CN106092914B - A kind of spectroanalysis instrument and combinations thereof light source - Google Patents
A kind of spectroanalysis instrument and combinations thereof light source Download PDFInfo
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- CN106092914B CN106092914B CN201610367924.4A CN201610367924A CN106092914B CN 106092914 B CN106092914 B CN 106092914B CN 201610367924 A CN201610367924 A CN 201610367924A CN 106092914 B CN106092914 B CN 106092914B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
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Abstract
The present invention provides a kind of spectroanalysis instrument and combinations thereof light source, combined light source includes first light source, second light source, off-axis parabolic mirror and fused silica lens and other lenses, off-axis parabolic mirror includes paraboloidal top surface, rounded bottom surface, and the cylindrical surface of connection top and bottom, top surface is reflecting surface；Itself has a plane of symmetry, and the center of reflecting surface is provided with the second light hole, the first light hole is provided on bottom surface or cylindrical surface, constitutes tapered light channels between the first light hole and the second light hole.I.e. off-axis parabolic mirror has the function of light transmission function and reflected light simultaneously, so that two light beams that first light source and second light source emit are merged into a broad-spectrum beam.Since combined light source provided by the invention only includes first light source, second light source, off-axis parabolic mirror and attachment lens, the structure of combined light source is simple, without the mechanical structure of movement, and then can reduce the volume of combined light source.
Description
Technical field
The present invention relates to light source field more particularly to a kind of spectroanalysis instrument and combinations thereof light sources.
Background technique
In biological detection and constituent analysis, can often it use from ultraviolet light to visible light or even from ultraviolet light to infrared light
Wide spectrum detection light source.Broad spectrum light source used in traditional large-scale spectrophotometer is usually the group of deuterium lamp and tungsten lamp
Light combination source is to toggle to realize wide spectrum between deuterium lamp light source and tungsten light source using mechanical structure in the prior art.By
In needing to change lamp in the wavelength starting mechanical device set, cause that broad spectrum light source cannot be provided all the period of time, and changing lamp
Measured value near wavelength can generate mistake, and realize that the mechanical structure for changing lamp is complex, and the volume of combined light source is larger.
Summary of the invention
In view of this, the present invention provides a kind of spectroanalysis instrument and combinations thereof light source, to solve deuterium tungsten group in the prior art
The problem that light combination source structure is complicated and volume is larger.
To achieve the above object, the invention provides the following technical scheme:
A kind of combined light source, comprising: first light source, at least one lens, off-axis parabolic mirror, is melted second light source
Quartz lens；
The off-axis parabolic mirror includes top surface, bottom surface, and connects the cylindrical surface of the top surface and the bottom surface,
Wherein, the bottom surface is circle, and the top surface is the reflecting surface of paraboloidal；
The off-axis parabolic mirror has the plane of symmetry, and the center of the reflecting surface is provided with the second light hole, institute
It states and is provided with the first light hole on bottom surface or the cylindrical surface, constitute taper between first light hole and second light hole
The optical axis of optical channel, the tapered light channels is located in the plane of symmetry of the off-axis parabolic mirror, and with the bottom surface or
The cylindrical surface is vertical, wherein the aperture of first light hole is greater than the aperture of second light hole；
First light hole described in the first light source face；
For at least one described lens between the first light source and the off-axis parabolic mirror, being used for will be described
The light convergence that first light source issues is imaged on the center of the reflecting surface of the off-axis parabolic mirror；
The second light source is located at the reflection surface side of the off-axis parabolic mirror, and the light that the second light source issues
After the reflective surface, it is formed in parallel with the directional light of the tapered light channels optical axis；
The fused silica lens are located at the reflection surface side of the off-axis parabolic mirror, and the light of the fused silica lens
Axis is Chong Die with the optical axis of at least one lens.
Preferably, the first light source is tungsten lamp, and the second light source is deuterium lamp.
It preferably, further include optical filter between the second light source and the off-axis parabolic mirror.
Preferably, the first light source is deuterium lamp, and the second light source is tungsten lamp.
At least one lens being preferably located between the first light source and the off-axis parabolic mirror are one
Convex lens.
At least one lens being preferably located between the first light source and the off-axis parabolic mirror are two
Lens, the optical axis overlapping of described two lens.
Preferably, the fused silica lens are achromatism fused silica lens.
Preferably, first light hole is located on the cylindrical surface, the optical axis of the tapered light channels and the cylinder
The axis of a cylinder in face is vertical.
