Gas detection device and gas detection sensor

Abstract

The invention provides a gas detection device and a gas detection sensor, the gas detection device comprises a gas chamber with a gas inlet hole, a light source, a light filtering device, a photoelectric detector array and a detection module, the light source, the light filtering device and the photoelectric detector array are all arranged in the gas chamber; the light filtering device is used for carrying out light splitting treatment on light emitted by the light source to obtain at least one spectrum of which the wavelength corresponds to gas to be detected, the spectrum is transmitted to the photoelectric detector array through a corresponding set light path, and the set light path passes through the gas entering the gas chamber through the gas inlet hole; the photoelectric detector array is used for performing photoelectric conversion processing on the received spectrum to obtain an electric signal; and the detection module is used for detecting the concentration information of the gas to be detected in the gas chamber according to the electric signal.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of gas detection, and more specifically, to a gas detection device and a gas detection sensor. Background Art

[0002] With the continuous development of science and technology, more and more fields involve gas concentration detection. For example, in industrial production, there are often many types of harmful gases, and the changes in the concentrations of different gas components will have a great impact on industrial production. At the same time, when harmful gases exceed a certain concentration, they will also cause irreparable damage to the human body.

[0003] In the related art, gas sensors generally use tunable semiconductor laser absorption spectroscopy technology to measure gas concentration, using the fact that gases have a certain spectral absorption capacity to achieve the purpose of detection. For multi-channel gas measurements, the solution in the related art uses optical switches, but the response speed of the system is limited by the switching speed of the optical switch, and real-time monitoring of the gas to be measured cannot be achieved. At the same time, since each optical switch corresponds to a gas absorption chamber, the difficulty of system installation, laying and maintenance is increased, the cost is high, and the application of optical gas sensing systems is greatly limited. Summary of the invention

[0004] An object of the embodiments of the present disclosure is to provide a gas detection device and a gas detection sensor.

[0005] According to a first aspect of an embodiment of the present disclosure, a gas detection device is provided, comprising a gas chamber having an air inlet, a light source, a filter device, a photodetector array and a detection module, wherein the light source, the filter device and the photodetector array are all arranged in the gas chamber;

[0006] The optical filter device is used to perform spectroscopic processing on the light emitted by the light source to obtain a spectrum with at least one wavelength corresponding to the gas to be measured, and the spectrum is transmitted to the photodetector array through a corresponding set optical path, wherein the set optical path passes through the gas entering the gas chamber through the air inlet hole;

[0007] The photodetector array is used to perform photoelectric conversion processing on the received spectrum to obtain an electrical signal;

[0008] The detection module is used to detect the concentration information of the gas to be detected in the gas chamber according to the electrical signal.

[0009] Optionally, the optical filter device is a bandpass filter or a diffraction grating.

[0010] Optionally, the set optical path includes a first optical path and a second optical path, the first end of the first optical path is connected to the filter device, the first end of the second optical path is connected to the photodetector array, and the second end of the first optical path and the second end of the second optical path are arranged opposite to each other near the air inlet.

[0011] Optionally, the photodetector array includes photodetectors corresponding to each spectrum in one-to-one correspondence, and each spectrum is transmitted to the corresponding photodetector through a corresponding set optical path.

[0012] Optionally, the gas detection device further includes a focusing reflector cup corresponding to each photoelectric detector one by one, each focusing reflector cup is arranged above the corresponding photoelectric detector, and each photoelectric detector receives a corresponding spectrum through the corresponding focusing reflector cup.

[0013] Optionally, there are at least two types of the gas to be tested, and the detection module is used to perform mutual verification based on concentration information of the at least two gases to be tested.

[0014] Optionally, the gas detection device further includes an environmental sensor, which is used to detect environmental data in the gas chamber; the detection module is also used to detect concentration information of the gas to be detected in the gas chamber based on the environmental data.

[0015] Optionally, the environmental sensor includes at least one or more of a temperature sensor, a humidity sensor, and an air pressure sensor.

[0016] Optionally, the optical filter device is arranged at a position close to the light source.

[0017] According to a second aspect of the present disclosure, a gas is provided, comprising the gas detection device as described in the first aspect of the present disclosure.

[0018] Through the embodiments of the present disclosure, the concentration information of a single gas to be tested can be accurately detected, and the concentration information of multiple gases to be tested can also be detected simultaneously, realizing the function of a gas analyzer, and the device has a small size, is easy to integrate, and has little cross-interference between gases.

[0019] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0021] Figure 1 is a block diagram of a gas detection device according to an embodiment of the present disclosure;

[0022] Figure 2 is a schematic structural diagram of a gas detection device according to an embodiment of the present disclosure;

[0023] Figure 3 is a block diagram of a gas detection device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0025] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0026] Technologies, methods and equipment known to persons of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered part of the specification.

