CT type spectrometer

Abstract

The present invention provides a CT-type spectrometer, comprising: a spectrometer housing for introducing reference light into the inside of the spectrometer; the light path assembly is arranged on the spectrograph shell and is used for guiding the reference light to the area array detector; the surface of the area array detector is divided into a reference light area and a signal light area, and the area array detector is used for synchronously receiving the reference light and the signal light emitted from the light path assembly; wherein after being adjusted by the light path assembly, the reference light enters the spectrograph through the hole and is incident to the reference light area, and the reference light and the signal light incident through the signal light path realize time and intensity synchronous detection on the area array detector. According to the embodiment, the same area array detector is used, the reference light and the signal light are collected on the same area array, and time and amplitude error steps among multiple detectors are greatly eliminated. Particularly, through the reconstruction of the spectrograph shell and the optimization of the light path, the complicated design of a time delayer is avoided, and a simple and low-cost synchronous triggering and noise reduction scheme is provided.

Description

Technical Field

[0001] The invention relates to the field of spectral technology, and in particular to a CT type spectrometer. Background Art

[0002] CT spectrometer, also known as Czerny-Turner structure spectrometer, is a common spectral measurement instrument. CT spectrometer is widely used in remote sensing imaging, spectroscopy technology, material science and other fields. With the development of technology, the requirements for the anti-interference ability of spectrometers in practical applications are constantly increasing. In order to improve the comprehensive anti-interference performance of CT spectrometers, a reference signal of synchronous excitation light is usually introduced into the optical signal in the experiment to remove noise of different frequencies. However, the existing technology faces the following problems when realizing the synchronization of the reference signal and the detection signal:

[0003] 1. The differences in response speed and optical path length of different detectors make time synchronization difficult;

[0004] 2. It is difficult to ensure the linear response of different detectors to the intensity of the same modulated light.

[0005] Existing photodetectors are usually equipped with synchronous trigger channels, but due to the circuit response time and optical path differences, it is difficult to achieve complete time synchronization between the reference signal and the detection signal. To solve this problem, it is necessary to use the same detector as the spectrometer to ensure consistent response rate, and to compensate for the optical path difference by adding a time delayer in the optical path. However, the difference in the detector's response to light of different intensities is still a key limiting factor. Existing technologies make it difficult to achieve time and intensity synchronization between the reference signal and the detection signal under simple and low-cost conditions. Therefore, a simple and efficient solution is urgently needed.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In view of the problems in the prior art, the object of the present invention is to provide a CT type spectrometer, which overcomes the difficulties of the prior art and can provide a simple, low-cost synchronization triggering and noise reduction solution.

[0008] The present disclosure provides a CT spectrometer, which includes:

[0009] The spectrometer housing is provided with a hole for introducing reference light into the spectrometer;

[0010] An optical path component installed in the spectrometer housing, used to guide the reference light to the area array detector;

[0011] The surface of the planar array detector is divided into a reference light area and a signal light area, and is used to synchronously receive the reference light and the signal light emitted from the optical path component;

[0012] Among them, after being adjusted by the optical path component, the reference light enters the interior of the spectrometer through the hole and is incident on the reference light area, and realizes time and intensity synchronization detection on the area array detector with the signal light incident through the signal optical path.

[0013] Optionally, the spectrometer housing includes a spectrometer top cover, the optical path component includes an optical fiber, the hole is arranged on the top cover, and the reference light is guided by the optical fiber and introduced into the interior of the spectrometer from the hole.

[0014] Optionally, the optical path component includes:

[0015] A collimating lens and at least two apertures disposed on the top cover, wherein the collimating lens is used to collimate the reference light, and the at least two apertures are used to reduce the diameter of the collimated light spot;

[0016] The focusing lens disposed under the top cover is used for focusing the reference light emitted from the two apertures onto the reference light area.

[0017] Optionally, the reference optical path comprises a first reflector group, and the first reflector group is arranged in the optical path between the at least two apertures and the focusing lens;

[0018] Wherein, the first reflector group includes a first reflector located on the top cover and a second reflector located under the top cover, and the reference light is incident on the focusing lens via the first reflector and the second reflector in sequence;

[0019] The second reflector and the focusing lens are mounted on an adjustable bracket, and the adjustable bracket is used to adjust the heights of the second reflector and the focusing lens.

