CN115219453A - Method for determining light spot pattern formed in multi-gas-reflecting chamber and multi-gas-reflecting chamber - Google Patents
Method for determining light spot pattern formed in multi-gas-reflecting chamber and multi-gas-reflecting chamber Download PDFInfo
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Abstract
The invention discloses a method for determining a light spot pattern formed in a multi-gas-reflecting chamber and the multi-gas-reflecting chamber, wherein the method comprises the following steps: establishing an optical model of a plurality of gas reflecting chambers based on the mirror surface parameters; defining the distance between the first mirror surface and the second mirror surface as a first distance, and constructing a first distance array for the first distance; defining the distance between the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the splicing position of the plurality of rectangular concave mirrors as a second distance, and constructing a second distance array for the second distance; for each first distance value and each second distance value, setting the coordinate incidence of the light from a preset incidence point, and determining a light spot pattern formed on the mirror surface by the light according to an optical model; selecting a spot pattern which is in accordance with a preset shape and has a spot spacing within a preset spot spacing range as a candidate spot pattern; and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.
Description
Technical Field
The invention relates to the technical field of spectrum detection, in particular to a method for determining a light spot pattern formed in a multi-gas-reflecting-chamber, the multi-gas-reflecting-chamber and computing equipment.
Background
The optical multi-gas-reflecting chamber is widely applied to a Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology, and can realize a long optical path in a relatively small volume, so that the detection sensitivity is improved, and the detection limit is reduced. The optical multiple-reflection chamber needs to finely adjust the mirror surface in the chamber to ensure that the light beam enters the multiple-reflection chamber through the incident hole and is emitted from the exit hole after being reflected back and forth for a certain number of times. According to the Lambert-Beer law, the acting distance of light and a sample is increased, the amplitude of an absorption signal can be increased, the spectral detection sensitivity can be effectively improved, and multiple reflection is an effective way for realizing a long optical path. In the fields of scientific research, environmental protection, coal mine gas monitoring and the like, trace gases such as methane, carbon monoxide, oxygen and the like are analyzed and detected by a spectral absorption method.
In the prior art, the commonly used multiple gas-reflecting chambers include: white, herriott, chernin, discrete mirror, and toroidal chambers. The White-type multi-reflection gas chamber can realize multiple reflection of light beams in the multi-reflection gas chamber, but the design of the White-type multi-reflection gas chamber has some defects, such as overlarge volume, poor stability, low effective utilization rate of a mirror surface and the like, and the application range of the White-type multi-reflection gas chamber is limited. The Chernin type multi-gas-reflecting chamber is an improved optical multi-gas-reflecting chamber on the basis of the White type multi-gas-reflecting chamber, can change an absorption optical path at any time according to needs, but has a complex structure and a large volume, and limits the application of the Chernin type multi-gas-reflecting chamber in the requirement of a miniaturized instrument. The Herriott air chamber is formed by coaxially and symmetrically arranging two identical spherical mirror surfaces, and a reflection spot of light on the mirror surfaces presents a single circular or elliptical pattern, so that the utilization rate of the area of the cavity mirror is low. The discrete mirror multi-reflection chamber overcomes the defects of a Herriott type multi-reflection chamber, improves the utilization rate of the area of a cavity mirror, can form light spot distribution of Lissajous figures on a mirror surface, but has higher processing cost and low yield of discrete lenses. The annular gas chamber is composed of a single annular mirror surface, the effective optical path of the gas chamber can be changed by adjusting the incident angle of light rays, but the requirement on the accuracy of the incident angle is very high.
According to the Lambert-Beer law, the amplitude of the absorption signal is in direct proportion to the acting distance of the light and the sample, so that the range and the sensitivity of spectrum detection can be adjusted by changing the optical path of the multiple reflecting chambers; reducing the volume of multiple gas-reflecting chambers can promote the development of portable sensors and increase the speed of gas detection.
Therefore, a method for determining the light spot pattern formed in the multi-reaction chamber is needed, so that the designed multi-reaction chamber has a smaller volume, the optical path can be adjusted according to the actual detection requirement, and the detection sensitivity is improved.
Disclosure of Invention
To this end, the present invention provides a method of determining the pattern of spots formed within a multiple gas reaction chamber that solves or at least mitigates the problems identified above.
According to an aspect of the present invention, there is provided a method of determining a spot pattern formed within a multi-reflector, performed in a computing device, the multi-reflector including first and second mirror surfaces having the same mirror surface parameters and being symmetrically arranged, the first and second mirror surfaces respectively including a plurality of rectangular concave mirrors spliced to each other, a light ray adapted to be incident from any one of the rectangular concave mirrors and to sequentially traverse each of the rectangular concave mirrors and to be emitted after being reflected between the first and second mirror surfaces a plurality of times, the light ray adapted to form a spot pattern of the same shape on each of the rectangular concave mirrors of the first and second mirror surfaces, the method including: determining mirror surface parameters of the first mirror surface and the second mirror surface, and establishing an optical model of a plurality of gas reflecting chambers based on the mirror surface parameters; defining the distance between the first mirror surface and the second mirror surface as a first distance, setting the range of the first distance, and constructing a first distance array for the first distance based on a first distance interval; defining the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the distance between the splicing part of the rectangular concave mirror and the plurality of rectangular concave mirrors as a second distance, setting the range of the second distance, and constructing a second distance array for the second distance based on a second distance interval; setting the coordinates of a preset incidence point of a ray to be incident from each first distance value in the first distance array and each second distance value in the second distance array, and determining a light spot pattern formed on each rectangular concave mirror of the first mirror surface and the second mirror surface by the ray according to the optical model; selecting a light spot pattern which is in accordance with a preset shape and has a light spot spacing within a preset light spot spacing range as a candidate light spot pattern, and generating a candidate light spot pattern set based on all the candidate light spot patterns; and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.
Alternatively, in the method of determining a spot pattern formed in a multi-gas-reaction chamber according to the present invention, setting the light incident from a predetermined incident point coordinate 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 of determining a spot pattern formed in a multi-gas-reaction chamber according to the present invention, setting the light incident from a predetermined incident point coordinate includes: constructing a preset incidence point coordinate array based on the preset coordinate difference value; 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 of determining a spot pattern formed in a multi-chamber according to the present invention, determining a spot pattern formed on each of the rectangular concave mirrors of the first and second mirror surfaces by the light rays according to the optical model includes: and determining the path of the light ray in the multi-gas reflecting chamber according to the optical model, wherein the path information comprises each light spot formed by the light ray on each rectangular concave mirror.
Optionally, in the method for determining a spot pattern formed in a multi-gas-reflecting chamber according to the present invention, the path information further includes coordinates of an exit point of the light ray, and the selecting a spot pattern that conforms to a predetermined shape and has a spot pitch within a predetermined spot pitch range as a candidate spot pattern includes: and selecting a spot pattern which is in accordance with a preset shape, has a spot interval within a preset spot interval range, and has the same coordinates of the emergent point and the preset incident point as a candidate spot pattern.
Alternatively, in the method of determining a spot pattern formed within a multi-gas-reaction chamber according to the present invention, the predetermined shape includes a line shape or an ellipse shape, and the candidate spot pattern includes a line-shaped spot pattern or an ellipse-shaped spot pattern.
