阅读说明：本技术 一种多光谱线温高温测量装置和方法 (Multispectral line temperature high-temperature measuring device and method ) 是由 邢键 常馨方 于 2021-09-08 设计创作，主要内容包括：本发明提出一种多光谱线温高温测量装置和方法,属于多光谱测温技术领域。一种多光谱线温高温测量装置,包括透镜组、狭缝、正交柱状透镜组、倒置的扩束系统、组合分光棱镜、暗箱透镜、反射镜和线阵探测器阵列；被测物体发出混合热辐射光谱,经过透镜组进行光线的汇聚,汇聚后的光线通过狭缝发散经正交柱状透镜组、倒置的扩束系统和组合分光棱镜射入暗箱透镜,所述组合分光棱镜把不同类型的组合光进行分开,暗箱透镜将分开的光中具有同色的光汇聚,再通过反射镜将波长信息分量投射到探测器阵列上,获取待测物体的位置信息和光谱信息；使每个光斑的长宽都限制在了探测器的尺寸内。解决了分布式线温高温测量产生相差影响测量不精准的问题。(The invention provides a multispectral linear temperature high-temperature measuring device and a multispectral linear temperature high-temperature measuring method, and belongs to the technical field of multispectral temperature measurement. A multispectral linear temperature high-temperature measuring device comprises a lens group, a slit, an orthogonal cylindrical lens group, an inverted beam expanding system, a combined beam splitter prism, a dark box lens, a reflector and a linear array detector array; the method comprises the following steps that a tested object emits mixed thermal radiation spectrum, light is converged through a lens group, the converged light is diffused through a slit and is emitted into a camera bellows lens through an orthogonal cylindrical lens group, an inverted beam expanding system and a combined beam splitter prism, the combined beam splitter prism separates different types of combined light, the camera bellows lens converges the light with the same color in the separated light, and wavelength information components are projected onto a detector array through a reflector to obtain position information and spectrum information of the tested object; the length and width of each light spot are limited in the size of the detector. The problem of distributed line temperature high temperature measurement produce the phase difference influence and measure inaccurate is solved.)

1. A multispectral linear temperature high-temperature measuring device is characterized by comprising a lens group (L1), a slit (T), an orthogonal cylindrical lens group (L2), a combined beam splitter prism (P), a dark box lens (L4), a reflector (M) and a linear array detector array (A);

the lens group (L1), the slit (T), the orthogonal cylindrical lens group (L2), the combined beam splitter prism (P), the dark box lens (L4), the reflector (M) and the linear array detector array (A) are arranged in sequence;

the multi-spectrum linear temperature pyrometer has the optical path: the device comprises a detector array (A), a lens group (L1), a slit (T), a dark box lens (L4), a reflector (M), a light splitting lens (L4), a light splitting lens (L2), a light splitting lens (L3526), a light splitting lens (L4), a light splitting lens (L3578), a light splitting lens (L2), a light splitting lens (L3526), a light splitting lens (L4), a light splitting lens (M), a wavelength information component and a light splitting lens (M), wherein the light splitting lens (L4) is used for splitting the light splitting lens, and the wavelength information component is projected onto the detector array (A), so that the position information and the spectrum information of a measured object are obtained;

the number of the linear array detector arrays (A) is multiple.

2. The multi-spectral line temperature pyrometry apparatus according to claim 1, further comprising an inverted beam expanding system (L3), wherein the inverted beam expanding system (L3) is disposed on the optical path between the cross-cylindrical lens group (L2) and the combined beam splitter prism (P), and the inverted beam expanding system (L3) converges the object beam more closely to reduce the loss of radiation information.

3. The multi-spectral line temperature pyrometry apparatus according to claim 2, wherein the lens assembly (L1) comprises a first lens and a second lens, the first lens and the second lens are disposed opposite to each other, and the direction of the light is adjusted by adjusting the distance between the first lens and the second lens.

4. The multi-spectral line temperature pyrometry apparatus according to claim 3, wherein the orthogonal cylindrical lens group (L2) comprises a first cylindrical prism and a second cylindrical prism, the first cylindrical prism and the second cylindrical prism are vertically arranged, and the distance between the first cylindrical prism and the second cylindrical prism is adjusted to counteract the phase difference caused by the beam splitter prism (P) and the dark box lens (L4), so that the length of the light spot is consistent with the length of the detector.

