Laser Induced Spectroscopy

Abstract

The present invention discloses a laser induced spectrometer, comprising a grating, the grating being supported by a mounting structure, the mounting structure comprising a grating seat for fixing the grating; a support seat for back-to-back supporting the grating seat; the support seat having an unlockable clamping portion, the support seat being provided with an axial hole, a rotating shaft being passed through the axial hole, and the rotating shaft being fixed by the clamping portion; the grating seat being fixed on the rotating shaft; and a base, the support seat being fixed on the base by a detachable locking member, the locking member being sleeved with an adjusting gasket, and the adjusting gasket being used to adjust the local height of the support seat. The laser induced spectrometer of the present invention ensures the measurement precision and accuracy of the spectrometer by adjusting the position of the grating in multiple directions, and facilitates the on-site calibration of the spectrometer.

Description

Technical Field

[0001] The invention relates to the technical field of spectrum measurement, and in particular to a laser induced spectrometer. Background Art

[0002] Laser induced spectrometer has the technical advantages of being fast, in-situ, long-distance, and does not require sample preparation. It is used to detect and analyze material elements in any form. It is a cutting-edge product in scientific instrument development technology at home and abroad. It uses a pulsed laser beam to converge through a lens and irradiate the surface of a solid target, emitting light radiation with a specific wavelength to analyze the content components. The grating is the core component of the laser induced spectrometer. The laser that penetrates the target object is diffracted by the grating and enters the photodetector. The position of the grating is crucial to the precision and accuracy of the spectral measurement. In the prior art, the position of the grating installed inside the spectrometer structure cannot be adjusted, which affects the measurement precision and accuracy to a certain extent, and it is inconvenient to calibrate the spectrometer on site. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a laser induced spectrometer, which ensures the measurement precision and accuracy of the spectrometer by adjusting the position of the grating in multiple directions, and facilitates the on-site calibration of the spectrometer.

[0004] In order to solve the above technical problems, the present invention provides a laser induced spectrometer, including a grating, wherein the grating is supported by a mounting structure, and the mounting structure includes:

[0005] A grating seat, used for fixing the grating;

[0006] A support seat, used for back-to-back supporting the grating seat; the support seat has a clamping portion that can be unlocked, an axial hole is provided on the support seat, a rotating shaft is passed through the axial hole, and the rotating shaft is fixed by the clamping portion; the grating seat is fixed on the rotating shaft;

[0007] The support seat is fixed on the base through a detachable locking piece, and an adjusting gasket is sleeved on the locking piece, and the adjusting gasket is used to adjust the local height of the support seat.

[0008] In a preferred embodiment of the present invention, the support seat is further fixed to the base in a detachable manner by three groups of locking members; the three groups of locking members are distributed in a triangle, and at least one group of locking members is provided with an adjusting gasket.

[0009] In a preferred embodiment of the present invention, the local height of the support seat is further adjusted by changing the thickness of the adjusting gasket.

[0010] In a preferred embodiment of the present invention, the grating seat further includes a chassis and an outer sleeve, the center of the outer sleeve is provided with a stepped through hole, the chassis is accommodated in the stepped through hole, its axial first end face is connected to the rotating shaft, and its axial second end face abuts against the axial inner wall of the stepped through hole, and the grating is clamped and fixed between the second end face of the chassis and the axial inner wall of the stepped through hole.

[0011] In a preferred embodiment of the present invention, the outer wall of the chassis in the circumferential direction abuts against the inner wall of the stepped through hole in the circumferential direction, and the chassis and the outer sleeve are connected and fixed by a plurality of fixing members in the circumferential direction.

[0012] In a preferred embodiment of the present invention, one axial end of the outer sheath abuts against the support seat, and the other end opposite thereto is provided with a serrated surface.

[0013] In a preferred embodiment of the present invention, the clamping portion further includes a pair of elastic clamping arms arranged opposite to each other, and the pair of elastic clamping arms are connected by a locking rod. When the locking rod is rotated forward until the pair of elastic clamping arms are in contact, the rotating shaft is fixed; when the locking rod is rotated backward until the pair of elastic clamping arms are separated, the rotating shaft is unlocked to a free state.

[0014] In a preferred embodiment of the present invention, the laser induced spectrometer further comprises:

[0015] A laser, which is used to emit a pulsed laser beam that passes through the target object to be measured;

[0016] The laser light penetrating the target object to be measured is diffracted by the grating;

[0017] and a detector for receiving the diffracted light of the grating.

[0018] In a preferred embodiment of the present invention, the detector further includes a CCD chip, a signal collector and a main control board with a processor, the CCD chip is used to convert the diffraction light signal into an electrical signal, the signal collector collects the electrical signal and transmits it to the processor, and the processor obtains the chemical composition of the target object by analyzing the electrical signal.

[0019] In a preferred embodiment of the present invention, the laser induced spectrometer further comprises:

[0020] A first laser condenser, arranged on the optical path between the laser and the target object to be measured, and used for focusing the pulsed laser beam to act on the target object to be measured;

[0021] The second laser condenser is arranged on the optical path between the target object to be measured and the grating, and is used to focus the laser to act on the grating.