[0020] Optionally, the adjustable bracket comprises:

[0021] An adjustment column, wherein the second reflector is mounted on the adjustment column via an adjustable mirror frame, and the adjustable mirror frame is configured to be slidably mounted along the adjustment column;

[0022] A guide rail adjustment frame is installed with the adjustable mirror frame, and the focusing lens is installed on the guide rail adjustment frame, which is configured to move back and forth along the guide rail to adjust the focus position of the reference light emitted by the focusing lens.

[0023] Optionally, the optical fiber is installed on an adjustable optical fiber rack, and the adjustable optical fiber rack is used to adjust the optical fiber to align with the center of the collimating lens through an adjusting knob.

[0024] Optionally, the CT spectrometer further comprises:

[0025] The sealing cover is installed on the top cover and is used to block external stray light.

[0026] Optionally, the CT spectrometer further comprises:

[0027] Sealing foam, arranged between the sealing cover and the top cover;

[0028] The rubber sealing ring is set at the optical fiber interface to prevent stray light from entering from the optical fiber entrance.

[0029] Optionally, the reference light region is arranged at an edge region of the area array detector, and the signal light region is other regions outside the edge region.

[0030] Optionally, it also includes:

[0031] Light source and beam splitter;

[0032] The beam splitter is used to split the incident light provided by the light source into the reference light and the signal light, and the reference light is introduced into the optical path component by the reference light.

[0033] The CT spectrometer proposed in the embodiment of the present disclosure has the following advantages:

[0034] This embodiment uses the same array detector and divides its surface into a reference light area and a signal light area, so that the reference light and the signal light are collected on the same array, which greatly eliminates the time and amplitude errors between multiple detectors and achieves nanosecond synchronization. In particular, this embodiment avoids the complex time delay device design and reduces the difficulty of implementation through the modification of the spectrometer housing and the optimization of the optical path, provides a simple and low-cost synchronization trigger and noise reduction solution, and broadens the application scenarios of CT spectrometers.

[0035] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0037] Figure 1 A top view of a CT spectrometer provided in an embodiment of the present disclosure;

[0038] Figure 2 A side cross-sectional view of a CT-type spectrometer provided in an embodiment of the present disclosure;

[0039] Figure 3A top view of a planar array detector in a CT spectrometer provided by an embodiment of the present disclosure is shown;

[0040] Figure 4 exhibit Figure 1 The optical path diagram of the CT spectrometer during operation is shown;

[0041] Figure 5 exhibit Figure 2 Schematic diagram of the assembly structure of the second reflector and the adjustable bracket;

[0042] Figure 6 A side cross-sectional view showing a CT-type spectrometer provided by an embodiment of the present disclosure with a sealing cover. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0044] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0045] like Figure 1 and Figure 2 As shown, the embodiment of the present disclosure provides a CT type spectrometer, which includes:

[0046] The spectrometer housing 1 is provided with a hole for introducing the reference light a into the spectrometer, wherein Figure 1 and Figure 2 The hole in is blocked and invisible, and the optical path of the reference light a can be referred to;

[0047] The optical path component 2 installed in the spectrometer housing 1 is used to guide the reference light a to the area array detector 3 (such as Figure 3 shown);

[0048] The surface of the area array detector 3 is divided into a reference light area A and a signal light area B, and is used to synchronously receive the reference light a and the signal light b emitted from the optical path component 2;

[0049] Among them, after being adjusted by the optical path component 2, the reference light a enters the spectrometer through the hole and is incident on the reference light area A, and realizes time and intensity synchronization detection on the area array detector 3 with the signal light b incident through the signal light path.

[0050] This embodiment uses the same array detector 3, and divides its surface into a reference light region A and a signal light region B, so that the reference light a and the signal light b are collected on the same array, which greatly eliminates the time and amplitude errors between multiple detectors and achieves nanosecond synchronization. In particular, this embodiment avoids the complex time delay device design and reduces the difficulty of implementation through the transformation of the spectrometer housing and the optimization of the optical path, provides a simple and low-cost synchronization trigger and noise reduction solution, and broadens the application scenarios of CT spectrometers.

[0051] Combination Figure 4 The excitation light emitted by the laser 100 is divided into the excitation light c and the reference light a by the beam splitter 101. The reference light a is introduced into the spectrometer 10 through the fiber coupler 102. The excitation light c excites the sample, and the sample generates the signal light b. The signal light b enters the spectrometer 10 through the original optical path of the spectrometer 10 and hits the same array detector 3 (such as Figure 3 shown).

