CN205593908U - Linear light journey air chamber with stabilize packaging structure - Google Patents
Linear light journey air chamber with stabilize packaging structure Download PDFInfo
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- CN205593908U CN205593908U CN201620052257.6U CN201620052257U CN205593908U CN 205593908 U CN205593908 U CN 205593908U CN 201620052257 U CN201620052257 U CN 201620052257U CN 205593908 U CN205593908 U CN 205593908U
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Abstract
The utility model provides a linear light journey air chamber with stabilize packaging structure. Adopt and encapsulate the post, overlap the concave surface speculum that the ring sum has the centre bore, make optics and mechanical element closely laminate or registrate, when realizing the nimble regulating power of air chamber light path, guaranteed that the air chamber light path has the stability to temperature and mechanical stress change. The utility model discloses still providing and having certain elastic buffering circle, kept apart reflecting cavity body optical element with outer packaging body buffering, the optics that has further improved the air chamber is stable.
Description
Technical field
This utility model relates to a kind of long light path air chamber for gas sensing, particularly relates to the long light of stabilization package structure
Journey air chamber, this air chamber is prone to optical path adjusting, has the highest temperature and mechanical stability.
Background technology
The detection of hazardous gas such as gas, carbon monoxide etc., the safety for the dangerous operation such as colliery, oil gas field place is prevented
Protect, find hazardous gas release in early days, prevent trouble before it happens significant.Present stage, adjustable laser absorption spectroscopy techniques
It is widely applied in gas sensing field.This technology utilizes the hazardous gas molecule such as gas, carbon monoxide at near-infrared ripple
The general frequency of section and the characteristic absorption peak of combination band, use the tunable laser in this wavelength band to scan, and obtains characteristic absorption
The intensity at peak, thus the concentration of hazardous gas is extrapolated according to Lambert-beer's law.
Owing to many hazardous gases are more weak at the absworption peak of near infrared band, it usually needs laser is by the gas of very long light path
Room could produce the absorption line that can detect, and this makes the length of air chamber in actual applications reach unacceptable degree.
Common practice is by laser multiple reflections with a pair reflecting mirror, with produce in limited volume long enough light path (as 3 meters with
On), Maurice Herriott air chamber (100) as shown in Figure 1 is the most representational air chamber structure, uses two concave mirrors
(103,104) form reflection cavity, when the incident direction of the light beam that input (101) inputs and position meet certain condition, and light
Bundle at two concave mirror roundtrip, and will keep the collimation of light beam, finally export from outfan (102).
Owing to long light path air chamber is in two reflecting mirror multiple reflections, the factor such as temperature or stress the mild mechanical shape caused
Become and be allowed to produce significantly change by affecting light path, so that the position of shoot laser bundle and angle deviating outfan (102), make
The energy obtaining output beam is greatly attenuated, the hydraulic performance decline of gas sensor.
It addition, to obtain optimal power output, during air chamber assembling, before optical element is fixing, except incident illumination
The angles and positions of bundle need outside regulation, and the distance between two reflecting mirrors is also required to regulation with relative position, and prior art is led to
The mechanical part often using some auxiliary participates in regulation, and their heat and mechanical instability also will affect the stability of light path.
Fig. 2 represents typical air chamber optics and mechanical encapsulation structure in prior art.A pair optical mirror (201,202)
Fitting on two independent pedestals (203,204), pedestal is connected further through encapsulation bar (205).It is in the need of process flexibility
, pedestal and encapsulation bar generally use metal, and its thermal coefficient of expansion is often warm with the optical material of optical mirror (201,202)
The coefficient of expansion does not mates, and causes the thermal instability of optical system；Additionally, pedestal and encapsulation bar metal material are in the effect of external force
Under or due to the residual stress in the course of processing, easily deformation, also causes the change of light path in time.It will be seen that Fig. 2
Although shown encapsulating structure is relatively easy, but Output optical power is easily affected by temperature, stress, mechanical vibration, optical texture
Unstable.
Therefore, have the long light path air chamber of stabilization package structure in the urgent need to.
