View field merging method and device of optical spectrum instrument

Abstract

The invention relates to a field-of-view combining method and device of a spectrum instrument, and relates to the technical field of multi-optical-path beam combination. The device comprises a split-caliber flat plate type prism; the sub-aperture flat plate type prism comprises at least one transmission area and at least one reflection area. A reflecting surface is arranged at the position where the reflecting area is connected with the transmitting area; a spectrograph slit area or an area-array camera focal plane area is arranged below each transmission area and each reflection area respectively; and a plurality of spectrometer slit areas or area-array camera focal plane areas are connected in series in the length direction. The target light and the illumination light are connected in series in the length direction of the slit of the spectrometer by using the field-of-view merging technology based on the split-aperture flat-plate prism, the field-of-view merging of the target light and the illumination light is realized, then the target light and the illumination light enter the same spectrometer and are imaged on the same focal plane detector, and the target light and the illumination light are integrated at each integral time. And the target light and the illumination light are output to the same frame of image, so that the target light and the illumination light are synchronously measured in a common-light-path and common-reference manner.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of multi-optical path beam combining technology, in particular to a field-of-view merging method and device for a spectral instrument. BACKGROUND

[0002] Whether imaging or non-imaging, multispectral or hyperspectral, as a quantitative detection instrument, spectral instruments ultimately need to convert the radiance data obtained by the instrument into reflectance / transmittance data of the target. In actual target measurement process, even if the reflectance / transmittance of the target is unchanged, if the brightness of the illumination light source changes, the radiance of the target reflection / transmission obtained by the spectral instrument will also change, and high-precision, synchronous measurement of the illumination light is a key and difficult point in the field of spectral instruments.

[0003] Currently, in the fields of spectrophotometer, fiber spectrometer, ground object spectrometer, imaging spectrometer, etc., in order to obtain the reflectance / transmittance data of the target with high precision, the following technical means are commonly used:

[0004] (1) Step-by-step direct measurement method: This method belongs to the common reference, relative measurement method. Assuming that the radiance of the light source remains stable, the radiance of the light source is first directly or indirectly measured, and then the radiance of the target is measured, and then the reflectance / transmittance of the target is calculated. For example, before measuring the sample, the spectrophotometer is preheated to a stable light source, then the “empty measurement” is performed without placing the test piece, then the test piece is placed in the light path for measurement, and the transmittance / reflectance is obtained by the ratio of the two measurement data. Before measuring the target, the ground object spectrometer is preheated to a stable state, then the reflectance data of the standard reflectance plate is tested, and then the reflectance data of the target is tested, and the reflectance of the target is obtained by the ratio of the two measurement data.

[0005] (2) Standard plate transfer method: This method belongs to the non-common reference, relative measurement method. Assuming that the radiance of the light source fluctuates, the transmittance / reflectance of the standard plate under the illumination of the light source is first tested, then the relative change of the light source is monitored while measuring the radiance of the target, and then the transmittance / reflectance of the target is calculated. For example, in the field of unmanned aerial vehicle spectral remote sensing, even in good weather, the light intensity incident on the ground object target will change due to the change of the sun's high angle, so generally the spectral camera first shoots the standard plate before the unmanned aerial vehicle takes off, and the downlink light sensor synchronously obtains the solar intensity data at different times for subsequent data correction.

[0006] (3) Multi-instrument cooperative observation method: this method belongs to non-common reference, absolute measurement method. The actual data acquisition spectrometer works at the same time, as a reference standard spectrometer synchronous acquisition of absolute spectral radiometric data of light source, according to the incident light, the outcoming light data using transmittance / reflection calculation formula strictly calculate the transmittance / reflection of the target. Multi-instrument cooperative observation method cost is higher, use cumbersome, generally only in high precision quantitative measurement field, less application in the field of remote sensing.

[0007] In summary, the prior art means whether absolute measurement method or relative measurement method, can not meet the requirements of the common path, common reference and synchronous measurement of target light and illumination light, significantly increases the measurement error, measurement efficiency and instrument cost of the spectrometer. SUMMARY

[0008] The present application solves the technical problems in the prior art, and provides a field of view merging method and device of a spectrometer.

