CN110763629A - Coaxial gas telemeter optical assembly - Google Patents
Coaxial gas telemeter optical assembly Download PDFInfo
- Publication number
- CN110763629A CN110763629A CN201911200235.4A CN201911200235A CN110763629A CN 110763629 A CN110763629 A CN 110763629A CN 201911200235 A CN201911200235 A CN 201911200235A CN 110763629 A CN110763629 A CN 110763629A
- Authority
- CN
- China
- Prior art keywords
- axis
- parabolic reflector
- optical
- axis parabolic
- gas
- 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
- G01N21/01—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
- G01N21/17—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
Landscapes
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The application is suitable for the technical field of gas detection, and provides an optical assembly of a coaxial gas telemeter. The embodiment of the application provides an optical assembly of a coaxial gas telemeter, which comprises an off-axis parabolic reflector with a through hole arranged along the direction of an optical axis, a collimation laser and a light detector, so that a detection laser beam emitted by the collimation laser passes through the through hole, is transmitted to an area where gas to be detected is located along the direction parallel to the direction of the optical axis of the off-axis parabolic reflector, and is reflected by a reflection point of the area where the gas to be detected is located, is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector and is reflected to the photosensitive surface of the light detector by the reflecting surface of the off-axis parabolic reflector, the detection laser beam emitted by the collimation laser and the detection laser beam reflected by the reflection point are coaxial, the optical detector can detect gas at a long distance and gas at a short distance, and the signal-to-noise ratio is high and the structure is simple.
Description
Technical Field
The application belongs to the technical field of gas detection, and particularly relates to an optical assembly of a coaxial gas telemeter.
Background
The gas detection technology is mainly applied to the fields of coal, petrochemical industry, electric power, metallurgy, municipal engineering and the like which are possibly inflammable and explosive and have pollution gas leakage and have great threats to the safety and health of lives and properties of people. The existing gas detector can remotely detect dangerous or polluted gases such as natural gas and the like, but cannot simultaneously meet the requirements of gas measurement at a long distance and a short distance, high signal-to-noise ratio and simple structure.
Disclosure of Invention
In view of this, the embodiments of the present application provide an optical assembly of a coaxial gas telemeter, so as to solve the problem that the conventional gas telemeter cannot simultaneously satisfy the requirements of gas measurement at a long distance and a short distance, high signal-to-noise ratio, and simple structure.
The embodiment of the application provides a coaxial gas telemeter optical assembly, includes:
an off-axis parabolic reflector having a through hole disposed along the optical axis;
the collimation laser is arranged on one side of the off-axis parabolic reflector and is used for emitting a detection laser beam;
a light detector for receiving and detecting the detection laser beam;
the detection laser beam penetrates through the through hole, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is reflected by the reflection point of the area where the gas to be detected is located, is transmitted to the reflection surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector, and is reflected to the photosensitive surface of the optical detector through the reflection surface of the off-axis parabolic reflector.
In one embodiment, the light outlet hole of the collimation laser faces to the through hole, and the optical axis of the collimation laser is coincident with the optical axis of the off-axis parabolic reflector.
In one embodiment, the light detector is disposed at a focal plane of the off-axis parabolic reflector and a light-sensing surface of the light detector faces the reflecting surface of the off-axis parabolic reflector.
In one embodiment, the on-axis gas telemeter optical assembly further comprises a turning reflector disposed on one side of the off-axis parabolic reflector, and a reflecting surface of the turning reflector faces the light outlet hole of the collimating laser and the through hole;
and the detection laser beam penetrates through the through hole and is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected to the through hole by the steering reflector.
In one embodiment, the on-axis gas telemeter optical assembly further comprises a folding mirror intersecting the focal plane of the off-axis parabolic mirror and having a reflecting surface facing the reflecting surface of the off-axis parabolic mirror and the photosensitive surface of the photodetector;
the detection laser beam is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected by the reflecting point, is reflected to the reflecting surface of the folding reflector by the reflecting surface of the off-axis parabolic reflector, and is reflected to the photosensitive surface of the optical detector by the reflecting surface of the folding reflector.
