CN115219424A - Multi-reflector chamber and method for determining matrix type light spot formed in multi-reflector chamber - Google Patents

Multi-reflector chamber and method for determining matrix type light spot formed in multi-reflector chamber Download PDF

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CN115219424A
CN115219424A CN202210804247.3A CN202210804247A CN115219424A CN 115219424 A CN115219424 A CN 115219424A CN 202210804247 A CN202210804247 A CN 202210804247A CN 115219424 A CN115219424 A CN 115219424A
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mirror
rectangular concave
curvature
concave mirror
center
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周欣
肖向君
师米云
邱晶晶
欧雪
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
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • 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
    • G01N21/17—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
    • G01N2021/391—Intracavity sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • G01N2201/068—Optics, miscellaneous

Abstract

The invention discloses a multi-reflecting-chamber and a method for determining matrix-type light spots formed in the multi-reflecting-chamber, wherein the multi-reflecting-chamber comprises a first mirror surface and a second mirror surface which are symmetrically arranged, and the method comprises the following steps: the first mirror surface and the second mirror surface respectively comprise a preset number of non-overlapping rectangular concave mirrors; the first mirror surface or the second mirror surface is provided with an incident hole, light rays incident through the incident hole are suitable for being emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the light rays are suitable for forming mutually symmetrical matrix-type light spots on the first mirror surface and the second mirror surface. According to the technical scheme of the invention, the area of the mirror surface of the multi-reflection chamber can be fully utilized by forming the matrix type light spot pattern, the optical path volume is higher, and the distance between the mirror surfaces at two sides is larger, so that the larger optical path can be realized by fewer reflection times.

Description

Multi-reflector chamber and method for determining matrix type light spot formed in multi-reflector chamber
Technical Field
The invention relates to the technical field of trace gas monitoring, in particular to a multi-reflection chamber and a method for determining matrix-type light spots formed in the multi-reflection chamber.
Background
The high-precision real-time online measurement technology of the trace gas has wide application prospect in the fields of environmental pollution monitoring, atmospheric chemistry, ecological protection and the like. The optical cavity ring-down spectroscopy (CRDS) and the off-axis integral cavity output spectroscopy (OA-ICOS) developed in recent years are used as important trace gas spectrum measurement methods and have the advantages of high sensitivity, high time resolution and the like, but the technology needs an optical reflector with extremely high reflectivity, so that the defects of high cost, high technical implementation difficulty, poor environmental robustness and the like are caused.
Tunable laser absorption spectroscopy (TDLAS) has the advantages of high accuracy, high responsiveness, high selectivity, good environmental suitability, etc., and has been successfully applied to numerous industries and fields such as environmental monitoring, industrial process control, petrochemical engineering, etc. The multiple reflection air chamber is a key core device for effectively improving the optical path by the TDLAS technology, and the TDLAS technology combined with the long-optical-path multiple reflection air chamber is expected to overcome the defects of the CRDS and OA-ICOS technologies and becomes an important means for low-cost and high-precision trace gas monitoring.
An ideal long-optical-path multiple-reflection gas chamber suitable for trace gas multi-component monitoring has the following characteristics: 1. the optical path is long and can reach more than hundreds of meters; 2. the light spot distribution has obvious regularity, is easy to distinguish and has high utilization rate of the reflecting mirror surface; 3. the optical performance is good, and the beam quality is good; 4. the cost is low, the light path adjustment is simple, and the device has high reliability, high stability and better environmental adaptability; 5. and multi-component simultaneous measurement can be realized, and the optical path can be adjusted. Therefore, the design and optimization of the high-performance long-optical-path multi-reflection gas chamber are significant challenges for realizing low-cost and high-precision real-time monitoring of the trace gas.
The design of the multi-reflection gas chamber is one of the research hotspots of the TDLAS technology. The multi-reflection air chamber researched at present is based on a classical Herriott type air chamber and is formed by coaxially and symmetrically arranging spherical mirrors with the same curvature radius on two surfaces, light spots are distributed in an elliptical shape or a circular shape, the light spots are integrally dispersed on the edges of the mirror surfaces, the utilization rate of the mirror surfaces is low, and the optical path volume ratio of the air chamber is small. In order to overcome the defects, researchers adopt a toric mirror to replace a spherical mirror to form a Lissajous figure, the utilization rate of the mirror surface and the optical path volume ratio are increased, but the defects that an astigmatic mirror is high in manufacturing cost, poor in regularity of light spots and difficult in determination of the optical path exist. In addition, researchers design intensive light spot patterns such as concentric circles and independent circles based on Herriott spherical mirrors, although the utilization rate of the mirror surface of the multiple reflection air chamber is improved, light spots are not uniformly distributed and are located on the periphery of the spherical mirrors, paraxial approximate assumptions are often not met, simulation analysis on light spot deformation is needed in the design process, the process is complicated, the distance between the two spherical mirrors is small, the common design optical path is in a range of tens of meters, the multiple reflection air chamber is only suitable for manufacturing small portable air chamber devices, and long optical paths of more than hundreds of meters are difficult to achieve.
Therefore, a multi-reflective-chamber and a method for determining formation of a matrix-type light spot in the multi-reflective-chamber are needed to solve the above problems.
Disclosure of Invention
To this end, the present invention provides a multiple-reaction chamber and a method for determining formation of a matrix-type light spot in the multiple-reaction chamber to solve or at least alleviate the above-mentioned problems.
According to one aspect of the present invention, there is provided a multiple gas reflection chamber comprising a first mirror and a second mirror arranged symmetrically, wherein: the first mirror surface and the second mirror surface respectively comprise a preset number of non-overlapping rectangular concave mirrors; the first mirror surface or the second mirror surface is provided with an incident hole, light rays incident through the incident hole are suitable for being emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the light rays are suitable for forming mutually symmetrical matrix-type light spots on the first mirror surface and the second mirror surface.
Alternatively, in the multiple gas reflection chamber according to the present invention, the predetermined number isAn amount of 3; the first mirror surface comprises a first rectangular concave mirror, a second rectangular concave mirror and a third rectangular concave mirror which are spliced with each other, wherein a first curvature center (C) of the first rectangular concave mirror 1 ) A third center of curvature (C) of the third concave mirror 3 ) Collinear; the second mirror includes: the fourth rectangular concave mirror and the first rectangular concave mirror are same in mirror surface parameter and are symmetrically arranged; the fifth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameter and are symmetrically arranged; and the sixth rectangular concave mirror and the third rectangular concave mirror are the same in mirror surface parameter and are symmetrically arranged.
Optionally, in the multiple gas reflection chamber according to the invention, said first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) On a line in a first direction; the first direction pitch of the matrix type spot is the first curvature center (C) 1 ) And a third center of curvature (C) 3 ) 2 times the first directional distance; a second directional pitch of the matrix-type light spot is the second center of curvature (C) 2 ) And a first center of curvature (C) 1 ) 2 times the second directional distance of (a); the first direction is a vertical direction or a horizontal direction, and the second direction is perpendicular to the first direction.
Alternatively, in the multiple gas reflection chamber according to the present invention, when the first direction is a vertical direction, the second curvature center (C) is 2 ) And a first center of curvature (C) 1 ) The second direction distance of (a) is:
Figure BDA0003735904400000021
wherein L represents the second center of curvature (C) 2 ) And a first center of curvature (C) 1 ) M represents the number of rows of said matrix-type spot, d l A first direction pitch representing the matrix type of light spots; when the first direction is a horizontal direction, the second curvature center (C) 2 ) And a first center of curvature (C) 1 ) The second direction distance of (a) is:
Figure BDA0003735904400000022
wherein L represents the sameSecond center of curvature (C) 2 ) And a first center of curvature (C) 1 ) N represents the number of columns of the matrix type light spots, d c Representing a first directional pitch of the matrix-type spots.
Optionally, in the multi-gas reflecting chamber according to the present invention, the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror are sequentially spliced; the height of the first rectangular concave mirror is equal to the sum of the heights of the second rectangular concave mirror and the third rectangular concave mirror, and the lengths of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same; the first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) Is positioned on a straight line in the vertical direction.
Optionally, in the multi-gas reflecting chamber according to the present invention, the first rectangular concave mirror is spliced with the second rectangular concave mirror and the third rectangular concave mirror respectively; the length of the first rectangular concave mirror is equal to the sum of the lengths of the second rectangular concave mirror and the third rectangular concave mirror, and the heights of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same; the first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) Is positioned on a straight line in the horizontal direction.
Optionally, in the multiple gas reflecting chamber according to the present invention, the matrix light spots include a plurality of light spots arranged in m rows and n columns; wherein m is more than or equal to 4, m is an even number, and n is a positive integer.
Optionally, in the multi-gas-reflecting chamber according to the present invention, the matrix-type light spot includes a plurality of light spots arranged in m rows and n columns; wherein m is more than or equal to 2, m is an even number, and n is a positive integer.
Alternatively, in the multiple gas reflection chamber according to the present invention, the entrance hole is provided on the second rectangular concave mirror or the fifth rectangular concave mirror.
Optionally, in the multi-gas-reflecting chamber according to the present invention, a plurality of entrance holes are provided on the second rectangular concave mirror and/or the fifth rectangular concave mirror; the multiple gas-reflecting chambers are suitable for injecting a plurality of laser beams, and each laser beam is respectively suitable for detecting one gas; the laser beams are suitable for being incident through a plurality of incidence holes and being emitted after being reflected for a plurality of times between the first mirror surface and the second mirror surface, and a plurality of groups of non-overlapping matrix-type light spots are formed on the first mirror surface and the second mirror surface.
