Optical fiber spectrometer and in-situ water measuring instrument thereof

Abstract

The application discloses a kind of optical fiber spectrometer and its in-situ water measuring instrument, belong to optical analysis instrument technical field, solve the existing CT light path and M light path The optical fiber spectrometer due to limited geometric size, lead to the problem that it cannot be used in use scene.A kind of optical fiber spectrometer includes shell and the slit component, collimating mirror, grating module, focusing mirror module, mirror module and linear array photoelectric detector module being set in shell, slit component, collimating mirror, grating module, focusing mirror module, mirror module and linear array photoelectric detector module are in shell;When using, incident light passes through slit component, collimating mirror, grating module, focusing mirror module, mirror module and linear array photoelectric detector module form spectral detection light path.The optical fiber spectrometer of the application not only makes the angle of mirror module can be adjusted and reduces the plane layout of light path, so that the appearance of optical fiber spectrometer is slender and can be used in the use scene of limited geometric size.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical analysis instruments, and particularly relates to a fiber-optic spectrometer and an in-situ water measuring instrument thereof. BACKGROUND

[0002] The conventional fiber-optic spectrometer optical system structure on the market currently comprises a slit module, a collimating mirror, a grating, a focusing mirror and a CCD photoelectric detector; the light path of the conventional fiber-optic spectrometer is of a Czerny-Turner (CT) structure, and the optical components are arranged on the same plane. Although people can make a conventional small CT light path fiber-optic spectrometer by using small-sized optical components, the compression of the geometric size on the plane is greatly limited, so it is difficult to make the shape of the fiber-optic spectrometer slender. Therefore, for some application scenarios requiring small-sized and slender fiber-optic spectrometers, such as in-situ water measurement applications, the whole sealed cylindrical probe is immersed in water, so there is a need to use a slender fiber-optic spectrometer, and the conventional CT light path spectrometer is difficult to meet the actual needs. Similarly, the conventional M light path fiber-optic spectrometer also has the same shortcomings because the optical components are arranged on the same plane.

[0003] Therefore, it is necessary to develop a small-sized and slender fiber-optic spectrometer for different scenarios and in-situ water quality measurement. SUMMARY

[0004] The present application aims to provide a fiber-optic spectrometer and an in-situ water measuring instrument thereof, which solves the problem that the plane layout of the light path of the conventional CT light path and M light path fiber-optic spectrometers is large, the optical components are arranged on the same plane, and the application of small-sized and slender fiber-optic spectrometers cannot be met.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows: a fiber-optic spectrometer, comprising a shell and a slit assembly, a collimating mirror, a grating module, a focusing mirror module, a mirror module and a linear array photoelectric detector module arranged in the shell; the slit assembly, the collimating mirror, the grating module, the focusing mirror module, the mirror module and the linear array photoelectric detector module are arranged on the inner wall of the shell; when in use, the incident light passes through the slit assembly, the collimating mirror, the grating module, the focusing mirror module, the mirror module and the linear array photoelectric detector module to form a spectral detection light path.

[0006] In some embodiments, the slit assembly, the grating module, the focusing lens module, the linear array photodetector module, the collimating lens, and the reflecting mirror module are sequentially disposed on the inner periphery of the housing; in use, the incident light passes sequentially through the slit assembly, the collimating lens, the grating module, the focusing lens module, the reflecting mirror module, and the linear array photodetector module to form a CT-type optical path.

[0007] In some embodiments, two mirror modules are provided. The slit assembly, the collimating lens, the focusing lens module, the linear array photodetector module, one of the mirror modules, the grating module, and the other mirror module are sequentially disposed on the inner periphery of the housing. In use, the incident light passes sequentially through the slit assembly, the other mirror module, the collimating lens, the grating module, the focusing lens module, one of the mirror modules, and the linear array photodetector module to form an M-shaped optical path.

[0008] In some embodiments, the slit assembly includes an optical fiber coupling connector and a slit, the optical fiber coupling connector being used to secure an optical fiber or a coupling lens.

