Infrared low-power-consumption methane gas sensor

Abstract

The utility model is applicable to the technical field of infrared sensors, and provides an infrared low-power-consumption methane gas sensor which comprises a tubular outer shell with two open ends, an upper cover and a lower cover are detachably mounted at the top end and the bottom end of the outer shell respectively, and a transverse partition plate is fixedly connected in the outer shell. A first mounting hole, a second mounting hole and a third mounting hole are vertically formed in the upper surface of the transverse partition plate in a penetrating mode, and an optical filter detector, a light source and a temperature and humidity sensor are fixedly connected into the first mounting hole, the second mounting hole and the third mounting hole respectively. According to the infrared low-power-consumption methane gas sensor, through the arrangement of the outer shell and the upper cover and the design of the cavity structure in the sensor, on the premise that the measurement precision of the sensor is guaranteed, the integration degree is improved, the power consumption of the sensor is greatly reduced, and the infrared low-power-consumption methane gas sensor can be better integrated on other portable equipment on some specific occasions.

Description

Technical Field

[0001] The utility model belongs to the technical field of infrared sensors, and in particular relates to an infrared low-power consumption methane gas sensor. Background Art

[0002] With the development of gas sensors, different types of sensors have come out one after another, including semiconductor, catalytic combustion, electrochemical, and infrared optical sensors. However, different types of sensors have different disadvantages. For example, semiconductor sensors are easily affected by the environment; catalytic combustion sensors cannot be used in some closed and high-humidity places and have poor stability; sensors based on electrochemical principles have a short lifespan and are easily affected by other factors in the environment; in contrast, sensors based on infrared principles have the advantages of wide application range, long lifespan, high sensitivity, and high reliability.

[0003] Methane, a common natural gas, is widely used in industry and domestic life. However, at high concentrations, methane poses safety risks such as flammability, explosion, asphyxiation, and harm to human health. Therefore, accurately monitoring methane concentrations is crucial for preventing accidents and protecting personnel. Designing a sensor that can monitor methane concentrations in real time is particularly important.

[0004] Non-dispersive infrared (NDIR) gas sensors analyze based on infrared spectral absorption theory. When infrared light passes through the gas being measured, the gas absorbs infrared light of a specific wavelength. By comparing the intensity of the infrared light before and after absorption, concentration information can be inferred based on the Lambert-Beer law.

[0005] However, the cost of NDIR gas sensors is relatively high in long-term use, and the power consumption of the entire sensor is also high. In addition, the sensors currently commonly used generally adopt a straight tube integrated structure. This structure has a large volume or a short optical path, which increases the production cost during the manufacturing process and causes inaccurate measurement results. The large volume makes it difficult to miniaturize and is even more inconvenient to use in some portable measuring instruments.

[0006] Therefore, it is necessary to provide a miniaturized, low-power methane gas sensor based on the infrared absorption principle to overcome the limitations of existing technologies and meet the market demand for high-performance gas sensors. Utility Model Content

[0007] The utility model provides an infrared low-power methane gas sensor, which aims to solve the problems that currently designed sensors generally adopt a straight tube integrated structure, are large in size or have a short optical path, which is not conducive to the integration and application of small devices or portable instruments. NDIR sensors usually require high power consumption and the sensor detection accuracy is not high enough.

[0008] The utility model is realized as follows: an infrared low-power consumption methane gas sensor comprises an outer shell with two ends open and in a tubular shape, wherein an upper cover and a lower cover are detachably mounted on the top and bottom ends of the outer shell respectively;

[0009] A transverse partition is fixedly connected to the inside of the outer shell, and a first mounting hole, a second mounting hole and a third mounting hole are vertically penetrated on the upper surface of the transverse partition. A filter detector, a light source and a temperature and humidity sensor are fixedly connected to the inside of the first mounting hole, the second mounting hole and the third mounting hole respectively. A circuit board is fixedly connected to the bottom of the partition, and the filter detector, the light source and the temperature and humidity sensor are all welded to the circuit board.

[0010] Preferably, a protrusion with arc-shaped two sides is fixedly connected to the outer edge of the lower surface of the upper cover, and both side surfaces of the protrusion are reflective surfaces.

[0011] Preferably, a plurality of air inlet holes are vertically opened through the top of the upper cover.

