CN212808047U - Sensor of combustible gas detection alarm for explosion dangerous place - Google Patents
Sensor of combustible gas detection alarm for explosion dangerous place Download PDFInfo
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- CN212808047U CN212808047U CN202021513243.2U CN202021513243U CN212808047U CN 212808047 U CN212808047 U CN 212808047U CN 202021513243 U CN202021513243 U CN 202021513243U CN 212808047 U CN212808047 U CN 212808047U
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Abstract
The utility model discloses a sensor of combustible gas detection alarm for explosion hazard place belongs to gas concentration monitoring technical field. The utility model discloses an outer shell, be equipped with protruding ball mirror, metal coating reflector panel, snoot in the shell, protruding ball mirror is connected with the special optic fibre first way of two passageways, the snoot is connected with the special optic fibre second way of two passageways, the special optic fibre first way of two passageways and the special optic fibre second way of two passageways send from the outer binary channels detector of shell and pass the shell again and get into in the shell. The utility model discloses light path system structure is succinct, and the circuit part of the gas of awaiting measuring and sensor is kept apart completely through the window, and electroless project organization has great improvement, convenient to popularize and use to the monitoring precision and the reliability of detector.
Description
Technical Field
The utility model belongs to the technical field of gas concentration monitoring, specifically be a sensor of combustible gas detection alarm for explosion hazard place.
Background
In the petrochemical industry, the storage of hazardous explosive chemicals such as: the places such as finished oil, hazardous chemicals and the like are classified as zero-order explosion danger places, such as cave depots, closed spaces and the like, the existence of power supply illumination, charged sensors and the like is strictly forbidden, and how to automatically and effectively monitor the spaces of the places is the research, namely, the electroless design is carried out on the basis of the places.
When a beam of light passes through a gas medium, part of the light energy is absorbed by the medium and attenuated, and the attenuation degree of the light energy has a direct relation with the concentration of the gas medium passing through and the optical path. When the concentration of the gas medium is stable, the longer the optical path is, the more obvious the light energy attenuation is; when the optical path is fixed, the higher the concentration of the gas medium is, the more obvious the light energy attenuation degree is, that is, the absorption law of light-Lambert-Beer (Lambert-Beer) is expressed by the expression that I (lambda) is equal to I0(λ)exp(μCL)。
Infrared spectroscopy is susceptible to environmental factors such as temperature, air flow, etc., and scattering, blocking by impurities, etc., also exist during the transmission of light energy. Therefore, the concentration of the gas to be measured cannot be accurately measured by only relying on a single optical path.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sensor of explosion hazard place used combustible gas detection alarm to solve the problem that provides among the above-mentioned background art.
The utility model adopts the technical scheme as follows:
the utility model provides a sensor of combustible gas detection alarm for explosion hazard place, includes the shell, its characterized in that: be equipped with protruding ball mirror, metal coating reflector panel, snoot in the shell, protruding ball mirror and the special optic fibre first way of two passageways are connected, the snoot is connected with the special optic fibre second way of two passageways, the special optic fibre first way of two passageways and the special optic fibre second way of two passageways send from the outer binary channels detector of shell and pass the shell again and get into in the shell.
The metal coating reflecting plate, the convex spherical lens and the light-gathering cover are arranged oppositely, and the metal coating reflecting plate is obliquely arranged.
The two-channel special optical fiber is transmitted by a first path and emits infrared light of 3.39 mu m to the convex spherical mirror.
A sapphire window is arranged in front of the convex spherical lens and the light-gathering cover in the shell.
The housing is constructed of an insulating material.
The shell is provided with a gas inlet through hole.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model adopts a reflection type light path structure, and the reflectivity of the metal coating reflection plate to the infrared band of 3-4.5 μm is not less than 95%.
The utility model discloses a dual-band measurement technique increases reference wave band all the way on single-band infrared monitoring's basis, and the selected gaseous wavelength that awaits measuring has the absorption peak to the infrared light is measuring wavelength, and another wavelength that does not have the absorptive capacity to the gaseous of awaiting measuring is reference wavelength, can the accurate concentration of testing the gaseous of awaiting measuring.
In conclusion, the optical path system is simple in structure, the gas to be detected is completely isolated from the circuit part of the sensor through the window, and the monitoring precision and reliability of the detector are greatly improved due to the non-electric design structure.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
the labels in the figure are: 1-a housing; 2-convex spherical lens; 3-metal coating reflecting plate; 4-a snoot; 5-two-channel special optical fiber circuit A; 6-two-channel special optical fiber circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
Example (b):
the utility model provides a sensor of combustible gas detection alarm for explosion hazard place, as figure 1, includes shell 1, be equipped with protruding ball mirror 2, metal coating reflector panel 3, snoot 4 in the shell 1, protruding ball mirror 2 is connected with the special optic fibre first way 5 of two passageways, snoot 4 is connected with the special optic fibre second way 6 of two passageways, the special optic fibre first way 5 of two passageways and the special optic fibre second way 6 of two passageways send from the outer binary channels detector of shell 1 and pass shell 1 again and get into in the shell.