Optionally, in the method of determining a pattern of light spots formed within a multi-gas-reaction chamber according to the present invention, the predetermined shape comprises a combined shape comprising a shape of a combination of multiple lines, a shape of a combination of lines, and an ellipse; the candidate spot patterns include a multi-line combined spot pattern, a line-shaped combined spot pattern, and an elliptical combined spot pattern.
Alternatively, in the method of determining the pattern of light spots formed in the multi-gas-reflecting chamber according to the present invention, the plurality of rectangular concave mirrors which are spliced to each other are arranged side by side or circumferentially.
Optionally, in the method for determining the light spot pattern formed in the multi-gas reflecting chamber according to the present invention, the first mirror surface and the second mirror surface respectively include two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are spliced with each other; the distance between the projection point of the curvature center of the first rectangular concave mirror on the mirror surface along the optical axis direction and the splicing position of the two rectangular concave mirrors is a second distance; the second mirror surface includes second rectangle concave mirror and the fourth rectangle concave mirror of concatenation each other, the second rectangle concave mirror with the same and the symmetrical arrangement of mirror surface parameter of first rectangle concave mirror, the fourth rectangle concave mirror with the same and the symmetrical arrangement of mirror surface parameter of third rectangle concave mirror.
Optionally, in the method for determining the light spot pattern formed in the multi-gas reflecting chamber according to the present invention, when the curvature radius R of the rectangular concave mirror is 100mm, the range of the first distance d is 10mm ≦ d ≦ 200mm, and the first distance interval is 0.1mm; the range of the second distance c is more than or equal to 0 and less than or equal to 3mm, and the interval of the second distance is 0.01mm.
According to one aspect of the present invention, there is provided a multi-gas-reflecting chamber comprising first and second mirror planes of identical mirror parameters and arranged symmetrically, wherein: the first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are spliced with each other, wherein at least one rectangular concave mirror is provided with an incident hole; the light rays incident through the incident hole are suitable for sequentially traversing each rectangular concave mirror, are reflected for multiple times between the first mirror surface and the second mirror surface and then are emitted, and the light rays are suitable for forming a light spot pattern with a preset shape on each rectangular concave mirror of the first mirror surface and the second mirror surface.
Alternatively, in the multiple gas reflection chamber according to the present invention, the plurality of rectangular concave mirrors which are spliced to each other are arranged side by side or circumferentially.
Optionally, in the multi-gas reflecting chamber according to the present invention, the first mirror surface and the second mirror surface respectively include two rectangular concave mirrors spliced to each other, and the two rectangular concave mirrors are arranged side by side; wherein, first mirror surface includes first rectangle concave mirror and the third rectangle concave mirror of mutual concatenation, the second mirror surface includes second rectangle concave mirror and the fourth rectangle concave mirror of mutual concatenation, the second rectangle concave mirror with the same and symmetrical arrangement of mirror surface parameter of first rectangle concave mirror, the fourth rectangle concave mirror with the same and symmetrical arrangement of mirror surface parameter of third rectangle concave mirror.
Alternatively, in the multiple gas reflection chamber according to the present invention, the predetermined shape is a line shape or an oval shape.
Alternatively, in the multiple gas reflection chamber according to the present invention, the predetermined shape includes a combined shape including a shape of a combination of multiple lines, a shape of a combination of lines and an ellipse.
Optionally, in the multiple gas reflecting chamber according to the present invention, a plurality of penetrating holes are provided on the first mirror surface and the second mirror surface; the laser beams are suitable for being incident from the incident holes and sequentially traversing each rectangular concave mirror, and are reflected between the first mirror surface and the second mirror surface for multiple times and then emitted, and the laser beams are suitable for forming a combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface; wherein each laser is adapted to detect one gas.
Optionally, in the multi-gas-reflecting chamber according to the present invention, the combined light spot pattern includes an X-shaped light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are suitable for being incident from the first incident hole and the second incident hole and sequentially traversing each rectangular concave mirror, and are emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the two laser beams are suitable for forming an X-shaped light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
Optionally, in the multi-gas-reflecting chamber according to the present invention, the combined light spot pattern includes a linear and elliptical combined light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are suitable for being incident from the first incident hole and the second incident hole and sequentially traversing each rectangular concave mirror, and are emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the two laser beams are suitable for forming linear and elliptical combined light spot patterns on each rectangular concave mirror of the first mirror surface and the second mirror surface.
According to an aspect of the 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.
The method for determining the light spot pattern formed in the multi-gas-reflecting chamber comprises 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, establishing a first distance array for the distance between the first mirror surface and the second mirror surface based on a first distance interval, and establishing a second distance array for the distance between a projection point of a curvature center of a rectangular concave mirror on the mirror surface along the optical axis direction and the splicing position of a plurality of rectangular concave mirrors based on a second distance interval. And setting the coordinates of the incidence point of the light ray for each first distance value in the first distance array and each second distance value in the second distance array, and determining the light spot patterns formed on each rectangular concave mirror of the first mirror surface and the second mirror surface by the light ray according to the optical model. Therefore, a plurality of light spot patterns which can be formed in the multi-gas-reaction chamber can be determined, the light spot patterns which are in accordance with the preset shape and have the light spot space within the preset light spot space range are selected as candidate light spot patterns, a candidate light spot pattern set is generated based on all the candidate light spot patterns, and the optical path corresponding to each candidate light spot pattern can also be determined according to the optical model. Therefore, in the practical application process, the required optical path condition can be determined according to the detection sensitivity required when the gas is detected, and the optimal light spot pattern is selected from all candidate light spot patterns according to the required optical path condition, so that the detection sensitivity and the detection precision can be improved, and the detection requirements of different application scenes can be met.
Furthermore, the multi-gas reflecting chamber designed according to the method for determining the light spot pattern formed in the multi-gas reflecting chamber is small and compact in size, and each side mirror surface comprises a plurality of rectangular concave mirrors which are spliced with each other. Therefore, the multi-gas-reflecting chamber is more convenient to carry in practical application, and the gas can be detected more conveniently. Moreover, the designed multi-reflecting-chamber can realize that light rays sequentially traverse each rectangular concave mirror in the multi-reflecting-chamber and form a longer optical path after being reflected for multiple times on the premise of ensuring the stability of optical path transmission, so that the sensitivity and the precision of gas detection based on laser absorption spectrum are improved. According to different placing modes of the multiple gas reflecting chambers, such as side-by-side arrangement, surrounding arrangement and the like, the measurement requirements of different application scenes can be met.
In addition, according to the multi-gas-reflecting chamber of the present invention, by making a plurality of laser beams for detecting a plurality of gases incident to the multi-gas-reflecting chamber, the plurality of laser beams are emitted after being reflected a plurality of times between the mirror surfaces on both sides, and a combined spot pattern is formed on the mirror surfaces on both sides. Like this, can realize in the less many anti-gas chambers of volume, carry out synchronous detection to multiple gas through many laser, improved the utilization ratio to many anti-gas chambers and to the detection efficiency of gas.
