CN115219453B - Method for determining light spot pattern formed in multi-reflecting chamber and multi-reflecting chamber - Google Patents

Method for determining light spot pattern formed in multi-reflecting chamber and multi-reflecting chamber Download PDF

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CN115219453B
CN115219453B CN202210852543.0A CN202210852543A CN115219453B CN 115219453 B CN115219453 B CN 115219453B CN 202210852543 A CN202210852543 A CN 202210852543A CN 115219453 B CN115219453 B CN 115219453B
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mirror
rectangular concave
mirror surface
distance
spot pattern
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CN115219453A (en
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孔榕
周欣
刘鹏
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Beijing Normal University
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Beijing Normal University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment

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  • General Health & Medical Sciences (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract

The invention discloses a method for determining a light spot pattern formed in a multi-reflection air chamber and the multi-reflection air chamber, wherein the method comprises the following steps: establishing an optical model of the multi-reflection air chamber based on the mirror surface parameters; defining the distance between the first mirror surface and the second mirror surface as a first distance, and constructing a first distance array for the first distance; defining the distance between the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the joint of the plurality of rectangular concave mirrors as a second distance, and constructing a second distance array for the second distance; setting light rays to enter from a preset incident point coordinate for each first distance value and each second distance value, and determining a light spot pattern formed by the light rays on a mirror surface according to an optical model; selecting a light spot pattern which accords with a preset shape and has a light spot interval within a preset light spot interval range as a candidate light spot pattern; and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.

Description

Method for determining light spot pattern formed in multi-reflecting chamber and multi-reflecting chamber
Technical Field
The invention relates to the technical field of spectrum detection, in particular to a method for determining a light spot pattern formed in a multi-reflection air chamber, the multi-reflection air chamber and computing equipment.
Background
The optical multi-reflection air chamber is widely applied to Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology, and can realize a longer optical path in a relatively smaller volume, so that the detection sensitivity is improved, and the detection limit is reduced. The optical multi-reflection air chamber needs to finely adjust the mirror surface in the air chamber so as to ensure that the light beam enters the multi-reflection air chamber through the incident hole and is emitted from the emergent hole after specific back and forth reflection times. According to Lambert-Beer law, the acting distance between light and a sample is increased, the amplitude of an absorption signal can be increased, so that the spectrum detection sensitivity can be effectively improved, and multiple reflections are an effective way for realizing a long optical path. In the fields of scientific research, environmental protection, coal mine gas monitoring and the like, a light spectrum absorption method is used for analyzing and detecting trace gases such as methane, carbon monoxide, oxygen and the like.
In the prior art, the common multi-reflection air chamber is as follows: white chambers, herriott chambers, chernin chambers, discrete mirror chambers, and annular chambers. The White type multi-reflection air chamber can realize the multi-reflection of the light beam in the multi-reflection air chamber, but the design of the White type multi-reflection air chamber has certain defects such as overlarge volume, poor stability, low effective utilization rate of a mirror surface and the like, and limits the application range of the White air chamber. The Chernin type multi-reflection air chamber is an improved optical multi-reflection air chamber based on a White type multi-reflection air chamber, and can change the absorption optical path at any time according to the needs, but has a complex structure and a large volume, so that the application of the Chernin type multi-reflection air chamber in the requirements of miniaturized instruments is limited. The Herriott air chamber is formed by coaxially and symmetrically forming two identical spherical mirrors, and reflection light spots of light rays on the mirrors show a single circular or elliptical pattern, so that the utilization rate of the area of the cavity mirrors is not high. The multi-reflecting chamber of the discrete lens overcomes the defects of the Herriott multi-reflecting chamber, improves the utilization rate of the area of the cavity lens, and can form the light spot distribution of Lissajous figures on the lens surface, but the processing cost of the discrete lens is higher, and the yield is low. The annular air chamber is formed by a single annular mirror surface, and the effective optical path of the air chamber can be changed by adjusting the incident angle of light rays, but the requirement on the incident angle precision is very high.
According to Lambert-Beer law, the amplitude of the absorption signal is in direct proportion to the acting distance between light and a sample, so that the range and the sensitivity of spectrum detection can be adjusted by changing the optical path of the multi-reflection air chamber; the reduction of the volume of the multi-reflection air chamber can promote the development of the portable sensor and improve the speed of gas detection.
Therefore, a method for determining the light spot pattern formed in the multi-reflection air chamber is needed, so that the designed multi-reflection air chamber has smaller volume, the optical path can be adjusted according to the actual detection requirement, and the detection sensitivity is improved.
Disclosure of Invention
To this end, the present invention provides a method of determining the pattern of spots formed in a multi-reflector chamber to solve or at least alleviate the above-identified problems.
According to one aspect of the present invention, there is provided a method of determining a pattern of light spots formed in a multi-reflecting chamber, the multi-reflecting chamber including first and second mirrors having identical mirror parameters and symmetrically arranged, the first and second mirrors each including a plurality of rectangular concave mirrors spliced to each other, light rays being adapted to be incident from any one of the rectangular concave mirrors and sequentially traverse each of the rectangular concave mirrors and to be emitted after being reflected between the first and second mirrors a plurality of times, the light rays being adapted to form a pattern of light spots of the same shape on each of the rectangular concave mirrors of the first and second mirrors, the method comprising: determining mirror parameters of the first mirror surface and the second mirror surface, and establishing an optical model of the multi-reflection air chamber based on the mirror parameters; defining the distance between the first mirror surface and the second mirror surface as a first distance, setting the range of the first distance, and constructing a first distance array for the first distance based on a first distance interval; defining a projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction, and setting the distance between the projection point and the spliced position of the plurality of rectangular concave mirrors as a second distance, setting the range of the second distance, and constructing a second distance array for the second distance based on a second distance interval; setting light to be incident from a preset incident point coordinate for each first distance value in the first distance array and each second distance value in the second distance array, and determining a light spot pattern formed by the light on each rectangular concave mirror of the first mirror surface and the second mirror surface according to the optical model; selecting a light spot pattern which accords with a preset shape and has a light spot interval within a preset light spot interval range as a candidate light spot pattern, and generating a candidate light spot pattern set based on all the candidate light spot patterns; and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.
Optionally, in the method for determining a spot pattern formed in a multi-reflection air chamber according to the present invention, setting light to be incident from a predetermined incident point coordinate includes: constructing an incident angle array based on a predetermined angle interval; the light is set to be incident from the preset incident point at each incident angle in the incident angle array.
Optionally, in the method for determining a spot pattern formed in a multi-reflection air chamber according to the present invention, setting light to be incident from a predetermined incident point coordinate includes: constructing a predetermined incident point coordinate array based on the predetermined coordinate difference value; light is set to be incident from a predetermined incident point based on each predetermined incident point coordinate in the predetermined incident point coordinate array.
Optionally, in the method for determining a light spot pattern formed in the multi-reflection air chamber according to the present invention, determining a light spot pattern formed by light on each rectangular concave mirror of the first mirror surface and the second mirror surface according to the optical model includes: and determining the path of the light rays in the multi-reflection chamber according to the optical model, wherein the path information comprises each light spot formed by the light rays on each rectangular concave mirror.
Optionally, in the method for determining a spot pattern formed in a multi-reflection chamber according to the present invention, the path information further includes coordinates of an exit point of the light ray, and selecting, as the candidate spot pattern, a spot pattern conforming to a predetermined shape and having a spot pitch within a predetermined spot pitch range includes: and selecting the light spot patterns which accord with the preset shape, the light spot distance is in the preset light spot distance range, and the coordinates of the emergent point are the same as the coordinates of the preset incident point as the candidate light spot patterns.
Alternatively, in the method of determining a spot pattern formed in a multi-reflection air chamber according to the present invention, the predetermined shape includes a line shape or an ellipse shape, and the candidate spot pattern includes a line shape spot pattern or an ellipse shape spot pattern.