5. The multispectral linear temperature pyrometric device according to claim 4, wherein the combined beam splitter prism (P) comprises a first prism, a second prism and a third prism, the incident surface of the first prism is the incident surface of the combined beam splitter prism (P), the emergent surface of the first prism is tightly connected with the incident surface of the second prism, and the emergent surface of the second prism is tightly connected with the incident surface of the third prism.

6. The multi-spectral line temperature pyrometry apparatus of claim 5 wherein the focal length of the lens group (L1) is 210mm, the focal length of the orthogonal cylindrical lens group (L2) is 30mm, and the focal length of the dark box lens (L4) is 420 mm; the focal length of the inverted beam expanding system (L3) was 20 mm.

7. The multi-spectral line temperature pyrometry apparatus according to claim 6, wherein the distance between the lens group (L1) and the slit (T) is 210 mm;

the distance between the slit (T) and the orthogonal cylindrical lens group (L2) is 40 mm;

the included angle of the optical axis between the orthogonal cylindrical lens group (L2) and the combined beam splitter prism (P) is 18.5 degrees;

the distance between the orthogonal cylindrical lens group (L2) and the inverted beam expanding system (L3) is 50 mm;

the distance between the inverted beam expanding system (L3) and the combining beam splitter prism (P) is 40 mm;

an optical axis included angle between the combined beam splitter prism (P) and the camera obscura lens (L4) is 20.7 degrees;

the distance between the camera bellows lens (L4) and the reflector (M) is 70 mm;

the distance between the reflector (M) and the linear array detector array (A) is 313 mm.

8. The multi-spectral line temperature pyrometry apparatus of claim 7 wherein the set of orthogonal cylindrical lenses (L2) is replaced with a set of orthogonal double cylinders.

9. The multi-spectral line temperature pyrometry apparatus of claim 8 wherein the orthogonal cylindrical lens group (L2) is replaced with a single semi-cylindrical lens.

10. A multispectral linear temperature high-temperature measurement method is characterized in that a lens group (L1) is placed at a measured object, so that the measured object emits mixed thermal radiation spectrum, light is converged by the lens group (L1) and then is diffused by a slit (T), phase difference is offset by an orthogonal cylindrical lens group (L2), the light energy is improved by convergence of an inverted beam expanding system (L3), loss of radiation information is reduced, different types of combined light are separated by a combined beam splitter prism (P), the separated light is emitted into a dark box lens (L4), the dark box lens (L4) converges light with the same color in the separated light, and then wavelength information components are projected onto a detector array (A) through a reflector (M), and therefore position information and spectrum information of the measured object are obtained.

Technical Field

The application relates to a line temperature high-temperature measuring device, in particular to a multispectral line temperature high-temperature measuring device and a multispectral line temperature high-temperature measuring method, and belongs to the technical field of multispectral temperature measurement.

Background

The multi-wavelength radiation thermometry is one of the most powerful tools for high temperature target measurement. The method utilizes multispectral radiometric information of a target to obtain the true temperature of the target and the spectral emissivity of the material through data processing, so that the accurate spectral wavelength value and spectral radiometric information of each spectral channel are the key points of the data processing.

At present, the multispectral pyrometer is still limited to single-point temperature measurement, and if the line temperature is measured by adopting the optical path, distortion is generated, so that the radiation energy received by a detector is influenced. Distributed linear temperature measurement also has a great deal of practical requirements in the fields of industrial application, such as welding, rocket engine tail jet flame temperature distribution and the like, and therefore a multi-spectrum linear temperature pyrometer needs to be developed. The linear temperature pyrometer needs to transmit all radiation information on one line of a measured target to a detector accurately by using one optical path. If the multispectral pyrometer for measuring single points is directly combined in multiple points, after passing through the objective lens group, the off-axis part generates serious aberration such as distortion (refer to fig. 6 to 7) caused by different distances between the measured point and the optical axis, and the serious aberration is difficult to be matched with the detector array unit.

Therefore, the invention provides a multispectral linear temperature high-temperature measuring device and a multispectral linear temperature high-temperature measuring method, which can greatly reduce the influence of aberration on measurement.

