Infrared gas sensor

Abstract

The infrared gas sensor comprises an upper gas chamber, a lower gas chamber, a detection element mounting block and a light source mounting block, the detection element mounting block is mounted on the left sides of the upper gas chamber and the lower gas chamber, an infrared detection element is mounted on the detection element mounting block, a detection element circuit board is mounted on the left side of the infrared detection element, and the light source mounting block is mounted on the detection element circuit board. Light source installation blocks are installed on the right sides of the upper air chamber and the lower air chamber, infrared light sources are installed on the light source installation blocks, and light source circuit boards are installed on the right sides of the infrared light sources. According to the infrared gas sensor provided by the embodiment of the invention, the infrared light source, the light source circuit board, the infrared detection element and the detection element circuit board are mounted on the upper gas chamber and the lower gas chamber, so that the gas concentration can be rapidly detected, and the infrared gas sensor is good in stability, small in size and capable of meeting the gas sampling detection requirements of multiple occasions and multiple fields.

Description

Technical Field

[0001] The present application relates to the technical field of infrared gas analyzers, and in particular to an infrared gas sensor. Background Art

[0002] Infrared gas sensors are gas sensing devices that use the selective absorption characteristics of different gases for infrared spectra of different wavelengths and the relationship between gas concentration and absorption intensity to analyze the concentration of specific gases. Compared with other sensors, they have the advantages of long life, fast response speed, good stability and low cost.

[0003] Existing infrared gas sensors have a slow response speed, which often takes several seconds to tens of seconds. They have poor stability and are easily affected by factors such as ambient temperature, humidity, gas flow rate, and gas pressure. They are also large in size and require a large gas chamber to absorb the infrared spectrum. Some fields require gas sensors to respond quickly (milliseconds), have good stability, and be small in size. The above factors have resulted in existing infrared gas sensors being unable to meet the gas sampling needs of some fields.

[0004] In order to solve the above problems, we made improvements and proposed an infrared gas sensor. Summary of the invention

[0005] In order to solve one of the above-mentioned technical defects, an infrared gas sensor is provided in an embodiment of the present application, which solves the technical problems that the existing infrared gas sensors have slow response speed, poor stability, large size, and cannot meet the gas sampling needs in some fields.

[0006] According to the first aspect of the embodiment of the present application, there is provided an infrared gas sensor, comprising: an upper air chamber, a lower air chamber, a detection element mounting block and a light source mounting block, wherein the detection element mounting block is mounted on the left side of the upper air chamber and the lower air chamber, an infrared detection element is mounted on the detection element mounting block, a detection element circuit board is mounted on the left side of the infrared detection element, a light source mounting block is mounted on the right side of the upper air chamber and the lower air chamber, an infrared light source is mounted on the light source mounting block, and a light source circuit board is mounted on the right side of the infrared light source.

[0007] Furthermore, filters are provided inside the upper air chamber and the lower air chamber. The filters are located on the left side of the light source mounting block, and the filters are located on the right side of the detection element mounting block.

[0008] Furthermore, an air inlet and an air outlet are provided at the top of the upper air chamber, an air flow channel is provided at the center of the bottom of the upper air chamber, and two ends of the air flow channel are respectively connected to the air inlet and the air outlet.

[0009] Furthermore, a positioning pin is provided between the upper air chamber and the lower air chamber.

[0010] Furthermore, the light source mounting block and the detection element mounting block are fixed between the upper air chamber and the lower air chamber through set screw holes.

[0011] Preferably, the infrared light source is an infrared LED type light source.

[0012] Preferably, the infrared detection element is an infrared photodiode device.

[0013] Furthermore, the wavelength ranges of the infrared light sources are 3.30-3.44 μm, 4.1-4.3 μm and 4.4-4.6 μm respectively.

[0014] Furthermore, the infrared detection element detects peak wavelengths of 3.7-3.8 μm, 4.5-4.8 μm and 4.9-5.0 μm respectively.

[0015] By using an infrared gas sensor provided in an embodiment of the present application, an infrared light source, a light source circuit board, an infrared detection element and a detection element circuit board are installed on the upper gas chamber and the lower gas chamber, so that rapid detection of gas concentration can be achieved, and it has good stability and a small size, which can meet the gas sampling and detection needs in multiple occasions and fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of the disassembled structure provided in an embodiment of the present application;

[0019] Figure 3 It is a schematic diagram of the structure of the upper air chamber and the bottom air chamber provided in an embodiment of the present application.

[0020] In the figure: 1-upper air chamber, 2-filter, 3-infrared light source, 4-light source circuit board, 5-light source mounting block, 6-lower air chamber, 7-detection element mounting block, 8-infrared detection element, 9-detection element circuit board, 10-positioning pin. DETAILED DESCRIPTION

[0021] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the process of implementing the present application, the inventors found that the existing infrared gas sensors have slow response speed, poor stability, and large size, and cannot meet the needs of gas sampling in some fields.