Optionally, in the multiple gas reaction chamber according to the present invention, the predetermined number is 4; the first mirror surface comprises a first rectangular concave mirror, a second rectangular concave mirror, a third rectangular concave mirror and a fourth rectangular concave mirror which are spliced with each other, wherein a second curvature center of the second rectangular concave mirror and a fourth curvature center of the fourth concave mirror are collinear in the vertical direction, and a first curvature center of the first rectangular concave mirror and a fourth curvature center of the fourth concave mirror are collinear in the horizontal direction; the second mirror includes: the fifth rectangular concave mirror and the first rectangular concave mirror have the same mirror surface parameter and are symmetrically arranged; the sixth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the seventh rectangular concave mirror and the third rectangular concave mirror have the same mirror surface parameter and are symmetrically arranged; and the eighth rectangular concave mirror and the fourth rectangular concave mirror are the same in mirror surface parameter and are symmetrically arranged.
Optionally, in the multiple gas reflection chamber according to the present invention, the rectangular concave mirrors are rectangular concave spherical mirrors, a radius of curvature of each rectangular concave mirror is the same, and the radius of curvature is equal to a distance between the first mirror surface and the second mirror surface.
Optionally, in the multiple gas reflection cell according to the present invention, the mirror parameters of the first and second mirrors are adapted to be determined using a genetic algorithm; the mirror parameters comprise the curvature center position and the size of each rectangular concave mirror contained in the first mirror surface and the second mirror surface.
Optionally, in the multiple gas reflection chamber according to the present invention, the mirror parameters of the first and second mirrors are adapted to be determined according to the following steps: randomly generating a plurality of matrix type light spot forming sequence individuals as an initial group; performing one or more iterations based on the initial population to obtain one or more generation populations; calculating the number of curvature centers corresponding to each matrix type facula forming sequence individual in each generation group so as to determine the target matrix type facula forming sequence with the number of curvature centers corresponding to the preset number; determining mirror parameters of the first and second mirrors based on the target matrix type spot formation order.
Optionally, in the multiple gas reflection chamber according to the present invention, the mirror parameters of the first and second mirrors are further adapted to be determined according to the following steps: taking the target matrix type facula forming sequence as a matrix type facula forming sequence of a second mirror surface, and taking the reversed target matrix type facula forming sequence as a matrix type facula forming sequence of a first mirror surface; determining whether the first mirror surface and the second mirror surface can be divided into a predetermined number of non-overlapping rectangular concave mirrors respectively based on the matrix-type light spot forming sequence of the first mirror surface and the second mirror surface; and if so, determining the mirror parameters and the size of each rectangular concave mirror contained in the first mirror surface and the second mirror surface.
Alternatively, in the multiple gas reflection chamber according to the present invention, the determining whether the first mirror surface and the second mirror surface can be divided into a predetermined number of rectangular concave mirrors which do not overlap with each other, respectively, includes: determining the position of a mirror surface where each light spot in the matrix type light spots is located based on the matrix type light spot forming sequence of the first mirror surface and the second mirror surface; and determining whether the first mirror surface and the second mirror surface can be divided into a predetermined number of non-overlapping rectangular concave mirrors respectively based on the position of the mirror surface where each light spot is located.
Optionally, in the multi-gas-reflecting chamber according to the invention, the predetermined number K has a value range of K ≧ 3, and K is a positive integer.
Optionally, in the multiple gas reflection chamber according to the present invention, calculating the number of curvature centers individually corresponding to each matrix type spot formation order in each generation group to determine a target matrix type spot formation order corresponding to the number of curvature centers being a predetermined number, includes: calculating the number of curvature centers corresponding to each individual in each generation of group, and judging whether the number of the curvature centers is a preset number; if the number of the curvature centers is a preset number, determining the matrix type facula forming sequence corresponding to the individual corresponding to the absolute value of the difference value as a target matrix type facula forming sequence; if the number of centers of curvature is not a predetermined number: performing cross and mutation operations on the population to obtain a next generation population; calculating the number of curvature centers corresponding to each individual in the next generation group, and judging whether the number of the curvature centers is a preset number or not; and determining the matrix type light spot forming sequence corresponding to the individuals with the preset number of the curvature centers as a target matrix type light spot forming sequence until the number of the curvature centers is determined to be the preset number.
According to an aspect of the present invention, there is provided a method of determining formation of a matrix-type spot in a multi-gas-reflector cell, as described above, performed in a computing device, the method comprising the steps of: establishing an optical model of the multi-gas-reflecting chamber based on mirror surface parameters of a first mirror surface and a second mirror surface of the multi-gas-reflecting chamber; based on the first predetermined distance interval, is a first center of curvature (C) of the first rectangular concave mirror 1 ) A third center of curvature (C) of the third rectangular concave mirror 3 ) Constructing a curvature center first direction distance array; based on the second predetermined distance interval, is a second center of curvature (C) of the second rectangular concave mirror 2 ) A first center of curvature (C) of the first rectangular concave mirror 1 ) Constructing a curvature center second direction distance array; setting the incidence of light rays from a preset incidence point for each first-direction distance value in the curvature center first-direction distance array and each second-direction distance in the curvature center second-direction distance array, and determining matrix-type light spots formed on the first mirror surface and the second mirror surface by the light rays according to the optical model; selecting the matrix type light spots of which the row number is within a preset row number range and the column number is within a preset column number range as candidate matrix type light spots, and generating a candidate matrix type light spot set based on all the candidate matrix type light spots; and determining the optical path corresponding to each candidate matrix type light spot according to the optical model so as to select the candidate matrix type light spot meeting the fixed optical path condition as the optimal matrix type light spot.
Alternatively, in the method for determining formation of a matrix-type light spot in a multi-gas-reflecting chamber according to the present invention, the step of setting incidence of light from a predetermined incidence point includes: constructing an incidence angle array based on a preset angle interval; and setting the light to be incident from the preset incidence point at each incidence angle in the incidence angle array respectively.
Alternatively, in the method for determining formation of a matrix-type light spot in a multi-gas-reflecting chamber according to the present invention, the predetermined incidence point is located on the second rectangular concave mirror or the fifth rectangular concave mirror; the step of setting the incidence of the light from the predetermined incidence point comprises: constructing a predetermined incident point coordinate array based on twice the second predetermined distance interval; and setting the incidence of the light ray from the preset incidence point based on each preset incidence point coordinate in the preset incidence point coordinate array.
Alternatively, in the method for determining formation of matrix-type light spot in multi-gas-reaction chamber according to the present invention, the first predetermined distance interval is D 1 /2, the second predetermined distance interval is D 2 /2 wherein D 1 Showing a first directional pitch, D, of said matrix type of spots 2 Representing a second directional pitch of the matrix-type spots.
According to an 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 executed by the at least one processor, the program instructions comprising instructions for performing the method as described above.
According to an aspect of the present invention, there is provided a readable storage medium storing program instructions which, when read and executed by a computing device, cause the computing device to perform the method as described above.
According to the multi-gas-reflecting chamber and the method for determining the matrix-type light spots formed in the multi-gas-reflecting chamber, the structure of the multi-gas-reflecting chamber suitable for forming the matrix-type light spots is determined by utilizing a genetic algorithm, wherein two mirror surfaces of the multi-gas-reflecting chamber are symmetrically arranged, each mirror surface comprises three mutually spliced rectangular concave mirrors, and the matrix-type light spots which are mutually symmetrical can be formed on the mirror surfaces of the two sides after light enters the multi-gas-reflecting chamber. By forming a matrix type light spot pattern, the mirror area of the multi-reflection chamber can be fully utilized, the optical path volume is high, and the distance between the mirror surfaces on the two sides is large, so that the large optical path can be realized with fewer reflection times. In addition, according to the method for determining the matrix type light spots formed in the multi-reflection gas chamber, the patterns of various matrix type light spots formed in the multi-reflection gas chamber can be determined, so that the optimal matrix type light spot pattern can be selected according to the actually required optical path condition in the actual application process.
In addition, according to the multi-gas-reflecting chamber, a plurality of laser beams are incident to the multi-gas-reflecting chamber and form a plurality of groups of non-overlapping matrix light spots, and each laser beam is used for detecting one gas, so that synchronous detection of a plurality of gases in the multi-gas-reflecting chamber can be realized, and the utilization rate of the multi-gas-reflecting chamber and the detection efficiency of the gases are improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.
FIG. 1 shows a block diagram of a computing device 100, according to one embodiment of the invention;
FIG. 2 illustrates a schematic diagram of a method 200 of determining multiple gas reflection chamber mirror parameters in accordance with one embodiment of the present invention;
FIG. 3 illustrates a schematic diagram of a sequence of spot formation in a matrix of two target matrices corresponding to two optimal solutions determined according to the method 200;
FIG. 4 shows a schematic structural view of a multiple gas reaction chamber 400 according to a first embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a multi-reflection cell 400 according to a first embodiment of the present invention forming a matrix-type light spot on a two-sided mirror;
FIG. 6 shows a schematic structural view of a multiple reaction chamber 400 according to a second embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a multi-reflection cell 400 according to a second embodiment of the present invention forming a matrix-type light spot on a two-sided mirror.