[0009] In order to solve the above technical problems, the technical scheme of the present application is as follows:

[0010] A field of view merging device of a spectrometer, comprising: a split-aperture flat prism;

[0011] The split-aperture flat prism comprises at least one transmission area and at least one reflection area connected to each other; a reflection surface is provided at the position where the reflection area is connected to the transmission area; the reflection surface is used to reflect the illumination light to be emitted downward;

[0012] Each of the transmission area and each of the reflection area is provided with a spectrometer slit area or a focal plane area of a face array camera below; a plurality of spectrometer slit areas or focal plane areas of face array cameras are connected in series in the length direction of the split-aperture flat prism;

[0013] The transmission area of the split-aperture flat prism is used to make the target light incident and transmit into the spectrometer slit area or the focal plane area of the face array camera below the transmission area;

[0014] The reflection area of the split-aperture flat prism is used to make the illumination light incident and reflect into the spectrometer slit area or the focal plane area of the face array camera below the reflection area after being reflected by the reflection surface.

[0015] In the above technical scheme, at least one of the transmission area or at least one of the reflection area is a gap.

[0016] In the above technical scheme, the spectrometer slit area is provided with:

[0017] One or more face array detectors, or

[0018] One or more single-line array detectors, or

[0019] Single or multiple multi-linear array detectors.

[0020] In the above technical solution, the sum of the series lengths of multiple spectrometer slit regions is less than or equal to the length of the spectrometer slit.

[0021] In the above technical solution, the reflective surface is set at 45° to the target light and the illumination light, respectively.

[0022] In the above technical solution, the spectrometer slit region below the transmission region is much larger than the spectrometer slit region below the reflection region.

[0023] In the above technical solution, the aperture-dimming flat prism includes: a transmission zone and reflection zones respectively disposed on both sides of the transmission zone.

[0024] A method for merging the visual field of a visual field merging device suitable for the above-mentioned spectrometer includes the following steps:

[0025] Step 1: The target light is incident on the transmission zone of the aperture-dimming flat prism; after transmission through the transmission zone, the target light enters the spectrometer slit region or the focal plane region of the area array camera below the transmission zone.

[0026] Step 2: The illumination light enters the reflection area of ​​the aperture-dimming flat prism and is directed towards the reflecting surface; after being reflected by the reflecting surface, the illumination light enters the spectrometer slit area or the focal plane area of ​​the area array camera below the reflection area.

[0027] Step 3: The target light and illumination light enter the spectrometer or the area array camera through the slit area of ​​the spectrometer or the focal plane area of ​​the area array camera below the transmission area and the reflection area, respectively.

[0028] Step 4: The target light and illumination light are combined and then enter the spectrometer or area array camera, which processes the incident light.

[0029] The present invention has the following beneficial effects:

[0030] The present invention relates to a field-of-view merging method and apparatus for spectrometers, which utilizes a field-of-view merging technique based on a split-aperture flat prism. This technique connects the target light and illumination light in series along the slit length of the spectrometer, enabling them to be merged and then imaged onto the same focal plane detector. At each integration time, the target light and illumination light are output onto the same frame image, thus achieving common optical path, common reference, and synchronous measurement of the target light and illumination light. Compared to the common-aperture beam combining of traditional common-field cubic prisms, the split-aperture flat prism achieves non-common-aperture field-of-view merging, making it particularly suitable for spectrometers such as spectrophotometers, fiber optic spectrometers, ground object spectrometers, and imaging spectrometers that require common optical path, common reference, and synchronous measurement of target light and illumination light.

[0031] The field-of-view merging device of the spectrometer of this invention has independent transmission and reflection zones. The transmission and reflection zones are bonded together by processes such as molecular bonding and UV photopolymerization. The reflective surfaces between the transmission and reflection zones achieve micrometer-level gap isolation. The transmission and reflection zones correspond to optical paths of different fields of view. After passing through the transmission and reflection zones, the target light and illumination light are connected in series without overlap along the length of the spectrometer slit with a micrometer-level gap, thereby achieving field-of-view merging. This invention utilizes a split-aperture flat prism with independent transmission and reflection zones to achieve non-co-aperture field-of-view merging, and is particularly suitable for spectrometers such as spectrophotometers, fiber optic spectrometers, ground object spectrometers, and imaging spectrometers that require a common optical path, common reference, and synchronous measurement of target light and illumination light. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a schematic diagram of a specific embodiment of the visual synchrotron device for the spectrometer of the present invention.

