JP2007033256A - Optical intrusion detection module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a component and method for detecting intrusion of an intruder in an intrusion detection section. <P>SOLUTION: This optical intrusion detection module 16 is characterized as follows: one or a plurality of light emitters 2 are arranged at intervals in the longitudinal direction on a support 10 having a shape extended in the longitudinal direction as shown in figure 3; one or a plurality of light receivers 3 are arranged at intervals in the longitudinal direction on the support; a light beam 1 from the light emitter 2 is reflected by an intruder or an intrusion object 11 from the inside/outside of a radiation domain of the light beam 1, and the reflected light is received by the light receiver 3, to thereby detect the intruder or the intrusion object 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This is a light intrusion detection module that detects an intruder or an intruder using reflection of a light beam.

  As shown in FIG. 1, conventionally, a light emitter (electro-optical converter) 2 is installed in an intrusion detection space, and a light beam 1 emitted from the light emitter to the intrusion detection space is received at a detection site. (Photoelectric converter) 3 receives light, converts it into an electrical signal, and detects intrusion by blocking light beam when there is an intruder or intruder in the system that detects light blockage by ON / OFF Was. When it is desired to extend the section, a relay amplifier may be used as shown in FIG. See US Pat.

  The background of the in-vehicle optical laser radar is shown as background technology. As shown in Figure 2, the light beam emitted forward from the light emitter installed at the front of the car is swept (scanned) at an angle Θ, and the time of the reflected light from the object in front is measured, This is a known method for specifying the size of an object and the distance to the object. See Non-Patent Document 1.

Japanese Patent Laid-Open No. 6-6310 Hamamatsu Photonics, Catalog, 2004

Conventionally, a known intrusion detection system as shown in FIG. 1 has a light emitter 2 such as a laser diode or a light emitting diode installed at a detection site, and a light beam 1 radiated from the light emitter 2 to the intrusion detection space. The light is received by the light receiver 3 and converted into an electric signal, and the presence or absence of interruption of the light beam 1 in the intrusion detection section is detected by the presence or absence of the electric signal. In such a system, it takes time for the "on-site alignment work" of the light emitter and the light receiver. In addition, these operations were greatly affected by external environment restrictions such as weather and traffic regulations, and the cost was also increased.
In addition, when the site is curved, the light beam goes straight, so it is necessary to individually install the light emitter 2 and the light receiver 3 along the bends. The alignment work increased and the cost increased.
On the other hand, as shown in FIG. 2, the light source 2 is converted into light parallel by a collimator lens 5 to form a light beam, the light beam is scanned in front by Θ degrees, and the intruder 11 is irradiated to detect reflected light. There are in-vehicle laser radar systems, but intruders and intruders from the lateral direction cannot be detected along the longitudinal direction of railways and roads. Further, the device 8 and the distance measuring device for sweeping the light beam 1 to the left and right are complicated and not economical.

  As shown in FIG. 3, one or more light emitters 2 are arranged on the support 10 having a shape extending in the longitudinal direction with a gap in the longitudinal direction, and the support tool is spaced in the longitudinal direction. One or more light receivers 3 are arranged, and the light beam from the light emitter is reflected from the inside and outside of the radiation region of the light beam to the intruder or the intruder 11, and the reflected light is received by the light receiver 3. The problem is solved by the light intrusion detection module 16 that detects the intruder or the intruder 11 by receiving the light.

Advantages of the “light intrusion detection module” of the present invention (1) Conventionally, in the intrusion detection method shown in FIG. 1, it is necessary to install the light emitter 2 and the light receiver 3 at the intrusion detection site. The light intrusion module of the present invention can be assembled in a factory or the like away from the detection site.
(2) For the above reasons, there is no optical axis alignment work on site, and the influence of the external environment such as weather and road regulations is reduced.
(3) The vehicle-mounted laser radar system shown in FIG. 2 is effective for forward monitoring, but according to the present invention, intruders and intruders are detected and monitored from the lateral direction along the longitudinal direction such as along the railway. can do.
(4) Compared with the in-vehicle laser radar system shown in FIG. 2, a device for sweeping (scanning) the light beam left and right and a device for measuring the distance are not required.
(5) According to the present invention, the detection accuracy is increased by the number of light emitters installed at intervals in the longitudinal direction and the number of light receivers installed at intervals, which is simple and economical.

