Composite detection device and sensor
By integrating dual-wavelength folded optical paths and co-source signal processing within a single detection cavity, the problems of high cost and complex structure of composite detectors are solved, achieving compact, low-cost, and high-performance smoke and methane detection suitable for complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TSINGHUA UNIVERSITY
- Filing Date
- 2026-02-02
- Publication Date
- 2026-05-12
AI Technical Summary
Existing composite detectors suffer from high cost, complex structure, slow response, and high false alarm rate, making them difficult to apply effectively in space-constrained environments.
By integrating dual-wavelength folded optical paths and co-source signal processing within a single detection cavity and employing a rationally arranged component design, the synchronous acquisition of long-path absorption signals and fixed-angle scattering signals is achieved, reducing hardware complexity and improving detection performance.
It achieves a compact structure, reduced cost, and improved detection performance, making it suitable for complex environments such as residential kitchens, catering establishments, and industrial workshops. It features high integration, high sensitivity, and high identification accuracy for smoke and methane detection.
Smart Images
Figure CN122016725A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of gas detection technology, and in particular to a composite detection device and sensor. Background Technology
[0002] In recent years, building fires and gas explosions have occurred frequently. Smoke and methane, as early-stage fire products and typical combustible gases respectively, have made accurate detection an urgent need in the field of public safety. Traditional solutions generally use separate installations of independent smoke detectors and methane detectors, which are complex, costly, and require a lot of maintenance. Moreover, they are difficult to promote in space-constrained residential kitchens, catering establishments, and industrial workshops.
[0003] To address the need for composite detection, existing technologies primarily employ two approaches: one is to simply stack mature smoke detectors and methane detectors in the same housing, retaining independent gas chambers, optical paths, and algorithms, with only backend data fusion and alarm functionality; the other is to integrate multiple independent detectors at the system level for unified data analysis. The former doubles the number of components, makes optical axis calibration difficult, results in large size and high power consumption; the latter has high construction costs, complex wiring, high maintenance requirements, and strong dependence on independent detectors. Therefore, existing composite detectors generally suffer from high cost, complex structure, slow response, and high false alarm rates. Summary of the Invention
[0004] This application aims to at least partially address one of the technical problems in the related art.
[0005] Therefore, the first objective of this application is to propose a composite detection device. By rationally arranging the various components, this application can simultaneously obtain long-path absorption signals and fixed-angle scattering signals while maintaining a small cavity, thereby achieving the technical effects of compact structure, reduced cost, and improved detection performance.
[0006] The second objective of this application is to propose a sensor.
[0007] To achieve the above objectives, a first aspect of this application provides a composite detection device, comprising: a housing, a controller, a first light source, a second light source, a first photoelectric converter, a second photoelectric converter, a third photoelectric converter, and multiple reflectors. The controller, first light source, second light source, first photoelectric converter, second photoelectric converter, third photoelectric converter, and multiple reflectors are all disposed within the housing. The controller is connected to the first light source, second light source, first photoelectric converter, second photoelectric converter, and third photoelectric converter. The housing has an air inlet and a detection chamber within it, which receives the gas to be detected. The first light source and third photoelectric converter are located on the first direction side of the detection chamber, and the second light source and first photoelectric converter are located on the second direction side of the detection chamber. The multiple reflectors are respectively disposed on the third and fourth direction sides of the detection chamber, and the second photoelectric converter is disposed on the fifth direction side of the detection chamber. The first direction side is opposite to the third direction side, the second direction side is opposite to the fourth direction side, and the fifth direction side is located at a preset angle within the detection chamber.
[0008] In addition, the composite detection device according to the above embodiments of this application may also have the following additional technical features: According to one embodiment of this application, a controller is used to control a first light source and a second light source to emit a first beam and a second beam into a detection cavity, respectively; a plurality of reflectors are used to reflect the first beam and the second beam, respectively, so that the reflected first beam passes through the detection cavity and enters a first photoelectric converter, and the reflected second beam passes through the detection cavity and enters a third photoelectric converter; a second photoelectric converter is used to receive the scattered beams corresponding to the first beam and the second beam scattered by the gas to be detected, respectively.