In one embodiment, the coaxial gas telemeter optical assembly further comprises an indication laser, and a light outlet of the indication laser faces to the area where the gas to be detected is located and is used for emitting a visible indication laser beam;
and the visible indication laser beam is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector.
In one embodiment, the optical assembly of the coaxial gas telemeter further comprises an optical filter, which is disposed on one side of the off-axis parabolic reflector where the reflecting surface is located and perpendicular to the optical axis of the off-axis parabolic reflector, and is configured to filter stray light other than the detection laser beam emitted by the collimated laser and the detection laser beam reflected back by the reflecting point;
the detection laser beam penetrates through the through hole, passes through the optical filter, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is reflected by the reflection point, is filtered by the optical filter, and is transmitted to the reflection surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector.
In one embodiment, the off-axis angle of the off-axis parabolic reflector ranges from 30 ° to 120 °.
In one embodiment, the photodetector comprises a photodiode chip.
In one embodiment, the photodiode chip has a diameter in the range of 0.1mm to 0.5 mm.
The embodiment of the application provides an optical assembly of a coaxial gas telemeter, which comprises an off-axis parabolic reflector with a through hole arranged along the direction of an optical axis, a collimation laser and a light detector, so that a detection laser beam emitted by the collimation laser passes through the through hole, is transmitted to an area where gas to be detected is located along the direction parallel to the direction of the optical axis of the off-axis parabolic reflector, and is reflected by a reflection point of the area where the gas to be detected is located, is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector and is reflected to the photosensitive surface of the light detector by the reflecting surface of the off-axis parabolic reflector, the detection laser beam emitted by the collimation laser and the detection laser beam reflected by the reflection point are coaxial, the optical detector can detect gas at a long distance and gas at a short distance, and the signal-to-noise ratio is high and the structure is simple.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 to 16 are schematic structural views of an optical assembly of a coaxial gas telemeter according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
As shown in any one of fig. 1 to 8, an embodiment of the present application provides an optical assembly of a coaxial gas telemeter, including:
an off-axis parabolic reflector 1 having a through hole 11 arranged in the direction of the optical axis;
a collimation laser 2 arranged at one side of the off-axis parabolic reflector 1 and used for emitting a detection laser beam;
a photodetector 3 for receiving and detecting the detection laser beam;
the detection laser beam penetrates through the through hole, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector 1, is reflected by the reflection point of the area where the gas to be detected is located, is transmitted to the reflection surface of the off-axis parabolic reflector 1 along the direction parallel to the optical axis of the off-axis parabolic reflector 1, and is reflected to the photosensitive surface of the optical detector 3 through the reflection surface of the off-axis parabolic reflector 1.
In application, the off-axis parabolic reflector can be set into regular shapes such as a cylinder, a triangular prism, a trapezoid and the like according to actual needs, and specifically can be a cylinder. The off-axis angle of the off-axis parabolic reflector can be set to be any angle between 30 degrees and 120 degrees according to actual needs, and specifically can be 90 degrees. The off-axis parabolic reflector has good aberration characteristics, small imaging light spots and high signal-to-noise ratio.
In application, the cross section of the through hole can be set to be in a regular shape such as a circle, an ellipse, a square or any other regular polygon according to actual needs, and particularly can be in a circle. The diameter of the cross-section of the through-hole should be greater than or equal to the diameter of the detection laser beam emitted by the collimation laser. The openings at the two ends of the through hole are respectively positioned on the reflecting surface and one side surface of the off-axis parabolic reflector.
In application, the collimating laser is provided with a collimating lens, and the collimating lens is used for expanding and collimating the detection laser beam. The collimating laser may be directly mounted to the off-axis parabolic mirror, and specifically may be located on the same side of the off-axis parabolic mirror as the opening at the one end of the through hole. The collimating laser is directly assembled on the off-axis parabolic reflector, so that the relative position relation between the collimating laser and the off-axis parabolic reflector is not influenced by external factors such as temperature change, mechanical vibration and the like, and the reliability is high.
In one embodiment, the photodetector comprises a photodiode chip.
In one embodiment, the photodiode chip has a diameter in the range of 0.1mm to 0.5 mm.