[0009] In some embodiments, the grating module includes a grating bracket and a grating disposed on the grating bracket. The grating bracket is disposed on the housing. The grating bracket includes a base, a support, and a rotating shaft. The support and the grating are disposed on the base, and the grating is in close contact with the support. The rotating shaft is disposed at the lower end of the base and is connected to the housing.

[0010] In some embodiments, the upper end of the bracket is provided with an adjustment notch, and the base is provided with a positioning block near the grating; the upper end of the bracket is also provided with fixing holes on both sides of the adjustment notch.

[0011] In some embodiments, the reflector module includes a reflector bracket and a reflector disposed on the reflector bracket, the reflector bracket being disposed on the housing.

[0012] In some embodiments, the reflector bracket includes a bracket body, a limiting block, and a rotating shaft. The limiting block is fixedly disposed on one side of the bracket body, and the rotating shaft is located on the side of the bracket body near the limiting block and connected to the bracket body. The rotating shaft is disposed on the housing.

[0013] In some embodiments, the upper edge of the support body is provided with a first limiting plate and a second limiting plate for limiting the position of the reflector, and the reflector is disposed in the space formed by the first limiting plate and the second limiting plate.

[0014] Another technical solution of the present application is implemented as follows: comprising an in-situ water measurement probe shell, the optical fiber spectrometer, the xenon lamp, the control circuit, the transmitting end sealing window, the receiving end sealing window, and the in-situ water measurement probe gap, the optical fiber spectrometer, the xenon lamp, and the control circuit are sealed in the in-situ water measurement probe shell, the transmitting end sealing window is used for sealing the through hole of the in-situ water measurement probe shell on the side of the xenon lamp; the receiving end sealing window is used for sealing the through hole of the in-situ water measurement probe shell on the side of the optical fiber spectrometer; the transmitting end sealing window and the receiving end sealing window form the in-situ water measurement probe gap, and the optical fiber spectrometer, the xenon lamp, the transmitting end sealing window and the receiving end sealing window are located on the same optical axis to pass light.

[0015] Compared with the prior art, the optical fiber spectrometer of the present application is different from the prior art in that the optical components are not located on the same plane, and the angle-adjustable mirror module is added in the present application, which greatly reduces the planar layout of the optical path, so that the optical fiber spectrometer has an elongated shape and can be used in limited geometric size scenes. Therefore, the optical fiber spectrometer of the present application is applied to an immersion in-situ water measurement instrument, and is used for water quality measurement in different scenes, such as measurement of surface water, underground water and offshore seawater, to realize online water quality detection without secondary pollution. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a CT optical path optical fiber spectrometer schematic diagram in embodiment 1 of the present application;

[0017] Figure 2 It is a M optical path optical fiber spectrometer schematic diagram in embodiment 2 of the present application;

[0018] Figure 3 It is a grating module structure schematic diagram in the embodiment of the present application;

[0019] Figure 4 It is a mirror module structure schematic diagram in the embodiment of the present application;

[0020] Figure 5 It is another structure schematic diagram of the mirror module in the embodiment of the present application;

[0021] Figure 6 It is a structure schematic diagram of the linear array photoelectric detector module in the embodiment of the present application;

[0022] Figure 7 It is a structure schematic diagram of the in-situ water measurement instrument in embodiment 3 of the present application;

[0023] Figure 8 It is a spectrum diagram of the in-situ measurement instrument in embodiment 3 of the present application.

[0024] In the figure, 1. Slit assembly, 2. Collimating lens, 3. Grating module, 31. Grating bracket, 311. Base, 312. Bracket, 3121. Adjustment notch, 3122. Fixing hole, 32. Grating, 4. Focusing lens module, 5. Reflector module, 51. Reflector bracket, 511. Bracket body, 5111. First limiting plate, 5112. Second limiting plate, 512. Limiting block, 52. Reflector, 6. Linear array photodetector module, 61. Photosensitive surface of linear array photodetector. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] In the description of this invention, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this invention. They do not imply that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this invention. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1

[0028] An optical fiber spectrometer is provided in Embodiment 1 of the present invention, such as... Figure 1 As shown, the device includes a housing and a slit assembly 1, a collimating lens 2, a grating module 3, a focusing lens module 4, a reflecting mirror module 5, and a linear array photodetector module 6 disposed within the housing. The slit assembly 1, the grating module 3, the focusing lens module 4, the linear array photodetector module 6, the collimating lens 2, and the reflecting mirror module 5 are sequentially arranged on the inner periphery of the housing. In use, the incident light passes sequentially through the slit assembly 1, the collimating lens 2, the grating module 3, the focusing lens module 4, the reflecting mirror module 5, and the linear array photodetector module 6 to form a CT-type optical path.

