CN113514153A - Method and device for effectively improving detection precision of spectrometer - Google Patents
Method and device for effectively improving detection precision of spectrometer Download PDFInfo
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- CN113514153A CN113514153A CN202110972266.2A CN202110972266A CN113514153A CN 113514153 A CN113514153 A CN 113514153A CN 202110972266 A CN202110972266 A CN 202110972266A CN 113514153 A CN113514153 A CN 113514153A
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0202—Mechanical elements; Supports for optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G01J3/28—Investigating the spectrum
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Abstract
The invention provides a method and a device for effectively improving the detection precision of a spectrometer, comprising the following steps: keeping the laser horizontal; mounting an infrared light source on an infrared light source mounting frame; mounting a collimating lens on a collimating lens frame; enabling a horizontal plane of a focus of the collimating mirror to coincide with a horizontal plane of the infrared light source, adjusting the transverse position of the infrared light source, and fixing the transverse position of the infrared light source after a vertical plane of the focus coincides with a vertical plane of the infrared light source; adjusting the angle of the collimating lens to enable scattered light emitted by the laser to form light spots on the intersection line of the horizontal plane and the vertical plane where the infrared light source is located; and adjusting the longitudinal position of the infrared light source, and fixing the longitudinal position of the infrared light source when the center of the infrared light source is superposed with the focal position of the collimating mirror. The method and the device provided by the invention can fundamentally solve the collimation problem of the infrared light source by collecting the stray light and matching the light path arrangement and the adjusting mechanism.
Description
Technical Field
The invention relates to the technical field of spectrometers, in particular to a method and a device for effectively improving detection precision of a spectrometer.
Background
Ideally, the point light source of the spectrometer is capable of radiating infinite energy outwards, and has ideal collimation. However, in reality, any light source has a certain light emitting area, and to obtain a larger amount of energy, an extended light source having a larger surface size is required. The deviation of the aperture size and the position of the extended light source will affect the interference signal and limit the resolution index of the instrument. The existing general means for eliminating such influences are:
1. calibrating the wavelength by a standard substance spectrum comparison mode;
2. the positions of the light source and the collimating mirror are positioned by improving the processing precision;
these two approaches have the following disadvantages:
1. the calibration method cannot be completely calibrated, and some deviation still exists, so that the wavelength error of each instrument is inconsistent.
2. The calibration is carried out by improving the processing precision, so that the processing difficulty and cost are increased, errors are not eliminated, and the errors between the tables are still uncertain.
Disclosure of Invention
The invention aims to overcome one of the defects in the prior art, provides a method and a device for effectively improving the detection precision of a spectrometer, and can effectively solve the problem of inaccurate assembly of a light source so as to improve the detection precision of the spectrometer.
A method for effectively improving the detection precision of a spectrometer comprises the following steps:
-mounting the laser of the laser incidence module on a laser mounting frame and keeping the laser horizontal;
mounting an infrared light source of the infrared light source module on the infrared light source mounting frame;
mounting a collimating lens of the infrared light source module on a collimating lens frame;
observing the position of the focus of the collimating mirror by using an imaging plate to ensure that the horizontal plane of the focus is superposed with the horizontal plane of the infrared light source, and adjusting the transverse position of the infrared light source to ensure that the transverse position of the infrared light source is fixed after the vertical plane of the focus is superposed with the vertical plane of the infrared light source;
adjusting the angle of the collimating mirror to enable scattered light emitted by the laser to be collected by the collimating mirror, and forming a light spot on an intersection line of a horizontal plane where the infrared light source is located and a vertical plane, wherein the position of the light spot is the accurate position of the focus of the collimating mirror;
and adjusting the longitudinal position of the infrared light source, and fixing the longitudinal position of the infrared light source when the center of the infrared light source is completely coincident with the accurate position of the focus of the collimating mirror.
The utility model provides an effectively improve spectrum appearance and survey device of precision, spectrum appearance include base, infrared light source module, laser incident module includes laser instrument support and laser instrument, laser instrument support fixed mounting is on the base, and the laser instrument is installed on the laser instrument support, infrared light source module includes collimating mirror, collimating mirror seat, light source support, light source seat and light source, collimating mirror seat fixed mounting is on the base, and collimating mirror pivoted installs on the collimating mirror seat, light source support mounting is on the base and along base lateral shifting, light source seat fixed mounting is on the light source support, the light source is installed on the light source seat to along light source seat longitudinal shifting.
