Fiber optic spectrometer and in-situ water meter thereof

Abstract

The invention discloses an optical fiber spectrometer and an in-situ water meter thereof, belongs to the technical field of optical analysis instruments, and solves the problem that the existing optical fiber spectrometer of a CT light path and an M light path cannot be used in a use scene due to limited geometric dimensions. The optical fiber spectrometer comprises a shell, and a slit assembly, a collimating mirror, a grating module, a focus lens module, a reflector module and a linear array photoelectric detector module which are arranged in the shell, wherein the slit assembly, the collimating mirror, the grating module, the focus lens module, the reflector module and the linear array photoelectric detector module are arranged in the shell; during use, incident light passes through the slit assembly, the collimating mirror, the grating module, the focus lens module, the reflector module and the linear array photoelectric detector module to form a spectrum detection light path. According to the optical fiber spectrometer, the angle of the reflector module can be adjusted, and the plane layout of the light path is reduced, so that the optical fiber spectrometer is slender in appearance and can be used in use scenes with limited geometric dimensions.

Description

Technical Field

[0001] The invention belongs to the technical field of optical analysis instruments, and in particular relates to an optical fiber spectrometer and an in-situ water measuring instrument thereof. Background Art

[0002] The conventional optical system structure of fiber optic spectrometers currently on the market includes a slit module, a collimator, a grating, a focusing lens, and a CCD photodetector; the optical path of the conventional fiber optic spectrometer is a Czerny-Turner (CT) structure, and its optical components are arranged on the same plane. Although people can use small-sized optical components to make conventional small CT optical path fiber optic spectrometers, the compression of its geometric dimensions on the plane will be greatly limited, so its appearance is difficult to achieve a slender shape. In this way, for some application scenarios that require the use of small-sized and slender optical fiber spectrometers, such as in-situ water measurement applications, the sealed cylindrical probe is immersed in water, so there is a need to use a slender optical fiber spectrometer. This conventional CT optical path spectrometer is difficult to meet actual needs; similarly, the conventional M optical path fiber optic spectrometer has the same shortcomings because its optical components are also arranged on the same plane.

[0003] Therefore, it is necessary to develop a small and slender fiber optic spectrometer for in-situ water quality measurement that can be immersed in different scenarios. Summary of the invention

[0004] The purpose of the present invention is to provide a fiber optic spectrometer and an in-situ water meter thereof, which solves the problem that the plane layout of the optical path of the existing CT optical path and M optical path of the fiber optic spectrometer is relatively large, and the optical components are arranged on the same plane, which cannot meet the application of small-sized and slender fiber optic spectrometers.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is implemented as follows: a fiber optic spectrometer comprises a shell and a slit assembly, a collimator, a grating module, a focusing mirror module, a reflector module and a linear array photodetector module arranged in the shell, wherein the slit assembly, the collimator, the grating module, the focusing mirror module, the reflector module and the linear array photodetector module are arranged on the inner periphery of the shell; when in use, the incident light passes through the slit assembly, the collimator, the grating module, the focusing mirror module, the reflector module and the linear array photodetector module to form a spectral detection optical path.

[0006] In some embodiments, the slit assembly, the grating module, the focusing mirror module, the linear array photodetector module, the collimating mirror and the reflector module are sequentially arranged on the inner circumference 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 reflector module and the linear array photodetector module in sequence to form a CT type optical path.

[0007] In some embodiments, the reflector module is provided in two, and the slit assembly, the collimating mirror, the focusing mirror module, the linear array photodetector module, one of the reflector modules, the grating module and the other reflector module are sequentially arranged on the inner circumference of the shell. When in use, the incident light passes through the slit assembly, the other reflector module, the collimating mirror, the grating module, the focusing mirror module, one of the reflector modules and the linear array photodetector module in sequence to form an M-type optical path.

[0008] In some embodiments, the slit assembly includes a fiber coupling connector and a slit, wherein the fiber coupling connector is used to fix the optical fiber or the coupling lens.