[0029] After the above scheme, the optical fiber spectrometer of the present application is different from the prior art in that the optical components are not located on the same plane, and the positions of the internal optical components are adjusted as needed, so that the volume of the optical fiber spectrometer is reduced and becomes elongated. The optical fiber spectrometer of the present application can be applied to an immersion in-situ water measuring instrument for water quality measurement in different scenes, such as measurement of surface water, underground water and offshore seawater, to realize online water quality detection without secondary pollution.

[0030] In the specific implementation process of the embodiment, the slit assembly 1 includes a fiber coupling joint and a slit, and the fiber coupling joint is used to fix the optical fiber or the coupling lens.

[0031] More specifically, the slit assembly 1 is composed of a fiber coupling joint and a slit, and the fiber coupling joint is used to fix the optical fiber or the coupling lens, and the measured light is guided into the slit assembly 1 by the optical fiber or the coupling lens. The measured light forms a thin linear light after passing through the slit and is emitted to the collimating mirror 2; after collimation by the collimating mirror 2, it is emitted to the grating module 3, and after diffraction and light splitting by the grating module 3, it forms spatially continuous monochromatic light and is emitted to the focusing mirror module 4; after focusing by the focusing mirror module 4, it is emitted to the reflecting mirror module 5; after reflection by the reflecting mirror module 5 at a certain angle, such as 45 degrees, it is emitted to the linear array photoelectric detector 6 and is focused on the linear array photoelectric detector 6 to form linear continuous monochromatic light, and after photoelectric conversion by the linear array photoelectric detector 6, the measured spectrum is output in the form of an electrical signal.

[0032] In the specific implementation process of the embodiment, as shown in Figure 3 The grating module 3 includes a grating support 31 and a grating 32 arranged on the grating support 31, the grating support 31 is arranged on the housing, the grating support 31 includes a base 311, a support 312 and a rotating shaft, the support 312 and the grating 32 are arranged on the base 311, and the grating 32 is tightly attached to the support 312, the rotating shaft is arranged at the lower end of the base 311, and the rotating shaft is connected with the housing.

[0033] In the specific implementation process of the embodiment, as shown in Figure 3 The upper end of the support 312 is provided with an adjusting gap 3121, and the base 311 is provided with a positioning block 3111 near the position of the grating 32; the upper end of the support 312 is also provided with a fixing hole 3122 on both sides of the adjusting gap 3121.

[0034] More specifically, the grating 32 is fixed on the grating support 31 through the positioning block 3111, the grating support 31 is rotated by adjusting the gap 3121 using a tool, the rotation of the grating support 31 is realized through the rotating shaft, the rotating shaft is placed into the hole of the CT light path folded fiber spectrometer in a tight fit manner, and the rotation of the grating support 31 is used to adjust the position of the spectral light on the X-axis direction (i.e. the direction in which the pixels of the linear array photoelectric detector 6 are arranged in sequence) of the linear array photoelectric detector 6; after the adjustment of the grating support 31 is completed, the grating support 31 is fixed on the CT light path folded fiber spectrometer through the screws used in the fixed holes 3122 on both sides of the adjustment gap 3121, and the embodiment is not limited to screws, bolts or pins, and other matching manners can also be used for fixing.

[0035] In the specific implementation process of the embodiment, as shown in Figure 4 and Figure 5 , the mirror module 5 includes a mirror support 51 and a mirror 52 arranged on the mirror support 51, and the mirror support 51 is arranged on the shell.

[0036] In the specific implementation process of the embodiment, as shown in Figure 4 and Figure 5 , the mirror support 51 includes a support body 511, a limiting block 512 and a rotating shaft, the limiting block 512 is fixed on one side of the support body 511, the rotating shaft is located on the side of the support body 511 close to the limiting block 512 and is connected with the support body 511, and the rotating shaft is arranged on the shell.

