CN118032682A - Laser methane remote measuring instrument - Google Patents
Laser methane remote measuring instrument Download PDFInfo
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- CN118032682A CN118032682A CN202410233158.7A CN202410233158A CN118032682A CN 118032682 A CN118032682 A CN 118032682A CN 202410233158 A CN202410233158 A CN 202410233158A CN 118032682 A CN118032682 A CN 118032682A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 239000000523 sample Substances 0.000 claims abstract description 44
- 230000003287 optical effect Effects 0.000 claims abstract description 40
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000010521 absorption reaction Methods 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000005494 condensation Effects 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 24
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 description 1
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to the field of methane detection devices, and particularly discloses a laser methane telemetry instrument, which comprises a detector, wherein one end of the detector is provided with a probe structure unit, and the probe structure unit comprises: the optical path accepting element, optical path transmitting element, circuit control unit, laser unit, the one end of probe structure unit is located the internally mounted of detector and has the core machine, and the core machine includes: the device comprises a central processing unit, an infrared laser control circuit, a laser emitting circuit and a temperature control unit; the optical path transmitting unit includes: a combiner and a collimator, wherein the collimator is used for emitting the received laser light for secondary condensation, the front end of the collimator is provided with a convex lens. The laser is concentrated and emitted by the collimator for the second time, the front end of the collimator utilizes the high-precision convex lens to converge and emit light, the diameter of an external light spot is smaller than that of the light in a slender state, the secondary collimation is used for ensuring that the emitted light signal is strong enough, reducing the interference of sunlight on the received light signal and improving the signal to noise ratio.
Description
Technical Field
The invention relates to the field of methane detection devices, in particular to a laser methane telemetry instrument.
Background
Methane is a major component of various conventional and non-conventional clean fuel gases and many chemical process gases, and has wide application in industrial production and people's daily lives. Because methane is a typical inflammable and explosive gas, the leakage carelessly can cause disastrous results, the device has important significance for detecting methane leakage, methane is widely distributed in nature, the laser methane monitor is a new generation online gas monitor, the concentration of methane can be continuously monitored for a long time in severe environments such as wind, rain, thunder and dust, when the concentration of methane on site exceeds a preset limit value, the device gives out the gas concentration detected in real time and gives an alarm, when light is transmitted in the atmosphere, the transmission medium absorbs light selectively, different gas molecules have intrinsic infrared absorption spectrums, the central wavelength lambda 1 is the intrinsic wavelength of the combustible gas, the wavelength lambda 2 is the extrinsic wavelength, the light of the two wave bands passes through the same transmission path, the influence of the scattering attenuation on consistency can be ensured, the difference of the extrinsic absorption on the light intensity of the two wave bands is maximally stabilized, when the combustible gas leakage occurs in a monitored area, infrared light of a transmitter is absorbed by the combustible gas, the infrared light of the transmitter is enabled to be reduced by the relevant infrared light intensity of a receiving end, and the infrared light is enabled to be transmitted to a relay to the alarm, and the alarm information is output to the alarm is transmitted to the alarm through the alarm when the relay receives the alarm and the alarm information is transmitted to the alarm.
However, the current methane detectors on the market are easy to influence the detection effect due to the increase of the beam width when detecting the leakage points at a longer distance.
Disclosure of Invention
Aiming at the existing problems, the invention provides a laser methane telemetry instrument, and the device can effectively solve the problems in the background technology by being matched with the device.
In order to solve the problems, the invention adopts the following technical scheme:
The utility model provides a laser methane telemetering instrument, includes the detector, probe structural unit is installed to the one end of detector, probe structural unit includes: the optical path receiving unit, the optical path transmitting unit, the circuit control unit, the laser unit, the one end of probe structure unit is located the internally mounted of detector has the core machine, the core machine includes: the device comprises a central processing unit, an infrared laser control circuit, a laser emitting circuit and a temperature control unit;
The temperature control unit includes: a circuit for controlling pressure and temperature acquisition and a circuit for controlling the temperature of the laser;
The circuit control unit is formed by integrating a signal receiving and amplifying unit, a laser emitting unit, a main control unit, a red light control unit, a temperature control unit, an internal pressure and temperature acquisition unit;
the optical path transmitting unit includes: the light source comprises a combiner and a collimator, wherein the collimator is used for emitting received laser light in a secondary condensing mode, a convex lens is arranged at the front end of the collimator, the collimator is matched with the convex lens to converge emitted light, the emitted light is sufficiently strong through secondary collimation of the collimator, interference of sunlight on the received light is reduced, and signal to noise ratio is improved.