[0022] Beneficial effects of the present invention:

[0023] In the laser induced spectrometer of the present invention, the grating is fixed on the grating seat, the angle of the grating in the plane can be adjusted by rotating the rotating shaft, and the pitch angle and inclination of the grating can be adjusted by adjusting the gasket, so as to adjust the position of the grating in multiple directions, ensure the measurement precision and accuracy of the spectrometer, and facilitate the field calibration of the spectrometer. On the other hand, the mounting structure with optimized structural design has the characteristics of convenience of grating position adjustment and fixed stability after the grating position is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of a laser induced spectrometer in a preferred embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of the installation structure from a first viewing angle in a preferred embodiment of the present invention;

[0026] Figure 3 It is a structural schematic diagram from a second viewing angle of the installation structure in the preferred embodiment of the present invention.

[0027] Description of the numbers in the figure:

[0028] 1- Target object to be tested;

[0029] 2-grating, 21-grating seat, 22-support seat, 23-elastic clamp arm, 24-rotating shaft, 25-base, 26-locking piece, 27-adjusting gasket, 28-chassis, 29-outer sheath, 30-fixing piece, 31-serrated surface, 32-locking rod, 33-axis hole, 34-step through hole;

[0030] 4-laser, 6-CCD chip, 8-signal collector, 10-main control board, 12-first laser condenser, 14-second laser condenser. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0032] Example

[0033] This embodiment discloses a laser induced spectrometer, referring to Figure 1As shown, it includes a grating 2, a laser 4 and a detector. The laser 4 is used to generate and emit a pulsed laser beam that passes through the target object 1 to be measured; the laser penetrating the target object 1 to be measured is diffracted by the grating 2; the detector is used to receive the diffracted light of the grating 2. The detector includes a CCD chip 6, a signal collector 8 and a main control board 10 with a processor. The CCD chip 6 is used to convert the diffracted light signal of the grating 2 into an electrical signal. The signal collector 8 collects the electrical signal and transmits it to the processor. The processor obtains the chemical composition of the target object 1 to be measured by analyzing the electrical signal.

[0034] In order to improve the detection accuracy, the above-mentioned laser induced spectrometer also includes a first laser condenser 12 and a second laser condenser 14. The above-mentioned first laser condenser 12 is arranged on the optical path between the above-mentioned laser 4 and the target object 1 to be measured, and is used to focus the pulsed laser beam to act on the target object 1 to be measured; the above-mentioned first laser condenser 14 is arranged on the optical path between the above-mentioned target object 1 to be measured and the grating 2, and is used to focus the laser to act on the grating.

[0035] As described above, the grating 2 is supported by the mounting structure and arranged inside the spectrometer structure. As a further improvement of this embodiment, the grating 2 is supported by the mounting structure and can be adjusted in multiple directions. Figures 2-3 As shown, the installation structure is:

[0036] The above-mentioned mounting structure includes a grating seat 21, a support seat 22 and a base 25, wherein the above-mentioned grating seat 21 is used to fix the above-mentioned grating 2, the above-mentioned support seat 22 is used to support the above-mentioned grating seat 21 back to back, the above-mentioned support seat 22 is fixed to the above-mentioned base 25 through a detachable locking piece 26, and the mounting structure is fixed by the base 25 contacting the internal structure of the spectrometer.

[0037] Specifically, refer to Figures 2-3 As shown, the grating seat 21 includes a chassis 28 and an outer sleeve 29. The center of the outer sleeve 29 is provided with a stepped through hole 34. Here, the stepped through hole 34 is two sets of through holes that are coaxially connected to each other and have different radii. The chassis 28 is accommodated in the stepped through hole 34 (large radius through hole), and its first axial end face is connected to the rotating shaft 24, and its second axial end face abuts against the axial inner wall of the stepped through hole (the axial inner wall of the large radius through hole). When the chassis 28 and the outer sleeve 29 are fixed, the outer wall of the chassis 28 in the circumferential direction abuts against the inner wall of the stepped through hole (large radius through hole) in the circumferential direction, and the chassis 28 and the outer sleeve 29 are connected and fixed by a plurality of fixing members 30 in the circumferential direction.

[0038] The grating 2 is clamped and fixed between the second end face of the chassis 28 and the axial inner wall of the stepped through hole, and the laser penetrating the target object 1 is emitted from the small radius through hole of the stepped through hole 34 to the grating 2. One axial end of the outer sheath 29 abuts against the support seat 22, and the other end opposite thereto is provided with a serrated surface 31, which can effectively reduce the light loss of the diffracted light.

[0039] Reference Figures 2-3 As shown, the support seat 22 is provided with an axis hole 33, and the rotating shaft 24 is inserted into the axis hole 33 and fixed by a clamping part that can be unlocked. Specifically, the clamping part has a pair of elastic clamping arms 23 arranged opposite to each other, and the pair of elastic clamping arms 23 are connected by a locking rod 32. When the locking rod 32 is rotated forward until the pair of elastic clamping arms 23 are in contact, the rotating shaft 24 is fixed; when the locking rod 32 is rotated backward until the pair of elastic clamping arms 23 are separated, the rotating shaft 24 is unlocked to a free state.

