CN104515596B - Miniature rotary scanning Fourier transform spectrometer, - Google Patents
Miniature rotary scanning Fourier transform spectrometer, Download PDFInfo
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- CN104515596B CN104515596B CN201310444659.1A CN201310444659A CN104515596B CN 104515596 B CN104515596 B CN 104515596B CN 201310444659 A CN201310444659 A CN 201310444659A CN 104515596 B CN104515596 B CN 104515596B
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- optical path
- tumbler
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Abstract
This is a kind of rotary scanning formula Fourier transform spectrometer, and tumbler is located at an arm of light path, and optical path compensation device is located at another arm of light path, is not required to provide additional space expense for tumbler, can make spectrometer volume-diminished to the size of half of palm.In addition, spectrometer can realize that very trickle optical path difference changes by the change of the anglec of rotation, by the setting of the parameters such as the maximum anglec of rotation, tumbler refractive index optical path difference can be realized from nanometer scale to the change of millimeter or centimetres.This spectrometer maximum feature is small volume, and in light weight, scanning range is wide, and practicality is high, is a kind of portable spectrometer that can realize real-time online measuring.
Description
Technical field
The present invention is a kind of Fourier transform spectrometer, realizes that optical path difference changes in a manner of rotary scanning, belongs to spectrum point
Analyzer device, relate generally to spectroscopic instrumentation designs field.
Background technology
Fourier transform spectrometer, is the powerful of spectrum analysis, has some at present and realizes light by rotary scanning
The technology that path difference changes, such as a kind of method mentioned in patent CN2108288, its index path such as Fig. 1.This method is to rotate
Device is changed as the intersection of Liang Ge light paths branch by the light path of the rotation Shi Liangge light paths branch of tumbler
Become, be characterized in simple in construction, optical path difference scope is larger, is worked suitable for various spectral regions.But because its tumbler is located at
Two intersections of light path branch are, it is necessary to extra space-consuming, and optics used is more, it is understood that there may be some potential unstable
Factor.Rotating device as in a light path branch, light path is compensated in another light path branch by the present invention with compensation device, can
To be substantially reduced spectrometer volume, the volume for making this instrument is the half of above-mentioned spectrometer volume.
The content of the invention
The main index path of the present invention is as shown in Figure 2.Wherein element 1 is diaphragm, and main function is control input light beam
Size, it can be set according to being actually needed.Element 2 is lens, and main function is that light beam is changed into directional light.Element 3 is point
Beam device, incident beam can be divided into two by it.The tumbler of element 4, opticator are square optical material, if carrying out infrared
Wave band measures, then its material is chosen as zinc selenide.It is driven by servomotor, and optical path difference is produced by rotating.Element 5 and 7
For plane mirror, if incident beam with beam splitter into 45 degree of angles, plane mirror is also into 45 degree of angles, then incides reflection
Light beam on mirror is by backtracking.Element 6 is optical path compensation device, when the anglec of rotation of tumbler is zero, the light of upper branch road
Optical path difference still can be produced perpendicular through tumbler, so placing compensation device in the direction of lower branch road and beam orthogonal to support
Optical path difference when racemization corner is zero.Element 8 is convergent mirror, can converge to light beam a bit.Element 9 is optical detector, is connect
Receive optical information.Comparing Fig. 1 and Fig. 2 can find that the volume of this instrument is only the half of equipment instrument shown in Fig. 1.
Change of the optical path difference with the anglec of rotation is calculated below：
When the anglec of rotation is 0 degree, each parameter setting is as shown in Figure 3.The optical path difference of lower branch road can be obtained directly, and turn
Lower branch road optical path difference is constant in dynamic device rotation process.So the groundwork that optical path difference calculates concentrates on branch road.Using O as original
Point establishes coordinate system along horizontally and vertically direction, and the light path of each section of light path is calculated with the method for analytic geometry.
When the anglec of rotation is θ, as shown in Figure 4.If straight line where rotary body both sides is l1And l2, its equation can be write out：
Wherein d is the thickness of tumbler.
The equation of straight line is y=x where incident ray, if itself and l1Mutually give point S1(x1, y1)
Equations simultaneousness solves：
y1=x1
Light path when light is inside tumbler calculates as shown in Figure 5.Straight where the light inside tumbler
Line equation is set to l3, the angle of itself and normal is set to α, and the refractive index of tumbler is set to n, then can obtain α by the law of refraction
Numerical value.
l3Equation can be written as：
l3：y=tan(45-θ+α)x+y1-tan(45-θ+α)x1
If l3With l2Intersect at point S2(x2, y2), equations simultaneousness solves：
y2=tan(45-θ+α)x2+y1-tan(45-θ+α)x1
If equation where emergent ray is l from tumbler4, equation where plane mirror is l5If l4With l5It is intersecting
In point S3(x3, y3)
l4：y=x+y2-x2
l5：y=-x+40
Equations simultaneousness obtains：
y3=-x3+40
Institute's above branch road light path is：
L1=|OS1|+|S1S2|+|S2S3|
Wherein | OS1|, | S1S2|, | S2S3| it is respectively OS1, S2S2, S2S3Light path.