[0027] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0029] <Device Example>

[0030] The present disclosure provides a gas detection device, such as Figure 1 As shown, the gas detection device 10 may include a gas chamber 11 having an air inlet 111, a light source 12, a filter device 13, a photodetector array 14 and a detection module 15. The light source 12, the filter device 13 and the photodetector array 14 are all arranged in the gas chamber 11.

[0031] The filter device 13 is used to perform spectroscopic processing on the light emitted by the light source 12 to obtain a spectrum with at least one wavelength corresponding to the gas to be measured. The spectrum is transmitted to the photodetector array 14 through a corresponding set optical path, wherein the set optical path passes through the gas entering the gas chamber 11 through the air inlet 111.

[0032] The photodetector array 14 is used to perform photoelectric conversion processing on the received spectrum to obtain an electrical signal.

[0033] The detection module 15 is used to detect the concentration information of the gas to be detected in the gas chamber 11 according to the electrical signal.

[0034] The gas to be tested in this embodiment can be one or more gases, which is not limited here.

[0035] In one embodiment of the present disclosure, Figure 2 As shown, the gas detection device 10 may include a circuit board 18 , and the detection module 15 may be disposed on the circuit board 18 .

[0036] Furthermore, the light source 12, the filter device 13, and the photodetector array 14 are all located in the air chamber 11. The inner surface of the air chamber 11 (except for the positions where the air inlet 111, the light source 12, and the photodetector array 14 are arranged) is a light path surface.

[0037] Furthermore, the light source 12 and the photodetector array 14 may be disposed on a circuit board 18 .

[0038] In this embodiment, the optical filter device 13 may be an optical filter or a diffraction grating.

[0039] This embodiment realizes light splitting of the light source through a grating or a filter, which can make the filter device small in size and easy to integrate.

[0040] A filter is an optical filter that removes unwanted spectral components from incident light.

[0041] A diffraction grating is a type of grating. It uses a regular structure to periodically modulate the amplitude or phase (or both) of the incident light. A diffraction grating can disperse polychromatic light and form a spectrum through single-slit diffraction and multi-slit interference. At the same time, spectrum is formed because spectral lines of different wavelengths appear at different positions.

[0042] In this embodiment, the wavelength of the spectrum corresponding to the gas to be measured can be determined as the target wavelength, and the filter device 13 is set according to the target wavelength to obtain the spectrum of the target wavelength. For example, the target wavelength corresponding to carbon dioxide can be 4.26um. The wavelength of the spectrum corresponding to a gas to be measured can be one or more, which is not limited here.

[0043] Furthermore, when there is only one gas to be measured and one wavelength corresponding to the gas to be measured, a single spectrum filter can be selected as the filter device; when there are multiple gases to be measured, or when there is only one gas to be measured and multiple wavelengths corresponding to the gas to be measured, a multi-spectrum diffraction grating can be selected as the filter device.

[0044] When the optical filter device 13 is a diffraction grating, it can be configured so that only a spectrum of a target wavelength can be transmitted to the photodetector array 14 through a corresponding set optical path.

[0045] The spectrum may pass through the gas in the gas chamber 11 during the transmission through the corresponding set optical path. The gas in the gas chamber 11 is the gas in the surrounding environment of the gas detection device 10, and the gas in the environment may enter the gas chamber 11 through the air inlet 111. Therefore, the concentration information of the gas to be measured in the gas chamber 11 obtained in this embodiment is the concentration information of the gas to be measured in the surrounding environment of the gas detection device 10.

[0046] In one embodiment of the present disclosure, the filter device 13 is disposed at a position close to the light source 12 .

[0047] In this embodiment, the light source 12 may be an infrared light source, a wide-spectrum black body light source, or a light emitting diode (LED).

[0048] In this embodiment, the filter device 13 is disposed at a position close to the light source 12 , and specifically, the filter device 13 may be disposed above the light source 12 . In this embodiment, the above is relative to the transmission direction of the light.

[0049] Through this embodiment, the accuracy of gas concentration detection results can be improved.

[0050] In one embodiment of the present disclosure, the detection module 15 may include an operational amplifier 151, an analog-to-digital converter 152 and a processor 153. The operational amplifier 151 is used to amplify the electrical signal output by the photodetector array 14, the analog-to-digital converter 152 is used to perform analog-to-digital conversion on the electrical signal output by the operational amplifier 151, and the processor 153 is used to process the digital electrical signal according to an algorithm to obtain the concentration information of the gas to be measured.

