阅读说明：本技术 一种室内文物安防光纤传感系统及监控方法 (Indoor text security fiber sensing system and monitoring method ) 是由 罗洪 邓志儒 徐栋 石滔 陈超育 郭运动 吴杰 于 2021-09-09 设计创作，主要内容包括：本发明适用于光纤通信技术领域,涉及一种室内文物安防光纤传感系统,包括：光纤分束器,用于实现外部光源的光信号分路；光纤地听器,用于接收光纤分束器传输的光信号；光电探测器,用于采集光纤地听器中光信号的振动信息并转化为数字信号；解调模块,用于将光电探测器得到的数字信号转化为振动信号；信号处理模块,用于将解调模块得到的振动信号转化为告警信息；显控终端,用于接收信号处理模块的告警信息；光纤分束器与八个光纤地听器连接,八个光纤地听器与光电探测器连接,光电探测器、解调模块、信号处理模块、显控终端依次连接。本发明可以监控馆藏室内的文物,可防止文物的盗取以及对有害生物的监控与告警。(The invention is suitable for the technical field of optical fiber communication, and relates to an indoor text security optical fiber sensing system, which comprises: the optical fiber beam splitter is used for realizing optical signal shunting of an external light source; the optical fiber geophone is used for receiving the optical signal transmitted by the optical fiber beam splitter; the photoelectric detector is used for collecting vibration information of optical signals in the optical fiber geophone and converting the vibration information into digital signals; the demodulation module is used for converting the digital signal obtained by the photoelectric detector into a vibration signal; the signal processing module is used for converting the vibration signal obtained by the demodulation module into alarm information; the display control terminal is used for receiving the alarm information of the signal processing module; the optical fiber beam splitter is connected with the eight optical fiber geophones, the eight optical fiber geophones are connected with the photoelectric detector, and the photoelectric detector, the demodulation module, the signal processing module and the display control terminal are sequentially connected. The invention can monitor cultural relics in the collection room of the library, and can prevent the stealing of the cultural relics and the monitoring and alarming of harmful organisms.)

1. The utility model provides an indoor context security protection optical fiber sensing system which characterized in that includes:

the light source is used for providing light waves of a measurement signal carrier for the whole security optical fiber sensing system;

the optical fiber beam splitter is used for realizing light signal splitting output by the light source;

the optical fiber geophone receives an external vibration signal;

the photoelectric detector is used for converting the optical signal output by the optical fiber geophone into an electrical signal;

the demodulation module is used for converting the electric signal obtained by the photoelectric detector into a vibration signal;

the signal processing module is used for converting the vibration signal obtained by the demodulation module into alarm information;

the display control terminal is used for displaying the alarm information of the signal processing module;

the optical fiber beam splitter is connected with the plurality of optical fiber geophones, the plurality of optical fiber geophones are connected with the photoelectric detector, and the photoelectric detector, the demodulation module, the signal processing module and the display control terminal are sequentially connected.

2. The optical fiber sensing system for indoor context security and protection according to claim 1, wherein one optical fiber geophone is placed in each context cabinet, and one optical fiber geophone is placed on the ground.

3. An indoor context security and protection optical fiber sensing system according to claim 2, wherein a vibration damping structure is arranged at the bottom of each context cabinet.

4. The optical fiber sensing system for indoor context security and protection according to claim 3, wherein the vibration damping structure is a vibration isolation sponge.

5. The optical fiber sensing system for indoor context security and protection according to claim 1, wherein the light source is an ultra-narrow line width light source.

6. The optical fiber sensing system for indoor context security and protection according to claim 1, wherein the optical fiber splitter is a 1-to-8 PLC splitter.

7. The optical fiber sensing system for indoor context security according to claim 1, wherein the type of the optical fiber geophone is an interferometric type optical fiber geophone.

8. A monitoring method using the indoor cultural relics security protection optical fiber sensing system as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:

s10, deploying an indoor cultural relic security optical fiber sensing system;

s20, placing the simulation target outside the cultural relic cabinet, and calculating a test result G_iiWherein i is the number of the cultural relic cabinet;

s30, placing the simulation target in the cultural relic cabinet, and calculating a test result B_iiWherein i is the number of the cultural relic cabinet;

s40, closing the simulation target, and calculating the test result Q in the quiet environment_iiWherein i is the number of the cultural relic cabinet;

s50, determining a threshold M, N according to actual requirements, and ensuring that the value of the threshold M, N meets G_ii≤M+Q_ii≤Q_ii、Q_ii≤N+Q_ii≤B_ii；

S60, calculating a real-time frame test result W_iiWherein i is the number of the cultural relic cabinet;

s70, comparing the real-time frame test result W_iiAnd M + Q_ii、N+Q_iiThereby judging the alarm condition.

