Equal conduction angle sector modulation infrared gas correlation wheel and signal processing method

Abstract

The invention relates to the technical field of gas sensors, and provides an equal conduction angle fan-shaped modulation infrared gas related wheel and a signal processing method, a rotating main body is rotationally arranged and is provided with a reference gas chamber used as a reference cell and a measuring gas chamber used as a measuring cell; the two sides of the reference gas chamber and the two sides of the measuring gas chamber are provided with light-transmitting window sheets for infrared rays to pass through; the infrared light source is arranged on the base body, and infrared light emitted by the infrared light source is used for penetrating through the light-transmitting window, the reference gas chamber and the measuring gas chamber; the chopping disc is arranged on the rotating main body, rotates along with the rotating main body and is used for changing infrared light emitted by the infrared light source into periodic pulse light; the photoelectric positioning ring is arranged on the rotating body, rotates along with the rotating body and is located on the side, close to the infrared light source, of the rotating body. The photoelectric sensor is arranged on the base body and used for detecting the photoelectric positioning ring. According to the technical scheme, the technical problem that in the prior art, the gas concentration measurement precision of an infrared gas related wheel needs to be further improved is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of gas sensor technology, and more specifically, to an equal conduction angle sector-modulated infrared gas correlation wheel and signal processing method. Background Technology

[0002] The correlation wheel in the Gas Filter Correlation Infrared Method (GFRIM) is the core optical component. By using a built-in dual-gas chamber to alternately switch the optical path, it eliminates the influence of interfering gases, achieving precise quantification of the concentration of the analyte gas. This is a key component for improving the instrument's measurement selectivity and accuracy. The core structure of the correlation wheel typically includes two independent sealed gas chambers: a reference chamber and a measurement chamber. The reference chamber is filled with a high concentration of a target gas for reference, providing a benchmark for infrared light absorption. Note that this is not the actual target gas used for measurement, but rather a reference gas that pre-absorbs the characteristic wavelength of infrared light from the target gas. Light "missing" this wavelength is then irradiated onto the target gas being measured. The measurement chamber is filled with a gas such as high-purity nitrogen, which has no infrared absorption characteristics, serving as a transparent channel for infrared light transmission. The infrared gas correlation wheel is driven by a motor to rotate at high speed, causing the two gas chambers to alternately enter the infrared light path. Together with the infrared light source and detector, it can accurately detect the concentration of the gas being measured. It is widely used in many fields such as industrial gas monitoring, ambient air quality monitoring, and portable gas analyzers, and is a key component to ensure the accuracy of gas concentration measurement. In the working system of an infrared gas correlator, the chopper is an indispensable auxiliary component. Its core function is to convert the continuous infrared light emitted by the infrared source into periodic pulsed light. Since the accuracy of infrared gas concentration measurement is directly related to the number of pulsed light data samples, the more data samples, the more densely the system collects the infrared light absorption signal, and the more accurate the calculated gas concentration value. Specifically, the pulsed light, as the basic sample for data acquisition, is received by the detector and converted into an electrical signal. The system compares the difference between the pulse signals corresponding to the reference cell and the measurement cell, and then uses the Beer-Lambert law to infer the concentration of the gas being measured. Therefore, the continuity and density of the pulsed light directly affect the reliability of the measurement results. However, in existing technologies, in order for the system to accurately identify whether the light path alternates between the reference cell and the measurement cell, such as... Figure 1As shown, in addition to the light-transmitting area that periodically allows infrared beams to pass through, a certain area of ​​light-blocking markings must be reserved on the chopper. This light-blocking marking area completely blocks the infrared beam, creating a specific signal blank segment, which serves as an identification mark for switching between the reference cell and the measurement cell. Currently, this light-blocking marking area typically occupies one-quarter of the total chopper area. This means that during the chopper's rotation, it cannot generate effective pulse light for one-quarter of the time, directly reducing the pulse light data sample size by one-quarter. The insufficient data sample size leads to a reduced acquisition density of infrared light absorption signals, making it impossible to fully capture subtle changes during gas absorption, thus affecting the accuracy of signal comparison and ultimately resulting in a decrease in gas concentration measurement accuracy, making it difficult to meet the requirements of high-precision gas detection scenarios. Summary of the Invention

[0003] To overcome the above-mentioned defects, the embodiments of this disclosure provide an equal conduction angle sector-modulated infrared gas correlation wheel and a signal processing method, which solves the technical problem that the gas concentration measurement accuracy of the infrared gas correlation wheel in the prior art needs to be further improved.

[0004] According to one aspect, at least one embodiment of this disclosure provides an equal conduction angle sector-modulated infrared gas correlation wheel, comprising: Matrix; The rotating body is rotatably disposed relative to the base and has a reference gas chamber for serving as a reference cell and a measuring gas chamber for serving as a measuring cell. Both sides of the reference gas chamber and both sides of the measuring gas chamber have light-transmitting windows for passing infrared light. An infrared light source is disposed on the substrate, and the emitted infrared light is used to pass through the light-transmitting window, the reference gas chamber, and the measuring gas chamber; A chopper disk is mounted on the rotating body and rotates with the rotating body. It is located on the side of the rotating body away from the infrared light source and is used to convert the infrared light emitted by the infrared light source into periodic pulse light. A photoelectric positioning ring is disposed on the rotating body and rotates with the rotating body, located on the side of the rotating body closer to the infrared light source; A photoelectric sensor is disposed on the substrate and is used to detect the photoelectric positioning ring.