[0037] In the specific implementation process of the embodiment, as shown in Figure 4 and Figure 5 , the upper edge of the support body 511 is extended and provided with a first limiting plate 5111 and a second limiting plate 5112 for limiting the mirror 52, and the mirror 52 is arranged in the space composed of the first limiting plate 5111 and the second limiting plate 5112.

[0038] More specifically, the mirror 52 is fixed on the reflecting support 51, the mirror 52 is arranged in the space composed of the first limiting plate 5111 and the second limiting plate 5112, and the first limiting plate 5111 and the second limiting plate 5112 realize the limiting in two directions on the same plane. The rotation of the reflecting support 51 is realized by adjusting the limiting block 512, and is used to adjust the position of the spectral light on the Y-axis direction (i.e. the direction perpendicular to the direction in which the pixels of the linear array photoelectric detector 6 are arranged in sequence) of the linear array photoelectric detector 6.

[0039] Further, as shown in Figure 4As shown in the figure, the limiting block 512 and the bracket body 511 are L-shaped, and a through hole and a screw hole are arranged in sequence on the limiting block 512. The limiting block 512 is connected with the shell through two connecting members, which are screws or other components for fastening or clamping. The connecting members are placed in the through hole, and the connecting members are tightened to cooperate with the screw holes on the shell to provide fastening force. In addition, the connecting members are placed in the screw holes, and the connecting members are tightened to contact the shell to provide clamping force. The rotation of the mirror bracket 51 is realized by adjusting the tightness of the two connecting members, and the mirror bracket 51 rotates around the rotation shaft, which is tightly fitted into the hole on the CT optical fiber spectrometer.

[0040] Further, as shown in the figure, Figure 5 The limiting block 512 and the bracket body 511 are T-shaped, and two through holes are symmetrically arranged on the limiting block 512. The limiting block 512 is connected with the shell through two connecting members, which are screws or other components for fastening. The two connecting members are placed in the through hole, and the two connecting members are alternately tightened to cooperate with the screw holes on the shell. The rotation of the mirror bracket 51 is realized by adjusting the tightness of the two connecting members, and the mirror bracket 51 rotates around the rotation shaft, which is tightly fitted into the hole on the CT optical fiber spectrometer.

[0041] In the specific implementation process of the embodiment, as shown in the figure, Figure 6 The linear array photoelectric detector module 6 is provided with a linear array photoelectric detector photosurface 61.

[0042] More specifically, the linear array photoelectric detector module 6 is provided with a linear array photoelectric detector photosurface 61, and the linear array photoelectric detector photosurface 61 has a horizontal direction X-axis and a vertical direction Y-axis. The linear array photoelectric detector module 6 can be a CCD, CMOS or APD array device. The linear array photoelectric detector photosurface 61 can be composed of pixels of different sizes, such as 256, 512, 1024 and 2048 pixels. The focused measured light is imaged on the linear array photoelectric detector photosurface 61, perpendicular to the vertical direction Y-axis of the linear array photoelectric detector photosurface 61, and forms a linear continuous distribution of monochromatic light along the horizontal direction X-axis of the linear array photoelectric detector photosurface 61. After photoelectric conversion by the linear array photoelectric detector module 6, the measured spectrum can be output in the form of electrical signal, that is, the distribution of light intensity with the distribution of pixels of the linear array photoelectric detector photosurface 61. If a standard lamp is used to calibrate the wavelength of the fiber spectrometer of the present application, the spectrum can also be expressed as the distribution of light intensity with wavelength.