Preferably, first light hole is located at the center of circle of the bottom surface.
The present invention also provides a kind of spectroanalysis instrument, including light source, the light source is combined light source recited above.
It can be seen via above technical scheme that in spectroanalysis instrument provided by the invention and combinations thereof light source, the combination
Light source includes first light source, second light source, off-axis parabolic mirror and fused silica lens and other lenses, the off-axis parabolic
Face reflecting mirror includes top surface, bottom surface, and the cylindrical surface of the connection top surface and the bottom surface, wherein and the bottom surface is circle,
The top surface is the reflecting surface of paraboloidal；The off-axis parabolic mirror has the plane of symmetry, the centre bit of the reflecting surface
It sets and is provided with the second light hole, be provided with the first light hole on the bottom surface or the cylindrical surface, first light hole and described the
Tapered light channels are constituted between two light holes, the optical axis of the tapered light channels is located at the symmetrical of the off-axis parabolic mirror
In face, and it is vertical with the bottom surface or the cylindrical surface, wherein the aperture of first light hole is greater than second light hole
Aperture.The i.e. described off-axis parabolic mirror has the function of light transmission function and reflected light simultaneously, thus as bundling device by
One light source and two light beams of second light source transmitting merge into a broad-spectrum beam.Only due to combined light source provided by the invention
Including first light source, second light source, off-axis parabolic mirror and attachment lens, therefore, the structure letter of the combined light source
It is single, without the mechanical structure of movement, and then the volume of combined light source can be reduced.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of combined light source schematic diagram provided by the invention；
Fig. 2 is the off-axis parabolic mirror that reflecting surface center provided by the invention offers light hole；
Fig. 3 is the position view of second light source and off-axis parabolic mirror in combined light source provided by the invention；
Fig. 4 is another combined light source schematic diagram provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Inventor has found that there are also a kind of miniaturization lightweight wide spectrum combined light sources in the prior art during invention, i.e.,
Back transmission deuterium lamp light source, including deuterium lamp and tungsten lamp, wherein deuterium lamp opens up the through-hole of light transmission by special designing on deuterium lamp, will
Tungsten lamp is placed in behind deuterium lamp, and while deuterium lamp emitting ultraviolet light, tungsten lamp emits visible light by the light transmission through-hole on deuterium lamp,
To obtain the conjunction beam of two light beams, wide spectrum is realized.Since two light sources being set together, and without between two lamps
Lamp is changed by mechanical structure, to realize the miniaturization and lightweight of combined light source.But since the deuterium lamp is set by special
Meter, causes expensive, higher cost.
Based on this, a kind of structure provided by the invention is simple, small in size and lower-cost combined light source, as shown in Figure 1,
Including first light source 4, second light source 2, at least one lens, off-axis parabolic mirror 1, fused silica lens 6.
It should be noted that the combined light source provided in the present embodiment is mainly used for realizing wide spectrum, the wide spectrum can
To be ultraviolet light to the spectrum between visible light, it is also possible to ultraviolet light to the spectrum between infrared light, therefore, in the present embodiment
The first light source and second light source are not limited.Preferably, the combined light source is that can obtain ultraviolet light between visible light
Wide spectrum deuterium tungsten combined light source, i.e., the described first light source be tungsten lamp, the second light source be deuterium lamp；Or the first light source
For deuterium lamp, the second light source is tungsten lamp.
As shown in Fig. 2, for off-axis parabolic mirror 1 described in the present embodiment, including top surface, bottom surface 12, and connection
The cylindrical surface 11 of top and bottom 12, wherein bottom surface 12 is circle, and top surface is the reflecting surface 7 of paraboloidal, in reflecting surface 7
Heart position is provided with the second light hole 8.
The first light hole is offered in the present embodiment on the bottom surface or cylindrical surface of off-axis parabolic mirror, described first is logical
Tapered light channels are constituted between unthreaded hole and second light hole, the optical axis of the tapered light channels is located at the off axis paraboloid mirror
In the plane of symmetry of reflecting mirror, and it is vertical with the bottom surface or the cylindrical surface, wherein the aperture of first light hole is greater than institute
State the aperture of the second light hole.
The off-axis parabolic mirror provided in the present embodiment is that one piece of surface is coated with reflectance coating, and center has light hole
Off-axis parabolic mirror.Wherein, the reflectance coating is designed according to the light that second light source emits, when second light source transmitting can
When light-exposed, the reflectance coating is visible light reflecting film, i.e., has the reflectance coating of high reflectance to visible light, visible for reflecting
Light.When the second light source emitting ultraviolet light, the reflectance coating is ultraviolet optical reflection film, i.e., has ultraviolet light compared with high reflection
The reflectance coating of rate, for reflecting ultraviolet light.