[0034] Figure 2 For application Figure 1 The flowchart shown is a view merging method of the view merging device of the spectrometer of the present invention.

[0035] Figure 3 for Figure 1 The diagram shows a focal plane of the spectrometer of the spectrometer of the present invention.

[0036] Figure 4 This is a three-dimensional structural schematic diagram of another specific embodiment of the visual juxtaposition device of the spectrometer of the present invention.

[0037] Figure 5 This is a schematic diagram of the structure of the spectrometer of the present invention, which is applicable to slit-type spectrometers for Earth remote sensing.

[0038] Figure 6 for Figure 5 The diagram shows a focal plane of the spectrometer of the spectrometer of the present invention.

[0039] Figure 7 This is a schematic diagram of another specific embodiment of the visual juxtaposition device for the spectrometer of the present invention.

[0040] Figure 8 This is a schematic diagram of another specific embodiment of the viewing device for the spectrometer of the present invention.

[0041] Figure 9 This is a schematic diagram of yet another specific embodiment of the viewing device for the spectrometer of the present invention.

[0042] The reference numerals in the figure are:

[0043] 100-diameter flat prism; 200-target beam;

[0044] 201-Front mirror group; 202-Transmission area; 203-Slit area of ​​the first spectrometer; 204-Focal area of ​​the first area array camera;

[0045] 300 - Illumination light; 301 - Energy harvesting and import device; 302 - Reflecting surface;

[0046] 303 - Second spectrometer slit region; 304 - Reflection region; 305 - Third spectrometer slit region;

[0047] 306 - Focal plane area of ​​the second array camera;

[0048] 601 - Dispersion region in the slit area of ​​the first spectrometer; 602 - Dispersion region in the slit area of ​​the second spectrometer. Detailed Implementation

[0049] The inventive concept of this invention is as follows:

[0050] The method for merging the visual field of the spectrometer of the present invention utilizes the series connection of the target light and the illumination light along the length of the spectrometer slit, thereby achieving the merging of the visual field of the target light and the illumination light into the same spectrometer, imaging them onto the same focal plane detector, and at each integration time, outputting the target light and the illumination light onto the same frame image, thereby achieving the common optical path, common reference, and synchronous measurement of the target light and the illumination light.

[0051] The spectral merging device of the present invention utilizes a split-aperture flat prism with independent transmission and reflection zones to achieve non-common aperture merging.

[0052] Specifically:

[0053] A split-aperture flat prism can be a single prism, in which case one of the transmission or reflection zones is the prism, and the other is the gap.

[0054] A split-aperture flat prism can also be composed of two or more prisms to form multiple transmission and reflection zones. Each transmission and reflection zone can be either a prism or a gap. The reflective surfaces between the various zones allow the target light or illumination light to be serially coupled without overlap along the length of the spectrometer slit after passing through the reflective surfaces. The individual lengths of the target light and illumination light, which are serially coupled without overlap along the spectrometer slit direction, can be arbitrary as needed. The total length after being serialized is less than or equal to the length of the spectrometer entrance slit, ensuring that all target light and illumination light are incident on the same spectrometer system and imaged onto the same spectrometer focal plane, thereby achieving common optical path, common reference, and synchronous measurement of the target light and illumination light.

[0055] In the field-of-view merging device of the spectrometer of the present invention, the focal plane of the spectrometer can be a single area array detector or multiple area array detectors; it can be a single linear array detector or multiple single linear array detectors, or a single or multiple multi-linear array detectors. The advantage of a single detector is that the electronic system is relatively simplified, and it can achieve precise synchronous acquisition of data from all fields of view. The disadvantage is that if the spectral radiance differences between multiple fields of view are large, a single detector can generally only be set with the same integration time and gain for all photosensitive areas in each exposure, which can lead to localized weak response or overexposure.

[0056] The present invention will now be described in detail with reference to the accompanying drawings.

[0057] Example 1

[0058] The viewing method and apparatus of the spectrometer in this embodiment are based on the aperture flat prism 100 and are applicable to slit-type spectrometers.