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 illustrates a block diagram of a computing device 100, according to one embodiment of the invention;
FIG. 2a shows a schematic structural diagram of a multiple reaction chamber 200 according to one embodiment of the present invention;
FIG. 2b shows a schematic projection of a rectangular concave mirror according to one embodiment of the present invention;
FIG. 3 illustrates a flow diagram of a method 300 of determining a pattern of spots formed within a multiple gas reaction chamber, in accordance with one embodiment of the present invention;
fig. 4 shows a schematic diagram of forming a line-shaped spot pattern on the first mirror surfaces (the first rectangular concave mirror M1 and the third rectangular concave mirror M3) according to one embodiment of the present invention;
fig. 5 shows a schematic diagram of forming elliptical spot patterns on the first mirror surface (first rectangular concave mirror M1 and third rectangular concave mirror M3) and the second mirror surface (second rectangular concave mirror M2 and fourth rectangular concave mirror M4) according to one embodiment of the present invention;
FIG. 6 is a schematic diagram showing the linear light spot pattern shown in FIG. 4 rotated clockwise and counterclockwise by a predetermined angle around the center of the mirror surface;
FIG. 7 shows a schematic diagram of the formation of a combined spot pattern (combination of a linear spot pattern and an elliptical spot pattern) on each of the rectangular concave mirrors of the first mirror and the second mirror according to one embodiment of the present invention;
fig. 8 and 9 respectively show schematic diagrams of a plurality of rectangular concave mirror surrounding arrangements according to one embodiment of the 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.
In accordance with aspects of the present invention, the method 300 of determining a pattern of light spots formed within a multi-chamber is performed using a computing device by creating an optical model of the multi-chamber in the computing device. The method comprises the steps of setting the distance between two side mirror surfaces (a first mirror surface and a second mirror surface) of the multi-gas-reflecting chamber and the incidence condition of light, determining the light spot patterns formed on the two side mirror surfaces by the light according to an optical model, and selecting the light spot patterns meeting the preset condition as candidate light spot patterns. Thus, in practical application, the required optical path condition can be determined according to the detection sensitivity required when the gas is detected, and the optimal light spot pattern can be selected from all candidate light spot patterns according to the required optical path condition, so that the detection requirements of different application scenes can be met. One 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 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. An 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.
The network communication link may be one example of a communication medium. Communication media may typically be embodied by computer readable instructions, data structures, program modules, and may include any information delivery media, 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 made 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 are not limited thereto.
In an embodiment in accordance with the invention, the computing device 100 is configured to perform a method 300 of determining a pattern of spots formed within a multi-reaction chamber in accordance with the invention. Among other things, application 122 of computing device 100 includes a plurality of program instructions that implement method 300 for determining a pattern of spots formed within a multiple gas reaction chamber in accordance with the present invention.
It should be noted that the method 300 for determining the light spot pattern formed in the multi-gas-reflecting 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-gas-reflecting chamber, and tracks the path of the light ray based on the optical model to determine the light spot pattern formed on the first mirror and the second mirror by the light ray.
Wherein, fig. 2a shows a schematic structural view of a multiple gas reaction chamber 200 according to an embodiment of the present invention.
As shown in fig. 2a, the multi-reflection chamber 200 includes a first mirror 210 and a second mirror 220 symmetrically arranged, and the first mirror 210 and the second mirror 220 are respectively arranged at both sides of the multi-reflection chamber 200. The mirror parameters of the first mirror 210 and the second mirror 220 are the same, and the first mirror 210 and the second mirror 220 respectively comprise a plurality of rectangular concave mirrors spliced with each other. Here, it should be noted that the present invention does not limit the number of the rectangular concave mirrors included in the two side mirror surfaces, and the number can be set by those skilled in the art according to actual needs.
The rectangular concave mirror is a concave mirror having a rectangular projection shape. The concave mirror may be a concave spherical mirror, and the rectangular concave mirror may be a rectangular concave spherical mirror.
It can be understood that, based on the mirror parameters of the first mirror 210 and the second mirror 220 of the multi-gas-reflecting chamber 200 being the same and symmetrically arranged, each of the rectangular concave mirrors in the first mirror 210 is the same as the mirror parameters of the corresponding rectangular concave mirror in the second mirror 220 and symmetrically arranged. The mirror surface parameters of the rectangular concave mirror specifically include the curvature radius of the rectangular concave mirror and the size of the rectangular concave mirror.
In the embodiment according to the present invention, the mirror surfaces on each side may comprise a plurality of rectangular concave mirrors spliced with each other, and the rectangular concave mirrors may be arranged side by side or around. That is, the plurality of rectangular concave mirrors on each side may be spliced together side by side or may be spliced together in a circular manner (end to end).
As shown in FIG. 2a, the present invention uses the midpoint of the connecting line of the geometric centers of the first mirror 210 and the second mirror 220 as the origin O, and uses the straight line of the connecting line of the geometric centers of the first mirror 210 and the second mirror 220 as the z-axis, thereby establishing coordinate axes.
According to an embodiment of the present invention, as shown in fig. 2a, the first mirror surface 210 and the second mirror surface 220 respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). In other words, the first mirror surface 210 and the second mirror surface 220 are respectively formed by splicing two non-overlapping rectangular concave mirrors together side by side. The two rectangular concave mirrors joined to each other have the same height (length in the y-axis direction), and the projection shapes of the first mirror surface 210 and the second mirror surface 220 are also rectangular.
Specifically, the first mirror 210 includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 that are spliced to each other. The second mirror 220 includes a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 which are spliced with each other. The second rectangular concave mirror and the first rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
In one embodiment, the radii of curvature of each of the rectangular concave mirrors included in the first mirror 210 and each of the rectangular concave mirrors included in the second mirror 220 are the same. For example, the first rectangular concave mirror M1, the third rectangular concave mirror M3, the second rectangular concave mirror M2, and the fourth rectangular concave mirror M4 all have a radius of curvature of R.
In one embodiment, the mirror parameters (radius of curvature and size) of all the rectangular concave mirrors included in the first mirror 210 and the second mirror 220 are the same.
In one embodiment, each of the rectangular concave mirrors of the first mirror 210 and the second mirror 220 may be a narrow strip, which is advantageous for reducing the volume of the multi-chamber 200.
In one embodiment, the radius of curvature of each rectangular concave mirror may be, for example, 100mm, wherein the size of first rectangular concave mirror M1 (second rectangular concave mirror M2) is, for example, 50.8mm × 6mm, and the size of third rectangular concave mirror M3 (fourth rectangular concave mirror M4) is, for example, 15mm × 10mm.
According to the multi-reflection gas chamber 200 of the present invention, the light can be incident to the multi-reflection gas chamber 200 from any one of the rectangular concave mirrors of the first mirror 210 and the second mirror 220 and sequentially traverse each rectangular concave mirror, and the light can be emitted after being reflected between the first mirror 210 and the second mirror 220 for multiple times. Finally, the light rays may form the same shaped spot pattern on each of the rectangular concave mirrors of the first mirror 210 and the second mirror 220. Moreover, the spot patterns formed on the first mirror 210 and the second mirror 220 are symmetrical to each other. Here, each spot pattern includes a plurality of spots, and specifically a spot pattern composed of a plurality of spots.
