CN111474113A - Laser spectrum detection device for petrochemical multi-dimensional sensing inspection robot - Google Patents
Laser spectrum detection device for petrochemical multi-dimensional sensing inspection robot Download PDFInfo
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- CN111474113A CN111474113A CN202010296737.8A CN202010296737A CN111474113A CN 111474113 A CN111474113 A CN 111474113A CN 202010296737 A CN202010296737 A CN 202010296737A CN 111474113 A CN111474113 A CN 111474113A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
Abstract
The invention relates to the technical field of industrial inspection robots, and discloses a laser spectrum detection device for a petrochemical multidimensional sensing inspection robot, which comprises: the laser device comprises a laser transmitter, a laser control unit connected with the laser transmitter, a first photoelectric detector used for absorbing light beams reflected by a target position, generating a target electric signal, a calibration unit used for receiving partial light beams transmitted by the laser transmitter and generating the target electric signal, and a DSP microprocessor. The laser emitter emits laser with specific wavelength, part of laser beam is emitted to the target position, part of laser beam is intercepted by the calibration unit, the beam intercepted by the calibration unit generates a target electric signal, the beam reflected back after being emitted to the target position is absorbed by the first photoelectric detector and converted into a target electric signal, and the DSP microprocessor carries out operation processing on the target electric signal and the target electric signal so as to judge whether methane gas leaks from the target position. The gas detection device realizes remote gas detection, has high safety factor and high corresponding speed.
Description
Technical Field
The invention relates to the technical field of industrial inspection robots, in particular to a laser spectrum detection device for a petrochemical multi-dimensional sensing inspection robot.
Background
With the development progress of petrochemical enterprises, the concern on safety is more and more extensive. Explosion protection is at the forefront in the safety of oil field production. The petrochemical industry is often in open areas, has high-precision instruments and equipment, and has complicated and severe hidden dangers such as petroleum and toxic gas leakage. Most of the devices are in dangerous explosive gas environments, and if an emergency occurs, the result of immeasurability can be generated, so that safety accidents of petrochemical enterprises can be effectively prevented, and the operation environment, particularly the content of combustible gas in the gas, can be regularly detected.
The traditional gas detector is a 'point type' detector, and comprises a catalytic combustion type detector and an electrochemical type detector:
the working principle of the catalytic combustion type detector is as follows: the surface of the detector is provided with a layer of electrified stone, the detector is arranged in a detection environment, if methane gas in the detection environment is contacted with the electrified stone on the surface of the detector, a sparking phenomenon can occur, and therefore methane detection is achieved.
The working principle of the electrochemical detector is as follows: a layer of catalyst is arranged on the surface of the detector, and when the detector is electrified, the catalyst can react with methane to generate water and carbon dioxide.
The above "point" detectors have the following drawbacks: they all belong to the diffusion detector, i.e. the detection can only be achieved when the gas diffuses to the detector position, and therefore the response is not timely.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a laser spectrum detection device for a petrochemical multi-dimensional perception inspection robot, which can realize remote detection, is quick in response and accurate in detection result.
The invention provides a laser spectrum detection device for a petrochemical multidimensional sensing inspection robot, which comprises:
a laser transmitter for transmitting a light beam of a specific wavelength to a target position;
the laser control unit is connected with the laser transmitter, sends out a test signal and controls the laser transmitter to work;
a first photodetector for absorbing the light beam reflected from the target position and converting the light beam into a target electrical signal;
the calibration unit receives partial light beams emitted by the laser emitter and generates a calibration electric signal;
and the DSP microprocessor is connected with the laser control unit, the first photoelectric detector and the calibration unit, realizes the operation processing of the electric signals and calibrates the target electric signals through the calibration electric signals.
By adopting the technical scheme, the laser emitter is controlled to emit laser with a specific wavelength by the laser control unit; part of the laser beam is shot to the position of the target, part of the laser beam is intercepted by the calibration unit, and the light beam intercepted by the calibration unit generates a target electric signal and is sent to the DSP microprocessor for calibrating the light beam reflected by the position of the target; the light beam reflected back after the light beam is emitted to the target position is absorbed by the first photoelectric detector, converted into a target electric signal and sent to the DSP microprocessor, and the DSP microprocessor carries out operation processing on the target electric signal and the target electric signal, namely, the target electric signal is calibrated through the calibration electric signal, so that whether methane gas leaks from the target position is judged. The gas detection device realizes remote gas detection, has high safety factor and high corresponding speed.
The present invention in a preferred example may be further configured such that the laser control unit includes:
the laser driving unit is connected with the laser emitter so as to drive the laser emitter to act;
the signal generator is connected between the DSP microprocessor and the laser driving unit and sends out a test signal;
and the modulation circuit is connected between the signal generator and the laser driving unit.