As still further aspects of the invention: the detector is located near one side of the probe structure unit and is provided with a standard air chamber, a display window is arranged on the side surface of the detector above the core machine, an electric control button is arranged on the upper surface of the display window, a support is arranged on the outer side of the detector, and a rear protecting sleeve is arranged at one end of the detector, which is far away from the probe structure unit.
As still further aspects of the invention: the detector is located away from the one end internally mounted of probe structural unit has the battery, the silica gel lag is installed in the outside of battery, the nameplate is installed in the outside of probe structural unit.
As still further aspects of the invention: when the detector and the standard air chamber are used, a certain distance l is preset between the detector and the standard air chamber, and the detector is used for detecting 100 multiplied by 10-6CH 4m methane gas to observe whether the methane gas can be detected;
After the numerical value of the detector is cleared and stabilized in clean air, the detector is placed on the support, so that the detector and the standard air chamber are kept horizontal, the probe structural unit is precisely attached to the standard air chamber, the detector is started to continuously measure for 10 seconds, 3 times of measured values are read in 10 seconds, an average value is obtained, and a basic error is calculated according to the following formula; wherein:
A X -basic error,%;
Average of the measured values, 10-6ch4·m;
c, standard gas concentration, 10-6CH4;
l is the internal length of the air chamber, and the unit is meter;
The value of l is: the thickness of the material is 10m,
The L value is: 1m;
As still further aspects of the invention: the central processing unit is externally connected with a power supply data wire and a signal receiving circuit, a voltage conversion circuit is connected between the external power supply data wire and the central processing unit, and a signal amplifying circuit is connected between the signal receiving circuit and the central processing unit.
As still further aspects of the invention: in a specific infrared wavelength, the light path receiving unit receives the light signal and compares the light signal with the light signal when in transmission, the light signal is absorbed in proportion to the methane concentration in the tested environment, the received signal is compared with the signal when in transmission to obtain the absorption amount, so that the concentration value of the tested environment gas is calculated, and the final concentration value also compensates the environment temperature and the environment pressure.
As still further aspects of the invention: the display window is electrically connected with the core machine, and the probe structure unit is meshed and fixed with the detector.
As still further aspects of the invention: a telescopic bracket is arranged below the standard air chamber
As still further aspects of the invention: the Bluetooth module is used for transmitting signals between the light path receiving unit and the light path transmitting unit.
As still further aspects of the invention: the infrared laser control circuit, the laser emission circuit and the temperature control unit are electrically connected with the central processing unit, the signal receiving and amplifying unit is used for converting received optical signals into electric signals and amplifying weak signals, the red light control unit compares the optical signals received by the receiving module at a specific infrared wavelength with the optical signals transmitted by the laser emission unit, the optical signals are absorbed in proportion to the methane concentration in the tested environment, and the received signals are compared with the signals transmitted to obtain the absorption quantity, so that the concentration value of the tested environmental gas is calculated.
Compared with the prior art, the invention has the beneficial effects that:
1. the laser is concentrated and emitted by the collimator for the second time, the front end of the collimator utilizes the high-precision convex lens to converge and emit light, the diameter of an external light spot is smaller than that of the light in a slender state, the secondary collimation is used for ensuring that the emitted light signal is strong enough, reducing the interference of sunlight on the received light signal and improving the signal to noise ratio.
2. The integrated probe front window is designed with a film coating filter to filter stray light in sunlight, a signal receiving and amplifying unit receives an optical signal at a specific infrared wavelength and compares the optical signal with an optical signal during transmission, the optical signal is absorbed in proportion according to the methane concentration in a tested environment, the received signal is compared with the signal during transmission to obtain the absorption capacity, so that the concentration value of the tested environment gas is calculated, the final concentration value also compensates the environment temperature and the environment pressure, and the measurement result is ensured.
