CN107505042B - Differential detection method based on distributed optical fiber, application and protection system thereof - Google Patents
Differential detection method based on distributed optical fiber, application and protection system thereof Download PDFInfo
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- CN107505042B CN107505042B CN201710697561.5A CN201710697561A CN107505042B CN 107505042 B CN107505042 B CN 107505042B CN 201710697561 A CN201710697561 A CN 201710697561A CN 107505042 B CN107505042 B CN 107505042B
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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
Abstract
The invention discloses a differential detection method based on a distributed optical fiber and an application and protection system thereof. The invention adopts the difference method to detect the intrusion behavior, improves the detection precision of the protection system, avoids the misjudgment caused by the detection error of a single optical fiber and reduces the unnecessary personnel expenditure.
Description
Technical Field
The invention relates to the technical field of optical fiber vibration security, in particular to a differential detection method based on distributed optical fibers and an application and protection system thereof.
Background
Since the last 90 s, a new type of security technology based on optical fiber sensing technology appears due to the development of photoelectric technology, optical fiber technology, computer technology and integrated circuit technology: vibrating optical cable technology. The technique is primarily intended to monitor vibrations caused by various intrusion behaviors into the perimeter. Optical fibers exist both as a carrier and medium for information transfer and as a sensor. When a person approaches, steps over, or traverses an area in which the cable is deployed, a disturbance may be created to the optical fibers in the cable. When external interference acts on the optical fiber, part of the characteristics of the light transmitted by the optical fiber can change correspondingly, and the characteristics (i.e. attenuation, phase, wavelength, polarization, mode field distribution and propagation time) of the light can be effectively detected through special optical path construction and signal demodulation technology, so that external trigger events can be monitored, for example: tension, displacement, damage, vibration, shock, sound wave, temperature, load, etc.
However, in the application of the current optical fiber vibration security field, intrusion detection is usually performed through a single optical fiber, and the single optical fiber may have a certain detection error to cause misjudgment of an intrusion behavior, and when a monitoring area vibrates in a large range, the local large-range vibration submerges a vibration signal of a monitoring target, so that the intrusion behavior cannot be accurately judged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, designs a differential detection method based on a distributed optical fiber, an application and a protection system thereof, and solves the problem that the existing optical fiber vibration security system cannot accurately judge intrusion behaviors.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a differential detection method based on distributed optical fibers is characterized in that a detection optical fiber is fixed at a signal detection sensitive point of a monitoring area, and a reference optical fiber is fixed at a signal detection slow point of the monitoring area, and the differential detection method specifically comprises the following steps:
step 1: the laser simultaneously sends out light pulses with the same frequency to the detection optical fiber and the reference optical fiber respectively;
step 2: the detection optical fiber and the reference optical fiber respectively transmit light intensity and phase signals measured by each monitoring point in a sensing monitoring area to the monitoring host;
and step 3: the monitoring host respectively processes light intensity and phase signals of the detection optical fiber and the reference optical fiber and converts wavelength and phase signals into vibration signals, the monitoring host judges whether the reference optical fiber vibrates and whether the characteristic parameters of the vibration signals of the detection optical fiber are in a set range, if the reference optical fiber does not vibrate and the characteristic parameters of the vibration signals of the detection optical fiber are in the set range, the detection optical fiber generates intrusion vibration, and the monitoring host controls the alarm to give an alarm; otherwise, the alarm does not give an alarm.
Further, the characteristic parameters of the vibration signal of the detection optical fiber comprise vibration intensity, vibration frequency, vibration width and vibration duration.
Further, the specific steps of the monitoring host computer judging whether the characteristic parameter of the vibration signal of the detection optical fiber is in the set range are as follows:
step 3.1: the monitoring host judges whether the vibration intensity of the vibration signal of the detection optical fiber is within a set intensity range, if so, the step 3.2 is executed; otherwise, abandoning the vibration signal;
step 3.2: the monitoring host machine judges whether the vibration frequency of the vibration signal is within a set frequency range, if so, the step 3.3 is executed; otherwise, abandoning the vibration signal;
step 3.3: the monitoring host machine judges whether the vibration width of the vibration signal is within a set width range, if so, the step 3.4 is executed; otherwise, abandoning the vibration signal;
step 3.4: the monitoring host judges whether the vibration duration of the vibration signal is within a set duration range, and if so, the detection optical fiber generates invasion vibration; otherwise, the vibration signal is discarded.