[0051] In one embodiment of the present disclosure, Figure 2 As shown, the set optical path includes a first optical path 16 and a second optical path 17, the first end of the first optical path 16 is connected to the filter device 13, the first end of the second optical path 17 is connected to the photodetector array 14, and the second end of the first optical path 16 and the second end of the second optical path 17 are arranged opposite to each other near the air inlet 111.

[0052] In this embodiment, the first optical path 16 and the second optical path 17 can be formed by the inner wall of the air chamber 11 (which is also the reflective surface of the optical path). Specifically, the optical design can be performed according to the distribution of the spectrum so that the light beam is transmitted along a predetermined route (i.e., the set optical path).

[0053] In this embodiment, the gas in the gas chamber 11 is located between the second end of the first optical path 16 and the second end of the second optical path 17 .

[0054] Through the set optical path composed of the first optical path and the second optical path, the corresponding spectrum can be transmitted through the set optical path and the gas in the gas chamber to the photodetector array, thereby realizing accurate transmission and positioning of the spectrum.

[0055] In one embodiment of the present disclosure, the photodetector array 14 includes a photodetector corresponding to each spectrum one by one, and each spectrum is transmitted to the corresponding photodetector through a corresponding set optical path.

[0056] When the spectrum corresponding to the gas to be measured is a multi-spectrum, the photodetector array 14 is a photodetector array composed of multiple photodetectors. When the spectrum corresponding to the gas to be measured is a single spectrum, the photodetector array 14 is a photodetector array composed of one photodetector.

[0057] The photodetector array in this embodiment may be a photodiode array, a thermopile array, a pyroelectric array, or a photon counter array.

[0058] In this embodiment, the response times of the light source 12 and the photodetector match. If the response times do not match, the gas detection device may work abnormally.

[0059] The spectrum received by each photodetector in the photodetector array 14 is the spectrum obtained after the corresponding gas to be measured absorbs the energy of the corresponding spectrum. Therefore, the processing module 15 can obtain the electrical signal obtained by photoelectric conversion of the received spectrum by each photodetector, that is, the concentration information of the corresponding gas to be measured can be obtained.

[0060] In one embodiment, in an embodiment where the spectrum corresponding to the gas to be detected is a multi-spectrum, the gas detection device may be provided with set optical paths and photoelectric detectors corresponding to each spectrum one by one, the first end of each set optical path may be connected to a filter device, and the second end of each set optical path may be connected to a corresponding photoelectric detector, so that any spectrum can be transmitted to the corresponding photoelectric detector through the corresponding set optical path.

[0061] Furthermore, the structure of each set optical path may be the same or different, which is not limited here.

[0062] In another embodiment, the gas detection device may have only one set optical path. In an embodiment where the spectrum corresponding to the gas to be detected is a multi-spectrum, the gas detection device may be provided with a photoelectric detector corresponding to each spectrum, and each spectrum may be transmitted to the corresponding photoelectric detector through the set optical path.

[0063] Through this embodiment, the concentrations of multiple gases can be detected simultaneously and synchronously.

[0064] In one embodiment of the present disclosure, the gas detection device 10 further includes a focusing reflector cup corresponding to each photodetector one by one, each focusing reflector cup is arranged above the corresponding photodetector, and each photodetector receives the corresponding spectrum through the corresponding focusing reflector cup.

[0065] Through this embodiment, by providing a focusing reflector cup, it can be ensured that the spectrum can effectively and accurately reach the corresponding photoelectric detector.

[0066] In one embodiment of the present disclosure, there are at least two types of gases to be tested, and the detection module 15 is used to perform mutual verification based on concentration information of the at least two gases to be tested.

[0067] In this embodiment, the detection module can use an algorithm to verify the concentration information of at least two gases to be tested with reference to each other, thereby reducing or even eliminating cross interference between the gases.

[0068] In one embodiment of the present disclosure, Figure 3 As shown, the gas detection device 10 further includes an environmental sensor 19, which is used to detect environmental data in the gas chamber; the detection module 15 is also used to detect the concentration information of the gas to be detected in the gas chamber according to the environmental data.

[0069] Under different environments, the gas to be tested has different degrees of absorption of the spectrum. Therefore, the detection module detects the concentration information of the gas to be tested in the gas chamber based on environmental data and electrical signals, which can reduce the impact of environmental factors on the detection results and thus improve the accuracy of the detection results.

[0070] In one embodiment of the present disclosure, the environmental sensor includes at least one or more of a temperature sensor, a humidity sensor, and an air pressure sensor.

[0071] In one example, the environmental sensor 19 may be disposed on the circuit board 18 .

