JP2016080629A - Gas leak detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas leak detector capable of efficiently maintaining a gas pipe buried in a road surface.SOLUTION: A gas leak detector 10 includes: an irradiation unit 54 that is installed in a vehicle 20 and radiates a laser beam to each of a plurality of positions on a road surface; a light receiving unit 56 for receiving reflected laser beams reflected at the plurality of positions, of the laser beams radiated from the irradiation unit 54; and a detection unit 58 for detecting the presence/absence of a gas component at each of the plurality of positions, on the basis of the light reception intensity of each of the reflected laser beams received by the light receiving unit 56.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a gas leak detection device.

  At present, in the gas leak inspection on the road surface, as shown in FIG. 12, whether or not the inhaled air contains gas while the inspector pushes the cart type gas leak detection device 6 and sucks air on the road surface. Inspected (see, for example, Patent Document 1). Then, if there is a gas detection reaction, dig up the location where the gas detection reaction occurred, and identify whether the detected gas leaks from the gas pipe 30 or is naturally generated gas in the ground Detailed gas leakage inspection is performed using a high-concentration gas detector with an identification function.

  Further, there is a case where a laser gas sensor is mounted on a vehicle and a laser beam is irradiated on the road surface while traveling with the vehicle to check for gas leakage on the road surface (see, for example, Patent Document 2).

JP-A-5-322688 JP 2009-42965 A

  However, in the method in which the inspector pushes the cart-type gas leak detection device to check for gas leaks on the road surface, for example, if the length of the road surface to be inspected reaches several tens of kilometers, a vehicle is used. Compared with the gas leak inspection on the road surface, the inspection takes time.

  Even when a gas leak inspection is carried out using a vehicle, the conventional inspection method is to irradiate a laser on one point on the road surface, and whether there is a gas leak at multiple points at the same vehicle position. In order to inspect the laser beam, it is necessary to change the laser irradiation position each time.

  Therefore, the present invention, when detecting the presence or absence of gas leakage from the gas pipe embedded in the road surface, maintains the gas pipe embedded in the road surface compared to the case of detecting the presence or absence of gas leakage point by point. An object of the present invention is to provide a gas leak detection device that can be implemented efficiently.

  In order to achieve the above object, a gas leak detection device of the present invention is a gas leak detection device installed on a moving body, and includes an irradiation unit that irradiates a laser to each of a plurality of points on a road surface, and the irradiation unit. Among the irradiated lasers, the presence or absence of a gas component at each of the plurality of points is determined from the light receiving unit that receives each of the reflected lasers reflected at the plurality of points, and the received light intensity of each of the reflected lasers received by the light receiving unit. A detection unit for detecting.

  According to the gas leakage detection device of the present invention, when detecting the presence or absence of gas leakage from the gas pipe embedded in the road surface, compared with the case of detecting the presence or absence of gas leakage point by point, embedded in the road surface Maintenance of the gas pipe can be carried out efficiently.

It is a figure which shows the mode of the gas leak test | inspection using a gas leak detection apparatus. It is a functional block diagram which shows the function of a gas leak detection apparatus. It is a figure explaining the depression angle of a laser. It is a figure explaining the irradiation angle of a laser. It is a figure explaining adjustment of the depression angle of a laser. It is a figure which shows an example of a structure in the case of implement | achieving a gas leak detection apparatus with a computer. It is a flowchart which shows an example of the flow of a gas leak detection process. It is a figure which shows an example of a correction table. It is a figure explaining a correction distance. It is a figure which shows the mode of the gas leak test | inspection which used the suction type gas detector together. It is a figure explaining the path | route of the sucked air. It is a figure which shows a cart type gas leak detection apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is provided to the member and process which a function and an action bear the same function through all the drawings, and the overlapping description may be abbreviate | omitted suitably.

  FIG. 1 is a diagram illustrating a state in which a gas leak inspection is performed on a gas pipe 30 embedded in a road surface using the gas leak detection apparatus 10 according to the present embodiment. As shown in FIG. 1, the gas leak detection device 10 is attached to a vehicle 20, irradiates a road surface with a laser from a laser irradiator 12 provided on the roof of the vehicle 20, and moves on the road surface as the vehicle 20 moves. It is a device that detects the presence or absence of gas leakage in the buried gas pipe 30.

  The gas contains a component containing a so-called CH bond in which carbon and hydrogen are bonded, such as methane and ethane, but it is known that the wavelength of light to be absorbed differs for each component contained in the gas. For example, in the case of methane, which is the most abundant component in the gas, there is a feature that lasers having wavelengths of 1.6 μm and 3.3 μm are more easily absorbed than other wavelengths.

  Therefore, for example, when a laser having a wavelength of 1.6 μm is irradiated from the laser irradiator 12 and the intensity of the laser reflected on the road surface (reflected laser) is lower than a predetermined threshold, there is a possibility of gas leakage. It can be judged that there is. The reason why the wavelength of the laser is 1.6 μm is that a stable output can be obtained more often than a laser having a wavelength of 3.3 μm.

  FIG. 2 is a functional block diagram showing functions of the gas leak detection apparatus 10.

  The gas leak detection device 10 includes, for example, a reception unit 50, a drive unit 52, an irradiation unit 54, a light receiving unit 56, a detection unit 58, a measurement unit 60, a specifying unit 62, and a display unit 64.

  The receiving unit 50 includes an input member such as a switch, for example, receives an instruction from the inspector according to a setting state of the input member, and notifies the driving unit 52 of the instruction. The instruction from the inspector includes, for example, a gas leakage detection start instruction for starting detection of gas leakage, a gas leakage detection end instruction for ending detection of gas leakage, and a depression angle for specifying the depression angle of the laser emitted from the irradiation unit 54 Setting instructions and the like are included. Here, as shown in FIG. 3, the depression angle is an angle γ formed by a laser irradiated on the road surface from the laser irradiator 12 and a surface that is parallel to the road surface and passes through the laser irradiation start point. Say.

  The drive unit 52 includes, for example, a motor and the like, and the rotation angle of the laser irradiated from the irradiation unit 54 by driving the attachment member of the laser light emitting element in the irradiation unit 54 connected through a gear or the like by rotating the motor. Is adjusted to be the depression angle notified from the reception unit 50, and the depression angle information notified from the reception unit 50 is notified to the identification unit 62.

  The drive unit 52 includes a switching element that drives the laser light emitting element in the irradiation unit 54 on and off. When the gas leakage detection start instruction is notified from the receiving unit 50, the driving unit 52 drives the switching element to turn on, thereby emitting laser light. Laser is emitted from the element. On the other hand, the drive unit 52 stops the laser emitted from the laser light emitting element by driving the switching element off when the gas leakage detection end instruction is notified from the reception unit 50.

  The irradiation unit 54 irradiates the road surface with a laser having a predetermined intensity at a timing designated by the driving unit 52 from a plurality of laser light emitting elements attached to the laser irradiator 12, for example. Although the height from the road surface to the laser light emitting element is fixed, the drive unit 52 has a function of moving the laser irradiator 12 in the height direction of the vehicle 20 in accordance with an instruction from the inspector. The height from the road surface to the laser light emitting element may be adjusted.

  FIG. 4 is a diagram for explaining the irradiation state of the laser irradiated from the laser irradiator 12, and is a view of the vehicle 20 viewed from the sky toward the road surface.

  As shown in FIG. 4, the irradiating unit 54 does not irradiate a single point on the road surface with a laser, but irradiates a laser beam to a different point on the road surface from each laser light emitting element, thereby simultaneously irradiating a plurality of points on the road surface. Irradiate laser. Therefore, each laser light emitting element is attached to the laser irradiator 12 at a predetermined irradiation angle so that an irradiation angle which is an angle between the traveling direction of the vehicle 20 and the laser irradiation direction is different.

  In the laser light emitting device according to the present embodiment, the angle (maximum irradiation angle) δ between the laser located on the rightmost side and the laser located on the leftmost side with respect to the traveling direction of the vehicle 20 is about 120 °. Attached to the laser irradiator 12.

  Note that the value of the maximum irradiation angle is an example, and it is sufficient that the laser emitted from the laser light emitting element can irradiate both the roadway and the sidewalk when the vehicle 20 travels on the road surface. In this case, maintenance of not only the gas pipe buried in the roadway but also the gas pipe buried in the sidewalk can be performed at the same time.

  Further, as already described, the driving unit 52 adjusts the depression angle of the laser emitted from the laser irradiator 12.

  FIG. 5 is a diagram for explaining the adjustment of the depression angle of the laser emitted from the laser irradiator 12. In order to make the explanation easier to understand, the adjustment of the depression angle of the laser will be described by focusing on one of the lasers emitted from the laser irradiator 12. The depression angle adjustment shown in FIG. 5 is executed for each laser.

  As shown in FIG. 5, the attachment member 14 to which the laser light emitting element 18 is attached is rotatably attached to the laser irradiator housing 8 at the lower end in the height direction with respect to the road surface, and the upper end is connected to one end of the arm 16. Has been.

The arm 16 is driven by the motor of the drive unit 52 and moves, for example, in the AR1 direction and the AR2 direction of the arrow AR. Therefore, as the arm 16 moves in the direction AR1 of the arrow AR, the mounting member 14 moves so as to rise perpendicularly to the road surface. For example, the depression angle of the laser decreases from γ ₂ to γ ₁ , and finally For example, the arm 16 moves to a position where the depression angle γ becomes 0 °. On the other hand, according to the arm 16 is moved to the AR2 the direction of arrow AR, since the mounting member 14 is moved to become parallel to the road surface, for example, the depression angle of the laser is increased so that the gamma ₁ of gamma _2, and finally For example, the arm 16 moves to a position where the depression angle γ becomes 90 °.

  Note that the mechanism for adjusting the laser depression angle in FIG. 5 is merely an example, and it goes without saying that any mechanism may be used as long as the laser depression angle can be adjusted. The wavelength of the laser emitted from the laser light emitting element 18 is 1.6 μm, for example, in accordance with the absorption wavelength of methane, which is the most abundant component in the gas, but any wavelength capable of detecting the gas. Needless to say, any wavelength laser may be used.

  In addition, even if the depression angle is the same, the laser reach distance becomes longer as the installation position of the laser irradiator 12 becomes higher. Therefore, the laser irradiator 12 is installed above the height of the vehicle 20 such as on the roof of the vehicle 20. It is preferable. However, the installation position of the laser irradiator 12 is not particularly limited. For example, the laser irradiator 12 may be installed on the front grill of the vehicle 20 where a fog lamp or the like is installed. Moreover, you may incorporate the laser irradiation device 12 in a fog lamp.

  The light receiving unit 56 includes a plurality of laser light receiving elements each paired with the plurality of laser light emitting elements 18, and receives a reflected laser reflected from the road surface among lasers emitted from the pair of laser light emitting elements 18. The light receiving unit 56 converts the intensity of the reflected laser received for each laser light receiving element into, for example, a voltage and notifies the detection unit 58 of the voltage. In the light receiving unit 56, for example, as the intensity of the received reflected laser increases, the voltage notified to the detection unit 58 is set higher.

  The detection unit 58 determines that the laser is absorbed by methane when the voltage indicating the intensity of the reflected laser notified from the light receiving unit 56 is lower than a predetermined threshold value, that is, when the laser intensity is lower than the predetermined intensity. And the presence of gas is detected.

  And the detection part 58 notifies the specific part 62 that gas was detected with the identifier for identifying the laser light receiving element which detected gas.

  On the other hand, the measuring unit 60 measures the position of the vehicle 20 using, for example, a GPS (Global Positioning System) unit, and notifies the specifying unit 62 of the position information of the vehicle 20, that is, the longitude, latitude, and traveling direction of the vehicle 20. To do. Here, the position of the vehicle 20 specifically refers to the position of the laser light emitting element 18 attached to the laser irradiator 12.

  When the detection of the gas is notified from the detection unit 58, the specification unit 62 is notified from the detection unit 58 of the position information of the vehicle 20 notified from the measurement unit 60, the depression angle of the laser notified from the drive unit 52. The laser irradiation position on the road surface is specified using the laser irradiation angle of the laser light-emitting element 18 paired with the laser light-receiving element that detects the gas to be detected.

  Then, the specifying unit 62 notifies the display unit 64 of the position information of the vehicle 20 and the laser irradiation position information indicating the laser irradiation position on the specified road surface.

  The display unit 64 has map data in advance, and displays a map around the vehicle 20 including the position of the vehicle 20 on a display member such as a liquid crystal panel using the position information of the vehicle 20 notified from the specifying unit 62. To do. The display unit 64 displays the laser irradiation position on the map by using the laser irradiation position information notified from the specifying unit 62.

  In addition, control of the gas leak detection apparatus 10 which concerns on this embodiment is realizable using the computer 70, as shown in FIG.

  The computer 70 includes a central processing unit (CPU) 701, a read only memory (ROM) 702, a random access memory (RAM) 703, a nonvolatile memory 704, and an input / output interface (I / O) 705 via a bus 706. Connected. The I / O 705 is connected to the switch 22, the liquid crystal panel 24, the GPS unit 26, the motor 28, the switching element 32, and the laser light receiving element 34, and the laser light emitting element 18 is connected to the switching element 32, and the CPU 701. The operation is controlled by.

  Here, the switch 22 is an input member that receives various instructions from the inspector in the reception unit 50, and the liquid crystal panel 24 is a display member that displays a map in the display unit 64. The GPS unit 26 is a measurement member that measures the position of the vehicle 20 in the measurement unit 60. The motor 28 is a driving member that drives the mounting member 14 of the laser light emitting element 18 in the driving unit 52, and the switching element 32 is a driving member that drives the laser light emitting element 18 on and off in the driving unit 52. The laser light receiving element 34 receives a reflected laser reflected from the road surface among the lasers emitted from the laser light emitting element 18.

  Next, the operation of the gas leak detection device 10 will be described. The gas leak detection apparatus 10 according to the present embodiment executes a gas leak detection process when the reception unit 50 receives a gas leak detection start instruction, for example. Note that a gas leak detection program for executing the gas leak detection process is stored in advance in the ROM 702, for example.

  FIG. 7 is a flowchart showing an example of the flow of the gas leakage detection process of the gas leakage detection device 10 according to the present embodiment.

  First, in step S <b> 10, the specifying unit 62 acquires the position information of the vehicle 20 notified from the measurement unit 60.

  Next, in step S20, the specifying unit 62 acquires the irradiation angle of each laser stored in advance in a predetermined area of the nonvolatile memory 704, for example. When the driving unit 52 has a function of adjusting the irradiation angle of each laser in accordance with an instruction from the inspector, the specifying unit 62 may acquire the irradiation angle of each laser at the present time from the driving unit 52, for example.

  In step S <b> 30, the specifying unit 62 acquires the laser depression angle notified from the driving unit 52. Since the driving unit 52 according to the present embodiment can adjust the depression angle for each laser, the specifying unit 62 acquires the depression angle of each laser at the current time from the driving unit 52.

  In step S40, the specifying unit 62 uses the position information of the vehicle 20 acquired in the process of step S10, the irradiation angle of each laser acquired in the process of step S20, and the depression angle of each laser acquired in the process of step S30. Then, the irradiation position on the road surface of each laser is specified.

  Specifically, the specifying unit 62 specifies the irradiation position on the road surface of each laser with reference to, for example, the correction table 66 stored in advance in a predetermined area of the nonvolatile memory 704.

  FIG. 8 is a diagram illustrating an example of the correction table 66. As shown in FIG. 8, the correction table 66 includes, for example, a depression angle column representing a laser depression angle and a correction distance column representing a correction distance corresponding to the depression angle. Although the correction table 66 shows the correction distance for each depression angle of 1 °, this is an example, and the correction table 66 is created in accordance with the minimum driving angle of the laser depression angle by the drive unit 52.

  The correction distance in the correction distance column represents a distance along the road surface from the laser light emitting element 18 to the laser irradiation position on the road surface calculated in advance from the height from the road surface to the laser light emitting element 18 and the depression angle of the laser.

  FIG. 9 is a diagram for explaining the correction distance. As shown in FIG. 9, when the height from the road surface to the laser light emitting element 18 is h and the depression angle of the laser emitted from the laser light emitting element 18 is γ, the laser light emitting element from the position P1 on the road surface of the laser light emitting element 18 The distance to the irradiation position P2 on the road surface of the laser irradiated by 18, that is, the distance x along the road surface from the laser light emitting element 18 to the laser irradiation position on the road surface is expressed as x = h / tan γ.

  In the present embodiment, since the height h from the road surface to the laser light emitting element 18 is a fixed value, the correction table 66 describes the distance x calculated as described above for each depression angle of the laser as the correction distance. Has been. When the height h from the road surface to the laser light emitting element 18 is adjustable, a correction table 66 is prepared for each height h, and the specifying unit 62 corrects the correction table 66 corresponding to the current height h. Should be referred to.

  And the specific | specification part 62 makes the position of the vehicle 20 into the center from the position and the advancing direction of the vehicle 20 which are included in the positional information on the vehicle 20 acquired by the process of step S10, and the irradiation angle of each predetermined laser. The irradiation direction of each laser is specified. In addition, the irradiation angle of each laser shall be previously memorize | stored in the predetermined area | region of the non-volatile memory 704, for example.

  Further, for each laser, the specifying unit 62 sets a position away from the position of the vehicle 20 by a correction distance corresponding to the depression angle of the laser irradiated in the irradiation direction in the laser irradiation direction as the irradiation position on the road surface of the laser. Identify.

  And the specific | specification part 62 memorize | stores the longitude and latitude of the irradiation position on the road surface of each specified laser in order of time series in the predetermined area | region of RAM703, for example.

  In step S <b> 50, the specifying unit 62 determines whether there is a gas detection notification from the detection unit 58. In the case of negative determination, that is, when there is no gas detection notification from the detection unit 58, the process moves to step S10, and the processes of steps S10 to S50 are repeated.

  On the other hand, in the case of an affirmative determination, that is, when there is a gas detection notification from the detection unit 58, the specifying unit 62 acquires an identifier for identifying the laser light receiving element 34 that has detected the gas from the detection unit 58, Control goes to step S60.

  In step S60, the specifying unit 62 uses the identifier of the laser light receiving element 34 acquired in the process of step S50 to determine the irradiation position on the latest road surface of the laser received by the laser light receiving element 34 corresponding to the identifier from the RAM 703. Get longitude and latitude.

  Then, the specifying unit 62 notifies the display unit 64 of the longitude and latitude at the acquired laser irradiation position.

  On the other hand, the display unit 64 displays a mark at a position corresponding to the longitude and latitude notified from the specifying unit 62 on the map displayed on the liquid crystal panel 24 to notify the inspector where the gas is detected. . At this time, the display unit 64 may display a location where the gas is detected on a map together with a sound notifying that the gas has been detected.

  As described above, according to the gas leak detection device 10 of the present embodiment, a plurality of lasers can be emitted from the laser irradiator 12 toward the road surface, and therefore, a plurality of points on the road surface can be simultaneously traveled by one vehicle 20. It is possible to detect the presence or absence of gas leakage in Therefore, compared with the case where the presence or absence of gas leakage is detected for each point, maintenance of the gas pipe embedded in the road surface can be performed efficiently.

  Furthermore, the gas leak detection apparatus 10 according to the present embodiment can specify the irradiation position of the laser on the road surface using the latitude and longitude. Therefore, it is possible to specify the gas leak location with high accuracy, compared with the case where the laser irradiation position is photographed with a camera or the like and the gas leak location is specified, and the maintenance of the gas pipe embedded on the road surface is efficiently performed. Can be implemented.

  In order to accurately detect gas leakage from the gas pipe 30 embedded in the road surface, the interval (irradiation laser interval) in the direction orthogonal to the traveling direction of the vehicle 20 of each laser on the road surface is about 30 cm. Thus, it is preferable to adjust the depression angle of the laser. This is because the accuracy of gas detection decreases as the irradiation laser interval becomes longer than 30 cm. On the other hand, even if the irradiation laser interval is shorter than 30 cm, the gas is detected as compared with the case where the irradiation laser interval is 30 cm. This is because the accuracy tends not to change.

  Moreover, although the example which measures the longitude, latitude, and advancing direction of the vehicle 20 was shown in the measurement part 60 which concerns on this embodiment, you may make it measure the inclination of the vehicle 20 using a gyro sensor etc., for example. . In this case, by further correcting the correction distance acquired by the specifying unit 62 using the correction table 66 according to the inclination of the vehicle 20, the irradiation position of each laser on the road surface can be specified with higher accuracy.

  Further, as shown in FIG. 10, for example, an intake port 36 having a length about the width of the vehicle that takes in air on the road surface is provided near the lower part of the bumper of the vehicle 20, and the intake port 36 is naturally provided as the vehicle 20 travels. You may make it detect whether the gas component is contained in the air which enters.

  The air taken in from the intake port 36 enters the gas detector 38 via a pipe (not shown) provided in the vehicle 20 as shown in FIG. In the gas detector 38, for example, in the same manner as the gas detection method using the laser already described, whether or not a gas component is included in the air from the intensity of the reflected laser by irradiating the laser into a space filled with air. Is detected. Then, the air whose gas component has been detected is exhausted to the outside of the vehicle 20. Thus, the gas detector 38 detects the gas component contained in the air around the moving path of the vehicle 20.

  The sensor used for gas detection of the gas detector 38 is not limited to an optical sensor using a laser. For example, a contact combustion type sensor that detects the amount of heat generated when gas burns on the oxidation catalyst, or a semiconductor type sensor that detects a change in resistance value that occurs when a metal oxide semiconductor comes into contact with the gas, as a gas concentration, etc. A solid sensor may be used.

  Further, the attachment position of the intake port 36 is not limited to the vicinity of the lower part of the bumper of the vehicle 20 as long as the position is close to the road surface. When a gas leak occurs in the gas pipe 30 embedded in the road surface, the leaked gas often ejects from a crack or manhole on the road surface. Therefore, by providing the intake port 36 at the position of the vehicle 20 close to the road surface, the leaked gas can be detected with high accuracy.

  Further, a suction machine (not shown) may be provided at the intake port 36 to forcibly suck the air on the road surface. In this case, since more air can be taken into the gas detector 38 compared to natural suction, the accuracy of gas detection by the gas detector 38 is improved.

  The suction type gas detector 38 is not affected by the weather and irradiates the laser confined in a space of a predetermined size with a laser. Therefore, the laser irradiator 12 irradiates the laser and leaks to the road surface. Compared with the case of detecting gas, the gas on the road surface can be detected with high accuracy.

  Furthermore, by using the gas leak detection device 10 in combination with the suction type gas detector 38, it is possible to detect leaked gas in a wider range than the gas detection range of the gas detector 38.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which such modifications or improvements are added are also included in the technical scope of the present invention.

  Moreover, although embodiment demonstrated the aspect by which the gas leak detection program was previously memorize | stored in ROM702, it is not limited to this. The gas leakage detection program according to the present invention can be provided in a form recorded on a computer-readable recording medium. For example, the gas leakage detection program according to the present invention can be provided in a form recorded on a portable recording medium such as a CD-ROM, a DVD-ROM, and a USB memory. The gas leakage detection program according to the present invention can also be provided in the form of being downloaded from a terminal device such as a server via a wired or wireless line connected to a communication interface (not shown).

  In the present embodiment, an automobile is used as an example of the vehicle 20 on which the gas leakage detection device 10 is installed. However, the vehicle 20 includes a rear vehicle, a bicycle, and the like, a light vehicle without a prime mover, a motorcycle, and the like. It is. Further, for example, the gas leak detection device 10 according to the present embodiment may be installed in a movable body that can be operated remotely, such as a radio control car and a radio control helicopter, a robot that can move autonomously, and the like. When the gas leak detection device 10 is installed in a two-wheeled vehicle such as a bicycle or a motorcycle, maintenance of a gas pipe embedded in a road with a width that the four-wheeled vehicle 20 cannot pass can be performed. In addition, when the gas leak detection device 10 is installed on a mobile body that can be operated remotely or a mobile body such as a robot that can move autonomously, a gas leak location in a dangerous place that cannot be directly accessed by an inspector is specified. Can do.

DESCRIPTION OF SYMBOLS 10 ... Gas leak detection apparatus, 12 ... Laser irradiation device, 14 ... Mounting member, 16 ... Arm, 18 ... Laser light emitting element, 20 ... Vehicle, 22 ... Switch, 24 ... Liquid crystal panel, 26 ... Unit, 28 ... Motor, 30 DESCRIPTION OF SYMBOLS ... Gas pipe, 32 ... Switching element, 34 ... Laser light receiving element, 36 ... Intake port, 38 ... Gas detector, 50 ... Reception part, 52 ... Drive part, 54 ... Irradiation part, 56 ... Light receiving part, 58 ... Detection part , 60 ... measurement unit, 62 ... identification unit, 64 ... display unit, 66 ... correction table, 70 ... computer, 701 ... CPU, 702 ... ROM, 703 ... RAM, 704 ... non-volatile memory

Claims (9)

A gas leak detection device installed in a moving body,
An irradiation unit for irradiating each of a plurality of points on the road with a laser;
Among the lasers irradiated from the irradiation unit, a light receiving unit that receives each reflected laser reflected at the plurality of points, and
From the received light intensity of each of the reflected lasers received by the light receiving unit, a detection unit that detects the presence or absence of a gas component at each of the plurality of points;
Gas leak detection device with The gas leak detection apparatus according to claim 1, further comprising a drive unit that drives the irradiation unit so as to change a depression angle of the laser irradiated from the irradiation unit with respect to the road surface. Further comprising a specifying unit for specifying the position of each of the plurality of points that are the irradiation destinations of the laser emitted from the irradiation unit;
The gas leak detection device according to claim 1 or 2. A measuring unit for measuring the position of the movable body;
The specifying unit includes the position and traveling direction of the moving body measured by the measuring unit, the depression angle of the laser irradiated from the irradiation unit, and the moving body when the moving body is viewed toward the road surface. Using the irradiation angle, which is an angle between the traveling direction of the laser beam and the irradiation direction of the laser irradiated from the irradiation unit, and the height of the irradiation unit from the road surface, the laser was irradiated from the irradiation unit The gas leak detection device according to claim 3, wherein positions of the plurality of points are specified. The gas leakage detection device according to any one of claims 1 to 4, wherein the irradiation unit and the light receiving unit are installed above a height of the moving body. The gas detection part which detects the presence or absence of the gas component contained in the air on the movement path | route of the said mobile body installed in the said mobile body and taken in with the movement of the said mobile body was further provided. 6. The gas leakage detection device according to any one of items 5. The gas leak detection device according to claim 6, wherein the gas detection unit forcibly sucks the air. The gas leak detection device according to claim 6 or 7, wherein an intake port for sucking the air is installed at a position close to the road surface of the movable body. The gas leak detection device according to any one of claims 1 to 8, wherein the mobile body is any one of a vehicle, a mobile body that can be operated remotely, or a robot capable of autonomous movement.

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