Novel carbon dioxide concentration sensor

Abstract

A novel carbon dioxide concentration sensor relates to the technical field of sensors and comprises a shell, a base, a PCB (printed circuit board), an inner cover, an infrared receiving probe and an NDIR light-emitting tube, the base is arranged at the lower end of the shell, the shell is clamped with the base, an air inlet is formed in the upper surface of the shell, an air outlet is formed in the side surface of the shell, the PCB is arranged above the base, the infrared receiving probe is arranged on the PCB, and the inner cover is arranged on the inner cover. The carbon dioxide detector comprises an inner cover, a PCB, an infrared receiving probe, a power converter, a single chip microcomputer and an operational amplifier, the inner cover is arranged above the PCB, an NDIR infrared light-emitting tube is arranged on the inner cover, the PCB, the inner cover, the infrared receiving probe and the NDIR infrared light-emitting tube are all arranged in a shell, and a carbon dioxide detection cavity is formed between the inner cover and the shell; according to the utility model, the practicability is strong, the use is very convenient, the single chip microcomputer on the PCB drives the NDIR infrared light emitting tube to emit light, the infrared light is reflected for multiple times on the light path of the surface mirror surface and the internal mirror surface, the infrared light is detected by the infrared control head after passing through the detection cavity, and temperature compensation and device attenuation compensation are carried out through a software algorithm, so that the detection precision is ensured not to be influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a novel carbon dioxide concentration sensor. Background Art

[0002] Carbon dioxide sensors are widely used in monitoring and are generally recognized by the market. They play an important role in smart homes, smart agriculture, animal husbandry, industrial gas emissions, automotive air-conditioning systems and other fields. Currently, carbon dioxide sensors on the market are generally greatly affected by external environmental conditions, and device attenuation results in inaccurate detection data and high equipment replacement costs. Therefore, we propose a new type of carbon dioxide concentration sensor. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model discloses a novel carbon dioxide concentration sensor. The utility model arranges a PCB board, an inner cover, an infrared receiving probe and an NDIR infrared light-emitting tube between the outer shell and the base to achieve the purpose of quickly and accurately detecting the carbon dioxide concentration.

[0004] In order to achieve the purpose of the utility model, the utility model adopts the following technical solutions:

[0005] A novel carbon dioxide concentration sensor includes a shell, a base, a PCB board, an inner cover, an infrared receiving probe and an NDIR infrared light-emitting tube. The base is provided at the lower end of the shell, and the shell and the base are snap-connected. A PCB board is provided above the base, and the PCB board is provided with an infrared receiving probe. The inner cover is provided above the PCB board, and the inner cover is provided with an NDIR infrared light-emitting tube. The PCB board, inner cover, infrared receiving probe and NDIR infrared light-emitting tube are all provided in the shell. A carbon dioxide detection cavity is provided between the shell and the inner cover. An air inlet is provided on the upper surface of the shell, and an air outlet is provided on the side of the shell. Both the air inlet and the air outlet are connected to the detection cavity.

[0006] The PCB board is electrically connected to the infrared receiving probe, and the upper end of the infrared receiving probe passes through the inner cover.

[0007] The PCB board is also provided with a power converter, a single chip microcomputer and an operational amplifier.

[0008] The NDIR infrared light emitting tube is arranged above the inner cover, the NDIR infrared light emitting tube is arranged on one side of the air inlet, and the NDIR infrared light emitting tube is electrically connected to the PCB board.

[0009] The upper surface of the inner cover is provided with a surface mirror.

[0010] The top surface of the inner wall of the shell is provided with an internal mirror light path, and the NDIR infrared light emitting tube, the surface mirror and the internal mirror light path are arranged in coordination.

[0011] The novel carbon dioxide concentration sensor described in the utility model is highly practical and very convenient to use. The NDIR infrared light-emitting tube is driven by the single-chip microcomputer on the PCB board to emit light. The infrared light is reflected multiple times on the surface mirror and the internal mirror light path. After passing through the detection cavity, it is detected by the infrared control head. Temperature compensation and device attenuation compensation are performed through the software algorithm to ensure that the detection accuracy is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the position structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the position structure of the utility model;

[0015] In the figure: 1. Outer shell; 2. Air inlet; 3. Air outlet; 4. Base; 5. PCB board; 6. Inner cover; 7. Surface mirror; 8. Infrared receiving probe; 9. LED light; 10. Detection cavity; 11. Internal mirror light path. DETAILED DESCRIPTION

[0016] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0017] Combined with attachment Figures 1-3 A novel carbon dioxide concentration sensor includes a shell 1, a base 4, a PCB board 5, an inner cover 6, an infrared receiving probe 8 and an NDIR infrared light-emitting tube 9. The base 4 is provided at the lower end of the shell 1, and the shell 1 is snap-connected to the base 4. A PCB board 5 is provided above the base 4, and an infrared receiving probe 8 is provided on the PCB board 5. The inner cover 6 is arranged above the PCB board 5, and an NDIR infrared light-emitting tube 9 is provided on the inner cover 6. The PCB board 5, the inner cover 6, the infrared receiving probe 8 and the NDIR infrared light-emitting tube 9 are all arranged in the shell 1. A carbon dioxide detection cavity 10 is provided between the shell 1 and the inner cover 6. An air inlet 2 is provided on the upper surface of the shell 1, and an air outlet 3 is provided on the side of the shell 1. The air inlet 2 and the air outlet 3 are both connected to the detection cavity 10.