Preferably, the heat insulation support is fixedly installed on the base, a transverse long hole is formed in the light source support, and the light source support and the heat insulation support are fixedly connected at the long hole through a bolt.
Further, a longitudinal light source mounting hole is formed in the middle of the light source seat, a vertical jackscrew mounting hole communicated with the light source mounting hole is formed in the upper portion of the light source seat, the light source penetrates through the longitudinal light source mounting hole, and a jackscrew is mounted at the jackscrew mounting hole.
Optimized, collimating mirror seat is L shape structure, including integrated into one piece's horizontal stand and vertical seat, horizontal stand fixed mounting is on the base, the collimating mirror middle part is installed on vertical seat through pivot pivoted, and the collimating mirror has seted up round screw counter sink in the periphery of pivot, passes through counter sink bolted connection in screw counter sink department between collimating mirror and the vertical seat, and the diameter of counter sink bolt is less than the aperture of screw counter sink.
Further, the laser support is two, and the arc laser instrument has been seted up at laser support top and has stepped down, and the laser instrument department of stepping down installs elastic gasket, the laser instrument top is equipped with the elasticity preforming, and bolt and laser support fixed connection are passed through to the both ends of elasticity preforming.
Further, the device for effectively improving the detection precision of the spectrometer further comprises an interferometer module and a convergence module which are fixedly installed on the base.
Optimized, a light source cover is fixedly mounted on the light source support, a light transmitting hole is formed in the upper side portion of the light source cover, a jackscrew mounting hole is formed in the top of the light source cover, and a diaphragm is fixedly mounted in the light source cover.
The invention has the beneficial effects that:
the invention has the following beneficial effects:
the invention collects useless stray light, and through the cooperation of the light path arrangement and the adjusting mechanism, the collimation problem of the infrared light source can be fundamentally solved, so that the instrument can keep good consistency in batch production and manufacture, and the detection precision of the spectrometer is improved.
Drawings
FIG. 1 is one of the structural diagrams of the present invention;
FIG. 2 is a second block diagram of the present invention;
FIG. 3 is a schematic structural diagram of a laser incident module;
FIG. 4 is a schematic view of the effect of an extended light source;
FIG. 5 is a schematic view of an extended light source offset;
FIG. 6 is an out-of-focus diagram of an extended light source;
in the figure, 1, a laser support, 2, a laser, 3, a base, 4, a vertical seat, 5, an interferometer module, 6, a horizontal seat, 7, a light source, 8, a light source seat, 9, a heat insulation support, 10, a light source cover, 11, a collimating mirror, 12, a countersunk head bolt, 13, a rotating shaft, 14, a convergence module, 15, a jackscrew mounting hole, 16, a light source support, 17, a transverse long hole, 18, an elastic pressing sheet, 19, an elastic gasket and 20 are abducted by the laser.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings.
A method for effectively improving the detection precision of a spectrometer comprises the following steps:
-mounting the laser of the laser incidence module on a laser mounting frame and keeping the laser horizontal;
mounting an infrared light source of the infrared light source module on the infrared light source mounting frame;
mounting a collimating lens of the infrared light source module on a collimating lens frame;
observing the position of the focus of the collimating mirror by using an imaging plate to ensure that the horizontal plane of the focus is superposed with the horizontal plane of the infrared light source, and adjusting the transverse position of the infrared light source to ensure that the transverse position of the infrared light source is fixed after the vertical plane of the focus is superposed with the vertical plane of the infrared light source;
adjusting the angle of the collimating mirror to enable scattered light emitted by the laser to be collected by the collimating mirror, and forming a light spot on an intersection line of a horizontal plane where the infrared light source is located and a vertical plane, wherein the position of the light spot is the accurate position of the focus of the collimating mirror;
and adjusting the longitudinal position of the infrared light source, and fixing the longitudinal position of the infrared light source when the center of the infrared light source is completely coincident with the accurate position of the focus of the collimating mirror.