The detection optical fiber is an optical fiber fixed at the top of the fence, and the reference optical fiber is an optical fiber buried in the ground at the bottom end of the fence.
The utility model provides an application of difference detection method in piping lane personnel intrusion prevention system based on distributed optical fiber, detection optical fiber is for burying the optic fibre in the ground at piping lane central authorities underground, and reference optical fiber is the optic fibre of fixing at the piping lane top.
A fence protection system comprises a laser, a detection optical fiber, a reference optical fiber, a monitoring host and an alarm system, wherein the detection optical fiber and the reference optical fiber are vibration sensing optical fibers, the detection optical fiber is fixed at the top end of a fence, and the reference optical fiber is embedded in the ground at the bottom end of the fence; the laser is respectively connected with the pulse signal input ends of the detection optical fiber and the reference optical fiber, the signal output ends of the detection optical fiber and the reference optical fiber are respectively connected with the signal input end of the monitoring host, and the control signal output end of the monitoring host is connected with the control signal input end of the alarm.
Further, the reference fiber is buried under the ground to a depth of 0.1m to 3 m.
A personnel intrusion protection system for a pipe gallery comprises a laser, a detection optical fiber, a reference optical fiber, a monitoring host and an alarm system, wherein the detection optical fiber and the reference optical fiber are vibration sensing optical fibers, the detection optical fiber is embedded in the ground in the center of the pipe gallery, and the reference optical fiber is fixed at the top of the pipe gallery; the laser is respectively connected with the pulse signal input ends of the detection optical fiber and the reference optical fiber, the signal output ends of the detection optical fiber and the reference optical fiber are respectively connected with the signal input end of the monitoring host, and the control signal output end of the monitoring host is connected with the control signal input end of the alarm.
The invention has the following positive beneficial effects: the differential detection method based on the distributed optical fibers is widely applied, for example, the method is used in a fence protection system and a pipe gallery personnel intrusion protection system, the intrusion behavior is detected by adopting the differential method, the detection precision of the system is improved, the misjudgment caused by the detection error of a single optical fiber is avoided, and the unnecessary personnel expenditure is reduced.
Drawings
Fig. 1 is a flow chart of a distributed optical fiber-based differential detection method according to the present invention.
Fig. 2 is a system schematic block diagram of a fence protection system or a pipe gallery personnel intrusion protection system.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The embodiment is described with reference to fig. 1, and the distributed optical fiber-based differential detection method of the present invention has wide application, and can be used in various fields, such as fence protection systems and pipe gallery personnel intrusion protection systems.
The differential detection method based on the distributed optical fiber needs to fix the detection optical fiber at a signal detection sensitive point of a monitoring area and fix the reference optical fiber at a signal detection slow point of the monitoring area. The setting of the signal detection sensitive point and the signal detection slow and blunt point is different according to different application scenes and different monitoring objects. When the differential detection method is used in a fence protection system, if a monitoring object of the system is a person (namely, whether the person climbs the fence is judged), a signal detection sensitive point is positioned at the top of the fence, and a signal detection slow point is positioned at the bottom of the fence; if the monitored object is a vehicle (namely, whether the vehicle passes through the fence is judged), the signal detection sensitive point is positioned at the bottom end of the fence, and the signal detection slow and blunt point is positioned at the top of the fence. When this difference detection method is arranged in pipe gallery personnel intrusion prevention system, because this system is used for monitoring whether someone gets into the pipe gallery, so, the sensitive point of signal detection is located the ground of pipe gallery, and the slow point of signal detection is located the top of pipe gallery.