[0005] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein both the reference gas chamber and the measuring gas chamber are sector-shaped, with equal circumferential angles and symmetrically arranged; The photoelectric positioning ring has an arc-shaped detection part, which is used to be detected by the photoelectric sensor. The detection part corresponds to the position of the reference air chamber and is offset from the position of the measuring air chamber.

[0006] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the photoelectric positioning ring further has an arc-shaped balance section, and the arc-shaped balance section is configured such that its moment of inertia is equal to that of the detected part.

[0007] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the chopper disk has twelve light-blocking fan blades, and a light-transmitting opening is formed between two adjacent light-blocking fan blades. The circumferential angles of the light-blocking fan blades and the light-transmitting opening are equal. Six light-transmitting openings are respectively located on one side of the reference gas chamber and one side of the measuring gas chamber. The arc-shaped balance section and the detected part are both semi-annular and are located on the outer periphery of the light-transmitting opening.

[0008] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the rotating body has an annular adhesive groove on the side near the light-transmitting window, the annular adhesive groove being used to accommodate adhesive supporting the light-transmitting window.

[0009] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the rotating body further comprises: The first gas equalization channel is arc-shaped and located on the outer periphery of the measuring gas chamber. One end of the channel is connected to one side of the reference gas chamber, and the other end is connected to the other side of the reference gas chamber. This channel is used to prevent gas molecules inside the reference gas chamber from concentrating on one side of the reference gas chamber when the reference gas chamber rotates.

[0010] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the rotating body further comprises: The second gas equalization channel is arc-shaped and located on the outer periphery of the reference gas chamber. One end of the channel is connected to one side of the measuring gas chamber, and the other end is connected to the other side of the measuring gas chamber. This channel is used to prevent gas molecules inside the measuring gas chamber from concentrating on one side of the measuring gas chamber when the measuring gas chamber rotates.

[0011] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, which further includes an adjustment component disposed within the first gas equalization channel and the second gas equalization channel, for adjusting the ventilation volume of the first gas equalization channel and the second gas equalization channel.

[0012] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein both the first gas equalization channel and the second gas equalization channel have a tapered channel section in the middle, and the adjustment component includes: A tapered slider is slidably disposed within the first or second air equalization channel, forming an annular channel between itself and the inner wall of the first or second air equalization channel. The tapered slider has a tapered portion that extends into the tapered channel section and has an annular gap between itself and the inner wall of the tapered channel section. A first elastic element acts on the tapered slider to provide a force that causes the tapered portion to extend into the tapered channel section, thereby reducing the annular gap. The annular gap is configured to increase as the rotational speed of the rotating body increases, thereby increasing the gas flow rate.

[0013] For example, at least one embodiment of this disclosure provides an equal conduction angle sector-shaped modulated infrared gas correlation wheel, wherein the adjustment component further includes: The second elastic element and the first elastic element act on both sides of the tapered slider respectively, and the second elastic element and the first elastic element are used to make the tapered slider slide in the center.

[0014] According to another aspect, at least one embodiment of this disclosure provides a signal processing method, characterized in that signal processing is performed using the aforementioned equal conduction angle sector-modulated infrared gas correlation wheel, including the steps of: the photoelectric sensor detecting the photoelectric positioning ring of the infrared gas correlation wheel, and determining whether the infrared light source is directed toward the reference gas chamber or the measuring gas chamber.

[0015] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, by increasing the light-transmitting area of ​​the chopper disk, the number of pulse light data samples increased by a quarter, significantly improving the system's acquisition density of infrared light absorption signals. This enables the system to more accurately capture subtle changes during gas absorption, improving the accuracy of pulse signal comparison between the reference and measurement chambers, thereby enhancing the precision of gas concentration measurement and meeting the requirements of high-precision gas detection scenarios. A combination of photoelectric positioning ring and photoelectric sensor is used to identify the switching between the reference and measurement chambers, replacing the light-shielding marking area on the chopper disk in existing technologies. This design optimizes the chopper disk structure, improves space utilization, simplifies the system structure, and reduces manufacturing and maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an infrared gas correlation wheel in one embodiment of this disclosure; Figure 2 for Figure 1 Another perspective structural diagram of the infrared gas correlation wheel in the embodiment; Figure 3 for Figure 1 A schematic diagram of the internal structure of the infrared gas correlation wheel in the embodiment; Figure 4 for Figure 3 A magnified schematic diagram of part A in the middle; Figure 5 for Figure 1 Another perspective structural diagram of the internal structure of the infrared gas correlation wheel in the embodiment; In the figure: rotating body 200, reference air chamber 210, measuring air chamber 220, light-transmitting window 230, annular rubber groove 240, first air equalization channel 250, second air equalization channel 260, conical channel section 261, infrared light source 300, chopper 400, light-blocking fan blade 410, light-transmitting port 420, photoelectric positioning ring 500, detected part 510, arc-shaped balance section 520, photoelectric sensor 600, adjustment component 700, conical sliding part 710, conical part 711, first elastic element 720, second elastic element 730. Detailed Implementation The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-5As shown, this embodiment illustrates an equal conduction angle sector-shaped modulated infrared gas correlation wheel, including a base, a rotating body 200, an infrared light source 300, a chopper disk 400, a photoelectric positioning ring 500, and a photoelectric sensor 600. The rotating body 200 is rotatably disposed relative to the base and has a reference gas chamber 210 for serving as a reference cell and a measuring gas chamber 220 for serving as a measuring cell. Both sides of the reference gas chamber 210 and both sides of the measuring gas chamber 220 have light-transmitting windows 230 for transmitting infrared light. The infrared light source 300 is disposed on the base and emits infrared light... Light is used to pass through the light-transmitting window 230, the reference gas chamber 210, and the measuring gas chamber 220; the chopper disk 400 is mounted on the rotating body 200 and rotates with the rotating body 200, located on the side of the rotating body 200 away from the infrared light source 300, and is used to convert the infrared light emitted by the infrared light source 300 into periodic pulse light; the photoelectric positioning ring 500 is mounted on the rotating body 200 and rotates with the rotating body 200, located on the side of the rotating body 200 close to the infrared light source 300; the photoelectric sensor 600 is mounted on the substrate and is used to detect the photoelectric positioning ring 500.