It should be noted that the plane of symmetry of off-axis parabolic mirror 1 is the plane cut as shown in Figure 2 along A-A.
At this point, the optical axis of the tapered light channels is located in the plane of symmetry of the off-axis parabolic mirror, and with the bottom surface or institute
It is vertical to state cylindrical surface.If when the optical axis and plane perpendicular of the tapered light channels, first light hole is located at the bottom surface
The center of circle.If the optical axis of the tapered light channels is vertical with cylindrical surface, the first light hole is located on cylindrical surface, as shown in figure 1
Shown in one light hole 9.It is not limited this in the present embodiment, selection can be carried out according to actual conditions and opens up first light passing
The position in hole.
Second light hole 8 with the first light hole 9 on cylindrical surface 11 at 7 center of reflecting surface play diaphragm work in the present embodiment
With, by first light source emit light be filtered.Aperture diaphragm size can be modified according to actual needs, in the present embodiment
Without limitation to the sizes of described two aperture diaphragms.
First light source 4 is located at the cylinder surface side of off-axis parabolic mirror 1, and on face off-axis parabolic mirror 1
First light hole 9 of tapered light channels.That is the optical axis of light launched of first light source 4 is parallel with tapered light channels, first light source 4
The light of transmitting can directly pass through the tapered light channels.
It further include at least one lens in the present embodiment, at least one described lens are located at first light source 4 and off-axis parabolic
Between face reflecting mirror 1, the light convergence for issuing first light source 4 is imaged on the reflecting surface center of off-axis parabolic mirror 1.
It should be noted that in the present embodiment unlimited fix-focus lens number, can be the group of a lens or multiple lens
It closes, as long as it, which can be realized, is imaged on the reflecting surface center of off-axis parabolic mirror 1 i.e. for the light convergence that first light source 4 issues
It can.The miniaturization of combined light source is considered in the present embodiment, can preferably be issued first light source 4 using a convex lens realization
Light convergence be imaged on the reflecting surface center of off-axis parabolic mirror 1, lens 5 as shown in figure 1.In other implementations of the invention
In example, at least one lens between the first light source and the off-axis parabolic mirror be can also be including two
The lens combination of lens, the optical axis overlapping of described two lens.It may include convex lens in the lens combination, can also include
Concavees lens, but as long as the light convergence that first light source 4 issues can be imaged on the reflection of off-axis parabolic mirror 1 by lens combination
Face center.
Second light source 2 is located at the reflection surface side of off-axis parabolic mirror 1, and the light that second light source 2 issues is by off-axis
After the reflecting surface 7 of parabolic mirror 1 reflects, it is formed in parallel with the directional light of the tapered light channels optical axis.Such as institute in Fig. 3
Show, it is -135 ° that second light source 2, which issues the optical axis of light and the normal angle θ of the reflecting surface 7 of off-axis parabolic mirror 1, works as θ
At=- 135 °, and second light source 2 is located at the reflector focus position of the reflecting surface of off-axis parabolic mirror 1, so that second
The light that light source 2 issues is formed in parallel with the tapered light channels optical axis after the reflective surface of off-axis parabolic mirror 1
Parallel light emergence.
If the first light hole is located at the bottom surface center of circle of off-axis parabolic mirror, second light source is located at the off-axis parabolic
The reflection surface side of face reflecting mirror, and the light that the second light source issues is formed in parallel with described after the reflective surface
The directional light of tapered light channels optical axis, i.e., another reflection that the described second light source is located at the off-axis parabolic mirror are burnt
At point.The position of first light source and second light source is correspondingly arranged according to the direction of taper light-path in the present embodiment, the present embodiment
In this is not described in detail.
After being imaged on the reflecting surface center of off-axis parabolic mirror 1 due to the light convergence of first light source outgoing, it is equivalent to
The real image of first light source issues light at the reflecting surface center of off-axis parabolic mirror 1, and the light emitted at this time is diverging light, and light
The light that source generates will finally be coupled in optical fiber, then be analyzed with spectroanalysis instrument.Therefore, as shown in Figure 1, in the present embodiment
It further include fused silica lens 6 in the reflection surface side of the off-axis parabolic mirror, and its optical axis is Chong Die with the optical axis of lens 5,
To which the light of first light source transmitting is realized convergence, while the light of the second light source after reflection also being converged.This reality
It applies in example, fused silica lens are less to the absorption of ultraviolet light, can guarantee the transmitance of ultraviolet light, therefore be suitable for deuterium tungsten and combine
Light source.In the wide spectrum instrument of ultraviolet light to infrared light, the fused silica lens also can be set, ultraviolet light is avoided to be inhaled
It receives.