[0052] Combination Figure 1 , Figure 2 and Figure 4 The spectrometer housing 1 includes a spectrometer top cover 11, and the optical path component 2 includes an optical fiber 21 ( Figure 2 and 4 The hole is set in the top cover 11, and the reference light a is guided by the optical fiber 21 from the hole into the interior of the spectrometer (such as Figure 2 Area s1 is shown).

[0053] In this embodiment, a hole is drilled on the top cover 11 of the spectrometer and combined with the optical fiber 21 to introduce the reference light a from the outside s2 into the inside of the spectrometer, thereby avoiding the external complex optical path design, simplifying the structure and reducing the cost.

[0054] In the embodiment of the present disclosure, the optical path component 2 includes:

[0055] A collimating lens 22 and at least two apertures 23 are arranged on the top cover 11, wherein the collimating lens 22 is used to collimate the reference light a, and the at least two apertures 23 are used to reduce the diameter of the collimated light spot;

[0056] The focusing lens 24 ( Figure 1 (not shown) for focusing the reference light emitted from the two apertures 23 onto the reference light region A (such as Figure 3 shown).

[0057] The collimating lens 22 is used to collimate the divergent light output by the optical fiber 21 to improve the light transmission efficiency.

[0058] The aperture 23 is used to control the size and shape of the reference light a. Specifically, by adjusting the size and shape of the aperture 23, the size and shape of the light beam passing through can be accurately controlled. For example, in this embodiment, the aperture 23 is used to reduce the spot diameter of the reference light a. The aperture 23 can also block unnecessary light and reduce the influence of stray light on the imaging quality.

[0059] The focusing lens 24 is used to focus the reference light a onto the area array detector 3 .

[0060] In this embodiment, by selecting the above-mentioned appropriate optical elements, the reference light a transmitted from the optical fiber 21 is introduced into the spectrometer 10. The selection of the optical element pair is not limited to this embodiment and can be selected according to needs.

[0061] In this embodiment, the optical path component 2 is arranged by means of the spectrometer top cover 11, and the top space of the spectrometer top cover 11 is reasonably utilized to achieve a reasonable layout, a simple structure and low cost.

[0062] In this embodiment, if Figure 1 and Figure 2 As shown, the optical fiber 21 is installed on an adjustable optical fiber rack 210 , and the adjustable optical fiber rack 210 is used to adjust the optical fiber 21 to align with the center of the collimating lens 22 through an adjusting knob 211 .

[0063] In this embodiment, the optical path component 2 includes a first reflector group 25 , and the first reflector group 25 is disposed on the optical path between the at least two apertures 23 and the focusing lens 24 .

[0064] The first reflector group 25 includes a first reflector 251 located on the top cover 11 and a second reflector 252 located under the top cover 11 . The reference light a is incident on the focusing lens 24 via the first reflector 251 and the second reflector 252 in sequence.

[0065] Combination Figure 2 and Figure 5 The second reflecting mirror 252 and the focusing lens 24 are installed on an adjustable bracket 4 , and the adjustable bracket 4 is used to adjust the height of the second reflecting mirror 252 and the focusing lens 24 .

[0066] By synchronously adjusting the height of the second reflector 252 and the focusing lens 24 using the adjustable bracket 4, the height of the reference light a beam emitted from the second reflector 252 and the focusing lens 24 can be adjusted, on the one hand to avoid the reference light a beam interfering with the optical path of the signal light b, and on the other hand to make it accurately fall into the reference light area A preset by the area array detector 3.

[0067] For example, Figure 2 and 5 As shown, the adjustable bracket 4 includes:

[0068] An adjusting column 41, wherein the second reflector 252 is mounted on the adjusting column 41 via an adjustable mirror frame 42, and the adjustable mirror frame 42 is configured to be slidably mounted along the adjusting column 41;

[0069] The guide rail adjustment frame 43 installed with the adjustable lens frame 42 , the focusing lens 24 installed on the guide rail adjustment frame 43 , is configured to move forward and backward along the guide rail 431 , so as to adjust the focus position of the reference light a emitted by the focusing lens 24 .