[0009] In some embodiments, the grating module includes a grating bracket and a grating arranged on the grating bracket, the grating bracket is arranged on the shell, the grating bracket includes a base, a bracket and a rotating shaft, the bracket and the grating are arranged on the base, and the grating is tightly attached to the bracket, the rotating shaft is arranged at the lower end of the base, and the rotating shaft is connected to the shell.

[0010] In some embodiments, an adjustment notch is provided at the upper end of the bracket, and a positioning block is provided on the base near the grating; fixing holes are also provided at the upper end of the bracket 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, and the reflector bracket is disposed on the housing.

[0012] In some embodiments, the reflector bracket includes a bracket body, a limit block and a rotating shaft, the limit block is fixed on one side of the bracket body, the rotating shaft is located on a side of the bracket body close to the limit block and is connected to the bracket body, and the rotating shaft is arranged on the shell.

[0013] In some embodiments, a first limiting plate and a second limiting plate for limiting the reflector are extended from the upper edge of the bracket body, and the reflector is arranged in a space formed by the first limiting plate and the second limiting plate.

[0014] Another technical solution of the present invention is achieved as follows: it includes an in-situ water measuring probe housing, the optical fiber spectrometer, a xenon lamp, a control circuit, a transmitting end sealing window, a receiving end sealing window, and an in-situ water measuring probe gap. The optical fiber spectrometer, the xenon lamp, and the control circuit are sealed in the in-situ water measuring probe housing. The transmitting end sealing window is used to seal the through hole of the in-situ water measuring probe housing on one side of the xenon lamp; the receiving end sealing window is used to seal the through hole of the in-situ water measuring probe housing on one side of the optical fiber spectrometer; the transmitting end sealing window and the receiving end sealing window form the in-situ water measuring 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 allow light to pass through.

[0015] Compared with the prior art, the fiber optic spectrometer of the present invention is different from the prior art in that the layout of the optical components is not located on the same plane. The addition of an angle-adjustable reflector module in the present invention greatly reduces the plane layout of the optical path, making the fiber optic spectrometer slender and usable in use scenarios with limited geometric dimensions. Therefore, the fiber optic spectrometer of the present invention is applied to an immersion-type in-situ water meter for water quality measurement in different scenarios, such as surface water, groundwater and offshore seawater measurement, to achieve online water quality detection without secondary pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a CT optical path fiber spectrometer in Example 1 of the present invention;

[0017] Figure 2 This is a schematic diagram of an M-light path optical fiber spectrometer in Example 2 of the present invention;

[0018] Figure 3 is a schematic structural diagram of a grating module in an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of a reflector module in an embodiment of the present invention;

[0020] Figure 5 is another structural schematic diagram of a reflector module in an embodiment of the present invention;

[0021] Figure 6 Schematic diagram of the structure of a linear array photoelectric detector module in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the in-situ water measuring instrument in Example 3 of the present invention;

[0023] Figure 8 This is a spectrum diagram of the in-situ tester in Example 3 of the present invention.

[0024] In the figure, 1. slit assembly, 2. collimator, 3. grating module, 31. grating bracket, 311. base, 312. bracket, 3121. adjustment notch, 3122. fixing hole, 32. grating, 4. focusing mirror module, 5. reflector module, 51. reflector bracket, 511. bracket body, 5111. first limit plate, 5112. second limit plate, 512. limit block, 52. reflector, 6. linear array photoelectric detector module, 61. linear array photoelectric detector photosensitive surface. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] In the description of the present invention, it should be clarified that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal" and the like indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not mean that the device or element referred to must have a specific orientation or position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1

[0028] Embodiment 1 of the present invention provides a fiber optic spectrometer, such as Figure 1 As shown, it includes a shell and a slit assembly 1, a collimator 2, a grating module 3, a focusing mirror module 4, a reflector module 5 and a linear array photodetector module 6 arranged in the shell. The slit assembly 1, the grating module 3, the focusing mirror module 4, the linear array photodetector module 6, the collimator 2 and the reflector module 5 are sequentially arranged on the inner periphery of the shell; when in use, the incident light passes through the slit assembly 1, the collimator 2, the grating module 3, the focusing mirror module 4, the reflector module 5 and the linear array photodetector module 6 in sequence to form a CT type optical path.