In one embodiment of the present invention, at least one of the rectangular concave mirrors of the first mirror 210 and the second mirror 220 is provided with an incident hole. Light may be incident from the incident hole into the multi-reflection chamber 200. The light rays incident through the incident hole sequentially traverse each rectangular concave mirror, and are reflected between the first mirror surface 210 and the second mirror surface 220 for multiple times and then emitted. Finally, the light rays may form the same shaped spot pattern on each of the rectangular concave mirrors of the first mirror surface 210 and the second mirror surface 220, and the spot patterns formed on the first mirror surface 210 and the second mirror surface 220 are symmetrical to each other.
FIG. 3 illustrates a flow diagram of a method 300 of determining a pattern of spots formed within the multi-gas chamber 200 according to one embodiment of the invention. The method 300 is suitable for execution in a computing device, such as the computing device 100 described above.
It should be noted that the method 300 for determining the light spot pattern formed in the multi-chamber 200 of the present invention establishes an optical model according to the parameters of the first mirror 210 and the second mirror 220 in the multi-chamber 200, and traces the path of the light ray based on the optical model to determine the light spot pattern formed on the first mirror 210 and the second mirror 220.
As shown in FIG. 3, the method 300 includes steps S310-S360.
In step S310, mirror parameters of the first mirror 210 and the second mirror 220 are determined, and an optical model of the multi-chamber 200 is established based on the mirror parameters. Here, the mirror parameters of the first mirror 210 and the second mirror 220 may specifically include: the first mirror 210 and the second mirror 220 each include a radius of curvature and a size of each rectangular concave mirror.
It should be noted that, the path of the light ray in the multi-gas-reflecting chamber 200 can be determined according to the established optical model, and the path information includes each light spot formed on each rectangular concave mirror of the first mirror surface 210 and the second mirror surface 220, so that the light spot pattern formed by the plurality of light spots finally formed on each rectangular concave mirror of the first mirror surface 210 and the second mirror surface 220 can be determined according to the optical model.
In step S320, the distance (mirror pitch) between the first mirror 210 and the second mirror 220 is defined as a first distance d, a range of the first distance is set, and a first distance array is constructed for the first distance based on the first distance interval. Here, it is understood that each first distance value in the constructed first distance array is within the set first distance range.
For example, in one embodiment, the first mirror 210 includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 that are spliced to each other. The second mirror 220 includes a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 which are spliced with each other. The second rectangular concave mirror and the first rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
In this embodiment, the distance between the first rectangular concave mirror M1 and the second rectangular concave mirror M2 is the first distance d. The distance between the third rectangular concave mirror M3 and the fourth rectangular concave mirror M4 is the first distance d.
In this embodiment, a light ray may be incident from the first rectangular concave mirror M1 in the first mirror surface 210 to the multiple reflection chamber 200, for example, and sequentially traverse the second rectangular concave mirror M2 → the third rectangular concave mirror M3 → the fourth rectangular concave mirror M4 → the first rectangular concave mirror M1, and then, may continue the second traverse: second rectangular concave mirror M2 → third rectangular concave mirror M3 → fourth rectangular concave mirror M4 → first rectangular concave mirror M1. And so on, until the light ray exits after multiple reflections between the first mirror 210 and the second mirror 220.
In step S330, a distance between a projection point of the curvature center of the rectangular concave mirror on the mirror surface in the optical axis direction (i.e., the thinnest point of the rectangular concave mirror) and a place where the plurality of rectangular concave mirrors are joined is defined as a second distance c, a range of the second distance is set, and a second distance array is constructed for the second distance based on the second distance interval. Here, it is understood that each second distance value in the constructed second distance array is within the set second distance range.
Note that, the projection point of the curvature center of the rectangular concave mirror on the mirror surface in the optical axis direction is: the intersection line (shown as a dotted line in fig. 2 a) of the plane where the center of the rectangular concave mirror is located and the mirror surface of the rectangular concave mirror is also the thinnest point of the rectangular concave mirror.
Fig. 2b shows a schematic projection of a rectangular concave mirror (in the z-axis direction) according to an embodiment of the invention. As shown in fig. 2b, the projected shape of the rectangular concave mirror is rectangular, and the left and right ends of the mirror surface are asymmetric. The S' point represents a projection of the center of the rectangular concave mirror along the z-axis direction, the dotted line represents a projection point of the center of curvature of the rectangular concave mirror on the mirror surface along the optical axis direction (i.e., the z-axis direction), and a distance from the dotted line to one end of the rectangular concave mirror (a joint with another rectangular concave mirror) is a second distance c.
For example, in one embodiment, the first mirror surface 210 and the second mirror surface 220 respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). Then, the distance from the projection point (S') of the center of curvature of the first rectangular concave mirror (or the third rectangular concave mirror) on the mirror surface in the optical axis direction to the junction of the two rectangular concave mirrors (i.e., the junction of the first rectangular concave mirror and the third rectangular concave mirror) is the second distance c.
In one embodiment, the relationship between the first distance d and the radius of curvature R of the rectangular concave mirror is: c is more than or equal to 0 and less than or equal to 2R. When the curvature radius R of the rectangular concave mirror is 100mm, the first distance d can be within a range of 10mm < d < 200mm, and the first distance interval can be 0.1mm, for example. The second distance c may range, for example, from 0 ≦ c ≦ 3mm, and the second distance interval may be, for example, 0.01mm.
In step S340, for each first distance value in the first distance array and each second distance value in the second distance array, the light ray is set to be incident from a predetermined incident point coordinate, and the light spot pattern formed by the light ray on each rectangular concave mirror of the first mirror 210 and the second mirror 220 is determined according to the optical model. Here, the predetermined incident point may be located on any one of the rectangular concave mirrors of the first mirror 210 or the second mirror 220.
Specifically, the path of the light ray within the multi-chamber 200 may be determined based on the optical model, and the path information includes each light spot formed on each rectangular concave mirror of the first mirror surface 210 and the second mirror surface 220, so that a light spot pattern composed of a plurality of light spots finally formed on each rectangular concave mirror of the first mirror surface 210 and the second mirror surface 220 may be determined based on the optical model.
In addition, the path information may further include information such as an incident point coordinate, an incident angle, an exit point coordinate, and the number of reflections of the light.
In one embodiment, an incident angle array comprising a plurality of incident angles may be constructed for the incident angle in order to analyze the effect on the finally formed spot pattern by adjusting the incident angle of the light ray.
Specifically, in step S340, setting the light ray to be incident from the predetermined incident point can be implemented according to the following method: an incidence angle array may be constructed based on the predetermined angle intervals. Furthermore, for each first distance value in the first distance array and each second distance value in the second distance array, the light ray is set to be incident from the preset incidence point at each incidence angle in the incidence angle array respectively.
Further, a predetermined incident point array including a plurality of predetermined incident points may be constructed for the predetermined incident points, so as to analyze an influence on the finally formed spot pattern by adjusting the positions of the predetermined incident points. Specifically, a predetermined incident point coordinate array may be constructed based on the predetermined coordinate difference value, and the incidence of the ray from the predetermined incident point may be set based on each predetermined incident point coordinate in the predetermined incident point coordinate array.