In application, the light detector may be implemented by a Photo-Diode (Photo-Diode), including at least one photodiode. The off-axis parabolic reflector has the characteristics of good aberration characteristic, small imaging light spot, high signal-to-noise ratio and the like, so that the light detector can use a small-area photodiode, and the small-area photodiode has the advantages of small dark current and high signal-to-noise ratio. The diameter range of the photodiode can be set to any value of 0.1mm to 0.5mm, for example, 0.3mm, according to actual needs.
In application, the off-axis parabolic reflector, the collimating laser and the optical detector can also be fixed through the support, the specific shape structure of the support can be set according to actual needs, and the requirement that the coaxial gas telemeter optical assembly is stably integrated and fixed into a whole can be met.
In application, the detection laser beam may be an ultraviolet laser beam or an infrared laser beam. The reflection point is a point on a background object or any solid object in the area where the gas to be measured is located.
In one embodiment, the light outlet hole of the collimation laser faces to the through hole, and the optical axis of the collimation laser is coincident with the optical axis of the off-axis parabolic reflector.
In one embodiment, the light detector is disposed at a focal plane of the off-axis parabolic reflector and a light-sensing surface of the light detector faces the reflecting surface of the off-axis parabolic reflector.
Fig. 1 exemplarily shows that the off-axis parabolic reflector 1 is a cylinder, the longitudinal section along the optical axis direction is trapezoidal, the cross section perpendicular to the optical axis direction is circular, the off-axis angle is 90 °, and the cross section of the through hole 11 is circular;
the collimation laser 2 is embedded into one end of the through hole 11, a light outlet of the collimation laser 2 faces the through hole 11, and the optical axis of the collimation laser 2 is superposed with the optical axis of the off-axis parabolic reflector 1;
the light detector 3 is arranged on the focal plane of the off-axis parabolic reflector 1, and the light sensing surface of the light detector 3 faces the reflecting surface of the off-axis parabolic reflector 1.
The embodiment corresponding to fig. 1 provides an optical assembly of a coaxial gas telemeter including an off-axis parabolic reflector having a through hole arranged along an optical axis direction, a collimating laser and a photodetector, so that a detection laser beam emitted from the collimating laser passes through the through hole, is transmitted to an area where a gas to be detected is located along a direction parallel to the optical axis direction of the off-axis parabolic reflector, and after being reflected by a reflection point of the area where the gas to be detected is located, is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector and is reflected to the photosensitive surface of the light detector by the reflecting surface of the off-axis parabolic reflector, the detection laser beam emitted by the collimation laser and the detection laser beam reflected by the reflection point are coaxial, the optical detector can detect gas at a long distance and gas at a short distance, and the signal-to-noise ratio is high and the structure is simple.
As shown in fig. 2, in an embodiment, the optical assembly of the on-axis gas telemeter further includes a turning mirror 4 disposed on one side of the off-axis parabolic mirror 1, and a reflecting surface of the turning mirror 4 faces the light exit hole of the collimating laser 2 and the through hole 11;
the detection laser beam is reflected to the through hole 11 by the steering reflector 4, passes through the through hole 11, and is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector 1.
In application, the steering reflector can be a plane reflector, a total reflection prism or a total internal reflection prism, and the steering reflector can be arranged into a plane, a cylinder, a prism, a trapezoid body and a rectangular body according to actual needs, and specifically can be a trapezoid body. The steering mirror may be mounted directly to the off-axis parabolic mirror. The steering reflector is directly assembled on the off-axis parabolic reflector, so that the relative position relation of the steering reflector and the off-axis parabolic reflector is not influenced by external factors such as temperature change, mechanical vibration and the like, and the reliability is high. The steering reflector can also be fixed through the support, and the specific shape structure of support can set up according to actual need, can satisfy with coaxial gas telemeter optical assembly integrated fixed in integrative requirement can steadily.
Fig. 2 exemplarily shows that the off-axis parabolic reflector 1 is a cylinder, the longitudinal section along the optical axis direction is trapezoidal, the cross section perpendicular to the optical axis direction is circular, the off-axis angle is 90 °, the cross section of the through hole 11 is circular, and the steering reflector 4 is a trapezoidal body;
the collimating laser 2 and the steering reflector 4 are directly assembled at one side of the parabolic reflector 1, and the reflecting surface of the steering reflector 4 faces to a light outlet hole and a through hole 11 of the collimating laser 2;
the light detector 3 is arranged on the focal plane of the off-axis parabolic reflector 1, and the light sensing surface of the light detector 3 faces the reflecting surface of the off-axis parabolic reflector 1.
