CN109557044A - A kind of cavity ring-down spectroscopy beam path alignment system and method - Google Patents
A kind of cavity ring-down spectroscopy beam path alignment system and method Download PDFInfo
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- CN109557044A CN109557044A CN201811488495.1A CN201811488495A CN109557044A CN 109557044 A CN109557044 A CN 109557044A CN 201811488495 A CN201811488495 A CN 201811488495A CN 109557044 A CN109557044 A CN 109557044A
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- beam path
- down spectroscopy
- cavity ring
- alignment system
- light
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/391—Intracavity sample
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- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a kind of cavity ring-down spectroscopy beam path alignment system and methods, system includes: CCD camera, PD detector, reflecting mirror, diaphragm and pin hole block, and method is the following steps are included: step 1: placing the pin hole block and using blank sheet of paper in order at two curved reflector positions for forming the optical resonator with the determination reflecting mirror optimum position；Step 2: the corresponding pin hole block is removed when the reflecting mirror is in optimum position, places two curved reflectors for forming the optical resonator in order so that the light that two curved reflectors return passes through the diaphragm center；Step 3: change the position of two curved reflectors of the optical resonator, using the CCD camera observation optical path light intensity whether be setting maximum value, meet after the maximum value of setting that then beam path alignment adjusting finishes.Compared with prior art, the present invention has easy to operate, low in cost, it is easy to accomplish the advantages that.
Description
Technical field
The present invention relates to cavity ring-down spectroscopy beam path alignment technical fields, more particularly, to a kind of cavity ring-down spectroscopy beam path alignment
System and method.
Background technique
Cavity ring-down spectroscopy (Cavity ring-down spectroscopy, CRDS) is a kind of very sensitive spectrum
Method.It can be used to detect the absolute optical extinction of sample, scattering and absorption including light.It has been widely used
In detection gaseous sample in the absorption of specific wavelength, and the molar fraction of sample can be determined in the level of ppt.This
Kind method is also referred to as laser optical cavity dying oscillation absorption spectrum (Cavity ring-down laser absorption
Spectroscopy, CRLAS).
One typical cavity ring-down spectroscopy device contains one for illuminating the laser of high-fineness optical resonator
Light source, and constitute the two sides high reflectivity mirror of resonant cavity.When the mode resonance of laser resonant cavity, intracavitary light intensity can be because
Constructive interference enhances rapidly.Laser is cut off rapidly later, to detect the exponential damping of the escape intensity from chamber.In decaying,
Light, by roundtrip thousands of times, thus brings effective absorption light path of a few to tens of kilometers between reflecting mirror.
If extinction material is placed in resonant cavity, the average life span of intracavitary photon can be reduced because being absorbed.One
The measurement of light intensity ring-down spectroscopy device is covered, light intensity attenuation time required for the 1/e of intensity, this time for before are referred to as
" ring-down time " can be used to calculate the concentration of intracavitary extinction material.
Due to there is the two sides high reflectivity mirror for constituting resonant cavity in cavity ring-down spectroscopy, when reflecting mirror does not collimate
When, detector will be unable to detect optical signalling.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of cavity ring-down spectroscopy light
Road colimated light system and method.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of cavity ring-down spectroscopy beam path alignment system, comprising:
CCD camera, for judging whether optical path collimates；
PD detector, for detecting cavity-type BPM signal；
Reflecting mirror is optically coupled into optical resonator for emit laser；
Diaphragm, for judging the position of optical resonator；
Pin hole block is used for collimating optics resonant cavity.
Further, the optical resonator is made of two curved reflectors.
Further, the curved reflector is the curved reflector that reflectivity is 99.98.
Further, the reflecting mirror is plane mirror.
Further, the structure of the pin hole block is cylindrical structure, and one end of the cylindrical structure is equipped with concave surface.
Further, the center position of the concave surface is additionally provided with groove.
Further, the structure of the groove is conical structure, and the top of the conical structure is equipped with circular hole.
A kind of cavity ring-down spectroscopy light path collimation method using the cavity ring-down spectroscopy beam path alignment system, including it is following
Step:
Step 1: placing the pin hole block in order at two curved reflector positions for forming the optical resonator
And using blank sheet of paper with the determination reflecting mirror optimum position；
Step 2: the corresponding pin hole block is removed when the reflecting mirror is in optimum position, places composition institute in order
Two curved reflectors of optical resonator are stated so that the light that two curved reflectors return passes through the diaphragm center
Position；
Step 3: changing the position of two curved reflectors of the optical resonator, judged using the CCD camera
The light intensity of optical path whether be setting maximum value, meet after the maximum value of setting that then beam path alignment adjusting finishes.