[0029] After adopting the above scheme, the difference between the fiber optic spectrometer of the present invention and the prior art is that the layout of the optical components is not located on the same plane. The position of the internal optical components is adjusted as needed, so that the volume of the fiber optic spectrometer is reduced and becomes slender. The fiber optic spectrometer of the present invention can be applied to an immersion in-situ water meter for water quality measurement in different scenarios, such as surface water, groundwater and offshore seawater measurement, to achieve online water quality detection without secondary pollution.

[0030] In the specific implementation process of this 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. The fiber coupling joint is used to fix the optical fiber or coupling lens, and the optical fiber or coupling lens is used to guide the measured light into the slit assembly 1. After passing through the slit, the measured light forms a thin linear light and is emitted to the collimator 2; after being collimated by the collimator 2, it is emitted to the grating module 3, and after being diffracted and split by the grating module 3, it forms a monochromatic light continuously distributed in space and is emitted to the focusing lens module 4; after being focused by the focusing lens module 4, it is emitted to the reflector module 5; after being reflected by the reflector 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 a linear continuously distributed monochromatic light, and after being photoelectrically converted 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 this embodiment, Figure 3 As shown, the grating module 3 includes a grating bracket 31 and a grating 32 arranged on the grating bracket 31, the grating bracket 31 is arranged on the shell, the grating bracket 31 includes a base 311, a bracket 312 and a rotating shaft, the bracket 312 and the grating 32 are arranged on the base 311, and the grating 32 is tightly attached to the bracket 312, the rotating shaft is arranged at the lower end of the base 311, and the rotating shaft is connected to the shell.

[0033] In the specific implementation process of this embodiment, Figure 3 As shown, the upper end of the bracket 312 is provided with an adjustment notch 3121 , and a positioning block 3111 is provided on the base 311 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 .

[0034] More specifically, the grating 32 is fixed to the grating bracket 31 by a positioning block 3111, and a tool is used to adjust the rotation of the grating bracket 31 by adjusting the notch 3121. The rotation of the grating bracket 31 is achieved by a rotating shaft, and the rotating shaft is inserted into the hole of the CT optical path folding fiber spectrometer in a tight fit manner. The rotation of the grating bracket 31 is used to adjust the position of the spectral light in the X-axis direction of the linear array photodetector 6 (that is, the direction in which the pixels of the linear array photodetector 6 are arranged in sequence); when the adjustment of the grating bracket 31 is completed, screws are used to fix the grating bracket 31 to the CT optical path folding fiber spectrometer through the fixing holes 3122 on both sides of the adjustment notch 3121. The present embodiment is not limited to screws, bolts or pins, and can also be fixed in other matching ways.

[0035] In the specific implementation process of this embodiment, Figure 4 and Figure 5 As shown, the reflector module 5 includes a reflector bracket 51 and a reflector 52 arranged on the reflector bracket 51, and the reflector bracket 51 is arranged on the housing.

[0036] In the specific implementation process of this embodiment, Figure 4 and Figure 5 As shown, the reflector bracket 51 includes a bracket body 511, a limit block 512 and a rotating shaft. The limit block 512 is fixed on one side of the bracket body 511, the rotating shaft is located on the side of the bracket body 511 close to the limit block 512 and is connected to the bracket body 511, and the rotating shaft is arranged on the shell.

[0037] In the specific implementation process of this embodiment, Figure 4 and Figure 5 As shown, a first limiting plate 5111 and a second limiting plate 5112 for limiting the reflector 52 are extended from the upper edge of the bracket body 511 , and the reflector 52 is arranged in a space formed by the first limiting plate 5111 and the second limiting plate 5112 .

