KR20150005313A - Infra-red Laser Device for inspection - Google Patents

Infra-red Laser Device for inspection Download PDF

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Publication number
KR20150005313A
KR20150005313A KR20130079108A KR20130079108A KR20150005313A KR 20150005313 A KR20150005313 A KR 20150005313A KR 20130079108 A KR20130079108 A KR 20130079108A KR 20130079108 A KR20130079108 A KR 20130079108A KR 20150005313 A KR20150005313 A KR 20150005313A
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KR
South Korea
Prior art keywords
laser
infrared
light source
output
diffuser
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KR20130079108A
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Korean (ko)
Inventor
리 조나단
Original Assignee
리 조나단
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Priority to KR20130079108A priority Critical patent/KR20150005313A/en
Publication of KR20150005313A publication Critical patent/KR20150005313A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)

Abstract

The present invention relates to an infrared laser monitoring apparatus, and more particularly, to an infrared laser monitoring apparatus capable of protecting a subject of a laser light source while maintaining surveillance when a person comes near a laser light source will be.
The present invention relates to an infrared laser monitoring apparatus, comprising: an infrared camera including a series of lenses for photographing a subject to output an image and for zooming; An infrared ray diverging means for irradiating infrared rays to a subject of the infrared camera, the infrared ray diverting means including a laser light source and a group of lenses for adjusting a focus of infrared rays output from the laser light source; Sensing means for sensing movement within a predetermined distance from the infrared diverging means; A laser attenuating means for lowering the energy of the laser output from the infrared ray diverging means to a predetermined level or lower when a motion is sensed by the sensing means; And a control unit for controlling the infrared camera, the infrared ray diverging unit, the sensing unit, and the laser attenuation unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an infrared laser device,

The present invention relates to an infrared laser monitoring apparatus, and more particularly, to an infrared laser monitoring apparatus capable of protecting a subject of a laser light source while maintaining surveillance when a person comes near a laser light source will be.

In order to shoot a subject without a light source such as sunlight, it is necessary to use an artificial light source. If you need to shoot a specific area at night, such as a surveillance camera, if you use visible light for such an artificial light source, you can not expect a surveillance effect because the observer can confirm the light source in advance, There is a drawback that there is a limitation in the visible distance that can be secured by visible light, and the like.

In order to solve the problem of using visible light as an artificial light emitting source, a technique of using infrared rays as an artificial light emitting source has been developed, and a technology using a laser diode (LD) and a technology using a light emitting diode And each technology has advantages and disadvantages relative to other technologies.

The infrared ray illuminating apparatus of the related art has a problem in that the divergence angle of the infrared ray is fixed so that the infrared ray is concentrated at the position of the subject and the illumination efficiency with respect to the subject is deteriorated. In order to solve such a problem, Korean Patent No. 10-518250 and Korean Patent No. 10-537050 have been developed. In both cases, the irradiation angle of the infrared light source is adjusted by using a lens to focus infrared rays on the subject So that it can be investigated. However, even when the LED is used as an infrared light source, the light power to be provided by one LED light source is very small, so that a large number of LED light sources are required to monitor a large area. Especially, Will be bigger. Therefore, in the case of using multiple LEDs, it is very cumbersome and expensive to control the divergence angle of the light source by attaching the lens to each LED.

Therefore, an infrared laser monitoring apparatus using a laser as an infrared light source has been introduced and used.

However, when laser light is irradiated to a person or object far away, the output of the laser must be increased. If such a high-power laser is irradiated to a person at a close distance, the laser may cause fatal damage to the skin or eyes of the person It is possible. Laser damage to the skin or eyes is due to the thermal effect.

One of the indicators related to the safety of the laser is the NOHD (Nominal Ocular Hazard Distance), which is defined as the distance from the laser source where the intensity or energy is within the maximum permissible exposure (MPE). In this case, the MPE is defined as the energy intensity (W / cm 2 or J / cm 2 ) that is considered to be safe because the possibility of damage is very low.