For example, in one implementation, the predetermined incident point array including a plurality of predetermined incident points may be constructed by setting the z-coordinate of each predetermined incident point to be 0,y coordinates in a range of 0 to 22mm and the predetermined coordinate difference to be 0.1mm. Here, the predetermined coordinate difference is a y-coordinate difference.
In step S350, a spot pattern that conforms to the predetermined shape and has a spot pitch within a predetermined spot pitch range is selected as a candidate spot pattern, and a candidate spot pattern set is generated based on all candidate spot patterns.
Here, the present invention is not limited to the specific shape type of the predetermined shape, and the skilled person can determine the predetermined shape according to the actual detection requirement, so that the light forms the light spot pattern of the predetermined shape on each side mirror surface.
In one embodiment, the predetermined shape may be a line shape, or a single shape such as an ellipse, and the spot pattern of the single shape is a single mode spot pattern. Accordingly, a linear spot pattern may be selected as the candidate spot pattern, or an elliptical spot pattern may be selected as the candidate spot pattern. The candidate spot patterns may include linear spot patterns or elliptical spot patterns.
In addition, the facula space is limited within the preset facula space range, so that a plurality of facula formed on each side mirror surface can be ensured not to be overlapped, and the phenomenon of light interference can be avoided. In one embodiment, the predetermined spot pitch range may be set to be not less than 0.5mm.
In step S360, an optical path corresponding to each candidate spot pattern is determined according to the optical model, so as to select a candidate spot pattern meeting a predetermined optical path condition as an optimal spot pattern.
It should be noted that the predetermined optical path condition set here is not particularly limited by the present invention. It will be appreciated that in practical applications, the predetermined optical path conditions may be determined and pre-configured according to the detection sensitivity required when detecting the gas. Therefore, the optimal light spot pattern is selected from all candidate light spot patterns according to the preset optical path condition, light (laser) is controlled to be incident to the multi-reflection chamber 200 based on the path information corresponding to the selected optimal light spot pattern, and gas in the multi-reflection chamber 200 is detected, so that the detection sensitivity and precision can be improved, and the detection requirement of an actual application scene can be met.
In one embodiment, the predetermined optical path condition may be implemented, for example, as: the optical path range is 2.5-10 m.
In one embodiment, the path information includes the coordinates of the exit point of the light ray. When the reentrant condition needs to be satisfied, in step S350, a light spot pattern that conforms to the predetermined shape, has a light spot pitch within the predetermined light spot pitch range, and has the same coordinates of the exit point and the predetermined incident point may be selected as a candidate light spot pattern.
It should be understood that the reentrant condition means that the coordinates of the exit point of the ray are the same as the coordinates of the entrance point, i.e., the exit point of the ray coincides with the entrance point. When the candidate light spot pattern is selected, the coordinates of the emergent point in the path are further limited to be the same as the coordinates of the preset incident point, so that the light path corresponding to the selected candidate light spot pattern can meet the reentrant condition.
In practical application, after the optimal candidate light spot pattern is selected based on the candidate light spot pattern set meeting the reentrant condition, the incident point coordinates and the corresponding incident holes of the light rays are set based on the light ray path corresponding to the optimal candidate light spot pattern, so that the light rays can pass through each rectangular concave mirror from the Kong Sheru multi-reflecting air chamber and can be emitted from the original incident holes after being reflected for multiple times in the multi-reflecting air chamber.
In an embodiment of the present invention, the optical model may be an equation in which a straight line established based on the incident light ray and the spherical surfaces on which the first mirror surface and the second mirror surface (the plurality of rectangular concave mirrors) are located intersects with a circle. Wherein the incident light ray can be expressed as
Wherein
And
and respectively representing the incident point coordinate and the incident direction vector of the ith reflection. Four momentsThe centers of curvature of the concave mirrors can be expressed as:
substituting the incident ray equation into the spherical equation
In (1), an expression of a quadratic equation can be obtained:
wherein, a =1;
two roots can be obtained by solving the intersection equation of the straight line and the spherical surface, and a larger positive root is reserved:
therefore, we can find out the coordinates of the incident point of the (i + 1) th reflection, the normal vector, and the incident direction vector of the (i + 1) th reflection, which can be expressed by the following formulas (3) to (5), respectively:
according to the above stackGeneration relationship when
And r (i+1) ＝r (i) The light rays just pass through the original incident point position after being reflected for N times, the multi-gas-reflecting chamber with the structure can enable the light rays to be emitted from the incident Kong Sheru multi-gas-reflecting chamber and the original incident hole, namely, the incident point coordinate and the emergent point coordinate of the light rays are the same, and therefore the multi-gas-reflecting chamber meets the reentrant condition.
Fig. 4 shows a schematic diagram of forming a linear spot pattern on the first mirror surfaces (the first rectangular concave mirror M1 and the third rectangular concave mirror M3) according to one embodiment of the present invention. In this embodiment, the first distance d between the first mirror and the second mirror is 141mm. The second distance c is 0.5mm.
According to the path information of the light corresponding to the linear light spot pattern in fig. 4, the number of reflections is 44, and the coordinates of the emergent point are the same as those of the incident point, that is, the emergent light is emitted through the original incident hole. And the optical path length corresponding to the linear spot pattern is 6.2m.
Fig. 5 shows a schematic diagram of forming elliptical spot patterns on the first mirror surface (first rectangular concave mirror M1 and third rectangular concave mirror M3) and the second mirror surface (second rectangular concave mirror M2 and fourth rectangular concave mirror M4) according to one embodiment of the present invention. In this embodiment, the first distance d between the first mirror and the second mirror is 147mm. The second distance c is 1.4mm.
According to the path information of the light corresponding to the elliptical spot pattern in fig. 5, the number of reflections is 64, and the optical path corresponding to the linear spot pattern is 9.4m.
According to an embodiment of the invention, the predetermined shape may be a line shape, and the candidate spot pattern may include a line-shaped spot pattern. In step S350, after the spot pattern that conforms to the predetermined shape (line shape) and has the spot pitch within the predetermined spot pitch range is selected as the candidate spot pattern (line-shaped spot pattern), for each candidate spot pattern (line-shaped spot pattern), the candidate spot pattern may be further rotated by a predetermined angle around the center of the mirror surface on which the candidate spot pattern is located, so as to form the rotated line-shaped spot pattern. The rotated linear spot pattern may also be used as a candidate spot pattern.
For example, fig. 6 shows a schematic diagram of an X-shaped spot pattern formed by rotating the linear spot pattern shown in fig. 4 around the center of the mirror surface by a predetermined angle clockwise and counterclockwise, respectively. Here, the X-shaped spot pattern includes two linear spot patterns obtained by rotating the linear spot pattern around the center of the mirror surface thereof by predetermined angles in the clockwise direction and the counterclockwise direction, respectively.
It should be noted that the structural parameters of the multi-gas-reflecting cell shown in FIG. 6 (including the radius of curvature, the size, and the first distance between the first mirror and the second mirror) are the same as those of the multi-gas-reflecting cell of FIG. 4, which forms a single linear light spot pattern. The coordinate values of each spot in the rotated linear spot pattern can be obtained from the rotation angle (predetermined angle).