[0059] like Figure 1 As shown, the viewing merging device of the spectrometer of the present invention includes, in sequence, the following in the direction of the target light 200: a front mirror group 201, a transmission area 202 of a split-aperture flat prism 100, and a first spectrometer slit area 203; the viewing merging device of the present invention also includes, in sequence in the direction of the illumination light 300: an energy harvesting and importing device 301, a reflection area 304 of a split-aperture flat prism 100, and a second spectrometer slit area 303.

[0060] In the spectral merging device of the spectrometer of the present invention, the target light 200 and the illumination light 300 form a 90° angle; at one end where the reflection area 304 is connected to the transmission area 202, a reflective surface 302 is provided, which is set at a 45° angle to the target light 200 and the illumination light 300 respectively. After the illumination light 300 is reflected by the reflective surface 302, the optical path direction is rotated by 90° and the emission direction is parallel to the target light 200.

[0061] like Figure 1 As shown, in the spectral merging device of the spectrometer of the present invention, the aperture-dimming flat prism 100 is placed in front of the spectrometer slit. The target light 200 is focused by the front mirror group 201 and then enters the transmission area 202 of the aperture-dimming flat prism 100. After transmission, it enters the first spectrometer slit area 203. The illumination light 300 is introduced into the reflection area 304 of the aperture-dimming flat prism 100 by the energy harvesting and import device 301. After reflection by the reflection surface 302, it enters the second spectrometer slit area 303. The first spectrometer slit area 203 and the second spectrometer slit area 303 are connected in series along the length of the spectrometer slit, and the sum of their lengths should be less than or equal to the length of the spectrometer slit. This allows the target light 200 and the illumination light 300 to enter the same spectrometer after merging, thereby realizing the common optical path, common reference, and synchronous measurement of the target light and the illumination light.

[0062] Furthermore, the angle of the reflecting surface 302 of the split-aperture flat prism 100 within the prism is arbitrarily determined for ease of drawing and description, and can be set according to actual conditions during actual use. For example, Figure 1 The reflecting surface 302 of the aperture flat prism 100 shown is 45°. In actual use, it can be any angle to meet the optical-mechanical layout, which will not be elaborated here.

[0063] The following is combined Figure 2 Following the direction of data flow, the view merging method applicable to the view merging device of the spectrometer in this embodiment is described. In order to achieve synchronous measurement of the target light 200 and the illumination light 300, the target light 200 and the illumination light 300 need to enter the spectrometer slit simultaneously and be imaged on the same focal plane after being dispersed by the same spectrometer.

[0064] Step 1: The target light 200 enters the front lens group 201 and converges to form an image;

[0065] The target light 200, which is converged by the front mirror group 201, enters the transmission area 202 of the aperture flat prism 100.

[0066] After being transmitted through the transmission region 202, the target light 200 enters the slit region 203 of the first spectrometer;

[0067] Step 2: Illumination light 300 enters the energy harvesting and import device 301;

[0068] The energy harvesting and import device 301 imports the illumination light 300 into the reflection area 304 of the aperture flat prism 100 with a small field of view and directs it toward the reflection surface 302.

[0069] After being reflected by the reflective surface 302, the illumination light 300 enters the slit region 303 of the second spectrometer.

[0070] Step 3: The target light 200 and the illumination light 300 pass through the first spectrometer slit region 203 and the second spectrometer slit region 303, respectively, and enter the spectrometer through the spectrometer slit;

[0071] like Figure 1 As shown, with the line of intersection between the exit surface and the reflecting surface 302 of the split-aperture flat prism 100 as the dividing line, the left side is the target light 200 and the right side is the illumination light 300. The first spectrometer slit region 203 and the second spectrometer slit region 303 are connected in series in the length direction to achieve the merging of the target light and the illumination light in the slit length direction.

[0072] Step 4: The target light 200 and the illumination light 300 are visually merged and then enter the spectrometer optical system. The spectrometer system collimates, disperses, and images the incident light.