[0038] More specifically, the reflector 52 is fixed on the reflective bracket 51, and the reflector 52 is arranged in a space formed by the first limiting plate 5111 and the second limiting plate 5112, and the first limiting plate 5111 and the second limiting plate 5112 are used to limit the position in two directions on the same plane. The rotation of the reflective bracket 51 is achieved by adjusting the limiting block 512, so as to adjust the position of the spectral light in the Y-axis direction of the linear array photoelectric detector 6 (i.e., the direction perpendicular to the direction in which the pixels of the linear array photoelectric detector 6 are arranged in sequence).

[0039] Further, such as Figure 4As shown, the stopper 512 and the bracket body 511 are L-shaped, and a through hole and a screw hole are arranged in sequence on the stopper 512. The stopper 512 is connected to the housing through two connecting pieces, and the connecting piece can be a screw or other parts that play a fastening or jacking role. The connecting piece is placed in the through hole, and the connecting piece is tightened to match the screw hole on the housing to provide a fastening force. In addition, the connecting piece is placed in the screw hole and tightened to contact the housing to provide a jacking force. The rotation of the reflector bracket 51 and the locking and fixing of the reflector bracket 51 are achieved by adjusting the tightness of the two connecting pieces. The reflector bracket 51 rotates around the rotating shaft, and the rotating shaft is placed in the hole on the CT optical path fiber spectrometer in a tight fit.

[0040] Further, such as Figure 5 As shown, the limit block 512 and the bracket body 511 are T-shaped, and two through holes are symmetrically arranged on the limit block 512. The limit block 512 is connected to the shell through two connecting parts. The connecting parts are screws or other fastening parts. The two connecting parts are placed in the through holes, and the two connecting parts are alternately tightened to match the screw holes on the shell. The rotation of the reflector bracket 51 and the locking and fixing of the reflector bracket 51 are achieved by adjusting the tightness of the two connecting parts. The reflector bracket 51 rotates around the rotating shaft, and the rotating shaft is placed in the hole on the CT optical path fiber spectrometer in a tight fit.

[0041] In the specific implementation process of this embodiment, Figure 6 As shown, a linear array photoelectric detector light-sensitive surface 61 is provided in the linear array photoelectric detector module 6 .

[0042] More specifically, a linear array photodetector photosensitive surface 61 is provided in the linear array photodetector module 6, and the linear array photodetector photosensitive surface 61 has a horizontal X-axis and a vertical Y-axis. The linear array photodetector module 6 can be a device such as a CCD, a CMOS or an APD array. The linear array photodetector photosensitive surface 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 photodetector photosensitive surface 61, perpendicular to the vertical Y-axis of the linear array photodetector photosensitive surface 61, and forms a linear continuous distribution of monochromatic light along the horizontal X-axis of the linear array photodetector photosensitive surface 61. After the photoelectric conversion of the linear array photodetector module 6, the measured spectrum can be output in the form of an electrical signal, that is, the distribution of light intensity with the pixels of the linear array photodetector photosensitive surface 61. If the wavelength of the optical fiber spectrometer of the present invention is calibrated using a standard lamp, the spectrum can also be expressed as the distribution of light intensity with wavelength.

[0043] The working process provided by the embodiment 1 of the present invention is as follows: the measured light forms a thin linear light after passing through the slit and is emitted to the collimator 2; after being collimated by the collimator 2, it is emitted to the grating module 3, and after being diffracted and split by the grating module 3, it forms a monochromatic light continuously distributed in space and is emitted to the focusing mirror module 4; the rotation of the grating bracket 31 is adjusted by adjusting the notch 3121 to adjust the position of the spectrum light in the X-axis direction of the linear array photoelectric detector 6; after being focused by the focusing mirror module 4, it is emitted to the reflector module 5; the rotation of the reflector bracket 51 is achieved by adjusting the limit block 512 to adjust the position of the spectrum light in the Y-axis direction of the linear array photoelectric detector 6; after being reflected by the reflector 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 a linear continuously distributed monochromatic light, and the optical path formed is a CT type optical path, and after the photoelectric conversion of the linear array photoelectric detector 6, the measured spectrum is output in the form of an electrical signal.

