CN211877745U

CN211877745U - Gas sensor

Info

Publication number: CN211877745U
Application number: CN202020484432.5U
Authority: CN
Inventors: 林永贤; 王昕�; 张�杰; 马启龙
Original assignee: Shanghai Aegis Industrial Safety Corp
Current assignee: Shanghai Aegis Industrial Safety Corp
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-11-06
Anticipated expiration: 2030-04-03

Abstract

The embodiment of the utility model discloses gas sensor. The gas sensor includes: the at least two light channels are arranged in a stacked mode and are consistent in size and shape; the inner wall of the light channel is coated with a reflecting layer; the optical channel is provided with a vent hole for introducing gas; the optical channel comprises a first port and a second port; at least one detection light source disposed at the first port of the optical channel; at least one light sensor disposed at the second port of the light channel. The embodiment of the utility model provides a solved current gas sensor probe and received the size restriction can not realize higher measurement accuracy problem, can reduce the accidental error that produces in the gas absorption process to a certain extent, improved gas sensor to gas absorption's measurement accuracy to make gas sensor compromise small volume and high measurement accuracy's requirement.

Description

Gas sensor

Technical Field

The embodiment of the utility model provides a relate to gaseous detection technical field, especially relate to a gas sensor.

Background

In recent years, photoelectric measuring instruments for measuring gas components and concentrations by using the principle of spectral absorption are developing towards high sensitivity, full range, small volume and low cost to meet the increasing requirements of environmental safety detection and production safety monitoring.

In practical engineering applications, the light absorption type gas sensor needs to minimize not only measurement errors to ensure high measurement accuracy of gas but also the volume of the gas sensor. In the spectrum absorption type gas sensor probe, one of the structures with the largest volume is a gas chamber or a gas absorption cell of the gas sensor, the gas chamber of the gas sensor is formed by a space between a light source and a light sensor, because the length of a measuring optical path of a light beam in the gas chamber is in direct proportion to the measuring precision, the high-precision gas sensor needs a longer measuring optical path, and the longer measuring optical path can lead the side length of the gas chamber to increase the size of the sensor probe. The existing gas sensor probe is limited by the size, so that higher measurement accuracy cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas sensor to improve gaseous measurement accuracy, realize that small volume and high accuracy compromise.

An embodiment of the utility model provides a gas sensor, include:

the at least two light channels are arranged in a stacked mode and are consistent in size and shape; the inner wall of the light channel is coated with a reflecting layer; the optical channel is provided with a vent hole for introducing gas; the optical channel comprises a first port and a second port;

at least one detection light source disposed at the first port of the optical channel;

at least one light sensor disposed at the second port of the light channel.

Optionally, the at least two optical channels are isolated from each other, and the second port of each optical channel is provided with one optical sensor.

Optionally, the at least two optical channels include at least one detection optical channel and at least one reference optical channel, or both of the at least two optical channels are detection optical channels;

the gas to be detected is communicated in the detection light channel, and the reference gas is communicated in the reference light channel.

Optionally, the gas sensor comprises 2n +1 detection light channels, one detection light source and one light sensor, where n is an integer greater than or equal to 1;

two first ports or two second ports of two detection light channels positioned in adjacent layers are communicated through a light guide pipe; the detection light source is arranged at the first port of the 1 st optical channel, and the optical sensor is arranged at the second port of the 2n +1 th optical channel.

Optionally, the gas sensor comprises three detection light channels, one detection light source and one light sensor, wherein the three detection light channels comprise a first detection light channel, a second detection light channel and a third detection light channel which are sequentially stacked;

the detection light source is arranged at the first port of the first detection light channel, the second port of the first detection light channel is communicated with the second port of the second detection light channel, the first port of the second detection light channel is communicated with the first port of the third detection light channel, and the light sensor is arranged at the second port of the third detection light channel.

Optionally, the light channel is helical, and the first port is located at the center of the helix and the second port is located at the edge of the helix.

Optionally, the gas sensor comprises at least two channel cartridges, the at least two channel cartridges being stacked on top of each other;

the channel box comprises a channel plate and a cover plate, wherein the channel plate is provided with a guide groove, and the channel plate and the cover plate are mutually attached to enable the guide groove to form the light channel.

Optionally, the centers of the at least two channel boxes are hollowed out, and the detection light source is located at the hollowed-out center of the at least two channel boxes and penetrates through the at least two channel boxes.

Optionally, the vent hole is disposed on a side wall of the guide groove, or the vent hole is disposed on the cover plate.

Optionally, the light source is a laser light source or a diffuse light source.

