CN108037094A - A kind of fuel gas laser telemetry system and method - Google Patents
A kind of fuel gas laser telemetry system and method Download PDFInfo
- Publication number
- CN108037094A CN108037094A CN201711242889.4A CN201711242889A CN108037094A CN 108037094 A CN108037094 A CN 108037094A CN 201711242889 A CN201711242889 A CN 201711242889A CN 108037094 A CN108037094 A CN 108037094A
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- China
- Prior art keywords
- laser
- signal
- laser signal
- reflected
- fuel gas
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Classifications
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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
-
- 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
- G01N21/55—Specular reflectivity
Abstract
The invention discloses a kind of fuel gas laser telemetry system and method, wherein system includes：Laser beam emitting device, target area is passed through for launching laser signal；The laser signal that reflection unit is reflected back is received, calculates the signal strength of transmitting laser signal and reflected laser signals；The signal strength of laser signal will be launched with the difference of the signal strength of reflected laser signals as a result, being compared with pre-stored warning difference table, the early warning of corresponding grade is sent according to comparison result.Said system and method are easy to use, effectively hazardous gas can be detected, and carry out corresponding to hazard rating progress early warning, have very high practicality.
Description
Technical field
The present invention relates to a kind of fuel gas laser telemetry system and method.
Background technology
With the development of society, the continuous improvement of production technology level, gas factory, gas pressure regulation station, gas pipeline pass
The industry production such as defeated, chemical industry, environmental protection power is continuously improved, and production safety demand is also more and more aobvious urgent；Winter is stepped into addition, working as
When, buildings in general all can door and window close, cause ventilation not smooth, especially using the place of combustion gas, security risk is even more to increase.
The presence of these hazards causes the security of the lives and property of social stability and people certain threat.Urgent need wants a kind of energy
It is enough hazardous gas is detected, and pre-warning system solves the problems, such as this.
The content of the invention
For above-mentioned technical problem, the present invention provide it is a kind of it is simple in structure, easy to use, can effectively to hazardous gas into
Row detection, and carry out corresponding to fuel gas laser telemetry system and method that hazard rating carries out early warning.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of fuel gas laser telemetry is provided
System, including：
Laser beam emitting device, target area is passed through for launching laser signal；
The laser signal that reflection unit is reflected back is received, the signal for calculating transmitting laser signal and reflected laser signals is strong
Degree；
By the difference of the signal strength of signal strength and the reflected laser signals of the transmitting laser signal as a result, with
Pre-stored warning difference table is compared, and the early warning of corresponding grade is sent according to comparison result.
The present invention uses above technical scheme, and the technique effect reached is：Fuel gas laser telemetry provided by the invention
The laser beam emitting device of system can launch laser signal and pass through target area, receive the laser signal that reflection unit is reflected back, also
The signal strength of transmitting laser signal and reflected laser signals can be calculated, according to transmitting laser signal intensity and reflected laser signals
Difference between intensity is as a result, the warning difference table that combination is pre-stored, sends the early warning of corresponding grade.Said system can be effective
The hazardous gas of target area is detected, and correspond to the early warning of danger classes, there is very high practicality.
More preferably, in the above-mentioned technical solutions, the laser beam emitting device includes：
Semiconductor laser, for generating laser signal, the laser signal of generation is launched by optical transmitting and receiving telescope
To target area；
The laser receiver, is connected with data processing equipment, the laser being reflected back for receiving the reflection unit
Signal, the reflected laser signals received are sent to the data processing equipment；
The data processing equipment, for the signal strength to the transmitting laser signal and the reflected laser signals
Signal strength carries out difference operation, obtains the difference result.
More preferably, in the above-mentioned technical solutions, the laser beam emitting device further includes：
Laser temperature and current control device, are connected with the semiconductor laser, swash for adjusting the semiconductor
The operating temperature and operating current of light device, realize the adjusting of the laser signal wavelength to semiconductor laser output.
More preferably, in the above-mentioned technical solutions, the laser beam emitting device further includes：
Erbium-doped fiber amplifier, is connected with the semiconductor laser and the optical transmitting and receiving telescope, for receiving
To laser signal be amplified, amplified laser signal is launched to target area by the optical transmitting and receiving telescope.
A kind of fuel gas laser telemetry method is additionally provided, is comprised the following steps：
Obtain the laser signal through target area and return；
The signal strength of the laser signal launched and the reflected laser signals received is calculated, laser signal will be launched
The signal strengths of signal strength and the reflected laser signals do difference operation, by difference result and pre-stored warning difference
Table is compared, and the early warning of corresponding grade is sent according to comparison result.
The present invention uses above technical scheme, and the technique effect reached is：Fuel gas laser telemetry provided by the invention
The meeting of method obtains the laser signal through target area and return, calculates the signal of transmitting laser signal and reflected laser signals
Intensity, according to the difference between transmitting laser signal intensity and reflected laser signals intensity as a result, combining pre-stored warning difference
Table, sends the early warning of corresponding grade.Said system effectively can be detected the hazardous gas of target area, and carry out pair
The early warning of danger classes is answered, there is very high practicality.