[0009] According to one embodiment of this application, a plurality of reflectors include a first reflector and a second reflector. The first reflector is disposed on the third direction side of the detection cavity, and the second reflector is disposed on the fourth direction side of the detection cavity, wherein the third direction side and the fourth direction side are perpendicular to each other, and the first direction side and the second direction side are perpendicular to each other.
[0010] According to one embodiment of this application, the composite detection device further includes a driving module and a conversion module. The first light source and the second light source are respectively connected to the controller through the driving module. The first photoelectric converter, the second photoelectric converter and the third photoelectric converter are respectively connected to the controller through the conversion module.
[0011] According to one embodiment of this application, a dustproof net is provided at the air inlet.
[0012] According to one embodiment of this application, the composite detection device further includes a function and alarm module, which is connected to the controller. The function and alarm module includes a mute button, a reset button, a status indicator light, and an alarm device.
[0013] According to one embodiment of this application, the controller is specifically configured to: obtain a preset light source control strategy; and control a first light source and a second light source to alternately output a first beam and a second beam according to the preset light source control strategy, wherein the wavelength of the first beam is a first preset wavelength, the wavelength of the second beam is a second preset wavelength, and the first preset wavelength is greater than the second preset wavelength.
[0014] According to one embodiment of this application, a first photoelectric converter is used to convert a reflected first light beam into a first electrical signal; a third photoelectric converter is used to convert a reflected second light beam into a second electrical signal; and a second photoelectric converter is used to convert a scattered light beam corresponding to the first light beam into a first scattered electrical signal and a scattered light beam corresponding to the second light beam into a second scattered electrical signal.
[0015] According to one embodiment of this application, the controller is further configured to: generate a detection result of the gas to be detected based on a first electrical signal, a second electrical signal, a first scattered electrical signal, and a second scattered electrical signal, wherein the detection result includes methane concentration and smoke concentration.
[0016] To achieve the above objectives, a second aspect of this application provides a sensor including the aforementioned composite detection device.
[0017] The sensor according to the embodiments of this application includes a composite detection device. By rationally arranging the various components, it can simultaneously obtain long-path absorption signals and fixed-angle scattering signals while maintaining a small cavity, thereby achieving the technical effects of compact structure, reduced cost, and improved detection performance. Attached Figure Description
[0018] Figure 1 This is a block diagram of a composite detection device according to some embodiments of this application; Figure 2 This is a schematic diagram of a preset light source control strategy according to some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a composite detection device according to a specific embodiment of this application; Figure 4 This is a block diagram of a composite detection device according to yet another specific embodiment of this application; Figure 5 This is a block diagram of a sensor according to some embodiments of this application. Detailed Implementation
[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0020] The composite detection device and sensor of the present application embodiments are described in detail below with reference to the accompanying drawings.
[0021] Figure 1 This is a block diagram of a composite detection device according to some embodiments of this application. (Refer to...) Figure 1 The composite detection device 100 may include: a housing 110, a controller 120, a first light source 130, a second light source 140, a first photoelectric converter 150, a second photoelectric converter 160, a third photoelectric converter 170, and multiple reflectors. The controller 120, the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, the third photoelectric converter 170, and the multiple reflectors are all disposed within the housing 110. The controller 120 is connected to the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170, respectively. The housing 110 is provided with an air inlet, and the housing 110 is provided with a detection chamber 190, which is used to receive the gas to be detected. The first direction side of the detection chamber 190 is provided with a first light source 130 and a third photoelectric converter 170, and the second direction side of the detection chamber 190 is provided with a second light source 140 and a first photoelectric converter 150. Multiple reflectors are respectively provided on the third direction side and the fourth direction side of the detection chamber 190, and the second photoelectric converter 170 is provided on the fifth direction side of the detection chamber 190. The first direction side is opposite to the third direction side, the second direction side is opposite to the fourth direction side, and the fifth direction side is located at a preset angle of the detection chamber 190.
[0022] Specifically, the composite detection device 100 may include: a housing 110, a controller 120, a first light source 130, a second light source 140, a first photoelectric converter 150, a second photoelectric converter 160, a third photoelectric converter 170, and multiple reflectors. For example, the multiple reflectors include reflector 181 and reflector 182. The number of reflectors can be set according to actual conditions; here, two reflectors are used as an example, and no specific limitation is imposed.