[0024] Both the reference gas chamber 210 and the measuring gas chamber 220 are fan-shaped with equal and symmetrical circumferential angles. The photoelectric positioning ring 500 has an arc-shaped detection part 510, which is used to be detected by the photoelectric sensor 600. The detection part 510 corresponds to the position of the reference gas chamber 210 and is offset from the position of the measuring gas chamber 220.

[0025] For example, the base is provided with mounting positions for mounting components such as the rotating body 200, infrared light source 300, and photoelectric sensor 600, to ensure that their relative positions are accurate and stable during operation.

[0026] The substrate provides stable physical support for the entire device, ensuring the relative positional accuracy between the various components. This allows the infrared light emitted by the infrared light source 300 to accurately pass through the air chamber of the rotating body 200, and the photoelectric sensor 600 to accurately detect the photoelectric positioning ring 500, thereby ensuring that the entire system can work normally and stably.

[0027] The rotating body 200 is connected to a motor via a coupling and rotates relative to the base under the drive of the motor. It has two sector-shaped air chambers, namely a reference air chamber 210 and a measuring air chamber 220, with equal circumferential angles and symmetrical arrangement. This symmetrical design helps to ensure the stability and consistency of the reference air chamber 210 and the measuring air chamber 220 when alternately aligning with the infrared light path during rotation. Light-transmitting windows 230 are installed on both sides of the air chambers. The light-transmitting windows 230 are made of a material with high infrared transmittance, ensuring that infrared light can pass smoothly through the air chambers.

[0028] The reference chamber 210 is filled with a high concentration of target gas for reference, providing a benchmark for infrared light absorption; the measuring chamber 220 is filled with a gas without infrared absorption characteristics, such as high-purity nitrogen, serving as a transparent channel for infrared light transmission. When the rotating body 200 rotates, the reference chamber 210 and the measuring chamber 220 alternately align with the infrared light path, cooperating with the infrared light source 300 and the detector to detect the concentration of the gas being measured.

[0029] The infrared light source 300 is fixedly mounted on the substrate, and its position corresponds to the gas chamber of the rotating body 200, ensuring that the emitted infrared light can accurately pass through the light-transmitting window 230, the reference gas chamber 210, and the measuring gas chamber 220. The infrared light source 300 typically uses an infrared light-emitting diode (LED) or a thermal radiation type infrared light source with high stability and specific wavelength output to meet the requirements of different gas detection for infrared light wavelengths.

[0030] The infrared light source 300 emits continuous infrared light, which serves as a signal carrier for detecting gas concentration. When the infrared light passes through the reference gas chamber 210 and the measuring gas chamber 220, it carries information related to gas concentration due to the difference in the degree of absorption of infrared light by the gas in the different gas chambers, providing a basis for subsequent detection and analysis.

[0031] The chopper disk 400 is mounted on the rotating body 200, located on the side of the rotating body 200 away from the infrared light source 300. It rotates together with the rotating body 200, and its disk surface is designed with a light-transmitting area that periodically emits infrared beams. Unlike existing technologies, due to the new positioning method, the chopper disk 400 does not require a specially reserved area for light-shielding markings. The area originally used for light-shielding markings is also designed as a light-transmitting area, thereby increasing the area of ​​the light-transmitting area and improving the efficiency of effective pulse light generation.

[0032] The chopper 400 converts the continuous infrared light emitted by the infrared light source 300 into periodic pulsed light. These pulsed lights serve as the basic samples for data acquisition. After being received by the detector, they are converted into electrical signals, providing data support for the system to calculate gas concentration. The increased light-transmitting area increases the number of pulsed light data samples, improving the system's acquisition density of infrared light absorption signals and thus enhancing the accuracy of gas concentration measurement.

[0033] The photoelectric positioning ring 500 is mounted on the rotating body 200, located on the side of the rotating body 200 closest to the infrared light source 300, and rotates together with the rotating body 200. It has an arc-shaped detection portion 510, which can cooperate with the photoelectric sensor 600 to achieve detection. For example, the detection portion 510 can be a region with high reflectivity, forming a significant optical difference from other parts of the photoelectric positioning ring 500, so that the photoelectric sensor 600 can accurately identify it.

[0034] The detected part 510 of the photoelectric positioning ring 500 is positioned corresponding to the reference gas chamber 210 and offset from the measuring gas chamber 220. Through the detection of the detected part 510 by the photoelectric sensor 600, the system can accurately identify whether the infrared light path is currently aligned with the reference gas chamber 210 or the measuring gas chamber 220, thereby providing accurate positioning information for subsequent data processing and gas concentration calculation, replacing the function of the light-shielding marking area on the chopper in the prior art.

[0035] The photoelectric sensor 600 is a reflective photoelectric sensor, fixedly mounted on the substrate. Its position corresponds to the detected part 510 of the photoelectric positioning ring 500, ensuring accurate detection of the detected part 510. The reflective photoelectric sensor consists of a transmitter and a receiver. The transmitter emits light, and when the light shines on the detected part 510 of the photoelectric positioning ring 500, the reflected light is received by the receiver, thereby generating an electrical signal.

