JPS6399631A - Monitoring system - Google Patents

Abstract

PURPOSE:To simplify an optical transmission line and to enhance the miniaturization of the O/E conversion part of a central supervisory part by arranging an optical multiplexing/ switching element which has a function switching an optical path in respective supervisory zones and selecting to command from the central supervisory part. CONSTITUTION:The camera videos in the respective supervisory zones are converted into optical signals whose wavelengths are lambda and lambda2 by an optoelectrical signal converter(O/E converter) 2 and as for the supervisory zone 1 which is the farthest end from the central supervisory part, an optical multiplexer 3 multiplexes the wavelengths of the optical signals whose wavelengths are lambda1 and lambda2 to transmit to the supervisory zone 2 through an optical fiber. As for the supervisory zone 2, the optical multiplexing/switching element 4 selects the optical signals in the supervisory zone 2, whose wavelengths are lambda1 and lambda2, or the optical signals in the supervisory zone 1 through the switching information from the selection unit 8 of the central supervisory part to transmit to the supervisory zone 3 through the optical fiber. Meanwhile, the central supervisory part inputs the optical signals of any supervisory zone from the zone 1 to the zone 4 and separates the optical signal of the wavelength lambda1 from the optical signal of the wavelength lambda2 with the optical multiplexer 5, then reproduces the original video signal in the O/E converter 6 so as to monitor with a receiver 7. Thus, the supervisory system can be realized, whose constitution of the optical transmission line and the central supervisory part is simple.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention collects dispersed monitoring point information for each monitoring area, and transmits information for each monitoring area + 1' according to a control 41 from a central monitoring unit. 31: Concerning the Toho System in Optical Communication.

BACKGROUND OF THE INVENTION For example, in the case of centrally monitoring images of relatively distant points such as traffic monitoring, a plurality of surveillance cameras 1 are installed in each surveillance area as shown in Fig. 6, and the images are monitored by a central monitoring unit. I am doing it. 18j1- As the distance between viewing zones becomes longer, it becomes difficult to transmit data using coaxial cables, so a system using optical fibers has been put into practical use. As described above, wavelength multiplexing technology is used in systems using optical fibers in order to reduce the cost of the system. Each monitoring area 4
σ, the camera image is converted into an optical signal of a predetermined wavelength (λ1, λ2) by an electric/optical signal converter (hereinafter abbreviated as E10 converter) 2, and a multiplexer s K , 1: f) eJ+ It is multiplexed and transmitted to the medium fire monitoring unit via optical fiber. In the central monitoring unit, the wavelength-multiplexed optical signal is split into the original wavelength (λ1, λ2) by a demultiplexer 5 (optical/electrical signal converter (hereinafter abbreviated as O/E converter)). The camera images are reproduced at 66 and \-7 and inputted to the image switching device 14, and the image for each monitoring is selected by the selector 80 command and displayed on the receiver 7 for monitoring.

As described above, according to the conventional technology, the number of monitoring areas and the number of optical fiber lines are required to be the same, and as the number of monitoring areas increases, the number of optical fiber lines also increases, leading to a rise in transmission line costs. Furthermore, as the number of surveillance cameras in each surveillance area increases, the number of O/E converters 6 in the central monitoring section will be the same as the number of surveillance cameras, and the scale of the video switching device 14 will also increase. This has led to the expansion of the market and rising costs. □ Problems to be Solved by the Invention In view of the above-mentioned problems, the present invention provides a simple and low-cost structure for the optical transmission line and the central monitoring section, regardless of the number of monitoring areas and the number of monitoring cameras in each monitoring area. The purpose is to provide a monitoring system.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention arranges optical multiplexing/switching elements with optical path selection functions in each monitoring area and controls switching from a central monitoring unit. In addition to selecting a monitoring area video, the central monitoring unit can share an O/E converter.

Effect of the Invention With the above-described configuration, the present invention can realize a monitoring system with a simple configuration of the optical transmission line and the central monitoring section.

Embodiment FIG. 1 is a book diagram showing this embodiment of the monitoring system of the present invention. 3. The same components as in FIG. 6 are designated by the same numbers. Part of is omitted. The operation will be described below assuming that the number of cameras in each monitoring area is Jl and two. A certain camera image of each monitor 1 is converted to λ1. It is converted into an optical signal of λ1. The optical signal of λ2 divided by 3 is optically wavelength-multiplexed and sent to the monitoring area 2 through the source fiber.

Regarding the monitoring area 2, the optical multiplexing/switching element 4 detects λ1. The optical signal of λ2 or the optical signal of the monitoring area 1 is selected by the switching information M7, - of the selector 8 of the central monitoring section and sent to the monitoring area 3 via an optical fiber.

Similar operations are performed for monitoring area 3 and monitoring area 4.

- The central monitoring unit inputs optical signals from monitoring areas 1 to 4, separates the optical signals of λ1 and λ2 using an optical demultiplexer 5, and outputs the original video signal using a 07E converter 6. play,
Monitor with receiver 7.

Next, the optical multiplexing/switching element 4 selects λ1. λ
The system selects either the optical signal of No. 2 or the optical signal of another monitoring area, and selects the monitoring area by the operation shown in FIG. 2B using a multiplexed signal as shown in FIG. 2 A1≧.