Disclosure of Invention

The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

In view of the above, in order to solve the technical problem that the measurement is not accurate due to the influence of phase difference generated by distributed line temperature high-temperature measurement in the prior art, the invention provides a multispectral line temperature high-temperature measurement device, which comprises a lens group, a slit, an orthogonal cylindrical lens group, a combined beam splitter prism, a dark box lens, a reflector and a linear array detector array;

the lens group, the slit, the orthogonal cylindrical lens group, the combined beam splitter prism, the dark box lens, the reflector and the linear array detector array are sequentially arranged;

the multi-spectrum linear temperature pyrometer has the optical path: the method comprises the steps that a measured object emits mixed thermal radiation spectrum, light is converged through a lens group, the converged light is diffused through a slit and is emitted into a dark box lens through an orthogonal cylindrical lens group and a combined beam splitter prism, the combined beam splitter prism separates different types of combined light, the dark box lens converges light with the same color in the separated light, and wavelength information components are projected onto a detector array through a reflector, so that position information and spectrum information of the measured object are obtained;

the number of the linear array detectors is multiple.

Preferably, the system further comprises an inverted beam expanding system, the inverted beam expanding system is arranged on the light path between the cross-cylindrical lens group and the combined beam splitter prism, and the inverted beam expanding system converges the target light beam more tightly, so that the loss of radiation information can be reduced.

Preferably, the lens group includes a first lens and a second lens, the first lens and the second lens are arranged oppositely, and the direction of the light is adjusted by adjusting the distance between the first lens and the second lens.

Preferably, the orthogonal cylindrical lens group comprises a first cylindrical prism and a second cylindrical prism, the first cylindrical prism and the second cylindrical prism are vertically arranged, and the distance between the first cylindrical prism and the second cylindrical prism is adjusted to offset the phase difference caused by the beam splitter prism and the dark box lens, so that the length of the light spot is consistent with the length of the detector.

Preferably, the combined beam splitter prism includes a first prism, a second prism and a third prism, the incident surface of the first prism is the incident surface of the combined beam splitter prism, the emergent surface of the first prism is closely connected with the incident surface of the second prism, and the emergent surface of the second prism is closely connected with the incident surface of the third prism.

Preferably, the focal length of the lens group is 210mm, the focal length of the orthogonal cylindrical lens group is 30mm, and the focal length of the dark box lens is 420 mm; the focal length of the inverted beam expanding system is 20 mm.

Preferably, the distance between the lens group and the slit is 210 mm;

the distance between the slit and the orthogonal cylindrical lens group is 40 mm;

the included angle of the optical axis between the orthogonal cylindrical lens group and the combined beam splitter prism is 18.5 degrees;

the distance between the orthogonal cylindrical lens group and the inverted beam expanding system is 50 mm;

the distance between the inverted beam expanding system and the combined beam splitting prism is 40 mm;

an included angle of an optical axis between the combined beam splitter prism and the camera obscura lens is 20.7 degrees;

the distance between the camera obscura lens and the reflector is 70 mm;

the distance between the reflector and the linear array detector array is 313 mm.

Preferably, the orthogonal cylindrical lens group is replaced by an orthogonal double cylindrical lens group.

Preferably, the orthogonal cylindrical lens group is replaced with a single semi-cylindrical lens.

A multispectral line temperature high-temperature measurement method comprises the steps of placing a lens group at a measured object to enable the measured object to emit mixed thermal radiation spectrum, converging light rays through the lens group, then diverging the light rays through a slit, further offsetting phase difference through an orthogonal cylindrical lens group, converging the light rays through an inverted beam expanding system to improve energy of the light rays and reduce loss of radiation information, separating different types of combined light rays through a combined beam splitter prism, enabling the separated light rays to enter a dark box lens, converging the light rays with the same color in the separated light rays through the dark box lens, and projecting wavelength information components onto a detector array through a reflector, so that position information and spectrum information of the measured object are obtained.