FIG. 8 illustrates a flow diagram of a method 800 of determining formation of a matrix-type spot within a multi-reflector chamber according to one embodiment of the invention;
FIG. 9 is a schematic diagram showing a plurality of matrix-type spot patterns formed on a second mirror by a multi-reflective chamber according to a first embodiment of the present invention;
FIG. 10 is a schematic diagram showing a plurality of matrix-type light spot patterns formed on a second mirror by a multi-reflective chamber according to a second embodiment of the present invention;
fig. 11 is a schematic diagram illustrating two sets of matrix-type light spots formed on two side mirrors by the multi-reflective-chamber according to the first 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 the technical scheme of the invention, the structure of a multi-reflection air chamber (multi-reflection air chamber) suitable for forming matrix type light spots is determined by utilizing a genetic algorithm, wherein two side mirror surfaces of the multi-reflection air chamber are symmetrically arranged, each side mirror surface comprises three rectangular concave mirrors which are spliced with each other, and the matrix type light spots which are mutually symmetrical can be formed on the two side mirror surfaces after light enters the multi-reflection air chamber. In addition, in the method for determining the matrix-type light spot formed in the multi-gas-reflecting chamber, the type of the matrix-type light spot formed by the multi-gas-reflecting chamber is subjected to expansibility analysis, so that the optimal matrix-type light spot pattern is selected according to actually required optical path conditions in the actual application process. An example of a computing device is first shown below.
FIG. 1 shows 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. A 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 (μ P), a microcontroller (μ C), a Digital Signal Processor (DSP), or any combination thereof. The processor 104 may include one or more levels of cache, such as a level one cache 110 and a level two 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. System memory 106 may include an operating system 120, one or more applications 122, and program data 124. In some implementations, the application 122 can be arranged to execute instructions on an operating system with program data 124 by one or more processors 104.
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 the basic configuration 102 via the 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. The example communication device 146 may include a network controller 160, which may be arranged to facilitate communications with one or more other computing devices 162 over a network communication link via one or more communication ports 164.
A 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, such as carrier waves or other transport mechanisms, in a modulated data signal. A "modulated data signal" may be a signal that has one or more of its data set or its changes 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 private-wired network, and various 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 both desktop and notebook computer configurations. Of course, computing device 100 may also be implemented as a portion of a small-form factor 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, an application specific device, or a hybrid device that include any of the above functions. And may even be implemented as a server, such as a file server, a database server, an application server, a WEB server, and so forth. The embodiments of the present invention do not limit this.
In an embodiment in accordance with the invention, the computing device 100 is configured to perform a method 200 of determining multiple gas reflection chamber mirror parameters in accordance with the invention. Among other things, application 122 of computing device 100 includes a plurality of program instructions that implement method 200 for determining multiple gas reflection chamber mirror parameters in accordance with the present invention. The computing device determines the specular parameters of a multi-gas-reflector suitable for forming a matrix-type spot by performing the method 200 of determining the specular parameters of a multi-gas-reflector of the present invention.
FIG. 2 shows a schematic diagram of a method 200 of determining multiple gas reflection chamber mirror parameters according to one embodiment of the invention.
It should be noted that, firstly, it can be determined that the multi-reflection gas chamber of the present invention is of a confocal cavity structure, and the multi-reflection gas chamber includes a first mirror and a second mirror which are symmetrically arranged. The method 200 for determining the parameters of a multi-reflector mirror in accordance with the present invention ultimately determines the mirror parameters of the first and second mirrors, and in particular, the method 200 utilizes a genetic algorithm to determine the mirror parameters of the first and second mirrors. In addition, the invention presets that the first mirror surface and the second mirror surface respectively comprise a preset number of non-overlapping rectangular concave mirrors. The mirror surface parameters of the first mirror surface and the second mirror surface determined by the genetic algorithm comprise the curvature center position of each rectangular concave mirror in the first mirror surface and the second mirror surface and the size of each rectangular concave mirror.
As shown in fig. 2, the method 200 begins at step S210.
In step S210, a plurality of matrix-type spot formation order individuals are randomly generated as an initial population, and the maximum number of iterations is determined.
Subsequently, in step S220, one or more iterations are performed to obtain one or more generation populations based on the initial population and the maximum number of iterations.
Next, in step S230, the number of curvature centers (i.e., the number of rectangular concave mirrors) individually corresponding to each matrix-type spot formation order in each generation group is calculated to determine a target matrix-type spot formation order corresponding to the predetermined number of curvature centers. Here, the matrix-type spot formation order individual corresponding to the number of curvature centers as a predetermined number is determined, and the matrix-type spot formation order corresponding to the matrix-type spot formation order individual is determined as a target matrix-type spot formation order.
Specifically, after the number of curvature centers corresponding to each matrix-type spot formation order individual in each generation group is calculated, it is determined whether the number of curvature centers is a predetermined number.
And if the number of the curvature centers is a preset number, determining the matrix type light spot forming sequence corresponding to the individual corresponding to the absolute value of the difference as a target matrix type light spot forming sequence.
If the number of the curvature centers is not the preset number, performing intersection and mutation operation on each generation group to obtain a next generation group corresponding to each generation group. And calculating the number of curvature centers corresponding to each individual in the next generation group, and judging whether the number of the curvature centers is a preset number. And determining the matrix type light spot forming sequence corresponding to the individuals with the preset number of the curvature centers as a target matrix type light spot forming sequence until the number of the curvature centers is determined to be the preset number.
Finally, in step S240, mirror parameters of the first mirror and the second mirror are determined based on the target matrix type spot formation order.
Specifically, in step S240, the target matrix-type spot formation order is first set as the matrix-type spot formation order of the second mirror surface, and the reversed target matrix-type spot formation order (the matrix-type spot formation order reversed from the target matrix-type spot formation order) is set as the matrix-type spot formation order of the first mirror surface. It should be noted that, according to the principle that the optical path is reversible, when the matrix-type light spot patterns of the first mirror surface and the second mirror surface are the same and the matrix-type light spot forming sequence is opposite, it can be determined that the first mirror surface and the second mirror surface are symmetrical to each other. Therefore, the target matrix type light spot forming sequence is reversed to be the matrix type light spot forming sequence of the other side mirror surface.
Further, based on the matrix-type spot forming order of the first mirror surface and the second mirror surface, whether the first mirror surface and the second mirror surface can be divided into a predetermined number of rectangular concave mirrors which do not overlap with each other is determined, so that the feasibility of the target matrix-type spot forming order is verified. Specifically, the position of the mirror surface where each light spot in the matrix type light spots is located can be determined based on the matrix type light spot forming sequence of the first mirror surface and the second mirror surface, that is, the rectangular concave mirror where each light spot is located can be determined. Based on the position of the mirror surface where each light spot is located, whether the first mirror surface and the second mirror surface can be divided into a predetermined number of non-overlapping rectangular concave mirrors or not can be determined.
If the first mirror surface and the second mirror surface are determined to be capable of being divided into a predetermined number of non-overlapping rectangular concave mirrors, the feasibility verification of the target matrix type light spot forming sequence is passed, and the mirror surface parameters and the size of each rectangular concave mirror included in the first mirror surface and the second mirror surface are determined, so that the mirror surface parameters of the first mirror surface and the second mirror surface are determined. In addition, if the first mirror surface and the second mirror surface cannot be divided into a predetermined number of rectangular concave mirrors which do not overlap with each other, it is described that the verification of the feasibility of the sequence of spot formation of the matrix type of the object is failed, and the result is discarded.
The determination of the mirror parameters of the first mirror and the second mirror using a genetic algorithm can be achieved according to the above steps S210 to S240. The mirror surface parameters comprise the curvature center position of each rectangular concave mirror in the first mirror surface and the second mirror surface and the size of each rectangular concave mirror.
It should be noted that the multi-reflecting-gas chamber required to be designed in the present invention is a confocal cavity structure. Under the paraxial approximation condition, the positions of continuous images formed by the confocal cavity type multiple reflecting chambers conform to the following rules: an object point near the center of curvature is collinear with the image point, and the midpoint of the object point and the image point is located at the center of curvature. If a matrix-type light spot pattern is to be formed on one side of the multi-reflector, at least 3 reflectors are required on the other side of the multi-reflector.
Based on this, the first mirror surface and the second mirror surface which are symmetrical to each other and designed in the invention at least comprise 3 rectangular concave mirrors. That is, the predetermined number is at least 3, specifically, the predetermined number K has a value range of K ≧ 3, and K is a positive integer. It should be noted, however, that the invention is not limited to a predetermined number of specific values. The specific value of the predetermined number in the practical application can be determined by a person skilled in the art according to practical requirements.
According to one embodiment of the present invention, the predetermined number may be determined to be 3. In this way, under the condition of ensuring that the matrix-type light spots can be formed on the first mirror surface and the second mirror surface of the multi-reflecting-chamber, the number of the required rectangular concave mirrors is minimum, and the cost in practical use is favorably reduced. In other embodiments, the predetermined number may be 4 or other values, for example, and the invention is not limited thereto.
In one implementation of the present invention, in steps S210 to S230, the problem may be solved by using a genetic algorithm until it is determined that the target matrix type spot formation order corresponding to | N-3| =0 is satisfied. In the formula, N represents the number of curvature centers, and the predetermined number is 3. I N-3| =0 is the optimal solution to be solved by the present invention.
Specifically, M matrix-type spot formation order individuals are randomly generated as an initial population P (0), where the first individual is P (0,j). And setting the maximum iteration number as T, and initializing an iteration number counter T =1. And entering an inner loop, and judging whether the fitness | N (t, j) -3| is equal to 0 or not by calculating the fitness | N (t, j) -3| of all the individuals in the population of the t generation. It is understood that the fitness is an absolute value of a difference between the number of curvature centers corresponding to the individual matrix-type spot forming sequences and a predetermined number. If fitness is not equal to 0, roulette may be used to select parents from the population, creating a pairing pool.
