CN209167590U - A kind of laser signal reception device under open optical path - Google Patents
A kind of laser signal reception device under open optical path Download PDFInfo
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- CN209167590U CN209167590U CN201920086655.3U CN201920086655U CN209167590U CN 209167590 U CN209167590 U CN 209167590U CN 201920086655 U CN201920086655 U CN 201920086655U CN 209167590 U CN209167590 U CN 209167590U
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- displacement platform
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Abstract
The utility model discloses the laser signal reception devices under a kind of open optical path.The utility model includes metal shell, and two degrees of freedom displacement platform, condenser lens, the first screw rod stepper motor, the second screw rod stepper motor, multimode fibre, the first spring and second spring are equipped in the metal shell；The condenser lens is fixed on the centre of two degrees of freedom displacement platform upper end；The upper surface of the two degrees of freedom displacement platform is contradicted with the screw rod bottom of the first screw rod stepper motor and the screw rod bottom of the second screw rod stepper motor, so that two degrees of freedom displacement platform is carried out the angle in X-axis and Y direction by the movement of screw rod and is adjusted；The lower end center of the two degrees of freedom displacement platform connects multimode fibre, and the receiving end of multimode fibre is made to be located at the focal point of condenser lens.When the relative position at Laser emission end and receiving end frequently changes, the utility model can make complete laser signal enter optical fiber, ensure the accuracy of measurement.
Description
Technical field
The utility model relates to laser signal reception device, the laser signal under especially a kind of open optical path receives dress
It sets, particularly for the frequent changed occasion in the relative position of laser signal transmitting terminal and laser signal receiving end.
Background technique
Tunable diode laser absorption spectroscopy (Tunable Diode Laser Absorption Spectroscopy,
TDLAS) analysis method is common analysis method for gases, mainly special using the tunable and narrow linewidth of semiconductor laser
Property, it is measured by selecting certain specific absorption spectrum line of under test gas, the interference of the spectrum of other gases can be excluded,
Realize the quick online detection of under test gas concentration.TDLAS gas concentration measurement system needs a Laser emission end and one
Laser pick-off end, laser spontaneous emission end-fire goes out to be mapped to laser pick-off end after under test gas, according to declining for laser signal intensity
Subtract to calculate under test gas concentration.
Traditional laser signal reception device mainly for enclosed environments such as optical path pool, gas absorption cells (as shown in Figure 1, Figure 2),
Its laser pick-off end and the position for receiving laser are usually unchanged.
It, can be in the direct deployed fiber in laser signal receiving end, laser pick-off end construction in the case where light path is shorter
As shown in Fig. 1 dotted line frame, laser can enter the optical fiber disposed receiving end after passing through gas absorption cell more conveniently.In light
In the longer situation of journey, it is contemplated that the laser beam of receiving end has certain diverging, and receiving end hot spot can be greater than fibre diameter,
Its laser pick-off end is constructed as shown in Fig. 2 dotted line frame, such receiving end can place condenser lens at laser terminal hot spot, and
Optical fiber is placed on to the focal point of condenser lens, laser beam enters optical fiber after over-focusing.
Conventional method is designed mainly for closed optical path, and Laser emission end and the position at laser pick-off end remain unchanged,
It fixes after improving, laser beam can be parallel to the optical axis of optical fiber or receiving lens always, be not likely to produce dropout.
Under open optical path, since the relative position of laser signal transmitting terminal and laser signal receiving end frequently becomes
Change, laser signal and receiving end lens axis often have certain drift angle, and the laser after focusing is difficult to enter optical fiber, leads to laser
Dropout influences the accuracy of measurement.
Utility model content
Technical problem to be solved in the utility model is to overcome the problems of the above-mentioned prior art, provides a kind of opening
Laser signal reception device under optical path can converge to the directional light from different angle in a piece optical fiber, with effective
It ensures that complete laser signal enters optical fiber, ensures the accuracy of measurement.