[0040] The grating 2 is fixed on the grating seat 21. When the rotating shaft 24 is unlocked to a free state, the rotating shaft 24 is rotated as needed. The purpose of rotating the rotating shaft 24 is to adjust the angle of the grating 2 in the plane. When the grating 2 is rotated to the target angle, the locking rod 32 is rotated forward until the pair of elastic clamp arms 23 are fitted together. At this time, the rotating shaft 24 is stably fixed.

[0041] Furthermore, the support seat 22 is fixed to the base 25 via a removable locking member 26. Here, the locking member 26 preferably uses a screw and a threaded hole with threaded fit, or a screw and a nut with threaded fit. Considering the stability and reliability of fixation, the support seat 22 is removably fixed to the base 25 via three groups of locking members 26. The three groups of locking members 26 are distributed in a triangular shape. At least one group of locking members 26 is provided with an adjusting gasket 27. The adjusting gasket 27 is used to adjust the local height of the support seat 22. The pitch angle and inclination of the grating 2 are adjusted by adjusting the local height of the support seat 22, thereby realizing the multi-directional adjustment of the position of the grating 2.

[0042] In other technical solutions of this embodiment, the local height of the support seat 22 is adjusted by changing the thickness of the adjusting gasket 27, thereby adjusting the pitch angle and inclination of the grating 2.

[0043] In the laser induced spectrometer of the present invention, the grating is fixed on the grating seat, and the angle of the grating in the plane can be adjusted by rotating the rotating shaft. The pitch angle and inclination of the grating can be adjusted by adjusting the gasket, so as to adjust the position of the grating in multiple directions, ensure the measurement precision and accuracy of the spectrometer, and facilitate the field calibration of the spectrometer. On the other hand, the mounting structure with optimized structural design has the characteristics of convenience of grating position adjustment and fixed stability after grating position adjustment.

[0044] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A laser induced spectrometer, comprising a grating, characterized in that: The grating is supported by a mounting structure, the mounting structure comprising: A grating seat, used for fixing the grating; A support seat, used for back-to-back supporting the grating seat; the support seat has a clamping portion that can be unlocked, an axial hole is provided on the support seat, a rotating shaft is passed through the axial hole, and the rotating shaft is fixed by the clamping portion; the grating seat is fixed on the rotating shaft; A base, the support base is fixed to the base by a detachable locking member, an adjusting gasket is sleeved on the locking member, and the adjusting gasket is used to adjust the local height of the support base; The grating seat comprises a chassis and an outer sleeve, wherein the center of the outer sleeve is provided with a stepped through hole, the chassis is accommodated in the stepped through hole, the axial first end face of the chassis is connected to the rotating shaft, and the axial second end face of the chassis abuts against the axial inner wall of the stepped through hole, and the grating is clamped and fixed between the second end face of the chassis and the axial inner wall of the stepped through hole; One axial end of the outer sheath abuts against the support seat, and the other end opposite thereto is provided with a serrated surface; The clamping portion has a pair of elastic clamping arms arranged opposite to each other, and the pair of elastic clamping arms are connected by a locking rod. When the locking rod is rotated forward until the pair of elastic clamping arms are in contact, the rotating shaft is fixed; when the locking rod is rotated backward until the pair of elastic clamping arms are separated, the rotating shaft is unlocked to a free state.

2. The laser induced spectrometer according to claim 1, characterized in that: The support seat is detachably fixed to the base through three groups of locking pieces; the three groups of locking pieces are distributed in a triangle, and at least one group of locking pieces is provided with an adjusting gasket.

3. The laser induced spectrometer according to claim 1 or 2, characterized in that: The local height of the support seat is adjusted by changing the thickness of the adjusting gasket.

4. The laser induced spectrometer according to claim 1, characterized in that: The outer wall of the chassis in the circumferential direction abuts against the inner wall of the stepped through hole in the circumferential direction, and the chassis and the outer sleeve are connected and fixed by a plurality of fixing members in the circumferential direction.

5. The laser induced spectrometer according to any one of claims 1 to 2 and 4, characterized in that: The laser induced spectrometer further comprises: A laser, which is used to emit a pulsed laser beam that passes through the target object to be measured; The laser light penetrating the target object to be measured is diffracted by the grating; and a detector for receiving the diffracted light of the grating.

6. The laser induced spectrometer according to claim 5, characterized in that: The detector includes a CCD chip, a signal collector and a main control board with a processor. The CCD chip is used to convert the diffraction light signal into an electrical signal. The signal collector collects the electrical signal and transmits it to the processor. The processor obtains the chemical composition of the target object by analyzing the electrical signal.

7. The laser induced spectrometer according to claim 5, characterized in that: The laser induced spectrometer further comprises: A first laser condenser, arranged on the optical path between the laser and the target object to be measured, and used for focusing the pulsed laser beam to act on the target object to be measured; The second laser condenser is arranged on the optical path between the target object to be measured and the grating, and is used to focus the laser to act on the grating.

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