By adopting the technical scheme, the signal generator sends out the test signal with the specific wavelength, the test signal is modulated by the modulation circuit and then sent to the laser driving unit, and the laser driving unit drives the laser transmitter to transmit the laser beam with the specific wavelength.
The present invention in a preferred example may be further configured such that the calibration unit includes:
a first sample cell for storing a sample for detecting a target gas;
the second photoelectric detector is used for absorbing the light beam passing through the first sample cell after the target gas is detected and converting the light beam into a target electric signal;
and the second demodulation circuit is connected between the second photoelectric detector and the DSP microprocessor.
By adopting the technical scheme, the light beam entering the first sample cell is emitted to the second photoelectric detector, the second photoelectric detector absorbs the light beam passing through the first sample cell after detecting the target gas and converts the light beam into a target electric signal, and the target electric signal enters the DSP microprocessor as calibration data.
The present invention in a preferred example may be further configured such that a second amplification circuit is connected between the second photodetector and the second demodulation circuit.
The invention may further be configured in a preferred example, a beam splitter is disposed on a light path of the light beam emitted from the laser emitter, and the light beam is partially emitted to the target position and partially emitted to the first sample cell after passing through the beam splitter.
By adopting the technical scheme, the beam splitter divides the laser beam emitted by the laser emitter into two paths, one path of the laser beam is emitted to the position of the target to detect the position of the target, and the other path of the laser beam is emitted to the first sample pool to generate the electric signal of the target.
The present invention may in a preferred example be further arranged such that the beam path to the target location is arranged in the second sample cell.
Through adopting above-mentioned technical scheme, the effect of second sample cell lies in guaranteeing that signal output when first photoelectric detector normally works to get rid of first photoelectric detector fault state when not having methane leakage.
The invention may further be configured in a preferred example, where the light beams after passing through the beam splitter are provided with collimators.
By adopting the technical scheme, the collimator is used for coupling light into a required device with maximum efficiency.
The invention may further be configured in a preferred example, that the first photodetector is mounted on a light beam receiving cylinder, the first photodetector is mounted at a central position of one end of the light beam receiving cylinder, a plano-convex lens is mounted at the other end of the light beam receiving cylinder, a spherical surface of the plano-convex lens is arranged opposite to the first photodetector, and the reflected light beam is focused on the first photodetector through the plano-convex lens.
By adopting the technical scheme, the plano-convex lens has a focusing function on the light beam, so that the reflected light beam is focused on the first photoelectric detector.
In a preferred example, the present invention may be further configured such that both surfaces of the plano-convex lens are provided with antireflection films.
By adopting the technical scheme, the light transmittance of the plano-convex lens is improved.
In a preferred example, the present invention may be further configured that a first amplifying circuit and a first demodulating circuit are connected between the first photodetector and the DSP microprocessor, the first amplifying circuit is connected to the first photodetector, and the first demodulating circuit is connected to the DSP microprocessor after being connected to the first amplifying circuit.
In summary, the laser spectrum detection device for the petrochemical multidimensional sensing inspection robot provided by the invention has at least one of the following beneficial technical effects:
1. controlling a laser transmitter to transmit laser with a specific wavelength through a laser control unit; part of the laser beam is shot to the position of the target, part of the laser beam is intercepted by the calibration unit, and the light beam intercepted by the calibration unit generates a target electric signal and is sent to the DSP microprocessor for calibrating the light beam reflected by the position of the target; the light beam reflected back after the light beam is emitted to the target position is absorbed by the first photoelectric detector, converted into a target electric signal and sent to the DSP microprocessor, and the DSP microprocessor carries out operation processing on the target electric signal and the target electric signal, namely, the target electric signal is calibrated through the calibration electric signal, so that whether methane gas leaks from the target position is judged. The remote gas detection is realized, the safety coefficient is high, and the corresponding speed is high;
2. the second sample cell is used for ensuring that a signal is output when the first photoelectric detector works normally, so that the fault state of the first photoelectric detector is eliminated when no methane leaks.
Drawings
Fig. 1 is a schematic structural diagram of a laser spectrum detection device for a petrochemical multi-dimensional sensing inspection robot provided by the invention.