Technical Field

The invention belongs to the technical field of optical fiber sensing, and particularly relates to an indoor text security optical fiber sensing system and a monitoring method.

Background

The optical fiber geophone is a novel vibration sensor based on an optical fiber sensing technology, adopts an inertial accelerometer to pick up vibration signals, utilizes an optical coherence detection technology to realize signal detection, has the characteristics of high sensitivity, easiness in networking, electromagnetic interference resistance and the like, and has wide application prospects in the fields of ground protection, boundary early warning, cultural relic security protection, seismic wave detection and the like.

With the continuous maturity of optical fiber and optical fiber sensing technology, the application of optical fiber geophones is rapidly developed. A perimeter security system based on an optical fiber sensing technology is gradually valued by people in the security field, in the existing cultural relic security system, the traditional sensing means comprises infrared correlation, an electronic fence and the like, but the existing means has the defects of low concealment, insufficient anti-interference capability, low sensitivity and the like, and finally, important cultural relics are stolen or damaged by harmful organisms, so that huge economic loss is caused.

Therefore, how to provide an indoor cultural relic security protection optical fiber sensing system with strong anti-interference capability and higher sensitivity is a problem to be solved urgently by the technical field.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an indoor cultural relic security protection optical fiber sensing system so as to solve the problem that the cultural relic is damaged due to the weak anti-interference capability and low sensitivity of the cultural relic security protection optical fiber sensing system in the prior art; in addition, the invention also provides a monitoring method adopting the indoor cultural relic security optical fiber sensing system.

In order to solve the technical problems, the invention adopts the following technical scheme:

in a first aspect, the present invention provides an optical fiber sensing system for indoor security of a document, comprising: the light source is used for providing light waves of a measurement signal carrier for the whole security optical fiber sensing system; the optical fiber beam splitter is used for realizing light signal splitting output by the light source; the optical fiber geophone receives an external vibration signal; the photoelectric detector is used for converting the optical signal output by the optical fiber geophone into an electrical signal; the demodulation module is used for converting the electric signal obtained by the photoelectric detector into a vibration signal; the signal processing module is used for converting the vibration signal obtained by the demodulation module into alarm information; the display control terminal is used for displaying the alarm information of the signal processing module; the optical fiber beam splitter is connected with the plurality of optical fiber geophones, the plurality of optical fiber geophones are connected with the photoelectric detector, and the photoelectric detector, the demodulation module, the signal processing module and the display control terminal are sequentially connected.

Furthermore, one optical fiber geophone is placed in each cultural relic cabinet, and one optical fiber geophone is placed on the ground.

Furthermore, a vibration damping structure is arranged at the bottom of each file cabinet.

Further, the vibration damping structure is a vibration isolation sponge.

Further, the light source is an ultra-narrow linewidth light source.

Further, the optical fiber beam splitter is a 1-to-8 PLC beam splitter.

Furthermore, the type of the optical fiber geophone is an interference type optical fiber geophone.

In a second aspect, the invention further provides a monitoring method using the indoor cultural relic security optical fiber sensing system, which comprises the following steps:

s10, deploying an indoor cultural relic security optical fiber sensing system;

s20, placing the simulation target outside the cultural relic cabinet, and calculating a test result G_iiWherein i is the number of the cultural relic cabinet;

s30, placing the simulation target in the cultural relic cabinet, and calculating a test result B_iiWherein i is the number of the cultural relic cabinet;

s40, closing the simulation target, and calculating the test result Q in the quiet environment_iiWherein i is the number of the cultural relic cabinet;

s50, determining a threshold M, N according to actual requirements, and ensuring that the value of M, N meets G_ii≤M+Q_ii≤Q_ii、Q_ii≤N+Q_ii≤B_ii；

S60, calculating a real-time frame test result W_iiWherein i is the number of the cultural relic cabinet;

s70, comparing the real-time frame test result W_iiAnd M + Q_ii、N+Q_iiThereby judging the alarm condition.

Compared with the prior art, the indoor cultural relic security protection optical fiber sensing system and the monitoring method provided by the invention at least have the following beneficial effects:

the invention has high concealment, strong anti-interference capability and high detection precision, and can monitor the cultural relics in the collection room, prevent the stealing of the cultural relics and monitor and alarm the harmful organisms.