[0012] Preferably, a plurality of wiring ports are vertically penetrated through the lower surface of the lower cover.

[0013] Preferably, a plurality of first snap-in grooves are transversely penetrated through the upper portion of the outer surface of the outer shell, and a plurality of first snap-in blocks are fixedly connected to the outer surface of the upper cover, which respectively correspond to and fit with the plurality of first snap-in grooves, and the upper cover is detachably mounted inside the upper end of the outer shell through the plurality of first snap-in blocks.

[0014] Preferably, a plurality of second snap-in grooves are transversely penetrated through the lower portion of the outer surface of the outer shell, and a plurality of second snap-in blocks corresponding to and adapted to the plurality of second snap-in grooves are fixedly connected to the outer surface of the lower cover, and the lower cover is detachably mounted inside the lower end of the outer shell through the plurality of second snap-in blocks.

[0015] Beneficial effects

[0016] Compared with the existing technology, the beneficial effects of the present invention are: an infrared low-power methane gas sensor of the present invention is provided with an outer shell and an upper cover. The device improves the integration while ensuring the measurement accuracy of the sensor through the design of the cavity structure in the sensor, greatly reduces the power consumption of the sensor, and can be better integrated into other portable devices in some specific occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the upper cover structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the lower cover structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the inner cavity structure of the outer shell of the present utility model;

[0021] Figure 5 This is a signal conditioning circuit of the present invention.

[0022] In the figure: 1-outer shell, 2-upper cover, 3-lower cover, 4-air inlet, 5-bump, 6-first snap-fit groove, 7-first snap-fit block, 8-second snap-fit groove, 9-second snap-fit block, 10-wiring port, 11-cross partition, 12-first mounting hole, 13-second mounting hole, 14-third mounting hole. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] See also Figure 1-5 The utility model provides a technical solution: an infrared low-power consumption methane gas sensor, comprising an outer shell 1 with two ends open and in a tubular shape, wherein an upper cover 2 and a lower cover 3 are detachably mounted on the top and bottom ends of the outer shell 1, respectively;

[0025] A transverse partition 11 is fixedly connected to the inside of the outer shell 1, and a first mounting hole 12, a second mounting hole 13 and a third mounting hole 14 are vertically penetrated on the upper surface of the transverse partition 11. The insides of the first mounting hole 12, the second mounting hole 13 and the third mounting hole 14 are respectively fixedly connected with a filter detector, a light source and a temperature and humidity sensor. A circuit board is fixedly connected to the bottom of the partition 11, and the filter detector, light source and temperature and humidity sensor are all soldered to the circuit board.

[0026] A plurality of air inlet holes 4 are vertically formed through the top of the upper cover 2 .

[0027] In this embodiment, when the device is in use, the gas to be measured enters the cavity of the outer frame 1 through the air inlet 4. Then, the circuit board drives the light source in the light source driver module to emit stable infrared light, modulated according to a certain frequency. When the infrared light emitted by the infrared light source is absorbed by the methane gas flowing through the gas chamber, these gas molecules to be measured have an absorption effect on the infrared light of a specific wavelength, which conforms to the Lambert-Beer law:

[0028] I=I0e -kcl (1)

[0029] Where I0 is the incident light intensity; I is the outgoing light intensity; k is the methane gas absorption coefficient; c is the methane gas concentration to be measured, and l is the optical path length.

[0030] The device uses dual wavelengths, i.e. dual channels, which are the reference channel and the measurement channel. They are in the same environment and can reduce the influence of environmental factors. The dual channels are controlled by the signal conditioning circuit as shown in the attached figure. Figure 5 As shown, the electrical signal output by the filter detector is amplified and filtered by the circuit to form an analog electrical signal, and then the analog electrical signal is transmitted to the analog-to-digital conversion module, which converts the received analog signal into a digital signal and processes it through a microprocessor. Regarding device selection, low-power devices are used, and finally the concentration information is displayed.

[0031] The temperature and humidity sensors measure the temperature and humidity and feed them back to the microprocessor, which then makes corrections using a temperature compensation algorithm.

[0032] The device improves the integration while ensuring the measurement accuracy of the sensor through the design of the cavity structure in the sensor, greatly reduces the power consumption of the sensor, and can be better integrated into other portable devices in some specific occasions.