Utility model content
For the instability problem of the existing encapsulation technology of long light path air chamber, this utility model provides one and has stable
The long light path air chamber of encapsulating structure, to meet gas sensing field to reliable and stable commercially produced product demand.
As it is shown on figure 3, the long light path air chamber (300) with stabilization package structure that this utility model provides, comprise:
1. an input (301), for input beam；
2. an outfan (302), for output beam；
3. the first concave mirror (303), have the first centre bore (308) and the first bonding plane (309) and first anti-
Penetrating face (310), described first reflecting surface has the first focal distance f 1；
4. the second concave mirror (304), have the second centre bore (311) and the second bonding plane (312) and second anti-
Penetrating face (313), described second reflecting surface has the second focal distance f 2；
5. an encapsulation post (305), has external diameter R and length L；
6. first collar (306), have the first internal diameter R1 and the 3rd bonding plane (314)；
7. second collar (307), have the second internal diameter R2 and the 4th bonding plane (315).
First and second reflectings surface of described first and second concave mirrors are relative, and distance is D, forms one
Reflection chamber (320), described input (301) is by the reflection chamber described in incident beam feed-in, in the first and second reflections
Multiple reflections between face, the outfan (302) described in arrival, output beam.
The bore of described first and second centre bores (308,311), more than the external diameter R of encapsulation post, makes the first and second concave surfaces
Distance D between reflecting mirror and their relative position are adjustable before using adhesive fixing.
Length L of described encapsulation post (305) is more than distance D between the first and second concave mirrors, and encapsulation post is from the
One and second first and second centre bores (308,311) of concave mirror pass；Described first and second collars (306,307)
Being placed on encapsulation post, the 3rd bonding plane (314) of described first collar is tight with first bonding plane (309) of the first concave mirror
Laminating, and bonding with adhesive；4th bonding plane (315) of described second collar and the second bonding plane of the second concave mirror
(312) fit tightly, and bonding with adhesive；
Described first and second centre bore bores, the encapsulation external diameter of post, the first and second collar internal diameters can be circular or
Polygon, circular.
Described encapsulation post uses and the first and second concave mirror similar thermal expansion coefficient or identical material, as cut down
Or glass, under preferable case, use identical optical material, such as K9 or high-boron-silicon glass etc., three has identical thermal expansion
Coefficient, air chamber light path is to temperature-insensitive.The first internal diameter R1 and the second internal diameter R2 of described first and second collars (306,307)
Slightly larger than the external diameter R of described encapsulation post, such as bigger 5-20 micron, make first and second collars and the encapsulation tight fit of post, and use
Adhesive is bonding.Under preferable case, first and second collars use thermal coefficient of expansion and the encapsulation post or first and second of material
The similar thermal expansion coefficient or identical of concave mirror optical material.
This utility model provide long light path air chamber, have between reflecting mirror and the collar relation of fitting tightly, encapsulation post and
There is between the collar tight fit relation, ensureing that light path is adjustable while, in turn ensure that adhesive is used only in closely patch
Closing between element, adhesive has the least thickness.Temperature, machinery and the long-term reliability of optical system are by this point
Vital, because adhesive is generally of bigger thermal coefficient of expansion, and the chemically and physically shakiness under hygrothermal environment
Qualitative, its thickness can not be the thickest, should be generally less than 20 microns.
In situations where it is preferred, take Maurice Herriott air chamber to configure (APPLIED OPTICS/Vol.3, No.4/April
1964): set optical axis as Z, make the plane (x-y plane) of the first and second concave mirrors be perpendicular to Z placed in the middle, and make two anti-
Penetrate the focal distance f 1 of mirror, f2 equal for f, i.e. f1=f2=f, and meet following relation with described distance D:
0 ＜ D ＜ 4f (1)
If light-beam position and angle projection on the x-y plane by input (301) are respectively (x0, x0') and (y0,
y0'), when light beam is propagated in reflection cavity (320), the position (x that n-th intersects with the first or second concave reflection mirror planen,
yn) represent then have:
xn=Asin (n θ+α) (2)
yn=Bsin (n θ+β) (3)
Wherein, A and α is and f, D, x0、x0' relevant amount, B and β is and f, D, y0、y0' relevant amount, θ Yu D and f meets
Following relational expression:
Cos (θ)=1-(D/2f) (4)
In a general case, the expression formula of (2) and (3) is that an ellipse, i.e. light beam are at the first or second concave reflection
Track (pip) on mirror plane is elliptic systems, and light beam is without intermediate package post region.In situations where it is preferred,
Original incident light beam position and angle (x0, x0') and (y0, y0') optional certain value so that:
A=B (5)
α=β ± pi/2 (6)
So, as shown in Figure 4, light beam track (405) in the first or second concave mirror (403,404) plane is
Circular distribution, has uniform spacing.