The embodiment of the utility model provides a gas sensor, through setting up range upon range of and two at least optical channels that size shape is unanimous, and optical channel's inner wall coating reflector layer, and set up the air vent on optical channel, in order to let in the gas that awaits measuring, then set up at least one detection light source at two at least optical channel's first port, set up at least one light sensor at two at least optical channel's second port, can utilize a plurality of optical channel's optical path length, or a plurality of optical channel's gaseous absorption measurement sampling, perhaps refer to optical channel's reference absorption measurement sampling, reduce the accidental error that produces in the gaseous absorption process to a certain extent, thereby improve gas sensor to the measuring accuracy of gaseous absorption, thereby make gas sensor compromise the requirement of small volume and high measuring accuracy.

Drawings

Fig. 1 is a schematic structural diagram of a gas sensor according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view AA' of the gas sensor shown in FIG. 1

FIG. 3 is a schematic cross-sectional view along BB' of the gas sensor shown in FIG. 1;

fig. 4 is a schematic cross-sectional view of another gas sensor provided in an embodiment of the present invention;

FIG. 5 is an exploded schematic view of the gas sensor of FIG. 1;

fig. 6 is a schematic cross-sectional view of another gas sensor provided in an embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of another gas sensor provided in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another gas sensor provided in the embodiment of the present invention;

fig. 9 is a schematic cross-sectional view of the gas sensor shown in fig. 8.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As described in the background section, the gas cell in the existing gas sensor has a relatively simple structure, and is generally a single straight channel or a curved channel, or a reflection unit is added therein to increase the measurement optical path between the light source and the light sensor, thereby improving the measurement accuracy of the gas sensor. However, due to the limitation of the overall size, the optical length of the measurement increased by the structure of the single straight channel or the bent channel is limited, and the improvement of the measurement accuracy of the gas sensor is also limited.

Based on the problem, the embodiment of the utility model provides a gas sensor. The gas sensor comprises at least two light channels which are arranged in a stacked mode and are consistent in size and shape; the inner wall of the light channel is coated with a reflecting layer; the optical channel is provided with a vent hole for introducing gas; the optical channel includes a first port and a second port; at least one detection light source arranged at the first port of the light channel; and the at least one light sensor is arranged at the second port of the light channel.

The optical channel is a channel for guiding light, and the inner wall of the optical channel is coated with a reflective layer, so that light can be reflected for multiple times until the light is led out from the port. The reflective layer is generally a metal reflective layer formed by a plating process, such as a metal film layer of gold, silver, aluminum, etc., wherein the gold reflective layer has a relatively good light reflectivity. The first port and the second port of the optical channel are respectively provided with a detection light source and an optical sensor, gas to be detected is introduced into the optical channel through the vent hole, and light emitted by the detection light source is transmitted in the optical channel until the light is received by the optical sensor. The light source may be a laser light source or a diffuse light source, which is not limited herein. The light of partial wave band can be absorbed by the gas to be measured in the optical channel in the process of transmission, so that the spectrum actually received by the optical sensor is different from the spectrum of the detection light source, and especially the light intensity of the wave band absorbed by the gas to be measured can be reduced or even disappear. The optical sensor in the gas sensor can provide the collected spectral information to the optical processor, the spectral band absorbed by the gas to be measured in the optical channel can be determined according to the comparative analysis of the spectrum, and the information such as the composition, the content and the like of the gas can be analyzed and obtained according to the specific absorption band of the known gas composition, so that the measurement of the gas is realized. For example, for gases such as methane, alkane, carbon dioxide and the like, the gases have strong absorption capacity for corresponding wave bands in an infrared spectrum, so that the components and the contents of the gases such as methane, alkane, carbon dioxide and the like can be analyzed and determined by setting a detection light source as an infrared light source and utilizing the infrared spectrum collected by a light sensor. Of course, those skilled in the art can apply the gas sensor to other gas experiment scenarios, and is not limited herein.

It should be noted that the embodiment of the present invention provides a gas sensor, in which at least two optical channels are arranged in a stacked manner, and the size and shape are consistent, and a plurality of optical channels can be used for gas absorption measurement, so as to obtain a plurality of gas absorption samples, and when a back-end processor processes the gas, the accidental error can be reduced and the measurement accuracy of gas absorption can be improved by average processing; one optical channel can be set as a reference optical channel to provide an actual reference spectrum after light of a detection light source passes through the optical channel, so that the influence of factors such as environmental gas on the actually measured spectrum is avoided, environmental errors are reduced, and the measurement precision of gas absorption is improved; of course, a plurality of optical channels can be communicated, so that the expansion of the optical channels is realized, the optical path of light is increased, the light absorption rate of the gas to be measured is improved, and the measurement precision of gas absorption is further improved. In addition, because two at least light channels are range upon range of settings, effectively utilized the ascending size of light sensor, compared in current gas sensor, under the condition that equal space accounts for the ratio, the embodiment of the utility model provides a gas sensor has higher measurement accuracy, perhaps, under equal measurement accuracy, the utility model provides a gas sensor can realize littleer volume size.

