JP2013128185A - Camera system and camera mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera system and a camera mount for image capture that are easily portable and are provided with toxic gas detecting function.SOLUTION: A camera system comprises: a light emitting section 11 for emitting a laser beam having a wave length absorbed by a methane gas; a light modulation driving section 12 for modulating the laser beam; a light receiving section 13 for receiving reflection light from a target; a telescopic rod LD with a leading end that is rotatably mounted to a camera for photographing such that the leading end can be oriented in a vertical direction and is incorporated with the light emitting section 11, the light modulation driving section 12 and the light receiving section 13; a light demodulating and gas detecting section 14 that demodulates a reception signal from the light receiving section 13 and measures a concentration of the methane gas from absorption of the methane gas; an alarm section 15 for generating an alarm when the concentration of the methane gas exceeds a predetermined concentration; and an MPU3 for displaying the alarm on an LCD7 when the alarm is notified.

Description

  Embodiments of the present invention relate to a camera system with a built-in optical gas sensor for recording and photographing a construction situation and a camera mount for mounting a photographing camera.

  Construction record photos related to construction, repair, electrical work, gas, water supply, etc. of facilities, equipment, etc., manholes, pump wells, foundations, sewer pipes, underground burial work, tunnel work, poorly ventilated places, microorganisms There are many cases where pictures are taken in a dangerous place where toxic gas is generated due to respiration or soil components, or where the oxygen concentration is low.

  When working in manholes or sewer pipes where danger is assumed in advance, as a countermeasure against these toxic gases, take a picture after preparing a gas sensor and confirming safety before on-site work. There are gas sensors that detect toxic gases from remote locations by infrared measurement and remote monitoring (thermographic) cameras that capture gas distribution (for example, Non-Patent Document 1). However, it is not suitable for photographing and recording a visual situation like a construction photograph (for example, Patent Document 1). On the other hand, the gas sensor is also relatively large, and there are problems in terms of safety measures, such as troublesome preparation and carrying forgotten to bring a gas detector with a construction recording camera.

JP 2006-30214 A (Noto 4209877)

FLIR Systems Japan K.K FLIR Gas Find IR Catalog

  When taking record photographs of conventional construction work, there were problems with safety measures, such as difficulties in carrying a large gas detector and forgetting to bring a gas detector with a construction record camera. .

  The problem to be solved by the present invention is to provide a camera system and camera mount for construction record photography that are easy to carry and have a toxic gas detection function.

  In order to achieve the above object, the camera system of the present embodiment is a camera system that records photographed image data in a storage means, and has a monitor display function, a camera unit that shoots an electronic video photograph, and a detection target gas A light emitting means for modulating and emitting infrared light of a specific wavelength absorbed by the target, and a light receiving means for receiving the reflected light of the transmitted light, converting it into an electrical signal and outputting it A telescopic rod having a tip of the light emitting means and the light receiving means and extending and contracting, and the tip of which is attached to the camera by a rotation mounting shaft that can be oriented in the vertical direction of the camera; The optical demodulation / gas detection means for further demodulating the signal and outputting the gas concentration data measured from the gas absorption amount, and the measured gas concentration data are input. If the alarm exceeds a predetermined value, an alarm output unit that generates and outputs an alarm, and a control unit that performs control to display an alarm on the monitor display or a finder provided in the camera unit when the alarm is input It is characterized by providing.

  Further, the camera mount of the present invention includes a mount unit for mounting and fixing the camera, a light emitting means for transmitting the infrared light having a specific wavelength absorbed by the detection target gas so as to be aimed at the imaged target, and the transmission A light receiving means for receiving the reflected light of the reflected light, converting it into an electrical signal and outputting it, and the light emitting means and the light receiving means at the distal end portion, and a telescopic rod shape, the distal end portion being the vertical direction of the camera A telescopic rod attached to the mount with a rotation mounting shaft that can be directed to the light, a light demodulation / gas detection means for further demodulating the electrical signal and outputting gas concentration data measured from the amount of gas absorption, and the measurement And an alarm output means for generating and outputting an alarm when the measured gas concentration data is inputted and exceeds a predetermined value.