Specifically, as shown in fig. 1, the differential detection method specifically includes the following steps:
step 1: the laser simultaneously sends out light pulses with the same frequency to the detection optical fiber and the reference optical fiber respectively;
step 2: the detection optical fiber and the reference optical fiber respectively transmit light intensity and phase signals measured by each monitoring point in a sensing monitoring area to the monitoring host;
and step 3: the monitoring host respectively processes light intensity and phase signals of the detection optical fiber and the reference optical fiber and converts wavelength and phase signals into vibration signals, the monitoring host judges whether the reference optical fiber and the detection optical fiber simultaneously vibrate, if the reference optical fiber does not vibrate and the detection optical fiber generates vibration signals, the monitoring host judges that the detection optical fiber generates intrusion vibration, and the monitoring host controls the alarm to give an alarm; otherwise, the alarm does not give an alarm.
In the actual monitoring process, interference vibration may exist in the monitoring area, and the interference vibration may also cause the detection optical fiber to vibrate, so that in the process of judging the vibration signal of the detection optical fiber, the vibration signal characteristic parameters of the detection optical fiber need to be judged, wherein the vibration signal characteristic parameters include vibration intensity, vibration frequency, vibration width and vibration duration, if all characteristic parameter values of the vibration signal are within a set range, the signal can be judged as an intrusion vibration signal, otherwise, the signal is the interference vibration signal.
The monitoring host machine judges whether the characteristic parameter of the vibration signal of the detection optical fiber is in a set range or not, and the specific steps are as follows:
step 3.1: the monitoring host judges whether the vibration intensity of the vibration signal of the detection optical fiber is within the range of 50dB-120 dB, if so, the step 3.2 is executed; otherwise, abandoning the vibration signal;
step 3.2: the monitoring host machine judges whether the vibration frequency of the vibration signal is within the range of 20Hz-80 Hz, if so, the step 3.3 is executed; otherwise, abandoning the vibration signal;
step 3.3: the monitoring host machine judges whether the vibration width of the vibration signal is within the range of 5m-50m, if so, the step 3.4 is executed; otherwise, abandoning the vibration signal;
step 3.4: the monitoring host judges whether the vibration duration of the vibration signal is within the range of 1s-5s, if so, the detection optical fiber generates invasion vibration; otherwise, the vibration signal is discarded.
The detection optical fiber is an optical fiber fixed at the top of the fence, and the reference optical fiber is an optical fiber buried in the ground at the bottom end of the fence.
The utility model provides an application of difference detection method in piping lane personnel intrusion prevention system based on distributed optical fiber, detection optical fiber is for burying the optic fibre in the ground at piping lane central authorities underground, and reference optical fiber is the optic fibre of fixing at the piping lane top.
As shown in fig. 2, a fence protection system includes a laser, a detection optical fiber, a reference optical fiber, a monitoring host and an alarm system, wherein the detection optical fiber and the reference optical fiber are vibration sensing optical fibers, the detection optical fiber is fixed at the top end of the fence, the reference optical fiber is embedded in the ground at the bottom end of the fence, and the reference optical fiber is embedded in the ground at a depth of 0.1m-3 m. The laser is respectively connected with the pulse signal input ends of the detection optical fiber and the reference optical fiber, the signal output ends of the detection optical fiber and the reference optical fiber are respectively connected with the signal input end of the monitoring host, and the control signal output end of the monitoring host is connected with the control signal input end of the alarm.