[0073] After the target light 200 is dispersed by the spectrometer, it is imaged in the first spectrometer slit dispersion region 601 on the focal plane of the spectrometer; after the illumination light 300 is dispersed by the spectrometer, it is imaged in the second spectrometer slit dispersion region 602 on the focal plane of the spectrometer. The image received by the spectrometer focal plane at this time is shown in [reference needed]. Figure 3 As shown. Thus, the target light 200 and the illumination light 300, after being visually merged through the split-aperture flat prism 100, are incident on the same spectrometer system and imaged on the same focal plane detector. At each integration time, the target light 200 and the illumination light 300 are output onto the same frame image.

[0074] Step 5: Data processing to obtain the transmittance / reflectance of the target in each band corresponding to the slit region 203 of the first spectrometer;

[0075] The above achieves the detection of target light and illumination light using a common optical path, a common reference, and synchronous measurement.

[0076] In data processing, taking the measurement of the target's reflectance spectrum as an example, the radiance L of each center wavelength of the target light 200 is... 反射 All correspond to the illumination light data E at the same moment. 入射 According to the reflectance calculation formula:

[0077] R(λ)=L 反射 (λ) / E 入射 (λ),

[0078] The spectral reflectance R of the target at that spatial location can then be obtained.

[0079] Example 2

[0080] The field-of-view merging device for the spectrometer in this embodiment is applicable to the field-of-view merging of area array cameras.

[0081] like Figure 4 As shown, the technical solution of this embodiment is basically the same as that of embodiment 1, with the following differences: the aperture flat prism 100 is placed in front of the focal plane of the area array camera, that is, the focal plane area 204 of the first area array camera and the focal plane area 306 of the second area array camera are the focal plane of the area array camera instead of the spectrometer slit; in addition, the front mirror group 201 and the energy harvesting and import device 301 are not set in this embodiment.

[0082] In this embodiment, the target light 200 and the illumination light 300 are combined into a field-scan camera. The field-scan camera processes the incident light to achieve non-co-aperture field-scanning.

[0083] Step 4: The target light 200 and the illumination light 300 are combined and incident on the area scan camera, which then images them.

[0084] The target light 200 is imaged onto the focal plane region 204 of the first area array camera; the illumination light 300 is imaged onto the focal plane region 306 of the second area array camera. Thus, the target light 200 and the illumination light 300, after being combined through the aperture-dimming prism 100, are incident on the area array camera and imaged onto the same focal plane detector. At each integration time, the target light 200 and the illumination light 300 are output onto the same frame image.

[0085] Step 5: Data processing to obtain the transmittance / reflectance of the target in each band corresponding to the focal plane area 204 of the first array camera.

[0086] In this embodiment, the size of the prism needs to be adjusted according to the actual optical path and image size, which will not be elaborated here.

[0087] Example 3

[0088] In the above embodiments, the position of the reflecting surface 302 of the aperture-plate prism 100 within the prism is arbitrarily determined for ease of drawing and description, and can be set according to actual conditions during actual use. For example, in a slit-type spectrometer for Earth remote sensing mounted on a UAV, the illumination light is the downward-facing light from the sun. In this case, there is no need to image the downward-facing light; only the amount of downward-facing radiation needs to be detected. The viewing angle of the spectrometer in this embodiment is as follows: Figure 5 As shown, the image received by the focal plane of the spectrometer at this time is as follows: Figure 6 As shown. In this embodiment 3, the slit region 203 of the first spectrometer is much larger than the slit region 303 of the second spectrometer.

[0089] In the above embodiments, the reflecting surface 302 of the aperture-dimming flat prism 100 is a bonding surface of two prisms. The advantages of this design are: on the one hand, it can effectively protect the reflecting surface 302 and prevent scratches and contamination; on the other hand, it can also make the outer envelope of the prism more regular and facilitate the structural installation; in addition, by bonding the prism into a flat structure, the processing technology of optical waveguides can be used to first complete the bonding of the two regional prisms, and then polish the incident and exit surfaces. The gap of the actual reflecting surface 302 can be controlled to the order of a few micrometers.

[0090] Example 4

[0091] Unlike the split-aperture flat prism 100, where the reflecting surface 302 is a joint surface of two prisms, the spectrometer in this embodiment uses only a portion of the split-aperture flat prism 100, omitting the split-aperture flat prism 100 in the reflecting area 304.

