Gas detection device based on NDIR

Abstract

The utility model relates to the technical field of gas detection, and particularly discloses a gas detection device based on NDIR (Non-Dispersive Infra-Red), comprising a detection mechanism which comprises a bottom frame, a single-channel PbSe detector, spectral measurement equipment, an infrared multiple-reflection long-optical-path gas chamber and a nano infrared light source, the infrared multi-reflection long-optical-path air chamber comprises a first detection end and a second detection end, the temperature adjusting mechanism comprises an open groove formed in the upper surface of the bottom frame, the open groove penetrates through the bottom frame, a heating source is fixedly installed on the lower surface of the bottom frame, and a plurality of heating rods are arranged in the open groove; according to the device, the corresponding concentrations of various gas components can be measured by utilizing specific spectrum fingerprints of each gas on an infrared band, and damage of factors such as carbon deposition and corrosion to a detector can be avoided by applying a non-contact detection mode of a spectroscopy principle, so that the service life of detection equipment is prolonged, and the detection efficiency is improved. The device also can preheat the gas, so that the accuracy of gas concentration detection is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas detection, and particularly relates to a gas detection device based on NDIR. Background Technique

[0002] With the development of infrared light sources, sensors and electronic technologies, NDIR, as a fast and accurate gas analysis technology, has been widely used in gas concentration detection. For carbon dioxide detection, the NDIR detection method is recognized as the most effective analysis means. By adopting a new type of infrared sensor and an electrically modulated light source, and using a low-power embedded system circuit, the sensor has advantages in volume, power consumption, performance and price that cannot be compared with detection principles such as electrochemistry and semiconductors.

[0003] When detecting the gas concentration based on the NDIR principle, there are certain requirements for the temperature of the gas. The gas needs to reach a certain temperature, otherwise measurement errors will occur and the measurement results will not be accurate enough.

[0004] Therefore, those skilled in the art have proposed a gas detection device based on NDIR to solve the problems raised in the background technique.

[0005] The above information disclosed in this background technique is only used to increase the understanding of the background technique of the utility model. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Content of the Utility Model

[0006] The purpose of the utility model is to provide a gas detection device based on NDIR to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A gas detection device based on NDIR, comprising:

[0009] A detection mechanism, the detection mechanism includes a chassis, a single-channel PbSe detector, a spectral measurement device, an infrared multi-reflection long optical path gas chamber and a nano-infrared light source. The infrared multi-reflection long optical path gas chamber and the nano-infrared light source are both arranged on the chassis, and the infrared multi-reflection long optical path gas chamber is provided with a first detection end and a second detection end;

[0010] A temperature control mechanism, the temperature control mechanism includes a slot opened on the upper surface of the chassis, the slot penetrates the chassis, a heating source is fixedly installed on the lower surface of the chassis, a plurality of heating rods are arranged inside the slot, the heating rods are electrically connected to the heating source, and the heating rods are in contact with the lower surface of the infrared multi-reflection long optical path gas chamber.

[0011] Preferably, a light incident window is provided on one surface of the first detection end, a light output window is provided on the second detection end, the position of the nano-infrared light source is adapted to the light incident window, and the position of the single-channel PbSe detector is adapted to the light output window.

[0012] Preferably, a first mounting bracket and a second mounting bracket are respectively and fixedly provided on the upper surfaces at both ends of the chassis. The nano-infrared light source is arranged on the first mounting bracket, and the single-channel PbSe detector is arranged on the second mounting bracket.

[0013] Preferably, a notch is formed in the first mounting bracket, a movable shaft is inserted into the notch, the movable shaft is connected to the nano-infrared light source, and the nano-infrared light source is rotationally matched with the notch through the movable shaft.

[0014] Preferably, an air inlet and an air outlet are respectively provided on the upper surfaces at both ends of the infrared multi-reflection long optical path gas chamber. Both the air inlet and the air outlet are communicated with the inside of the infrared multi-reflection long optical path gas chamber.