Above is the core thought of the utility model, will combine the attached drawing in the embodiment of the utility model below, to the technical scheme in the embodiment of the utility model clearly, describe completely. Based on the embodiments in the present invention, under the premise that creative work is not done by ordinary skilled in the art, all other embodiments obtained all belong to the protection scope of the present invention.

The embodiment of the present invention provides a specific structure of a plurality of gas sensors. Fig. 1 is a schematic structural diagram of a gas sensor according to an embodiment of the present invention, fig. 2 is a schematic structural diagram of a cross section along AA 'of the gas sensor shown in fig. 1, fig. 3 is a schematic structural diagram of a cross section along BB' of the gas sensor shown in fig. 1, referring to fig. 1-3, first, the gas sensor includes at least two optical channels 10, which are illustrated as two optical channels 10, and the at least two optical channels 10 are stacked and have the same size and shape; the inner wall of the light channel 10 is coated with a light reflecting layer (not shown in the figure); the optical channel 10 is provided with a vent hole 103 for introducing gas; the optical channel 10 comprises a first port 101 and a second port 102; at least one detection light source 20, disposed at the first port 101 of the light channel 10; at least one light sensor 30 is arranged at the second port 102 of the light channel 10.

As in the gas sensor provided in the above figures, it is preferred that the optical channel 10 is helical, with the first port 101 being located at the centre of the helix and the second port 102 being located at the edge of the helix. The spiral optical channel structure can fully utilize the space of the optical channel in the plane, improve the utilization rate of the area in the plane, and ensure that the optical path of the optical channel in the two-dimensional space is elongated as much as possible, thereby being beneficial to improving the light absorption efficiency of gas and improving the accuracy of gas absorption measurement.

Fig. 4 is a schematic cross-sectional structure diagram of another gas sensor provided in an embodiment of the present invention, referring to fig. 4, optionally, in addition to fig. 2, the light channel in the gas sensor is set to be a circular spiral, and also may be set to be a polygonal spiral, and the number of sides of the polygonal spiral may be increased according to an actual light reflection effect.

Fig. 5 is an exploded schematic view of the gas sensor shown in fig. 1, and referring to fig. 5, in particular, the gas sensor includes at least two channel cartridges 100, the at least two channel cartridges 100 being stacked on each other; the channel box 100 includes a channel plate 110 and a cover plate 120, the channel plate 110 is provided with a guide slot 1101, and the channel plate 110 and the cover plate 120 are attached to each other such that the guide slot 1101 forms a light channel.

Further optionally, with reference to fig. 3, the centers of the at least two channel boxes 100 are all hollowed out, and the detection light source 20 is located at the hollowed-out center of the at least two channel boxes 100 and penetrates through the at least two channel boxes 100. At this moment, the gas sensor sets up the detection light source 20 to rectangular form to run through a plurality of laminated passageway boxes 100, provide unanimous light source light for a plurality of light channels, not only can reduce the quantity of detecting the light source through sharing one detection light source 20, convenient equipment can also avoid because the error that the light source difference caused influences. Of course, a person skilled in the art may also select a detection light source to be disposed corresponding to each light channel, which is not limited herein.

With continued reference to fig. 3 and 5, in the channel plate 110, the vent hole 103 may be provided on a side wall of the guide groove 1101, for example. Of course, a plurality of vent holes 103 may be provided, and the vent holes 103 may be provided at other positions. Fig. 6 is a schematic cross-sectional structure diagram of another gas sensor provided in an embodiment of the present invention, and referring to fig. 6, a vent 103 may be disposed on the cover plate 120.

In an embodiment of the present invention, as shown in fig. 1-3, optionally, at least two optical channels 10 are isolated from each other, and the second port 102 of each optical channel 10 is provided with one optical sensor 30. At this time, each optical channel 10 can perform the measurement of the light absorption, and the spectrum of the light transmitted in the optical channel 10 can be measured by the optical sensor 30 disposed at the second port 102. Therefore, the light absorption errors caused by accidental factors such as the concentration and the dispersion uniformity of the gas in each optical channel 10 can be averaged by the plurality of optical channels 10, so that the influence of the accidental errors can be reduced, and the measurement accuracy of the gas absorption can be effectively improved.

In the gas sensor as described above, in addition to the scheme that the gas to be measured is introduced into each optical channel to obtain samples of absorption spectra of a plurality of gases to be measured and to realize error averaging, one of the optical channels may be set as a reference optical channel. Fig. 7 is a schematic cross-sectional view of another gas sensor provided by an embodiment of the present invention, comparing fig. 3 and fig. 7, based on that one optical sensor 30 is disposed at the second port 102 of each optical channel 10 shown in fig. 7, further alternatively, the at least two optical channels 10 include at least one detection optical channel 11 and at least one reference optical channel 12.

