the present invention.
Claims (8)
- A kind of 1. difference detecting method based on distribution type fiber-optic, it is characterised in that the signal detection sensitive spot in monitored area Fixed detection optical fiber, the blunt fixed reference optical fiber of point of signal detection in monitored area, the difference detecting method specifically include Following steps：Step 1：Laser sends frequency identical light pulse to detection optical fiber and reference optical fiber simultaneously respectively；Step 2：The light intensity and phase that detection optical fiber and reference optical fiber respectively measure each monitoring point in its sensor monitoring region Signal is transferred to monitoring host computer；Step 3：Monitoring host computer the light intensity and phase signal of detection optical fiber and reference optical fiber are handled respectively and by wavelength and Phase signal is converted to vibration signal, and monitoring host computer judges whether reference optical fiber produces the vibration signal of vibration and detection optical fiber Whether characteristic parameter is in setting range, if reference optical fiber does not produce vibration and the vibration signal characteristics parameter of detection optical fiber is being set Determine in scope, then detection optical fiber produces invasion vibration, monitoring host computer control alarm equipment alarm；Otherwise, alarm is not alarmed.
- 2. the difference detecting method according to claim 1 based on distribution type fiber-optic, it is characterised in that the detection optical fiber Vibration signal characteristics parameter include oscillation intensity, vibration frequency, vibration width and vibration time.
- 3. the difference detecting method according to claim 2 based on distribution type fiber-optic, it is characterised in that monitoring host computer judges The vibration signal characteristics parameter of detection optical fiber whether concretely comprising the following steps in setting range：Step 3.1：Monitoring host computer judges the oscillation intensity of the vibration signal of detection optical fiber whether in setting strength range, if It is then to perform step 3.2；Otherwise, the vibration signal is given up；Step 3.2：Monitoring host computer judges the vibration frequency of vibration signal whether in the range of setpoint frequency, if so, then performing step Rapid 3.3；Otherwise, the vibration signal is given up；Step 3.3：Monitoring host computer judges the vibration width of vibration signal whether in setting width range, if so, then performing step Rapid 3.4；Otherwise, the vibration signal is given up；Step 3.4：Monitoring host computer judges the vibration time of vibration signal whether in the range of setting duration, if so, then detecting light Fibre produces invasion vibration；Otherwise, the vibration signal is given up.
- 4. application of the difference detecting method based on distribution type fiber-optic in fence protection described in a kind of claim 3, it is special Sign is that the detection optical fiber is to be fixed on the optical fiber at the top of fence, and reference optical fiber is to be embedded in the ground of fence bottom Optical fiber.
- 5. a kind of difference detecting method based on distribution type fiber-optic described in claim 3 is in piping lane personnel's IPS Application, it is characterised in that the detection optical fiber is the optical fiber being embedded in the ground in piping lane center, and reference optical fiber is is fixed on Optical fiber at the top of piping lane.
- 6. a kind of fence guard system, it is characterised in that including laser, detection optical fiber, reference optical fiber, monitoring main frame and alarm Device, the detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is fixed on the top of fence, reference light Fibre is embedded in the ground of fence bottom；The laser connects with the pulse signal input terminal of detection optical fiber and reference optical fiber respectively Connect, the signal output part of detection optical fiber and reference optical fiber is connected with monitoring the signal input part of main frame respectively, monitors the control of main frame The control signal input connection of signal output part and alarm processed.
- 7. the difference detecting method according to claim 6 based on distribution type fiber-optic, it is characterised in that the reference optical fiber It is embedded in underground 0.1m-3m depths.
- 8. a kind of piping lane personnel IPS, it is characterised in that including laser, detection optical fiber, reference optical fiber, monitoring master Machine and alarm, the detection optical fiber and reference optical fiber are vibrating sensing optical fiber, and the detection optical fiber is embedded in piping lane center Ground in, reference optical fiber is fixed at the top of piping lane；The laser respectively with detection optical fiber and the pulse signal of reference optical fiber Input is connected, and the signal output part of detection optical fiber and reference optical fiber is connected with monitoring the signal input part of main frame respectively, is monitored The control signal output of main frame and the control signal input of alarm connect.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110657879A (en) * | 2019-09-23 | 2020-01-07 | 郑州信大先进技术研究院 | Distributed optical fiber vibration sensing positioning method and device based on FFT |
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| WO2008081157A1 (en) * | 2006-12-29 | 2008-07-10 | Schlumberger Holdings Limited | Fault-tolerant distributed fiber optic intrusion detection |
| CN101158591A (en) * | 2007-10-15 | 2008-04-09 | 北京航空航天大学 | Detecting method suitable for optical fiber distributed temperature and stress sensing device |
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| CN110657879A (en) * | 2019-09-23 | 2020-01-07 | 郑州信大先进技术研究院 | Distributed optical fiber vibration sensing positioning method and device based on FFT |
| CN110657879B (en) * | 2019-09-23 | 2021-06-11 | 郑州信大先进技术研究院 | Distributed optical fiber vibration sensing positioning method and device based on FFT |
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