Alternatively, in the method of determining a spot pattern formed in a multi-reflection air chamber according to the present invention, the predetermined shape includes a combined shape including a shape of a multi-line combination, a shape of a combination of a line shape and an ellipse shape; the candidate spot patterns include a multi-line shaped combined spot pattern, a line-shaped and an oval-shaped combined spot pattern.
Optionally, in the method for determining a light spot pattern formed in a multi-reflection air chamber according to the present invention, the plurality of mutually spliced rectangular concave mirrors are arranged side by side or circumferentially.
Optionally, in the method for determining a light spot pattern formed in the multi-reflection chamber according to the present invention, the first mirror surface and the second mirror surface respectively include two rectangular concave mirrors spliced to each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are spliced with each other; the projection point of the curvature center of the first rectangular concave mirror on the mirror surface along the optical axis direction and the distance between the projection point and the joint of the two rectangular concave mirrors are second distances; the second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced, the mirror surface parameters of the second rectangular concave mirror and the mirror surface parameters of the first rectangular concave mirror are the same and are symmetrically arranged, and the mirror surface parameters of the fourth rectangular concave mirror and the mirror surface parameters of the third rectangular concave mirror are the same and are symmetrically arranged.
Alternatively, in the method of determining a spot pattern formed in a multi-reflecting chamber according to the present invention, when the radius of curvature R of the rectangular concave mirror is 100mm, the first distance d is in the range of 10 mm.ltoreq.d.ltoreq.200 mm, and the first distance interval is 0.1mm; the range of the second distance c is more than or equal to 0 and less than or equal to 3mm, and the second distance interval is 0.01mm.
According to one aspect of the present invention, there is provided a multi-reflecting chamber comprising a first mirror and a second mirror having identical mirror parameters and being symmetrically arranged, wherein: the first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are spliced with each other, wherein at least one rectangular concave mirror is provided with an inlet hole; the light rays incident through the incidence holes are suitable for traversing each rectangular concave mirror in sequence and are emitted after being reflected between the first mirror surface and the second mirror surface for multiple times, and the light rays are suitable for forming a light spot pattern with a preset shape on each rectangular concave mirror of the first mirror surface and the second mirror surface.
Alternatively, in the multi-reflecting chamber according to the present invention, the plurality of rectangular concave mirrors that are mutually spliced are arranged side by side or circumferentially.
Optionally, in the multi-reflection air chamber according to the present invention, the first mirror surface and the second mirror surface respectively include two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are mutually spliced, the second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced, the mirror surface parameters of the second rectangular concave mirror and the mirror surface parameters of the first rectangular concave mirror are identical and symmetrically arranged, and the mirror surface parameters of the fourth rectangular concave mirror and the mirror surface parameters of the third rectangular concave mirror are identical and symmetrically arranged.
Alternatively, in the multi-turn air chamber according to the present invention, the predetermined shape is a line shape or an oval shape.
Alternatively, in the multi-reflection air chamber according to the present invention, the predetermined shape includes a combination shape including a shape of a combination of a multi-line shape, a shape of a combination of a line shape and an oval shape.
Optionally, in the multi-reflection air chamber according to the present invention, the first mirror surface and the second mirror surface are provided with a plurality of incident holes; the multi-beam laser is suitable for being incident from a plurality of incident holes, traversing each rectangular concave mirror in sequence, reflecting for a plurality of times between the first mirror surface and the second mirror surface and then emitting, and forming a combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface; wherein each laser is adapted to detect a gas, respectively.
Optionally, in the multi-reflection air chamber according to the present invention, the combined light spot pattern includes an X-shaped light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming X-shaped light spot patterns on each rectangular concave mirror of the first mirror surface and the second mirror surface.
Optionally, in the multi-reflection air chamber according to the present invention, the combined light spot pattern includes a linear and an elliptical combined light spot patterns, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming a linear and elliptic combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
According to one aspect of the present invention, there is provided a computing device comprising: at least one processor; and a memory storing program instructions, wherein the program instructions are configured to be adapted to be executed by the at least one processor, the program instructions comprising instructions for performing the method as described above.
According to one aspect of the present invention, there is provided a readable storage medium storing program instructions that, when read and executed by a computing device, cause the computing device to perform a method as described above.
According to the method for determining the spot patterns formed in the multi-reflection air chamber, an optical model of the multi-reflection air chamber is built based on mirror parameters of a first mirror surface and a second mirror surface, a first distance array is built based on a first distance interval for the distance between the first mirror surface and the second mirror surface, and a second distance array is built based on a second distance interval for the distance between the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the joint of the plurality of rectangular concave mirrors. And setting light rays to be incident from the preset incidence point coordinates for each first distance value in the first distance array and each second distance value in the second distance array, and determining the light spot patterns formed by the light rays on each rectangular concave mirror of the first mirror surface and the second mirror surface according to the optical model. In this way, a plurality of spot patterns which can be formed in the multi-reflection gas chamber can be determined, the spot patterns which conform to the preset shape and have the spot pitches within the preset spot pitch range are selected as the candidate spot patterns, a candidate spot pattern set is generated based on all the candidate spot patterns, and the optical path corresponding to each candidate spot pattern can also be determined according to the optical model. In the practical application process, the required optical path condition can be determined according to the detection sensitivity required during gas detection, and the optimal light spot pattern is selected from all the candidate light spot patterns according to the required optical path condition, so that the detection sensitivity and the detection accuracy are improved, and the detection requirements of different application scenes are met.
Further, the multi-reflection air chamber designed by the method for determining the light spot pattern formed in the multi-reflection air chamber comprises a plurality of mutually spliced rectangular concave mirrors on each side, and the volume is small and compact. Therefore, the multi-reflection air chamber is more convenient to carry in practical application, and more convenient detection of the air can be realized. And moreover, the designed multi-reflection air chamber can realize that light rays sequentially traverse each rectangular concave mirror in the multi-reflection air chamber and form a longer optical path after being reflected for multiple times on the premise of ensuring the transmission stability of an optical path, so that the sensitivity and the accuracy of gas detection based on laser absorption spectrum are improved. According to different arrangement modes of the multi-reflection air chamber, such as side-by-side arrangement, surrounding arrangement and the like, measurement requirements of different application scenes can be met.
Further, according to the multi-reflecting chamber of the present invention, by making a plurality of laser lights for detecting a plurality of gases incident to the multi-reflecting chamber, the plurality of laser lights are emitted after being reflected between the mirror surfaces on both sides a plurality of times, and a combined spot pattern is formed on the mirror surfaces on both sides. Therefore, the synchronous detection of multiple gases in the multi-reflecting gas chamber with smaller volume can be realized through multiple laser beams, and the utilization rate of the multi-reflecting gas chamber and the detection efficiency of the gases are improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which set forth the various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to fall within the scope of the claimed subject matter. The above, as well as additional objects, features, and advantages of the present disclosure will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. Like reference numerals generally refer to like parts or elements throughout the present disclosure.