FIG. 3 is a functional block diagram for explaining the operation of the camera according to the first embodiment. 1 is an external view of a camera according to a first embodiment. 1 is an external view of a camera according to a first embodiment. FIG. 3 is a structural diagram illustrating the structure of the distal end portion of the telescopic rod LD of the first embodiment. A flowchart for explaining an operation processing procedure of the camera according to the first embodiment. The functional block diagram explaining operation | movement of the camera system of 2nd Embodiment. The external view of the camera system of 2nd Embodiment.

  Hereinafter, a camera system according to an embodiment will be described with reference to the drawings.

FIG. 1 is a functional block diagram for explaining the operation of the camera system according to the first embodiment of the present invention.
In FIG. 1, the camera system CS of the present embodiment is a combination of a gas detection processing unit 10 that is an optical gas detection unit that detects methane gas using infrared laser light and a camera that captures an image having another configuration. Camera system. Here, the camera is described as an example of a so-called digital camera using an electronic image sensor.

  The camera has an image pickup device 1 for picking up an image with visible light for taking a photograph in a normal viewing situation, a digital IF (interface) unit 2 which is a conversion / interface means for digitally processing the image signal and the monitoring control signal, MPU 3, time timer 31, measurement timer 32, internal memory 4, external memory 5 for recording captured data, LCD (Liquid Crystal Display) driver 6 for displaying captured images on a monitor, LCD 7, lens L, focus and aperture of the lens (FIG. (Not shown), etc., a mechanism unit 8 for setting parameters, an operation unit 9 for inputting various parameters required by the camera operator, a gas detection processing unit 10, a shutter button s, and a finder f.

  The gas detection processing unit 10 is a telescopic rod (rod) in which a light emitting unit 11 that transmits infrared rays for gas detection, and a light receiving unit 13 that receives light transmitted from the light emitting unit 11 and converts it into an electrical signal is incorporated at the tip. LD, optical modulation driving unit 12 that modulates the transmitted light of the light emitting unit 11 by a predetermined method, optical demodulation / gas that further demodulates the received electrical signal to detect the presence or absence of a gas component, and outputs an alarm signal when detected A detection unit 14 and an alarm unit 15 that receives an alarm signal and outputs an alarm such as LED lighting and alarm sound are provided. The warning is transmitted to the MPU 3 via the digital IF unit 2, and the MPU 3 displays an alarm (warning) on the LCD 7 that monitors the shooting screen.

  As the light emitting unit 11, a light emitting element of a semiconductor laser to which a laser beam having an infrared wavelength for detecting a toxic gas is transmitted is used. The light receiving unit 13 is a light detection element such as a photodiode that converts received light into an electrical signal. The gas is detected by changing the optical signal modulated by the gas existing in the space between the light emitting unit 11 and the light receiving unit 13.

  The MPU 3 has an image processing function for performing processing such as conversion of an image pickup signal input from the image pickup device 1 into a predetermined image file format or conversion to a signal for display on the LCD 7, signals from the image pickup device 1, light reception A mechanism processing function for setting a focal point and a diaphragm (exposure light amount) of an image when a signal from the unit 13 is input, and a user I / O (input / output) processing function for setting a camera operation according to an input from the operation unit 9 Run. This function is executed by a program or data stored in the internal memory 4. The photographed image file is written and stored in the external memory 5 in association with the photographing time of the time timer 31, data related to gas detection described later, and the like.

  Further, the light demodulation / gas detection unit 14 notifies the MPU 3 of data such as gas concentration detected by demodulating the modulation information included in the signal converted into the electrical signal via the digital IF unit 2. The MPU 3 acquires shooting time data as auxiliary data for image shooting by the time timer 31, and stores data related to gas measurement such as time data when a gas detection alarm is generated and gas detection concentration at the shooting timing to the external memory 5. In addition to auxiliary data, it is written and recorded in this format.

  For this reason, it is not necessary for the camera operator to record the gas detection data each time detection is performed.

2 and 3 are external views of the camera system CS of the first embodiment.
2A is a front view of the camera system, FIG. 2B is a back view, FIGS. 3A and 3B are top views (plan views), and FIG. 3C is a side view. FIG. 3C shows a state where the telescopic rod LD is rotated forward and extended, and the light emitting portion 11 and the light receiving portion 13 are attached to the head portion 17 at the tip of the telescopic rod LD.