For this purpose, the utility model adopts the following technical solutions: a kind of laser signal reception device under open optical path, packet
Metal shell is included, is equipped with two degrees of freedom displacement platform, condenser lens, the first screw rod stepper motor, second in the metal shell
Screw rod stepper motor, multimode fibre, the first spring and second spring；
The condenser lens is fixed on the centre of two degrees of freedom displacement platform upper end, and condenser lens will be for that will receive
Laser facula be focused, the hot spot after focusing is located on the focal plane of condenser lens；
The screw rod bottom and the second screw rod stepping of the upper surface of the two degrees of freedom displacement platform and the first screw rod stepper motor
The screw rod bottom of motor contradicts, and so that two degrees of freedom displacement platform is carried out the angle tune in X-axis and Y direction by the movement of screw rod
It is whole；The first spring and second spring, the first bullet are set between the lower end surface of two degrees of freedom displacement platform and the bottom surface of metal shell inner wall
Spring is located at immediately below the screw rod of the first screw rod stepper motor, is used to support two degrees of freedom displacement platform herein, make herein two from
By the screw rod synchronization action of degree displacement platform and the first screw rod stepper motor, freely adjust the angle in the X-axis direction；Second spring position
Immediately below the screw rod of the second screw rod stepper motor, it is used to support two degrees of freedom displacement platform herein, makes two degrees of freedom herein
The screw rod synchronization action of displacement platform and the second screw rod stepper motor, freely adjusts the angle in the Y-axis direction；
The lower end center of the two degrees of freedom displacement platform connects multimode fibre, is located at the receiving end of multimode fibre and focuses thoroughly
The focal point of mirror, to receive complete laser signal.
Further, the incident angle θ of the multimode fibre and the focal length f of condenser lens and it is mapped to condenser lens (1)
Laser maximum spot radius r adaptation.
Further, the θ >=arctan (r/f).
Further, the height d of the two degrees of freedom displacement platform and the focal length f of condenser lens are equal.
Further, the screw rod of the first screw rod stepper motor contradicts in the left side of two degrees of freedom displacement platform upper surface
End, the screw rod of the second screw rod stepper motor contradict the front side end in two degrees of freedom displacement platform upper surface.
Further, the right-hand end of two degrees of freedom displacement platform lower end surface is fixedly connected with first support；Two degrees of freedom position
The rear side end of moving stage lower end surface is fixedly connected with second support.Pass through first support, second support, the first spring and second spring
It is used cooperatively, forms the multi-point support of two degrees of freedom displacement platform, keep two degrees of freedom displacement platform steady when acting.
Further, the screw rod center of the first screw rod stepper motor and the center of the first spring are located at same axis
On.By this setting, keep the utility model two degrees of freedom displacement platform more stable when angle adjusts in the X-axis direction.
Further, the screw rod center of the second screw rod stepper motor and the center of second spring are located at same axis
On.By this setting, keep the utility model two degrees of freedom displacement platform more stable when angle adjusts in the Y-axis direction.
Further, the two degrees of freedom displacement platform is hollow, guarantees that laser optical path is not blocked.
Further, the first screw rod stepper motor and the second screw rod stepper motor pass through connecting rod and metal shell
Inner sidewall is fixedly connected.Screw rod stepper motor is fixed on the inner sidewall of metal shell by connecting rod.
The utility model has the following beneficial effects: condenser lens is fixed on two degrees of freedom displacement platform by the utility model
On, two-dimentional position-adjustable ensures that the laser light velocity from different angle can focus to same point；When Laser emission end and connect
When the relative position of receiving end frequently changes, the utility model can make complete laser signal enter optical fiber, ensure measurement
Accuracy.
Detailed description of the invention
Fig. 1 is the laser pick-off end structure schematic diagram under short light path in the prior art；
Fig. 2 is the laser pick-off end structure schematic diagram under long light path in the prior art；
Fig. 3 is the structural schematic diagram of the utility model；
Fig. 4 is the side view of the utility model two degrees of freedom displacement platform.