[0036] The photoelectric sensor 600 converts optical signals into electrical signals by detecting the detected part 510 of the photoelectric positioning ring 500, providing the system with an identification signal for switching between the reference gas chamber 210 and the measuring gas chamber 220. Based on this signal, the system distinguishes the pulsed optical signals corresponding to different gas chambers, accurately compares the differences in pulsed signals between the reference and measuring cells, and uses Beer-Lambert's law to inversely calculate the concentration of the gas being measured, thus improving the accuracy of gas concentration measurement.

[0037] During the rotation of the rotating body 200, the photoelectric positioning ring 500 rotates together. When the reference gas chamber 210 is aligned with the infrared light path, the detected part 510 of the photoelectric positioning ring 500 is also within the detection range of the photoelectric sensor 600. The light emitted by the reflective photoelectric sensor 600 shines on the detected part 510 and is reflected back, received by the receiving end and converted into an electrical signal. This signal is transmitted to the data processing system as an identification signal indicating that the reference gas chamber 210 is aligned with the infrared light path. When the measuring gas chamber 220 is aligned with the infrared light path, the detected part 510 leaves the detection range of the photoelectric sensor 600, and the signal output by the photoelectric sensor 600 changes. The data processing system identifies that the measuring gas chamber 220 is aligned with the infrared light path based on this signal change.

[0038] The data processing system distinguishes the pulse light signals corresponding to the reference gas chamber 210 and the measuring gas chamber 220 based on the gas chamber switching identification signal provided by the photoelectric sensor 600. By comparing the differences between these two sets of pulse signals and applying the Beer-Lambert law, the concentration value of the gas being measured is calculated. Because the chopper disk 400 increases the light-transmitting area, the number of pulse light data samples increases, and the system's acquisition density of infrared light absorption signals improves. This allows for more thorough capture of subtle changes during gas absorption, thereby improving the accuracy of signal comparison and ultimately enhancing the precision of gas concentration measurement.

[0039] By increasing the light-transmitting area of ​​the chopper disk 400, the number of pulse light data samples increased by a quarter, significantly improving the system's acquisition density of infrared light absorption signals. This enables the system to more accurately capture subtle changes in the gas absorption process, improves the accuracy of pulse signal comparison between the reference chamber 210 and the measuring chamber 220, and thus enhances the precision of gas concentration measurement, meeting the application requirements of high-precision gas detection scenarios.

[0040] A combination of an optoelectronic positioning ring 500 and an optoelectronic sensor 600 is used to identify the switching between the reference gas chamber 210 and the measuring gas chamber 220, replacing the light-shielding marking area on the chopper disk 400 in the prior art. This design optimizes the structure of the chopper disk 400, improves space utilization, simplifies the system structure, and reduces manufacturing and maintenance costs.

[0041] The reference chamber 210 and the measuring chamber 220 adopt a symmetrical fan-shaped design, and the photoelectric positioning ring 500 is precisely aligned with the position of the chambers, ensuring the stability and consistency of the rotating body 200 during rotation. Meanwhile, the reflective photoelectric sensor 600 has high detection accuracy and reliability, accurately providing identification signals for chamber switching, thus enhancing the stability and reliability of the entire system.

[0042] In some examples, such as Figure 1 As shown, the photoelectric positioning ring 500 also has an arc-shaped balance section 520, which is configured such that its moment of inertia is equal to that of the detected part 510.

[0043] For example, the arc-shaped balancing section 520, like the detected part 510, has an arc-shaped structure, and both are designed as semi-circular. To ensure equal moments of inertia, the arc-shaped balancing section 520 and the detected part 510 differ in size. Specifically, for the portion with smaller inner and outer diameters, its width is correspondingly designed to be larger, so that the moment of inertia of the arc-shaped balancing section 520 is equal to that of the detected part 510.

[0044] During the rotation of the rotating body 200, without the arc-shaped balancing section 520, the presence of only the detected part 510 would cause uneven mass distribution in the rotating body 200, resulting in eccentric rotation. This eccentric rotation generates additional centrifugal force and vibration during rotation, which not only affects the accuracy of measurement but also reduces the service life of the rotating body 200 and connected components such as the motor in the long term. The arc-shaped balancing section 520, by achieving equal moment of inertia with the detected part 510, effectively balances the mass distribution of the rotating body 200 in the circumferential direction, allowing the rotating body 200 to rotate more smoothly, avoiding the negative effects of eccentric rotation, thereby extending the service life of the rotating body 200 and the entire system, and ensuring long-term stable operation of the system.

[0045] Because the arc-shaped balance section 520 ensures the smooth rotation of the rotating body 200, the infrared light emitted by the infrared light source 300 can pass through the reference gas chamber 210, the measuring gas chamber 220, and the chopper disk 400 more stably, resulting in a more stable pulsed light signal. The smooth rotation of the rotating body 200 also reduces wear on various components, further enhancing the stability of the system during long-term operation.

[0046] The arc-shaped balance section 520 effectively prevents eccentric rotation of the rotating body 200, reducing additional stress and wear caused by eccentricity, and significantly extending the service life of the rotating body 200 and related components such as the motor. This not only reduces equipment maintenance and replacement costs but also improves equipment reliability and availability, making it particularly suitable for fields such as industrial gas monitoring and ambient air quality detection where long-term stable operation of equipment is required.

[0047] By balancing the moment of inertia, the rotating body 200 rotates more smoothly, reducing the interference of vibration on infrared light transmission and detection. This enables the system to acquire more stable and accurate pulse light signals during measurement, thereby improving the stability and repeatability of gas concentration measurement. For high-precision gas detection scenarios, the stability of measurement results is crucial, and the design of the arc-shaped balancing section 520 further enhances the applicability of this infrared gas correlation wheel in such scenarios.