  The head portion 17 is small enough to pass through a small hole in a manhole cover having a diameter of about 10 mm, for example. The telescopic rod LD has a length of several tens of centimeters or more and is inserted into the tunnel from a small hole in the manhole so that the gas concentration can be measured. Even when a gas leak is displayed due to a crack in a pipe facility or the like, it is possible to measure with a low risk by bringing the tip of the telescopic rod LD close to the leak measurement position.

FIG. 4 is a structural diagram for explaining the structure of the tip of the telescopic rod LD.
In FIG. 4A, the light receiving portion 13 is attached to the tip of the head portion of the telescopic rod LD, and is similarly attached to the light emitting portion 11 in the direction of the light emitting portion 11 at an interval L near the base of the head portion 17. 11 receives the modulated light transmitted from 11. The gas intensity of the laser beam due to the gas concentration can be measured by the gas flowing into the head portion 17 through the vent 30. The gas concentration can be obtained by calculating in advance or measuring and calibrating the relationship between the concentration and the reception intensity of the modulation signal at the interval L.

  The light emitting unit 11 and the light receiving unit 13 may be attached in reverse. Further, as shown in FIG. 4B, both are attached near the base of the head portion 17, and the light receiving portion is reflected by reflecting the modulated light transmitted from the light emitting portion 11 by the mirror portion mr attached to the tip of the head portion 17. 13 may be a receiving structure.

  The telescopic rod LD is attached to the camera body with the attachment shaft 16 via the reel portion R on the side surface near the bottom of the camera C. Then, the tip end direction about the mounting shaft 16 can be rotated from the upper direction to the lower direction of the camera C. The telescopic rod LD has a concentric cylindrical shape such as a radio rod antenna, and the lead wire 27 connected to the light emitting unit 11 and the light receiving unit 13 passes through the lead rod 27. The lead wire 27 has a short telescopic rod LD. Then, the structure is wound around the reel R. The reel R has a spiral spring (not shown) inside, and the lead wire 27 can be taken up.

  The camera operator can detect the internal toxic gas concentration before entering the manhole by extending the telescopic rod LD and inserting the tip into the inside through the hole in the lid of the manhole. Also, when working in a closed space such as a manhole, if the assumed toxic gas is lighter than air, such as methane, the stretched rod LD is pointed upward, and conversely, if it is heavy gas It is possible to measure the concentration away from the breathing site of the operator from the gas staying in the surroundings by facing downward. In other words, even when the gas stays, early gas detection is possible while avoiding danger.

  A grip button B attached to the light modulation drive unit 12 is a switch for turning on at the time of photographing by grasping the body D of the camera and sending laser light from the light emitting unit 11. The auxiliary light, that is, laser light, is not sent out when not carried, but the laser light is sent out when the right hand holding the camera body D presses this grip button while grasping the camera, such as when shooting, and gas detection operation It is executed even while unconscious.

  The above is the configuration and basic functions of the camera system CS of the present embodiment. Hereinafter, a sensor function for detecting methane gas generated in a sewer, tunnel, etc., or leaked from a pipe or the like will be described.

  Here, methane gas is detected using an infrared absorption spectroscopic method using wavelength modulation spectroscopy that detects absorption of infrared light having an absorption spectrum peculiar to methane gas molecules using near-infrared semiconductor laser light having a wavelength of 1.6537 μm, and the concentration I have data. In this case, an InGaAsP DFB wavelength tunable laser diode can be used as the light source of the light emitting unit 11, and an InGaAs PIN photodiode can be used as the light receiving element of the light receiving unit 13.

  And, for example, Journal of the Japan Society of Mechanical Engineers 2004.4.1 Vol. 107 No. As shown in 1022 P51, the light modulation driver 12 performs modulation to control the injection current of the wavelength tunable laser diode to change the oscillation wavelength (emission wavelength) around the absorption wavelength of methane. The optical demodulation / gas detection unit 14 detects the received signal from the light receiving unit 13 that receives the reflected light of the transmitted light, and detects absorption by methane using wavelength modulation spectroscopy that analyzes the received signal intensity around the absorption wavelength. Demodulation processing is performed. The light demodulation / gas detection unit 14 calculates the absorption level and gas concentration from the received light level that is the gas concentration index and notifies the alarm unit 15 of the alarm. The alarm unit 15 issues an alarm when a predetermined dangerous gas concentration is exceeded. Output. The alarm is notified to the MPU 3 via the digital IF unit 2, and the MPU 3 further performs control to display an alarm on the finder f of the camera C and the monitor display of the LCD 7.

