CN112881335A - Low-noise optical fiber air chamber and debugging method thereof - Google Patents
Low-noise optical fiber air chamber and debugging method thereof Download PDFInfo
- Publication number
- CN112881335A CN112881335A CN202110306541.7A CN202110306541A CN112881335A CN 112881335 A CN112881335 A CN 112881335A CN 202110306541 A CN202110306541 A CN 202110306541A CN 112881335 A CN112881335 A CN 112881335A
- Authority
- CN
- China
- Prior art keywords
- collimator
- air chamber
- emergent
- chamber cavity
- incident
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Abstract
The utility model provides a low noise optic fibre air chamber, includes the air chamber cavity that length direction set up along left right direction, is equipped with the gas diffusion hole on the air chamber cavity, and air chamber cavity left end is equipped with two collimator mounting holes, and the central line of two collimator mounting holes all is on a parallel with the air chamber cavity along the central line of left right direction, is equipped with the incident collimator in one collimator mounting hole, is equipped with the emergent collimator in another collimator mounting hole, and air chamber cavity right-hand member inner wall is equipped with the reflection lens. The reason why the optical noise of the present invention is low: the reason why the single fiber air cell introduces large optical noise is that a circulator or a beam splitter must be used, the circulator and the beam splitter cannot completely isolate the emitted laser light, and part of the light is guided to the laser through the optical fiber, which in turn causes the laser to be unable to lock the laser wavelength. The air chamber cavity of the invention uses two collimators which are respectively used for laser emission and laser reception, and no laser returns to the laser, thus effectively reducing optical noise.
Description
Technical Field
The invention belongs to the technical field of optical detection, and particularly relates to a low-noise optical fiber air chamber and a debugging method thereof.
Background
In tunable laser absorption spectrum gas detection, a gas absorption cell is very important, and an optical gas absorption cell is generally arranged, a path of laser signal is introduced, and laser is emitted to a photodiode after being absorbed by the optical gas absorption cell for a single time or multiple times of reflection and absorption, and is converted into an electric signal. However, in some environments with explosion-proof requirements, corrosive gas environments and high temperature environments, the photoelectric detector cannot be arranged, and an optical fiber sensing gas chamber is required. The absorption air chamber is generally provided with an optical fiber, laser is led into the absorption air chamber, and finally returns to the optical fiber after single or multiple reflection, and an optical signal returns to a detection host to be converted into an electric signal.
The existing gas absorption cell generally adopts a single optical fiber structure optical gas absorption cell, laser is emitted after being modulated by a detection host, can be directly focused to an optical fiber core after being absorbed by gas and then passes through the inside of the optical fiber core, after being transmitted by an optical fiber, an optical signal is converted into an electric signal by using a photoelectric converter at the end of an equipment host, the spectrum absorption process is completed in the optical gas absorption cell, the laser in two directions is transmitted by using the same optical fiber, and optical interference can be caused in optical devices such as a circulator or a beam splitter which are connected in series in a light path. In the optical interference, interference fringes are superimposed on the raw detection data during the detection of the photoelectric signal, and these interference fringes are noise which is useless for detecting the raw data, and thus the detection capability of the detection system is reduced. In addition, the core diameter of the optical fiber is only about 0.1um generally, and in the optical gas absorption cell, the final optical fiber of the laser beam needs to be converged into the core diameter of the optical fiber through a collimator, so that the fault tolerance of the system is very small, and the adjustment difficulty is very large.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a low-noise optical fiber air chamber which is small in size, convenient for light path debugging and low in optical noise and a debugging method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a low noise optic fibre air chamber, includes the air chamber cavity that length direction set up along left right direction, is equipped with the gas diffusion hole on the air chamber cavity, and air chamber cavity left end is equipped with two collimator mounting holes, and the central line of two collimator mounting holes all is on a parallel with the air chamber cavity along the central line of left right direction, is equipped with the incident collimator in one collimator mounting hole, is equipped with the emergent collimator in another collimator mounting hole, and air chamber cavity right-hand member inner wall is equipped with the reflection lens.