Lower branch road light path is：
The total optical path difference of branch road is up and down：
Δ=2(L1-L2)
Brief description of the drawings
Fig. 1 is the schematic diagram of existing patent (CN2108288).Fig. 2 is that the rotation sweep Fourier designed by the present invention becomes
Change the index path of spectrum.Fig. 3, Fig. 4 and Fig. 5 are to calculate the auxiliary optical path figure used during optical path difference.Fig. 6 is to be used for infrared band
A kind of rotation sweep Fourier transform spectrometer, design example.
Embodiment
Exemplified by measuring infrared band, specific Instrument Design figure is as shown in Figure 6.The parameter of each element such as table 1.
Table 1
| Optical element | Attribute |
| Diaphragm FS | Slit width 4mm |
| Beam splitter BS | Long 20mm, 3mm every thick, common two panels |
| Lens | Focal length f=20mm, diameter are more than 8mm |
| Tumbler (zinc selenide) | Thickness d=5mm, the maximum anglec of rotation 40 degree (angles) |
| Compensation device (zinc selenide) | Thickness d=5mm |
| Level crossing | Diameter 20mm |
It is origin with 0, then each point coordinates is as follows if A, B, C, E, F, G, H, I are the central point of each component：
A(18,55) B(23,50)
C(35,37) E(23,24)
F(45,50) G(55,60)
H(45,24) I(55,14)
Under above-mentioned parameter setting, when zinc selenide refractive rate takes 2.5 maximum optical path difference can be calculated is：
Δ=1.499075mm
Now its resolution ratio is about 3.3cm-1, want to improve resolution ratio, dress can be rotated by increasing the anglec of rotation or increase
The mode of thickness is put to increase maximum optical path difference, the maximum anglec of rotation and rotating device thickness etc. can be determined according to the actual requirements
Parameter.
In terms of stability, either tumbler or compensation device, it is perpendicular to normal and parallel to normal
Drift occurs on direction all without the change for influenceing optical path difference, only it, which is rotated, can just change optical path difference, and this causes its tool
There is good stability.
Claims (2)
- A kind of 1. miniature rotary scanning Fourier transform spectrometer, mainly by diaphragm, collimating mirror, beam splitter, tumbler, plane Speculum, optical path compensation device, convergent mirror and optical detector composition, are changed to produce by the anglec of rotation of tumbler [4] Optical path difference, tumbler are located in a branch of light path, driven by servomotor, and the minor alteration of the anglec of rotation can produce very Fine optical path difference changes, and rotational angle is close linear with optical path difference, and optical path compensation device [6] is located at another point of light path Zhi Zhong, it act as compensation tumbler caused optical path difference when the anglec of rotation is zero, the optical material of compensation device Identical with the optical material of tumbler, position is fixed, it is not necessary to which motor drives.
- 2. according to the Fourier transform spectrometer, described in claim 1, its optical path difference can be realized by nanometer scale to millimeter Or the change of centimetres, such as infrared band, in the maximum anglec of rotation, optical path difference can reach millimeter magnitude, every 0.1 degree Optical path difference caused by the change of the anglec of rotation changes into micron dimension.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310444659.1A CN104515596B (en) | 2013-09-26 | 2013-09-26 | Miniature rotary scanning Fourier transform spectrometer, |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310444659.1A CN104515596B (en) | 2013-09-26 | 2013-09-26 | Miniature rotary scanning Fourier transform spectrometer, |
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| CN104515596A CN104515596A (en) | 2015-04-15 |
| CN104515596B true CN104515596B (en) | 2018-03-30 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109991731A (en) * | 2019-04-11 | 2019-07-09 | 中国科学院长春光学精密机械与物理研究所 | A kind of light path changes device and optical interference system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684255A (en) * | 1984-08-09 | 1987-08-04 | The Perkin-Elmer Corporation | Interferometric optical path difference scanners and FT spectrophotometers incorporating them |
| US5883713A (en) * | 1997-09-16 | 1999-03-16 | Boeing North American, Inc. | Ultra fast fourier transform spectrometer with rotating scanning cube |
| US6222632B1 (en) * | 1999-04-07 | 2001-04-24 | Luxtron Corporation | Polarization interferometer spectrometer with rotatable birefringent element |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2046623U (en) * | 1989-01-14 | 1989-10-25 | 北京大学 | Integrated optical interferometer |
| US7499175B1 (en) * | 2006-05-18 | 2009-03-03 | Lockheed Martin Corporation | Enhanced Michelson interferometric optical filter with broadened wavelength blockage |
| US8717573B1 (en) * | 2010-03-05 | 2014-05-06 | Lockheed Martin Corporation | Tunable interferometric scanning spectrometer |
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- 2013-09-26 CN CN201310444659.1A patent/CN104515596B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684255A (en) * | 1984-08-09 | 1987-08-04 | The Perkin-Elmer Corporation | Interferometric optical path difference scanners and FT spectrophotometers incorporating them |
| US5883713A (en) * | 1997-09-16 | 1999-03-16 | Boeing North American, Inc. | Ultra fast fourier transform spectrometer with rotating scanning cube |
| US6222632B1 (en) * | 1999-04-07 | 2001-04-24 | Luxtron Corporation | Polarization interferometer spectrometer with rotatable birefringent element |
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