[0043] The workflow provided by the embodiment 1 of the present application is as follows: the measured light forms a slender linear light after passing through the slit and is emitted to the collimating mirror 2; the light is emitted to the grating module 3 after collimation by the collimating mirror 2, forms spatially continuous distribution monochromatic light after diffraction by the grating module 3, and is emitted to the focusing mirror module 4; the position of the spectral light in the X-axis direction of the linear array photoelectric detector 6 is adjusted by adjusting the aperture 3121 to adjust the rotation of the grating support 31; the light is emitted to the reflecting mirror module 5 after focusing by the focusing mirror module 4; the rotation of the reflecting support 51 is realized by adjusting the limiting block 512, for adjusting the position of the spectral light in the Y-axis direction of the linear array photoelectric detector 6; the light is reflected by the reflecting mirror module 5 at a certain angle, such as 45 degrees, and is emitted to the linear array photoelectric detector 6 and focused on the linear array photoelectric detector 6 to form linear continuous distribution monochromatic light, the formed light path is a CT type light path, and the measured spectrum is output in the form of an electrical signal after photoelectric conversion by the linear array photoelectric detector 6.

[0044] Embodiment 2

[0045] The optical fiber spectrometer provided by the embodiment 2 is shown in Figure 2 The reflecting mirror module 5 is provided with two, the slit assembly 1, the collimating mirror 2, the focusing mirror module 4, the linear array photoelectric detector module 6, one of the reflecting mirror modules 5, the grating module 3 and the other reflecting mirror module 5 are sequentially arranged in the inner wall of the shell, and the incident light sequentially passes through the slit assembly 1, the other reflecting mirror module 5, the collimating mirror 2, the grating module 3, the focusing mirror module 4, one of the reflecting mirror modules 5 and the linear array photoelectric detector module 6 to form an M type light path.

[0046] The difference between the embodiment 2 and the embodiment 1 is that the embodiment 2 has two reflecting mirror modules 5, the measured light is introduced into the slit assembly 1 by an optical fiber or a coupling lens, the measured light forms a slender linear light after passing through the slit and is emitted to a 45-degree reflecting mirror module 5, the light is emitted to the collimating mirror 2 at a 45-degree angle after reflection by the 45-degree reflecting mirror module 5, the light is emitted to the grating module 3 after collimation by the collimating mirror 2, forms spatially continuous distribution monochromatic light after diffraction by the grating module 3, and is emitted to the focusing mirror module 4; the light is emitted to the other reflecting mirror module 5 after focusing by the focusing mirror module 4; the light is reflected by the other reflecting mirror module 5 at a certain angle, such as 45 degrees, and is emitted to the linear array photoelectric detector 6, and is focused on the linear array photoelectric detector 6 to form linear continuous distribution monochromatic light, and the measured spectrum can be output in the form of an electrical signal after photoelectric conversion by the linear array photoelectric detector 6.

[0047] The workflow provided by the embodiment 2 of the present application is as follows: the measured light forms a slender linear light after passing through the slit and is shot to the 45-degree mirror module 5, is reflected by the 45-degree mirror module 5 and is shot to the collimating mirror 2 at a 45-degree angle, is collimated by the collimating mirror 2 and is shot to the grating module 3, forms spatially continuous monochromatic light after diffracting by the grating module 3, and is shot to the focusing mirror module 4; the rotation of the grating support 31 is adjusted by adjusting the aperture 3121 to adjust the position of the spectral light on the X-axis direction of the linear array photoelectric detector 6; the spectral light is shot to the other mirror module 5 after focusing by the focusing mirror module 4; the rotation of the reflecting support 51 is realized by adjusting the limiting block 512 to adjust the position of the spectral light on the Y-axis direction of the linear array photoelectric detector 6; the spectral light is shot to the linear array photoelectric detector 6 and is focused on the linear array photoelectric detector 6 to form linearly continuous monochromatic light after being reflected by the other mirror module 5 at a certain angle, such as 45 degrees; and the light path formed is an M-shaped light path, and the measured spectrum is output in the form of an electrical signal after photoelectric conversion by the linear array photoelectric detector 6.