The utility model provides an effectively improve spectrum appearance and survey device of precision, the spectrum appearance includes base 3, infrared light source module, laser incidence module, and laser incidence module includes laser instrument support 1 and laser instrument 2, and laser instrument support fixed mounting can pass through bolt fixed connection between the two on the base, also can adopt other connected modes fixed, and the laser instrument is installed on the laser instrument support.
Infrared light source module includes collimating mirror 11, collimating mirror seat, light source support 16, light source seat 8 and light source 7, collimating mirror seat fixed mounting can pass through bolt fixed connection between the two on the base, also can adopt other connected modes fixed, and the collimating mirror pivoted is installed on the collimating mirror seat, and light source support mounting is on the base and along base lateral shifting, and light source seat fixed mounting is on light source support, can pass through bolt fixed connection between light source seat and the light source support, also can integrated into one piece or adopt other fixed modes, and the light source is installed on light source seat to along light source seat longitudinal shifting.
Preferably, the heat insulation support 9 is fixedly installed on the base, the transverse long hole 17 is formed in the light source support, the light source support and the heat insulation support are fixedly connected at the long hole through a bolt, the light source support can drive the light source to transversely move along the heat insulation support, and therefore the center of the light source is transversely aligned with the focus of the collimating mirror.
Further, vertical light source mounting hole has been seted up at light source seat middle part, and vertical jackscrew mounting hole with light source mounting hole intercommunication is seted up on light source seat upper portion, the light source passes vertical light source mounting hole, jackscrew mounting hole department installs the jackscrew, and the light source can remove along the light source mounting hole of light source seat, thereby makes the center of light source and the focus of collimating mirror adjust the calibration of realization light source position well in vertical.
Optimized, collimating mirror seat is L shape structure, including integrated into one piece's horizontal stand 6 and vertical seat 4, horizontal stand fixed mounting is on the base, the collimating mirror middle part is installed on vertical seat through pivot 13 pivoted, and the collimating mirror has seted up round screw counter bore in the periphery of pivot, passes through counter bolt 12 at screw counter bore department between collimating mirror and the vertical seat and is connected, and the diameter of counter bolt is less than the aperture of screw counter bore, and the installation of collimating mirror is more firm to can make the collimating mirror along the rotatory certain angle of pivot, realize that the collimating mirror collects the stray light that the laser instrument sent.
Further, the laser support is two, and the laser support top has been seted up the arc laser instrument and has stepped down 20, and the laser instrument department of stepping down is installed elastic gasket 19, the laser instrument top is equipped with elasticity preforming 18, and bolt and laser support fixed connection are passed through to the both ends of elasticity preforming, through the setting of elasticity preforming to and the setting of elasticity gasket number of pieces, can adjust the outgoing angle of the laser beam that the laser instrument jetted out, make it keep the level.
Further, the device for effectively improving the detection precision of the spectrometer further comprises an interferometer module 5 and a convergence module 14 which are fixedly installed on the base.
Optimally, a light source cover 10 is fixedly installed on the light source support, a light transmitting hole is formed in the upper side portion of the light source cover, a jackscrew installation hole 15 is formed in the top portion of the light source cover, a diaphragm (not shown) is fixedly installed in the light source cover, the diaphragm is arranged on the light source cover, and light beams emitted by the infrared light source are incident on the collimating mirror after being limited by the diaphragm. The light source cover also plays a role in protecting the light source so as to prevent the light source from being influenced by external air flow, temperature and the like to cause unstable light emission.
Principle of the technical problem:
influence of aperture
The optical path diagram of the interferometer in the spectrometer can be simplified as shown in fig. 4, and then the maximum included angle 2 θ between the extended light source and the rotating shaft can be expressed as:
in the formula: r is the radius of the extended light source, and f is the focal length of the collimating mirror.
The solid angle of the extended light source is then:
Ω＝2π(1-cosθ) (2)
when the interferometer works, after the movable reflector generates displacement d, the paraxial light beam can generate an extra optical path difference (delta):
wherein: and x is the optical path difference generated by the light beam parallel to the rotating shaft 2 d.