Unlike the gas sensor shown in fig. 3, in the gas sensor shown in fig. 7, the reference light channel 12 located at the bottom layer is filled with the reference gas, and the other detection light channels 11 are filled with the gas to be measured. The reference gas is generally a gas such as air that does not have an absorption effect on the spectrum of the detection light source, or an impurity gas known to exist in the gas to be detected in the detection light channel 11. Since the optical sensor 30 is disposed at the second port 102 of each optical channel 10, the absorption spectrum of the reference gas can be measured to serve as the reference spectrum of the absorption spectrum of the gas to be measured, so that the influence of other non-gas to be measured can be reduced, and the misjudgment of the gas components can be avoided. It should be noted here that, for the analysis and processing of the spectrum to be performed by a back-end processor, the gas sensor of the embodiments of the present invention can provide a raw data basis.

The embodiment of the present invention further provides a structure of an optical sensor, wherein optionally, the gas sensor includes 2n +1 detection optical channels, a detection light source and an optical sensor, where n is an integer greater than or equal to 1; two first ports or two second ports of two detection light channels positioned on adjacent layers are communicated through a light guide pipe; the detection light source is arranged at the first port of the 1 st optical channel, and the optical sensor is arranged at the second port of the 2n +1 th optical channel.

The light pipe can be a connecting pipe with a reflective inner wall, and the inner wall can be reflected by utilizing a metal coating. The light in the detection light channel can be reflected by the light pipe, so that the light is guided into another detection light channel. Obviously, through the detection light channel intercommunication that will range upon range of setting, can make full use of vertical upper space, carry out the expansion of light channel absolute length with gas sensor, increase the optical path of detection light source light, further make gas can fully absorb the light of specific wave band in the detection light source spectrum, guarantee gas absorption efficiency, make clear and definite gas absorption spectrum, improve the gas absorption measuring precision.

Fig. 8 is a schematic structural diagram of another gas sensor provided in an embodiment of the present invention, and fig. 9 is a schematic sectional diagram of the gas sensor shown in fig. 8, and referring to fig. 8 and 9, the gas sensor exemplarily includes three detecting light channels 11, one detecting light source 20 and one light sensor 30, wherein the three detecting light channels 11 include a first detecting light channel 111, a second detecting light channel 112 and a third detecting light channel 113 which are sequentially stacked; the two first ports 101 or the two second ports 102 of the two detection light channels 11 located in adjacent layers are communicated through the light guide 104, the detection light source 20 is disposed at the first port 101 of the 1 st light channel 10, and the light sensor 30 is disposed at the second port 102 of the 3 rd light channel 10. Specifically, the detection light source 20 is disposed at the first port 101 of the first detection light channel 111, and the light sensor 30 is disposed at the second port 102 of the third detection light channel 113. It will be appreciated that the second port of the first detection light channel 111 communicates with the second port of the second detection light channel 112, and the first port of the second detection light channel 112 communicates with the first port of the third detection light channel 113. Obviously, three detection light channels are arranged, so that the measurement accuracy and the size of the gas sensor can be considered simultaneously, and the accuracy of gas absorption measurement is improved while the size is ensured to be smaller.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A gas sensor, comprising:

at least one light sensor disposed at the second port of the light channel.

2. The gas sensor according to claim 1, wherein the at least two optical channels are isolated from each other, and one optical sensor is disposed at the second port of each optical channel.

3. The gas sensor according to claim 2, wherein the at least two optical channels comprise at least one detection optical channel and at least one reference optical channel, or wherein the at least two optical channels are both detection optical channels;

4. The gas sensor according to claim 1, wherein the gas sensor comprises 2n +1 detection light channels, one detection light source, and one light sensor, where n is an integer greater than or equal to 1;

5. The gas sensor according to claim 4, wherein the gas sensor comprises three detection light channels, one detection light source, and one light sensor, the three detection light channels comprising a first detection light channel, a second detection light channel, and a third detection light channel, which are stacked in this order;

6. The gas sensor of claim 1, wherein the optical channel is helical, and the first port is located at a center of the helix and the second port is located at an edge of the helix.

7. The gas sensor according to claim 6, wherein the gas sensor comprises at least two channel cartridges, the at least two channel cartridges being stacked on each other;

8. The gas sensor according to claim 7, wherein the centers of the at least two channel boxes are hollowed out, and the detection light source is located at the hollow center of the at least two channel boxes and penetrates through the at least two channel boxes.

9. The gas sensor according to claim 7, wherein the vent hole is provided on a side wall of the guide groove, or the vent hole is provided on the cover plate.

10. The gas sensor according to claim 1, wherein the light source is a laser light source or a diffuse light source.