The invention has the following beneficial effects: the invention can adjust the focal length of the main objective lens according to the object distance by adding the lens group, so that the imaging is clearer, and the orthogonal cylindrical lens group is added, so that the length and the width of each light spot are limited within the size of the detector, the aberration is eliminated more ideally, and the more ideal imaging effect is achieved. And the target light beams are converged more tightly through the inverted beam expanding system, so that the light energy is improved, and the detector can better receive the radiation energy information. The method solves the technical problem that the measurement is not accurate due to the fact that phase difference is generated in distributed line temperature high-temperature measurement in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a light beam being imaged through a lens assembly according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating an imaging effect of an orthogonal cylindrical lens assembly according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating an imaging effect of an orthogonal double-cylinder lens assembly according to an embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating an imaging effect of a single semi-cylindrical lens group according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating comparison between the prior art and the present invention according to the embodiment of the present invention; wherein (a) is a schematic diagram of the effect of a conventional pyrometer optical path in the presence of distortion; (b) is a schematic diagram of the effect of the undistorted pyrometer optical path of the present invention;

fig. 7 is a schematic structural diagram illustrating a problem in the prior art according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Example 1, the present embodiment is described with reference to fig. 1 to 7, and a multispectral linear temperature pyrometric device of this embodiment includes a lens group L1, a slit T, an orthogonal cylindrical lens group L2, a combined beam splitter prism P, a dark box lens L4, a reflector M, and a linear detector array a;

the lens group L1, the slit T, the orthogonal cylindrical lens group L2, the combined beam splitter prism P, the black box lens L4, the reflector M and the linear array detector array A are sequentially arranged;

the multi-spectrum linear temperature pyrometer has the optical path: the method comprises the steps that a measured object emits mixed thermal radiation spectrum, light is converged through a lens group L1, the converged light is diverged through a slit T and is incident into a dark box lens L4 through an orthogonal cylindrical lens group L2 and a combined beam splitter prism P, the combined beam splitter prism P separates different types of combined light, the dark box lens L4 converges light with the same color in the separated light, and wavelength information components are projected onto a detector array A through a reflector M, so that position information and spectrum information of the measured object are obtained;

the number of the linear array detector arrays A is multiple.

Specifically, the lens group L1 includes a first lens and a second lens, the first lens is disposed opposite to the second lens, and the direction of the light is adjusted by adjusting the distance between the first lens and the second lens. The focal length of the lens group L1 is 210mm, and the distance between the lens group L1 and the slit T is 210 mm;

specifically, the first lens includes a first convex lens and a second convex lens; the second lens is a concave lens, and the concave lens is arranged in the middle of the first convex lens and the second convex lens; the distance between the first convex lens and the concave lens is 5.51 mm; the distance between the concave lens and the second convex lens is 11 mm;

specifically, the lens group L1 is arranged at the position of the object to be measured, and the mixed heat radiation spectrum emitted by the object to be measured is absorbed into the first lens and emitted out through the second lens to form light convergence.

Specifically, the lens group L1 is a positive-negative combination lens.

Specifically, the light rays are converged through the lens group L1, so that the chromatic dispersion and spherical aberration generated by the transmission of the far axis can be reduced, the measured target in a certain distance range is imaged, and ideal imaging of a plurality of points at any distance in the range is realized by adjusting the distance between the lenses, so that the ideal imaging is realized, and the ideal imaging corresponds to the object plane in a one-to-one scaling manner.

Specifically, the converged light is diffused by the slit T and then is incident on the orthogonal cylindrical lens group L2. The distance between the slit T and the orthogonal cylindrical lens group L2 is 40 mm;

specifically, the orthogonal cylindrical lens group L2 includes a first cylindrical prism and a second cylindrical prism, the first cylindrical prism and the second cylindrical prism are vertically disposed, and a phase difference caused by the beam splitter prism P and the dark box lens L4 is offset by adjusting a distance between the first cylindrical prism and the second cylindrical prism, so that the length of the light spot is consistent with the length of the detector. The focal length of the orthogonal cylindrical lens group L2 is 30mm, and the optical axis included angle between the orthogonal cylindrical lens group L2 and the combined beam splitter prism P is 18.5 degrees;

specifically, light after being diffused through the slit T is shot into the first cylindrical prism and is emitted out through the second cylindrical prism, the mutually perpendicular cylindrical prisms play a role in beam spot radiation, aberration caused by the beam splitter prism and the dark box lens is offset by adjusting parameters such as the distance between the first cylindrical prism and the second cylindrical prism, the length of the beam spot is consistent with the length of the detector, and therefore all wavelength information of the narrow-band beam spot can be completely collected.