[0048] The arc-shaped balancing section 520 works in conjunction with other components to optimize the performance of the entire equal conduction angle sector-modulated infrared gas correlation wheel. It cooperates with the detected part 510 of the photoelectric positioning ring 500 to ensure smooth rotation while achieving accurate gas chamber switching identification. It also coordinates with the sector-shaped gas chamber structure of the rotating body 200, the chopper disk 400, and the infrared light source 300 to improve the accuracy, stability, and reliability of the system's gas concentration detection, enabling the entire device to exhibit superior performance in various application scenarios.

[0049] In some examples, the chopper 400 has twelve light-blocking fan blades 410, with a light-transmitting opening 420 formed between two adjacent light-blocking fan blades 410. The circumferential angles of the light-blocking fan blades 410 and the light-transmitting opening 420 are equal. Six light-transmitting openings 420 are respectively located on one side of the reference gas chamber 210 and one side of the measuring gas chamber 220. The arc-shaped balance section 520 and the detected part 510 are both semi-annular and located on the outer periphery of the light-transmitting opening 420. The rotating body 200 has an annular adhesive groove 240 on the side near the light-transmitting window 230, which is used to accommodate the adhesive supporting the light-transmitting window 230.

[0050] For example, such as Figure 2As shown, the chopper disk 400 is equipped with twelve light-blocking fan blades 410, each fan-shaped with a circumferential angle of 30°. A light-transmitting aperture 420, also fan-shaped with a circumferential angle of 30°, is formed between two adjacent light-blocking fan blades 410. This design allows the chopper disk 400 to regularly convert the continuous infrared light emitted by the infrared light source 300 into periodic pulsed light during rotation. Six light-transmitting apertures 420 are located on one side of the reference gas chamber 210 and one side of the measuring gas chamber 220, respectively. This ensures that both the reference gas chamber 210 and the measuring gas chamber 220 receive the pulsed light modulated by the chopper disk 400 when aligned with the infrared light path, and that the frequency and characteristics of the received pulsed light are consistent, providing a basis for accurate comparison of the pulse signal differences between the reference cell and the measuring cell.

[0051] The chopper disk 400's structural design, through the alternating appearance of light-blocking fan blades 410 and light-transmitting ports 420, chops continuous infrared light into periodic pulses. Since the circumferential angles of both the light-transmitting ports 420 and the light-blocking fan blades 410 are designed to be 30°, the period and duty cycle of the pulses are determined. After the infrared light is processed by the equal conduction angle fan-shaped modulated infrared gas correlation wheel in this embodiment, the charging and discharging times of the measured optical parameters are equal after the processed infrared light passes through the gas to be measured, thus providing stable and regular samples for data acquisition. The reference gas chamber 210 and the measuring gas chamber 220 correspond to the same number of light-transmitting ports 420, ensuring consistency between the two chambers during the detection process and helping to improve the accuracy of gas concentration measurement.

[0052] Optical chopping process: When the chopper disk 400 rotates, the light-blocking fan blade 410 blocks the infrared light source, while the light-transmitting port 420 allows light to pass through, forming an alternating "bright-dark" cycle. Since the circumferential angle of each light-transmitting port 420 and the light-blocking fan blade 410 is 30°, under uniform rotation, the "conduction time" (light transmission time) and "blocking time" of each pulse are equal. A duty cycle of 50% means that the high-level and low-level times are equal. In the infrared gas detection system, after the pulsed light irradiates the gas to be measured (such as CO2 or CH4) in the measuring gas chamber 220, the detector converts the optical signal into an electrical signal. Subsequent circuits, such as an integrating amplifier, need to charge and discharge the electrical signal to extract the gas absorption characteristics. This design ensures equal charge and discharge times, which helps to improve the accuracy of gas concentration measurement. Both the arc-shaped balancing section 520 and the detected part 510 of the photoelectric positioning ring 500 are semi-circular and located on the outer periphery of the light-transmitting port 420. This layout allows the photoelectric positioning ring 500 and the chopper disk 400 to cooperate spatially, achieving precise positioning of the rotating body 200 without affecting the normal operation of the chopper disk 400. The semi-circular design of the arc-shaped balancing section 520 and the detected part 510, combined with their positional relationship with the light-transmitting port 420, satisfies the requirement of rotational inertia balance and ensures that the photoelectric sensor 600 can accurately detect the detected part 510, providing the system with an accurate air chamber switching identification signal.

[0053] The arc-shaped balancing section 520 continues to balance the rotational inertia, ensuring the smooth rotation of the main rotating body 200. The detected part 510 is located on the outer periphery of the light-transmitting port 420, which facilitates the photoelectric sensor 600 to accurately detect its position without interfering with the infrared light modulation by the chopper disk 400. This enables precise identification of the switching between the reference gas chamber 210 and the measuring gas chamber 220, ensuring the accuracy of system data processing and gas concentration calculation.

[0054] An annular adhesive groove 240 is provided on the side of the rotating body 200 near the light-transmitting window 230. The shape of the annular adhesive groove 240 is adapted to the edge of the light-transmitting window 230, and its width and depth are designed according to the amount of adhesive used and the bonding strength requirements. This ensures that the light-transmitting window 230 can fit tightly within the annular adhesive groove 240, and that the adhesive can fully fill the groove, ensuring the flatness of the installation of the light-transmitting window 230 and preventing the light-transmitting window 230 from being installed at an angle due to minor unevenness, thereby reducing measurement accuracy.