More preferably, in the above-mentioned technical solutions, before described obtain through the laser signal of target area and return, also
Including：
According to the species of gas to be detected in the target area, the wavelength for the laser signal launched is adjusted.
Brief description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the schematic block diagram of fuel gas laser telemetry system provided by the invention；
Fig. 2 is the indicative flowchart of fuel gas laser telemetry method provided by the invention.
Embodiment
As shown in Figure 1, fuel gas laser telemetry system provided by the invention, including：
Laser beam emitting device, target area is passed through for launching laser signal；
The laser signal that reflection unit is reflected back is received, the signal for calculating transmitting laser signal and reflected laser signals is strong
Degree；
By launch laser signal signal strength and reflected laser signals signal strength difference as a result, with it is pre-stored
Warning difference table is compared, and the early warning of corresponding grade is sent according to comparison result.
After thering is certain absorption, laser to pass through target area back and forth to laser signal intensity due to different gas,
If being absorbed by certain laser signal intensity there are specific hazardous gas in target area, final laser beam emitting device connects
Received reflected laser signals intensity can be smaller than launching the signal strength of laser, and the part that laser signal intensity reduces is target
The part that gas absorbs in region, the gas of various concentrations is different to the degree of absorption of laser signal, according to front and rear laser signal
Front and rear reduction degree, the degree of absorption with reference to various concentrations gas to laser signal, it may be determined that current dangerous gas it is dense
Degree.The system can be to CO, HCL, H2S、CH4It is detected Deng gas, to CO, HCL, H2S and CH4Minimum detection limit
Respectively 40ppm, 0.2ppm, 20ppm and 36ppm, wherein 1ppm correspond to percentage as 0.0001%.Reached in above-mentioned gas concentration
To after detection limit, the early warning of corresponding grade will be sent.With CH4Exemplified by, work as CH4Concentration is less than 36ppm, CH4Concentration can be with
Ignore, launch laser signal intensity and front and rear reduce of reflected laser signals intensity can be ignored, i.e., less is 0；When
CH4Concentration is more than 36ppm, less than 360ppm when, prompted for CH4 leakages, it is noted that safety, corresponding front and rear laser signal are strong
Degree decrement is one thousandth；Work as CH4Concentration is more than 360ppm, during less than 3600ppm, prompts have CH4Gas leaks, and sends one
Level early warning, corresponding front and rear laser signal strength reduction is 5/1000ths；Work as CH4Concentration be more than 5%, less than 15% when, carry
Show that CH4 concentration reaches explosion critical value, even if please be evacuate, take care, corresponding front and rear laser signal strength reduction
For 1 percent.4 grades can be all divided into for the detectable concentration of each gas, concentration difference is generally 10 between each grade
Integral multiple, correspond to safe condition respectively, have gas leakage, level-one early warning and an early warning explosion, it is corresponding before and after laser signal reduce
Value is respectively 0, one thousandth, 5/1000ths and 1 percent.
As a kind of embodiment, laser beam emitting device includes：
Semiconductor laser, for generating laser signal, the laser signal of generation is launched by optical transmitting and receiving telescope
To target area；
Wherein：Optical transmitting and receiving telescope preferably can carry out convergence transmitting to laser signal；
Laser receiver, is connected with data processing equipment, and the laser signal being reflected back for receiving reflection unit, will connect
Received reflected laser signals are sent to data processing equipment；
Data processing equipment, for being carried out to launching the signal strength of laser signal and the signal strength of reflected laser signals
Difference operation, obtains difference result.
As a kind of embodiment, laser beam emitting device further includes：
Laser temperature and current control device, are connected with semiconductor laser, for adjusting the work of semiconductor laser
Make temperature and operating current, realize the adjusting of the laser signal wavelength of noise spectra of semiconductor lasers output.
Wherein：The size of temperature and electric current when the wavelength of laser signal works with laser beam emitting device has relation, passes through
The temperature and electric current when laser beam emitting device works are adjusted, the wavelength of laser signal can be adjusted.For example, work as semiconductor laser
When operating temperature raises, the wavelength of laser signal can the length of side, the threshold electric current of semiconductor laser can with the rise of temperature and
Become larger.Since different hazardous gas is different to the trap of the laser signal of different wave length, by adjusting generation
The wavelength of laser signal, expands the scope of application of laser gas detecting system to a certain extent, can be to a variety of different
Hazardous gas is detected.
As a kind of embodiment, laser beam emitting device further includes：
Erbium-doped fiber amplifier, is connected with semiconductor laser and optical transmitting and receiving telescope, for docking received laser
Signal is amplified, and amplified laser signal is launched to target area by optical transmitting and receiving telescope.Erbium-doped fiber amplifier
Device effectively can be amplified laser signal, the stability during laser signal transmission can effectively be ensured, one
Determine to ensure that the accuracy of final result in degree.During being amplified to laser signal, certain energy is had
Loss, under normal circumstances can by laser signal amplify 2-3 times, so both may insure laser signal transmission stability and finally
As a result accuracy, will not be lost more energy, it is ensured that the permanent stable operation of system.