FIG. 1 illustrates a block diagram of a computing device 100, according to one embodiment of the invention;
FIG. 2a shows a schematic structural view of a multi-turn plenum 200 according to one embodiment of the invention;
FIG. 2b shows a schematic projection of a rectangular concave mirror according to one embodiment of the invention;
FIG. 3 illustrates a flow diagram of a method 300 of determining a pattern of spots formed in a multi-reflector chamber according to one embodiment of the invention;
Fig. 4 shows a schematic view of forming a linear spot pattern on a first mirror (a first rectangular concave mirror M1 and a third rectangular concave mirror M3) according to one embodiment of the invention;
fig. 5 shows a schematic view of forming an elliptical spot pattern on a first mirror (first rectangular concave mirror M1 and third rectangular concave mirror M3) and a second mirror (second rectangular concave mirror M2 and fourth rectangular concave mirror M4) according to an embodiment of the present invention;
FIG. 6 is a schematic view showing a rotated spot pattern formed by rotating the linear spot pattern shown in FIG. 4 clockwise and counterclockwise by a predetermined angle about the center of a mirror surface where the linear spot pattern is located, respectively;
FIG. 7 shows a schematic diagram of forming a combined spot pattern (linear spot pattern and elliptical spot pattern combination) on each rectangular concave mirror of a first mirror and a second mirror according to one embodiment of the invention;
fig. 8 and 9 respectively show schematic diagrams of a plurality of rectangular concave mirror surrounding arrangements according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an aspect of the present invention, the method 300 of determining a pattern of spots formed within a multi-reflector chamber is performed with a computing device by creating an optical model of the multi-reflector chamber in the computing device. The method comprises the steps of determining light spot patterns formed on two side mirrors of a multi-reflection chamber according to an optical model by setting the distance between the two side mirrors (a first mirror and a second mirror) of the multi-reflection chamber and the incidence condition of light, and selecting the light spot patterns meeting the preset condition as candidate light spot patterns. In practical application, the required optical path condition can be determined according to the detection sensitivity required during gas detection, and the optimal light spot pattern is selected from all the candidate light spot patterns according to the required optical path condition, so that the detection requirements of different application scenes are met. One example of a computing device is first shown below.
FIG. 1 illustrates a block diagram of a computing device 100, according to one embodiment of the invention.
As shown in FIG. 1, in a basic configuration 102, a computing device 100 typically includes a system memory 106 and one or more processors 104. The memory bus 108 may be used for communication between the processor 104 and the system memory 106.
Depending on the desired configuration, the processor 104 may be any type of processing including, but not limited to: a microprocessor (μp), a microcontroller (μc), a digital information processor (DSP), or any combination thereof. The processor 104 may include one or more levels of caches, such as a first level cache 110 and a second level cache 112, a processor core 114, and registers 116. The example processor core 114 may include an Arithmetic Logic Unit (ALU), a Floating Point Unit (FPU), a digital signal processing core (DSP core), or any combination thereof. The example memory controller 118 may be used with the processor 104, or in some implementations, the memory controller 118 may be an internal part of the processor 104.
Depending on the desired configuration, system memory 106 may be any type of memory including, but not limited to: volatile memory (such as RAM), non-volatile memory (such as ROM, flash memory, etc.), or any combination thereof. The system memory 106 may include an operating system 120, one or more applications 122, and program data 124. In some implementations, the application 122 may be arranged to execute instructions on an operating system by the one or more processors 104 using the program data 124.
Computing device 100 may also include an interface bus 140 that facilitates communication from various interface devices (e.g., output devices 142, peripheral interfaces 144, and communication devices 146) to basic configuration 102 via bus/interface controller 130. The example output device 142 includes a graphics processing unit 148 and an audio processing unit 150. They may be configured to facilitate communication with various external devices such as a display or speakers via one or more a/V ports 152. Example peripheral interfaces 144 may include a serial interface controller 154 and a parallel interface controller 156, which may be configured to facilitate communication with external devices such as input devices (e.g., keyboard, mouse, pen, voice input device, touch input device) or other peripherals (e.g., printer, scanner, etc.) via one or more I/O ports 158. An example communication device 146 may include a network controller 160, which may be arranged to facilitate communication with one or more other computing devices 162 via one or more communication ports 164 over a network communication link.
The network communication link may be one example of a communication medium. Communication media may typically be embodied by computer readable instructions, data structures, program modules, and may include any information delivery media in a modulated data signal, such as a carrier wave or other transport mechanism. A "modulated data signal" may be a signal that has one or more of its data set or changed in such a manner as to encode information in the signal. By way of non-limiting example, communication media may include wired media such as a wired network or special purpose network, and wireless media such as acoustic, radio Frequency (RF), microwave, infrared (IR) or other wireless media. The term computer readable media as used herein may include both storage media and communication media.
Computing device 100 may be implemented as a personal computer including desktop and notebook computer configurations. Of course, computing device 100 may also be implemented as part of a small-sized portable (or mobile) electronic device such as a cellular telephone, a digital camera, a Personal Digital Assistant (PDA), a personal media player device, a wireless web-watch device, a personal headset device, an application-specific device, or a hybrid device that may include any of the above functions. And may even be implemented as servers, such as file servers, database servers, application servers, WEB servers, and the like. The embodiments of the present invention are not limited in this regard.
In an embodiment according to the invention, the computing device 100 is configured to perform a method 300 of determining a spot pattern formed within a multi-reflector chamber according to the invention. Wherein the application 122 of the computing device 100 contains a plurality of program instructions for performing the method 300 of determining a pattern of spots formed in a multi-reflector chamber according to the present invention.
It should be noted that, in the method 300 for determining a light spot pattern formed in the multi-reflection air chamber of the present invention, an optical model is established according to parameters of the first mirror and the second mirror in the multi-reflection air chamber, and a path of the light ray is traced based on the optical model, so as to determine the light spot patterns formed on the first mirror and the second mirror by the light ray.
In which fig. 2a shows a schematic structural view of a multi-turn air chamber 200 according to an embodiment of the present invention.
As shown in fig. 2a, the multi-turn air chamber 200 includes a first mirror 210 and a second mirror 220 symmetrically arranged, and the first mirror 210 and the second mirror 220 are respectively arranged at both sides of the multi-turn air chamber 200. The first mirror 210 and the second mirror 220 have the same mirror parameters, and the first mirror 210 and the second mirror 220 respectively include a plurality of rectangular concave mirrors that are mutually spliced. Here, it should be noted that the present invention does not limit the number of rectangular concave mirrors included in the two-sided mirror surfaces, and it can be set by one skilled in the art according to actual needs.
The rectangular concave mirror means a concave mirror having a rectangular projection shape. The concave mirror may be a concave spherical mirror, and the rectangular concave mirror may be a rectangular concave spherical mirror.
It can be appreciated that, based on the mirror parameters of the first mirror 210 and the second mirror 220 of the multi-turn plenum 200 being identical and symmetrically arranged, each rectangular concave mirror in the first mirror 210 is identical and symmetrically arranged with the mirror parameters of the corresponding rectangular concave mirror in the second mirror 220, respectively. The mirror surface parameters of the rectangular concave mirror specifically comprise the curvature radius of the rectangular concave mirror and the size of the rectangular concave mirror.
In an embodiment according to the invention, the side mirrors comprise a plurality of mutually spliced rectangular concave mirrors, which may be arranged side by side or circumferentially. That is, the rectangular concave mirrors on each side may be tiled together side-by-side, or may be tiled together in a circumferential manner (end-to-end).
As shown in fig. 2a, the present invention establishes a coordinate axis with the midpoint of the geometric center line of the first mirror 210 and the second mirror 220 as the origin O and the straight line of the geometric center line of the first mirror 210 and the second mirror 220 as the z-axis.
According to one embodiment of the present invention, as shown in fig. 2a, the first mirror 210 and the second mirror 220 respectively include two rectangular concave mirrors that are spliced to each other, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). In other words, the first mirror 210 and the second mirror 220 are respectively formed by two rectangular concave mirrors that are not overlapped with each other and are spliced together side by side. The heights (lengths in the y-axis direction) of the two rectangular concave mirrors that are mutually joined together are the same, and the projected shapes of the first mirror 210 and the second mirror 220 are also rectangular.
Specifically, the first mirror 210 includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 that are mutually spliced. The second mirror 220 includes a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 that are mutually spliced. The second rectangular concave mirror and the first rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
In one embodiment, the radius of curvature of each rectangular concave mirror comprised by the first mirror 210 and each rectangular concave mirror comprised by the second mirror 220 are the same. For example, the curvature radii of the first rectangular concave mirror M1, the third rectangular concave mirror M3, the second rectangular concave mirror M2, and the fourth rectangular concave mirror M4 are all R.
In one embodiment, the first mirror 210 and the second mirror 220 comprise all rectangular concave mirrors having the same mirror parameters (radius of curvature and size).