Next, a single-point ordering crossover operator can be applied to the population, with parents being crossed by the single-point ordering crossover operator to generate one or more new individuals, wherein each pair of parents is crossedProbability of fork operation is p c . Then, acting a single point mutation operator on the group, and carrying out mutation operation on the individuals by using a single point sequencing crossover operator, wherein the probability of carrying out mutation operation on each individual is p v . In this way, the next-generation population P (t + 1) can be obtained by the crossover operation and mutation operation on the population. Then, it is calculated whether the fitness of all individuals in the next generation population is equal to 0. Until an optimal solution with fitness equal to 0 is found.
If an optimal solution satisfying | N-3| =0 is not found when T > T, set T =1 and restart the iteration.
In one embodiment, the number of rows and the number of columns of the matrix-type light spots corresponding to each individual are set to be 4, the number of matrix-type light spot forming sequence individuals is set to be M =5000, and the probability of the cross operation and the mutation operation is p respectively c ＝0.5，p v And =0.3, and the maximum iteration number is set to T =50, so that two optimal solutions can be obtained, and two target matrix type light spot formation sequences corresponding to the two optimal solutions are obtained.
Fig. 3 shows schematic diagrams of two target matrix type light spot forming sequences corresponding to two optimal solutions.
As shown in fig. 3, side B corresponds to the matrix-type spot formation order on the second mirror, i.e., the target matrix-type spot formation order determined by the method 200 of the present invention; the a side corresponds to the matrix-type spot formation order on the first mirror, i.e., the target matrix-type spot formation order is reversed. It will be understood that the order of numbers from smaller to larger in the figures represents the order in which the spots are formed.
As shown in fig. 3, the straight line in the figure is a dividing line, and each side mirror surface includes two dividing lines which divide each side mirror surface into 3 rectangular concave mirrors. "x" in the drawing indicates the center of curvature of each rectangular concave mirror, wherein three "x" shown in B side in fig. 3 indicate the centers of curvature of three rectangular concave mirrors on the first mirror surface; three "x" shown in the a side represent the centers of curvature of three rectangular concave mirrors on the second mirror surface. That is, the centers of curvature of the three rectangular concave mirrors on the first mirror surface are located on the second mirror surface, and the centers of curvature of the three rectangular concave mirrors on the second mirror surface are located on the first mirror surface.
It will be appreciated that if it is desired to design a multi-reflector cell in which the first and second mirror surfaces each comprise 4 rectangular concave mirrors, the predetermined number may be determined to be 4. Accordingly, in the above steps S210 to S230, the problem may be solved by using a genetic algorithm until a predetermined number of target matrix-type spot formation orders of 4 are determined.
According to the two target matrix-type spot forming sequences corresponding to the two optimal solutions determined by the method 200, two mirror parameters and corresponding two structures of the multiple reflection chambers can be determined. Therefore, the invention designs two structures of the multi-gas reflecting chamber which are suitable for forming the matrix type light spots.
Fig. 4 illustrates a schematic structural diagram of a multi-reflection gas cell 400 according to a first embodiment of the present invention, and fig. 5 illustrates a schematic structural diagram of the multi-reflection gas cell 400 according to the first embodiment of the present invention, which forms a matrix-type light spot on a two-sided mirror surface.
Fig. 6 illustrates a schematic structural diagram of a multi-reflection gas cell 400 according to a second embodiment of the present invention, and fig. 7 illustrates a schematic structural diagram of the multi-reflection gas cell 400 according to the second embodiment of the present invention, which forms a matrix-type light spot on a two-sided mirror surface.
As shown in fig. 4 and 6, the multiple gas reflection chamber 400 includes a first mirror 410 and a second mirror 420 which are symmetrically arranged. The first mirror 410 and the second mirror 420 respectively comprise a predetermined number of non-overlapping rectangular concave mirrors. Here, the rectangular concave mirror refers to a concave mirror whose projection shape is rectangular. The concave mirror may be a concave spherical mirror, and the rectangular concave mirror may be a rectangular concave spherical mirror.
As shown in FIG. 4 and FIG. 6, the present invention uses the midpoint of the connecting line of the geometric centers of the first mirror 410 and the second mirror 420 as the origin O, and uses the straight line where the connecting line of the geometric centers of the first mirror 410 and the second mirror 420 is located as the z-axis, thereby establishing coordinate axes. In the description of the embodiments below, the vertical direction refers to the y-axis direction, and the horizontal direction refers to the x-axis direction.
According to an embodiment of the present invention, the first mirror surface 410 and the second mirror surface 420 are respectively formed by splicing a predetermined number of non-overlapping rectangular concave mirrors together, and the projection shapes (the projection shape along the z-axis direction) of the first mirror surface 410 and the second mirror surface 420 are rectangular.
It is understood that, based on the first mirror surface 410 and the second mirror surface 420 of the multi-reflector 400 being symmetrical to each other, each rectangular concave mirror in the first mirror surface 410 is symmetrical to a corresponding rectangular concave mirror in the second mirror surface 420.
According to the multiple reflection gas cell 400 of the present invention, as shown in fig. 5, the first mirror 410 or the second mirror 420 is provided with an incident hole (in), and light rays incident through the incident hole can be emitted after being reflected multiple times between the first mirror 410 and the second mirror 420, and are suitable for forming matrix-type light spots symmetrical to each other on the first mirror 410 and the second mirror 420. That is, the light forms the matrix-type light spots on the first mirror 410 and the second mirror 420, respectively, and the matrix-type light spots formed on the first mirror 410 and the second mirror 420 are symmetrical to each other.
It should be noted that the matrix-type light spots formed on the first mirror 410 and the second mirror 420 include a plurality of light spots arranged in a plurality of rows and at least one column, and the plurality of light spots are arranged in a matrix-type manner. Specifically, the projection shape of the plurality of light spots formed on the first mirror 410 and the second mirror 420 in the z-axis direction is matrix-shaped.
According to one embodiment of the invention, the predetermined number is 3.
Specifically, as shown in fig. 4 to 7, the first mirror surface 410 and the second mirror surface 420 respectively include 3 rectangular concave mirrors that do not overlap with each other. Optionally, the first mirror surface 410 and the second mirror surface 420 are mirror surfaces formed by splicing 3 non-overlapping rectangular concave mirrors together, and having a rectangular projection shape.
In this embodiment, the first mirror surface 410 includes first rectangular concave mirrors M spliced with each other 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 . Wherein the first rectangular concave mirror has a first center of curvature C 1 A third center of curvature C of the third concave mirror 3 Collinear, in other words, the first rectangular concave mirror and the third concave mirror are conjugate mirrors. Wherein the first mirror surface410 second rectangular concave mirror M 2 An entry hole (in) is provided.
Accordingly, the second mirror 420 includes a fourth rectangular concave mirror M spliced with each other 4 The fifth rectangular concave mirror M 5 A sixth rectangular concave mirror M 6 . The fourth rectangular concave mirror and the first rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the fifth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the sixth rectangular concave mirror and the third rectangular concave mirror are arranged symmetrically and have the same mirror surface parameters. And a fourth center of curvature C of the fourth rectangular concave mirror 4 A sixth center of curvature C with a sixth concave mirror 6 Collinearity, in other words, the fourth rectangular concave mirror and the sixth concave mirror are conjugate mirrors. Wherein, the fifth rectangular concave mirror M of the second mirror 420 5 An exit aperture (out) is provided.
The mirror surface parameters of the rectangular concave mirror include the center of curvature (position) of the rectangular concave mirror and the size of the rectangular concave mirror.
It should be understood that, based on the symmetry of first mirror surface 410 with second mirror surface 420 and the symmetry of each rectangular concave mirror in first mirror surface 410 with each rectangular concave mirror in second mirror surface 420, after the mirror surface parameters of first mirror surface 410 are determined, the mirror surface parameters of second mirror surface 420 are determined accordingly. The positional relationship (including the positional relationship of the center of curvature) and the dimensional relationship among the first rectangular concave mirror, the second rectangular concave mirror, and the third rectangular concave mirror in the first mirror surface 410 are also applicable to the positional relationship (including the positional relationship of the center of curvature) and the dimensional relationship among the fourth rectangular concave mirror, the fifth rectangular concave mirror, and the sixth rectangular concave mirror in the second mirror surface 420.
It should also be noted that in the embodiment of the present invention, the description regarding the mirror surface parameters, the positional relationship (including the positional relationship of the curvature centers), the dimensional relationship, and the relationship of the matrix-type spot formed on the first mirror surface 410 to each curvature center applies to the first mirror surface 410 and the first, second, and third rectangular concave mirrors thereof, to the second mirror surface 420 and the fourth, fifth, and sixth rectangular concave mirrors thereof.
According to one embodiment of the present invention, as shown in fig. 4-7, the multi-reflecting chamber of the present invention is a symmetric confocal cavity structure. Specifically, each rectangular concave mirror (including the first rectangular concave mirror M) 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 A fourth rectangular concave mirror M 4 A fifth rectangular concave mirror M 5 A sixth rectangular concave mirror M 6 ) Are all rectangular concave spherical mirrors, and the radius of curvature of each rectangular concave mirror is the same, and the radius of curvature is equal to the distance between the first mirror 410 and the second mirror 420 (the chamber length of the multi-reflector chamber). For example, the radii of curvature are both R, and the first mirror 410 and the second mirror 420 are spaced apart by R. And the focus of each rectangular concave mirror is located at the center of the chamber of the multi-gas reflecting chamber (i.e. the geometric center of the first mirror surface 410 and the second mirror surface 420, and the coordinate axis origin O).