According to still another embodiment of the present invention, the predetermined shape may also be a combined shape formed by combining a plurality of single shapes, and the candidate spot patterns may include a combined spot pattern. For example, the combined shape may include a shape of a combination of multiple lines, a shape of a combination of lines and ellipses. Accordingly, the combined spot pattern may comprise: the light source comprises a multi-line-shaped combined light spot pattern formed by combining a plurality of line-shaped light spot patterns, and a line-shaped and oval-shaped combined light spot pattern formed by combining the line-shaped light spot pattern and the oval-shaped light spot pattern. The combined spot pattern is a multi-mode combined spot pattern. Accordingly, in step S350, the combined spot pattern may be selected as the candidate spot pattern.
It will be appreciated that the combined spot pattern comprises an X-shaped spot pattern, which is one implementation of a multi-line combined spot pattern. The X-shaped spot pattern shown in fig. 6 is a multi-line shaped combined spot pattern formed by combining two line-shaped spot patterns.
In addition, fig. 7 shows a schematic diagram of forming a linear and elliptical combined spot pattern on each of the rectangular concave mirrors of the first mirror surface and the second mirror surface according to one embodiment of the present invention. In this embodiment, the first distance d between the first mirror and the second mirror is 147mm, and the volume of the multi-reflecting chamber is 88.2cm 3 And the optical path corresponding to the linear light spot pattern is 9.4m, and the optical path corresponding to the elliptical light spot pattern is 3.1m.
According to the candidate light spot pattern set (including a plurality of light spot patterns with preset shapes) determined by the method 300 of the invention and the optical path corresponding to each candidate light spot pattern, a multi-gas-reflecting chamber can be designed, wherein the multi-gas-reflecting chamber comprises a first mirror surface and a second mirror surface which are symmetrically arranged, and the first mirror surface and the second mirror surface are respectively arranged at two sides of the multi-gas-reflecting chamber. The mirror surface parameters of the first mirror surface and the second mirror surface are the same, and the first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are spliced with each other. The light can be incident to the multiple reflection chambers from any one of the first mirror surface and the second mirror surface, sequentially traverses each rectangular concave mirror, and can be reflected for multiple times between the first mirror surface and the second mirror surface and then emitted. Finally, the light can form a light spot pattern with the same shape and a predetermined shape on each of the rectangular concave mirrors of the first mirror surface and the second mirror surface. And the light spot patterns formed on the first mirror surface and the second mirror surface are mutually symmetrical.
According to an embodiment of the invention, when multiple laser beams need to be injected into the multi-gas reflecting chamber to detect multiple gases, a combined light spot pattern meeting optical path conditions required by the multiple gases can be selected from candidate light spot patterns based on the optical path conditions required by the multiple gases, so that the multiple laser beams can be controlled to be injected into the multi-gas reflecting chamber according to path information corresponding to the combined light spot pattern to detect the multiple gases. Here, the combined spot pattern may include, for example, a multi-line combined spot pattern including an X-shaped spot pattern, a line-shaped and elliptical combined spot pattern. It is understood that the number of single-shaped spot patterns included in the combined spot pattern is determined according to the number of gas species and the number of lasers. For example, when 3 gases need to be detected, 3 lasers need to be injected into the multi-reflector cell, and accordingly, the combined spot pattern contains 3 single-shape spot patterns.
It should be noted that, path information such as an incident point, an incident angle and the like corresponding to each single-shaped spot pattern in the combined spot pattern can be determined according to the optical model, so that each laser beam can be controlled to be incident to the multi-reflection chamber from one of the incident points at the corresponding incident angle, and the corresponding gas can be detected through each laser beam, thereby realizing synchronous detection of multiple gases.
Specifically, based on the incident point coordinates corresponding to each single-shape light spot pattern in the selected combined light spot patterns, through opening the incident holes at the corresponding positions on the corresponding rectangular concave mirrors in the first mirror surface or the second mirror surface of the actual multi-gas-reflecting chamber, each laser beam is respectively incident into the Kong Sheru multi-gas-reflecting chamber. In addition, it is necessary to ensure that the spots formed on the first mirror surface and the second mirror surface by each laser beam do not coincide with all the incident holes, so as to prevent the light from being emitted from any incident hole during reflection.
That is, according to the multi-reflection chamber of an embodiment, the first mirror and the second mirror of the multi-reflection chamber may be provided with a plurality of incident holes. When multiple lasers are needed to detect multiple gases in the multi-gas-reflecting chamber, the lasers can be controlled to be respectively incident from the multiple incident holes and sequentially traverse each rectangular concave mirror, each laser is emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and each laser is respectively used for detecting one gas. Finally, the plurality of laser light beams may form a combined spot pattern on each of the rectangular concave mirrors of the first mirror and the second mirror. Each laser beam forms a single-shape light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface respectively, and a plurality of single-shape light spot patterns formed by the plurality of laser beams are combined to form a final combined light spot pattern.
Therefore, the multi-gas-reaction chamber can realize synchronous detection of a plurality of gases by a plurality of laser beams in the multi-gas-reaction chamber with smaller volume.
In one implementation, as shown in fig. 2a, the first mirror surface and the second mirror surface of the multi-reflector chamber respectively include two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side (along the x-axis direction). Specifically, the first mirror surface includes a first rectangular concave mirror M1 and a third rectangular concave mirror M3 which are spliced with each other. The second mirror surface comprises a second rectangular concave mirror M2 and a fourth rectangular concave mirror M4 which are spliced with each other. The second rectangular concave mirror and the first rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged, and the fourth rectangular concave mirror and the third rectangular concave mirror are the same in mirror surface parameters (curvature radius and size) and are symmetrically arranged.
According to the multi-gas-reflecting chamber in the embodiment, when two laser beams need to be emitted into the multi-gas-reflecting chamber to detect two gases, a combined light spot pattern meeting the optical path conditions required by the two gases can be selected from candidate light spot patterns based on the optical path conditions required by the detection of the two gases, so that the two laser beams are controlled to be emitted into the multi-gas-reflecting chamber according to the path information corresponding to the combined light spot pattern to detect the two gases.
It should be noted that when the required optical path conditions for the two gases are the same, the combined spot pattern selected from the candidate spot patterns may be an X-shaped spot pattern, as shown in fig. 6. When the two gases require different detection sensitivities and detection ranges, and different required optical path conditions, the combined spot pattern selected from the candidate spot patterns may be a linear and elliptical combined spot pattern, as shown in fig. 7.
In one implementation, as shown in fig. 6, based on the coordinates of the incident points corresponding to the two linear spot patterns in the selected X-shaped spot patterns, in order to facilitate the placement of the two groups of lasers and detectors, an incident hole may be formed at the corresponding position on the first mirror surface and the second mirror surface of the actual multi-reflector chamber, so that the two laser beams respectively enter the Kong Sheru multi-reflector chamber from the two incident points on the first mirror surface and the second mirror surface. For example, a first incident hole may be formed at a corresponding position on the first rectangular concave mirror M1 of the first mirror surface of the multi-reflector, and a second incident hole may be formed at a corresponding position on the fourth rectangular concave mirror M4 of the second mirror surface.