[0023] The housing 110 can utilize an integral injection-molded metal composite structure. The interior of the housing 110 is divided into a detection area and a circuit area by a partition. The detection area needs to allow smoke, methane, and water vapor to enter freely while preventing insects and large particles. The circuit area provides a sealed assembly space for the controller 120 and reserves power and functional interfaces. The controller 120 is responsible for sending periodic scanning signals, receiving photoelectric signals and scattering signals, performing calculations, outputting methane and smoke concentrations, and triggering an alarm when limits are exceeded. For example, an MCU (Microcontroller Unit) can be used as the controller 120. The first light source 130 is used to generate laser light at the methane absorption peak wavelength and also serves as a forward scattering excitation source. For example, a 1654 nm laser can be used as the first light source 130. The second light source 140 is used to generate laser light at the water vapor reference wavelength and also serves as a backscattering excitation source. For example, a 944 nm laser can be used as the second light source 140. The first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170 can use photodiodes to directly convert the energy of incident photons into current signals using the junction photovoltaic effect. Specifically, the first photoelectric converter 150 and the second photoelectric converter 160 are used to collect extinction signals (light intensity attenuation values), and the third photoelectric converter 170 is used to collect scattering signals (scattered light intensity).
[0024] Furthermore, the controller 120, the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, the third photoelectric converter 170, and multiple reflectors are all disposed within the housing 110. The controller 120 is connected to the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170, respectively.
[0025] Specifically, the controller 120, the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170, along with multiple reflectors, are all integrated inside the housing 110. The controller 120 is directly interconnected with the first light source 130, the second light source 140, the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170 via board-level wires. This compresses the optical path, circuitry, and algorithms into a single chamber, eliminating external interconnecting cables and redundant interfaces. This shortens the signal path, reduces noise, and eliminates optical axis drift and assembly tolerances caused by separate structures. Thus, while ensuring a constant methane absorption optical path and smoke scattering angle, it achieves integrated, miniaturized, and low-cost composite detection functionality.
[0026] The housing 110 is equipped with an air inlet. The air inlet is responsible for allowing external air (including smoke, methane, and water vapor) to enter the detection area smoothly, come into contact with the internal optical path, and be detected by the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170.
[0027] In some embodiments of this application, a dustproof net is provided at the air inlet.
[0028] Specifically, the dustproof net is placed inside the air inlet, allowing only gas and tiny particles to pass through while blocking dust, fibers, and insects, ensuring long-term reliable operation.
[0029] The housing 110 is provided with a detection cavity 190, which is used to receive the gas to be detected. A first light source 130 and a third photoelectric converter 170 are provided on the first direction side of the detection cavity 190, and a second light source 140 and a first photoelectric converter 150 are provided on the second direction side of the detection cavity 190. Multiple reflectors are respectively arranged on the third direction side and the fourth direction side of the detection cavity 190, and the second photoelectric converter 170 is arranged on the fifth direction side of the detection cavity 190. The first direction side is opposite to the third direction side, the second direction side is opposite to the fourth direction side, and the fifth direction side is located at a preset angle of the detection cavity 190.
[0030] Specifically, the detection cavity 190 can be an equivalent cylindrical cavity enclosed by a partition inside the housing 110, used to receive the gas to be detected. It can also be understood that the detection cavity 190 refers to a sealed space enclosed by the housing 110 itself, where gas enters and exits only through the inlet, and the internal optical path remains isolated from the outside, thereby ensuring the stability of absorption and scattering measurements. The first light source 130 and the third photoelectric converter 170 are disposed on the first direction side of the detection cavity 190, and the second light source 140 and the first photoelectric converter 150 are disposed on the second direction side of the detection cavity 190. Multiple reflectors, including reflector 181 and reflector 182, are respectively disposed on the third and fourth direction sides of the detection cavity 190. The first direction side is opposite to the third direction side, and the second direction side is opposite to the fourth direction side.
[0031] Thus, with the first light source 130 facing the first photoelectric converter 150 and the second light source 140 facing the third photoelectric converter 170, two straight transmission light paths naturally form at 90° to each other, and their intersection is located at the center of the device, allowing direct measurement of the extinction of methane and water vapor. By attaching reflectors 181 and 182 tightly to their opposite sides, i.e., the third direction side and the fourth direction side, the optical path can be folded by half without increasing the cavity length, thereby increasing the intensity of the absorbed signal.