In the range of an incident solid angle omega of the extended light source, for an incident monochromatic waveband v, the intensity of an interference signal is obtained as follows:
obviously, due to the existence of the solid angle of the extended light source, the wave number value v of the monochromatic light shifts to a lower wave number, and the shift is equal to
At the same time, the interference signal is subjected to a factor
The influence of (c). Then under the influence of the extended light source, the modulation efficiency of the interference signal is:
with the movement of the movable mirror, appear
When this happens, its modulation efficiency drops to zero. When the optical path difference continues to increase, the phase of the interference signal will be reversed, so the maximum value of the aperture of the extended light source is:
in the formula, vmaxRepresents the maximum range of the spectrum of light,
i.e. the maximum resolution of the instrument.
On the other hand, if a fixed extended optical aperture is considered, there is a limit to the resolution of the interference signal, that is, the extended range of the wave number v is:
second, influence of offset
As shown in fig. 5, assuming that the light source is a circular surface light source, monochromatic light with wave number ν is emitted, the diameter of the monochromatic light is 2R, there is an offset error of s from the ideal position by extending the light source in the direction perpendicular to the rotation axis, the focal length of the collimator lens is f, and R is the distance between any point on the light source and the intersection of the rotation axis and the light source, α is R/f, β is s/f, and θ is R/f.
For a given wavenumber v there will be some spread, when α ≦ θ - β, corresponding to truncating the diameter of the spread source to 2(R-s), leading to the same conclusion as in the analysis of the effect of the aperture, i.e. the limit of resolution is
δν＝νΩ/2π。 (8)
When r ∈ (θ - β, θ + β), the resolution limit of the obtained interference signal is:
third, the influence of defocus
The case when the center of the area light source is at a distance Δ from the focal point, as in fig. 6, is when Δ > 0, i.e., the distance between the light source and the collimator lens is f + Δ. If Δ is small, considering the case when the light beam incident on the interferometer is still parallel, the influence at this time can be simplified to one or two cases, which affects both the accuracy and resolution of the spectrum.
Through the above derivation and demonstration, it can be derived: the collimation of the source position and the beam is very important for the spectrometer. In the assembling and debugging process of the instrument, how to position the position of the light source is a key problem in the production of the instrument. In the existing method for eliminating the influence, due to the processing error and the light-emitting position error of the light source and the focal length and angle error of the collimating mirror, in the production and manufacturing process of the instrument, the processing precision of other mechanical parts is higher, the positioning is more accurate, and the central position of the light source and the focal position of the collimating mirror can not be completely coincided under the condition of no fine adjustment.
Due to these errors, the spectra may drift and there may be errors between each other. When a spectrometer is delivered from a factory, a spectrometer manufacturer calibrates a spectral wavelength, compares a standard spectrogram of a standard substance, such as a polystyrene film, carbon monoxide gas and the like, with an actually measured spectrogram, and calibrates the spectral wavelength through calibration of a characteristic peak position.
However, since the shift of the spectral wavelength is a complex function, the wavelength is not only shifted but also broadened. Moreover, it is not easy to calibrate the whole spectrum, and only individual points can be selected to calibrate the whole spectrum, so that the calibration method still has errors. This error is not the same for each instrument.
In the application, the position arrangement of the infrared light source, the laser, the interferometer and the collimating mirror is the same as that of the existing spectrometer, the structure is simple, the cost is low, some 'useless' stray light of the laser is collected through the rotation of the collimating mirror, so that scattered light emitted by the laser is converged by the collimating mirror to form light spots, and the light is the accurate position of the focus of the collimating mirror; then the position of the infrared light source is moved to enable the center of the infrared light source to coincide with the light spot, namely the accurate position of the focus of the collimating mirror, and then the position of the infrared light source is fixed, so that the collimating problem of the infrared light source can be fundamentally solved, the instrument can keep good consistency in batch production and manufacturing, and the detection precision of the spectrometer is improved.