Drawings

In order to illustrate the solution of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are some embodiments of the invention, and that other drawings may be derived from these drawings by a person skilled in the art without inventive effort.

Fig. 1 is a schematic structural diagram of an indoor article security optical fiber sensing system according to an embodiment of the present invention;

fig. 2 is a schematic overall deployment diagram of an indoor text security optical fiber sensing system according to an embodiment of the present invention;

fig. 3 is a schematic diagram of the indoor deployment of a cultural relic cabinet of an indoor cultural relic security optical fiber sensing system according to an embodiment of the present invention;

fig. 4 is an alarm strategy diagram of a monitoring method of an indoor text security optical fiber sensing system according to an embodiment of the present invention;

fig. 5 is an excitation curve diagram corresponding to three cases of an alarm in a cabinet, a quiet environment, and an alarm in a room, which are actually acquired by the indoor text security optical fiber sensing system according to the embodiment of the present invention.

Detailed Description

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 presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, e.g., the terms "length," "width," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., refer to an orientation or position based on that shown in the drawings, are for convenience of description only and are not to be construed as limiting of the present disclosure.

The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the description of the above figures are intended to cover non-exclusive inclusions; the terms "first," "second," and the like in the description and in the claims, or in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. In the description and claims of the present invention and in the description of the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it may be directly or indirectly located on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.

Furthermore, reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The invention provides an indoor cultural relic security optical fiber sensing system which is applied to the protection and alarm of indoor cultural relics, and comprises: the light source is used for providing light waves of a measurement signal carrier for the whole security optical fiber sensing system; the optical fiber beam splitter is used for realizing light signal splitting output by the light source; the optical fiber geophone receives an external vibration signal; the photoelectric detector is used for converting the optical signal output by the optical fiber geophone into an electrical signal; the demodulation module is used for converting the electric signal obtained by the photoelectric detector into a vibration signal; the signal processing module is used for converting the vibration signal obtained by the demodulation module into alarm information; the display control terminal is used for displaying the alarm information of the signal processing module; the optical fiber beam splitter is connected with the plurality of optical fiber geophones, the plurality of optical fiber geophones are connected with the photoelectric detector, and the photoelectric detector, the demodulation module, the signal processing module and the display control terminal are sequentially connected.

The invention can monitor cultural relics in the collection room of the library, and can prevent the stealing of the cultural relics and the monitoring and alarming of harmful organisms.

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

The invention provides an indoor cultural relic security optical fiber sensing system, which is used for protecting and alarming indoor cultural relics, and as shown in figure 1, the indoor cultural relic security optical fiber sensing system comprises: the light source is used for providing light waves of a measurement signal carrier for the whole security optical fiber sensing system; the optical fiber beam splitter is used for realizing optical signal splitting of an external light source and is a 1-to-8 PLC beam splitter; the optical fiber geophone is an interference type optical fiber geophone and is used for receiving an external vibration signal; the photoelectric detector is used for converting the optical signal into an electric signal; the demodulation module is used for converting the electric signal obtained by the photoelectric detector into a vibration signal; the signal processing module is used for converting the vibration signal obtained by the demodulation module into alarm information; the display control terminal is used for receiving the alarm information of the signal processing module; the optical fiber beam splitter is connected with the eight optical fiber geophones, the eight optical fiber geophones are connected with the photoelectric detector, and the photoelectric detector, the demodulation module, the signal processing module and the display control terminal are sequentially connected.

Further, in this embodiment, as shown in fig. 2, only four optical fiber geophones are applied to one room, a first document cabinet, a second document cabinet and a third document cabinet are arranged in one room, each document cabinet is provided with one optical fiber geophone, and the floor of the room is also provided with one optical fiber geophone, which is beneficial to ensuring the detection accuracy.

Further, in this embodiment, with reference to fig. 2 and 3, a vibration damping structure is disposed below the optical fiber geophone in the document cabinet, and the vibration damping structure is beneficial to vibration isolation of the document cabinet, so as to ensure isolation of a ground signal from a vibration signal in the document cabinet, thereby ensuring accuracy of detection.

In this embodiment, the vibration damping structure is a vibration isolation sponge; in other embodiments, the vibration reduction structure may also be a rubber pad or a mechanical vibration isolation device.