In the figure, 1, a laser transmitter; 2. a laser control unit; 3. a first photodetector; 4. a calibration unit; 5. a DSP microprocessor; 20. a laser driving unit; 21. a signal generator; 22. a modulation circuit; 31. a first amplifying circuit; 32. a first demodulation circuit; 41. a first sample tank; 42. a second photodetector; 43. a second demodulation circuit; 44. a second amplifying circuit; 6. a beam splitter; 7. a collimator; 8. a light beam receiving barrel; 81. a plano-convex lens; 9. a second sample cell.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a laser spectrum detection device for a petrochemical multidimensional sensing inspection robot, which comprises the following components as shown in figure 1:
the laser transmitter 1 is used for transmitting light beams with specific wavelengths to a target position, is applied to a petrochemical multidimensional sensing inspection robot, and is used in petrochemical fields such as oil fields and the like;
laser control unit 2 is connected with laser emitter 1 for send test signal, and control laser emitter 1 work, specifically include: the laser driving unit 20 is connected with the laser emitter 1 to drive the laser emitter 1 to act, the signal generator 21 is connected with the laser driving unit 20 and used for sending out a test signal, and the modulation circuit 22 is connected between the signal generator 21 and the laser driving unit 20;
the first photoelectric detector 3 is used for absorbing the light beam reflected by the target position and converting the light beam into a target electric signal, and the InGaAs detector is selected as the first photoelectric detector 3;
the calibration unit 4 receives a part of light beams emitted by the laser emitter 1 and generates a calibration electric signal;
and the DSP microprocessor 5 is connected with the signal generator 21 of the laser control unit 2, the first photoelectric detector 3 and the calibration unit 4, and is used for realizing the operation processing of the electric signals so as to calibrate the target electric signals through the calibration electric signals.
In this embodiment of the invention, for the detection of methane gas, the spectral wavelength corresponding to methane gas is 1654nm, and therefore, the laser transmitter 1 is first tuned to emit a beam of 1654nm wavelength, and then the laser transmitter 1 is controlled by the laser control unit 2 to emit 1654nm wavelength laser light; part of the laser beam is emitted to the position of the target, part of the laser beam is intercepted by the calibration unit 4, the light beam intercepted by the calibration unit 4 generates a target electric signal, and the target electric signal is sent to the DSP microprocessor 5 and used for calibrating the light beam reflected by the position of the target; the light beam reflected back after the light beam is emitted to the target position is absorbed by the first photoelectric detector 3, converted into a target electric signal and sent to the DSP microprocessor 5, the DSP microprocessor 5 carries out operation processing on the target electric signal and the target electric signal, namely, the target electric signal is calibrated through the calibration electric signal, and therefore whether methane gas leaks from the target position is judged. The gas detection device realizes remote gas detection, has high safety factor and high corresponding speed.
As shown in fig. 1, a beam splitter 6 is disposed on a light path of a light beam emitted from the laser emitter 1, and the light beam passes through the beam splitter 6 and is partially emitted to the target position and partially emitted to the calibration unit 4. The two beams after passing through the beam splitter 6 are respectively provided with collimators 7 so as to couple the light into the next device with maximum efficiency.
As shown in fig. 1, the calibration unit 4 includes:
a first sample cell 41 for storing a sample for detecting a target gas, in this embodiment of the present invention, methane gas;
a second photodetector 42 for absorbing the light beam passing through the first sample cell 41 after detecting the target gas and converting the light beam into a target electrical signal, in this embodiment of the present invention, the second photodetector 42 may be a mid-infrared photodiode detector PD, so that it has a higher sensitivity;
a second demodulation circuit 43 connected between the second photodetector 42 and the DSP microprocessor 5; and a second amplification circuit 44 connected between the second photodetector 42 and the second demodulation circuit 43.
The light beam coupled into the first sample cell 41 by the collimator 7 is emitted to the second photodetector 42, the second photodetector 42 absorbs the light beam passing through the first sample cell 41 after detecting the target gas and converts the light beam into a target electrical signal, and the target electrical signal is amplified and demodulated by the second amplifying circuit 44 and the second demodulating circuit 43 and then enters the DSP microprocessor 5 as calibration data.
As shown in fig. 1, the light beam directed to the target position is optically arranged in the second sample cell 9, and the sample gas in the second sample cell 9 is identical to the sample gas in the first sample cell 41. A first amplifying circuit 31 and a first demodulating circuit 32 are connected between the first photoelectric detector 3 and the DSP microprocessor 5, the first amplifying circuit 31 is connected with the first photoelectric detector 3, and the first demodulating circuit 32 is connected to the DSP microprocessor 5 after being connected with the first amplifying circuit 31. The light beam coupled into the first sample cell 41 through the collimator 7 is emitted to a target position and then is reflected to the first photoelectric detector 3 in a diffused manner, the first photoelectric detector 3 absorbs the light beam reflected by the target position and converts the light beam into a target electric signal, the target electric signal is sent to the DSP microprocessor 5 to be compared with calibration data (namely the target electric signal), if the target electric signal is the same as the target electric signal, methane gas does not leak from the target position, if the target electric signal is smaller than the target electric signal, methane gas leaks from the target position, and if the difference between the target electric signal and the target electric signal is larger, the methane concentration at the target position is larger. The second sample cell 9 therefore serves to ensure that a signal is output when the first photodetector 3 is operating properly, thereby eliminating a fault condition of the first photodetector 3 when there is no methane leak.