Referring to fig. 3, the imaging effect diagram shown in fig. 3 is from inside to outside, and the widths of the narrow-band strip-shaped light spots are respectively: 0.4404mm, 0.4139mm, 0.3147mm and 0.2330 mm. When the light spot changes from a 0 view field to an outward large view field, the width of the light spot tends to be smaller and smaller, because the image plane is manually adjusted when being selected, the light spot imaging in the 0 view field is not the best, but the position of the image plane is changed in order to balance the width of the light spot imaging in the large view field. The length and the width of each light spot are limited within the size of the detector, the length and the width data are good, and a good imaging effect is achieved.

Specifically, the combined beam splitter prism P includes a first prism, a second prism and a third prism, the incident surface of the first prism is the incident surface of the combined beam splitter prism P, the emergent surface of the first prism is tightly connected with the incident surface of the second prism, and the emergent surface of the second prism is tightly connected with the incident surface of the third prism.

Specifically, light emitted from the orthogonal cylindrical lens group L2 passes through the combined beam splitter prism P, and the combined beam splitter prism P splits the different types of incident combined light and emits the split combined light into the dark fragrance lens L3; the focal length of the camera obscura lens L4 is 420 mm; an included angle of an optical axis between the combined beam splitter prism P and the camera obscura lens L4 is 25 degrees;

in particular, the different types of combined light are in particular light emanating from the thermal radiation of the object to be measured.

Specifically, the dark box lens L4 converges lights having the same color in the separated lights, and projects wavelength information components onto the detector array a through the reflector M, thereby acquiring position information and spectral information of the object to be measured; the distance between the camera bellows lens L4 and the reflector M is 70 mm; the distance between the reflector M and the linear array detector array A is 313 mm.

Specifically, the orthogonal cylindrical lens group L2 is replaced with an orthogonal double cylindrical group.

Specifically, the orthogonal cylindrical lens group L2 is substituted for a single semi-cylindrical lens.

Specifically, the orthogonal cylindrical lens group L2 is a main objective lens of the optical path structure of the whole device, and can adjust the focal length within the expected specified distance range, so as to facilitate the device to measure objects with different distances. And after the objective lens is adjusted, the cross fork with the same distance with the target can be clearly seen on the eyepiece, and then the focusing process is finished.

Embodiment 2, the multispectral linear temperature pyrometric device according to this embodiment is described with reference to fig. 1, which includes a lens group L1, a slit T, an orthogonal cylindrical lens group L2, a combined beam splitter prism P, a dark box lens L4, a reflector M, and a linear array detector array a;

the lens group L1, the slit T, the orthogonal cylindrical lens group L2, the inverted beam expanding system L3, the combined beam splitter prism P, the dark box lens L4, the reflector M and the linear array detector array A are sequentially arranged;

the multi-spectrum linear temperature pyrometer has the optical path: the object to be measured emits mixed thermal radiation spectrum, light is converged through the lens group L1, the converged light is diverged through the slit T and passes through the orthogonal cylindrical lens group L2, the orthogonal cylindrical lens group L2 offsets phase difference, and the converged light passes through the inverted beam expanding system L3, so that the energy of the light is improved, and the loss of radiation information is reduced; the combined light of different types is split by the combined beam splitter prism P and then is emitted into a black box lens L4, the black box lens L4 converges the light with the same color in the split light, and the wavelength information component is projected onto the detector array A by the reflector M, so that the position information and the spectrum information of the object to be detected are obtained;

the number of the linear array detector arrays A is multiple.

Specifically, the lens group L1 includes a first lens and a second lens, the first lens and the second lens are disposed opposite to each other, and the direction of the light is adjusted by adjusting the distance between the first lens and the second lens.

The orthogonal cylindrical lens group L12 comprises a first cylindrical prism and a second cylindrical prism, the first cylindrical prism and the second cylindrical prism are vertically arranged, and the phase difference caused by the beam splitter prism and the dark box lens is offset by adjusting the distance between the first cylindrical prism and the second cylindrical prism, so that the length of the light spot is consistent with the length of the detector.

The distance between the first cylindrical prism and the second cylindrical prism is 11.5 mm;

the combined beam splitter prism P comprises a first prism, a second prism and a third prism, wherein the incident surface of the first prism is the incident surface of the combined beam splitter prism P, the emergent surface of the first prism is tightly connected with the incident surface of the second prism, and the emergent surface of the second prism is tightly connected with the incident surface of the third prism.