Drawings
FIG. 1 is a schematic diagram of a laser methane telemetry instrument;
FIG. 2 is a partial cross-sectional view of a sonde in a laser methane telemetry instrument;
FIG. 3 is a schematic diagram of an effective detection distance test arrangement in a laser methane telemetry;
FIG. 4 is a basic error testing arrangement in a laser methane telemetry;
FIG. 5 is a schematic diagram of the structure of an adjustment mechanism unit in the laser methane telemetry instrument;
fig. 6 is a schematic diagram of a circuit control unit in a laser methane telemetry instrument.
In the figure: 1. a detector; 2. a rear protective sleeve; 3. a display window; 4. a probe structural unit; 5. a bracket; 6. a standard air chamber; 7. a battery; 8. a silica gel protective sleeve; 9. an electric control button; 10. a core machine; 11. a nameplate.
Detailed Description
The following description of the embodiments of the present invention will be made more complete and clear to those skilled in the art, and it is intended that the embodiments described are only some, but not all, of the embodiments of the present invention and that all other embodiments may be made without inventive faculty by those skilled in the art based on the embodiments of the present invention.
In the description of the present specification, reference to the terms "present embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention, and in the specification, schematic representations of the terms described above do not necessarily refer to the same embodiment or example, and the particular feature, structure, material, or characteristic described may be combined in any one or more embodiments or examples in a suitable manner.
As shown in fig. 1 to 6, the present embodiment provides a laser methane telemetry instrument including a probe 1, a probe structure unit 4 is mounted at one end of the probe 1, and the probe structure unit 4 includes: the optical path accepting element, the optical path transmitting element, the circuit control unit, the laser unit, the one end of probe structure unit 4 is located the internally mounted of detector 1 and has core machine 10, and core machine 10 includes: the device comprises a central processing unit, an infrared laser control circuit, a laser emitting circuit and a temperature control unit;
the temperature control unit includes: a circuit for controlling pressure and temperature acquisition and a circuit for controlling the temperature of the laser;
The circuit control unit is formed by integrating a signal receiving and amplifying unit, a laser emitting unit, a main control unit, a red light control unit, a temperature control unit and an internal pressure and temperature acquisition unit, wherein the signal receiving and amplifying unit is used for converting an accepted optical signal into an electric signal and amplifying a weaker signal, the red light control unit is used for comparing the optical signal received by a receiving module at a specific infrared wavelength with the optical signal sent by the laser emitting unit, the optical signal is absorbed in proportion according to the methane concentration in a tested environment, and the absorption amount of the received signal is obtained when the received signal is compared with the signal sent, so that the concentration value of the tested environmental gas is calculated;
The optical path transmitting unit includes: the device comprises a combiner and a collimator, wherein the collimator is used for secondarily condensing and emitting received laser, the front end of the collimator is provided with a convex lens, the collimator is matched with the convex lens to collect emitted light, the secondary collimation of the collimator is used for guaranteeing that emitted light signals are strong enough, reducing interference of sunlight on the received light signals and improving signal to noise ratio, a Bluetooth module is connected between an optical path receiving unit and an optical path emitting unit and a display window 3 and used for transmitting signals between the optical path receiving unit and the optical path emitting unit, and an infrared laser control circuit, a laser emitting circuit and a temperature control unit are electrically connected with a central processing unit;
The central processing unit adopts a dual-core processor, one processor is a DSP processor and is used for floating point operation and is used for accurately testing gas concentration at high speed, the other processor is used for functional control of the whole system, when the detector 1 and the standard gas chamber 6 are used, a certain interval l is preset between the detector 1 and the standard gas chamber 6, the detector 1 is used for detecting 100 multiplied by 10-6CH4.m methane gas, and whether the methane gas can be detected is observed;
After the numerical value of the detector 1 is cleared and stabilized in clean air, the detector 1 is placed on a bracket 5, so that the detector 1 and a standard air chamber 6 are kept horizontal, a probe structure unit 4 is precisely attached to the standard air chamber 6, the detector 1 is started to continuously measure for 10 seconds, 3 times of measured values are read within 10 seconds, an average value is obtained, and a basic error is calculated according to the following formula; wherein:
A X -basic error,%;
Average of the measured values, 10-6ch4·m;
c, standard gas concentration, 10-6CH4;
l is the internal length of the air chamber, and the unit is meter;
the value of l is: 10m;
The L value is: 1m;
The central processing unit is externally connected with a power supply data wire and a signal receiving circuit, a voltage conversion circuit is connected between the external power supply data wire and the central processing unit, and a signal amplifying circuit is connected between the signal receiving circuit and the central processing unit;
The light path receiving unit receives the light signal in the specific infrared wavelength and compares the light signal with the light signal when in transmission, the light signal is absorbed in proportion according to the methane concentration in the tested environment, the received signal is compared with the signal when in transmission, the absorption amount is obtained, the concentration value of the tested environment gas is calculated, and the final concentration value also compensates the environment temperature and the environment pressure.