[0044] Example 2

[0045] This embodiment 2 provides a fiber optic spectrometer, such as Figure 2 As shown, the reflector module 5 is provided with two, and the slit assembly 1, the collimator 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 shell. When in use, the incident light passes through the slit assembly 1, the other reflector module 5, the collimator 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.

[0046] The difference between the present embodiment 2 and the embodiment 1 is that the present embodiment 2 has two reflector modules 5, and the measured light is introduced into the slit assembly 1 by using an optical fiber or a coupling lens. After passing through the slit, the measured light forms a thin linear light and is emitted to a reflector module 5 at 45 degrees. After being reflected by the 45-degree reflector module 5, it is emitted to the collimator 2 at an angle of 45 degrees. After being collimated by the collimator 2, it is emitted to the grating module 3. After being diffracted and split by the grating module 3, it forms a monochromatic light continuously distributed in space and is emitted to the focusing mirror module 4; after being focused by the focusing mirror module 4, it is emitted to another reflector module 5; after being reflected by another reflector module 5 at a certain angle, such as 45 degrees, it is emitted to the linear array photodetector 6, and is focused on the linear array photodetector 6 to form a linear continuously distributed monochromatic light. After being photoelectrically converted by the linear array photodetector 6, the measured spectrum can be output in the form of an electrical signal.

[0047] The working process provided by the second embodiment of the present invention is as follows: the measured light forms a thin linear light after passing through the slit and is emitted to a reflector module 5 at a 45-degree angle. After being reflected by the 45-degree reflector module 5, it is emitted to the collimator 2 at a 45-degree angle. After being collimated by the collimator 2, it is emitted to the grating module 3. After being diffracted and split by the grating module 3, it forms a monochromatic light continuously distributed in space and is emitted to the focusing lens module 4. The rotation of the grating bracket 31 is adjusted by adjusting the notch 3121 to adjust the position of the spectral light in the X-axis direction of the linear array photodetector 6. After passing through the focusing lens After focusing, the module 4 is directed to another reflector module 5; the rotation of the reflector bracket 51 is achieved by adjusting the limit block 512 to adjust the Y-axis position of the spectral light on the linear array photodetector 6; after being reflected at a certain angle, such as 45 degrees, by another reflector module 5, the spectral light is directed to the linear array photodetector 6 and focused on the linear array photodetector 6 to form a linear continuously distributed monochromatic light. The formed optical path is an M-type optical path. After photoelectric conversion by the linear array photodetector 6, the measured spectrum is output in the form of an electrical signal.

[0048] Example 3

[0049] Embodiment 3 of the present invention provides an in-situ water measuring instrument, such as Figure 7 As shown, Figure 7 In the embodiment, a is the in-situ water measuring probe housing, b is the optical fiber spectrometer in Examples 1 and 2, c is the xenon lamp, d is the control circuit, e is the receiving end sealing window, f is the transmitting end sealing window, and g is the in-situ water measuring probe gap. The in-situ water measuring instrument includes the in-situ water measuring probe housing a, the optical fiber spectrometer b in Examples 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 housing a. The transmitting end sealing window f is used to seal the through hole of the in-situ water measuring probe housing a located 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 housing a located 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 allow light to pass through.

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

[0051] Example 3: The optical fiber spectrometer with M optical path in Example 2 is used to measure the spectrum of the xenon lamp from 200 nanometers to 820 nanometers. Figure 8 As shown, it can be seen that this spectrum covers the spectrum involved in in-situ water measurement, including 220 nanometers and 275 nanometers for measuring total nitrogen, 600 nanometers for measuring chemical oxygen demand COD, 660 nanometers for measuring ammonia nitrogen, and 700 nanometers for measuring total phosphorus.