The position of described outfan (402) can select to take up an official post in the first or second concave reflection mirror plane (x-y plane)
One reflection point position, if making light beam reflect n times between two reflecting mirrors, under preferable case, selects the second concave mirror
Last reflection point position (x when upper light beam is gone aroundN, yN), this avoid input and output side on locus
Conflict or crowded, the light path that light beam is passed by from input (401) to outfan (402) simultaneously maximizes.
In situations where it is preferred, the optical fiber collimator that input is band tail optical fiber, described light beam is laser beam, and it passes through tail optical fiber
It is fed into after inputting and collimating in air chamber reflection cavity；Outfan can be the optical fiber collimator that magnetic tape trailer is fine, the laser beam that will accept
It is coupled to optical fiber output, it is possible to direct photo-detector receives.
, inside the first or second concave mirror, conflict therewith in the position of input and outfan.Below can using
Three kinds of modes avoid conflict.The first, as shown in Figure 5 a, the first or second concave mirror (501) includes one little
Hole (502), input or outfan (503) are placed in described aperture；The second, as shown in Figure 5 b, the first or second concave surface
Reflecting mirror (504) includes a V-shaped groove (505), input or outfan (506) and is placed in described V-shaped groove；The third,
As shown in Figure 5 c, at the first or second concave mirror (507) one reflection optical module (508) of upper increase, input or defeated
Go out end (509) and by light beam feed-in or feed out reflection cavity by described reflection optical module, in situations where it is preferred, reflection optics group
Part uses parallelogram prism, or is fed out light beam feed-in by twice total internal reflection.To receiving terminal, except above-mentioned three kinds of sides
Outside method, as fig 5d, also may select photo-detector (511) as outfan, described photo-detector is directly fitted to first
Or second receive light beam on concave mirror (510), after the opto-electronic conversion of photo-detector, export the signal of telecommunication.
Further, this utility model additionally provides the encapsulating structure of optical element with outer enclosure isolation, such as Fig. 6 institute
Show, on the optics shown in Fig. 3 and frame for movement, increase by a pair bumper ring (608) and encapsulation post (605) is fixed to outer package body
(609) on, bumper ring is to have certain elastic rubber ring, and outer package body material is rustless steel, makes the optics unit on encapsulation post
Part is fixed with outer package body through buffering, improves the temperature of long light path air chamber, mechanical stability and reliability.
Described outer package body can be as shown in Figure 6 with air inlet (610) and the sealing structure of gas outlet (611),
Gas to be measured inputs from described air inlet, discharges from described gas outlet.The optical fiber of input and outfan passes through sealed aperture
(612) be connected externally to.Generally, have passed through defecator in addition from the gas to be detected of air inlet input, filter
The material influential on optical surface such as aqueous vapor, dust and harmful gas, it is ensured that the reliability that air chamber works long hours.
Described outer package body can also be the open type structure open to ambient air, this point have in example 2 into
The explanation of one step.