Further, the maximum value is the 95% of the light intensity of the light of laser transmitting.
Compared with prior art, the invention has the following advantages that
(1) CCD camera easy to operate, that the present invention uses, for judging whether optical path collimates；PD detector, is used for
Detect cavity-type BPM signal；Reflecting mirror is optically coupled into optical resonator for emit laser；Diaphragm, for judging
The position of optical resonator；Pin hole block, the technical solution for collimating optics resonant cavity, it is only necessary to adjust the position of all parts simultaneously
Interchanging method in order according to the invention can complete the operation of cavity ring-down spectroscopy beam path alignment, and integrated operation is easy, be easy to real
It is existing.
(2) low in cost, pin hole block of the present invention, structure is simple, low in cost, and remaining equipment is such as
CCD camera, curved surface or plane mirror and PD detector are easy to obtain, and price is not also high, so that entire system of the invention
Overall cost of uniting is cheap, it is easy to accomplish.
Detailed description of the invention
Fig. 1 is the overall structure diagram of system of the invention；
Fig. 2 is the structural schematic diagram of pin hole block of the invention；
Drawing reference numeral explanation:
1 is CCD camera；2 be PD detector；3 be plane mirror；4 be diaphragm；5 be pin hole block；6 be camber reflection
Mirror.
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 embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work
Example is applied, all should belong to the scope of protection of the invention.
Embodiment
Set: the plane mirror of the close laser in Fig. 1 is symmetrically plane reflection with plane mirror R1 as R1
Mirror R2, diaphragm are named as Iris, two curved reflectors M1 and M2 of setting composition optical resonator, and setting pair from left to right
The pin hole block answered is P1 and P2.
It is as depicted in figs. 1 and 2 a kind of 5 knot of overall structure and pin hole block of cavity ring-down spectroscopy beam path alignment system of the present invention
The schematic diagram of structure, comprising: CCD camera 1, for judging whether optical path collimates；PD detector 2, for detecting cavity-type BPM signal；
Reflecting mirror is plane mirror 3, is optically coupled into optical resonator for emit laser；Diaphragm 4, for judging light
Learn the position of resonant cavity；Pin hole block 5, the structure of pin hole block 5 are cylindrical structure, and one end of cylindrical structure is equipped with concave surface, recessed
The center position in face is additionally provided with groove, and the structure of groove is conical structure, and the top of conical structure is equipped with circular hole, is used for
Collimating optics resonant cavity, optical resonator are made of two curved reflectors 6, and two 6 reflectivity of curved reflector are
99.98。
The present embodiment includes the resonant cavity that the reflecting mirror M1 and M2 that two reflectivity are 99.98 are formed, and R1 and R2 are used to will
Laser transmitting is optically coupled into resonant cavity, and detector PD is used to detect cavity-type BPM signal, and CCD camera is used to judge light
Whether beam collimates.
When light beam does not collimate, optical signalling, specific collimation step can not be received in CCD camera and PD detector
Are as follows:
1: high reflectance reflective mirror M1 and M2 being removed, pin hole P1 is placed at M1, pin hole is as shown in Figure 2.P1 is used to standard
Straight reflective mirror R1.The signal that the position of adjustment R1 receives CCD camera is most strong.
2: another pin hole P2 is placed at M2, P2 is used to collimate reflective mirror M2, places a Zhang Bai at the rear of pin hole P2
Paper, the position for adjusting R2 keep the light intensity on blank sheet of paper maximum.
3: P2 being removed, it is most strong to adjust the signal that M1 receives CCD camera.
4: placing pin hole P2 at M2, place a blank sheet of paper at the rear of pin hole P2, the position for adjusting R2 makes on blank sheet of paper
Light intensity is maximum.
5: repeating step 2-4 until R1 and R2 is adjusted to optimum position.
6: by above step, the light that laser issues can be at the central axes of cavity-type BPM resonator.
7: P1 and P2 being removed, M1 is put back to.The position for changing M1 makes the light being reflected back from M1 by the center diaphragm Iris
Position.
8: M2 is put back to.The position for changing M2 makes the light being reflected back from M2 by the center diaphragm Iris.
9: changing the position of M1 and M2, judge whether the light intensity of optical path is what laser emitted using CCD camera observation
The 95% of the light intensity of light, so far, optical path adjusting finishes.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (9)
1. a kind of cavity ring-down spectroscopy beam path alignment system characterized by comprising
CCD camera (1), for judging whether optical path collimates；
PD detector (2), for detecting cavity-type BPM signal；
Reflecting mirror is optically coupled into optical resonator for emit laser；
Diaphragm (4), for judging the position of optical resonator；
Pin hole block (5) is used for collimating optics resonant cavity.
2. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 1, which is characterized in that the optical resonance
Chamber is made of two curved reflectors (6).
3. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 2, which is characterized in that the curved reflector
(6) it is curved reflector that reflectivity is 99.98.
4. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 1, which is characterized in that the reflecting mirror is flat
Face reflecting mirror (3).
5. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 1, which is characterized in that the pin hole block (5)
Structure be cylindrical structure, one end of the cylindrical structure is equipped with concave surface.
6. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 5, which is characterized in that the center of the concave surface
Groove is additionally provided at position.
7. a kind of cavity ring-down spectroscopy beam path alignment system according to claim 6, which is characterized in that the structure of the groove
Top for conical structure, the conical structure is equipped with circular hole.
8. a kind of cavity-type BPM light using the cavity ring-down spectroscopy beam path alignment system as described in any one of claim 1~6
Compose light path collimation method, which comprises the following steps:
Step 1: placing the pin hole block in order at two curved reflector (6) positions for forming the optical resonator
(5) and using blank sheet of paper with the determination reflecting mirror optimum position；
Step 2: the corresponding pin hole block (5) is removed when the reflecting mirror is in optimum position, places composition institute in order
Two curved reflectors (6) of optical resonator are stated so that the light that two curved reflectors (6) are reflected back passes through the light
Late (4) center；
Step 3: changing the position of two curved reflectors (6) of the optical resonator, sentenced using the CCD camera (1)
The light intensity of disconnected optical path whether be setting maximum value, meet after the maximum value of setting that then beam path alignment adjusting finishes.
9. a kind of cavity ring-down spectroscopy light path collimation method according to claim 8, which is characterized in that the maximum value is
The 95% of the light intensity of the light of the laser transmitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811488495.1A CN109557044A (en) | 2018-12-06 | 2018-12-06 | A kind of cavity ring-down spectroscopy beam path alignment system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811488495.1A CN109557044A (en) | 2018-12-06 | 2018-12-06 | A kind of cavity ring-down spectroscopy beam path alignment system and method |
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| CN109557044A true CN109557044A (en) | 2019-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811488495.1A Pending CN109557044A (en) | 2018-12-06 | 2018-12-06 | A kind of cavity ring-down spectroscopy beam path alignment system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654679A (en) * | 2020-02-24 | 2020-09-11 | 中国工程物理研究院计算机应用研究所 | Multichannel image acquisition processing system for light path collimation control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5815277A (en) * | 1997-06-20 | 1998-09-29 | The Board Of Trustees Of The Leland Stanford Junior Univesity | Deflecting light into resonant cavities for spectroscopy |
| CN103616334A (en) * | 2013-09-12 | 2014-03-05 | 复旦大学 | Cavity ring down aerosol extinction spectrometer |
| CN104819957A (en) * | 2015-02-11 | 2015-08-05 | 中国科学院长春光学精密机械与物理研究所 | CRDS principle-based gas concentration measurement system of continuously adjustable laser light source |
| CN105680300A (en) * | 2016-04-29 | 2016-06-15 | 江苏师范大学 | Accurate calibration method for He-Ne |
| CN105811232A (en) * | 2016-05-06 | 2016-07-27 | 中国科学院合肥物质科学研究院 | Adjustment method for generation-mode excitation light path of passive optical resonant cavity |
-
2018
- 2018-12-06 CN CN201811488495.1A patent/CN109557044A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5815277A (en) * | 1997-06-20 | 1998-09-29 | The Board Of Trustees Of The Leland Stanford Junior Univesity | Deflecting light into resonant cavities for spectroscopy |
| CN103616334A (en) * | 2013-09-12 | 2014-03-05 | 复旦大学 | Cavity ring down aerosol extinction spectrometer |
| CN104819957A (en) * | 2015-02-11 | 2015-08-05 | 中国科学院长春光学精密机械与物理研究所 | CRDS principle-based gas concentration measurement system of continuously adjustable laser light source |
| CN105680300A (en) * | 2016-04-29 | 2016-06-15 | 江苏师范大学 | Accurate calibration method for He-Ne |
| CN105811232A (en) * | 2016-05-06 | 2016-07-27 | 中国科学院合肥物质科学研究院 | Adjustment method for generation-mode excitation light path of passive optical resonant cavity |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111654679A (en) * | 2020-02-24 | 2020-09-11 | 中国工程物理研究院计算机应用研究所 | Multichannel image acquisition processing system for light path collimation control |
| CN111654679B (en) * | 2020-02-24 | 2021-06-15 | 中国工程物理研究院计算机应用研究所 | Multichannel image acquisition processing system for light path collimation control |
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Application publication date: 20190402 |
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