As shown in fig. 1, the first photodetector 3 is mounted on the light beam receiving cylinder 8, the first photodetector 3 is mounted at the center of one end of the light beam receiving cylinder 8, the other end of the light beam receiving cylinder 8 is mounted with a plano-convex lens 81, and the spherical surface of the plano-convex lens 81 is disposed opposite to the first photodetector 3, so that the reflected light beam is focused on the first photodetector 3 through the plano-convex lens 81. In addition, in order to increase the light transmittance of the planoconvex lens 81, antireflection films are provided on both surfaces of the planoconvex lens 81.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. Laser spectrum detection device for petrochemical multidimensional perception inspection robot, which is characterized by comprising:
a laser transmitter (1) for transmitting a light beam of a specific wavelength to a target position;
the laser control unit (2) is connected with the laser transmitter (1), sends out a test signal and controls the laser transmitter (1) to work;
a first photodetector (3) for absorbing the light beam reflected from the target position and converting the light beam into a target electrical signal;
the calibration unit (4) receives a part of light beams emitted by the laser emitter (1) and generates a calibration electric signal;
and the DSP microprocessor (5) is connected with the laser control unit (2), the first photoelectric detector (3) and the calibration unit (4) to realize the operation processing of the electric signals so as to calibrate the target electric signals through the calibration electric signals.
2. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot according to claim 1, wherein the laser control unit (2) comprises:
the laser driving unit (20) is connected with the laser emitter (1) to drive the laser emitter (1) to act;
the signal generator (21) is connected between the DSP microprocessor (5) and the laser driving unit (20) and sends out a test signal;
a modulation circuit (22) connected between the signal generator (21) and the laser driving unit (20).
3. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot according to claim 1, wherein the calibration unit (4) comprises:
a first sample cell (41) for storing a sample for detecting a target gas;
a second photodetector (42) for absorbing the light beam passing through the first sample cell (41) after detecting the target gas and converting the light beam into a target electric signal;
and the second demodulation circuit (43) is connected between the second photoelectric detector (42) and the DSP microprocessor (5).
4. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot is characterized in that a second amplification circuit (44) is connected between the second photoelectric detector (42) and the second demodulation circuit (43).
5. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot is characterized in that a beam splitter (6) is arranged on a light path of a light beam emitted by the laser emitter (1), and the light beam partially irradiates to a target position and partially irradiates to the first sample pool (41) after passing through the beam splitter (6).
6. The laser spectrum detection device for the petrochemical multi-dimensional perception inspection robot is characterized in that a light beam path which is shot to the position of the target is arranged on the second sample cell (9).
7. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot according to claim 5, wherein the light beams passing through the beam splitter (6) are provided with collimators (7).
8. The laser spectrum detection device for the petrochemical multidimensional perception inspection robot according to any one of claims 1 to 7, wherein the first photoelectric detector (3) is installed on a light beam receiving cylinder (8), the first photoelectric detector (3) is installed at the center of one end of the light beam receiving cylinder (8), a plano-convex lens (81) is installed at the other end of the light beam receiving cylinder (8), the spherical surface of the plano-convex lens (81) faces away from the first photoelectric detector (3), and the reflected light beam is focused on the first photoelectric detector (3) through the plano-convex lens (81).
9. The laser spectrum detection device for the oil chemical industry multi-dimensional perception inspection robot as claimed in claim 8, wherein antireflection films are arranged on two sides of the plano-convex lens (81).
10. The laser spectrum detection device for the petrochemical multidimensional sensing inspection robot according to any one of claims 1 to 7, wherein a first amplification circuit (31) and a first demodulation circuit (32) are connected between the first photoelectric detector (3) and the DSP microprocessor (5), the first amplification circuit (31) is connected with the first photoelectric detector (3), and the first demodulation circuit (32) is connected with the first amplification circuit (31) and then connected to the DSP microprocessor (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010296737.8A CN111474113A (en) | 2020-04-15 | 2020-04-15 | Laser spectrum detection device for petrochemical multi-dimensional sensing inspection robot |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010296737.8A CN111474113A (en) | 2020-04-15 | 2020-04-15 | Laser spectrum detection device for petrochemical multi-dimensional sensing inspection robot |
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| CN111474113A true CN111474113A (en) | 2020-07-31 |
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| CN202010296737.8A Pending CN111474113A (en) | 2020-04-15 | 2020-04-15 | Laser spectrum detection device for petrochemical multi-dimensional sensing inspection robot |
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- 2020-04-15 CN CN202010296737.8A patent/CN111474113A/en active Pending
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