It should be noted that by the concept of chromatism of position in geometric optics and the focal length formula of thin lens, same thin is saturating
Mirror has different focal lengths to different coloured light:
N (λ)=A+B/ λ2+C/λ4--- formula 2
Wherein, f' be thin lens focal length, n (λ) be different wave length light wave under thin lens refractive index, wherein A, B, C be with
The relevant constant of the material of thin lens, ρ 1, ρ 2 are the curvature of two curved surfaces of thin lens.By formula 1,2 above it is found that wavelength is got over
Short refractive index is higher, and the light focus of short wavelength, away from wanting short, will cause the position color of two light away from the light focus relative to long wavelength in this way
Difference.The spectrum of deuterium lamp is in 200nm-400nm or so, and the spectrum of tungsten lamp is in 300nm-800nm or so, with regard to deuterium tungsten combined light source
From the point of view of, deuterium lamp using wavelength than tungsten lamp using wavelength it is short, so for deuterium lamp light beam convergence effect than tungsten lamp light beam
Convergence effect will be got well.In addition, the energy of light can decrease, and the light energy of tungsten lamp is high after the iris action for passing through light hole
In the light energy of deuterium lamp, for the light energy for guaranteeing deuterium lamp, preferred in the present embodiment, the first light source is tungsten lamp, described the
Two light sources are deuterium lamp.At this point, the reflectance coating plated on the reflecting surface of the off-axis parabolic mirror is ultraviolet optical reflection film.
As shown in figure 4, when second light source is deuterium lamp, between the second light source and the off-axis parabolic mirror also
Including optical filter 3, optical filter 3 is low pass filter, can wavelength certain in the deuterium lamp spectrum launched by second light source 2 with
On spectrum filter, making spectrum smoothly does not influence the detection of subsequent probe device or analyzer.
In the present embodiment, it is preferred that fused silica lens 6 are achromatism fused silica lens, can eliminate first light source sending
Light and second light source issue light between existing color difference, so that the light of first light source and second light source be converged to a bit
On, it is in turn coupled in optical fiber 10, so as to subsequent use.
Specific use process is as follows for deuterium tungsten combined light source provided in this embodiment:
(1) off-axis parabolic mirror is fixed, the position of reflector focus is measured；
(2) position of deuterium lamp is adjusted, so that deuterium lamp is located at direction and the reflecting surface method of the light at reflector focus and issued
To -135 ° of angle, pass through reflecting surface center；
(3) tungsten lamp and lens are placed in the side of the light hole of the side of off-axis parabolic mirror, adjustment tungsten lamp and thoroughly
The position of mirror allows to the picture at the light hole of reflecting surface at tungsten lamp, the position of fixed tungsten lamp and lens；
(4) in the reflection surface side of off-axis parabolic mirror, fixed achromatism fused silica lens, by the light of deuterium lamp transmitting and
Tungsten lamp transmitting optically coupling to optical fiber output.
The combined light source provided in the present embodiment, including first light source, second light source, off-axis parabolic mirror and melt stone
English lens and other lenses, the off-axis parabolic mirror includes top surface, bottom surface, and connects the top surface and the bottom surface
Cylindrical surface, wherein the bottom surface be circle, the top surface be paraboloidal reflecting surface；The off-axis parabolic mirror
With the plane of symmetry, the center of the reflecting surface is provided with the second light hole, is provided with first on the bottom surface or the cylindrical surface
Light hole constitutes tapered light channels, the optical axis of the tapered light channels between first light hole and second light hole
In the plane of symmetry of the off-axis parabolic mirror, and it is vertical with the bottom surface or the cylindrical surface, wherein described first
The aperture of light hole is greater than the aperture of second light hole.
The i.e. described off-axis parabolic mirror has the function of light transmission function and reflected light simultaneously, thus as bundling device by
One light source and two light beams of second light source transmitting merge into a broad-spectrum beam.Only due to combined light source provided by the invention
Including first light source, second light source, off-axis parabolic mirror and attachment lens, therefore, the structure letter of the combined light source
It is single, without the mechanical structure of movement, and then the volume of combined light source can be reduced, reduce structure size, be convenient for and miniature light
Spectrum, the biological detection system of the compositions such as spectrometer miniaturization.