The indoor cultural relic security protection optical fiber sensing system is convenient to deploy and high in anti-interference capacity, and the condition in a room can be monitored in real time by installing the optical fiber geophone in the cultural relic cabinet and on the ground, and meanwhile, the cultural relic cannot be damaged.

The embodiment of the invention also provides a monitoring method adopting the indoor cultural relic security protection optical fiber system, which comprises the following steps:

s10, deploying an indoor cultural relic security optical fiber sensing system;

specifically, with reference to fig. 1, 2 and 3, an optical fiber geophone is respectively installed in a first file cabinet, a second file cabinet and a third file cabinet in a room and on the ground, and the optical fiber geophones in the first file cabinet, the second file cabinet and the third file cabinet and the optical fiber geophones on the ground thereof are ensured, as shown in fig. 2, four optical fiber geophones, a photoelectric detector, a demodulation module, a signal processing module and a display control terminal are sequentially connected;

s20, placing the simulation target outside the cultural relic cabinet, and calculating a test result G_iiWherein i is the number of the cultural relic cabinet;

in particular toAs shown in fig. 2, the signals output by the fiber-optic geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground are respectively defined as y₁(t)、y₂(t)、y₃(t)、y₄(t), placing a simulation target at the No. 1 ground position, wherein the output signal of the simulation target is y_{out_1}(t), the power spectral density of the optical fiber geophone in the first historical relic cabinet can be calculated to be S_{out1_1}(w) the power spectral density of the optical fiber geophone on the ground is S_{out1_4}(w) based on the power spectral density, the result G can be calculated for a simulated target in the ground position 1₁₁(w)＝10*log10(S_{out1_1}(w))-10*log10(S_{out1_4}(w)); and the result is that when the No. 2 ground position is calculated in sequence as follows: g₂₂(w)＝10*log10(S_{out2_2}(w))-10*log10(S_{out2_4}(w)) and ground position No. 3 with a simulation target the results are: g₃₃(w)＝10*log10(S_{out3_3}(w))-10*log10(S_{out3_4}(w))；

G is obtained by step S20₁₁(w)、G₂₂(w)、G₃₃(w), taking the specified bandwidth [ Freq _ a, Freq _ b [ [ Freq _ a ] ], Freq _ b ]]Internally obtained G₁₁(w)、G₂₂(w)、G₃₃(w) mean values of G₁₁、G₂₂、G₃₃；

S30, placing the simulation target in the cultural relic cabinet, and calculating a test result B_iiWherein i is the number of the cultural relic cabinet;

specifically, as shown in fig. 2, the signals output by the fiber-optic geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground are respectively defined as y₁(t)、y₂(t)、y₃(t)、y₄(t), placing a simulation target in the first cultural relic cabinet, wherein the output signal of the simulation target is y_{in_1}(t), the power spectral density of the optical fiber geophone in the first historical relic cabinet can be calculated to be S_{in1_1}(w) the power spectral density of the optical fiber geophone on the ground is S_{in1_4}(w) calculating the result B when the simulation target exists in the first cultural relic cabinet based on the power spectral density₁₁(w)＝10*log10(S_{in1_1}(w))-10*log10(S_{in1_4}(w)); the same operations can be based onAnd the result is calculated when the simulation target exists in the second cultural relic cabinet: b is₂₂(w)＝10*log10(S_{in2_2}(w))-10*log10(S_{in2_4}(w)) and the results with the simulation target in the third file cabinet are as follows: b is₃₃(w)＝10*log10(S_{in3_3}(w))-10*log10(S_{in3_4}(w))；

B is obtained by step S30₁₁(w)、B₂₂(w)、B₃₃(w), taking the specified bandwidth [ Freq _ a, Freq _ b [ [ Freq _ a ] ], Freq _ b ]]Internally obtained B₁₁(w)、B₂₂(w)、B₃₃(w) mean values of B₁₁、B₂₂、B₃₃；

S40, closing the simulation target, and calculating the test result Q in the quiet environment_iiWherein i is the number of the cultural relic cabinet;

specifically, as shown in fig. 2, in a quiet environment, the signals output by the fiber optic geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground are respectively defined as y₁(t)、y₂(t)、y₃(t)、y₄(t), the power spectral densities of the optical fiber geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground can be respectively calculated as follows: s_{quiet1_1}(w)、S_{quiet1_2}(w)、S_{quiet1_3}(w)、S_{quiet1_4}(w) calculating the result of the first historical relic cabinet in the corresponding calculation quiet environment as Q based on the power spectral density₁₁(w)＝10*log10(S_{quiet1_1}(w))-10*log10(S_{quiet1_4}(w)), the result of the second cultural relic cabinet in the quiet computing environment is Q₂₂(w)＝10*log10(S_{quiet2_2}(w))-10*log10(S_{quiet2_4}(w)), the result of the third cultural relic cabinet in the quiet computing environment is Q₃₃(w)＝10*log10(S_{quiet3_3}(w))-10*log10(S_{quiet3_4}(w))；