As shown in fig. 2-4, in this embodiment, a standard air chamber 6 is disposed on one side of the probe 1 near the probe structure unit 4, a display window 3 is mounted on the side surface of the core machine 10, an electric control button 9 is mounted on the upper surface of the display window 3, a support 5 is mounted on the outer side of the probe 1, a rear protection sleeve 2 is mounted on one end of the probe 1 far from the probe structure unit 4, a battery 7 is mounted on the inner side of one end of the probe 1 far from the probe structure unit 4, a silica gel protection sleeve 8 is mounted on the outer side of the battery 7, a nameplate 11 is mounted on the outer side of the probe structure unit 4, the display window 3 is electrically connected with the core machine 10, the probe structure unit 4 is meshed and fixed with the probe 1, and a telescopic support is mounted below the standard air chamber 6.
The working principle of the invention is as follows: the probe structure unit 4 of the detector 1 sends laser beams to a far reflecting surface, the laser paths irradiate above possible leakage points, the circuit control unit receives feedback signals for calculation processing, the design of the detector 1 is based on the TDLAS principle, the molecular structure based on methane has absorption property for light with specific wavelength, if methane gas clusters exist on the light path, the emitted laser is partially absorbed, the circuit control unit can detect the light signals and the reduction of the molecular number of the gas clusters on the light path in proportion, the accumulated methane concentration content can be quickly calculated, an alarm is triggered, the core of the probe structure unit 4 is a high-precision laser, the laser is secondarily condensed and emitted by a collimator, the front end of the collimator utilizes a high-precision convex lens to converge the emitted light, the spot diameter beyond 50M is smaller than 15cm, the secondary collimation is used for guaranteeing that the emitted light signals are strong enough, the interference of sunlight on the received light signals is reduced, the signal to noise ratio is improved, a film coating filter is designed on the front window of the probe, the specific wavelength signal receiving amplifying unit receives the light signals and compares the light signals with the light signals in the transmission time, the light signals in proportion, the concentration of the detected light signals in the light paths is measured, the proportion to the light concentration of the methane signals in the test environment is measured, the temperature values are further compared, the ambient temperature values are obtained, and the ambient temperature values are further compared, and the ambient temperature values are obtained.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. Laser methane telemeter, including detector (1), its characterized in that, probe structural unit (4) is installed to the one end of detector (1), probe structural unit (4) include: the optical path receiving unit, the optical path transmitting unit, the circuit control unit, the laser unit, the one end of probe structure unit (4) is located the internally mounted of detector (1) has core machine (10), core machine (10) include: the device comprises a central processing unit, an infrared laser control circuit, a laser emitting circuit and a temperature control unit;
The temperature control unit includes: a circuit for controlling pressure and temperature acquisition and a circuit for controlling the temperature of the laser;
The circuit control unit is formed by integrating a signal receiving and amplifying unit, a laser emitting unit, a main control unit, a red light control unit, a temperature control unit, an internal pressure and temperature acquisition unit;
The optical path transmitting unit includes: the laser beam focusing device comprises a combiner and a collimator, wherein the collimator is used for secondarily focusing and emitting received laser beams, a convex lens is arranged at the front end of the collimator, and the collimator is matched with the convex lens to converge emitted light.