Relative to back transmission deuterium lamp light source, it is common deuterium lamp by deuterium lamp in this present embodiment, therefore, there is no need to using multiple
General labourer's skill makes deuterium lamp, to not increase the cost of deuterium lamp while realizing miniaturization, so that miniaturization deuterium tungsten combined light source
Suitable for commodity production.
In addition, there are also a kind of deuterium tungsten combined light sources in the prior art, use beam-splitter as bundling device, by deuterium lamp and tungsten lamp
Combiner, the beam-splitter transmits a part of light, a part of light reflected, to two-beam is combined into a branch of.
It should be noted that combined light source provided in this embodiment, anti-using the intermediate off axis paraboloid mirror with light hole
Penetrate mirror as bundling device, since light hole is all to pass through to the light for entering light hole, without energy loss, therefore, relatively
In beam-splitter as bundling device, the combined light source of the present embodiment offer can guarantee certain light energy.Moreover, this implementation
The reflecting surface for the off-axis parabolic mirror that example provides has certain curvature, can play the role of certain convergence to reflected light,
Further reduce the loss of light energy.
Therefore, combined light source structure provided in this embodiment is simple, at low cost, and can reduce the loss of light energy.
The present invention also provides a kind of spectroanalysis instrument, the spectroanalysis instrument includes combined light source recited above, due to
The combined light source structure is simple, at low cost, so as to so that the spectroanalysis instrument miniaturized structure, while ensure that into
This does not increase, moreover it is possible to guarantee the light energy of light source.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of combined light source characterized by comprising first light source, second light source, at least one lens, off axis paraboloid mirror
Reflecting mirror, fused silica lens；
The off-axis parabolic mirror includes top surface, bottom surface, and connects the cylindrical surface of the top surface and the bottom surface,
In, the bottom surface is circle, and the top surface is the reflecting surface of paraboloidal；
The off-axis parabolic mirror has the plane of symmetry, and the center of the reflecting surface is provided with the second light hole, the bottom
It is provided with the first light hole on face or the cylindrical surface, it is logical that cone of light is constituted between first light hole and second light hole
The optical axis in road, the tapered light channels is located in the plane of symmetry of the off-axis parabolic mirror, and with the bottom surface or described
Cylindrical surface is vertical, wherein the aperture of first light hole is greater than the aperture of second light hole；
First light hole described in the first light source face；
At least one described lens are used between the first light source and the off-axis parabolic mirror by described first
The light convergence that light source issues is imaged on the center of the reflecting surface of the off-axis parabolic mirror；
The second light source is located at the reflection surface side of the off-axis parabolic mirror, and the light that the second light source issues passes through
After the reflective surface, it is formed in parallel with the directional light of the tapered light channels optical axis；
The fused silica lens are located at the reflection surface side of the off-axis parabolic mirror, and the optical axis of the fused silica lens with
The optical axis of at least one lens is overlapped；
Wherein, the first light source is deuterium lamp, and the second light source is tungsten lamp.
2. the combined light source according to claim 1, which is characterized in that the first light source is tungsten lamp, the second light source
For deuterium lamp.
3. combined light source according to claim 2, which is characterized in that the second light source and the off axis paraboloid mirror reflect
It further include optical filter between mirror.
4. combined light source according to claim 1, which is characterized in that be located at the first light source and the off axis paraboloid mirror
At least one lens between reflecting mirror are a convex lens.
5. combined light source according to claim 1, which is characterized in that be located at the first light source and the off axis paraboloid mirror
At least one lens between reflecting mirror are two lens, and the optical axis of described two lens is overlapped.
6. combined light source according to claim 1, which is characterized in that the fused silica lens are that achromatism fused silica is saturating
Mirror.
7. combined light source according to claim 1, which is characterized in that first light hole is located on the cylindrical surface,
The optical axis of the tapered light channels is vertical with the axis of a cylinder on the cylindrical surface.
8. combined light source according to claim 1, which is characterized in that first light hole is located at the circle of the bottom surface
The heart.
9. a kind of spectroanalysis instrument, which is characterized in that including light source, the light source is described in claim 1-8 any one
Combined light source.
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| CN201610367924.4A CN106092914B (en) | 2016-05-30 | 2016-05-30 | A kind of spectroanalysis instrument and combinations thereof light source |
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| CN106092914A (en) | 2016-11-09 |
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