[0023] In response to the above problems, Figure 2 As shown, an infrared gas sensor is provided in an embodiment of the present application, including: an upper air chamber, a lower air chamber, a detection element mounting block and a light source mounting block. A detection element mounting block is installed on the left side of the upper air chamber and the lower air chamber, an infrared detection element is installed on the detection element mounting block, a detection element circuit board is installed on the left side of the infrared detection element, a light source mounting block is installed on the right side of the upper air chamber and the lower air chamber, an infrared light source is installed on the light source mounting block, a light source circuit board is installed on the right side of the infrared light source, an infrared light source, a light source circuit board, an infrared detection element and a detection element circuit board are installed on the upper air chamber and the lower air chamber, so that rapid detection of gas concentration can be achieved, and the sensor has good stability and small size, which can meet the gas sampling and detection needs in multiple occasions and fields.

[0024] In this embodiment, the model of the light source circuit board is the mD-1c driving module produced by LED Microsensor NT, and the model of the detection element circuit board is the PAb amplification module produced by LED Microsensor NT.

[0025] In this embodiment, Figure 2 As shown, filters are provided inside the upper air chamber and the lower air chamber. The filters are located on the left side of the light source mounting block and on the right side of the detection element mounting block. The filters are used to block air leakage in the air chamber and filter part of the infrared spectrum.

[0026] In this embodiment, Figure 2 and Figure 3 As shown, the top of the upper air chamber is provided with an air inlet and an air outlet, and the bottom center of the upper air chamber is provided with an air flow channel, and the two ends of the air flow channel are connected to the air inlet and the air outlet respectively. There are 3 set screw holes on the left and right sides of the top of the upper air chamber for fixing the light source mounting block and the detection element mounting block, and there are positions for installing the filter, the light source mounting block and the detection element mounting block on the left and right sides of the bottom. There are 4 screw holes at the four corners of the bottom and 2 positioning pin holes on the edge for fixing with the lower air chamber.

[0027] In this embodiment, Figure 2As shown, there are positions for installing filters, light source mounting blocks and detection element mounting blocks on the left and right sides of the top of the lower air chamber. The top contains 4 screw holes and 2 positioning pin holes for fixing with the upper air chamber, and the bottom contains 4 screw holes for fixing the infrared gas sensor.

[0028] In this embodiment, Figure 2 As shown, the light source mounting block and the detection element mounting block are fixed between the upper air chamber and the lower air chamber through the set screw holes.

[0029] In this embodiment, the infrared light source is an infrared LED type light source, which can efficiently convert electrical energy into light energy, and can emit light of a specific wavelength. This application has installed 3 infrared LED type light sources of different specifications, which can emit infrared spectra with wavelengths ranging from 3.30 to 3.44 μm, 4.1 to 4.3 μm, and 4.4 to 4.6 μm.

[0030] In this embodiment, the infrared detection element is an infrared photodiode device, which can convert light energy of a specific wavelength into electrical energy. This application installs three infrared detection elements of different specifications, which can detect infrared spectra with peak wavelengths of 3.7-3.8 μm, 4.5-4.8 μm and 4.9-5.0 μm respectively.

[0031] How this application works:

[0032] The light source circuit board drives the infrared light source to flash at a fixed frequency. The infrared light passes through the air chamber, is absorbed, and is received by the infrared detection element. The weak signal is amplified and then output.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An infrared gas sensor, characterized in that: include: An upper air chamber, a lower air chamber, a detection element mounting block and a light source mounting block, wherein the detection element mounting block is mounted on the left side of the upper air chamber and the lower air chamber, an infrared detection element is mounted on the detection element mounting block, a detection element circuit board is mounted on the left side of the infrared detection element, a light source mounting block is mounted on the right side of the upper air chamber and the lower air chamber, an infrared light source is mounted on the light source mounting block, and a light source circuit board is mounted on the right side of the infrared light source.

2. The infrared gas sensor according to claim 1, characterized in that: Optical filters are arranged inside the upper air chamber and the lower air chamber. The optical filters are located on the left side of the light source mounting block, and the optical filters are located on the right side of the detection element mounting block.

3. The infrared gas sensor according to claim 2, characterized in that: An air inlet and an air outlet are arranged on the top of the upper air chamber, an air flow channel is arranged in the center of the bottom of the upper air chamber, and two ends of the air flow channel are respectively connected to the air inlet and the air outlet.

4. The infrared gas sensor according to claim 3, characterized in that: A positioning pin is provided between the upper air chamber and the lower air chamber.

5. The infrared gas sensor according to claim 1, characterized in that: The light source mounting block and the detection element mounting block are fixed between the upper air chamber and the lower air chamber through set screw holes.

6. The infrared gas sensor according to claim 1, characterized in that: The infrared light source is an infrared LED type light source.

7. The infrared gas sensor according to claim 1, characterized in that: The infrared detection element is an infrared photodiode device.

8. The infrared gas sensor according to any one of claims 1 to 7, characterized in that: The wavelengths emitted by the infrared light sources are in the range of 3.30-3.44 μm, 4.1-4.3 μm and 4.4-4.6 μm respectively.

9. The infrared gas sensor according to any one of claims 1 to 7, characterized in that: The infrared detection element detects peak wavelengths of 3.7-3.8 μm, 4.5-4.8 μm and 4.9-5.0 μm respectively.

Images