[0070] In this embodiment, the adjustable bracket 4 is provided with a knob 421. By loosening the knob 421, the adjustable mirror frame 42 can be operated to slide along the adjustment column 41 to achieve height adjustment. When the second reflector 252 reaches the target height, the knob 421 is tightened so that the knob 421 abuts against the adjustment column 41, and the adjustable mirror frame 42 is fixed on the adjustment column 41 to achieve retention.

[0071] The guide rail 431 of the guide rail adjustment frame 43 has a guide groove 43a, which cooperates with the two guide limit columns 254 on the side of the adjustable mirror frame 42 or the second reflector 252 to limit the position on the one hand and provide guiding cooperation on the other hand.

[0072] The extending direction of the guide rail 431 is parallel to the optical path of the reference light a. By moving the focusing lens 24 along the guide rail 431, the reference light a can be changed in the area array detector 3 (such as Figure 3 The reference light is positioned at a specific position on the surface of the array detector 3 to ensure that it falls into a preset area, such as a reference light area A at the edge of the array detector 3.

[0073] In this embodiment, if Figure 1 and Figure 2 As shown, the first reflector group 25 is used to adjust the direction of the reference light a so that it is accurately incident on the focusing lens 24 and finally incident on the area array detector 3 (such as Figure 3 As shown). Exemplarily, the first reflector group 25 further includes a third reflector 253, which is located on the top cover 11 and is disposed between the aperture 23 and the first reflector 251, and is used to reflect the light beam of the reference light a emitted by the aperture 23 by 90 degrees.

[0074] Therefore, the number and arrangement of the reflectors in the first reflector group are not limited by the present embodiment and can be selected according to the actual installation environment and optical path design, and are not limited here.

[0075] In the embodiments of the present disclosure, Figure 6 As shown, the CT spectrometer also includes:

[0076] The sealing cover 5 is installed on the top cover 11 to block external stray light.

[0077] Optionally, the CT spectrometer further comprises:

[0078] Sealing foam (not shown in the figure), arranged between the sealing cover 5 and the top cover 11;

[0079] A rubber sealing ring (not shown in the figure) is arranged at the optical fiber interface to prevent stray light from entering from the optical fiber entrance.

[0080] This prevents external light from penetrating through the holes, effectively blocks external stray light, prevents stray light interference, improves the signal-to-noise ratio, and ensures the stability of the optical path adjustment.

[0081] In this embodiment, if Figure 3 As shown, the reference light region A is set at the edge region of the area array detector 3, and the signal light region B is other regions outside the edge region.

[0082] In this embodiment, in order to distinguish the reference light and the signal light on the same area array detector 3 , the surface of the area array detector 3 is divided into two independent areas: a reference light area A and a signal light area B.

[0083] By setting the reference light area A at the edge area of ​​the area array detector 3, it can be separated from the signal light area to the maximum extent, avoiding spatial overlap or interference of the two optical signals on the detector. The edge area is located in the corner, as a clear independent area, it is convenient to collect the reference light separately by dividing the detector pixel columns, ensuring that the synchronization with the signal light in time and intensity is not disturbed.

[0084] In CT spectrometer, combined with Figure 2 As shown, the signal light b is usually incident on the detector array horizontally or at a specific angle through the original optical path (such as the incident slit, grating), forming a spectral distribution covering most of the detector surface. The signal light area occupies the main part of the detector to ensure spectral resolution and data integrity.

[0085] The reference light a is introduced through the hole in the top cover 11, and after being adjusted by the optical path component 2, it is incident on the area array detector 3. Since it is only used for synchronization calibration rather than spectral analysis, the required area is small. Focusing the reference light a to a corner (usually a small area at the edge of the detector) can avoid occupying the main collection area of ​​the signal light, while utilizing the edge of the detector that is not fully utilized by the signal light.

[0086] It is also noted that after the reference light a is adjusted by the collimating lens 22, the aperture 23 and the first reflector group 25, a small light spot C is formed by the focusing lens 24. The edge position facilitates the optical path component 2 to accurately guide the light spot to the edge of the detector at a certain angle.

[0087] In addition, if Figure 2 As shown, the reference light a is introduced from the top cover 11 and incident on the area array detector 3 at an inclined angle (as shown in FIG. Figure 3 As shown in Figure 2, the edge positions are natural target areas to avoid conflict with horizontally incident signal light (blue).