That is, according to the multi-chamber of the embodiment, the first mirror surface and the second mirror surface of the multi-chamber are respectively provided with the first incident hole and the second incident hole. When two kinds of gas in the multi-reflecting gas chamber need to be detected through two laser beams, the two laser beams can be controlled to respectively enter from the first entrance hole and the second entrance hole and sequentially traverse each rectangular concave mirror, each laser beam is emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and each laser beam is respectively used for detecting one kind of gas. Finally, as shown in fig. 6, the two lasers may form an X-shaped spot pattern on each of the rectangular concave mirrors of the first mirror surface and the second mirror surface (fig. 6 shows only the second rectangular concave mirror M2 and the fourth rectangular concave mirror M4 of the second mirror surface). And each laser beam forms a linear light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface respectively.
In this embodiment, the first distance between the first mirror and the second mirror is, for example, 141mm, and the volume of the multi-reflector chamber is only 81.2cm 3 . Wherein, the two laser beams can respectively form 6.2m optical paths. Therefore, according to the multi-gas-reflecting chamber, synchronous detection of two gases can be realized in a smaller volume.
In one implementation, when the two gases require different detection sensitivities and detection ranges, and different required optical path conditions, the combined spot pattern selected from the candidate spot patterns may be a linear and elliptical combined spot pattern, as shown in fig. 7. Based on the linear light spot pattern in the selected linear and elliptical combined light spot pattern and the incident point coordinates corresponding to the elliptical light spot pattern, in order to facilitate the arrangement of the two groups of lasers and detectors, an entrance hole can be respectively formed at the corresponding positions on the first mirror surface and the second mirror surface of the actual multi-gas-reflecting chamber, so that two beams of laser can respectively enter the Kong Sheru multi-gas-reflecting chamber from the two incident positions on the first mirror surface and the second mirror surface.
That is, according to the multi-chamber of the embodiment, the first mirror surface and the second mirror surface of the multi-chamber are respectively provided with the first incident hole and the second incident hole. When two kinds of gas in the multi-reflecting gas chamber need to be detected through two laser beams, the two laser beams can be controlled to respectively enter from the first entrance hole and the second entrance hole and sequentially traverse each rectangular concave mirror, each laser beam is emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and each laser beam is respectively used for detecting one kind of gas. Finally, as shown in fig. 7, the two lasers may form a combined linear and elliptical spot pattern on each of the rectangular concave mirrors of the first mirror and the second mirror. One laser beam forms a linear light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface, and the other laser beam forms an oval light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
In this embodiment, the first distance d between the first mirror and the second mirror is 147mm, and the volume of the multi-reflecting chamber is 88.2cm 3 And the optical path corresponding to the linear light spot pattern is 9.4m, and the optical path corresponding to the elliptical light spot pattern is 3.1m.
Fig. 8 and 9 respectively show schematic diagrams of a plurality of rectangular concave mirror surrounding arrangements according to one embodiment of the invention. As shown in fig. 8 and 9, the first mirror surface and the second mirror surface may include a plurality of rectangular concave mirrors spliced with each other and arranged circumferentially. That is, a plurality of rectangular concave mirrors on each side may be spliced together in a circular manner (end-to-end). By increasing the number of the rectangular concave mirrors, the types of the measured gas, the detection range and the detection precision can be increased. The number of the rectangular concave mirrors in the multi-reflecting-chamber, the corresponding optical path, the measuring range and the accuracy can be adjusted according to the actual measuring requirements.
The invention provides a method for determining a light spot pattern formed in a multi-gas-reflecting chamber, wherein an optical model of the multi-gas-reflecting chamber is established based on mirror surface parameters of a first mirror surface and a second mirror surface, and a first distance array is established for the distance between the first mirror surface and the second mirror surface based on a first distance interval. And constructing a second distance array for the distance between the projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the splicing position of the plurality of rectangular concave mirrors based on the second distance interval. And setting the coordinates of the incidence point of the light ray for each first distance value in the first distance array and each second distance value in the second distance array, and determining the light spot patterns formed on each rectangular concave mirror of the first mirror surface and the second mirror surface by the light ray according to the optical model. Therefore, a plurality of light spot patterns which can be formed in the multi-gas-reaction chamber can be determined, the light spot patterns which are in accordance with the preset shape and have the light spot space within the preset light spot space range are selected as candidate light spot patterns, a candidate light spot pattern set is generated based on all the candidate light spot patterns, and the optical path corresponding to each candidate light spot pattern can also be determined according to the optical model. Therefore, in the practical application process, the required optical path condition can be determined according to the detection sensitivity required when the gas is detected, and the optimal light spot pattern is selected from all candidate light spot patterns according to the required optical path condition, so that the detection sensitivity and the detection precision can be improved, and the detection requirements of different application scenes can be met.
Furthermore, the multi-gas reflecting chamber designed according to the method for determining the light spot pattern formed in the multi-gas reflecting chamber is small and compact in size, and each side mirror surface comprises a plurality of rectangular concave mirrors which are spliced with each other. Therefore, the multi-gas-reflecting chamber is more convenient to carry in practical application, and the gas can be detected more conveniently. Moreover, the designed multi-reflecting-chamber can realize that light rays sequentially traverse each rectangular concave mirror in the multi-reflecting-chamber and form a longer optical path after being reflected for multiple times on the premise of ensuring the stability of optical path transmission, so that the sensitivity and the precision of gas detection based on laser absorption spectrum are improved. According to different placing modes of the multiple gas reflecting chambers, such as side-by-side arrangement, surrounding arrangement and the like, the measurement requirements of different application scenes can be met.
In addition, according to the multi-gas-reflecting chamber of the present invention, by making a plurality of laser beams for detecting a plurality of gases incident to the multi-gas-reflecting chamber, the plurality of laser beams are emitted after being reflected a plurality of times between the mirror surfaces on both sides, and a combined spot pattern is formed on the mirror surfaces on both sides. Like this, can realize in the less many gas rooms that reflect of volume, carry out synchronous detection to multiple gas through many laser beams, improve the utilization ratio to many gas rooms that reflect and to the detection efficiency of gas.
The method A8 as in any one of the methods A1-A7, wherein the mutually spliced plurality of rectangular concave mirrors are arranged side by side or in a surrounding manner.
The method as claimed in any one of the A1-A8, wherein the first mirror surface and the second mirror surface respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; the first mirror surface comprises a first rectangular concave mirror and a third rectangular concave mirror which are spliced with each other; the distance between the projection point of the curvature center of the first rectangular concave mirror on the mirror surface along the optical axis direction and the splicing position of the two rectangular concave mirrors is a second distance; the second mirror surface includes second rectangle concave mirror and the fourth rectangle concave mirror of concatenation each other, the second rectangle concave mirror with the same and the symmetrical arrangement of mirror surface parameter of first rectangle concave mirror, the fourth rectangle concave mirror with the same and the symmetrical arrangement of mirror surface parameter of third rectangle concave mirror.
The method A10 is as described in any one of A1-A9, wherein when the curvature radius R of the rectangular concave mirror is 100mm, the first distance d is in the range of 10mm < d < 200mm, and the first distance interval is 0.1mm; the range of the second distance c is more than or equal to 0 and less than or equal to 3mm, and the interval of the second distance is 0.01mm.