The metal coating reflecting plate 3 is arranged opposite to the convex spherical lens 2 and the light-gathering shade 4, and the metal coating reflecting plate 3 is obliquely arranged. The 3.39 μm infrared light transmitted by the two-channel special optical fiber A5 is transmitted to the convex spherical mirror 2, passes through the fixed space optical path after being focused, and irradiates on the inclined metal coating reflection plate 3, the infrared light is reflected by the inclined metal coating reflection plate 3, passes through the fixed space optical path for the second time, is collected by the light-collecting shade 4, and is transmitted to the detector by the two-channel special optical fiber B6.
The two-channel special optical fiber A5 transmits and emits infrared light of 3.39 mu m to the convex spherical mirror 2.
A sapphire window is arranged in front of the convex spherical lens 2 and the light-gathering cover 4 in the shell 1. The gas to be measured is completely isolated from the circuit part of the sensor through the sapphire window, so that the monitoring precision and reliability of the detector are greatly improved.
The housing 1 is made of an insulating material.
The shell 1 is provided with a gas inlet through hole, and combustible gas in the environment enters the sensor through the through hole to be detected.
The utility model discloses an application principle does: the 3.39 mu m infrared light transmitted by the two-channel special optical fiber circuit A is focused to the convex spherical mirror, passes through the fixed space optical path and irradiates on the metal coated reflector, the infrared radiation light is reflected again, passes through the fixed space optical path for the second time and is collected by the light-collecting cover, the energy of the 3.39 mu m infrared radiation light absorbed by the combustible gas twice is transmitted to the detector by the two-channel special optical fiber circuit B, the energy after absorption and attenuation is detected as I, and I (lambda) is I0(λ) exp (. mu.CL) of which I0Is the initial energy of the infrared radiation; μ is the absorption coefficient of the gas in unit concentration; c is the concentration of the gas to be detected, and L is the absorption length of the light path of the gas to be detected; i (λ) is the energy of the infrared radiation absorbed by the gas. Thereby obtaining the concentration of the combustible gas in the dangerous explosion place.
The utility model adopts a reflection type light path structure, and the reflectivity of the metal coating reflection plate to the infrared band of 3-4.5 μm is not less than 95%. The optical path system is simple in structure, the gas to be detected is completely isolated from the circuit part of the sensor through the window, and the monitoring precision and reliability of the detector are greatly improved by the non-electric design structure.
The above description is only exemplary of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be considered within the scope of the present invention.
Claims (5)
1. The utility model provides a sensor of combustible gas detection alarm for explosion hazard place, includes the shell, its characterized in that: be equipped with protruding ball mirror, metal coating reflector panel, snoot in the shell, protruding ball mirror and the special optic fibre first way of two passageways are connected, the snoot is connected with the special optic fibre second way of two passageways, the special optic fibre first way of two passageways and the special optic fibre second way of two passageways send from the outer binary channels detector of shell and pass the shell again and get into in the shell.
2. The sensor for a flammable gas detection alarm for an explosion hazard location according to claim 1, wherein: the metal coating reflecting plate, the convex spherical lens and the light-gathering cover are arranged oppositely, and the metal coating reflecting plate is obliquely arranged.
3. The sensor for a flammable gas detection alarm for an explosion hazard location according to claim 1, wherein: the two-channel special optical fiber is transmitted by a first path and emits infrared light of 3.39 mu m to the convex spherical mirror.
4. The sensor for a flammable gas detection alarm for an explosion hazard location according to claim 1, wherein: a sapphire window is arranged in front of the convex spherical lens and the light-gathering cover in the shell.
5. The sensor for a flammable gas detection alarm for an explosion hazard location according to claim 1, wherein: the housing is constructed of an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021513243.2U CN212808047U (en) | 2020-07-27 | 2020-07-27 | Sensor of combustible gas detection alarm for explosion dangerous place |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021513243.2U CN212808047U (en) | 2020-07-27 | 2020-07-27 | Sensor of combustible gas detection alarm for explosion dangerous place |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212808047U true CN212808047U (en) | 2021-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021513243.2U Active CN212808047U (en) | 2020-07-27 | 2020-07-27 | Sensor of combustible gas detection alarm for explosion dangerous place |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212808047U (en) |
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2020
- 2020-07-27 CN CN202021513243.2U patent/CN212808047U/en active Active
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