[0088] Therefore, the edge position is the area where the signal light is less involved in the area array detector 3 (especially in a CT spectrometer, the spectral data is concentrated in the center or main area). Placing the reference light a in the corner can avoid interfering with the collection of signal light and improve data quality.

[0089] The number of pixels in an array detector (such as CCD) is limited. The reference light area A is limited to the edge position (such as a few columns of pixels), which not only meets the synchronous detection requirements but also maximizes the utilization efficiency of the signal light area. The edge position is used as a fixed target area, which is convenient for experiments to be set by software or hardware (such as Figure 3 The column division shown in FIG. 4 is used to separate the reference light data, thereby simplifying subsequent signal processing.

[0090] Compared with the prior art where the reference light is usually collected by an independent detector or indirectly synchronized through external calibration, this embodiment uses a single array detector 3 for partitioned collection and selects the edge position as the reference light area A. This is an innovative and efficient design that avoids the complexity and cost of multiple detectors and achieves spatial independence and functional synchronization.

[0091] In addition, the edge position design fully utilizes the edge of the area array detector 3 to simplify the optical path adjustment and data processing, while the spatial separation enhances the noise reduction effect.

[0092] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A CT spectrometer, characterized in that: include: The spectrometer housing is provided with a hole for introducing reference light into the spectrometer; An optical path component installed in the spectrometer housing, used to guide the reference light to the area array detector; The surface of the planar array detector is divided into a reference light area and a signal light area, and is used to synchronously receive the reference light and the signal light emitted from the optical path component; Among them, after being adjusted by the optical path component, the reference light enters the interior of the spectrometer through the hole and is incident on the reference light area, and realizes time and intensity synchronization detection on the area array detector with the signal light incident through the signal optical path.

2. The CT spectrometer according to claim 1, characterized in that: The spectrometer housing includes a spectrometer top cover, the optical path component includes an optical fiber, the hole is arranged on the top cover, and the reference light is guided by the optical fiber and introduced into the interior of the spectrometer from the hole.

3. The CT spectrometer according to claim 2, characterized in that: The optical path component comprises: A collimating lens and at least two apertures disposed on the top cover, wherein the collimating lens is used to collimate the reference light, and the at least two apertures are used to reduce the diameter of the collimated light spot; The focusing lens disposed under the top cover is used for focusing the reference light emitted from the two apertures onto the reference light area.

4. The CT spectrometer according to claim 3, characterized in that: The optical path assembly comprises a first reflector group, and the first reflector group is arranged in the optical path between the at least two apertures and the focusing lens; Wherein, the first reflector group includes a first reflector located on the top cover and a second reflector located under the top cover, and the reference light is incident on the focusing lens via the first reflector and the second reflector in sequence; The second reflector and the focusing lens are mounted on an adjustable bracket, and the adjustable bracket is used to adjust the heights of the second reflector and the focusing lens.

5. The CT spectrometer according to claim 4, characterized in that: The adjustable bracket comprises: An adjustment column, wherein the second reflector is mounted on the adjustment column via an adjustable mirror frame, and the adjustable mirror frame is configured to be slidably mounted along the adjustment column; A guide rail adjustment frame is installed with the adjustable mirror frame, and the focusing lens is installed on the guide rail adjustment frame, which is configured to move back and forth along the guide rail to adjust the focus position of the reference light emitted by the focusing lens.

6. The CT spectrometer according to claim 3, characterized in that: The optical fiber is installed on an adjustable optical fiber rack, and the adjustable optical fiber rack is used to adjust the optical fiber to align with the center of the collimating lens through an adjusting knob.

7. The CT spectrometer according to claim 2, characterized in that: The CT type spectrometer also includes: The sealing cover is installed on the top cover and is used to block external stray light.

8. The CT spectrometer according to claim 7, characterized in that: The CT spectrometer also includes: Sealing foam, arranged between the sealing cover and the top cover; The rubber sealing ring is set at the optical fiber interface to prevent stray light from entering from the optical fiber entrance.

9. The CT spectrometer according to claim 1, characterized in that: The reference light region is arranged at an edge region of the area array detector, and the signal light region is other regions outside the edge region.

10. The CT spectrometer according to claim 1, characterized in that: Also includes: Light source and beam splitter; The beam splitter is used to split the incident light provided by the light source into the reference light and the signal light, and the reference light is introduced into the optical path component by the reference light.

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