In summary, the method and the device for effectively improving the detection accuracy of the spectrometer provided by the invention can fundamentally solve the collimation problem of the infrared light source by collecting 'useless' stray light and matching the light path arrangement and the adjusting mechanism, so that the instrument can keep good consistency in batch production and manufacturing, and the detection accuracy of the spectrometer is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for effectively improving the detection precision of a spectrometer is characterized by comprising the following steps:
-mounting the laser of the laser entrance module on a laser mount and keeping the laser horizontal;
mounting the infrared light source of the infrared light source module on an infrared light source mounting frame;
mounting a collimating lens of the infrared light source module on a collimating lens frame;
observing the position of the focus of the collimating mirror by using an imaging plate to ensure that the horizontal plane of the focus is superposed with the horizontal plane of the infrared light source, and adjusting the transverse position of the infrared light source to ensure that the transverse position of the infrared light source is fixed after the vertical plane of the focus is superposed with the vertical plane of the infrared light source;
adjusting the angle of the collimating mirror to enable scattered light emitted by the laser to be collected by the collimating mirror, and forming a light spot on an intersection line of a horizontal plane where the infrared light source is located and a vertical plane, wherein the position of the light spot is the accurate position of the focus of the collimating mirror;
and adjusting the longitudinal position of the infrared light source, and fixing the longitudinal position of the infrared light source when the center of the infrared light source is completely coincident with the accurate position of the focus of the collimating mirror.
2. The utility model provides an effectively improve spectrum appearance and survey device of precision, spectrum appearance include base, infrared light source module, laser incident module, its characterized in that, laser incident module includes laser instrument support and laser instrument, laser instrument support fixed mounting is on the base, and the laser instrument is installed on the laser instrument support, infrared light source module includes collimating mirror, collimating mirror seat, light source support, light source seat and light source, collimating mirror seat fixed mounting is on the base, and collimating mirror pivoted installs on the collimating mirror seat, light source support mounting is on the base and along base lateral shifting, light source seat fixed mounting is on the light source support, the light source is installed on the light source seat to along light source seat longitudinal shifting.
3. The device of claim 2, wherein the base is fixedly provided with a heat insulation support, the light source support is provided with a transverse long hole, and the light source support and the heat insulation support are fixedly connected at the long hole through a bolt.
4. The device of claim 3, wherein a longitudinal light source mounting hole is formed in the middle of the light source base, a vertical jackscrew mounting hole communicated with the light source mounting hole is formed in the upper portion of the light source base, the light source penetrates through the longitudinal light source mounting hole, and a jackscrew is mounted at the jackscrew mounting hole.
5. The device of claim 2, wherein the collimating lens holder is of an L-shaped structure and comprises an integrally formed horizontal holder and a vertical holder, the horizontal holder is fixedly mounted on the base, the middle of the collimating lens is rotatably mounted on the vertical holder through a rotating shaft, the collimating lens is provided with a circle of screw countersunk holes at the periphery of the rotating shaft, the collimating lens and the vertical holder are connected through countersunk bolts at the screw countersunk holes, and the diameter of the countersunk bolts is smaller than the diameter of the screw countersunk holes.
6. The device of claim 2, wherein the number of the laser supports is two, the top of the laser support is provided with an arc-shaped laser abdication position, an elastic gasket is installed at the laser abdication position, an elastic pressing sheet is arranged above the laser, and two ends of the elastic pressing sheet are fixedly connected with the laser support through bolts.
7. The apparatus of claim 2, further comprising an interferometer module and a convergence module fixedly mounted on the base.
8. The device of claim 2, wherein the light source support is fixedly provided with a light source cover, the light source cover is provided with a light transmission hole at the side part and a jackscrew mounting hole at the top, and a diaphragm is fixedly arranged in the light source cover.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812812A (en) * | 2022-06-28 | 2022-07-29 | 南京霍普斯科技有限公司 | Optical path collimation adjusting and fixing mechanism of spectrum analyzer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812812A (en) * | 2022-06-28 | 2022-07-29 | 南京霍普斯科技有限公司 | Optical path collimation adjusting and fixing mechanism of spectrum analyzer |
| CN114812812B (en) * | 2022-06-28 | 2022-09-09 | 南京霍普斯科技有限公司 | Light path collimation adjusting and fixing mechanism of spectrum analyzer |
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