Based on these NOHDs and MPEs, lasers are classified into four categories, which have been defined since the 1970s. Laser is classified into class 1 to class 4 depending on degree of damage to exposed person. In case of class 1, it means laser which does not cause damage to human in daily use. In case of class 4, It means the level of serious damage. The criteria for the classification of the laser was revised in 2002 as the research on the damage by the laser proceeded and the research result accumulated. The criteria for laser damage can be found at Wikipedia (http://en.wikipedia.org/wiki/Laser_safety#Maximum_permissible_exposure).

If there is a person exposed to the laser at a certain distance from the laser light source, damage due to the laser may occur. Therefore, countermeasures are needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laser light source that detects a person within a predetermined distance from the laser light source, And to provide an infrared laser monitor capable of irradiating the infrared laser.

As a means for solving the above-mentioned problems,

In an infrared laser monitoring apparatus,

An infrared camera that photographs a subject to output an image, and includes a series of lenses for a zoom function;

An infrared ray diverging means for irradiating infrared rays to a subject of the infrared camera, the infrared ray diverting means including a laser light source and a group of lenses for adjusting a focus of infrared rays output from the laser light source;

Sensing means for sensing movement within a predetermined distance from the infrared diverging means;

A laser attenuating means for lowering the energy of the laser output from the infrared ray diverging means to a predetermined level or lower when a motion is sensed by the sensing means; And

And a control unit for controlling the infrared camera, the infrared ray diverging unit, the sensing unit, and the laser attenuation unit.

Wherein the laser weakening means comprises:

It is preferable that the lens unit is a lens moving unit for moving a lens group that enlarges an irradiation angle of the laser beam emitted through the infrared ray diverging unit and a lens of a part of the lens group,

A diffuser for emitting infrared light emitted from the laser light source,

And a diffuser driving means for moving the diffuser between a position where the diffuser emits infrared light output from the laser light source and a position where the diffuser can radiate the infrared light, and the diffuser driving means may be controlled by the control unit.

The laser attenuation means may be an output control unit for reducing the output of the laser light source.

According to the present invention, it is possible to provide an infrared laser monitoring apparatus capable of monitoring a person without a damage to the eyes or the skin of the person when a person is recognized from a laser light source at a short distance.

1 is a schematic block diagram of an infrared laser monitoring apparatus according to an embodiment of the present invention;
Figs. 2 and 3 are diagrams for explaining that the output of the laser is weakened by one embodiment of the laser weakening means. Fig.
4A and 4B are views for explaining an example of driving a diffuser.
5 is a schematic block diagram of an infrared laser monitoring apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, and specific details for implementing the present invention are provided.

FIG. 1 is a schematic block diagram of an infrared laser monitoring apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining that laser output is weakened by one embodiment of a laser attenuating means, 4A and 4B are views for explaining an example of driving the diffuser.

The infrared laser monitoring apparatus according to the present embodiment includes an infrared camera 10, an infrared ray diverging unit 20, a detecting unit 30, a laser attenuating unit, and a control unit 50.

The infrared camera 10 is configured to take an image of a subject and output an image, and is configured to respond to infrared light, not visible light. The infrared camera 10 includes a series of lenses 11 for a zoom function. The lens 11 is composed of a combination of a concave lens and a convex lens and includes drive means for changing the position of the lens for zooming . In the drawing, the lens 11 is shown in a dotted box form, which is briefly shown for convenience of illustration, and is not actually a box shape but a combination of a concave lens and a convex lens as described above.

The infrared ray diverting means 20 includes a laser light source 21 and a group of lenses 22 for adjusting the focal point of infrared rays outputted from the laser light source 21 to irradiate the subject of the infrared camera 10 with infrared rays, .

The sensing means 30 may be a pyroelectric infrared sensor, which is generally used to detect movement within a predetermined distance from the infrared ray diverting means 20. [ The distance setting can be in the range of 3 meters to 5 meters. As it is well known, the infrared sensor detects the change of the infrared ray. When the change of the infrared ray is detected within the set distance, it is judged that the person is within the set distance.