The present invention uses above technical scheme, and the technique effect reached is：Fuel gas laser telemetry provided by the invention
The laser beam emitting device of system can launch laser signal and pass through target area, receive the laser signal that reflection unit is reflected back, also
The signal strength of transmitting laser signal and reflected laser signals can be calculated, according to transmitting laser signal intensity and reflected laser signals
Difference between intensity is as a result, the warning difference table that combination is pre-stored, sends the early warning of corresponding grade.Said system can be effective
The hazardous gas of target area is detected, and correspond to the early warning of danger classes, there is very high practicality.
As shown in Fig. 2, present invention also offers a kind of fuel gas laser telemetry method, comprise the following steps：
Obtain the laser signal through target area and return；
The signal strength of the laser signal launched and the reflected laser signals received is calculated, laser signal will be launched
Signal strength and the signal strengths of reflected laser signals do difference operation, by difference result and pre-stored warning difference table into
Row compares, and the early warning of corresponding grade is sent according to comparison result.
More preferably, in the above-mentioned technical solutions, before obtaining through the laser signal of target area and return, also wrap
Include：
According to the species of gas to be detected in target area, the wavelength for the laser signal launched is adjusted.Due to different
Hazardous gas differs the degree of absorption of the laser signal of different wave length, by adjusting the wavelength for the laser signal launched,
The scope of hazardous gas detection is expanded to a certain extent, and applicability is wider.
The present invention uses above technical scheme, and the technique effect reached is：Fuel gas laser telemetry provided by the invention
The meeting of systems approach is obtained through target area and the laser signal that returns, calculates transmitting laser signal and reflected laser signals
Signal strength, according to the difference between transmitting laser signal intensity and reflected laser signals intensity as a result, combining pre-stored warning
Difference table, sends the early warning of corresponding grade.Said system effectively can be detected the hazardous gas of target area, go forward side by side
The early warning of the corresponding danger classes of row, has very high practicality.
It can be that professional and technical personnel in the field realize or use that the above embodiment, which is intended to illustrate the present invention, to above-mentioned
Embodiment is modified and be will be apparent for those skilled in the art, therefore the present invention includes but not limited to
The above embodiment, it is any to meet the claims or specification description, meet with principles disclosed herein and novelty,
The method of inventive features, technique, product, each fall within protection scope of the present invention.
Claims (6)
- A kind of 1. fuel gas laser telemetry system, it is characterised in that including：Laser beam emitting device, target area is passed through for launching laser signal；The laser signal that reflection unit is reflected back is received, calculates the signal strength of transmitting laser signal and reflected laser signals；By the difference of signal strength and the signal strength of the reflected laser signals of the transmitting laser signal as a result, with prestoring The warning difference table of storage is compared, and the early warning of corresponding grade is sent according to comparison result.
- 2. fuel gas laser telemetry system as claimed in claim 1, it is characterised in that the laser beam emitting device includes：Semiconductor laser, for generating laser signal, the laser signal of generation is launched to mesh by optical transmitting and receiving telescope Mark region；The laser receiver, is connected with data processing equipment, the laser signal being reflected back for receiving the reflection unit, The reflected laser signals received are sent to the data processing equipment；The data processing equipment, for the signal strength and the signal of the reflected laser signals to the transmitting laser signal Intensity carries out difference operation, obtains the difference result.
- 3. fuel gas laser telemetry system as claimed in claim 2, it is characterised in that the laser beam emitting device also wraps Include：Laser temperature and current control device, are connected with the semiconductor laser, for adjusting the semiconductor laser Operating temperature and operating current, realize to the semiconductor laser output laser signal wavelength adjusting.
- 4. fuel gas laser telemetry system as claimed in claim 3, it is characterised in that the laser beam emitting device also wraps Include：Erbium-doped fiber amplifier, is connected with the semiconductor laser and the optical transmitting and receiving telescope, received for docking Laser signal is amplified, and amplified laser signal is launched to target area by the optical transmitting and receiving telescope.
- A kind of 5. fuel gas laser telemetry method, it is characterised in that comprise the following steps：Obtain the laser signal through target area and return；The signal strength of the laser signal launched and the reflected laser signals received is calculated, the letter of laser signal will be launched Number intensity and the signal strength of the reflected laser signals do difference operation, by difference result and pre-stored warning difference table into Row compares, and the early warning of corresponding grade is sent according to comparison result.
- 6. fuel gas laser telemetry method as claimed in claim 5, it is characterised in that obtained described through target area And before the laser signal returned, further include：According to the species of gas to be detected in the target area, the wavelength for the laser signal launched is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711242889.4A CN108037094A (en) | 2017-11-30 | 2017-11-30 | A kind of fuel gas laser telemetry system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711242889.4A CN108037094A (en) | 2017-11-30 | 2017-11-30 | A kind of fuel gas laser telemetry system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108037094A true CN108037094A (en) | 2018-05-15 |
Family
ID=62094529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711242889.4A Pending CN108037094A (en) | 2017-11-30 | 2017-11-30 | A kind of fuel gas laser telemetry system and method |
Country Status (1)
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