[0072] In one embodiment of the present disclosure, Figure 3 As shown, the gas detection device 10 also includes a filtering circuit 21, a driving circuit 22, and a power supply (not shown in the figure). The driving circuit 21 can be used to drive the light source to emit light, the power supply is used to power the gas detection device, and the filtering circuit 22 is used to filter the electrical signal output by the photodetector array 14.

[0073] Furthermore, the filter circuit 21 , the drive circuit 22 , and the power supply are all arranged on the circuit board 18 .

[0074] In the embodiment of the present disclosure, the light emitted by the light source 12 is filtered or split by a filter or a grating to obtain a spectrum with at least one wavelength corresponding to the gas to be measured; the spectrum is accurately transmitted through a set optical path to reach the photodetector array 14 and realize photoelectric conversion, converting light energy into electrical energy. The electrical signal is filtered by the filter circuit on the circuit board and amplified by the operational amplifier, and is sent to the processor for signal processing, and environmental data is compensated to obtain the concentration information of the gas to be measured.

[0075] The gas in the environment enters the gas chamber through the air inlet. When there is a gas to be tested in the environment, it will absorb the energy of the corresponding spectrum, and the spectrum reaching the photodetector will be attenuated accordingly. Based on Beer's law, the concentration information of each gas to be tested in the environment can be accurately calculated according to the changes in the electrical signal and the environmental data.

[0076] Through the embodiments of the present disclosure, the concentration information of a single gas to be tested can be accurately detected, and the concentration information of multiple gases to be tested can also be detected simultaneously, realizing the function of a gas analyzer, and the device has a small size, is easy to integrate, and has little cross-interference between gases.

[0077] <Sensor Embodiment>

[0078] This embodiment provides a gas detection sensor, which may include the gas detection device described in any embodiment of the present disclosure.

[0079] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0080] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

[0081] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0082] The computer program instructions for performing the operation of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages, such as Smalltalk, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present invention.

[0083] Various aspects of the present invention are described herein with reference to the flow charts and / or block diagrams of the methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each box of the flow chart and / or block diagram and the combination of each box in the flow chart and / or block diagram can be implemented by computer-readable program instructions.

[0084] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0085] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operating steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0086] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a part of a module, a program segment or an instruction, and a part of the module, a program segment or an instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0087] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A gas detection device, characterized in that: It comprises an air chamber with an air inlet, a light source, a filter device, a photodetector array and a detection module, wherein the light source, the filter device and the photodetector array are all arranged in the air chamber; The optical filter device is used to perform spectroscopic processing on the light emitted by the light source to obtain a spectrum with at least one wavelength corresponding to the gas to be measured, and the spectrum is transmitted to the photodetector array through a corresponding set optical path, wherein the set optical path passes through the gas entering the gas chamber through the air inlet hole; The photodetector array is used to perform photoelectric conversion processing on the received spectrum to obtain an electrical signal; The detection module is used to detect the concentration information of the gas to be detected in the gas chamber according to the electrical signal.

2. The gas detection device according to claim 1, characterized in that: The optical filter device is a bandpass filter or a diffraction grating.

3. The gas detection device according to claim 1, characterized in that: The set optical path includes a first optical path and a second optical path, the first end of the first optical path is connected to the filter device, the first end of the second optical path is connected to the photodetector array, and the second end of the first optical path and the second end of the second optical path are arranged opposite to each other near the air inlet.

4. The gas detection device according to claim 1, characterized in that: The photodetector array includes a photodetector corresponding to each spectrum one by one, and each spectrum is transmitted to the corresponding photodetector through a corresponding set optical path.

5. The gas detection device according to claim 4, characterized in that: The gas detection device also includes a focusing reflector cup corresponding to each photoelectric detector one by one, each focusing reflector cup is arranged above the corresponding photoelectric detector, and each photoelectric detector receives the corresponding spectrum through the corresponding focusing reflector cup.

6. The gas detection device according to claim 1, characterized in that: There are at least two types of the gases to be tested, and the detection module is used to perform mutual verification based on concentration information of the at least two gases to be tested.

7. The gas detection device according to claim 1, characterized in that: The gas detection device further comprises an environmental sensor, and the environmental sensor is used to detect environmental data in the gas chamber; the detection module is further used to detect concentration information of the gas to be detected in the gas chamber according to the environmental data.

8. The gas detection device according to claim 7, characterized in that: The environmental sensor includes at least one or more of a temperature sensor, a humidity sensor, and an air pressure sensor.

9. The gas detection device according to claim 1, characterized in that: The optical filter device is arranged at a position close to the light source.

10. A gas detection sensor, characterized in that: The invention comprises a gas detection device as claimed in any one of claims 1 to 9.

Images