In Fig. 1-2, A- optical fiber, B- collimator, C- gas absorption cell, the D- laser light velocity, E- laser pick-off end, F- focuses saturating
Mirror；
In Fig. 3-4,1- condenser lens, 2- two degrees of freedom displacement platform, 3- the first screw rod stepper motor, 4- the second screw rod stepping
Motor, 5- metal shell, 6- multimode fibre, the first spring of 7-, 8- second spring, 9- first support, 10- second support.
Specific embodiment
To make being more clear, understanding for the purpose of this utility model, technical solution and advantage expression, with reference to the accompanying drawing and
Embodiment is further described in detail the utility model again.
Laser signal reception device under a kind of open optical path as shown in Figure 3-4, metal shell 5 is interior to be equipped with two degrees of freedom
Displacement platform 2, condenser lens 1, the first screw rod stepper motor 3, the second screw rod stepper motor 4, multimode fibre 6, the first spring 7 and
Two springs 8, the two degrees of freedom displacement platform 2 are hollow.
The condenser lens 1 is fixed on the centre of 2 upper end of two degrees of freedom displacement platform, and condenser lens 1 will be for that will connect
The laser facula received is focused, and the hot spot after focusing is located on the focal plane of condenser lens 1.
The screw rod bottom and the second screw rod of the upper surface of the two degrees of freedom displacement platform 2 and the first screw rod stepper motor 3 walk
It is contradicted into the screw rod bottom of motor 4, so that two degrees of freedom displacement platform 2 is carried out the angle in X-axis and Y direction by the movement of screw rod
Degree adjustment；The first spring 7 and second spring 8 are set between the lower end surface of two degrees of freedom displacement platform 2 and the bottom surface of metal shell inner wall,
First spring 8 is located at immediately below the screw rod of the first screw rod stepper motor 3, is used to support two degrees of freedom displacement platform herein, makes this
The screw rod synchronization action of the two degrees of freedom displacement platform 2 at place and the first screw rod stepper motor 3, freely adjusts the angle in the X-axis direction；
Second spring 8 is located at immediately below the screw rod of the second screw rod stepper motor 3, is used to support two degrees of freedom displacement platform herein, makes this
The screw rod synchronization action of the two degrees of freedom displacement platform 2 at place and the second screw rod stepper motor 4, freely adjusts the angle in the Y-axis direction.
The lower end center of the two degrees of freedom displacement platform 2 connects multimode fibre 6, is located at the receiving end of multimode fibre 6 poly-
The other end of the focal point of focus lens 1, multimode fibre 6 is connected to laser detector.
Preferably, the incident angle θ of the multimode fibre 6 and the focal length f of condenser lens 1 and it is mapped to condenser lens (1)
Laser maximum spot radius r adaptation.θ >=the arctan (r/f).The height d and condenser lens 1 of two degrees of freedom displacement platform 2
Focal length f it is equal.
Preferably, the screw rod of the first screw rod stepper motor 3 contradicts in the left side of 2 upper surface of two degrees of freedom displacement platform
End, the screw rod of the second screw rod stepper motor 4 contradict the front side end in 2 upper surface of two degrees of freedom displacement platform.The two degrees of freedom position
The right-hand end of 2 lower end surface of moving stage is fixedly connected with first support 9；The rear side end of 2 lower end surface of two degrees of freedom displacement platform is fixedly connected with
Two brackets 10.
Preferably, the screw rod center of the first screw rod stepper motor 3 and the center of the first spring 7 are located at same axis
On.The screw rod center of second screw rod stepper motor 4 and the center of second spring 8 are located on same axis.
Preferably, the first screw rod stepper motor 3 and the second screw rod stepper motor 4 pass through connecting rod 11 and metal shell
5 inner sidewall is fixedly connected.
Above embodiment is described some details of the utility model, but should not be understood as to this reality
With novel limitation, those skilled in the art is not in the case where departing from the principles of the present invention and objective originally practical new
It can be changed, be modified in the range of type, replacement and variant.