[0015] Preferably, the single-channel PbSe detector is connected to a spectral measurement device, the spectral measurement device is electrically connected to a host computer, and the spectral measurement device includes a sampling signal amplification module and a gas concentration detection module.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] (1) By setting a single-channel PbSe detector, a spectral measurement device, an infrared multi-reflection long optical path gas chamber and a nano-infrared light source, the present utility model places the nano-infrared light source at the light incident window, installs the single-channel PbSe detector at the light output window, and connects the single-channel PbSe detector to the spectral measurement device. When detection is required, the gas to be detected can be introduced into the infrared multi-reflection long optical path gas chamber through the air inlet. At the same time, the heating source on the chassis is started to heat the gas in the infrared multi-reflection long optical path gas chamber through a heating rod. The heating temperature and heating time are set. When the predetermined temperature condition is reached, the nano-infrared light source can emit infrared light. After passing through the gas, the infrared light will be projected onto the single-channel PbSe detector. Then, the spectral measurement device amplifies and detects the spectral signal, and finally the detected result is displayed on the host computer. This device can measure the corresponding concentrations of multiple gas components by using the specific spectral fingerprints of each gas in the infrared band, has practicability, cross-field property and popularization property, and the non-contact detection method using the principle of spectroscopy can avoid the damage to the detector caused by factors such as carbon deposition and corrosion, thereby prolonging the service life of the detection equipment. This device can also perform pre-heating treatment on the gas to improve the accuracy of gas concentration detection.

[0018] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a left - view three - dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 It is a right - view three - dimensional structural schematic diagram of the present utility model;

[0021] Figure 3 It is a front view of the present utility model;

[0022] Figure 4 It is a bottom - view three - dimensional structural schematic diagram of the present utility model.

[0023] In the figure: 1, nano - infrared light source; 2, infrared multi - reflection long optical path gas chamber; 3, single - channel PbSe detector; 4, spectral measurement device; 5, upper computer; 6, chassis; 7, air inlet; 8, air outlet; 9, first detection end; 10, second detection end; 11, light - entering window; 12, light - exiting window; 13, first mounting bracket; 14, second mounting bracket; 15, notch; 16, movable shaft; 17, heating rod; 18, heat source; 19, slotting. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] Embodiment 1:

[0026] Please refer to Figures 1-4 As shown, a gas detection device based on NDIR includes:

[0027] A detection mechanism, the detection mechanism includes a chassis 6, a single - channel PbSe detector 3, a spectral measurement device 4, an infrared multi - reflection long optical path gas chamber 2, and a nano - infrared light source 1. The infrared multi - reflection long optical path gas chamber 2 and the nano - infrared light source 1 are both arranged on the chassis 6. The infrared multi - reflection long optical path gas chamber 2 is provided with a first detection end 9 and a second detection end 10;

[0028] Temperature adjustment mechanism, the temperature adjustment mechanism includes a slot 19 opened on the upper surface of the chassis 6, the slot 19 penetrates through the chassis 6, a heating source 18 is fixedly installed on the lower surface of the chassis 6, several heating rods 17 are arranged inside the slot 19, the heating rods 17 are electrically connected to the heating source 18, and the heating rods 17 are in contact with the lower surface of the infrared multi-reflection long optical path gas chamber 2.

[0029] Specifically, a light incident window 11 is arranged on one surface of the first detection end 9, a light exit window 12 is arranged on the second detection end 10, the position of the nano-infrared light source 1 is adapted to the light incident window 11, and the position of the single-channel PbSe detector 3 is adapted to the light exit window 12.

[0030] Specifically, a first mounting bracket 13 and a second mounting bracket 14 are respectively and fixedly arranged on the upper surfaces at both ends of the chassis 6, the nano-infrared light source 1 is arranged on the first mounting bracket 13, and the single-channel PbSe detector 3 is arranged on the second mounting bracket 14.

[0031] Specifically, a notch 15 is opened on the first mounting bracket 13, a movable shaft 16 is inserted into the notch 15, the movable shaft 16 is connected to the nano-infrared light source 1, and the nano-infrared light source 1 is rotationally matched with the notch 15 through the movable shaft 16.

[0032] Specifically, an air inlet 7 and an air outlet 8 are respectively arranged on the upper surfaces at both ends of the infrared multi-reflection long optical path gas chamber 2, and both the air inlet 7 and the air outlet 8 are communicated with the inside of the infrared multi-reflection long optical path gas chamber 2.

[0033] Specifically, the single-channel PbSe detector 3 is connected to the spectral measurement device 4, the spectral measurement device 4 is electrically connected to the upper computer 5, and the spectral measurement device 4 includes a sampling signal amplification module and a gas concentration detection module.