[0055] The annular adhesive groove 240 provides a stable support structure for the light-transmitting window 230, while also accommodating the adhesive, enhancing the bonding force between the light-transmitting window 230 and the rotating body 200. During the rotation of the rotating body 200, this connection structure ensures that the light-transmitting window 230 will not shift or loosen, ensuring that infrared light can stably pass through the gas chamber and preventing instability of the light-transmitting window 230 from affecting the accuracy of gas detection. Furthermore, the design of the annular adhesive groove 240 also provides a certain degree of sealing, preventing gas leakage within the gas chamber and ensuring the stability of the gas environment within the chamber.

[0056] The equiangular design of the light-blocking fan blades 410 and the light-transmitting ports 420 on the chopper disk 400, along with the layout of the reference gas chamber 210 and the measuring gas chamber 220 corresponding to the same number of light-transmitting ports 420, ensures the stability and consistency of the pulsed light, improves the accuracy of data acquisition, and thus enhances the precision of gas concentration measurement. The rational layout of the photoelectric positioning ring 500 and the chopper disk 400 achieves precise positioning without interfering with infrared light modulation, further enhancing the stability and reliability of the system.

[0057] The annular adhesive groove 240 on the rotating body 200 effectively enhances the connection strength between the light-transmitting window 230 and the rotating body 200, ensuring the flatness of the light-transmitting window 230, preventing tilting during installation, and preventing the light-transmitting window 230 from loosening due to vibration or other factors, thus affecting the detection. At the same time, the sealing structure formed by the annular adhesive groove 240 and the adhesive prevents gas leakage in the gas chamber, ensuring a stable gas environment within the gas chamber and contributing to improved reliability of the detection results.

[0058] In some examples, such as Figure 3 , Figure 5 As shown, the rotating body 200 also has a first gas equalization channel 250. The first gas equalization channel 250 is arc-shaped and located on the outer periphery of the measuring gas chamber 220. One end of the channel is connected to one side of the reference gas chamber 210, and the other end is connected to the other side of the reference gas chamber 210. This is to prevent the gas molecules inside the reference gas chamber 210 from concentrating on one side of the reference gas chamber 210 when the reference gas chamber 210 is rotated.

[0059] The rotating body 200 also has a second gas equalization channel 260, which is arc-shaped and located on the outer periphery of the reference gas chamber 210. One end of the channel is connected to one side of the measuring gas chamber 220, and the other end is connected to the other side of the measuring gas chamber 220. This channel is used to prevent gas molecules inside the measuring gas chamber 220 from concentrating on one side of the measuring gas chamber 220 when the measuring gas chamber 220 is rotated.

[0060] For example, the first gas equalization channel 250 is arc-shaped and surrounds the outer periphery of the measuring gas chamber 220. Generally, a circular cross-section is chosen to facilitate gas flow. One end of the first gas equalization channel 250 is connected to one side of the reference gas chamber 210, and the other end is connected to the other side of the reference gas chamber 210, ensuring that the gas in the reference gas chamber 210 can form a circulating flow through the channel.

[0061] When the rotating body 200 rotates, the gas in the reference gas chamber 210 may concentrate on one side of the chamber due to centrifugal force and other factors. This can lead to uneven gas distribution within the chamber, affecting the consistency of infrared light absorption and reducing the accuracy of gas concentration detection. The presence of the first gas equalization channel 250 allows the gas in the reference gas chamber 210 to circulate through this channel during rotation, thereby preventing gas molecules from concentrating on one side, ensuring uniform gas distribution within the reference gas chamber 210, improving the stability and consistency of infrared light absorption, and ultimately enhancing the accuracy of gas concentration measurement.

[0062] The second gas equalization channel 260 is also arc-shaped, surrounding the outer periphery of the reference gas chamber 210. Its structural design is similar to the first gas equalization channel 250, having a cross-sectional shape and size that match the first gas equalization channel 250 to ensure consistent gas flow characteristics within the channel. One end of the second gas equalization channel 260 is connected to one side of the measuring gas chamber 220, and the other end is connected to the other side of the measuring gas chamber 220, providing a path for the circulating flow of gas within the measuring gas chamber 220.

[0063] Similar to the reference chamber 210, gas molecules in the measuring chamber 220 may also concentrate on one side during rotation. The second gas equalization channel 260 allows the gas in the measuring chamber 220 to circulate through this channel during rotation, preventing gas molecules from concentrating on one side of the chamber and ensuring uniform gas distribution within the measuring chamber 220. This is crucial for accurately measuring the transmission characteristics of infrared light passing through the measuring chamber 220, and helps improve the accuracy and reliability of gas concentration measurements.

[0064] The first gas equalization channel 250 and the second gas equalization channel 260 effectively avoid unilateral concentration of gas molecules in the reference gas chamber 210 and the measuring gas chamber 220, ensuring uniform gas distribution within the chambers. This makes the absorption and transmission of infrared light within the chambers more stable and consistent, reducing measurement errors caused by uneven gas distribution, thereby improving the accuracy of gas concentration measurement and meeting the requirements of high-precision gas detection.

[0065] The gas equalization channel stabilizes the gas state within the chamber, reducing detection signal deviation caused by instability resulting from high-speed gas rotation. This enhances the stability of the entire equal conduction angle sector-modulated infrared gas correlation wheel system during operation, reduces interference from external factors on the detection results, and improves the system's reliability and repeatability, especially maintaining stable measurement performance during long-term continuous detection.

[0066] The design of the first gas equalization channel 250 and the second gas equalization channel 260 further improves the structure of the air chamber on the rotating main body 200, solving the problem of uneven gas distribution within the air chamber without increasing the complexity and volume of the structure. This optimized air chamber design works better with other components such as the chopper disk 400 and the photoelectric positioning ring 500, improving the overall performance of the device and enabling it to exhibit superior detection performance in different application scenarios.