  As a result, the difference in appearance and shape from a normal camera is small, and the same portability and operability as a normal shooting camera can be maintained, so to avoid danger when taking construction photographs as before. It is not necessary to carry the gas detector with the camera. In addition, measurement data relating to gas detection for safety confirmation can be simultaneously recorded as auxiliary data in the camera C.

FIG. 5 is a flowchart for explaining an operation processing procedure of the camera according to the first embodiment.
The camera C is turned on by the operator and enters preparation for photographing (step s1 in FIG. 5A). When the camera is held, the grip button is pressed, the switch is turned on (step s2), and the laser light modulated from the light emitting unit 11 irradiates the photodiode of the light receiving unit 13 (step s3). (The gas can be detected before entering the manhole by inserting the telescopic rod LD into the small hole of the manhole at this timing.)

  At this time, the laser light (modulated light) cn has the oscillation wavelength of the wavelength tunable laser diode modulated within a predetermined range so as to enable gas detection. The light receiving unit 13 receives the transmitted laser beam (step s4). The light received by the light receiving unit 13 is converted into an electrical signal, demodulated by the light demodulating / gas detecting unit 14, the gas concentration is measured according to the level of absorption, and the alarm unit 15 is notified (step s5).

  When the gas concentration exceeds the alarm level (when step s6 is Yes), the alarm unit 15 displays an alarm (for example, by flashing a mark on the finder or the LCD 7 on the back surface or by a built-in electronic buzzer (not shown)). Alarm) is output. This measured value is input to the MPU 3 via the digital IF unit 2.

  The MPU 3 performs processing for displaying an alarm on the LCD 7, and writes and stores the measurement data in the external memory 5 as auxiliary data together with the time information acquired by the time timer 31 (step s7). When the camera operator presses the shutter button s and releases it (step s8 is Yes), the captured image and the measured value of the gas concentration are associated with time information and written and stored in the external memory 5 as auxiliary data (step s9). Note that the time information TX of the time timer is displayed on the LCD 7.

  By this process, when the gas concentration is higher than the reference value, the situation is recorded in the external memory as an alarm occurrence record even at the timing before the image is taken. On the other hand, when an image is taken, the gas concentration at the photographing time is recorded in the external memory regardless of the presence or absence of an alarm.

  In order to record the gas concentration, as shown in FIG. 5B, the gas concentration may be recorded in the external memory 5 at intervals of, for example, 3 seconds even when no alarm is generated. The selection of the auxiliary data recording method is switched by a predetermined operation method of the setting button of the operation unit 9 to set a processing procedure controlled by the MPU 3. In the process of FIG. 5B, step s6 and step s7 of FIG. 5A are changed to step s61 and step s71, respectively.

  The measurement record of the gas concentration is set from the operation unit 9 so as to be recorded when an alarm is issued in step s6 of FIG. 5A, but in step s61 of FIG. The continuous recording mode for automatic recording is set. In step s71, the measurement values are written and recorded in the external memory at intervals of 3 seconds.

FIG. 6 is a functional block diagram for explaining the operation of the camera system of the second embodiment of the present invention, and FIG. 7 is an external view of the camera system CS of the second embodiment.
As shown in FIG. 6, in the first embodiment, the gas detection processing unit 10 included in the camera body is accommodated in the camera mount CM attached to the camera Cx body in the second embodiment. 7A is an external view from the front when the camera Cx is attached to the camera mount CM, FIG. 7B is an external view from the back, and FIG. 7C is a front view of the camera mount CM. FIG. 7D is an external view from the back.

  The camera Cx is mounted and fixed to the camera mount CM with a fixing screw 93 attached to the frame 91 of the camera mount CM. The frame 91 is attached with an accommodating portion 92, accommodates the gas detection processing portion 10 and a battery (not shown), and is attached so that the operation portion 9 of the gas detection processing portion 10 can be operated from the bottom surface.

  The gas detection processing unit 10 is appropriately accommodated together with the battery in the accommodation unit 92 of the camera mount CM. Further, the power switch 25 and the grip button B of the gas detection processing unit 10 are attached to the grip 90 of the camera mount CM. The grip button B is a switch for turning on the operation of the gas detection processing unit 10 during gripping, and the power switch 25 and the grip button B may be combined into one.