Claims (10)
1. the laser signal reception device under a kind of open optical path, including metal shell (5), which is characterized in that the metal
Two degrees of freedom displacement platform (2), condenser lens (1), the first screw rod stepper motor (3), the second screw rod stepping electricity are equipped in shell (5)
Machine (4), multimode fibre (6), the first spring (7) and second spring (8)；
The condenser lens (1) is fixed on the centre of two degrees of freedom displacement platform (2) upper end, and condenser lens (1) is used for will
The laser facula received is focused, and the hot spot after focusing is located on the focal plane of condenser lens (1)；
The screw rod bottom and the second screw rod of the upper surface of the two degrees of freedom displacement platform (2) and the first screw rod stepper motor (3) walk
It is contradicted into the screw rod bottom of motor (4), carries out two degrees of freedom displacement platform (2) in X-axis and Y direction by the movement of screw rod
Angle adjustment；The first spring (7) and are set between the lower end surface of two degrees of freedom displacement platform (2) and the bottom surface of metal shell inner wall
Two springs (8), the first spring (7) are located at immediately below the screw rod of the first screw rod stepper motor (3), are used to support two freedom herein
Displacement platform is spent, makes the screw rod synchronization action of two degrees of freedom displacement platform (2) and the first screw rod stepper motor (3) herein, in X-axis side
It freely adjusts the angle upwards；Second spring (8) is located at immediately below the screw rod of the second screw rod stepper motor (4), is used to support herein
Two degrees of freedom displacement platform, keep two degrees of freedom displacement platform (2) herein and the screw rod of the second screw rod stepper motor (4) synchronous dynamic
Make, freely adjusts the angle in the Y-axis direction；
The lower end center of the two degrees of freedom displacement platform (2) connects multimode fibre (6), is located at the receiving end of multimode fibre (6)
The focal point of condenser lens (1).
2. laser signal reception device according to claim 1, which is characterized in that the incidence angle of the multimode fibre (6)
Degree θ and the focal length f of condenser lens (1) and the laser maximum spot radius r for being mapped to condenser lens (1) are adapted to.
3. laser signal reception device according to claim 2, which is characterized in that the θ >=arctan (r/f).
4. laser signal reception device according to claim 2, which is characterized in that the two degrees of freedom displacement platform (2)
Height d is equal with the focal length f of condenser lens (1).
5. laser signal reception device according to claim 1-4, which is characterized in that the first screw rod stepping
The screw rod of motor (3) contradicts the left-hand end in two degrees of freedom displacement platform (2) upper surface, the screw rod of the second screw rod stepper motor (4)
Contradict the front side end in two degrees of freedom displacement platform (2) upper surface.
6. laser signal reception device according to claim 5, which is characterized in that under the two degrees of freedom displacement platform (2)
The right-hand end of end face is fixedly connected with first support (9)；The rear side end of two degrees of freedom displacement platform (2) lower end surface is fixedly connected with second
Frame (10).
7. laser signal reception device according to claim 5, which is characterized in that the first screw rod stepper motor (3)
Screw rod center and the center of the first spring (7) be located on same axis.
8. laser signal reception device according to claim 5, which is characterized in that the second screw rod stepper motor (4)
Screw rod center and the center of second spring (8) be located on same axis.
9. laser signal reception device according to claim 1-4, which is characterized in that the two degrees of freedom position
Moving stage (2) is hollow.
10. laser signal reception device according to claim 1-4, which is characterized in that first screw rod
Stepper motor (3) and the second screw rod stepper motor (4) are fixedly connected by connecting rod (11) with the inner sidewall of metal shell (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920086655.3U CN209167590U (en) | 2019-01-18 | 2019-01-18 | A kind of laser signal reception device under open optical path |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920086655.3U CN209167590U (en) | 2019-01-18 | 2019-01-18 | A kind of laser signal reception device under open optical path |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557615A (en) * | 2019-01-18 | 2019-04-02 | 国网浙江省电力有限公司电力科学研究院 | Laser signal reception device and method of reseptance under a kind of open optical path |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557615A (en) * | 2019-01-18 | 2019-04-02 | 国网浙江省电力有限公司电力科学研究院 | Laser signal reception device and method of reseptance under a kind of open optical path |
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