[0018] The PCB board 5 is electrically connected to the infrared receiving probe 8 . The upper end of the infrared receiving probe 8 passes through the inner cover 6 . The infrared receiving probe 8 is used to detect the infrared rays emitted by the NDIR infrared light emitting tube 9 .

[0019] The PCB board 5 is also provided with a power converter, a single chip microcomputer and an operational amplifier.

[0020] The NDIR infrared light emitting tube 9 is arranged above the inner cover 6 , the NDIR infrared light emitting tube 9 is arranged on one side of the air inlet 2 , and the NDIR infrared light emitting tube 9 is electrically connected to the PCB board 5 .

[0021] The upper surface of the inner cover 6 is provided with a surface mirror 7 .

[0022] An internal mirror light path 11 is provided on the top surface of the inner wall of the shell 1. The NDIR infrared light-emitting tube 9, the surface mirror 7 and the internal mirror light path 11 are arranged in coordination. The light emitted by the light-emitting LED lamp 9 is reflected by the surface mirror 7 and the internal mirror light path 11, and is thereby detected by the infrared receiving probe 8. Carbon dioxide can absorb light of a specific wavelength, resulting in a weakening of the detected light intensity. At the same time, both the unabsorbed wavelengths and the absorbed wavelengths are detected, thereby accurately measuring the carbon dioxide concentration in the measured gas.

[0023] A novel carbon dioxide concentration sensor described in the embodiment has a housing 1 installed at a detection point during use. After the single-chip microcomputer on the PCB board 5 drives the NDIR infrared light-emitting tube 9 to emit light, the light is reflected multiple times internally by the surface mirror 7 and the internal mirror optical path 11. The infrared receiving probe 8 detects the reflected light and outputs a signal to obtain an initial value. Carbon dioxide gas enters the detection cavity 10 through the air inlet 2. The carbon dioxide inside the detection cavity 10 can absorb light of a specific wavelength, resulting in a weakening of the detected light intensity. The dual-channel infrared receiving probe simultaneously detects both unabsorbed and absorbed wavelengths. The software algorithm performs temperature compensation and device attenuation compensation, thereby accurately measuring the carbon dioxide concentration in the measured gas.

[0024] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and ways to implement the technical solution. The above is only a preferred implementation scheme of the present invention. However, technical personnel in the relevant field should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the attached claims, and all of them are within the scope of protection of the present invention.

Claims

1. A novel carbon dioxide concentration sensor, comprising a housing (1), a base (4), a PCB board (5), an inner cover (6), an infrared receiving probe (8) and an NDIR infrared light-emitting tube (9), wherein the base (4) is provided at the lower end of the housing (1), and the housing (1) and the base (4) are snap-connected, and characterized in that: A PCB board (5) is provided above the base (4), an infrared receiving probe (8) is provided on the PCB board (5), an inner cover (6) is provided above the PCB board (5), an NDIR infrared light-emitting tube (9) is provided on the inner cover (6), the PCB board (5), the inner cover (6), the infrared receiving probe (8) and the NDIR infrared light-emitting tube (9) are all provided in the outer shell (1), a carbon dioxide detection cavity (10) is provided between the outer shell (1) and the inner cover (6), an air inlet (2) is provided on the upper surface of the outer shell (1), an air outlet (3) is provided on the side of the outer shell (1), and both the air inlet (2) and the air outlet (3) are communicated with the detection cavity (10).

2. The novel carbon dioxide concentration sensor according to claim 1 is characterized in that: The PCB board (5) is electrically connected to the infrared receiving probe (8), and the upper end of the infrared receiving probe (8) passes through the inner cover (6).

3. The novel carbon dioxide concentration sensor according to claim 2 is characterized in that: The PCB board (5) is also provided with a power converter, a single chip microcomputer and an operational amplifier.

4. The novel carbon dioxide concentration sensor according to claim 1 is characterized in that: The NDIR infrared light-emitting tube (9) is arranged above the inner cover (6), the NDIR infrared light-emitting tube (9) is arranged on one side of the air inlet (2), and the NDIR infrared light-emitting tube (9) is electrically connected to the PCB board (5).

5. The novel carbon dioxide concentration sensor according to claim 4 is characterized in that: The upper surface of the inner cover (6) is provided with a surface mirror (7).

6. The novel carbon dioxide concentration sensor according to claim 1 is characterized in that: An internal mirror light path (11) is provided on the top surface of the inner wall of the housing (1), and the NDIR infrared light emitting tube (9), the surface mirror (7) and the internal mirror light path (11) are arranged in coordination.

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