  In the second embodiment, the control processing unit 22 dedicated to the gas detection process, the operation unit 9, the I / O interface 50 that performs data input / output between the gas detection processing unit 10 and the camera Cx, the measurement timer 32, and the alarm unit 15 Are provided by the gas detection processing unit 10 itself. The control processing unit 22 is a functional circuit that executes digital signal processing corresponding to the digital IF unit 2 and the MPU 3 in FIG. The alarm unit 15 outputs an alarm sound such as an LED alarm emission or an electronic buzzer. The alarm input from the light demodulation / gas detection unit 14 to the control processing unit 22 is further output to the camera Cx via the I / O interface 50.

  In addition, information related to gas detection is input / output between the camera Cx main body and the control processing unit 22 via an I / O interface 50 such as a USB (Universal Serial Bus). Some cameras that can output captured image data to the outside can input / output digital signals (data) input via the I / O interface 50 to / from the MPU 3 and display them on a monitor display such as the LED 7. . This data input / output display function is privately used for adjustment at the time of manufacturing the camera. However, characters, marks, and the like that can be displayed on a monitor display such as the LCD 7 using these data formats can be displayed as an alarm (warning) by flashing the display. Is possible. Furthermore, the data input via the I / O interface 50 may be used as auxiliary data for the image of the camera Cx that captured the data.

  To the camera Cx main body via the I / O interface 50, a gas detection notification alarm to the camera Cx according to a program prepared in advance in the control processing unit 22 based on the data input / output conditions of the MPU 3 on the camera Cx side, Gas detection timing information and the like are output in a predetermined data format.

  Although the I / O interface 50 is not displayed in the external view, a small cable connector or the like is prepared in the camera Cx, so that information is transmitted via a cable that transmits data through the I / O interface 50.

  When the camera Cx body does not have an I / O interface, the gas detection processing unit 10 has detected gas to the camera operator by an alarm notification means such as an alarm LED 151 or an electronic buzzer attached to the camera mount CM. Can be notified. In this case, the camera cannot directly display an alarm or record a gas detection record in an external memory or the like, but it can contribute to safety as a configuration in which the camera and the gas alarm are combined. In other words, in the second embodiment, even when combined with a film camera, an alarm is output when gas is detected, and the operator can be kept safe.

  As described above, in the first and second embodiments, the switch that activates the operation of the gas detection processing unit 10 is attached to the camera body or the grip of the camera mount as the grip button B, and the camera operator is unconscious. However, since the power is turned on, it is possible to detect a harmful gas and to issue an alarm during photographing.

  According to the camera system of at least one embodiment described above, a methane gas detector that has a methane gas detection function for a shooting target by an infrared absorption method in addition to an image shooting function and detects a toxic gas and notifies the danger is carried. Therefore, it is possible to provide a camera system that can safely photograph the construction status with one camera.

  In addition, the embodiment has been described by taking methane gas as an example. However, even if other gas is used, detection can be performed similarly by selecting and combining light emitting elements and photodetectors corresponding to the wavelength for measuring the gas concentration. It is.

  Further, the above explanation has been given for the case where the concentration of the toxic gas exceeds the reference value, but conversely, for example, when the concentration becomes lower than a predetermined concentration for detecting a situation where oxygen is deficient (there is no necessary gas). In this case, an alarm may be output.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Image sensor 2 Digital IF (interface) part 3 MPU
31 Time Timer 32 Measurement Timer 4 Internal Memory 5 External Memory 50 I / O Interface 6 LCD (Liquid Crystal Display) Driver 7 LCD
L lens B grip button LD telescopic rod R reel s shutter button f finder 8 mechanism unit 9 operation unit 10 gas detection processing unit 11 light emitting unit 12 light modulation driving unit 13 light receiving unit 14 light demodulation / gas detection unit 15 alarm unit 16 mounting shaft 17 Head part 22 Control processing part 90 Grip 91 Frame 92 Housing part 93 Fixing screw

Claims (7)