Based on this, the center of curvature of each rectangular concave mirror of the first mirror surface 410 is located on the second mirror surface 420; the center of curvature of each rectangular concave mirror of the second mirror 420 is located on the first mirror 410. Specifically, as shown in fig. 4, the first center of curvature (C) of the first rectangular concave mirror 1 ) A second center of curvature (C) of the second rectangular concave mirror 2 ) A second curvature center (C) of the third rectangular concave mirror 3 ) Distributed over the second mirror 420. First center of curvature (C) of fourth rectangular concave mirror 4 ) A second curvature center (C) of the fifth rectangular concave mirror 5 ) A second curvature center (C) of the sixth rectangular concave mirror 6 ) Distributed over the first mirror 410.
In the embodiment of the present invention, as shown in fig. 5 and 7, the matrix-type light spot has m rows and n columns. That is, the matrix-type light spots formed by the light on the first mirror 410 and the second mirror 420 respectively include a plurality of light spots arranged in m rows and n columns, where m and n are positive integers. The line pitch (i.e. vertical pitch, y-axis pitch) of the matrix-type light spot is denoted as d l . The column pitch (i.e. horizontal pitch, x-axis pitch) of the matrix type light spot is denoted as d c 。
Thus, when the first mirror surface is410. When the second mirror 420 is exactly occupied by the respective matrix-type light spots, the overall height (length in the y-axis direction) of the first mirror 410 and the second mirror 420 is md l . The overall length (length in the x-axis direction) of the first mirror 410 and the second mirror 420 is nd c 。
According to a first embodiment, as shown in fig. 4 and 5, a first rectangular concave mirror M 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 The first mirror surfaces 410 are sequentially spliced in the vertical direction (y-axis direction), and the projection shape in the z-axis direction of the first mirror surfaces formed by the splicing is rectangular.
Wherein, the first rectangular concave mirror M 1 Is equal to the second rectangular concave mirror M 2 And a third rectangular concave mirror M 3 Is (length in the y-axis direction), and the first rectangular concave mirror M 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 Are the same (length in the x-axis direction). As shown in fig. 5, a first rectangular concave mirror M 1 Can be expressed as
Figure BDA0003735904400000131
Second rectangular concave mirror M 2 Can be expressed as d l A third rectangular concave mirror M 3 Can be expressed as
Figure BDA0003735904400000132
And, a first rectangular concave mirror M 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 The lengths along the x-axis are each denoted as nd c 。
In addition, the first center of curvature C of the first rectangular concave mirror 1 A third center of curvature C of the third rectangular concave mirror 3 Is positioned on a straight line in the vertical direction. In other words, the first center of curvature C 1 And a third center of curvature C 3 Are arranged at intervals in the vertical direction (y-axis direction).
In the first embodiment, as shown in FIG. 5, the incident hole (in) is disposed on the second rectangular concave mirror of the first mirror 410, and the light ray is incident on the second mirrorA first light spot (spot 0, denoted as B0) formed on the fourth rectangular concave mirror of the surface 420, an exit aperture (out) provided on the fifth rectangular concave mirror of the second mirror surface 420, and a center of curvature C of each rectangular concave mirror 1 ～C 6 Are respectively expressed as:
Figure BDA0003735904400000141
Figure BDA0003735904400000142
Figure BDA0003735904400000143
as can be seen from the matrix-type light spot forming sequence marked on the first mirror 410 and the second mirror 420 in fig. 5, the propagation manner of the light in the multiple reflective chambers and the process of forming the matrix-type light spot are as follows: the light rays are injected into the multi-reflector cell from the injection hole (in) of the first mirror 410 and form a first spot 0 on the second mirror 420 (i.e., the injected light rays are imaged at spot 0 of the second mirror 420). First rectangular concave mirror M based on first mirror surface 410 1 And a third rectangular concave mirror M 3 (conjugate mirror) so that the light incident through the incident hole is based on d on the second mirror surface 420 l The row spacing of (a) forms a first pair of columns of spots (corresponding to the image of the entrance aperture being continuously focused on the second mirror 420), which are sequentially referenced to spots 0,1,2,3, … m-4,m-3,m-2,m-1, identified on the second mirror 420 in fig. 5. It should be noted that the vertical pitch of the light spots and the conjugate mirror M 1 And M 3 Is related to the center-of-curvature distance (vertical distance). In one embodiment, the first rectangular concave mirror M 1 First center of curvature C of 1 And a third rectangular concave mirror M 3 Third center of curvature C 3 Has a vertical distance d l (ii) the vertical spacing (line spacing) of the spots is d l That is, the vertical direction of the light spotThe pitch (line pitch) being the first center of curvature C 1 And a third center of curvature C 3 Twice the vertical distance.
Up to the fifth rectangular concave mirror M of the second mirror 420 5 After forming the light spot M-1, the light will be reflected to the second rectangular concave mirror M of the first mirror 410 2 And a spot m is formed. The position of the spot m (which can be regarded as a new entrance aperture) is shifted in the horizontal direction by a distance d with respect to the position of the entrance aperture c That is, the horizontal direction pitch (column pitch) of the spots formed on the first mirror 410 is d c . Then, the light is emitted from the light spot M to the second mirror 420 again, and is reflected by the fourth rectangular concave mirror M of the second mirror 420 4 Forming a spot m of a second pair of columns of spots, the position of spot m being offset by a distance d in the horizontal direction with respect to spot 0 c That is, the horizontal direction pitch (column pitch) of the spots formed on the second mirror 420 is d c . The shift in spot m will cause the light that is again directed to second mirror 420 to be based on d on second mirror 420 l The line spacing of (1) forms a second pair of column light spots, which are sequentially referred to as light spots m, m +1, m +2, m +3, … m-4,2m-3,2m-2,2m-1 marked on the second mirror 420 in fig. 5. It should be noted that the fifth rectangular concave mirror M in the second mirror 420 5 After forming the light spot m-1, for the light spot forming process on the second mirror 420, the light spot will be located at the second curvature center C of the second rectangular concave mirror 2 And carrying out symmetrical offset on the symmetrical center to further form a second alignment of light spots.
It should be noted that the horizontal direction distance between the light spots and the second rectangular concave mirror M 2 And a first rectangular concave mirror M 1 Is related to the center-of-curvature distance (horizontal distance). In one embodiment, the second rectangular concave mirror M 2 Second center of curvature C 2 And a first rectangular concave mirror M 1 First center of curvature C of 1 Has a horizontal distance d c A horizontal pitch (column pitch) of the light spots is d c That is, in the x-axis direction, the horizontal direction pitch (line pitch) of the spots is the second center of curvature C 2 And a first center of curvature C 1 Twice the horizontal distance.
In addition, in order to make each row of light spots at the same height in the y-axis direction (for example, the light spot m is at the same height as the light spot 0), it is necessary to ensure the second curvature center C 2 And a first center of curvature C 1 Distance (d) in the horizontal direction of c /2) is equal to
Figure BDA0003735904400000151
In other words, when the first direction is the vertical direction, the second center of curvature C 2 And a first center of curvature C 1 The second direction distance of (a) is:
Figure BDA0003735904400000152
wherein L represents a second center of curvature C 2 And a first center of curvature C 1 M represents the number of rows of said matrix-type spot, d l Showing the first directional pitch of the matrix type of spots.
And according to the light spot forming rule, continuously forming a third pair of light spots and a fourth pair of light spots … … until the light rays are emitted from the emergent hole (out). At this time, the complete matrix-type light spots arranged in m rows and n columns are formed on the second mirror 420, and the matrix-type light spots of the same pattern are formed on the first mirror 410 according to a similar rule, wherein the formation order of the matrix-type light spots formed on the first mirror 410 and the matrix-type light spots formed on the second mirror 420 is reversed, so that the matrix-type light spots are formed symmetrically.
In the first embodiment, the range of the number m of rows of the matrix-type light spot may be m ≧ 4, and m is an even number. The number of columns n of the matrix-type light spot may be a positive integer.
In the embodiment of the present invention, the relationship between the pass number pass and the number of spots (mn) included in the matrix-type spot can be represented by the following formula: pass =2mn-1.
According to a second embodiment, as shown in fig. 6 and 7, a first rectangular concave mirror M 1 Respectively connected with the second rectangular concave mirror M 2 A third rectangular concave mirror M 3 The first mirror 410 formed by the splicing is rectangular in projection shape along the z-axis direction.
The length of the first rectangular concave mirror is equal to the sum of the lengths (the length along the x-axis direction) of the second rectangular concave mirror and the third rectangular concave mirror, and the heights (the lengths along the y-axis direction) of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same. As shown in FIG. 7, a first rectangular concave mirror M 1 The length along the x-axis can be expressed as nd c Second rectangular concave mirror M 2 The length along the x-axis can be expressed as (n-1) d c A third rectangular concave mirror M 3 Can be expressed as d c . And, a first rectangular concave mirror M 1 A second rectangular concave mirror M 2 A third rectangular concave mirror M 3 The lengths along the y-axis are each expressed as md l 。
In addition, a first center of curvature C 1 And a third center of curvature C 3 Is positioned on a straight line in the horizontal direction. In other words, the first center of curvature C 1 And a third center of curvature C 3 Arranged at intervals in the horizontal direction (x-axis direction).