[0067] In some examples, such as Figure 4As shown, it also includes an adjustment component 700, which is disposed in the first air equalization channel 250 and the second air equalization channel 260, and is used to adjust the air volume of the first air equalization channel 250 and the second air equalization channel 260. The first gas equalization channel 250 and the second gas equalization channel 260 each have a tapered channel section 261 in the middle. The adjustment assembly 700 includes a tapered slider 710 and a first elastic member 720. The tapered slider 710 is slidably disposed in the first gas equalization channel 250 or the second gas equalization channel 260, forming an annular channel between itself and the inner wall of the first gas equalization channel 250 or the second gas equalization channel 260. The tapered slider 710 has a tapered portion 711, which extends into the tapered channel section 261 and has an annular gap between itself and the inner wall of the tapered channel section 261. The first elastic member 720 acts on the tapered slider 710 to provide a force for the tapered portion 711 to extend into the tapered channel section 261, thereby reducing the annular gap. The annular gap is configured to increase as the rotational speed of the rotating body 200 increases, thereby increasing the gas throughput. The adjustment assembly 700 also includes a second elastic element 730, which and the first elastic element 720 act on both sides of the tapered slider 710 respectively. The second elastic element 730 and the first elastic element 720 are used to make the tapered slider 710 slide in the center.

[0068] For example, the adjustment component 700 is set in the first gas equalization channel 250 and the second gas equalization channel 260. Its main function is to adjust the air flow of the channel according to the rotation speed of the rotating body 200, so as to ensure that the gas in the gas chamber can be evenly distributed at different speeds, thereby improving the accuracy and stability of gas concentration detection.

[0069] The tapered slider 710 can slide smoothly within the channel. It has a tapered portion 711 that engages with a tapered channel section 261 in the middle of the first gas equalization channel 250 and the second gas equalization channel 260. As the tapered slider 710 slides within the channel, it forms an annular channel with the inner wall of the channel, through which gas can flow.

[0070] The conical slider 710 adjusts the airflow of the first air equalization channel 250 and the second air equalization channel 260 by changing its position. Specifically, the depth to which the conical portion 711 extends into the conical channel section 261 determines the size of the annular gap, thus affecting the gas flow rate. When the rotational speed of the rotating body 200 changes, the conical slider 710 slides accordingly, changing the annular gap to achieve adaptive adjustment of the airflow.

[0071] The first elastic element 720 is typically a spring, the elastic coefficient of which is selected according to actual needs. It must provide sufficient force to allow the tapered portion 711 to extend into the tapered channel section 261, reducing the annular gap, while also ensuring that the tapered sliding element 710 can overcome the spring force and slide when the rotational speed of the rotating body 200 changes. One end of the spring is fixed to the tapered sliding element 710, and the other end is fixed to the inner wall of the channel or a specific position on the rotating body 200.

[0072] The first elastic element 720 provides a force to the tapered slider 710, causing the tapered portion 711 to extend into the tapered channel section 261, thereby reducing the annular gap and controlling the gas flow rate. Under normal conditions, the first elastic element 720 maintains a certain preload to keep the airflow at an appropriate level. When the rotational speed of the rotating body 200 increases, the pressure generated by the gas flow pushes the tapered slider 710 to overcome the force of the first elastic element 720, increasing the annular gap and increasing the gas flow rate to meet the gas equalization requirements at higher rotational speeds.

[0073] The second elastic element 730 is also a spring, positioned opposite to the first elastic element 720, and acts on both sides of the tapered slider 710. Its elastic coefficient matches that of the first elastic element 720 to ensure coordinated operation. One end of the second elastic element 730 is fixed to the tapered slider 710, and the other end is fixed to the inner wall of the channel or a corresponding position on the rotating body 200.

[0074] The second elastic element 730 works in conjunction with the first elastic element 720 to keep the conical slider 710 centered within the channel. This helps ensure that the annular gap remains uniform along the circumference of the channel under different operating conditions, allowing gas to pass evenly through the annular channel and further optimizing the gas uniformity effect. Simultaneously, the two elastic elements also enhance the stability of the conical slider 710 within the channel, preventing unnecessary shaking due to fluctuations in gas flow and ensuring accurate adjustment of the ventilation volume.

[0075] When the rotating body 200 operates at its normal speed, the first elastic element 720 and the second elastic element 730 work together to keep the conical sliding element 710 in a relatively stable position. At this time, the annular gap remains at a suitable size, allowing the first gas equalization channel 250 and the second gas equalization channel 260 to meet the requirement of uniform gas distribution within the gas chamber. The gas in the reference gas chamber 210 and the measuring gas chamber 220 is ensured to be uniformly distributed through the gas equalization channels. When infrared light passes through the gas chamber, its absorption and transmission characteristics are stable, ensuring the accuracy of gas concentration detection.

[0076] The adjustment component 700 can automatically adjust the airflow of the first gas equalization channel 250 and the second gas equalization channel 260 according to the rotational speed of the rotating body 200. This adaptive adjustment function ensures that the gas in the gas chamber remains uniformly distributed under different rotational speed conditions, effectively improving the accuracy and stability of gas concentration detection and enabling the equipment to adapt to a wider range of working scenarios.

[0077] The combined action of the first elastic element 720 and the second elastic element 730 keeps the conical sliding element 710 centered within the channel, ensuring the uniformity of the annular gap in the circumferential direction. This makes the gas flow more evenly through the gas equalization channel, further optimizing the gas equalization effect, reducing measurement errors caused by uneven gas distribution, and improving the overall performance of the equipment.