Accompanying drawing explanation
The schematic diagram of Fig. 1 existing long light path air chamber
The encapsulating structure figure of Fig. 2 existing long light path air chamber
The long light path air chamber optics of Fig. 3 this utility model offer and encapsulating structure
The Maurice Herriott air chamber configuration of Fig. 4 circular light spot track
In the long light path air chamber that Fig. 5 a this utility model provides, input and output side fixes schematic diagram by aperture
In the long light path air chamber that Fig. 5 b this utility model provides, input and output side fixes schematic diagram by V-shaped groove
In the long light path air chamber that Fig. 5 c this utility model provides, input and output side by parallelogram prism feed-in or
Feed out light beam
In the long light path air chamber that Fig. 5 d this utility model provides, outfan uses photo-detector to receive light beam
The long light path air chamber embodiment 1 that Fig. 6 this utility model provides
The long light path air chamber embodiment 2 that Fig. 7 this utility model provides
Detailed description of the invention
[embodiment 1]
As shown in Figure 6, the long light path air chamber (600) that this utility model provides, comprise:
1. an input (601), for input beam；
2. an outfan (602), for output beam；
3. the first concave mirror (603), have the first centre bore and the first bonding plane and the first reflecting surface, and described
One reflecting surface has the first focal distance f 1；
4. the second concave mirror (604), have the second centre bore and the second bonding plane and the second reflecting surface, and described
Two reflectings surface have the second focal distance f 2；
5. an encapsulation post (605), has external diameter R and length L；
6. first collar (606), have the first internal diameter R1 and the 3rd bonding plane；
7. second collar (607), have the second internal diameter R2 and the 4th bonding plane.
First and second reflectings surface of described first and second concave mirrors are relative, and distance is D, forms one
Reflection chamber, described input (601) by the reflection chamber described in incident beam feed-in, the first and second concave mirrors it
Between multiple reflections, the outfan (602) described in arrival, output beam.
Described first and second centre bore bores, the encapsulation external diameter of post, the first and second collar internal diameters are circular, the first He
The bore of the second centre bore is more than the external diameter R of encapsulation post, and length L of described encapsulation post (605) is anti-more than the first and second concave surfaces
Penetrating distance D of mirror, encapsulation post passes from the first and second centre bores of the first and second concave mirrors；Described first and
Two collars (606,607) external diameter, slightly larger than the external diameter R about 5-20 micron of encapsulation post, is placed on described encapsulation post, makes first and second
The collar and the encapsulation tight fit of post, and bonding with adhesive.
3rd bonding plane of described first collar and the first bonding plane of the first concave mirror fit tightly, and use viscose glue
Agent is bonding；4th bonding plane of described second collar and the second bonding plane of the second concave mirror fit tightly, and use viscose glue
Agent is bonding.
Described encapsulation post, the first and second concave mirrors, first and second collars all use high borate glass, and three has
Having identical thermal coefficient of expansion, air chamber light path is to temperature-insensitive.
In the present embodiment, take Maurice Herriott air chamber to configure, if optical axis is Z, make the first and second concave mirrors
Plane (x-y plane) is perpendicular to Z placed in the middle, and makes the focal distance f 1 of two reflecting mirrors, f2 equal for f, i.e. f1=f2=f, and with
Described distance D meets aforementioned (1) formula relation.
The light-beam position of input (601) is set and angle makes aforementioned (2) formula meet aforementioned pass to A and B in (4) formula
Being formula (5), α and β meets foregoing relationships (6) so that light beam luminescent spot track on the first and second concave reflection mirror planes
For circular distribution as shown in Figure 4, there is uniform spacing.
The position of described outfan (602) selects when the second concave reflection mirror plane (x-y plane) light beam is gone around
Last reflection point position, the light path making light beam be passed by from input (601) to outfan (602) maximizes.
In the present embodiment, input is the optical fiber collimator of band tail optical fiber, and light beam is laser beam, and laser beam is defeated by tail optical fiber
It is fed into after entering and collimating in air chamber reflection cavity；Outfan is also the optical fiber collimator of band tail optical fiber, the laser beam coupling that will accept
Export to tail optical fiber.First or second concave mirror respectively comprises an aperture, input and outfan collimator be fixed on
Input and reception laser beam in aperture.
The present embodiment also comprises a pair bumper ring (608) and an outer package body (609), and described bumper ring will encapsulate post
(605) being fixed on described outer package body, bumper ring uses has certain elastic elastomeric material, makes the optics unit on encapsulation post
Part is fixed with outer package body through buffering, improves the temperature of long light path air chamber, mechanical stability and reliability.