The incident collimator is connected with the laser emitter through an incident optical fiber, and the emergent collimator is connected with the detection host through an emergent optical fiber.
A debugging method of a low-noise optical fiber air chamber comprises the following steps:
(1) the small adjusting frame is used for oppositely arranging and fixing the incident collimator and the reflecting lens left and right, and the visible light is guided into the incident optical fiber through the laser transmitter, so that the incident light is emitted to the reflecting lens through the incident collimator;
(2) installing an incident collimator into a collimator installation hole of the air chamber cavity, and curing the incident collimator and the air chamber cavity together by using a curing glue solution; mounting an exit collimator in another collimator mounting hole of a plenum chamber
(3) Adjusting the reflection lens, and adjusting the direction of the reflected light to emit to the center of the emergent collimator; connecting an optical power meter or a photodiode with the emergent optical fiber, and enabling the optical power meter or the photodiode to have the strongest signal in the adjusting process;
(4) the emergent optical fiber is connected with the red light emitter, red light is emitted to the reflector through the emergent collimator, and the emergent light direction is adjusted, so that the red light emitted by the emergent collimator can be emitted to the incident collimator through the reflector; connecting an optical power meter or a photodiode with an incident optical fiber, and enabling the optical power meter or the photodiode to have the strongest signal in the adjusting process;
(5) repeating the step (3) and the step (4) to enable the emergent light intensity to reach a maximum value;
(6) curing the emergent collimator and the air chamber cavity together by using a curing glue solution;
(7) curing the reflector and the air chamber cavity together by using a curing glue solution;
(8) and (5) finishing the adjustment of the double-optical-fiber low-interference noise air chamber after the glue solution is cured.
By adopting the technical scheme, the invention has the following technical effects:
the invention can be applied to the conditions of severe industrial control, such as high temperature conditions: the smoke emission content in a combustion furnace and a chimney is monitored, and in the application occasions, because the environment temperature is too high, the photoelectric detector cannot tolerate the high temperature, optical signals need to be led in and out by using optical fibers, and the optical fiber smoke emission content monitoring device is used under the condition that the environment temperature is low and is suitable for the photoelectric detector.
The invention can also be applied to explosion-proof occasions, such as mine monitoring and hydrogen-cooled generator gas component monitoring, and in the occasions, because the detected gas is easy to explode, under the condition that the laser detection host can not meet the explosion-proof requirement, the optical fiber can be used for introducing the optical signal into the measurement site, so that the explosion-proof requirement can be met.
The invention can improve the production efficiency of debugging the optical path pool, reduce the time cost of production and produce products more quickly by using the same debugging tool in the production process, so that the products have more cost advantages.
The reason that the structure of the invention is small is that: multiple reflection is not needed, two small collimators are used, and the size can be effectively reduced.
The reason why the optical noise of the present invention is low: the reason why the single fiber air cell introduces large optical noise is that a circulator or a beam splitter must be used, the circulator and the beam splitter cannot completely isolate the emitted laser light, and part of the light is guided to the laser through the optical fiber, which in turn causes the laser to be unable to lock the laser wavelength. The air chamber cavity of the invention uses two collimators which are respectively used for laser emission and laser reception, and no laser returns to the laser, thus effectively reducing optical noise.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
As shown in fig. 1, the low-noise optical fiber air chamber of the present invention includes an air chamber cavity 1 arranged along the left-right direction in the length direction, the air chamber cavity 1 is provided with air diffusion holes 2, the left end of the air chamber cavity 1 is provided with two collimator mounting holes, the center lines of the two collimator mounting holes are both parallel to the center line of the air chamber cavity 1 along the left-right direction, one collimator mounting hole is provided with an incident collimator 3, the other collimator mounting hole is provided with an emergent collimator 4, and the inner wall of the right end of the air chamber cavity 1 is provided with a reflection lens 5.