The laser attenuating means is configured to lower the energy of the laser output from the infrared ray diverging means to a predetermined level or less when a motion is sensed by the sensing means (30). The energy outputted from the infrared ray diverging means means the energy of the laser which is emitted from the laser light source 21 and passes through the lens 22 and finally exits to the outside of the infrared ray monitoring apparatus.

As the preset reference, class 1 of the MPE described in the background art (a laser which does not cause harm to the human body during daily use) is suitable.

It is most preferable to not irradiate the laser when the person (movement) is sensed by the sensing means 30, but when the laser is turned off at night, the person can not be photographed by the infrared camera, It is necessary to lower the output of the laser to such an extent that no damage is caused to the eyes or the skin of the human being while taking an image with the infrared camera because a problem may occur in the case of an intruder.

In this embodiment, the lens weakening means 40 uses the lens moving means, the diffuser 41 and the diffuser driving means.

The lens moving means may be configured to appropriately adjust the distance between the lenses 22 of the infrared ray diverging means, and the lens moving means may appropriately use the configuration for moving the lens 22 for zooming.

FIG. 2 and FIG. 3 are views showing a method of dropping the level of the laser output by the lens moving means. FIG. In Fig. 2, the angle (? 1 ) at which the laser is spread out is relatively small, and the spreading angle may be smaller than the illustrated angle in order to focus on a distant object. Fig. 2 shows how the laser spreads when monitoring an object. In contrast, FIG. 3 shows a state in which the output of the laser is dropped. Since the angle (? 2 ) at which the laser is spread out is very large, the size of the laser irradiated per unit area can be reduced, It will be reduced. At this time, the angle (? 2 ) shown in the figure (FIG. 3) is larger than that of FIG. 2, and may be wider according to the magnitude of the output of the laser light source or the MPE standard.

The diffuser 41 is a structure used for controlling the spark phenomenon, which is one of the characteristics of the laser. The spark phenomenon refers to a phenomenon in which a relatively high-level laser beam is irradiated and a relatively low laser beam is irradiated rather than a laser beam is irradiated uniformly due to the coherence of the laser. The laser beam passing through the diffuser 41 is irradiated uniformly. It is to uniformly irradiate the laser. It is expected that the laser level is partially lowered while passing through the diffuser 41 with water. If a diffuser is not used, a relatively high-level laser may be irradiated to human eyes or skin. In such a case, even if the laser level is lowered as a whole, damage to human eyes or skin may occur. ) To reduce the possibility of such problems. As the diffuser 41, a glass slab can be used.

The diffuser driving means moves the diffuser between a position where the diffuser can pass through the diffuser and a position at which the laser can be irradiated without passing through the diffuser by placing the diffuser in front of the laser light source as shown in FIG. In this embodiment, the motor 42 and the diffuser holding means 43 are provided.

4A and 4B, the diffuser grasping means 43 is connected to the motor 42 to grasp the diffuser 41. The diffuser grasping means 43 is disposed at a position shown in Fig. 4A by the rotation of the rotation shaft of the motor 42 And the diffuser 41 is moved between the positions shown in Fig. 4B.

The diffuser driving means described above is merely one example, and may be a rectilinear motion instead of the rotational motion shown in the drawing. For this purpose, a configuration using a motor and a cam, or a linear motor or the like may be utilized.

The control unit 50 controls the infrared camera 10, the infrared ray diverting unit 20, the detecting unit 30, and the laser attenuation unit.

The operation of the above-described configuration will be briefly described as follows.

First, when the movement is detected by the detection means (PIR sensor), the laser weakening means is operated by the control section. The position of the diffuser 41 is moved by the diffuser driving means to the position where the laser passes through the diffuser 41 and the lens 22 is moved appropriately so that the laser spreads wide enough not to be damaged by human eyes or skin . This mechanism reduces the intensity of the laser directly irradiated to the person.