[0032] Furthermore, the second photoelectric converter 170 is disposed on the fifth direction side of the detection cavity 190, and the fifth direction side is located at a preset angle of the detection cavity 190.
[0033] The preset angle refers to the angle used to indicate the installation position of the second photoelectric converter 170. It is set by technicians according to the actual situation and there is no specific limitation. For example, the preset angle can be set to 45°.
[0034] Specifically, the second photoelectric converter 170 used to measure the scattered signal is placed at a preset angle (e.g., 45°) and has a beam beam structure installed at the front end to ensure that the received light signal mainly comes from the position where the optical path of the detection device intersects.
[0035] In some embodiments of this application, controller 120 is used to control first light source 130 and second light source 140 to emit a first beam and a second beam into detection cavity 190, respectively; multiple reflectors are used to reflect the first beam and the second beam, respectively, so that the reflected first beam passes through detection cavity 190 and enters first photoelectric converter 150, and the reflected second beam passes through detection cavity and enters third photoelectric converter 170; second photoelectric converter 170 is used to receive the scattered beams corresponding to the first beam and the second beam scattered by the gas to be detected, respectively.
[0036] Specifically, the controller 120 controls the first light source 130 and the second light source 140 to emit a first beam and a second beam into the detection cavity 190, respectively. The first beam is a laser beam emitted by the first light source 130 (such as a 1654 nm laser) and used for methane absorption detection after wavelength modulation; the second beam is a laser beam emitted by the second light source 140 (944 nm laser) and used for water vapor reference and smoke scattering detection.
[0037] Multiple reflectors (such as reflector 181 and reflector 182) are used to reflect the first beam and the second beam respectively, so that the reflected first beam passes through the detection cavity 190 and enters the first photoelectric converter 150, and the reflected second beam passes through the detection cavity and enters the third photoelectric converter 170.
[0038] Specifically, reflectors 181 and 182 are located downstream of the first and second beams, refracting the first beam (e.g., a 1654 nm laser) and the second beam (e.g., a 944 nm laser) so that they pass through the detection cavity 190 twice and then enter the first photoelectric converter 150 and the third photoelectric converter 170 respectively. The extinction optical path is thus doubled and the center of the cross-shaped optical path remains unchanged, thereby obtaining two folded absorption optical paths simultaneously in a single cavity, improving the detection sensitivity of methane and water vapor.
[0039] The second photoelectric converter 170 is used to receive the scattered beams corresponding to the first beam and the second beam scattered by the gas to be detected, respectively.
[0040] Specifically, the receiving surface of the second photoelectric converter 170 is aligned with the cross-shaped area of the first and second beams. When the first and second beams pass through the gas to be detected, the particles in the gas scatter light at their respective wavelengths. The second photoelectric converter 170 sequentially captures the two scattered beams and converts them into corresponding current signals (denoted as Isca1 and Isca2), which are then used by the controller 120 to calculate the aerosol concentration and identify the smoke type.
[0041] In some embodiments of this application, the controller 120 is specifically used to: obtain a preset light source control strategy; and control the first light source 130 and the second light source 140 to alternately output a first beam and a second beam according to the preset light source control strategy, wherein the wavelength of the first beam is a first preset wavelength, the wavelength of the second beam is a second preset wavelength, and the first preset wavelength is greater than the second preset wavelength.
[0042] The preset light source control strategy refers to the driving scheme for controlling the first and second light sources. This scheme ensures that the first and second beams operate in a strictly time-division multiplexing manner within the detection cavity 190, guaranteeing that the first and third photoelectric converters obtain pure extinction signals. Simultaneously, it enables the second photoelectric converter to synchronously separate the dual-wavelength scattering components, achieving high-precision synchronous detection of methane, water vapor, and smoke. The preset light source control strategy can be as follows: Figure 2 As shown.