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

[0053] In summary, the fiber optic spectrometer of the present invention is different from the prior art in that the optical components are not located on the same plane. The addition of the reflector module in the present invention not only allows the angle of the focused spectral light beam to be adjusted and shortens the optical path, but also adjusts the position of the internal optical components as needed, making the fiber optic spectrometer compact. The fiber optic spectrometer of the present invention is applied to an in-situ water meter for water quality measurement in different scenarios, such as surface water, groundwater and offshore seawater, to achieve online water quality detection without secondary pollution.

[0054] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A fiber optic spectrometer, characterized in that: The invention comprises a shell, and a slit assembly (1), a collimator (2), a grating module (3), a focusing mirror module (4), a reflector module (5) and a linear array photodetector module (6) arranged in the shell, wherein the slit assembly (1), the collimator (2), the grating module (3), the focusing mirror module (4), the reflector module (5) and the linear array photodetector module (6) are arranged on the inner periphery of the shell; when in use, incident light passes through the slit assembly (1), the collimator (2), the grating module (3), the focusing mirror module (4), the reflector module (5) and the linear array photodetector module (6) to form a spectrum detection light path.

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

3. The optical fiber spectrometer according to claim 1, characterized in that: The reflector module (5) is provided in two pieces, and the slit assembly (1), the collimator (2), the focusing lens module (4), the linear array photoelectric detector 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. When in use, incident light sequentially passes through the slit assembly (1), the other of the reflector modules (5), the collimator (2), the grating module (3), the focusing lens module (4), one of the reflector modules (5) and the linear array photoelectric detector module (6) to form an M-shaped optical path.

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

5. The optical fiber spectrometer according to claim 4, characterized in that: The grating module (3) comprises a grating bracket (31) and a grating (32) arranged on the grating bracket (31), wherein the grating bracket (31) is arranged on the shell; the grating bracket (31) comprises a base (311), a bracket (312) and a rotating shaft, wherein the bracket (312) and the grating (32) are arranged on the base (311), and the grating (32) is tightly attached to the bracket (312), and the rotating shaft is arranged at the lower end of the base (311), and the rotating shaft is connected to the shell.

6. The optical fiber spectrometer according to claim 6, characterized in that: An adjustment notch (3121) is provided at the upper end of the bracket (312), and a positioning block (3111) is provided on the base (311) at a position close to the grating (32); and fixing holes (3122) are also provided at the upper end of the bracket (312) on both sides of the adjustment notch (3121).

7. The optical fiber spectrometer according to any one of claims 1 to 3, characterized in that: The reflector module (5) comprises a reflector bracket (51) and a reflector (52) arranged on the reflector bracket (51); the reflector bracket (51) is arranged on the housing.

8. The optical fiber spectrometer according to claim 7, characterized in that: The reflector bracket (51) comprises a bracket body (511), a limit block (512) and a rotating shaft, wherein the limit block (512) is fixedly arranged on one side of the bracket body (511), the rotating shaft is located on a side of the bracket body (511) close to the limit block (512) and is connected to the bracket body (511), and the rotating shaft is arranged on the shell.

9. The optical fiber spectrometer according to claim 8, characterized in that: A first limiting plate (5111) and a second limiting plate (5112) for limiting the position of the reflecting mirror (52) are extended from the upper edge of the bracket body (511), and the reflecting mirror (52) is arranged in a space formed by the first limiting plate (5111) and the second limiting plate (5112).

10. An in-situ water measuring instrument, characterized in that: It includes an in-situ water measuring probe housing, an optical fiber spectrometer as described in any one of claims 1 to 9, a xenon lamp, a control circuit, a transmitting end sealing window, a receiving end sealing window, and an in-situ water measuring probe gap. The optical fiber spectrometer, the xenon lamp, and the control circuit are sealed in the in-situ water measuring probe housing. The transmitting end sealing window is used to seal the through hole of the in-situ water measuring probe housing on one side of the xenon lamp; the receiving end sealing window is used to seal the through hole of the in-situ water measuring probe housing on one side of the optical fiber spectrometer; the transmitting end sealing window and the receiving end sealing window form the in-situ water measuring 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 allow light to pass through.

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