[0092] like Figure 7 As shown, the viewing merging device of the spectrometer of the present invention includes, in the direction of the target light 200, the following sequentially arranged: a transmission area 202 of a split-aperture flat prism 100 and a first spectrometer slit region 203; the viewing merging device of the present invention also includes, in the direction of the illumination light 300, the following sequentially arranged: a reflecting surface 302 disposed on the right side wall of the transmission area 202 at an angle of 45° to the target light 200 and the illumination light 300 respectively, and a second spectrometer slit region 303. The right side of the transmission area 202 of the split-aperture flat prism 100 is an empty gap. After being reflected by the reflecting surface 302, the illumination light 300 rotates 90° in its optical path direction, and its exit direction is parallel to the target light 200, pointing towards the second spectrometer slit region 303.

[0093] Example 5

[0094] Unlike the split-aperture flat prism 100, where the reflecting surface 302 is a joint surface of two prisms, the spectrometer in this embodiment uses only a portion of the split-aperture flat prism 100, omitting the split-aperture flat prism 100 in the transmission region 202.

[0095] like Figure 8 As shown, the viewing device of the spectrometer of the present invention includes, in sequence along the direction of the target light 200, a reflection area 304 of a split-aperture flat prism 100 and a second spectrometer slit area 303. A reflecting surface 302 is provided on the left side wall of the reflecting area 304 at a 45° angle to both the target light 200 and the illumination light 300. After being reflected by the reflecting surface 302, the illumination light 300 rotates 90° in its optical path direction, and its exit direction is parallel to the target light 200, heading towards the second spectrometer slit area 303.

[0096] The left side of the reflection area 304 of the aperture-type flat prism 100 is an empty gap. The target light 200 passes through this empty area and directly enters the slit area 203 of the first spectrometer.

[0097] The advantage of the two embodiments described above is that the number of prisms is reduced, resulting in lower costs. The disadvantage is that the sharp corners of the prisms will inevitably have chamfers or chipped edges, the gaps between different areas of the focal plane will become larger, and the detector target surface cannot be used to its maximum extent.

[0098] For clarity of description in the above embodiments, the light rays, slits, and images of the spectrometer focal plane in the two fields of view are intentionally separated by a distance. In actual use, the aperture-splitting flat prism 100 can use the processing technology of optical waveguides to first complete the bonding of the two prism regions, and then polish each incident and exit surfaces. The gap of the bonding surface of the actual reflecting surface can be controlled at the level of a few micrometers. Finally, the gap between the two regions of the focal plane image can be as small as the pixel level, and the detector target surface can be used to the maximum extent.

[0099] Example 6

[0100] The above embodiments are all examples of two optical paths, so the aperture-splitting flat prism 100 has only one reflecting surface. In actual use, two or even more reflecting and transmitting surfaces can be used to achieve the merging of two or more fields of view.

[0101] This embodiment is a split-aperture flat prism 100 made of three prisms, which can combine three fields of view by using two reflecting surfaces 302.

[0102] like Figure 9 As shown, the viewing device of the spectrometer of the present invention includes, in sequence, a transmission region 202 of a split-aperture flat prism 100 and a first spectrometer slit region 203 arranged in the direction of the target light 200; the target light 200 passes through the transmission region 202 and enters the first spectrometer slit region 203 after transmission.

[0103] The viewing merging device of the present invention further includes, in the direction of advancement of the illumination light 300, a reflection zone 304 disposed on the left side of the transmission zone 202, and a third spectrometer slit region 305 disposed below the reflection zone 304; the viewing merging device of the present invention also includes, in the direction of advancement of the illumination light 300, a reflection zone 304 disposed on the right side of the transmission zone 202, and a second spectrometer slit region 303 disposed below the reflection zone 304. A reflective surface 302 is provided on each side of the transmission zone 202, and is positioned at a 45° angle to both the target light 200 and the illumination light 300. The illumination light 300 entering from the left and right sides, after being reflected by a reflective surface 302, has its optical path direction rotated by 90°, and its exit direction is parallel to the target light 200, respectively striking the third spectrometer slit region 305 and the second spectrometer slit region 303.