In one embodiment, each rectangular concave mirror of the first and second mirrors 210, 220 may be in a narrow strip shape, which is advantageous in reducing the volume of the multiple anti-reflection chamber 200.
In one embodiment, the radius of curvature of each rectangular concave mirror may be, for example, 100mm, wherein the size of the first rectangular concave mirror M1 (second rectangular concave mirror M2) is, for example, 50.8mm×6mm, and the size of the third rectangular concave mirror M3 (fourth rectangular concave mirror M4) is, for example, 15mm×10mm.
According to the multi-reflecting chamber 200 of the present invention, light can be incident from any rectangular concave mirror of the first mirror 210 and the second mirror 220 to the multi-reflecting chamber 200, and can traverse each rectangular concave mirror in turn, and the light can be reflected between the first mirror 210 and the second mirror 220 for multiple times and then be emitted. Finally, the light may form a spot pattern of the same shape on each rectangular concave mirror of the first mirror 210 and the second mirror 220. The spot patterns formed on the first mirror 210 and the second mirror 220 are symmetrical to each other. Here, each spot pattern comprises a plurality of spots, in particular a spot pattern consisting of a plurality of spots.
In one embodiment of the present invention, at least one rectangular concave mirror of the first mirror 210 and the second mirror 220 is provided with an entrance hole. Light may be incident into the multi-reflector cell 200 from the incident aperture. The light incident through the incident hole traverses each rectangular concave mirror in turn, and is reflected between the first mirror 210 and the second mirror 220 for multiple times and then exits. Finally, the light may form the same shaped spot pattern on each rectangular concave mirror of the first mirror 210 and the second mirror 220, and the spot patterns formed on the first mirror 210 and the second mirror 220 are symmetrical to each other.
FIG. 3 illustrates a flow diagram of a method 300 of determining a pattern of spots formed in a multi-reflector plenum 200 according to one embodiment of the invention. The method 300 is suitable for execution in a computing device, such as the aforementioned computing device 100.
It should be noted that, in the method 300 for determining a light spot pattern formed in the multi-reflection air chamber 200 according to the present invention, an optical model is established according to parameters of the first mirror 210 and the second mirror 220 in the multi-reflection air chamber 200, and a path of the light ray is traced based on the optical model, so as to determine the light spot patterns formed on the first mirror 210 and the second mirror 220 by the light ray.
As shown in fig. 3, the method 300 includes steps S310-S360.
In step S310, mirror parameters of the first mirror 210 and the second mirror 220 are determined, and an optical model of the multi-chamber 200 is created based on the mirror parameters. Here, the mirror parameters of the first mirror 210 and the second mirror 220 may specifically include: the first and second mirror surfaces 210, 220 each comprise a radius of curvature and a size of a rectangular concave mirror.
It should be noted that, according to the established optical model, the path of the light ray in the multi-reflection chamber 200 may be determined, and the path information includes each light spot formed on each rectangular concave mirror of the first mirror 210 and the second mirror 220, so that the light spot pattern formed by the light ray and the plurality of light spots formed on each rectangular concave mirror of the first mirror 210 and the second mirror 220 may be determined according to the optical model.
In step S320, a distance (mirror pitch) between the first mirror 210 and the second mirror 220 is defined as a first distance d, a range of the first distance is set, and a first distance array is constructed for the first distance based on the first distance interval. Here, it is understood that each first distance value in the constructed first distance array is within the set range of the first distance.
For example, in one embodiment, the first mirror 210 includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 that are mutually tiled. The second mirror 220 includes a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 that are mutually spliced. The second rectangular concave mirror and the first rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
In this embodiment, the distance between the first rectangular concave mirror M1 and the second rectangular concave mirror M2 is the first distance d. The distance between the third rectangular concave mirror M3 and the fourth rectangular concave mirror M4 is the first distance d.
In this embodiment, the light ray may be incident to the multi-reflector cell 200 from the first rectangular concave mirror M1 in the first mirror 210, for example, and sequentially traverse the second rectangular concave mirror m2→the third rectangular concave mirror m3→the fourth rectangular concave mirror m4→the first rectangular concave mirror M1, and then, the second traverse may be continued: second rectangular concave mirror M2→third rectangular concave mirror M3→fourth rectangular concave mirror M4→first rectangular concave mirror M1. And so on, until the light is emitted after being reflected between the first mirror 210 and the second mirror 220 for a plurality of times.
In step S330, a distance between a projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction (i.e., the thinnest part of the rectangular concave mirror) and a joint part of the plurality of rectangular concave mirrors is defined as a second distance c, a range of the second distance is set, and a second distance array is constructed for the second distance based on the second distance interval. Here, it is understood that each second distance value in the constructed second distance array is within the set second distance range.
It should be noted that, the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction is: the intersection line (the broken line shown in fig. 2 a) of the plane in which the center of the sphere of the rectangular concave mirror lies and the mirror surface of the rectangular concave mirror is also the thinnest point of the rectangular concave mirror.
Fig. 2b shows a schematic projection of a rectangular concave mirror (in the z-axis direction) according to an embodiment of the invention. As shown in fig. 2b, the rectangular concave mirror has a rectangular projection shape, and the left and right ends of the mirror surface are asymmetric. The point S' represents the projection of the center of the rectangular concave mirror along the z-axis direction, and the dotted line represents the projection point of the center of curvature of the rectangular concave mirror on the mirror surface along the optical axis direction (i.e., the z-axis direction), where the distance from the dotted line to one end of the rectangular concave mirror (the joint with the other rectangular concave mirror) is the second distance c.
For example, in one embodiment, the first mirror 210 and the second mirror 220 each include two rectangular concave mirrors that are mutually spliced, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). Then, the distance from the projection point (S') of the center of curvature of the first rectangular concave mirror (or the third rectangular concave mirror) on the mirror surface in the optical axis direction to the junction of the two rectangular concave mirrors (i.e., the junction of the first rectangular concave mirror and the third rectangular concave mirror) is the second distance c.
In one embodiment, the relationship between the first distance d and the radius of curvature R of the rectangular concave mirror is: c is more than or equal to 0 and less than or equal to 2R. When the radius of curvature R of the rectangular concave mirror is 100mm, the first distance d may be in the range of 10 mm.ltoreq.d.ltoreq.200 mm, and the first distance interval may be 0.1mm, for example. The second distance c may be, for example, 0.ltoreq.c.ltoreq.3 mm, and the second distance interval may be, for example, 0.01mm.
In step S340, for each first distance value in the first distance array and each second distance value in the second distance array, light is set to be incident from a predetermined incident point coordinate, and a light spot pattern formed by the light on each rectangular concave mirror of the first mirror 210 and the second mirror 220 is determined according to the optical model. Here, the predetermined incident point may be located on either one of the first mirror 210 or the second mirror 220, which is a rectangular concave mirror.
Specifically, the path of the light ray in the multi-reflecting chamber 200 may be determined according to the optical model, and the path information includes each of the light spots formed on each of the rectangular concave mirrors of the first mirror 210 and the second mirror 220, so that the spot pattern of the plurality of light spots finally formed on each of the rectangular concave mirrors of the first mirror 210 and the second mirror 220 may be determined according to the optical model.
In addition, the path information may further include information such as incident point coordinates, incident angle, exit point coordinates, and reflection times of the light.
In one embodiment, an incidence angle array comprising a plurality of incidence angles may be constructed for the incidence angles in order to analyze the effect on the resulting spot pattern by adjusting the incidence angle of the light rays.
Specifically, in step S340, setting that the light is incident from the predetermined incident point may be achieved according to the following method: an array of incident angles may be constructed based on the predetermined angular intervals. Further, for each first distance value in the first distance array and each second distance value in the second distance array, it is set that the light is incident from a predetermined incident point at each incident angle in the incident angle array.