[0043] The first preset wavelength refers to the center emission wavelength set by the controller 120 for the first light source 130, which is located in the near-infrared region. This allows the light beam to be absorbed by the target gas molecules when passing through the detection cavity 190, and is used to obtain the extinction signal and invert the gas concentration. The second preset wavelength refers to the center emission wavelength set by the controller 120 for the second light source 140, which is used to supplement the extinction channel and provide scattering contrast information.
[0044] It should be noted that the first and second preset wavelengths can be set by technicians according to actual business needs. Other wavelengths can be used for different types of target gases; however, different magnification scattering signal amplification devices need to be selected based on the specific wavelength, and no specific restrictions are imposed here.
[0045] For example, the first preset wavelength can be set to 1654 nm, corresponding to the strong absorption peak of methane. The second preset wavelength can be set to 944 nm, corresponding to the reference absorption of water vapor and the enhanced backscattering of smoke, used to simultaneously compensate for water vapor and extract aerosol scattering characteristics. Specifically, fire smoke particles scatter weakly to long wavelengths and the scattering is concentrated in the forward direction, so the 1653 nm light source uses forward scattering; fire smoke particles scatter strongly to short wavelengths, so the 944 nm light source uses backscattering. The two are emitted in a time-division manner to achieve simultaneous detection of methane, water vapor, and smoke in a single cavity.
[0046] In some embodiments of this application, a first photoelectric converter 150 is used to convert a reflected first light beam into a first electrical signal; a third photoelectric converter 170 is used to convert a reflected second light beam into a second electrical signal; and a second photoelectric converter 120 is used to convert a scattered light beam corresponding to the first light beam into a first scattered electrical signal and a scattered light beam corresponding to the second light beam into a second scattered electrical signal.
[0047] The first electrical signal refers to the current / voltage signal generated by the first photoelectric converter 150 from the intensity change of the first light beam after reflection and passing through the detection cavity 190, used to calculate methane extinction. The second electrical signal refers to the current / voltage signal generated by the third photoelectric converter 170 from the intensity change of the second light beam after reflection and passing through the detection cavity 190, used to calculate water vapor extinction. The first scattered electrical signal refers to the current / voltage signal generated by the second photoelectric converter 170 from the scattered light obtained after the first light beam is scattered by aerosol particles, used to invert smoke concentration. The second scattered electrical signal refers to the current / voltage signal generated by the second photoelectric converter 170 from the scattered light obtained after the second light beam is scattered by aerosol particles, used in conjunction with the first scattered electrical signal to identify smoke type and particle size characteristics.
[0048] In some embodiments of this application, the controller 120 is further configured to generate a detection result of the gas to be detected based on a first electrical signal, a second electrical signal, a first scattered electrical signal, and a second scattered electrical signal, wherein the detection result includes methane concentration and smoke concentration.
[0049] In a specific embodiment of this invention, the controller 120 first processes the first electrical signal (denoted as Iext1) and the second electrical signal (denoted as Iext2). Based on Beer-Lambert's law of gas absorption, the gas concentrations of methane and water vapor are calculated from the absorption peak intensity using direct absorption spectroscopy. Subsequently, the first scattered electrical signal (denoted as Isca1) and the second scattered electrical signal (denoted as Isca2) are processed. According to Mie scattering theory, the scattered signal is proportional to the aerosol particle concentration, and the aerosol particle concentration is calculated. Finally, Isca1 / Isca2, Isca1 / Iext1, and Isca2 / Iext2 are calculated. Based on the relationship between these ratios and the physical properties of the aerosol particles, the types of aerosol particles are distinguished, thereby achieving effective identification of fire smoke and completing the composite detection function.
[0050] The composite detection device 100 of this application embodiment is centered on a single detection cavity 190, and integrates a controller 120, a first light source 130, a second light source 140, a first photoelectric converter 150, a second photoelectric converter 160, a third photoelectric converter 170, and reflectors 181 and 182 all within a housing 110. The first and second light sources emit light in a time-division manner under a preset light source control strategy. After passing through the cavity twice via a cross-folded optical path, the extinction signals are collected by the first and third photoelectric converters, respectively. The second photoelectric converter simultaneously collects dual-wavelength scattering signals. The controller 120 calculates the methane and water vapor concentrations from the extinction signals based on Beer-Lambert's law, further obtaining the aerosol concentration. It then identifies the particle type using the ratios of Isca1 / Isca2, Isca1 / Iext1, and Isca2 / Iext2, thereby outputting the methane concentration, smoke concentration, and interference source type simultaneously within a single gas chamber, achieving highly integrated, low-cost, and highly sensitive smoke-methane composite detection.