[0048] Embodiment 3

[0049] The embodiment 3 of the present application provides an in-situ water measuring instrument, as shown in the figure, Figure 7 , Figure 7 In the figure, a is an in-situ water measuring probe shell, b is the optical fiber spectrometer in the embodiments 1 and 2, c is a xenon lamp, d is a control circuit, e is a receiving end sealing window, f is a transmitting end sealing window, and g is an in-situ water measuring probe gap. The in-situ water measuring instrument comprises the in-situ water measuring probe shell a, the optical fiber spectrometer b in the embodiments 1 and 2, the xenon lamp c, the control circuit d, the receiving end sealing window e, the transmitting end sealing window f, and the in-situ water measuring probe gap g. The optical fiber spectrometer b, the xenon lamp c, and the control circuit d are sealed in the in-situ water measuring probe shell a. The transmitting end sealing window f is used to seal the through hole of the in-situ water measuring probe shell a on the side of the xenon lamp c. The receiving end sealing window e is used to seal the through hole of the in-situ water measuring probe shell a on the side of the optical fiber spectrometer b. The transmitting end sealing window f and the receiving end sealing window e form the in-situ water measuring probe gap g. The optical fiber spectrometer b, the xenon lamp c, the transmitting end sealing window f, and the receiving end sealing window e are located on the same optical axis to make the light pass through.

[0050] More specifically, the optical fiber spectrometer b, the xenon lamp c and the control circuit d are fixed in the in-situ water measurement probe housing a; the emission end sealing window f is used to seal the through hole of the in-situ water measurement probe housing a on the side of the xenon lamp c and ensure the passage of the measurement light; the receiving end sealing window e is used to seal the through hole of the in-situ water measurement probe housing a on the side of the optical fiber spectrometer b of the embodiments 1 and 2 of the present application and ensure the passage of the measurement light; the in-situ water measurement probe gap g is formed between the emission end sealing window f and the receiving end sealing window e, so as to ensure that the measured water is immersed in the measurement light path. The wide-spectrum measurement light including ultraviolet light, visible light and near-infrared light emitted by the xenon lamp c passes through the emission end sealing window f, enters the water in the in-situ water measurement probe gap g, and the measurement light absorbed by the water enters the optical fiber spectrometer b of the embodiments 1 and 2 of the present application through the receiving end sealing window e. The absorption spectrum of the water is measured by the optical fiber spectrometer b, and the composition and concentration of the measured water can be calculated by comparing with the pre-stored reference spectrum.

[0051] The M light path optical fiber spectrometer in the embodiment 2 is used to measure the spectrum of the xenon lamp in the embodiment 3, and the spectrum from 200 nm to 820 nm is as shown in the following figure: Figure 8 As shown in the figure, the spectrum covers the spectrum related to the in-situ water measurement, including 220 nm and 275 nm for measuring total nitrogen, 600 nm for measuring chemical oxygen demand COD, 660 nm for measuring ammonia nitrogen and 700 nm for measuring total phosphorus, etc.

[0052] The working process provided by the embodiment 3 of the present application is as follows: the wide-spectrum measurement light including ultraviolet light, visible light and near-infrared light emitted by the xenon lamp c passes through the emission end sealing window f, enters the water in the in-situ water measurement probe gap g, and the measurement light absorbed by the water enters the optical fiber spectrometer b of the embodiments 1 and 2 of the present application through the receiving end sealing window e. The absorption spectrum of the water is measured by the optical fiber spectrometer b, and the composition and concentration of the measured water can be calculated by comparing with the pre-stored reference spectrum, so as to realize the online water quality detection without secondary pollution.

[0053] In summary, the optical fiber spectrometer of the present application is different from the prior art in that the optical elements are not located in the same plane. The addition of the mirror module in the present application not only adjusts the angle of the focused spectral light beam but also shortens the optical path. The position of the internal optical elements can be adjusted according to the needs, so that the optical fiber spectrometer is small in size. The optical fiber spectrometer of the present application is applied to the in-situ water measurement instrument and is used for water quality measurement in different scenes, such as measurement of surface water, underground water and offshore seawater, so as to realize the online water quality detection without secondary pollution.