Further, a predetermined incident point array including a plurality of predetermined incident points may be constructed for the predetermined incident points so as to analyze an influence on the finally formed spot pattern by adjusting the position of the predetermined incident points. Specifically, a predetermined incident point coordinate array may be constructed based on the predetermined coordinate difference value, and light is set to be incident from the predetermined incident point based on each predetermined incident point coordinate in the predetermined incident point coordinate array.
For example, in one implementation, a predetermined incident point array including a plurality of predetermined incident points may be constructed by setting a z coordinate of 0, a y coordinate of 0 to 22mm, and a predetermined coordinate difference of 0.1mm for each predetermined incident point. Here, the predetermined coordinate difference is a y coordinate difference.
In step S350, a spot pattern conforming to a predetermined shape and having a spot pitch within a predetermined spot pitch range is selected as a candidate spot pattern, and a set of candidate spot patterns is generated based on all the candidate spot patterns.
Here, the present invention is not limited to the specific shape type of the predetermined shape, and a person skilled in the art can determine the predetermined shape according to the actual detection requirement so that the light forms a spot pattern of the predetermined shape on each side mirror.
In one embodiment, the predetermined shape may be, for example, a linear shape, or a single shape such as an elliptical shape, and the single-shape spot pattern is a single-mode spot pattern. Accordingly, a linear spot pattern may be selected as the candidate spot pattern, or an elliptical spot pattern may be selected as the candidate spot pattern. The candidate spot pattern may comprise a linear spot pattern or an elliptical spot pattern.
In addition, by limiting the spot pitch to be within the predetermined spot pitch range, it is possible to ensure that the plurality of spots formed on each side of the mirror surface do not overlap with each other, and to avoid the light interference phenomenon. In one embodiment, the predetermined spot spacing range may be set to not less than 0.5mm.
In step S360, the optical path length corresponding to each candidate spot pattern is determined according to the optical model, so that the candidate spot pattern meeting the predetermined optical path length condition is selected as the optimal spot pattern.
It should be noted that the present invention is not particularly limited to the predetermined optical path conditions set herein. It should be appreciated that in practical applications, the predetermined optical path conditions may be determined and preconfigured according to the detection sensitivity required when detecting the gas. In this way, the optimal light spot patterns are selected from all the candidate light spot patterns according to the predetermined light path conditions, the incidence of light rays (laser) to the multi-reflection air chamber 200 is controlled based on the path information corresponding to the selected optimal light spot patterns, and the gas in the multi-reflection air chamber 200 is detected, so that the detection sensitivity and the detection precision can be improved, and the detection requirement of the actual application scene can be met.
In one embodiment, the predetermined optical path conditions may be implemented, for example, as: the optical path range is 2.5-10 m.
In one embodiment, the path information includes exit point coordinates of the light rays. When the re-entry condition needs to be satisfied, in step S350, a spot pattern that conforms to a predetermined shape, has a spot pitch within a predetermined spot pitch range, and has the same exit point coordinates as the predetermined entrance point coordinates may be selected as the candidate spot pattern.
It should be understood that the re-entry condition means that the exit point coordinates of the light ray are identical to the entry point coordinates, i.e. the exit point of the light ray coincides with the entry point. When the candidate light spot pattern is selected, the coordinates of the emergent point in the path are further limited to be the same as the coordinates of the preset incident point, so that the light path corresponding to the selected candidate light spot pattern can be ensured to meet the reentrant condition.
In practical application, after the optimal candidate spot pattern is selected based on the candidate spot pattern set meeting the reentrant condition, the coordinates of the incident point of the light ray and the corresponding incident hole are set based on the light ray path corresponding to the optimal candidate spot pattern, so that the light ray can be emitted from the incident hole into the multi-reflection air chamber and sequentially traverse each rectangular concave mirror, and after multiple reflections are carried out in the multi-reflection air chamber, the light ray is emitted from the original incident hole.
In an embodiment of the present invention, the optical model may be an equation that is based on an incident ray and a straight line intersecting a circle established by a spherical surface where the first mirror surface and the second mirror surface (the plurality of rectangular concave mirrors) are located. Wherein the incident light rays may be represented asWherein/>And/>The coordinates of the incident point and the incident direction vector of the ith reflection are shown. The centers of curvature of the four rectangular concave mirrors can be expressed as:
substituting the incident ray equation into the sphere equation An expression of a quadratic equation can be obtained: /(I)
Wherein a=1;
two roots can be obtained by solving the intersection equation of the straight line and the spherical surface, and larger positive roots are reserved:
Therefore, we can solve the coordinates of the incident point of the (i+1) th reflection, the normal vector, and the incident direction vector of the (i+1) th reflection, which can be represented by the following formulas (3) - (5), respectively:
According to the above iterative relationship, when And r (i+1)＝r(i), the light just passes through the original incident point position after being reflected for N times, the multi-reflection air chamber with the structure can enable the light to be injected into the multi-reflection air chamber from the incident hole and be emitted from the original incident hole, namely, the incident point coordinate and the emergent point coordinate of the light are the same, so that the multi-reflection air chamber meets the re-entry condition.
Fig. 4 shows a schematic diagram of forming a linear spot pattern on a first mirror (first rectangular concave mirror M1 and third rectangular concave mirror M3) according to an embodiment of the invention. In this embodiment, the first distance d between the first mirror and the second mirror is 141mm. The second distance c is 0.5mm.
According to the path information of the light corresponding to the linear light spot pattern in fig. 4, the reflection times are 44 times, and the coordinates of the exit point are the same as those of the incident point, that is, the exit light is emitted through the original incident hole. And the optical path length corresponding to the linear light spot pattern is 6.2m.
Fig. 5 shows a schematic diagram of forming an elliptical spot pattern on a first mirror (first rectangular concave mirror M1 and third rectangular concave mirror M3) and a second mirror (second rectangular concave mirror M2 and fourth rectangular concave mirror M4) according to an embodiment of the present invention. In this embodiment, the first distance d between the first mirror and the second mirror is 147mm. The second distance c is 1.4mm.
According to the path information of the light corresponding to the elliptical spot pattern in fig. 5, the number of reflections is 64 times, and the optical path length corresponding to the linear spot pattern is 9.4m.
According to an embodiment of the invention, the predetermined shape may be a line shape and the candidate spot pattern may include a line-shaped spot pattern. In step S350, after selecting a spot pattern conforming to a predetermined shape (line shape) and having a spot pitch within a predetermined spot pitch range as a candidate spot pattern (line shape spot pattern), for each candidate spot pattern (line shape spot pattern), the candidate spot pattern may be rotated by a predetermined angle around the center of the mirror surface in which it is located, to form a rotated line shape spot pattern. The rotated linear spot pattern may also be used as a candidate spot pattern.
For example, fig. 6 shows a schematic diagram of an X-shaped spot pattern formed by rotating the linear spot pattern shown in fig. 4 clockwise and counterclockwise by a predetermined angle around the center of a mirror surface where it is located, respectively. Here, the X-shaped spot pattern includes two linear spot patterns obtained by rotating the linear spot pattern by a predetermined angle clockwise and counterclockwise around the center of the mirror surface where it is located, respectively.
It should be noted that the structural parameters of the multi-reflection air chamber shown in fig. 6 (including the radius of curvature, the size, and the first distance between the first mirror and the second mirror) are the same as those of the multi-reflection air chamber forming the single linear light spot pattern in fig. 4. Wherein, the coordinate value of each light spot in the linear light spot pattern after rotation can be obtained according to the rotation angle (preset angle).
According to yet another embodiment of the present invention, the predetermined shape may also be a combined shape formed by combining a plurality of single shapes, and the candidate spot patterns may include combined spot patterns. For example, the combined shape may include a shape of a combination of multi-line shapes, a shape of a combination of line shapes and oval shapes. Accordingly, combining the spot patterns may include: a multi-line shaped combined light spot pattern formed by combining a plurality of linear light spot patterns, and a linear and elliptical combined light spot pattern formed by combining a linear light spot pattern and an elliptical light spot pattern. The combined light spot pattern is a multi-mode combined light spot pattern. Accordingly, in step S350, a combined spot pattern may be selected as a candidate spot pattern.