[0078] The design of the adjustment component 700 enhances the adaptability of the entire equal conduction angle sector-modulated infrared gas correlation wheel system to speed variations, reducing the impact of speed fluctuations on gas distribution in the gas chamber and detection results. The system can operate stably at different speeds, improving the reliability and durability of the equipment and reducing maintenance costs.

[0079] This embodiment also proposes a signal processing method, which uses an infrared gas correlation wheel for signal processing, including the following steps: the photoelectric sensor 600 detects the photoelectric positioning ring 500 of the infrared gas correlation wheel, and determines whether the infrared light source 300 is directed towards the reference gas chamber 210 or the measuring gas chamber 220.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A sector-modulated infrared gas correlation wheel with equal conduction angle, characterized in that, include: Matrix; The rotating body (200) is rotatably disposed relative to the substrate and has a reference gas chamber (210) for serving as a reference cell and a measuring gas chamber (220) for serving as a measuring cell. Both sides of the reference gas chamber (210) and both sides of the measuring gas chamber (220) have light-transmitting windows (230) for transmitting infrared light. An infrared light source (300) is disposed on the substrate and emits infrared light that passes through the light-transmitting window (230), the reference gas chamber (210), and the measuring gas chamber (220). A chopper disk (400) is disposed on the rotating body (200) and rotates with the rotating body (200). It is located on the side of the rotating body (200) away from the infrared light source (300) and is used to convert the infrared light emitted by the infrared light source (300) into periodic pulse light. Photoelectric positioning ring (500), the photoelectric positioning ring (500) is disposed on the rotating body (200) and rotates with the rotating body (200), located on the side of the rotating body (200) close to the infrared light source (300); A photoelectric sensor (600) is disposed on the substrate and is used to detect the photoelectric positioning ring (500).

2. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 1, characterized in that, Both the reference gas chamber (210) and the measuring gas chamber (220) are fan-shaped, with equal circumferential angles and symmetrical arrangement; The photoelectric positioning ring (500) has an arc-shaped detection part (510), which is used to be detected by the photoelectric sensor (600). The detection part (510) corresponds to the position of the reference gas chamber (210) and is offset from the position of the measuring gas chamber (220).

3. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 2, characterized in that, The photoelectric positioning ring (500) also has an arc-shaped balance section (520), which is configured to have a moment of inertia equal to that of the detected part (510).

4. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 3, characterized in that, The chopper disk (400) has twelve light-blocking fan blades (410), and a light-transmitting opening (420) is formed between two adjacent light-blocking fan blades (410). The circumferential angles of the light-blocking fan blades (410) and the light-transmitting opening (420) are equal. There are six light-transmitting openings (420) on one side of the reference gas chamber (210) and on one side of the measuring gas chamber (220). The arc-shaped balance section (520) and the detection part (510) are both semi-circular and are located on the outer periphery of the light-transmitting opening (420).

5. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 1, characterized in that, The rotating body (200) has an annular adhesive groove (240) on the side near the light-transmitting window (230), the annular adhesive groove (240) being used to accommodate adhesive supporting the light-transmitting window (230).

6. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 1, characterized in that, The rotating body (200) also has: The first gas equalization channel (250) is arc-shaped and located on the outer periphery of the measuring gas chamber (220). One end of the channel is connected to one side of the reference gas chamber (210), and the other end is connected to the other side of the reference gas chamber (210). This channel is used to prevent gas molecules inside the reference gas chamber (210) from concentrating on one side of the reference gas chamber (210) when the reference gas chamber (210) rotates.

7. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 6, characterized in that, The rotating body (200) also has: The second gas equalization channel (260) is arc-shaped and located on the outer periphery of the reference gas chamber (210). One end of the channel is connected to one side of the measuring gas chamber (220), and the other end is connected to the other side of the measuring gas chamber (220). This channel is used to prevent gas molecules inside the measuring gas chamber (220) from concentrating on one side of the measuring gas chamber (220) when the measuring gas chamber (220) rotates.

8. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 7, characterized in that, It also includes an adjustment component (700), which is disposed in the first equalization channel (250) and the second equalization channel (260) for adjusting the ventilation volume of the first equalization channel (250) and the second equalization channel (260).

9. The equal conduction angle sector-shaped modulated infrared gas correlation wheel according to claim 8, characterized in that, Both the first equalization channel (250) and the second equalization channel (260) have a tapered channel section (261) in the middle. The adjustment assembly (700) includes: A tapered slider (710) is slidably disposed within the first air equalization channel (250) or the second air equalization channel (260), forming an annular channel between itself and the inner wall of the first air equalization channel (250) or the second air equalization channel (260). The tapered slider (710) has a tapered portion (711), which extends into the tapered channel section (261) and has an annular gap between itself and the inner wall of the tapered channel section (261). A first elastic element (720) acts on the conical sliding element (710) to provide a force for the conical portion (711) to extend into the conical channel section (261) to reduce the annular gap; wherein the annular gap is configured to increase as the rotational speed of the rotating body (200) increases to increase the gas flow rate; The second elastic element (730) and the first elastic element (720) act on both sides of the tapered slider (710), and the second elastic element (730) and the first elastic element (720) are used to make the tapered slider (710) slide in the center.

10. A signal processing method, characterized in that, Signal processing using the equal conduction angle sector-modulated infrared gas correlation wheel according to any one of claims 1 to 9 includes the following steps: the photoelectric sensor (600) detects the photoelectric positioning ring (500) of the infrared gas correlation wheel and determines whether the infrared light source (300) is directed toward the reference gas chamber (210) or the measuring gas chamber (220).

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