The utility model provides a piping lane personnel intrusion protection system, includes laser instrument, detection optic fibre, reference optical fibre, monitoring host computer and alarm system, detection optic fibre and reference optical fibre are vibration sensing optical fibre, detection optic fibre buries underground at piping lane central authorities' ground, detection optic fibre buries underground 0.1m-3m deeply. The reference optical fiber is fixed at the top of the pipe gallery; the laser is respectively connected with the pulse signal input ends of the detection optical fiber and the reference optical fiber, the signal output ends of the detection optical fiber and the reference optical fiber are respectively connected with the signal input end of the monitoring host, and the control signal output end of the monitoring host is connected with the control signal input end of the alarm.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will appreciate that; modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. A differential detection method based on a distributed optical fiber is characterized in that a detection optical fiber is fixed at a signal detection sensitive point of a monitoring area, and a reference optical fiber is fixed at a signal detection slow point of the monitoring area, and the differential detection method specifically comprises the following steps:
step 1: the laser simultaneously sends out light pulses with the same frequency to the detection optical fiber and the reference optical fiber respectively;
step 2: the detection optical fiber and the reference optical fiber respectively transmit light intensity and phase signals measured by each monitoring point in a sensing monitoring area to the monitoring host;
and step 3: the monitoring host respectively processes light intensity and phase signals of the detection optical fiber and the reference optical fiber and converts wavelength and phase signals into vibration signals, the monitoring host judges whether the reference optical fiber vibrates and whether the characteristic parameters of the vibration signals of the detection optical fiber are in a set range, if the reference optical fiber does not vibrate and the characteristic parameters of the vibration signals of the detection optical fiber are in the set range, the detection optical fiber generates intrusion vibration, and the monitoring host controls the alarm to give an alarm; otherwise, the alarm does not give an alarm;
the characteristic parameters of the vibration signal of the detection optical fiber comprise vibration intensity, vibration frequency, vibration width and vibration duration;
the monitoring host machine judges whether the characteristic parameter of the vibration signal of the detection optical fiber is in a set range or not, and the specific steps are as follows:
step 3.1: the monitoring host judges whether the vibration intensity of the vibration signal of the detection optical fiber is within a set intensity range, if so, the step 3.2 is executed; otherwise, abandoning the vibration signal;
step 3.2: the monitoring host machine judges whether the vibration frequency of the vibration signal is within a set frequency range, if so, the step 3.3 is executed; otherwise, abandoning the vibration signal;
step 3.3: the monitoring host machine judges whether the vibration width of the vibration signal is within a set width range, if so, the step 3.4 is executed; otherwise, abandoning the vibration signal;
step 3.4: the monitoring host judges whether the vibration duration of the vibration signal is within a set duration range, and if so, the detection optical fiber generates invasion vibration; otherwise, the vibration signal is discarded.
2. The use of the distributed optical fiber-based differential detection method of claim 1 in fence protection, wherein the detection optical fiber is an optical fiber fixed at the top of the fence, and the reference optical fiber is an optical fiber buried in the ground at the bottom of the fence.
3. The application of the distributed optical fiber-based differential detection method in the pipe gallery personnel intrusion prevention system according to claim 1, wherein the detection optical fiber is an optical fiber buried in the ground in the center of the pipe gallery, and the reference optical fiber is an optical fiber fixed at the top of the pipe gallery.
4. The distributed fiber optic-based differential detection method of claim 1, wherein the reference fiber is buried 0.1-3 m deep underground.
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| 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 |
| WO2008081157A1 (en) * | 2006-12-29 | 2008-07-10 | Schlumberger Holdings Limited | Fault-tolerant distributed fiber optic intrusion detection |
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| CN204535664U (en) * | 2015-03-26 | 2015-08-05 | 安徽工程大学 | A kind of wide range optical intensity modulation type optical fibre displacement sensor of new structure |
| CN206292933U (en) * | 2016-10-18 | 2017-06-30 | 上海广拓信息技术有限公司 | Distributed many defence area vibration optical fiber perimeter alarm systems |
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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 |
| CN101290235A (en) * | 2008-06-19 | 2008-10-22 | 电子科技大学 | Interference -type light time domain reflectometer |
| CN204535664U (en) * | 2015-03-26 | 2015-08-05 | 安徽工程大学 | A kind of wide range optical intensity modulation type optical fibre displacement sensor of new structure |
| CN206292933U (en) * | 2016-10-18 | 2017-06-30 | 上海广拓信息技术有限公司 | Distributed many defence area vibration optical fiber perimeter alarm systems |
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