The incident collimator 3 is connected with a laser emitter 7 through an incident optical fiber 6, and the emergent collimator 4 is connected with a detection host 9 through an emergent optical fiber 8.
A debugging method of a low-noise optical fiber air chamber comprises the following steps:
(1) the incident collimator 3 and the reflector 5 are oppositely arranged and fixed left and right by using a small adjusting frame, and visible light is guided into the incident optical fiber 6 through the laser emitter 7, so that the incident light is emitted to the reflector 5 through the incident collimator 3;
(2) installing an incident collimator 3 into one collimator installation hole of the air chamber cavity 1, and curing the incident collimator 3 and the air chamber cavity 1 together by using a curing glue solution; mounting the exit collimator 4 in another collimator mounting hole of the air chamber body 1
(3) The adjusting reflector 5 adjusts the direction of the reflected light to emit to the center of the emergent collimator 4; an optical power meter or a photodiode is connected with the emergent optical fiber 8, and the signal of the optical power meter or the photodiode is strongest in the adjusting process;
(4) the emergent optical fiber 8 is connected with the red light emitter, red light is emitted to the reflecting lens 5 through the emergent collimator 4, and the emergent light direction is adjusted, so that the red light emitted by the emergent collimator 4 can be emitted to the incident collimator 3 through the reflecting lens 5; an optical power meter or a photodiode is connected with the incident optical fiber 6, and the signal of the optical power meter or the photodiode is strongest in the adjusting process;
(5) repeating the step (3) and the step (4) to enable the emergent light intensity to reach a maximum value;
(6) curing the emergent collimator 4 and the air chamber cavity 1 together by using a curing glue solution;
(7) curing the reflector 5 and the air chamber cavity 1 together by using a curing glue solution;
(8) and (5) finishing the adjustment of the double-optical-fiber low-interference noise air chamber after the glue solution is cured.
The specific using process of the invention is as follows: the laser emitter 7 emits laser, the laser is guided in by the incident optical fiber 6, is collimated by the incident collimator 3, and is absorbed by gas in the optical gas absorption cell and then is emitted to the reflecting lens 5; after receiving the collimated laser beam, the reflector 5 reflects the laser beam to the emergent collimator 4, after receiving the reflected laser beam, the emergent collimator 4 converges the laser beam to the emergent optical fiber 8, returns to the detection host 9, the detection host 9 further converts the laser beam into a photoelectric signal, and the detection host 9 calculates the absorption ratio of the laser beam to inversely derive the concentration of the gas to be detected.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a low noise optic fibre air chamber, includes the air chamber cavity that length direction set up along left right direction, is equipped with gas diffusion hole, its characterized in that on the air chamber cavity: two collimator mounting holes are formed in the left end of the air chamber cavity, the central lines of the two collimator mounting holes are parallel to the central line of the air chamber cavity in the left-right direction, an incident collimator is arranged in one collimator mounting hole, an emergent collimator is arranged in the other collimator mounting hole, and a reflecting lens is arranged on the inner wall of the right end of the air chamber cavity.
2. A low noise fiber optic gas cell according to claim 1, wherein: the incident collimator is connected with the laser emitter through an incident optical fiber, and the emergent collimator is connected with the detection host through an emergent optical fiber.