In a camera system for recording photographed image data in a storage means,
A camera unit that has a monitor display function and takes electronic video photographs;
A light emitting means that modulates infrared light of a specific wavelength absorbed by the detection target gas, and is transmitted while aiming at the target to be imaged;
A light receiving means for receiving the reflected light of the transmitted light, converting it into an electrical signal, and outputting it;
A telescopic rod provided with the light emitting means and the light receiving means at a distal end portion, in a rod shape that expands and contracts, and the distal end portion is attached to the camera with a rotation mounting shaft that can be oriented in the vertical direction of the camera;
A light demodulation / gas detection means for outputting gas concentration data measured from the amount of gas absorption by further demodulating the electrical signal;
Alarm output means for generating and outputting an alarm when the measured gas concentration data is input and exceeds a predetermined value;
And a control unit that performs control to display an alarm on the monitor display or a finder included in the camera unit when the alarm is input. In a camera system for recording photographed image data in a storage means,
A camera unit that has a monitor display function for displaying information input via a data input interface and that takes an electronic video photograph;
While fixing and holding the camera unit,
A light-emitting means that is modulated by infrared light of a specific wavelength absorbed by the detection target gas and is sent to aim at the target to be imaged;
A light receiving means for receiving the reflected light of the transmitted light, converting it into an electrical signal, and outputting it;
A telescopic rod provided with the light emitting means and the light receiving means at a distal end portion, in a rod shape that expands and contracts, and the distal end portion is attached to the camera with a rotation mounting shaft that can be oriented in the vertical direction of the camera;
A light demodulation / gas detection means for outputting gas concentration data measured from the amount of gas absorption by further demodulating the electrical signal;
Alarm output means for generating and outputting an alarm when the measured gas concentration data is input and exceeds a predetermined value;
A data interface for inputting and outputting a digital signal of a predetermined format to and from the camera;
A camera system comprising: a mount unit that accommodates a control unit that performs control to output alarm information to be displayed on the monitor display via the data interface unit when the alarm is input. The camera further includes an internal timer and a shutter for notifying the control means whether the shutter button is in a half-pressed state or completely pressed and released,
The control means acquires the gas concentration data output by the light demodulation / gas detection means,
Writing and recording the gas concentration data acquired at the shooting timing in the storage means as auxiliary data associated with the shooting time information with reference to the internal timer in the image data shot and recorded at the released timing. The camera system according to claim 1 or 2. The control means includes
Obtaining the gas concentration data output by the light demodulation and gas detection means;
2. When an alarm is input from the alarm output means, the acquired gas concentration data is written and recorded in the storage means as auxiliary data associated with the measurement time information with reference to the internal timer. 2. The camera system according to 2. The control means includes
The gas concentration data output by the optical demodulation and gas detection means with reference to the internal timer is periodically acquired,
3. The camera system according to claim 1, wherein the periodically acquired gas concentration data is written and recorded in the storage means as auxiliary data associated with the measurement time information. A mount for mounting and fixing the camera;
A light-emitting means that is modulated by infrared light of a specific wavelength absorbed by the detection target gas and is sent to aim at the target to be imaged;
A light receiving means for receiving the reflected light of the transmitted light, converting it into an electrical signal, and outputting it;
A telescopic rod provided with the light emitting means and the light receiving means at a distal end portion and extending and contracting, and the distal end portion being attached to the mount by a rotation mounting shaft that can be oriented in the vertical direction of the camera;
A light demodulation / gas detection means for outputting gas concentration data measured from the amount of gas absorption by further demodulating the electrical signal;
A camera mount comprising alarm output means for generating and outputting an alarm when the measured gas concentration data is inputted and exceeds a predetermined value. A camera mount equipped with a monitor display function capable of displaying information input via a data input interface and attached to a camera for taking an electronic video photograph,
A mount portion for mounting and fixing the camera portion;
A light-emitting means that is modulated by infrared light of a specific wavelength absorbed by the detection target gas and is sent to aim at the target to be imaged;
A light receiving means for receiving the reflected light of the transmitted light, converting it into an electrical signal, and outputting it;
A telescopic rod provided with the light emitting means and the light receiving means at a distal end portion, extending and contracting in a rod shape, and the distal end portion being attached to the mount portion with a rotation mounting shaft capable of directing in the vertical direction of the camera;
A light demodulation / gas detection means for outputting gas concentration data measured from the amount of gas absorption by further demodulating the electrical signal;
Alarm output means for generating and outputting an alarm when the measured gas concentration data is input and exceeds a predetermined value;
A data output interface;
A camera mount comprising: control means for performing control to output alarm information to be displayed on the monitor display via the data output interface means when the alarm is input.

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