The inverted beam expanding system L13 includes a plano-convex cylindrical mirror and a concave lens; the incident plane of the plano-convex cylindrical mirror is the incident plane of the inverted beam expanding system L13, the plano-convex cylindrical mirror and the concave lens are arranged in parallel, light beams are focused on the virtual focus through the input mirror to output parallel light, and then the parallel light passes through the concave lens to realize the compression of the divergence angle of the light beams and reduce the size of light spots. The larger the diameter of the received beam, the smaller the spot size. The inversion of the beam expanding system is to reduce the diameter of a light beam, compress the spatial divergence angle of the light beam and obtain higher energy density, so that the expanded light beam meets the requirements of the system and transmits certain wavelength information. So that the final imaged spot meets the requirements of the detector.

The distance between the plano-convex cylindrical lens and the concave lens is 50 mm;

the focal length of the lens group is 210mm, the focal length of the orthogonal cylindrical lens group is 30mm, and the focal length of the lens of the dark box is 420 mm; the focal length of the inverted beam expanding system is 20 mm.

The distance between the lens group and the slit is 210 mm;

the distance between the slit and the orthogonal cylindrical lens group is 40 mm;

the included angle of the optical axis between the orthogonal cylindrical lens group and the combined beam splitter prism is 18.5 degrees;

the distance between the orthogonal cylindrical lens group and the inverted beam expanding system is 50 mm;

the distance between the inverted beam expanding system and the combined beam splitting prism is 40 mm;

an included angle of an optical axis between the combined beam splitter prism and the camera obscura lens is 20.7 degrees;

the distance between the camera obscura lens and the reflector is 70 mm;

the distance between the reflector and the linear array detector array is 313 mm.

Specifically, the inverted beam expanding system L3 can widen or divide a single light beam of a target to be measured into a plurality of light beams, and since the information extraction of each wavelength is very troublesome or unorganized if there is only one target light beam, we need to disperse the single target light beam, and the broadening or dispersion system can have various modes, and for broadening, a prism can be used; while for dispersion we can use a bundle of rays; or they may be separated in time so that the target light within each time interval is dedicated to propagating a certain wavelength of information.

Three structures of the orthogonal cylindrical lens group L2 were subjected to simulation experiments:

embodiment 3, the embodiment is described with reference to fig. 1, and the multispectral linear temperature pyrometric method of the embodiment includes placing a lens group L1 at a measured object, so that the measured object emits a mixed thermal radiation spectrum, converging light rays through the lens group L1, diverging the light rays through a slit T, offsetting a phase difference through an orthogonal cylindrical lens group L2, separating different types of combined light through a combined beam splitter prism P, introducing the separated light rays into a dark box lens L4, converging light rays with the same color in the separated light rays through the dark box lens L4, and projecting wavelength information components onto a detector array a through a reflector M, thereby obtaining position information and spectral information of the measured object.

The simulation results of the orthogonal double cylindrical sets are illustrated with reference to fig. 4, and it can be seen from the figure that for the imaging result of the small field of view, the required strip-shaped narrow-band light spot is obtained, the light spot width of the 0 field of view is 0.022mm, and the light spot width at the maximum field of view is 0.0092 mm.

The simulation results of a single semi-cylindrical lens are illustrated with reference to fig. 5, from which it can be seen that the imaged shape of each spot is good. The size of the light spot of a certain field of view is observed by closing other fields of view, and the widths of the light spots of the outward field of view from the center of the circle along the diameter are respectively 0.003mm, 0.0127mm, 0.0512mm and 0.1021 mm. The detector width is 0.9mm, so the spot width is much smaller than the detector specified width.

The simulation result of the orthogonal cylindrical lens group L2 is described with reference to fig. 3, and it can be seen from the figure that the spot bending phenomenon disappears, and the aberration caused by the beam splitter prism and the dark box lens is offset by adjusting the parameters such as the distance between the orthogonal cylindrical lenses, so that the length of the spot is consistent with the length of the detector, and the information of each wavelength of the narrow-band spot can be completely collected. From inside to outside, the narrow-band strip-shaped light spot width is respectively: 0.4404mm, 0.4139mm, 0.3147mm and 0.2330 mm. When the light spot changes from 0 view field to outside large view field, the position of the image surface is changed, and the width of the light spot imaging of the large view field is balanced. It can be seen that the length and width of each spot are limited within the size of the detector, and the imaging effect is the best.

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 described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.