A12, the multiple gas reflection chamber as described in a11, wherein the plurality of rectangular concave mirrors spliced with each other are arranged side by side or around.
A13, the multiple gas reflecting chamber as in a11 or a12, wherein the first mirror surface and the second mirror surface respectively comprise two rectangular concave mirrors spliced with each other, and the two rectangular concave mirrors are arranged side by side; wherein, first mirror surface includes first rectangle concave mirror and the third rectangle concave mirror of mutual concatenation, the second mirror surface includes second rectangle concave mirror and the fourth rectangle concave mirror of mutual concatenation, the second rectangle concave mirror with the same and symmetrical arrangement of mirror surface parameter of first rectangle concave mirror, the fourth rectangle concave mirror with the same and symmetrical arrangement of mirror surface parameter of third rectangle concave mirror.
A14, the multiple gas reaction chamber as claimed in any one of a11 to a13, wherein the predetermined shape is a line shape or an oval shape.
The method of any one of a11 to a13, wherein the predetermined shape includes a combined shape including a shape of a combination of multiple lines, a shape of a combination of lines and ellipses.
A16, the multiple gas reflecting chamber as in any one of A11-A15, wherein a plurality of penetrating holes are arranged on the first mirror surface and the second mirror surface; the laser beams are suitable for being incident from the incident holes and sequentially traversing each rectangular concave mirror, and are reflected between the first mirror surface and the second mirror surface for multiple times and then emitted, and the laser beams are suitable for forming a combined light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface; wherein each laser is adapted to detect one gas.
A17, the multi-gas-reflecting chamber is disclosed as A16, wherein the combined light spot pattern comprises an X-shaped light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are respectively suitable for being incident from the first incident hole and the second incident hole and sequentially traversing each rectangular concave mirror, are reflected for multiple times between the first mirror surface and the second mirror surface and then are emitted, and the two laser beams are suitable for forming an X-shaped light spot pattern on each rectangular concave mirror of the first mirror surface and the second mirror surface.
The multi-gas-reflecting chamber A18 is the multi-gas-reflecting chamber A16, wherein the combined light spot pattern comprises a linear combined light spot pattern and an elliptical combined light spot pattern, and the first mirror surface and the second mirror surface are respectively provided with a first incident hole and a second incident hole; the two laser beams are suitable for being incident from the first incident hole and the second incident hole and sequentially traversing each rectangular concave mirror, and are emitted after being reflected for multiple times between the first mirror surface and the second mirror surface, and the two laser beams are suitable for forming linear and elliptical combined light spot patterns on each rectangular concave mirror of the first mirror surface and the second mirror surface.
The various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present invention, or certain aspects or portions 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.
By way of example, and not limitation, readable media may comprise readable storage media and communication media. Readable storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of readable media.
In the description provided herein, algorithms and displays are not inherently related to any particular computer, virtual system, or other apparatus. Various general purpose systems may also be used with examples of 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.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features 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.
Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is for performing functions performed by the elements for the purpose of carrying out the invention.
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.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as disclosed herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense with respect to the scope of the invention, as defined in the appended claims.
Claims (10)
1. A method, implemented in a computing device, of determining a pattern of light spots formed within a multi-reflector chamber, the multi-reflector chamber including first and second mirror surfaces having the same mirror surface parameters and being symmetrically arranged, the first and second mirror surfaces respectively including a plurality of rectangular concave mirrors spliced to each other, a light ray adapted to be incident from any one of the rectangular concave mirrors and to sequentially traverse each of the rectangular concave mirrors and to be reflected off the first and second mirror surfaces after being reflected a plurality of times, the light ray adapted to form a pattern of light spots of the same shape on each of the rectangular concave mirrors of the first and second mirror surfaces, the method comprising:
determining mirror surface parameters of the first mirror surface and the second mirror surface, and establishing an optical model of a plurality of gas reflecting chambers based on the mirror surface parameters;
defining the distance between the first mirror surface and the second mirror surface as a first distance, setting the range of the first distance, and constructing a first distance array for the first distance based on a first distance interval;
defining a projection point of the curvature center of the rectangular concave mirror on the mirror surface along the optical axis direction and the distance between the projection point and the splicing position of the plurality of rectangular concave mirrors as a second distance, setting the range of the second distance, and constructing a second distance array for the second distance based on a second distance interval;
setting the coordinates of a preset incidence point of a ray to be incident from each first distance value in the first distance array and each second distance value in the second distance array, and determining a light spot pattern formed on each rectangular concave mirror of the first mirror surface and the second mirror surface by the ray according to the optical model;
selecting a light spot pattern which is in accordance with a preset shape and has a light spot spacing within a preset light spot spacing range as a candidate light spot pattern, and generating a candidate light spot pattern set based on all the candidate light spot patterns;
and determining the optical path corresponding to each candidate light spot pattern according to the optical model so as to select the candidate light spot pattern meeting the preset optical path condition as the optimal light spot pattern.
2. The method of claim 1, wherein setting the light ray to be incident from a predetermined incident point coordinate 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.
3. The method of claim 1 or 2, wherein setting the light ray to be incident from a predetermined incident point coordinate comprises:
constructing a coordinate array of a preset incidence point based on the preset coordinate difference value;
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.
4. The method of any one of claims 1-3, wherein determining from the optical model a spot pattern that the light rays form on each of the rectangular concave mirrors of the first and second mirror surfaces comprises:
and determining the path of the light ray in the multi-gas reflecting chamber according to the optical model, wherein the path information comprises each light spot formed by the light ray on each rectangular concave mirror.
5. The method of claim 4, wherein the path information further includes coordinates of an exit point of the light, and selecting a spot pattern conforming to a predetermined shape and having a spot pitch within a predetermined range of spot pitches as a candidate spot pattern comprises:
and selecting a spot pattern which accords with a preset shape, has a spot spacing within a preset spot spacing range, and has the same coordinates of an emergent point and a preset incident point as a candidate spot pattern.
6. The method of any one of claims 1-5,
the predetermined shape includes a line shape or an ellipse shape, and the candidate spot pattern includes a line-shaped spot pattern or an ellipse-shaped spot pattern.
7. The method of any one of claims 1-6,
the predetermined shape comprises a composite shape comprising a shape of a combination of multiple lines, a shape of a combination of lines and an ellipse;
the candidate spot patterns include a multi-line combined spot pattern, a line-shaped combined spot pattern, and an elliptical combined spot pattern.
8. A multiple gas-reflector cell comprising first and second mirror surfaces of identical mirror surface parameters and arranged symmetrically, wherein:
the first mirror surface and the second mirror surface respectively comprise a plurality of rectangular concave mirrors which are spliced with each other, wherein at least one rectangular concave mirror is provided with an incident hole;
the light rays incident through the incident hole are suitable for sequentially traversing each rectangular concave mirror, are reflected for multiple times between the first mirror surface and the second mirror surface and then are emitted, and the light rays are suitable for forming a light spot pattern with a preset shape on each rectangular concave mirror of the first mirror surface and the second mirror surface.
9. A computing device, comprising:
at least one processor; and
a memory storing program instructions configured for execution by the at least one processor, the program instructions comprising instructions for performing the method of any of claims 1-7.
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 1-7.
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