2. The laser methane telemetry instrument according to claim 1, characterized in that a standard air chamber (6) is arranged on one side of the detector (1) close to the probe structural unit (4), a display window (3) is arranged on the side surface of the detector (1) above the core machine (10), an electric control button (9) is arranged on the upper surface of the display window (3), a support (5) is arranged on the outer side of the detector (1), and a rear protective sleeve (2) is arranged on one end of the detector (1) far away from the probe structural unit (4).
3. The laser methane telemetry instrument according to claim 1, characterized in that the detector (1) is located at one end of the probe structure unit (4) far away from the probe structure unit, a battery (7) is internally mounted, a silica gel protective sleeve (8) is mounted on the outer side of the battery (7), and a nameplate (11) is mounted on the outer side of the probe structure unit (4).
4. The laser methane telemetry instrument according to claim 2, characterized in that when the instrument (1) and the standard gas chamber (6) are used, a certain distance l is preset between the instrument (1) and the standard gas chamber (6), and the instrument (1) is used for detecting 100 x 10-6CH 4-m methane gas to see whether the methane gas can be detected;
After the numerical value of the detector (1) is cleared and stabilized in clean air, the detector (1) is placed on the bracket (5), so that the detector (1) and the standard air chamber (6) are kept horizontal, the probe structural unit (4) is precisely attached to the standard air chamber (6), the detector (1) is started to continuously measure for 10 seconds, 3 times of measured values are read in 10 seconds, an average value is obtained, and a basic error is calculated according to the following formula; wherein:
A X -basic error,%;
Average of the measured values, 10-6ch4·m;
c, standard gas concentration, 10-6CH4;
l is the internal length of the air chamber, and the unit is meter;
The value of l is: the thickness of the material is 10m,
The L value is: 1m;
5. The laser methane telemetry instrument of claim 2, wherein the central processing unit is externally connected with a power supply data line and a signal receiving circuit, a voltage conversion circuit is connected between the external power supply data line and the central processing unit, and a signal amplifying circuit is connected between the signal receiving circuit and the central processing unit.
6. The laser methane telemetry instrument of claim 1 wherein the optical path receiving unit receives and compares the optical signal with the transmitted optical signal at a specific infrared wavelength, the optical signal is absorbed in proportion to the methane concentration in the environment to be tested, the received signal is absorbed in comparison with the transmitted signal, and thereby the concentration value of the measured ambient gas is calculated, and the final concentration value compensates for the ambient temperature and pressure.
7. The laser methane telemetry instrument according to claim 2, characterized in that the display window (3) is electrically connected with the core machine (10), and the probe structural unit (4) is meshed and fixed with the probe instrument (1).
8. The laser methane telemetry instrument according to claim 2, characterized in that a telescopic bracket is mounted below the standard air chamber (6).
9. The laser methane telemetry instrument according to claim 2, characterized in that a bluetooth module is connected between the optical path receiving unit and the optical path transmitting unit and the display window (3), and the bluetooth module is used for transmitting signals between the optical path receiving unit and the optical path transmitting unit.
10. The laser methane telemetry instrument according to claim 1, wherein the infrared laser control circuit, the laser emission circuit and the temperature control unit are all electrically connected with the central processing unit, the signal receiving and amplifying unit is used for converting the received optical signal into an electrical signal and amplifying the weaker signal, the red light control unit compares the optical signal received by the receiving module at a specific infrared wavelength with the optical signal transmitted by the laser emission unit, the optical signal is absorbed in proportion to the methane concentration in the tested environment, and the absorption amount of the received signal is obtained when the received signal is compared with the signal transmitted, so that the concentration value of the tested environmental gas is calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410233158.7A CN118032682A (en) | 2024-03-01 | 2024-03-01 | Laser methane remote measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410233158.7A CN118032682A (en) | 2024-03-01 | 2024-03-01 | Laser methane remote measuring instrument |
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| Publication Number | Publication Date |
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| CN118032682A true CN118032682A (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410233158.7A Pending CN118032682A (en) | 2024-03-01 | 2024-03-01 | Laser methane remote measuring instrument |
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| CN (1) | CN118032682A (en) |
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- 2024-03-01 CN CN202410233158.7A patent/CN118032682A/en active Pending
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