[0054] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed by the present application, which can be easily thought by those skilled in the art, should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fiber optic spectrometer, characterized in that, The device includes a housing and a slit assembly (1), a collimating lens (2), a grating module (3), a focusing lens module (4), a reflecting mirror module (5), and a linear photodetector module (6) disposed within the housing. The slit assembly (1), the collimating lens (2), the grating module (3), the focusing lens module (4), the reflecting mirror module (5), and the linear photodetector module (6) are located on the inner periphery of the housing. In use, incident light passes sequentially through the slit assembly (1), the collimating lens (2), the grating module (3), the focusing lens module (4), the reflecting mirror module (5), and the linear photodetector module (6) to form a spectral detection optical path. The optical components are not located on the same plane, and the angle-adjustable mirror module makes the fiber optic spectrometer have a slender shape, which can be used in geometrically limited application scenarios. The grating module (3) includes a grating bracket (31) and a grating (32) disposed on the grating bracket (31). The grating bracket (31) is disposed on the housing. The grating bracket (31) includes a base (311), a bracket (312), and a rotating shaft. The bracket (312) and the grating (32) are disposed on the base (311), and the grating (32) is in close contact with the bracket (312). The rotating shaft is disposed at the lower end of the base (311). The shaft is connected to the housing; the upper end of the bracket (312) is provided with an adjustment notch (3121), and the base (311) is provided with a positioning block (3111) near the grating (32); the upper end of the bracket (312) is also provided with fixing holes (3122) on both sides of the adjustment notch (3121); the grating bracket (31) is rotated by adjusting the adjustment notch (3121) to adjust the position of the spectral light in the X-axis direction of the linear array photodetector module (6); The reflector module (5) includes a reflector bracket (51) and a reflector (52) disposed on the reflector bracket (51). The reflector bracket (51) is disposed on the housing. The reflector bracket (51) includes a bracket body (511), a limiting block (512) and a rotating shaft. The limiting block (512) is fixedly disposed on one side of the bracket body (511). The rotating shaft is located on the side of the bracket body (511) close to the limiting block (512) and connected to the bracket body (511). The rotating shaft is disposed on the housing. The rotation of the reflector bracket (51) is achieved by adjusting the limiting block (512), which is used to adjust the position of the spectral light in the Y-axis direction of the linear array photodetector module (6).

2. The fiber optic spectrometer according to claim 1, characterized in that, The slit assembly (1), the grating module (3), the focusing lens module (4), the linear array photodetector module (6), the collimating lens (2), and the reflecting mirror module (5) are sequentially disposed on the inner periphery of the housing; in use, the incident light passes sequentially through the slit assembly (1), the collimating lens (2), the grating module (3), the focusing lens module (4), the reflecting mirror module (5), and the linear array photodetector module (6) to form a CT-type optical path.

3. The fiber optic spectrometer according to claim 1, characterized in that, The reflector module (5) is configured as two. The slit assembly (1), the collimating mirror (2), the focusing mirror module (4), the linear array photodetector module (6), one of the reflector modules (5), the grating module (3) and the other reflector module (5) are sequentially arranged on the inner periphery of the housing. In use, the incident light passes through the slit assembly (1), the other reflector module (5), the collimating mirror (2), the grating module (3), the focusing mirror module (4), one of the reflector modules (5) and the linear array photodetector module (6) in sequence to form an M-shaped optical path.

4. The fiber optic spectrometer according to any one of claims 1-3, characterized in that, The slit assembly (1) includes an optical fiber coupling connector and a slit, wherein the optical fiber coupling connector is used to fix an optical fiber or a coupling lens.

5. The fiber optic spectrometer according to claim 1, characterized in that, The upper edge of the bracket body (511) is provided with a first limiting plate (5111) and a second limiting plate (5112) for limiting the position of the reflector (52), and the reflector (52) is disposed in the space formed by the first limiting plate (5111) and the second limiting plate (5112).

6. An in-situ water quality analyzer, characterized in that, The device includes an in-situ water measurement probe housing, a fiber optic spectrometer as described in any one of claims 1-5, a xenon lamp, a control circuit, a transmitting end sealing window, a receiving end sealing window, and an in-situ water measurement probe notch. The fiber optic spectrometer, the xenon lamp, and the control circuit are sealed within the in-situ water measurement probe housing. The transmitting end sealing window seals the through hole of the in-situ water measurement probe housing located on the xenon lamp side. The receiving end sealing window seals the through hole of the in-situ water measurement probe housing located on the fiber optic spectrometer side. The transmitting end sealing window and the receiving end sealing window form the in-situ water measurement probe notch. The fiber optic spectrometer, the xenon lamp, the transmitting end sealing window, and the receiving end sealing window are located on the same optical axis to allow light to pass through.

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