[0051] The composite detection device of this application integrates a dual-wavelength folded optical path and co-source signal processing within a single detection cavity, achieving absorption optical path multiplication, scattering angle locking, and multi-parameter synchronous calculation with minimal optical components. This reduces structural complexity, assembly errors, and manufacturing costs while improving detection sensitivity and recognition accuracy, thus achieving high integration, miniaturization, and reliable operation of the composite detector.
[0052] As a specific embodiment of this application, the composite detection device of this application refers to... Figure 3 .
[0053] In some embodiments of this application, such as Figure 4 As shown, the composite detection device 100 also includes a drive module 1001 and a conversion module 1002. The first light source 130 and the second light source 140 are respectively connected to the controller 120 through the drive module 1001. The first photoelectric converter 150, the second photoelectric converter 160 and the third photoelectric converter 170 are respectively connected to the controller 120 through the conversion module 1002.
[0054] The driving module 1001 converts the digital scanning signal output by the controller 120 into a precision current, driving the first light source 130 and the second light source 140 to emit a stable beam according to a preset light source control strategy. The conversion module 1002 amplifies and converts the current signals output by the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170 into voltage, filters them, and sends them to the controller 120 to achieve high signal-to-noise ratio light intensity sampling.
[0055] Specifically, the drive module 1001 converts the digital control quantity output by the controller 120 into a drive current, enabling the first light source 130 and the second light source 140 to emit stable laser light according to a preset timing sequence in the preset light source control strategy. The conversion module 1002 amplifies, filters, and converts the current generated by the first photoelectric converter 150, the second photoelectric converter 160, and the third photoelectric converter 170 into a standard voltage signal for sampling by the controller 120, thus realizing a high-fidelity link.
[0056] The drive module 1001 and the conversion module 1002 are integrated into one unit, which accurately converts the digital control quantity into stable optical power and amplifies the microampere-level photocurrent into a voltage signal with high fidelity, reducing noise and drift. This enables the composite detection device to simultaneously obtain high-sensitivity, high-resolution extinction and scattering information in a single gas chamber, achieving integrated, miniaturized, and low-cost operation.
[0057] In some embodiments of this application, such as Figure 4 As shown, the composite detection device 100 also includes a function and alarm module 1003, which is connected to the controller 120. The function and alarm module 1003 includes a mute button, a reset button, a status indicator light, and an alarm device.
[0058] Specifically, the function and alarm module 1003 can be integrated into the outer surface of the housing 110. The mute button can be used to temporarily turn off the audible alarm, and the reset button can be used to restart the system after troubleshooting. The status indicator can display the three states of running, fault, and alarm through red, yellow, and green. The alarm device can use a high-decibel buzzer and an LED (Light Emitting Diode) flashing light. When the controller 120 determines that the methane concentration or smoke concentration exceeds the set threshold, it immediately drives the audible and visual alarm to realize on-site real-time warning.
[0059] In this embodiment, the function and alarm module 1003 is directly connected to the controller 120, integrating mute, reset, status indication, and audible and visual alarms onto the same panel of the housing 110, eliminating the need for external alarm wiring. The button allows for one-click mute or restart on-site, reducing manual intervention time. The three-color LED instantly displays the three states of operation, fault, and alarm, allowing for visual inspection without opening the cover. The built-in high-decibel buzzer and LED flashlight are synchronously driven by the controller 120 when the concentration exceeds the threshold, providing dual audible and visual warnings to ensure immediate detection even in noisy environments, thereby improving the ease of use, maintainability, and on-site safety alert capabilities of the composite detection device 100.
[0060] Through the aforementioned composite detection device, this application offers the following advantages over related technologies: (1) Simultaneous detection of smoke, water vapor and methane is achieved within a single detection device and detection structure, with high integration; (2) The dual laser light source simultaneously meets the requirements for water vapor and methane detection and solves the problem of aerosol particulate matter identification. (3) The two optical paths use the same set of reflector structures, which reduces hardware costs; (4) The folded optical path design significantly improves the accuracy of methane extinction measurement and the intensity of smoke scattering signal, while not affecting the accuracy of detection; (5) The overall device is small-scale and robust, and is suitable for complex environments such as residential kitchens, catering establishments and industrial workshops.