It will be appreciated that the combined spot pattern comprises an X-shaped spot pattern, which is one implementation of a multi-line combined spot pattern. The X-shaped spot pattern shown in fig. 6 is a multi-line shaped combined spot pattern formed by combining two line-shaped spot patterns.
In addition, fig. 7 shows a schematic view of forming a combined linear and elliptical spot pattern on each rectangular concave mirror of the first mirror and the second mirror according to one embodiment of the present invention. In this embodiment, the first distance d between the first mirror surface and the second mirror surface is 147mm, and the volume of the multi-reflection air chamber is 88.2cm 3, where the optical path corresponding to the linear light spot pattern is 9.4m, and the optical path corresponding to the elliptical light spot pattern is 3.1m.
According to the set of candidate spot patterns (including a plurality of spot patterns with predetermined shapes) and the optical path length corresponding to each candidate spot pattern determined by the method 300 of the present invention, a multi-reflection air chamber may be designed, where the multi-reflection air chamber includes a first mirror and a second mirror that are symmetrically arranged, and the first mirror and the second mirror are respectively arranged on two sides of the multi-reflection air chamber. The first mirror surface and the second mirror surface have the same mirror surface parameters, and the first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are mutually spliced. The light can be incident from any rectangular concave mirror of the first mirror surface and the second mirror surface to a plurality of anti-air chambers, and traverses each rectangular concave mirror in sequence, and the light can be reflected between the first mirror surface and the second mirror surface for multiple times and then is emitted. Finally, the light may form a spot pattern of the same shape and a predetermined shape on each rectangular concave mirror of the first mirror and the second mirror. And the light spot patterns formed on the first mirror surface and the second mirror surface are mutually symmetrical.
According to one embodiment of the present invention, when a plurality of laser lights are required to be incident into the multi-reflection chamber to detect a plurality of gases, a combined spot pattern conforming to the optical path conditions required for the plurality of gases may be selected from the candidate spot patterns based on the optical path conditions required for the detection of the plurality of gases, so as to control the plurality of laser lights to be incident into the multi-reflection chamber according to the path information corresponding to the combined spot pattern to detect the plurality of gases. Here, the combined spot pattern may include, for example, a multi-line-shaped combined spot pattern including an X-shaped spot pattern, a linear and an elliptical combined spot pattern. It will be appreciated that the number of single-shape spot patterns included in the combined spot pattern is determined according to the number of gas types and the number of lasers. For example, when 3 gases need to be detected, 3 laser beams need to be injected into the multi-reflector chamber, and accordingly, the combined spot pattern contains 3 single-shape spot patterns.
It should be noted that, according to the optical model, path information such as an incident point, an incident angle and the like corresponding to each single-shape light spot pattern in the combined light spot patterns can be determined, so that each beam of laser can be controlled to be respectively incident into the multi-reflection chamber from one of the incident points at a corresponding incident angle, so that corresponding gases are detected through each beam of laser, and synchronous detection of multiple gases is realized.
Specifically, based on the coordinates of the incident point corresponding to each single-shape light spot pattern in the selected combined light spot patterns, the incident holes are formed at the corresponding positions on the corresponding rectangular concave mirror in the first mirror surface or the second mirror surface of the actual multi-reflection air chamber, so that each laser beam is respectively emitted into the multi-reflection air chamber from the corresponding incident hole. Further, it is necessary to ensure that the spot formed on the first mirror surface and the second mirror surface per laser beam does not overlap with all the incident holes, so as to prevent light from being emitted from any one of the incident holes during reflection.
That is, according to the multi-reflecting chamber of one embodiment, a plurality of entrance holes may be provided on the first mirror surface and the second mirror surface of the multi-reflecting chamber. When multiple lasers are needed to detect multiple gases in the multi-reflecting gas chamber, the multiple lasers can be controlled to respectively enter from multiple incident holes and sequentially traverse each rectangular concave mirror, each laser is reflected between the first mirror surface and the second mirror surface for multiple times and then is emitted, and each laser is respectively used for detecting one gas. Finally, the multiple lasers may form a combined spot pattern on each rectangular concave mirror of the first mirror and the second mirror. Each beam of laser forms a single-shape light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface respectively, and a plurality of single-shape light spot patterns formed by a plurality of beams of laser are combined to form a final combined light spot pattern.
Thus, according to the multi-reflection air chamber, synchronous detection of multiple gases can be realized by multiple laser beams in the multi-reflection air chamber with smaller volume.
In one implementation, as shown in fig. 2a, the first mirror surface and the second mirror surface of the multi-reflection air chamber respectively include two rectangular concave mirrors that are spliced with each other, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). Specifically, the first mirror surface includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 that are mutually spliced. The second mirror surface comprises a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 which are spliced with each other. The second rectangular concave mirror and the first rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are identical in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
According to the multi-reflection air chamber in this embodiment, when two laser beams are required to be incident into the multi-reflection air chamber to detect two kinds of air, a combined spot pattern conforming to the optical path conditions required for the two kinds of air can be selected from the candidate spot patterns based on the optical path conditions required for the detection of the two kinds of air, so that the two laser beams are controlled to be incident into the multi-reflection air chamber according to the path information corresponding to the combined spot pattern to detect the two kinds of air.
It should be noted that, when the optical path conditions required for the two gases are the same, the combined spot pattern selected from the candidate spot patterns may be an X-shaped spot pattern, as shown in fig. 6. When the two gases require different detection sensitivities and detection ranges, and the required optical path conditions are different, the combined spot pattern selected from the candidate spot patterns may be a linear and elliptical combined spot pattern, as shown in fig. 7.
In one implementation, as shown in fig. 6, in order to facilitate placement of two sets of lasers and detectors, an incident hole may be formed at a corresponding position on a first mirror surface and a second mirror surface of an actual multi-reflection air chamber, so that two laser beams are respectively incident into the multi-reflection air chamber from two incident holes on the first mirror surface and the second mirror surface, based on incident point coordinates corresponding to two linear light spot patterns in the selected X-shaped light spot patterns. For example, a first entrance hole may be formed at a corresponding position on the first rectangular concave mirror M1 of the first mirror surface of the multi-reflection chamber, and a second entrance hole may be formed at a corresponding position on the fourth rectangular concave mirror M4 of the second mirror surface.
That is, according to the multi-reflection air chamber of this embodiment, the first and second mirror surfaces of the multi-reflection air chamber are provided with the first and second inlet holes, respectively. When two kinds of gases in the multi-reflection air chamber are required to be detected by two laser beams, the two laser beams can be controlled to respectively enter from the first incident hole and the second incident hole and sequentially traverse each rectangular concave mirror, each laser beam is reflected between the first mirror surface and the second mirror surface for multiple times and then is emitted, and each laser beam is respectively used for detecting one kind of gas. Finally, as shown in fig. 6, two laser beams may form an X-shaped spot pattern on each rectangular concave mirror of the first mirror and the second mirror (fig. 6 shows only the second rectangular concave mirror M2 and the fourth rectangular concave mirror M4 of the second mirror). Wherein each laser beam forms a linear light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface respectively.
In this embodiment, the first distance between the first mirror and the second mirror is 141mm, for example, and the volume of the multi-reflecting chamber is only 81.2cm 3. Wherein, the two laser beams can respectively form an optical path of 6.2 m. Therefore, according to the multi-reflection air chamber, synchronous detection of two gases can be realized in a smaller volume.
In one implementation, when the two gases require different detection sensitivities and detection ranges, the required optical path conditions are different, the combined spot pattern selected from the candidate spot patterns may be a linear and elliptical combined spot pattern, as shown in fig. 7. Based on the incidence point coordinates corresponding to the linear light spot patterns and the elliptic light spot patterns in the selected linear and elliptic combined light spot patterns, in order to facilitate placement of the two groups of lasers and the detectors, an incidence hole can be formed at the corresponding positions on the first mirror surface and the second mirror surface of the actual multi-reflection air chamber, so that two laser beams are respectively injected into the multi-reflection air chamber from the two incidence holes on the first mirror surface and the second mirror surface.