In the second embodiment, as shown in fig. 7, an incident hole (in) provided on the second rectangular concave mirror of the first mirror surface 410, a first light spot (light spot 0, denoted as B0) formed by the light on the fourth rectangular concave mirror of the second mirror surface 420, an exit hole (out) provided on the fifth rectangular concave mirror of the second mirror surface 420, and a curvature center C of each rectangular concave mirror 1 ～C 6 Are respectively expressed as:
Figure BDA0003735904400000153
Figure BDA0003735904400000154
Figure BDA0003735904400000155
matrix-type light spots marked on the first mirror 410 and the second mirror 420 from FIG. 7The formation sequence can be seen in the following, the propagation of light in the multiple gas-reflecting chamber and the formation of the matrix-type light spot are as follows: the light rays are injected into the multi-reflector cell from the injection hole (in) of the first mirror 410 and form a first spot 0 on the second mirror 420 (i.e., the injected light rays are imaged at spot 0 of the second mirror 420). First rectangular concave mirror M based on first mirror surface 410 1 And a third rectangular concave mirror M 3 (conjugate mirror) so that the light incident through the incident hole is based on d on the second mirror surface 420 c The column pitch of (a) forms a first pair of line spots (corresponding to the successive focussing of the image of the entry aperture on the second mirror 420) which are distributed in the area of the positive and negative half-axes of the y-axis and are symmetrical with respect to the x-axis, as shown in figure 7. The first pair of rows of spots are formed sequentially as indicated by spots 0,1,2,3,4,5, … n-6,2n-5,2n-4,2n-3,2n-2,2n-1 on second mirror 420 in FIG. 7. Note that the horizontal direction pitch (column pitch) of the light spots and the conjugate mirror M 1 And M 3 Is related to the center-of-curvature distance (horizontal distance). In one embodiment, the first rectangular concave mirror M 1 First center of curvature C of 1 And a third rectangular concave mirror M 3 Third center of curvature C 3 Has a horizontal distance d c A horizontal pitch (column pitch) of the spots is d c That is, the horizontal direction pitch (column pitch) of the light spots is the first center of curvature C 1 And a third center of curvature C 3 Twice the horizontal distance.
Up to the fifth rectangular concave mirror M of the second mirror 420 5 After forming the light spot 2n-1, the light will be reflected to the second rectangular concave mirror M of the first mirror 410 2 And spot 2n is formed. The position of spot 2n-1 (which can be considered as a new entrance aperture) is shifted in the vertical direction with respect to the entrance aperture position by d l That is, the vertical direction pitch (line pitch) of the spots formed on the first mirror 410 is d l . Then, the light is emitted from the light spot 2n to the second mirror 420 again, and is reflected by the fourth rectangular concave mirror M of the second mirror 420 4 Forming a second pair of spots 2n, the position of spot 2n being offset by a vertical distance d with respect to spot 0 l I.e. of the light spot formed on the second mirror 420The vertical pitch (line pitch) is d l . The shift of spot 2n will cause the light that is again directed to second mirror 420 to be based on d on second mirror 420 c The row spacing of the light spots forms a second pair of row light spots, which are sequentially referred to light spots 2n,2n +1,2n +2,2n +3,2n +4,2n +5, … n-6,4n-5,4n-4,4n-3,4n-2,4n-1 marked on a second mirror 420 in FIG. 7. It should be noted that the fifth rectangular concave mirror M in the second mirror 420 5 After forming the light spot 2n-1, the light spot will be formed at the second curvature center C of the second rectangular concave mirror for the light spot forming process on the second mirror 420 2 And carrying out symmetrical offset on the symmetrical center to further form a second pair of row light spots. In one implementation, the second center of curvature C 2 Is positioned at an exit aperture (out) on the fifth rectangular concave mirror.
It should be noted that the vertical distance between the light spots and the second rectangular concave mirror M 2 And a first rectangular concave mirror M 1 Is related to the center-of-curvature distance (vertical distance). In one embodiment, the second rectangular concave mirror M 2 Second center of curvature C 2 And a first rectangular concave mirror M 1 First center of curvature C of 1 Has a vertical distance d l A vertical pitch (column pitch) of the light spots is d l That is, in the x-axis direction, the vertical direction pitch (line pitch) of the light spots is the second center of curvature C 2 And a first center of curvature C 1 Twice the vertical distance.
In addition, in this embodiment, when the first direction is the horizontal direction, the second curvature center C 2 And a first center of curvature C 1 Satisfies the following conditions:
Figure BDA0003735904400000161
wherein L represents a second center of curvature C 2 And a first center of curvature C 1 N denotes the number of columns of the matrix type of spots, d c Showing the first directional pitch of the matrix type of spots.
And according to the light spot forming rule, continuously forming a third pair of row light spots and a fourth pair of row light spots … … until the light rays are emitted from an emitting hole (out) on the fifth rectangular concave mirror. At this time, the complete matrix-type light spots arranged in m rows and n columns are formed on the second mirror 420, and the matrix-type light spots of the same pattern are also formed on the first mirror 410 according to a similar rule, wherein the formation order of the matrix-type light spots formed on the first mirror 410 and the matrix-type light spots formed on the second mirror 420 is reversed, so that the matrix-type light spots are formed symmetrically.
In a second embodiment, the number m of rows of the matrix-type light spots may be m ≧ 2, and m is an even number. The number of columns n of the matrix-type light spot may be a positive integer. The relationship between the number of light passes pass and the number of spots (mn) included in the matrix-type spot can be expressed by the following equation: pass =2mn-1.
It should be noted that the multiple gas reflection cells according to the first and second embodiments of the present invention satisfy the condition that the optical path is reversible, and therefore, when light is incident from the exit hole (out) of the fifth rectangular concave mirror of the second mirror 420 and is reflected between the first mirror 410 and the second mirror 420 for a plurality of times, the light can be emitted from the entrance hole (in) of the second rectangular concave mirror of the first mirror 410, and the same matrix type spot pattern as in the above-described embodiments (incident from the entrance hole in, and emitted from the exit hole out) is formed on the first mirror 410 and the second mirror 420.
In other words, according to the multi-reflection chamber 400 of the present invention, the incident hole may be provided on the second rectangular concave mirror of the first mirror 410 or on the fifth rectangular concave mirror of the second mirror 420. Accordingly, the exit hole corresponding to the entrance hole may be provided on the fifth rectangular concave mirror of the second mirror 420 or on the second rectangular concave mirror of the first mirror 410.
According to the first and second embodiments described above, it can be seen that the matrix-type light spots finally formed on the first and second mirror surfaces 410 and 420 have the following relationship with the curvature centers of the respective rectangular concave mirrors:
assuming a first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) On a straight line in the first direction, and correspondingly, a fourth center of curvature (C) 4 ) And sixth curvatureCenter (C) 6 ) Is located on a straight line in the first direction. The first direction may be a vertical direction or a horizontal direction, and the second direction is a direction perpendicular to the first direction. That is, when the first direction is a vertical direction (y-axis direction), the second direction is a horizontal direction (x-axis direction); when the first direction is a horizontal direction (x-axis direction), the second direction is a vertical direction (y-axis direction).
Then, the first directional pitch of the matrix-type spots formed on the first and second mirrors 410 and 420 is the first curvature center (C) 1 ) And a third center of curvature (C) 3 ) 2 times the first direction distance. Here, assume a first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) Has a first direction distance D 1 /2, the first direction pitch of the matrix type light spots is D 1 。
The second direction pitch of the matrix type spot is the second curvature center (C) 2 ) And a first center of curvature (C) 1 ) 2 times the second directional distance. Here, the second center of curvature (C) is assumed 2 ) And a first center of curvature (C) 1 ) Is a distance D in the second direction 2 /2, the second direction interval of the matrix type light spots is D 2 。
In the multi-reaction chamber of the first embodiment shown in fig. 4 to 5, the first direction is specifically a vertical direction (y-axis direction), the second direction is a horizontal direction (x-axis direction), and D 1 In particular to d l ，D 2 In particular d c 。
In the multi-reaction chamber of the second embodiment shown in fig. 6 to 7, the first direction is specifically a horizontal direction (x-axis direction), the second direction is a vertical direction (y-axis direction), D 1 In particular to d c ，D 2 In particular d l 。
Further, in other embodiments, the predetermined number may be 4. Specifically, the first mirror surface and the second mirror surface of the multi-gas reflecting chamber respectively comprise 4 non-overlapping rectangular concave mirrors (not shown in the figure). Optionally, the first mirror surface and the second mirror surface are mirror surfaces formed by splicing 4 non-overlapping rectangular concave mirrors together, and the projection shapes of the mirror surfaces are rectangular.
Specifically, the first mirror surface comprises a first rectangular concave mirror, a second rectangular concave mirror, a third rectangular concave mirror and a fourth rectangular concave mirror which are spliced with each other. In one embodiment, the first rectangular concave mirror and the third rectangular concave mirror are tiled in the vertical direction, and the first rectangular concave mirror and the fourth rectangular concave mirror are tiled in the horizontal direction. The second rectangular concave mirror and the first rectangular concave mirror are arranged in an oblique diagonal manner, the second rectangular concave mirror and the fourth rectangular concave mirror are spliced in the vertical direction, and the second rectangular concave mirror and the third rectangular concave mirror are spliced in the horizontal direction. And the projection shape of the first mirror surface obtained by splicing the four rectangular concave mirrors is rectangular. The second curvature center of the second rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the vertical direction, and the first curvature center of the first rectangular concave mirror and the fourth curvature center of the fourth concave mirror are collinear in the horizontal direction.