Q is obtained by step S40₁₁(w)、Q₂₂(w)、Q₃₃(w), taking the specified bandwidth [ Freq _ a, Freq _ b [ [ Freq _ a ] ], Freq _ b ]]Internally obtained Q₁₁(w)、Q₂₂(w)、Q₃₃(w) mean values of Q₁₁、Q₂₂、Q₃₃；

S50, determining a threshold M, N according to actual requirements, and ensuring the instituteThe value of the threshold M, N satisfies G_ii≤M+Q_ii≤Q_ii、Q_ii≤N+Q_ii≤B_ii；

Through multiple measurement comparison, G is obtained₁₁≤Q₁₁≤B₁₁，G₂₂≤Q₂₂≤B₂₂，G₃₃≤Q₃₃≤B₃₃Recording the result of the simulation target outside the No. i cultural relic cabinet as G_iiRecording that there is simulation target result in No. i cultural relic cabinet as B_iiIn the quiet environment, the result of the No. i cultural relic cabinet is Q_iiFrom this, G is known_ii≤Q_ii≤B_iiIn conjunction with fig. 4 and 5, it is ensured that the value of M, N satisfies G_ii≤M+Q_ii≤Q_ii、Q_ii≤N+Q_ii≤B_ii；

S60, calculating a real-time frame test result W_iiWherein i is the number of the cultural relic cabinet;

specifically, as shown in fig. 2, the signals output by the fiber optic geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground are respectively defined as y₁(t)、y₂(t)、y₃(t)、y₄(t), the power spectral densities of the optical fiber geophones in the first file cabinet, the second file cabinet, the third file cabinet and the ground can be respectively calculated as follows: s_{actual1_1}(w)、S_{actual1_2}(w)、S_{actual1_3}(w)、S_{actual1_4}(W) calculating the real-time result in the corresponding first historical relic cabinet to be W based on the power spectral density₁₁(w)＝10*log10(S_{actual1_1}(w))-10*log10(S_{actual1_4}(W)) and the real-time result in the second cultural relic cabinet is W₂₂(w)＝10*log10(S_{actual2_2}(w))-10*log10(S_{actual2_4}(W)) and the real-time result in the third cultural relic cabinet is W₃₃(w)＝10*log10(S_{actual3_3}(w))-10*log10(S_{actual3_4}(w))；

The real-time calculation step obtains W₁₁(w)、W₂₂(w)、W₃₃(w), taking the specified bandwidth [ Freq _ a, Freq _ b [ [ Freq _ a ] ], Freq _ b ]]Internally obtained W₁₁(w)、W₂₂(w)、W₃₃(W) mean values are each W₁₁、W₂₂、W₃₃(ii) a Recording the real-time calculation result in the No. i cultural relic cabinet as W_ii；

S70, comparing the real-time frame test result W_iiAnd M + Q_ii、N+Q_iiSo as to judge the alarm condition;

in particular, W obtained in real time is compared_iiAnd M + Q_ii、N+Q_iiSo as to judge whether the alarm comes from the room or the document cabinet, if W_ii＜M+Q_iiIf so, alarm information exists on the ground of the room outside the cultural relic cabinet; if W_ii∈[M+Q_ii，N+Q_ii]If yes, no alarm information exists; if W_ii＞N+Q_iiAnd the alarm information is in the cabinet.

The monitoring method of the indoor cultural relic security protection optical fiber sensing system has the advantages of simple process and convenient detection, well outputs the conditions of the warning in the cultural relic cabinet and the warning in the room by placing the simulation target on the ground inside and outside the cultural relic cabinet, and effectively prevents the stealing of the cultural relics and the monitoring and warning of harmful organisms.

It is to be understood that the above-described embodiments are merely preferred embodiments of the present invention, and not all embodiments are shown in the drawings, which are set forth to limit the scope of the invention. This invention may be embodied in many different forms and, on the contrary, these embodiments are provided so that this disclosure will be thorough and complete. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and modifications can be made, and equivalents may be substituted for elements thereof. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.