The selection information of the selector 8 is converted into a serial signal by a multiplexer 9, converted into an optical signal by an E10 converter 1o, and transmitted to each monitoring area. In each monitoring area, an optical splitter 11 branches the signal into two, an O/converter 12 regenerates the serial signal, and a multiplexer/separator 13 obtains the original parallel signal.

The optical multiplexing/switching element 4 can be constructed as shown in FIG. 3, for example.

In Fig. 3, 41, 42, and 43 are lenses that convert the optical signal into parallel beams, 44 is a lens that focuses the parallel beams, and 45 is the point J between point a and point B according to the monitoring area selection command from the central monitoring unit.
This is an optical member that is fixed to the I. The optical unit 45 includes a mirror m1 that reflects the parallel light beam of the lens 410 off the optical axis;
Consisting of a mirror m2 that reflects the parallel light flux of the lens 42 in the optical axis direction of the lens 44, and a filter 3 that transmits the reflected light of the mirror m2 and reflects the x17-line likelihood flux of the lens 43 in the optical axis direction of the lens 440. be done. wavelength λ
0 (combined signal of λ1 and λ2) to the lens 41,
The optical signal selection operation when an optical signal with a wavelength λ1 is input to the lens 42 and an optical signal with a wavelength λ2 is input to the lens 43 will be described. 'tJJi, when inputting an optical signal with a long wavelength λQ to the lens 44, the optical member 45 is set at point a, as shown in FIG. As shown in the figure, an optical signal can be selected by moving the optical member 45 to point b, respectively.

Effects of the Invention According to the present invention, an optical multiplexing/switching element having an optical path switching function is arranged in each monitoring area to provide a central monitoring system 9.

By issuing a selection command from the reception section, it is possible to simplify the optical transmission path, and the O/E conversion section of the central monitoring section can be downsized, making it possible to reduce the cost of the system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a monitoring system according to an embodiment of the present invention, FIG. 2 is a frame configuration diagram showing an example of selection command information for optical multiplexing/switching elements, and FIG. 3 is an example optical multiplexing/switching element in the monitoring system. Specific configuration diagram of wave/switch element, Part 4
Figure 6 is an explanatory diagram of the operation of the optical multiplexing/switching element,
FIG. 6 is a block diagram of a conventional monitoring system. 1... Surveillance camera, 2... E10 converter, 3... Optical multiplexer, 4... Optical multiplexer.
Switch element, 5... Optical demultiplexer, 6...
・O/E converter, 7... Receiver, 8...
・Selector, 9... Multiplexer, 1o...
E10 converter, 11... branch, 12...
...O/E converter, 13...Multiplexer/separator. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 2 Figure 4

Claims (4)

[Claims] (1) It has N monitoring areas consisting of a plurality of monitoring blocks and a group of electrical/optical signal converters that convert the monitoring information of the monitoring blocks into optical signals of different wavelengths, and a monitoring area at the far end. An optical multiplexer installed in the monitoring area and (N
-1) The optical multiplexing/switching elements and the optical demultiplexer in the central monitoring section are connected by optical fibers, and the optical multiplexing/switching elements in the relay section are switched based on the monitoring area selection information issued by the central monitoring section. A monitoring system characterized in that an arbitrary monitoring area can be selected by (2) The optical multiplexing/switching element includes a first lens that receives an optical signal of a first wavelength and converts it into a parallel beam, and a lens that is located perpendicular to the optical axis of the first lens and receives an optical signal of a second wavelength. a second lens that inputs an optical signal of a third wavelength and converts it into a parallel beam; a third lens located perpendicular to the optical axis of the first lens inputs an optical signal of a third wavelength and converts it into a parallel beam; a fourth lens that is located horizontally to the optical axis of the lens and focuses a parallel light beam, and a first, second, and third lens.
, a first mirror that is disposed on the optical axis of the fourth lens and reflects the parallel light beam of the first lens off the optical axis; and a first mirror that reflects the parallel light beam of the second lens in the direction of the optical axis of the fourth lens. The optical member is constituted by an optical member having a second mirror that reflects the light, and a filter that reflects the parallel light beam of the third lens in the optical axis direction of the fourth lens and transmits the reflected light of the second mirror. by inserting or removing the second
2. The monitoring system according to claim 1, wherein the multiplexed output of the third wavelength and the optical signal of the first wavelength are selected and focused by a fourth lens. (3) The central monitoring unit includes a selector that issues switching commands to the optical multiplexing/switching elements in the relay unit, a multiplexer that converts the switching information of the selector into a serial signal, and a multiplexer output that converts the output of the multiplexer into an optical signal. An electrical/optical signal converter converts the signals, a demultiplexer separates the optical signals of multiple wavelengths that are information of each monitoring area sent via optical fiber into each wavelength, and a demultiplexer converts the output of the demultiplexer into electrical signals. 2. The monitoring system according to claim 1, comprising an optical/electrical signal converter for converting into a signal and a monitor block. (4) The relay section consists of a brancher that divides the switching information of the optical multiplexing/switching element sent by an optical signal from the central monitoring section into its own relay section and another relay section, and an optical multiplexing/switch that is branched to its own relay section. An optical/electrical signal converter that converts element switching information into electrical signals, a multiplexer/separator that performs serial/parallel conversion and regenerates optical multiplexing/switching element switching information in the own repeater, and A patent claim characterized in that it has an optical multiplexing/switching element that inputs monitoring area information and monitoring area information of other relay parts as optical signals, and selects and outputs one of them based on switching information of the optical multiplexing/switching element. The monitoring system described in Scope 1.