[0033] The diaphragm 11 and the outer shell 1 are integrally formed.

[0034] Furthermore, a protrusion 5 with arc-shaped two sides is fixedly connected to the outer edge of the lower surface of the upper cover 2, and both side surfaces of the protrusion 5 are reflective surfaces.

[0035] In this embodiment, the reflective surfaces on both sides of the protrusion 5 play a light reflecting role.

[0036] Furthermore, a plurality of wiring ports 10 are vertically formed through the lower surface of the lower cover 3 .

[0037] In this embodiment, the connection port 10 facilitates the connection of lines.

[0038] Furthermore, a plurality of first snap-in grooves 6 are transversely penetrated through the upper portion of the outer surface of the outer shell 1, and a plurality of first snap-in blocks 7 corresponding to and adapted to the plurality of first snap-in grooves 6 are fixedly connected to the outer surface of the upper cover 2. The upper cover 2 is detachably mounted inside the upper end of the outer shell 1 through the plurality of first snap-in blocks 7.

[0039] A plurality of second snap-in grooves 8 are transversely penetrated through the lower portion of the outer surface of the outer shell 1, and a plurality of second snap-in blocks 9 corresponding to and adapted to the plurality of second snap-in grooves 8 are fixedly connected to the outer surface of the lower cover 3. The lower cover 3 is detachably mounted inside the lower end of the outer shell 1 through the plurality of second snap-in blocks 9.

[0040] In this embodiment, the upper cover 2 and the lower cover 3 are connected to the outer shell 1 by snap-fitting, which is convenient for both disassembly and installation.

[0041] The working principle and usage process of the present invention: After the present invention is installed, the gas to be measured is sent into the cavity of the device through multiple air inlet holes 4, and then the gas can be measured by the detector and other structures in the device. The device improves the integration while ensuring the measurement accuracy of the sensor through the design of the cavity structure in the sensor, greatly reduces the power consumption of the sensor, and can be better integrated into other portable devices in some specific occasions.

[0042] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An infrared low-power methane gas sensor, characterized by: It comprises an outer shell (1) with two open ends and in a tubular shape, wherein an upper cover (2) and a lower cover (3) are detachably mounted on the top and bottom ends of the outer shell (1); A transverse partition (11) is fixedly connected to the interior of the outer shell (1), and a first mounting hole (12), a second mounting hole (13) and a third mounting hole (14) are vertically penetrated on the upper surface of the transverse partition (11); a filter detector, a light source and a temperature and humidity sensor are fixedly connected to the interior of the first mounting hole (12), the second mounting hole (13) and the third mounting hole (14), respectively; a circuit board is fixedly connected to the bottom of the partition (11), and the filter detector, the light source and the temperature and humidity sensor are all welded to the circuit board.

2. The infrared low-power methane gas sensor according to claim 1, characterized in that: The outer edge of the lower surface of the upper cover (2) is fixedly connected with a protrusion (5) with arcs on both sides, and both side surfaces of the protrusion (5) are reflective surfaces.

3. The infrared low-power methane gas sensor according to claim 1, characterized in that: The top end of the upper cover (2) is provided with a plurality of air inlet holes (4) extending vertically therethrough.

4. The infrared low-power methane gas sensor according to claim 1, characterized in that: The lower surface of the lower cover (3) is provided with a plurality of wiring ports (10) extending vertically therethrough.

5. The infrared low-power methane gas sensor according to claim 1, characterized in that: A plurality of first snap-fitting grooves (6) are transversely formed on the upper portion of the outer surface of the outer shell (1); a plurality of first snap-fitting blocks (7) corresponding to and adapted to the plurality of first snap-fitting grooves (6) are fixedly connected to the outer surface of the upper cover (2); the upper cover (2) is detachably mounted on the interior of the upper end of the outer shell (1) via the plurality of first snap-fitting blocks (7).

6. The infrared low-power methane gas sensor according to claim 1, characterized in that: A plurality of second snap-fitting grooves (8) are formed transversely through the lower portion of the outer surface of the outer shell (1); a plurality of second snap-fitting blocks (9) corresponding to and adapted to the plurality of second snap-fitting grooves (8) are fixedly connected to the outer surface of the lower cover (3); the lower cover (3) is detachably mounted inside the lower end of the outer shell (1) via the plurality of second snap-fitting blocks (9).

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