That is, according to the multi-reflection air chamber of this embodiment, the first and second mirror surfaces of the multi-reflection air chamber are provided with the first and second inlet holes, respectively. When two kinds of gases in the multi-reflection air chamber are required to be detected by two laser beams, the two laser beams can be controlled to respectively enter from the first incident hole and the second incident hole and sequentially traverse each rectangular concave mirror, each laser beam is reflected between the first mirror surface and the second mirror surface for multiple times and then is emitted, and each laser beam is respectively used for detecting one kind of gas. Finally, as shown in fig. 7, two lasers may form a combined linear and elliptical spot pattern on each rectangular concave mirror of the first and second mirrors. One laser beam forms a linear light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface, and the other laser beam forms an elliptic light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
In this embodiment, the first distance d between the first mirror surface and the second mirror surface is 147mm, and the volume of the multi-reflection air chamber is 88.2cm 3, where the optical path corresponding to the linear light spot pattern is 9.4m, and the optical path corresponding to the elliptical light spot pattern is 3.1m.
Fig. 8 and 9 respectively show schematic diagrams of a plurality of rectangular concave mirror surrounding arrangements according to an embodiment of the present invention. As shown in fig. 8 and 9, a plurality of mutually spliced rectangular concave mirrors included in the first mirror surface and the second mirror surface may be circumferentially arranged. That is, the plurality of rectangular concave mirrors on each side can be tiled together in a circumferential fashion (end-to-end). By increasing the number of rectangular concave mirrors, the kind of the measured gas and the detection range and detection accuracy can be increased. The number of the rectangular concave mirrors in the multi-reflection air chamber and the corresponding optical path, measurement range and precision can be adjusted according to actual measurement requirements.
The invention provides a method for determining a light spot pattern formed in a multi-reflection air chamber, wherein an optical model of the multi-reflection air chamber is established based on mirror parameters of a first mirror surface and a second mirror surface, and a first distance array is established for the distance between the first mirror surface and the second mirror surface based on a first distance interval. And based on the second distance interval, a second distance array is constructed for the distance between the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the joint of the plurality of rectangular concave mirrors. And setting light rays to be incident from the preset incidence point coordinates for each first distance value in the first distance array and each second distance value in the second distance array, and determining the light spot patterns formed by the light rays on each rectangular concave mirror of the first mirror surface and the second mirror surface according to the optical model. In this way, a plurality of spot patterns which can be formed in the multi-reflection gas chamber can be determined, the spot patterns which conform to the preset shape and have the spot pitches within the preset spot pitch range are selected as the candidate spot patterns, a candidate spot pattern set is generated based on all the candidate spot patterns, and the optical path corresponding to each candidate spot pattern can also be determined according to the optical model. In the practical application process, the required optical path condition can be determined according to the detection sensitivity required during gas detection, and the optimal light spot pattern is selected from all the candidate light spot patterns according to the required optical path condition, so that the detection sensitivity and the detection accuracy are improved, and the detection requirements of different application scenes are met.
Further, the multi-reflection air chamber designed by the method for determining the light spot pattern formed in the multi-reflection air chamber comprises a plurality of mutually spliced rectangular concave mirrors on each side, and the volume is small and compact. Therefore, the multi-reflection air chamber is more convenient to carry in practical application, and more convenient detection of the air can be realized. And moreover, the designed multi-reflection air chamber can realize that light rays sequentially traverse each rectangular concave mirror in the multi-reflection air chamber and form a longer optical path after being reflected for multiple times on the premise of ensuring the transmission stability of an optical path, so that the sensitivity and the accuracy of gas detection based on laser absorption spectrum are improved. According to different arrangement modes of the multi-reflection air chamber, such as side-by-side arrangement, surrounding arrangement and the like, measurement requirements of different application scenes can be met.
Further, according to the multi-reflecting chamber of the present invention, by making a plurality of laser lights for detecting a plurality of gases incident to the multi-reflecting chamber, the plurality of laser lights are emitted after being reflected between the mirror surfaces on both sides a plurality of times, and a combined spot pattern is formed on the mirror surfaces on both sides. Therefore, the synchronous detection of multiple gases in the multi-reflecting gas chamber with smaller volume can be realized through multiple laser beams, and the utilization rate of the multi-reflecting gas chamber and the detection efficiency of the gases are improved.
A8, the method of any of A1-A7, wherein the mutually tiled plurality of rectangular concave mirrors are arranged side-by-side or circumferentially.
A9, the method of any of A1-A8, wherein the first mirror surface and the second mirror surface respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are spliced with each other; the projection point of the curvature center of the first rectangular concave mirror on the mirror surface along the optical axis direction and the distance between the projection point and the joint of the two rectangular concave mirrors are second distances; the second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced, the mirror surface parameters of the second rectangular concave mirror and the mirror surface parameters of the first rectangular concave mirror are the same and are symmetrically arranged, and the mirror surface parameters of the fourth rectangular concave mirror and the mirror surface parameters of the third rectangular concave mirror are the same and are symmetrically arranged.
A10, the method of any one of A1-A9, wherein when the curvature radius R of the rectangular concave mirror is 100mm, the first distance d is in the range of 10mm less than or equal to d less than or equal to 200mm, and the first distance interval is 0.1mm; the range of the second distance c is more than or equal to 0 and less than or equal to 3mm, and the second distance interval is 0.01mm.
A12, the multi-reflection air chamber of A11, wherein the mutually spliced plurality of rectangular concave mirrors are arranged side by side or arranged in a surrounding manner.
A13, the multi-reflection air chamber as set forth in A11 or A12, wherein the first mirror surface and the second mirror surface respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are mutually spliced, the second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced, the mirror surface parameters of the second rectangular concave mirror and the mirror surface parameters of the first rectangular concave mirror are identical and symmetrically arranged, and the mirror surface parameters of the fourth rectangular concave mirror and the mirror surface parameters of the third rectangular concave mirror are identical and symmetrically arranged.
A14, the multiple-reflection air chamber of any of a11-a13, wherein the predetermined shape is a line shape or an ellipse shape.
A15, the method of any of a11-a13, wherein the predetermined shape comprises a combined shape comprising a multi-line combined shape, a line-shaped and oval-shaped combined shape.
A16, the multi-reflection air chamber of any one of a11-a15, wherein a plurality of inlet holes are arranged on the first mirror surface and the second mirror surface; the multi-beam laser is suitable for being incident from a plurality of incident holes, traversing each rectangular concave mirror in sequence, reflecting for a plurality of times between the first mirror surface and the second mirror surface and then emitting, and forming a combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface; wherein each laser is adapted to detect a gas, respectively.
A17, the multi-reflection air chamber of A16, wherein the combined light spot pattern comprises an X-shaped light spot pattern, and a first incident hole and a second incident hole are respectively arranged on the first mirror surface and the second mirror surface; the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming X-shaped light spot patterns on each rectangular concave mirror of the first mirror surface and the second mirror surface.
A18, the multi-reflection air chamber of A16, wherein the combined light spot pattern comprises a linear combined light spot pattern and an elliptical combined light spot pattern, and a first incident hole and a second incident hole are respectively arranged on the first mirror surface and the second mirror surface; the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming a linear and elliptic combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
The various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present invention, or certain aspects or portions of the methods and apparatus of the present invention, may take the form of program code (i.e., instructions) embodied in tangible media, such as removable hard drives, U-drives, floppy diskettes, CD-ROMs, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the invention.
In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to perform the data storage method and/or the data query method of the present invention in accordance with instructions in said program code stored in the memory.
By way of example, and not limitation, readable media comprise readable storage media and communication media. The readable storage medium stores information such as computer readable instructions, data structures, program modules, or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of readable media.