Correspondingly, the second mirror surface comprises a fifth rectangular concave mirror, a sixth rectangular concave mirror, a seventh rectangular concave mirror and an eighth rectangular concave mirror which are spliced with each other. The fifth rectangular concave mirror and the first rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the sixth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the seventh rectangular concave mirror and the third rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged; the eighth rectangular concave mirror and the fourth rectangular concave mirror are arranged symmetrically and have the same mirror surface parameters.
According to an embodiment of the present invention, multiple lasers may be injected into the multi-gas reaction chamber 400, each laser being adapted to detect one gas. Specifically, a plurality of incident holes may be provided in common on the second rectangular concave mirror and/or the fifth rectangular concave mirror, and a plurality of laser beams may be incident on the multiple gas reflecting chambers from different incident holes.
The laser beams are incident through the plurality of incident holes, and then are reflected for multiple times between the first mirror surface and the second mirror surface, and then are emitted, each laser beam incident through each incident hole forms a corresponding matrix type light spot on the first mirror surface and the second mirror surface, and moreover, multiple groups of matrix type light spots formed by the laser beams on the first mirror surface and the second mirror surface are required to be ensured not to be overlapped.
Thus, according to the multi-reaction chamber 400 of the present invention, a plurality of laser beams can be used to simultaneously detect a plurality of gases, thereby improving the utilization rate of the multi-reaction chamber and the detection efficiency of the gases.
According to the multi-gas-reaction chamber 200 provided by the present invention, various matrix-type light spot patterns can be formed. Specifically, by adjusting one or more of the positions of the incident hole and the emergent hole, the incident direction, and the curvature center position of each rectangular concave mirror, the number of rows and columns, the row pitch, and the column pitch of the matrix-type light spots finally formed on the first mirror surface and the second mirror surface can be changed, so that various matrix-type light spot patterns can be obtained. It should be noted that the optical path length is related to the number of light passes and the pitch (radius of curvature R) between the first mirror and the second mirror, and the number of rows (m) and columns (n) of the matrix-type spot determines the number of light passes (pass =2 mn-1) and thus the optical path length.
Based on this, the present invention provides a method 800 for determining the formation of matrix type light spots in a multi-reflector chamber, so as to perform an extended analysis on the types of the patterns of the matrix type light spots that can be formed by the multi-reflector chamber of the present invention, so as to select an optimal matrix type light spot pattern according to the actually required optical path conditions in the actual application process.
According to an embodiment of the invention, the computing device 100 is configured to perform a method 800 of determining formation of a matrix-type spot within a multi-reflector chamber according to the invention. The application 122 of the computing device 100 comprises a plurality of program instructions for executing the method 800 for determining the formation of the matrix-type light spot in the multi-gas-reaction chamber according to the present invention.
It should be noted that the method 800 for determining the matrix-type light spot formed in the multi-chamber according to the present invention establishes an optical model according to the parameters of the first mirror and the second mirror in the multi-chamber, and traces the path of the light based on the optical model to determine the matrix-type light spot formed on the mirror by the light.
Fig. 8 illustrates a flow diagram of a method 800 of determining formation of a matrix-type spot within a multi-gas-reflector chamber, in accordance with one embodiment of the present invention. The method 800 is suitable for execution in a computing device, such as the computing device 100 described above.
As shown in fig. 8, the method 800 begins at step S810.
In step S810, an optical model of the multi-chamber is established based on the mirror parameters of the first mirror and the second mirror of the multi-chamber.
Here, the path of the light ray incident into the multi-reflection cell within the multi-reflection cell may be determined based on the optical model, and the path information includes each light spot formed on the first mirror and the second mirror by the light ray, so that the matrix type light spot formed on the first mirror and the second mirror by the light ray may be determined based on the optical model. The matrix type light spot comprises a plurality of light spots arranged in m rows and n columns.
Subsequently, in step S820, the first center of curvature (C) of the first rectangular concave mirror is set based on the first predetermined distance interval 1 ) A third center of curvature (C) of the third rectangular concave mirror 3 ) And constructing a curvature center first direction distance array.
Here, as can be seen from the multi-chamber reflector 400 described above, with the multi-chamber reflector structure of the first embodiment, the first direction is a vertical direction, and the first center of curvature C is 1 And a third center of curvature C 3 Can affect the vertical pitch (line pitch) of the matrix-type spot that is ultimately formed on the first mirror and the second mirror, and thus also the number of lines of the matrix-type spot.
For the multiple gas reflection chamber structure of the second embodiment, the first direction is a horizontal direction. First center of curvature C 1 And a third center of curvature C 3 The first direction distance (f) may affect the horizontal direction pitch (column pitch) of the matrix type spots finally formed on the first mirror and the second mirror, and thus also the number of columns of the matrix type spots.
In step S830, a second center of curvature (C) of the second rectangular concave mirror is set based on the second predetermined distance interval 2 ) A first center of curvature (C) of the first rectangular concave mirror 1 ) And constructing a curvature center second direction distance array.
Here, the multiple inversions are according to the preceding statementsThe air cell 400 shows that, in the multi-reaction cell structure of the first embodiment, the second direction is a horizontal direction. Second center of curvature C 2 And a first center of curvature C 1 May affect the horizontal pitch (column pitch) of the matrix-type spots that are ultimately formed on the first and second mirrors, and thus may also affect the number of columns of the matrix-type spots.
For the multiple gas reflection chamber structure of the second embodiment, the second direction is a vertical direction. Second center of curvature C 2 And a first center of curvature C 1 Can affect the vertical pitch (line pitch) of the matrix-type spots that are ultimately formed on the first and second mirrors, and thus also the number of rows of the matrix-type spots.
Next, in step S840, for each first direction distance value in the first direction distance array of the curvature center and each second direction distance in the second direction distance array of the curvature center, a light ray is set to be incident from a predetermined incident point, and a matrix-type light spot formed on the first mirror surface and the second mirror surface by the light ray is determined according to the optical model.
Here, the predetermined incidence point may be located on the second rectangular concave mirror of the first mirror surface or on the fifth rectangular concave mirror of the second mirror surface.
Next, in step S850, a matrix-type spot having a number of rows (m) within a predetermined range of the number of rows and a number of columns (n) within a predetermined range of the number of columns is selected as a candidate matrix-type spot, and a set of candidate matrix-type spots is generated based on all the candidate matrix-type spots.
Here, the predetermined number of rows and the predetermined number of columns may be determined by those skilled in the art according to the size of the mirror and the condition of the defined number of light reflection times (light flux times) in practical applications, and the present invention is not limited thereto. It should be noted that the number of reflections is related to the number of spots (number of rows and columns) included in the matrix-type spot. The arrangement of the predetermined range of rows and the predetermined range of columns is required to ensure that the matrix-type light spots finally formed on the mirror surface do not coincide with each other and ensure that the reflection times satisfy the predetermined reflection time condition.
Finally, in step S860, the optical path length corresponding to each candidate matrix-type spot in the candidate matrix-type spot set is determined according to the optical model, so as to select the optimal matrix-type spot meeting the optical path length condition.
It should be noted that the optical path length is related to the number of light passes, the pitch (radius of curvature R) between the first mirror and the second mirror, and the number of light passes (pass =2 mn-1) is related to the number of rows m and the number of columns n of the matrix-type light spot, so that the optical path length corresponding to each candidate matrix-type light spot can be determined according to the optical model. And selecting a candidate matrix type light spot meeting the optical path condition according to the actually required optical path condition as an optimal matrix type light spot.
In one embodiment, a predetermined incident angle array including a plurality of incident angles may be constructed for the incident angle so as to analyze the influence of adjusting the incident angle of the light on the finally formed matrix-type light spot. Specifically, the setting of the incidence of the light from the predetermined incidence point in step S840 may be implemented according to the following method: an array of incident angles may be constructed based on the predetermined angular intervals. Furthermore, for each first direction distance value in the curvature center first direction distance array and each second direction distance in the curvature center second direction distance array, the light ray is set to be incident from a preset incidence point at each incidence angle in the incidence angle array.
Further, a predetermined incidence point array comprising a plurality of predetermined incidence points can be constructed aiming at the predetermined incidence points, so as to analyze the influence on the finally formed matrix-type light spot by adjusting the positions of the predetermined incidence points. Specifically, a predetermined incident point coordinate array may be constructed based on twice the second predetermined distance interval, and incidence of the light ray from the predetermined incident point may be set based on each predetermined incident point coordinate in the predetermined incident point coordinate array.
In one embodiment, the first predetermined distance interval may be set to D 1 /2, the second predetermined distance interval may be set to D 2 /2. Wherein D is 1 Showing the first directional pitch, D, of the matrix type of spots 2 Representing a second directional pitch of the matrix-type spots.
Fig. 9 is a schematic diagram illustrating a plurality of matrix-type spot patterns formed on a second mirror by a multi-gas reflecting chamber according to a first embodiment of the present invention. In which the order of formation of the matrix-type spots is shown by the order of the numbers from small to large. Lines in the figure indicates the row number of the matrix type light spots, col indicates the column number of the matrix type light spots, and pass indicates the corresponding light passing times of the matrix type light spots. The "x" in the figure indicates the center of curvature of each rectangular concave mirror of the first mirror surface.
Fig. 10 is a schematic diagram illustrating a plurality of matrix-type spot patterns formed on a second mirror by a multi-gas reflecting chamber according to a second embodiment of the present invention. In this case, the order of forming the matrix-type light spots is shown in descending order of the numbers. Lines in the figure represents the number of rows of the matrix-type light spots, col represents the number of columns of the matrix-type light spots, and pass represents the number of light fluxes corresponding to the matrix-type light spots. The "x" in the figure indicates the center of curvature of each rectangular concave mirror of the first mirror surface.