Described outer package body is that material is rustless steel, treats with air inlet (610) and the sealing structure of gas outlet (611)
Survey gas to input from described air inlet, discharge from described gas outlet.The tail optical fiber of input and outfan passes through sealed aperture (612)
Be connected externally to.
[embodiment 2]
As it is shown in fig. 7, the long light path air chamber (700) that this utility model provides, the 2nd embodiment has and embodiment 1 class
As optically and mechanically structure, use the configuration of Maurice Herriott air chamber the most equally.Difference is, outer package body (709)
It is an open type structure open to ambient air, it is no longer necessary to air inlet and gas outlet, 3 columns in outer package body are even
Outer package body left and right two parts are connected by extension bar (708), only draw two column connecting rods in Fig. 7.
Input (701) is still the optical fiber collimator of band tail optical fiber, complete interior by twice of parallelogram prism (707)
Reflect the laser beam after being collimated by input and be fed into reflection cavity, the first concave mirror (703) is no longer necessary to fixing optical fiber
The aperture of collimator, optical fiber collimator and described parallelogram prism are fixed on the first concave mirror.
Outfan (702) uses photo-detector, directly fits to the second concave mirror (704) upper light beam when going around
Last reflection point position, is converted optical signal into the signal of telecommunication and is exported by electric lead (712).
Claims (18)
1. a long light path air chamber with stabilization package structure, it is characterised in that include:
One input, for input beam；
One outfan, for output beam；
First concave mirror, has the first centre bore and the first bonding plane and the first reflecting surface, described first reflection mask
There is the first focal distance f 1；
Second concave mirror, has the second centre bore and the second bonding plane and the second reflecting surface, described second reflection mask
There is the second focal distance f 2；
One encapsulation post, has external diameter R and length L；
First collar, has the first internal diameter R1 and the 3rd bonding plane；
Second collar, has the second internal diameter R2 and the 4th bonding plane；
First and second reflectings surface of described first and second concave mirrors are relative, and distance is D, forms a reflection
Cavity, described input, by the reflection chamber described in incident beam feed-in, multiple reflections between the first and second reflectings surface, arrives
Reach described outfan, output beam；
The bore of described first and second centre bores is more than first more than the external diameter R of described encapsulation post, length L of described encapsulation post
And distance D that second between concave mirror, encapsulation post passes from described first and second centre bores；Described first and second sets
Internal diameter R1 and R2 of ring is slightly larger than the external diameter R of described encapsulation post, and is placed on encapsulation post, between bonding with adhesive；
3rd bonding plane of described first collar and the first bonding plane of the first concave mirror fit tightly, and glue with adhesive
Connect；4th bonding plane of described second collar and the second bonding plane of the second concave mirror fit tightly, and glue with adhesive
Connect.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described first
It is 5 to 20 microns with internal diameter R1 and R2 of second collar more than the external diameter R of described encapsulation post.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described first
It is circular or polygon with the second centre bore bore, encapsulation post external diameter, the first and second collar internal diameters.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described input
End is the optical fiber collimator with tail optical fiber.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described output
End is the optical fiber collimator with tail optical fiber or photo-detector.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described encapsulation
Post uses thermal coefficient of expansion and described first and second concave mirror similar thermal expansion coefficient or identical material.
A kind of long light path air chamber with stabilization package structure the most according to claim 6, it is characterised in that described encapsulation
Post uses and can cut down or the glass material identical with described first and second concave mirrors.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described first
Or second concave mirror also comprise an aperture, described input or outfan are fixed in described aperture.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that described first
Or second concave mirror also comprise a V-shaped groove, described input or outfan are fixed in described V-shaped groove.
A kind of long light path air chamber with stabilization package structure the most according to claim 1, it is characterised in that the most at least
Comprise a reflection optical module, by described input light beam feed-in reflection cavity, or light beam is fed out described outfan.
11. a kind of long light path air chambers with stabilization package structure according to claim 10, it is characterised in that described instead
Penetrating optical module is a parallelogram prism.