[0061] This application also provides a sensor, referring to... Figure 5 The sensor 500 includes the aforementioned composite detection device 100.
[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0065] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
[0066] Any process or method described in the flowchart or otherwise herein is to be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.
[0067] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0068] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0069] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
[0070] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0071] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.
[0072] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.
[0073] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A composite detection device, characterized in that, include: The system comprises a housing, a controller, a first light source, a second light source, a first photoelectric converter, a second photoelectric converter, a third photoelectric converter, and multiple reflectors. The controller, the first light source, the second light source, the first photoelectric converter, the second photoelectric converter, the third photoelectric converter, and the multiple reflectors are all housed within the housing. The controller is connected to the first light source, the second light source, the first photoelectric converter, the second photoelectric converter, and the third photoelectric converter, respectively. The housing is provided with an air inlet, and the housing is provided with a detection chamber, wherein the detection chamber is used to receive the gas to be detected; The detection cavity is provided with the first light source and the third photoelectric converter on the first direction side, and the detection cavity is provided with the second light source and the first photoelectric converter on the second direction side; The plurality of reflectors are respectively disposed on the third and fourth direction sides of the detection cavity, and the second photoelectric converter is disposed on the fifth direction side of the detection cavity; wherein, The first directional side is opposite to the third directional side, the second directional side is opposite to the fourth directional side, and the fifth directional side is located at a preset angle of the detection cavity.
2. The composite detection device according to claim 1, characterized in that, The controller is used to control the first light source and the second light source to emit a first beam and a second beam into the detection cavity, respectively; The plurality of reflectors are used to reflect the first beam and the second beam respectively, so that the first beam after reflection passes through the detection cavity and enters the first photoelectric converter, and the second beam after reflection passes through the detection cavity and enters the third photoelectric converter. The second photoelectric converter is used to receive the scattered beams corresponding to the first beam and the second beam scattered by the gas to be detected, respectively.
3. The composite detection device according to claim 2, characterized in that, The plurality of reflectors includes a first reflector and a second reflector. The first reflector is disposed on the third direction side of the detection cavity, and the second reflector is disposed on the fourth direction side of the detection cavity. The third direction side and the fourth direction side are perpendicular to each other, and the first direction side and the second direction side are perpendicular to each other.
4. The composite detection device according to claim 2, characterized in that, It also includes a driving module and a conversion module. The first light source and the second light source are respectively connected to the controller through the driving module. The first photoelectric converter, the second photoelectric converter and the third photoelectric converter are respectively connected to the controller through the conversion module.
5. The composite detection device according to claim 2, characterized in that, A dustproof screen is installed at the air inlet.
6. The composite detection device according to claim 2, characterized in that, It also includes a function and alarm module, which is connected to the controller. The function and alarm module includes a mute button, a reset button, a status indicator light, and an alarm device.
7. The composite detection device according to claim 2, characterized in that, The controller is specifically used for; Obtain the preset light source control strategy; According to the preset light source control strategy, the first light source and the second light source are controlled to alternately output the first beam and the second beam, wherein the wavelength of the first beam is a first preset wavelength, the wavelength of the second beam is a second preset wavelength, and the first preset wavelength is greater than the second preset wavelength.
8. The composite detection device according to claim 4, characterized in that, The first photoelectric converter is used to convert the reflected first light beam into a first electrical signal; The third photoelectric converter is used to convert the reflected second light beam into a second electrical signal; The second photoelectric converter is used to convert the scattered beam corresponding to the first beam into a first scattered electrical signal, and to convert the scattered beam corresponding to the second beam into a second scattered electrical signal.
9. The composite detection device according to claim 8, characterized in that, The controller is also used for; The detection result of the gas to be detected is generated based on the first electrical signal, the second electrical signal, the first scattered electrical signal, and the second scattered electrical signal, wherein the detection result includes methane concentration and smoke concentration.
10. A sensor, characterized in that, Includes the composite detection device as described in any one of claims 1-9.