In one embodiment, when multiple laser beams need to be injected into the multiple gas reflecting chamber to detect multiple gases, one candidate matrix-type spot can be allocated to each laser beam for detecting each gas based on the optical path condition required for detecting each gas, and the multiple candidate matrix-type spots corresponding to the multiple laser beams do not overlap with each other. According to the optical model, the incident point and the incident angle corresponding to the candidate matrix type facula distributed to each laser beam can be determined, so that each laser beam can be controlled to be respectively incident to the multi-gas reflecting chamber from the corresponding incident point at the corresponding incident angle, the corresponding gas can be detected through each laser beam, and the synchronous detection of various gases can be realized.
Specifically, based on the coordinates of the incident points, an incident hole is formed at a corresponding position on the first mirror surface (second rectangular concave mirror) or the second mirror surface (fifth rectangular concave mirror) of the actual multi-reflection gas chamber, so that each laser beam is respectively incident into the Kong Sheru multi-reflection gas chamber.
Fig. 11 is a schematic diagram showing that two sets of matrix-type light spots are respectively formed on two side mirrors by the multi-gas-reflecting chamber (when multiple gases are detected) according to the first embodiment of the invention. The filled circles in the figure represent the first set of matrix-type spots and the open circles represent the second set of matrix-type spots. In a specific embodiment, the first set of matrix-type spots can be formed by a first laser beam for detecting a first gas and incident from an incident hole to the multiple reflection chamber and reflected for multiple times, and the second set of matrix-type spots can be formed by a second laser beam for detecting a second gas and incident from the incident hole to the multiple reflection chamber and reflected for multiple times.
As shown in fig. 11, the two sets of matrix-type spots on the first mirror 410 and the second mirror 420 do not overlap each other. The second rectangular concave mirror of the first mirror 410 is provided with two incident holes (in) corresponding to the two sets of matrix-type light spots, and the fifth rectangular concave mirror of the second mirror 420 is provided with two exit holes (out) corresponding to the two incident holes. The first laser beam for detecting the first gas can be incident from an incident hole corresponding to the first group of matrix type light spots and finally emitted from a corresponding emergent hole; a second laser beam for detecting a second gas may be incident from the corresponding incident hole of the second matrix-type light spot and finally emitted from the corresponding exit hole.
According to the multi-reflecting-chamber and the method for determining the matrix-type light spots formed in the multi-reflecting-chamber, the structure of the multi-reflecting-chamber suitable for forming the matrix-type light spots is determined by utilizing a genetic algorithm, wherein two side mirror surfaces of the multi-reflecting-chamber are symmetrically arranged, each side mirror surface comprises three rectangular concave mirrors which are spliced with each other, and the matrix-type light spots which are symmetrical with each other can be formed on the two side mirror surfaces after light rays enter the multi-reflecting-chamber. By forming the matrix type light spot pattern, the mirror area of the multiple reflection air chambers can be fully utilized, the optical path volume is high, and the distance between the mirrors on the two sides is large, so that the large optical path can be realized by fewer reflection times. In addition, according to the method for determining the matrix-type light spots formed in the multi-gas-reflecting chamber, the patterns of a plurality of matrix-type light spots formed in the multi-gas-reflecting chamber can be determined, so that the optimal matrix-type light spot pattern can be selected according to the actually required optical path condition in the actual application process.
In addition, according to the multi-gas-reflecting chamber disclosed by the invention, a plurality of laser beams are incident to the multi-gas-reflecting chamber and form a plurality of groups of non-overlapping matrix-type light spots, and each laser beam is respectively used for detecting one gas, so that synchronous detection of a plurality of gases in the multi-gas-reflecting chamber can be realized, and the utilization rate of the multi-gas-reflecting chamber and the detection efficiency of the gases are improved.
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 thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as removable hard drives, U.S. disks, floppy disks, 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 execute the data storage method and/or the data query method of the present invention according to instructions in the program code stored in the memory.
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 this invention. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, 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 may be used in any combination.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

Claims (10)

1. A multiple gas-reflecting chamber comprising first and second mirror surfaces arranged symmetrically, wherein:
the first mirror surface and the second mirror surface respectively comprise a preset number of non-overlapping rectangular concave mirrors;
the first mirror surface or the second mirror surface is provided with an incident hole, light rays incident through the incident hole are suitable for being emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the light rays are suitable for forming mutually symmetrical matrix-type light spots on the first mirror surface and the second mirror surface.
2. The multi-reaction chamber of claim 1,
the predetermined number is 3;
the first mirror surface comprises a first rectangular concave mirror, a second rectangular concave mirror and a third rectangular concave mirror which are spliced with each other, wherein a first curvature center (C) of the first rectangular concave mirror 1 ) A third center of curvature (C) of the third concave mirror 3 ) Collinear;
the second mirror includes:
the fourth rectangular concave mirror and the first rectangular concave mirror are same in mirror surface parameter and are symmetrically arranged;
the fifth rectangular concave mirror and the second rectangular concave mirror have the same mirror surface parameters and are symmetrically arranged;
and the sixth rectangular concave mirror and the third rectangular concave mirror are the same in mirror surface parameter and are symmetrically arranged.
3. The multiple reaction chamber according to claim 2, wherein said first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) On a line in a first direction;
the first direction pitch of the matrix type spot is the first curvature center (C) 1 ) And a third center of curvature (C) 3 ) 2 times the first directional distance;
a second directional pitch of the matrix-type spot is the second center of curvature (C) 2 ) And a first center of curvature (C) 1 ) 2 times the second directional distance;
the first direction is a vertical direction or a horizontal direction, and the second direction is perpendicular to the first direction.
4. The multiple gas reflection chamber as claimed in claim 3, wherein the second curvature center (C) is a vertical direction when the first direction is a vertical direction 2 ) And a first center of curvature (C) 1 ) The second direction distance of (a) is:
Figure FDA0003735904390000011
wherein L represents the second center of curvature (C) 2 ) And a first center of curvature (C) 1 ) M represents the number of rows of said matrix-type spot, d l A first direction pitch representing the matrix type of light spots;
when the first direction is a horizontal direction, the second curvature center (C) 2 ) And a first center of curvature (C) 1 ) The second direction distance of (a) is:
Figure FDA0003735904390000021
wherein L represents the second center of curvature(C 2 ) And a first center of curvature (C) 1 ) N represents the number of columns of the matrix type of light spots, d c Representing a first directional pitch of the matrix-type spots.
5. The multi-reaction chamber of any one of claims 2 to 4,
the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are spliced in sequence;
the height of the first rectangular concave mirror is equal to the sum of the heights of the second rectangular concave mirror and the third rectangular concave mirror, and the lengths of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same;
the first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) Is positioned on a straight line in the vertical direction.
6. The multi-reaction chamber of any one of claims 2 to 4,
the first rectangular concave mirror is spliced with the second rectangular concave mirror and the third rectangular concave mirror respectively;
the length of the first rectangular concave mirror is equal to the sum of the lengths of the second rectangular concave mirror and the third rectangular concave mirror, and the heights of the first rectangular concave mirror, the second rectangular concave mirror and the third rectangular concave mirror are the same;
the first center of curvature (C) 1 ) And a third center of curvature (C) 3 ) Is positioned on a straight line in the horizontal direction.
7. A method of determining formation of a matrix-type spot in a multi-gas-reflective cell, performed in a computing device, the multi-gas-reflective cell as claimed in any one of claims 1-6, the method comprising the steps of:
establishing an optical model of the multi-gas-reflecting chamber based on mirror surface parameters of a first mirror surface and a second mirror surface of the multi-gas-reflecting chamber;
based on the first predetermined distance interval, is the first center of curvature (C) of the first rectangular concave mirror 1 ) And a third rectangular concave mirrorThird center of curvature (C) 3 ) Constructing a curvature center first direction distance array;
based on the second predetermined distance interval, is the second center of curvature (C) of the second rectangular concave mirror 2 ) A first center of curvature (C) of the first rectangular concave mirror 1 ) Constructing a curvature center second direction distance array;
setting the incidence of light rays from a preset incidence point for each first-direction distance value in the curvature center first-direction distance array and each second-direction distance in the curvature center second-direction distance array, and determining matrix-type light spots formed on the first mirror surface and the second mirror surface by the light rays according to the optical model;
selecting the matrix type light spots of which the row number is within a preset row number range and the column number is within a preset column number range as candidate matrix type light spots, and generating a candidate matrix type light spot set based on all the candidate matrix type light spots; and
and determining the optical path corresponding to each candidate matrix type light spot according to the optical model so as to select the candidate matrix type light spot meeting the fixed optical path condition as the optimal matrix type light spot.
8. The method of claim 7, wherein the step of setting the incidence of the light from the predetermined incidence point comprises:
constructing an incidence angle array based on a preset angle interval;
and setting the light to be incident from the preset incidence point at each incidence angle in the incidence angle array respectively.
9. A computing device, comprising:
at least one processor; and
a memory having stored thereon program instructions configured to be executed by the at least one processor, the program instructions comprising instructions for performing the method of any one of claims 7-8.
10. A readable storage medium storing program instructions that, when read and executed by a computing device, cause the computing device to perform the method of any of claims 7-8.
CN202210804247.3A 2022-07-07 2022-07-07 Multi-reflector chamber and method for determining matrix type light spot formed in multi-reflector chamber Pending CN115219424A (en)

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