12. a kind of long light path air chambers with stabilization package structure according to claim 1, it is characterised in that described instead
Penetrating cavity uses the configuration of Maurice Herriott air chamber, described first focal distance f 1 and described second focal distance f 2 equal for f, and with described first
And second distance D between concave mirror meet 0 ＜ D ＜ 4f.
13. a kind of long light path air chambers with stabilization package structure according to claim 12, it is characterised in that described defeated
Enter to hold the choosing so that light beam track on the first and second concave reflection mirror planes is circle of the position of feed-in light beam and direction
Shape, has uniform spacing.
14. have the long light path air chamber of stabilization package structure according to any one described in claim 1 to 13, it is characterised in that
Also comprising a pair bumper ring and an outer package body, described encapsulation post is fixed with described outer package body by described bumper ring.
15. a kind of long light path air chambers with stabilization package structure according to claim 14, it is characterised in that described slow
Punching circle is to have certain elastic rubber ring.
16. a kind of long light path air chambers with stabilization package structure according to claim 14, it is characterised in that outside described
Package material is rustless steel.
17. a kind of long light path air chambers with stabilization package structure according to claim 14, it is characterised in that outside described
Packaging body is the sealing structure with air inlet and gas outlet.
18. a kind of long light path air chambers with stabilization package structure according to claim 14, it is characterised in that outside described
Packaging body is open type structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620052257.6U CN205593908U (en) | 2016-01-12 | 2016-01-12 | Linear light journey air chamber with stabilize packaging structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620052257.6U CN205593908U (en) | 2016-01-12 | 2016-01-12 | Linear light journey air chamber with stabilize packaging structure |
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| CN205593908U true CN205593908U (en) | 2016-09-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290248A (en) * | 2016-10-08 | 2017-01-04 | 山东微感光电子有限公司 | Oil-gas mining and accumulating dangerous leakage gas optical fiber sensing system device |
| CN106959271A (en) * | 2016-01-12 | 2017-07-18 | 徐州旭海光电科技有限公司 | Long light path air chamber with stabilization package structure |
| CN107064008A (en) * | 2017-03-15 | 2017-08-18 | 南京航空航天大学 | A kind of anti-vibration long light path gas pond |
| CN111148986A (en) * | 2019-12-20 | 2020-05-12 | 徐州旭海光电科技有限公司 | Compact sensing device |
-
2016
- 2016-01-12 CN CN201620052257.6U patent/CN205593908U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959271A (en) * | 2016-01-12 | 2017-07-18 | 徐州旭海光电科技有限公司 | Long light path air chamber with stabilization package structure |
| CN106290248A (en) * | 2016-10-08 | 2017-01-04 | 山东微感光电子有限公司 | Oil-gas mining and accumulating dangerous leakage gas optical fiber sensing system device |
| CN107064008A (en) * | 2017-03-15 | 2017-08-18 | 南京航空航天大学 | A kind of anti-vibration long light path gas pond |
| CN107064008B (en) * | 2017-03-15 | 2019-12-24 | 南京航空航天大学 | Anti-vibration long-optical-path gas pool |
| CN111148986A (en) * | 2019-12-20 | 2020-05-12 | 徐州旭海光电科技有限公司 | Compact sensing device |
| CN111148986B (en) * | 2019-12-20 | 2023-02-10 | 徐州旭海光电科技有限公司 | Compact sensing device |
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Address after: 221000 No. 99 Xu Hai Road, Xuzhou economic and Technological Development Zone, Xuzhou, Jiangsu Patentee after: Jiangsu Xuhai Photoelectric Technology Co.,Ltd. Address before: 221004 Room 208, Service Center, Clean Technology Industrial Park, Xuzhou Economic and Technological Development Zone, Jiangsu Province Patentee before: XUZHOU XUHAI OPTO-ELECTRONIC TECHNOLOGIES Co.,Ltd. |
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Addressee: Sun Dongmei Document name: Notification of Qualified Procedures |
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| DD01 | Delivery of document by public notice |