Hereinafter, another embodiment of the present invention will be described to provide another method for practicing the present invention.

5 is a schematic block diagram of an infrared laser monitoring apparatus according to another embodiment of the present invention.

Since the configuration of this embodiment is almost the same as that of the foregoing embodiment and only the laser attenuation means is different, the description of the substantially same configuration as that of the foregoing embodiment is simply made.

As shown in FIG. 5, the infrared laser monitoring apparatus according to the present embodiment includes an infrared camera 110, an infrared ray diverging unit 120, a detecting unit 130, a laser attenuating unit, and a controller 150.

The infrared camera 110 includes a series of lenses 111, and photographs a subject to output an image.

The infrared ray diverting unit 120 includes a laser light source 121 and a lens 122 and emits infrared rays to a subject of the infrared ray camera 110. [

The sensing means 130 senses a movement within a predetermined distance from the infrared ray diverging means 120.

The laser attenuating means is configured to reduce the energy of the laser output from the infrared ray diverging means to a predetermined level or less when the motion is sensed by the sensing means 130. In this embodiment, the output control portion 141 is used.

The criteria for reducing the energy of the laser have been described in the above embodiments, and a detailed description thereof will be omitted. The output controller 141 is configured to reduce the output of the laser beam emitted from the laser light source. If the number of the laser light sources is plural, the laser output from the laser light source is reduced by a method of cutting off the power supply to a part of the laser light source.

The control unit 150 appropriately controls the infrared camera 110, the infrared ray diverging unit 120, the sensing unit 130, and the laser attenuation unit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And may be embodied in various forms of infrared laser monitoring devices within the range.

10: infrared camera 20: means for emitting infrared rays
30: sensing means 50:

Claims (4)

In an infrared laser monitoring apparatus,
An infrared camera that photographs a subject to output an image, and includes a series of lenses for a zoom function;
An infrared ray diverging means for irradiating infrared rays to a subject of the infrared camera, the infrared ray diverting means including a laser light source and a group of lenses for adjusting a focus of infrared rays output from the laser light source;
Sensing means for sensing movement within a predetermined distance from the infrared diverging means;
A laser attenuating means for lowering the energy of the laser output from the infrared ray diverging means to a predetermined level or lower when a motion is sensed by the sensing means; And
And a controller for controlling the infrared camera, infrared ray diverting means, sensing means, and laser attenuation means.
The method according to claim 1,
Wherein the laser weakening means comprises:
And a lens moving means for adjusting the position of the lens so that the laser emitted from the infrared ray diverging means spreads out at a large angle.
3. The method of claim 2,
Wherein the laser weakening means comprises:
A diffuser for emitting infrared light emitted from the laser light source,
Further comprising a diffuser driving means for moving the diffuser between a position where the diffuser is capable of emitting infrared light output from the laser light source and a position where the diffuser is capable of emitting infrared light and the diffuser driving means is controlled by the control unit. Device.
The method according to claim 1,
Wherein the laser weakening means comprises:
And an output controller for reducing an output of the laser light source.


KR20130079108A 2013-07-05 2013-07-05 Infra-red Laser Device for inspection KR20150005313A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105025212A (en) * 2015-07-11 2015-11-04 苏州至禅光纤传感技术有限公司 Camera powered by fiber laser
CN114500795A (en) * 2021-12-27 2022-05-13 奥比中光科技集团股份有限公司 Laser safety control method and device, intelligent door lock and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105025212A (en) * 2015-07-11 2015-11-04 苏州至禅光纤传感技术有限公司 Camera powered by fiber laser
CN114500795A (en) * 2021-12-27 2022-05-13 奥比中光科技集团股份有限公司 Laser safety control method and device, intelligent door lock and storage medium
CN114500795B (en) * 2021-12-27 2024-03-15 奥比中光科技集团股份有限公司 Laser safety control method and device, intelligent door lock and storage medium

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