As shown in FIG. 3, one or more light emitters 2 are arranged on the support 10 having a shape extending in the longitudinal direction at intervals in the longitudinal direction, and the support is spaced apart in the longitudinal direction. One or more light receivers 3 are arranged, and the light beam from the light emitter is reflected from the inside and outside of the radiation region of the light beam to the intruder or the intruder 11, and the reflected light is received by the light receiver 3. The problem is solved by the light intrusion detection module 16 that detects the intruder or the intruder 11 by receiving the light.
As a system that constitutes intrusion detection, one or a plurality of modules in the module include a light emitting device 12 having a power source and a modulator for the light emitter 2, a power source and a demodulator for the light receiver, and the like. In some cases, the receiver device 13 is required, and the monitoring device for the entire system is provided in the center.
The light emitter can be either an LD (laser diode) or an LED (light emitting diode), and the light receiver can be a photodiode, an avalanche photodiode, or the like. A lens such as a collimator lens may be installed in front of the light emitter / receiver. In addition, depending on the installation environment, additional equipment such as waterproof, drip-proof and dust-proof is provided on the front surface of the light emitter and light receiver.
On the other hand, the arrangement relationship between the light emitters 2 and the light receivers 3 may be alternately arranged, may be arranged in groups, and is determined by design.

An application example to an automobile will be described using the light intrusion detection module 16 shown in the paragraph 0008 and FIG. As shown in FIG. 5, when there is an intruder or intruder 11, the light beam 1 of the light intrusion detection module 16 installed at the front of the automobile 20 is reflected by the intruder or intruder 11, and the reflected light is reflected. The intrusion detection controller 17 in the vehicle is actuated by an electric signal (intrusion detection signal) detected by the light receiver 3 and received from the receiver control device 13, and an air bag activation electric signal 22 from the intrusion detection controller 17 is operated. The air bag actuating device 18 is actuated, or the brake actuating device 19 is actuated by the brake actuating signal 23 from the intrusion detection controller 17.
Further, the light intrusion detection module may be arranged around the entire periphery of the automobile.

  As shown in FIG. 6 (a), three LEDs with a wavelength of 0.85 microns and an output of 0 dbm at intervals of 0.4 m from the start of the 2 m support stand are installed at equal intervals in the horizontal and 45 degree directions. The PD is moved in the right direction from the end of the support base to estimate the light reception level (dbm). However, assuming that the width of the railway wide gauge is 1.435 m and the gravel width of the track is about 0.6 m, a cloth is stretched on a plate about 1 m square at a position 2 m from the support base in parallel with the support base. The estimated measurement result is shown in FIG. It can be inferred from the reflectance measurement results of various materials in the optical dictionary that the range of FIG. As a result, when a human is assumed as an intruder, it is presumed that detection is sufficiently possible at a light reception detection limit of −50 dbm.

  The light intrusion detection module according to the present invention detects intrusion into the train track of the transportation industry, safety devices such as revolving doors and automatic opening / closing shutters in the construction industry, and automobile fenders shown in FIG. 5 and (0009). There is a possibility of use in various fields such as safety devices by wearing.

It is explanatory drawing of the conventional light intrusion detection system. It is a principle explanatory view of a well-known in-vehicle laser radar. It is sectional drawing which shows the structure of this invention light intrusion detection module. It is explanatory drawing of the system configuration | structure using the optical intrusion detection module of this invention. It is a system block diagram in the case of applying the present invention to in-vehicle intrusion detection. It is explanatory drawing of the Example for verifying operation | movement of a light intrusion detection system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light beam 2 Light emitter 3 Light receiver 4 Relay amplifier 5 Collimator lens 6 Sheath 7 Half mirror 8 Light beam scanning device 9 Electric wire 10 Core support 11 Intruder or intruder 12 Light emitter controller 13 Light receiver controller 14 Light emitter Wires for control device 15 Wires for light control device for light receiver 16 Light intrusion detection module 17 Intrusion detection device 18 Airbag operation device 19 Brake operation device 20 Car 21 Collision detection signal 22 Airbag operation signal 23 Brake operation signal 24 Pseudo intruder (plate brown cloth)

Claims (1)

  One or a plurality of light emitters are arranged at intervals in the longitudinal direction on a support having an elongated shape in the longitudinal direction, and one or a plurality of light receivers are spaced on the support in the longitudinal direction. The light beam from the light emitter is reflected by the intruder or intruder from the inside and outside of the light beam radiation area, and the reflected light is received by the light receiver to detect the intruder or intruder. A light intrusion detection module.

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