In the description provided herein, algorithms and displays are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with examples of the invention. The required structure for a construction of such a system is apparent from the description above. In addition, the present invention is not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into a plurality of sub-modules.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
Furthermore, some of the embodiments are described herein as methods or combinations of method elements that may be implemented by a processor of a computer system or by other means of performing the functions. Thus, a processor with the necessary instructions for implementing the described method or method element forms a means for implementing the method or method element. Furthermore, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is for carrying out the functions performed by the elements for the purpose of carrying out the invention.
As used herein, unless otherwise specified the use of the ordinal terms "first," "second," "third," etc., to describe a general object merely denote different instances of like objects, and are not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.

Claims (20)

1. A method of determining a pattern of light spots formed within a multi-turn plenum, the multi-turn plenum comprising first and second mirrors of identical mirror parameters and symmetrically arranged, the first and second mirrors each comprising a plurality of rectangular concave mirrors that are mutually stitched, light rays adapted to be incident from any one of the rectangular concave mirrors and to traverse each of the rectangular concave mirrors in turn and to be emitted after multiple reflections between the first and second mirrors, the light rays adapted to form a pattern of light spots of identical shape on each of the rectangular concave mirrors of the first and second mirrors, the method comprising:
determining mirror parameters of the first mirror surface and the second mirror surface, and establishing an optical model of the multi-reflection air chamber based on the mirror parameters;
Defining the distance between the first mirror surface and the second mirror surface as a first distance, setting the range of the first distance, and constructing a first distance array for the first distance based on a first distance interval;
defining a projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction, and setting the distance between the projection point and the spliced position of the plurality of rectangular concave mirrors as a second distance, setting the range of the second distance, and constructing a second distance array for the second distance based on a second distance interval;
setting light to be incident from a preset incident point coordinate for each first distance value in the first distance array and each second distance value in the second distance array, and determining a light spot pattern formed by the light on each rectangular concave mirror of the first mirror surface and the second mirror surface according to the optical model;
Selecting a light spot pattern which accords with a preset shape and has a light spot interval within a preset light spot interval range as a candidate light spot pattern, and generating a candidate light spot pattern set based on all the candidate light spot patterns;
and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.
2. The method of claim 1, wherein setting the light ray to be incident from the predetermined point of incidence coordinate comprises:
constructing an incident angle array based on a predetermined angle interval;
The light is set to be incident from the preset incident point at each incident angle in the incident angle array.
3. The method of claim 1, wherein setting the light ray to be incident from the predetermined point of incidence coordinate comprises:
constructing a predetermined incident point coordinate array based on the predetermined coordinate difference value;
Light is set to be incident from a predetermined incident point based on each predetermined incident point coordinate in the predetermined incident point coordinate array.
4. A method according to any one of claims 1-3, wherein determining a spot pattern of light on each rectangular concave mirror of the first and second mirrors from the optical model comprises:
and determining the path of the light rays in the multi-reflection chamber according to the optical model, wherein the path information comprises each light spot formed by the light rays on each rectangular concave mirror.
5. The method of claim 4, wherein the path information further includes exit point coordinates of the light ray, selecting a spot pattern conforming to a predetermined shape and having a spot pitch within a predetermined spot pitch range as a candidate spot pattern, comprising:
And selecting the light spot patterns which accord with the preset shape, the light spot distance is in the preset light spot distance range, and the coordinates of the emergent point are the same as the coordinates of the preset incident point as the candidate light spot patterns.
6. The method of any one of claim 1 to 3, wherein,
The predetermined shape comprises a line shape or an ellipse shape, and the candidate spot pattern comprises a line shape spot pattern or an ellipse shape spot pattern.
7. The method of any one of claim 1 to 3, wherein,
The predetermined shape includes a combined shape including a shape of a combination of a multi-line shape, a shape of a combination of a line shape and an oval shape;
the candidate spot patterns include a multi-line shaped combined spot pattern, a line-shaped and an oval-shaped combined spot pattern.
8. A method according to any one of claims 1-3, wherein the mutually tiled plurality of rectangular concave mirrors are arranged side by side or circumferentially.
9. A method according to any one of claims 1-3, wherein the first and second mirror surfaces each comprise two rectangular concave mirrors that are mutually tiled, the two rectangular concave mirrors being arranged side by side;
the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are spliced with each other;
The projection point of the curvature center of the first rectangular concave mirror on the mirror surface along the optical axis direction and the distance between the projection point and the joint of the two rectangular concave mirrors are second distances;
the second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced,
The second rectangular concave mirror and the first rectangular concave mirror have the same mirror parameters and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror have the same mirror parameters and are symmetrically arranged.
10. The method of any one of claim 1 to 3, wherein,
When the curvature radius R of the rectangular concave mirror is 100mm, the range of the first distance d is more than or equal to 10mm and less than or equal to 200mm, and the first distance interval is 0.1mm;
The range of the second distance c is more than or equal to 0 and less than or equal to 3mm, and the second distance interval is 0.01mm.
11. A multi-turn plenum comprising first and second mirrors of identical mirror parameters and symmetrically arranged, wherein:
The first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are spliced with each other, wherein at least one rectangular concave mirror is provided with an inlet hole;
the light rays incident through the incidence holes are suitable for traversing each rectangular concave mirror in sequence and are emitted after being reflected between the first mirror surface and the second mirror surface for multiple times, and the light rays are suitable for forming a light spot pattern with a preset shape on each rectangular concave mirror of the first mirror surface and the second mirror surface.
12. The multiple anti-replay chamber of claim 11, wherein said plurality of mutually tiled rectangular concave mirrors are arranged side-by-side or circumferentially.
13. The multi-turn plenum of claim 11, wherein the first and second mirror surfaces each comprise two rectangular concave mirrors that are mutually spliced, the two rectangular concave mirrors being arranged side-by-side;
wherein the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are mutually spliced,
The second mirror surface comprises a second rectangular concave mirror and a fourth rectangular concave mirror which are mutually spliced,
The second rectangular concave mirror and the first rectangular concave mirror have the same mirror parameters and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror have the same mirror parameters and are symmetrically arranged.
14. The multiple reflection air chamber according to any one of claims 11 to 13, wherein the predetermined shape is a line shape or an oval shape.
15. The multiple counter chamber of any one of claims 11-13, wherein,
The predetermined shape includes a combined shape including a shape of a combination of a multi-line shape, a shape of a combination of a line shape and an oval shape.
16. The multiple reflection air chamber according to any one of claims 11 to 13, wherein the first mirror surface and the second mirror surface are provided with a plurality of entrance holes;
The multi-beam laser is suitable for being incident from a plurality of incident holes, traversing each rectangular concave mirror in sequence, reflecting for a plurality of times between the first mirror surface and the second mirror surface and then emitting, and forming a combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface;
wherein each laser is adapted to detect a gas, respectively.
17. The multi-reflection air chamber of claim 16, wherein the combined light spot pattern comprises an X-shaped light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first entrance hole and a second entrance hole;
the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming X-shaped light spot patterns on each rectangular concave mirror of the first mirror surface and the second mirror surface.
18. The multi-reflection air chamber of claim 16, wherein the combined light spot pattern comprises a linear and elliptical combined light spot pattern, and the first mirror and the second mirror are respectively provided with a first entrance hole and a second entrance hole;
The two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole, traversing each rectangular concave mirror in sequence, reflecting for multiple times between the first mirror surface and the second mirror surface and then emitting, and are suitable for forming a linear and elliptic combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
19. A computing device, comprising:
At least one processor; and
A memory storing program instructions, wherein the program instructions are configured to be adapted to be executed by the at least one processor, the program instructions comprising instructions for performing the method of any of claims 1-10.
20. A readable storage medium storing program instructions which, when read and executed by a computing device, cause the computing device to perform the method of any of claims 1-10.
CN202210852543.0A 2022-07-19 2022-07-19 Method for determining light spot pattern formed in multi-reflecting chamber and multi-reflecting chamber Active CN115219453B (en)

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