[0104] The present invention relates to a field-of-view merging method and apparatus for spectrometers, which utilizes a field-of-view merging technique based on a split-aperture flat prism. This technique connects the target light and illumination light in series along the slit length of the spectrometer, enabling them to be merged and then imaged onto the same focal plane detector. At each integration time, the target light and illumination light are output onto the same frame image, thus achieving common optical path, common reference, and synchronous measurement of the target light and illumination light. Compared to the common-aperture beam combining of traditional common-field cubic prisms, the split-aperture flat prism achieves non-common-aperture field-of-view merging, making it particularly suitable for spectrometers such as spectrophotometers, fiber optic spectrometers, ground object spectrometers, and imaging spectrometers that require common optical path, common reference, and synchronous measurement of target light and illumination light.

[0105] The field-of-view merging device of the spectrometer of this invention has independent transmission and reflection zones. The transmission and reflection zones are bonded together by processes such as molecular bonding and UV photopolymerization. The reflective surfaces between the transmission and reflection zones achieve micrometer-level gap isolation. The transmission and reflection zones correspond to optical paths of different fields of view. After passing through the transmission and reflection zones, the target light and illumination light are connected in series without overlap along the length of the spectrometer slit with a micrometer-level gap, thereby achieving field-of-view merging. This invention utilizes a split-aperture flat prism with independent transmission and reflection zones to achieve non-co-aperture field-of-view merging, and is particularly suitable for spectrometers such as spectrophotometers, fiber optic spectrometers, ground object spectrometers, and imaging spectrometers that require a common optical path, common reference, and synchronous measurement of target light and illumination light.

[0106] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A visual synchrotron device for a spectrometer, characterized in that, include: Aperture-dimension flat prism (100); The aperture flat prism (100) includes at least one transmission area (202) and at least one reflection area (304) connected to each other; a reflective surface (302) is provided at the position where the reflective area (304) is connected to the transmission area (202); the reflective surface (302) is used to reflect the illumination light (300) so that it is emitted downward. Below each of the transmission regions (202) and each of the reflection regions (304) is provided a spectrometer slit region or a focal plane region of an area array camera; multiple spectrometer slit regions or focal plane regions of an area array camera are connected in series along the length of the aperture flat prism (100); The transmission zone (202) of the aperture flat prism (100) is used to allow the target light (200) to enter the spectrometer slit area or the focal plane area of ​​the area array camera below the transmission zone (202) after it is incident and transmitted. The reflective area (304) of the aperture flat prism (100) is used to allow illumination light (300) to be incident, and after being reflected by the reflective surface (302), it enters the spectrometer slit area or the focal plane area of ​​the area array camera below the reflective area (304).

2. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, At least one of the transmission regions (202) or at least one of the reflection regions (304) is a gap.

3. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, The spectrometer slit area is equipped with: One or more area array detectors, or One or more single-line array detectors, or Single or multiple multi-linear array detectors.

4. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, The sum of the series lengths of multiple spectrometer slit regions is less than or equal to the length of the spectrometer slit.

5. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, The reflective surface (302) is set at 45° to the target light (200) and the illumination light (300), respectively.

6. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, The spectrometer slit region below the transmission region (202) is much larger than the spectrometer slit region below the reflection region (304).

7. The visual synchrotron device for a spectrometer according to claim 1, characterized in that, The split-aperture flat prism (100) includes: a transmission zone (202) and reflection zones (304) respectively disposed on both sides of the transmission zone (202).

8. A method for merging the appearance of a spectrometer according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: The target light (200) is incident on the transmission area (202) of the aperture flat prism (100); after being transmitted through the transmission area (202), the target light (200) enters the spectrometer slit area or the focal plane area of ​​the area array camera below the transmission area (202). Step 2: The illumination light (300) enters the reflection area (304) of the aperture flat prism (100) and is directed toward the reflection surface (302); after being reflected by the reflection surface (302), the illumination light (300) enters the spectrometer slit area or the focal plane area of ​​the area array camera below the reflection area (304). Step 3: The target light (200) and the illumination light (300) enter the spectrometer or the area array camera through the slit area of ​​the spectrometer or the focal plane area of ​​the area array camera below the transmission area (202) and the reflection area (304), respectively. Step 4: The target light (200) and illumination light (300) are combined and then enter the spectrometer or area array camera, which processes the incident light.

Images