[0034] As can be seen from the above, this device is provided with a single-channel PbSe detector 3, a spectral measurement device 4, an infrared multi-reflection long optical path gas cell 2, and a nano-infrared light source 1. The nano-infrared light source 1 is placed at the light inlet window 11, the single-channel PbSe detector 3 is installed at the light outlet window 12, and the single-channel PbSe detector 3 is connected to the spectral measurement device 4. When detection is required, the gas to be detected can be introduced into the infrared multi-reflection long optical path gas cell 2 through the air inlet 7. At the same time, the heating source 18 on the chassis 6 is started to heat the gas in the infrared multi-reflection long optical path gas cell 2 through the heating rod 17. The heating temperature and heating time are set. After reaching the predetermined temperature condition, infrared light can be emitted through the nano-infrared light source 1. After passing through the gas, the infrared light will be projected onto the single-channel PbSe detector 3. Then, the spectral measurement device 4 amplifies and detects the spectral signal, and finally the detected result is displayed on the host computer 5. This device can measure the corresponding concentrations of multiple gas components by using the specific spectral fingerprints of each gas in the infrared band, and has practicability, cross-field property, and popularizability. Moreover, the non-contact detection method using the principle of spectroscopy can avoid the damage to the detector caused by factors such as carbon deposition and corrosion, thereby prolonging the service life of the detection equipment. This device can also perform pre-heating treatment on the gas to improve the accuracy of gas concentration detection.

[0035] The standard parts used in this utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0036] In the description of this utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0037] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0039] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] In the drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments are involved, and other structures may refer to the general design. Without conflict, the same embodiment and different embodiments of the present utility model may be combined with each other.

[0041] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A gas detection device based on NDIR, characterized in that: include: A detection mechanism, the detection mechanism comprising a base frame (6), a single-channel PbSe detector (3), a spectrum measurement device (4), an infrared multiple reflection long optical path air chamber (2) and a nanometer infrared light source (1), the infrared multiple reflection long optical path air chamber (2) and the nanometer infrared light source (1) are both arranged on the base frame (6), and the infrared multiple reflection long optical path air chamber (2) comprises a first detection end (9) and a second detection end (10); A temperature control mechanism, the temperature control mechanism comprising a slot (19) provided on the upper surface of a base frame (6), the slot (19) penetrating the base frame (6), a heating source (18) being fixedly mounted on the lower surface of the base frame (6), a plurality of heating rods (17) being arranged inside the slot (19), the heating rods (17) being electrically connected to the heating source (18), and the heating rods (17) being in contact with the lower surface of an infrared multiple reflection long optical path air chamber (2).

2. The NDIR-based gas detection device according to claim 1, characterized in that: A light entrance window (11) is provided on a surface of the first detection end (9), a light exit window (12) is provided on the second detection end (10), the position of the nano-infrared light source (1) is adapted to the light entrance window (11), and the position of the single-channel PbSe detector (3) is adapted to the light exit window (12).

3. The NDIR-based gas detection device according to claim 1, characterized in that: A first mounting frame (13) and a second mounting frame (14) are respectively fixedly arranged on the upper surfaces at both ends of the base frame (6); the nano-infrared light source (1) is arranged on the first mounting frame (13); and the single-channel PbSe detector (3) is arranged on the second mounting frame (14).

4. The NDIR-based gas detection device according to claim 3, characterized in that: The first mounting frame (13) is provided with a notch (15), a movable shaft (16) is inserted into the notch (15), the movable shaft (16) is connected to the nanometer infrared light source (1), and the nanometer infrared light source (1) is rotatably matched with the notch (15) via the movable shaft (16).

5. The NDIR-based gas detection device according to claim 1, characterized in that: An air inlet (7) and an air outlet (8) are respectively arranged on the upper surfaces at both ends of the infrared multiple reflection long optical path air chamber (2), and the air inlet (7) and the air outlet (8) are both connected to the interior of the infrared multiple reflection long optical path air chamber (2).

6. The NDIR-based gas detection device according to claim 1, characterized in that: The single-channel PbSe detector (3) is connected to a spectrum measurement device (4), the spectrum measurement device (4) is electrically connected to a host computer (5), and the spectrum measurement device (4) includes a sampling signal amplification module and a gas concentration detection module.

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