3. A debugging method using a low-noise optical fiber gas cell according to claim 2, characterized in that: the method comprises the following steps:
(1) the small adjusting frame is used for oppositely arranging and fixing the incident collimator and the reflecting lens left and right, and the visible light is guided into the incident optical fiber through the laser transmitter, so that the incident light is emitted to the reflecting lens through the incident collimator;
(2) installing an incident collimator into a collimator installation hole of the air chamber cavity, and curing the incident collimator and the air chamber cavity together by using a curing glue solution; mounting an exit collimator in another collimator mounting hole of a plenum chamber
(3) Adjusting the reflection lens, and adjusting the direction of the reflected light to emit to the center of the emergent collimator; connecting an optical power meter or a photodiode with the emergent optical fiber, and enabling the optical power meter or the photodiode to have the strongest signal in the adjusting process;
(4) the emergent optical fiber is connected with the red light emitter, red light is emitted to the reflector through the emergent collimator, and the emergent light direction is adjusted, so that the red light emitted by the emergent collimator can be emitted to the incident collimator through the reflector; connecting an optical power meter or a photodiode with an incident optical fiber, and enabling the optical power meter or the photodiode to have the strongest signal in the adjusting process;
(5) repeating the step (3) and the step (4) to enable the emergent light intensity to reach a maximum value;
(6) curing the emergent collimator and the air chamber cavity together by using a curing glue solution;
(7) curing the reflector and the air chamber cavity together by using a curing glue solution;
(8) and (5) finishing the adjustment of the double-optical-fiber low-interference noise air chamber after the glue solution is cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306541.7A CN112881335A (en) | 2021-03-23 | 2021-03-23 | Low-noise optical fiber air chamber and debugging method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306541.7A CN112881335A (en) | 2021-03-23 | 2021-03-23 | Low-noise optical fiber air chamber and debugging method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112881335A true CN112881335A (en) | 2021-06-01 |
Family
ID=76041884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110306541.7A Pending CN112881335A (en) | 2021-03-23 | 2021-03-23 | Low-noise optical fiber air chamber and debugging method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112881335A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216860A (en) * | 2021-11-29 | 2022-03-22 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
-
2021
- 2021-03-23 CN CN202110306541.7A patent/CN112881335A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216860A (en) * | 2021-11-29 | 2022-03-22 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
| CN114216860B (en) * | 2021-11-29 | 2024-03-19 | 国网重庆市电力公司电力科学研究院 | System and method for detecting decomposition products of insulating gas of high-voltage equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1900696B (en) | Hollow core photon crystal fiber-optic fiber gas sensor | |
| CN112881335A (en) | Low-noise optical fiber air chamber and debugging method thereof | |
| US11867616B2 (en) | Optical detection system | |
| CN106033054A (en) | Laser temperature and humidity measurement apparatus and temperature and humidity measurement method | |
| CN215415035U (en) | Low-noise optical fiber air chamber | |
| CN104949770A (en) | TDLAS (tunable diode laser absorption spectroscopy) gas temperature measurement and detection device | |
| CN216355284U (en) | Wavelength beam combiner, multi-wavelength pump source component and fiber laser | |
| CN102478510A (en) | Spectrum-type sensor for methane detection | |
| CN109632664B (en) | Device for mounting optical probe under high temperature and vibration conditions | |
| CN204988539U (en) | Gaseous temperature measurement detection device of TDLAS based on beam focusing system expands | |
| CN101150368B (en) | Bidirectional optical signal receiving and transmitting device | |
| CN210402615U (en) | Outer broken alarm device is prevented to optic fibre type cable | |
| CN210347443U (en) | Environment atmospheric characteristic gas monitor | |
| CN217156267U (en) | Pure optical fiber air chamber structure | |
| CN202551034U (en) | High-performance semiconductor optical receiver | |
| CN111965769A (en) | Coupling lens capable of realizing light incidence and light return detection | |
| CN104949771A (en) | TDLAS (tunable diode laser absorption spectroscopy) gas temperature measurement and detection method | |
| CN210981733U (en) | Laser visible light composite radiation source | |
| CN104914505B (en) | A kind of pluggable and monitoring adjustable optical attenuator | |
| CN212514859U (en) | High-sensitivity partial discharge sensor for transformer | |
| CN216411428U (en) | Optical fiber probe based on double-optical-fiber self-checking ultraviolet arc light technology | |
| CN205138670U (en) | Gaseous temperature measurement detection device of TDLAS | |
| CN219870994U (en) | Time division multiplexing optical fiber gas detection device | |
| CN203274953U (en) | Temperature sensor system of 1*2 optical fiber | |
| CN215114856U (en) | Light splitting detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |