CN215415003U - Gas chamber of spectrum absorption gas concentration sensor - Google Patents

Abstract

The utility model provides a spectrum absorption gas concentration sensor air chamber, the air chamber sets up in the shell of sensor, can hold gaseous entering to make light pass the gas in the air chamber, including massive air chamber main part, be provided with the reaction chamber in the air chamber main part, the reaction chamber includes launching section, reaction section and receiving section, the segmentation department is provided with the lens groove between launching section, reaction section and the receiving section, be provided with the reflection lens in the lens groove, the angle between the plane of reflection lens is 90 degrees. The reflection lens of air chamber sets up in the lens groove, and the components of a whole that can function independently design of reflection lens and air chamber main part makes the yields of air chamber increases substantially, and manufacturing cost reduces, and makes things convenient for the later maintenance to change, and the maintenance cost is lower.

Description

Gas chamber of spectrum absorption gas concentration sensor

Technical Field

The utility model relates to the field of mine monitoring equipment, in particular to a gas chamber of a spectral absorption gas concentration sensor.

Background

With the acceleration of industrial process in the world, the demand for various minerals is increasing, and flammable, explosive, toxic or harmful gas often escapes in the mining process. During mining, the concentration of these gases needs to be monitored.

In consideration of the characteristics of flammability and explosiveness of some gases, a passive optical fiber sensor based on spectrum absorption is invented by combining the current optical fiber technology, the sensor is provided with an air chamber cavity filled with the gas to be detected, light rays pass through the gas in the air chamber cavity, and different gases can absorb spectra with different wavelengths, so that the concentration and the type of the gas to be detected are obtained. Theoretically, the longer the distance a light ray travels in a gas, the higher the accuracy of detection. The gas sensor is divided into a transmission type gas sensor and a reflection type gas sensor, light of the transmission type gas sensor directly passes through a cavity filled with a measured gas in a straight line mode in the sensor, the space utilization rate is low, the size is large, the light of the reflection type gas sensor is emitted out after being reflected for multiple times in the cavity filled with the measured gas, the distance of the light passing through the gas is lengthened, and the size is small.

However, at present, the gas chamber in the transmission type gas sensor is mostly made by cutting a whole piece of glass, for example, a diffusion type spectrum absorption methane probe with explosion-proof performance is mentioned in patent CN202010731368.0, and the gas chamber in the sensor is made by cutting a whole piece of glass. This type of gas sensor requires very high to the machining precision of air chamber, and this air chamber yields that just leads to a monoblock glass cutting to make is very low, and manufacturing cost is higher, and because the air chamber uses monoblock glass to make, relatively fragile, shock-resistant, need change whole air chamber after the damage, and maintenance cost is also higher.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the present invention provides a gas cell of a spectral absorption gas concentration sensor, which is a reflective gas cell. This air chamber is only provided with the speculum piece of glass preparation in original light reflection's position, and it is relatively easy only to process the speculum piece, and the yields is higher, and manufacturing cost is lower, and this speculum piece is small, is difficult to damage, and the speculum piece can be followed the air chamber and pulled down the change, and the later maintenance cost is also lower.

The technical scheme of the utility model is as follows:

the utility model provides a gaseous concentration sensor air chamber of spectrum absorption, the air chamber sets up in the shell of sensor, can hold gaseous entering to make light pass the gas in the air chamber, gaseous concentration sensor air chamber of spectrum absorption includes massive air chamber main part, be provided with the reaction chamber in the air chamber main part, the reaction chamber includes launching section, reaction section and receiving section, the segmentation department is provided with the lens groove between launching section, reaction section and the receiving section, be provided with the reflection lens in the lens groove, light is followed the launching section and is got into after the reflection lens reflection, finally can follow the receiving section and jet out. The reflection lens of air chamber sets up in the lens groove, and the components of a whole that can function independently design of reflection lens and air chamber main part makes the yields of air chamber increases substantially, and manufacturing cost reduces, and makes things convenient for the later maintenance to change, and the maintenance cost is lower.

A gas cell for a spectral absorption gas concentration sensor as described above, said lens grooves having a cross-sectional shape comprising a triangle, said lens grooves comprising blind grooves.

Furthermore, vertex angle grooves are arranged at the corners of the lens grooves, and the depth of the vertex angle grooves is the same as that of the lens grooves.

Further, the cross-sectional shape of the apex groove comprises a circle. The reflecting lens is placed in the lens groove, fixing glue is injected into the vertex angle groove for fixing, and if the fixing glue is smeared on the back surface of the reflecting lens, the mirror surface angle of the reflecting lens after curing is prone to being inaccurate.

According to the gas chamber of the spectrum absorption gas concentration sensor, the reaction cavity is U-shaped, and the top ends of the transmitting section and the receiving end of the reaction cavity are provided with the transmitting head and the receiving head. The transmitting head and the receiving head are respectively connected with an external transmitting optical fiber and an external receiving optical fiber, the transmitting head is used for transmitting light rays to the gas in the reaction cavity, and the receiving head is used for receiving the light rays passing through the gas in the reaction cavity.

Furthermore, a through air inlet hole is arranged below the reaction section of the reaction cavity. The gas to be detected enters the reaction cavity through the air inlet.

In the gas cell for a spectral absorption gas concentration sensor, the reflecting mirror is a high-precision optical reflecting prism, and the cross section of the reflecting mirror comprises an isosceles triangle.

Furthermore, the reflector is made of fine annealed optical glass, the reflecting surface of the reflector is made of an aluminizing and polishing process, the emissivity is high, the stability is good, and the reflecting surface of the reflector can deflect incident light by 90 degrees.

Compared with the prior art, the utility model has the advantages that:

according to the gas chamber of the spectrum absorption gas concentration sensor, the gas chamber is provided with the gas chamber main body and the reflector, so that the reflector and the gas chamber main body can be conveniently processed, the manufacturing cost is reduced, the reflector can be conveniently detached, replaced and maintained in the future, and the maintenance cost is reduced. Set up the apex angle groove on the angle in lens groove, pour into the fixed glue fixed mirror piece into in the apex angle groove, can avoid the fixed glue to paint and lead to the mirror surface angle of reflector piece inaccurate after the solidification easily at the reflector piece back.

Drawings

The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model.

In the drawings:

FIG. 1 is a schematic view showing the structure of a gas cell of a spectral absorption gas concentration sensor according to example 1;

FIG. 2 is a front view of a gas chamber in example 1;

FIG. 3 is a schematic view showing the structure of the main body of the gas chamber in example 1;

FIG. 4 is a front view of a main body of a gas chamber in example 1;

FIG. 5 is a schematic view of the structure of a mirror plate in example 1;

the components represented by the reference numerals in the figures are:

1. the gas chamber comprises a gas chamber main body, 2, a reaction cavity, 21, an emission section, 22, a reaction section, 23, a receiving section, 3, a lens groove, 31, a vertex angle groove, 4, a reflection lens, 41, a reflection surface, 5, a gas inlet hole, 6, an emission head, 61, an emission optical fiber, 7, a receiving head, 71 and a receiving optical fiber.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.

The directions "front and back", "left and right", etc. mentioned in the present invention are only used to express the relative positional relationship, and are not restricted by any specific directional references in practical application.

Example 1

Referring to fig. 1 and 2, a gas cell of a spectral absorption gas concentration sensor, which is disposed in a housing of the sensor and can accommodate gas to enter and allow light to pass through the gas in the gas cell, includes a block-shaped gas cell body 1, and is made by cutting various cavities in the gas cell body 1, in this embodiment, the gas cell body 1 is rectangular, a reaction cavity 2 is disposed on the gas cell body 1, the reaction cavity 2 includes an emitting section 21, a reaction section 22 and a receiving section 23, a lens groove 3 is disposed at a section between the emitting section 21, the reaction section 22 and the receiving section 23, a reflective lens 4 is disposed in the lens groove 3, and light entering from the emitting section 21 is reflected by the reflective lens 4 and can finally exit from the receiving section 23. The reflector 4 of the air chamber is arranged in the lens groove 3, and the reflector 4 and the air chamber main body 1 are designed in a split mode, so that the yield of the air chamber is greatly improved, the manufacturing cost is reduced, later maintenance and replacement are facilitated, and the maintenance cost is lower.

Referring to fig. 2 and 3, the cross-sectional shape of the lens groove 3 in this embodiment is a triangle, and the lens groove 3 in this embodiment is a blind groove.

Further, vertex angle grooves 31 are arranged on the corners of the lens grooves 3, and the depth of the vertex angle grooves 31 is the same as that of the lens grooves 3.

Further, the sectional shape of the vertex angle groove 31 of the present embodiment is circular. The reflecting mirror 4 is placed in the mirror groove 3, fixing glue is injected into the vertex angle groove 31 for fixing, and if the fixing glue is coated on the back surface of the reflecting mirror 4, the mirror surface angle of the reflecting mirror 4 after curing is easily inaccurate.

Referring to fig. 3, the reaction chamber 2 of the present embodiment is U-shaped, and the emitting tip 6 and the receiving tip 7 are disposed at the top of the emitting section 21 and the receiving end of the reaction chamber 2. The emitting head 6 and the receiving head 7 are respectively connected with an emitting optical fiber 61 and a receiving optical fiber 71 outside, the emitting head 6 is used for emitting light rays to the gas in the reaction cavity 2, and the receiving head 7 is used for receiving the light rays passing through the gas in the reaction cavity 2.

Preferably, the emission head 6 reflects near infrared rays, and a combustible gas (e.g., methane) has a relatively strong ability to absorb light of a wavelength of the near infrared rays, so that the near infrared rays are used as a light source.

Further, the emitting head 6 has a light collimation function, and can change light diffused in the optical fiber into focused and collimated light.

Furthermore, a through air inlet 5 is arranged below the reaction section 22 of the reaction chamber 2. The gas to be detected enters the reaction cavity 2 through the air inlet hole 5.

Referring to fig. 5, the reflection lens 4 is a high-precision optical reflection prism, and the cross section of the reflection lens is in the shape of an isosceles triangle.

Furthermore, the reflector 4 is made of fine annealed optical glass, the reflecting surface 41 of the reflector 4 is made of an aluminizing and polishing process, the emissivity is high, the stability is good, particularly, the reflectivity to near infrared is high, and the reflecting surface 41 of the reflector 4 can deflect incident light by 90 degrees.

The gas cell of the spectral absorption gas concentration sensor has the following specific principle:

1) the gas to be detected enters the reaction cavity 2 through the air inlet 5;

1) the spectrometer emits near infrared light into the emission fiber 61;

2) near infrared light in the emitting optical fiber 61 is emitted into the emitting section 21 in the reaction cavity 2 after being collimated by the emitting head 6;

3) near infrared light passes through a gas to be detected in the emission section 21 and irradiates on a reflector 4 arranged between the emission section 21 and the reaction section 22, and a reflection surface 41 of the reflector 4 reflects and deflects the light rays by 90 degrees and then emits the light rays into the reaction section 22;

4) after passing through the gas in the reaction section 22, the light irradiates on the reflector 4 arranged between the reaction section 22 and the receiving section 23, and the reflecting surface 41 of the reflector 4 reflects and deflects the light by 90 degrees and then emits the light into the receiving section 23;

5) the light rays pass through the gas in the receiving section 23 and then irradiate the receiving head 7, the receiving head 7 receives the near infrared light passing through the gas in the reaction cavity 2 and transmits the near infrared light to the receiving optical fiber 71, and the receiving optical fiber 71 transmits the near infrared light to a spectrum analyzer for analysis.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or additions or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (8)

1. The utility model provides a gaseous concentration sensor air chamber of spectral absorption, the air chamber sets up in the shell of sensor, can hold gaseous entering to make light pass the gas in the air chamber, its characterized in that, including massive air chamber main part, be provided with the reaction chamber in the air chamber main part, the reaction chamber includes launching section, reaction section and receiving segment, segmentation department is provided with the lens groove between launching section, reaction section and the receiving segment, be provided with the reflection lens in the lens groove, light is followed the launching section and is got into after the reflection lens reflection, finally can follow the receiving segment and jet out.

2. The gas cell of claim 1, wherein the cross-sectional shape of the lens groove comprises a triangle and the lens groove comprises a blind groove.

3. The gas cell for a spectroscopic absorption gas concentration sensor according to claim 2 wherein the corners of the lens grooves are provided with vertex angle grooves, and the depth of the vertex angle grooves is the same as the depth of the lens grooves.

4. A spectroscopic absorption gas concentration sensor gas cell according to claim 3 wherein the cross-sectional shape of said apex slots comprises a circle.

5. The gas cell of a spectroscopic absorption gas concentration sensor according to claim 1 wherein the reaction chamber comprises a U-shape, and the top of the emitting section and the receiving section of the reaction chamber are provided with an emitting head and a receiving head.

6. The gas cell of claim 5, wherein a gas inlet hole is formed through the reaction chamber below the reaction section.

7. The gas cell of claim 1, wherein said mirror is a high-precision optical reflective prism, and the cross-sectional shape of said mirror comprises an isosceles triangle.

8. The gas cell of claim 7, wherein said mirror is made of a fine annealed optical glass, and a reflective surface of said mirror is made by an aluminizing and polishing process.

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