In the embodiment shown in fig. 2, the turning reflector is arranged in the optical assembly of the coaxial gas telemeter, so that the detection laser beam emitted by the collimated laser is reflected to the through hole by the turning reflector, passes through the through hole, is transmitted to the region where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected by the reflecting point of the region where the gas to be detected is located, and is reflected to the photosensitive surface of the optical detector by the reflecting surface of the off-axis parabolic reflector, so that the detection laser beam emitted by the collimated laser is coaxial with the detection laser beam reflected by the reflecting point, the optical detector can detect the gas at a long distance and the gas at a short distance, has high signal-to-noise ratio and simple structure, and the collimated laser can be arranged close to, the assembly is convenient.
As shown in fig. 3 or 4, in one embodiment, the on-axis gas telemeter optical assembly further includes a folding mirror 5 intersecting the focal plane of the off-axis parabolic mirror 1 and the reflecting surface of the folding mirror 5 faces the reflecting surface of the off-axis parabolic mirror 1 and the photosensitive surface of the photodetector 3;
after being reflected by the reflection points, the detection laser beams are transmitted to the reflection surface of the off-axis parabolic reflector 1 along the direction parallel to the optical axis of the off-axis parabolic reflector 1, are reflected to the reflection surface of the folding reflector 5 by the reflection surface of the off-axis parabolic reflector 1, and are reflected to the photosensitive surface of the optical detector 3 by the reflection surface of the folding reflector 5.
In application, the folding reflector can be a plane reflector, a total reflection prism or a total internal reflection prism, and the folding reflector can be set into a plane shape, a cylinder, a prism, a trapezoid body or a rectangular body according to actual needs, and specifically can be a plane shape. The folding reflector can also be fixed through the support, and the specific shape structure of support can set up according to actual need, can satisfy with coaxial gas telemeter optical assembly integrated fixed in integrative requirement can steadily.
FIG. 3 is a schematic diagram of the coaxial gas telemeter optical assembly exemplarily illustrated on the basis of FIG. 1, further including a folding mirror 5; the folding reflector 5 is planar, and the light detector 3 and the collimation laser 1 are positioned on the same side of the off-axis parabolic reflector 1.
In the embodiment corresponding to fig. 3, the folding reflector is arranged in the optical assembly of the coaxial gas telemeter, so that the detection laser beam emitted by the collimated laser passes through the through hole and is transmitted to the region where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, the detection laser beam is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected by the reflecting point, the detection laser beam is reflected to the reflecting surface of the folding reflector by the reflecting surface of the off-axis parabolic reflector and is reflected to the photosensitive surface of the optical detector by the reflecting surface of the folding reflector, so that the detection laser beam emitted by the collimated laser and the detection laser beam reflected by the reflecting point are coaxial, the optical detector can detect the gas at a far distance and the gas at a near distance, has high signal-to-noise ratio and simple structure, and can be arranged close to one side surface of the off-, the optical detector and the collimation laser can be arranged on the same side face of the off-axis parabolic reflector, and mechanical and circuit structure layout is facilitated.
FIG. 4 is a schematic diagram of the coaxial gas telemeter optical assembly exemplarily illustrated on the basis of FIG. 2, further including a folding mirror 5; the folding reflector 5 is planar, and the light detector 3, the collimating laser 1 and the steering reflector 4 are located on the same side of the off-axis parabolic reflector 1.
In the embodiment corresponding to fig. 4, the folding reflector is disposed in the optical assembly of the coaxial gas telemeter, so that the detection laser beam emitted by the collimated laser is reflected by the steering reflector to the through hole, passes through the through hole, and is transmitted to the region where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, and is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected by the reflection point, and is reflected to the reflecting surface of the folding reflector by the reflecting surface of the off-axis parabolic reflector, and is reflected to the photosensitive surface of the optical detector by the reflecting surface of the folding reflector, so that the detection laser beam emitted by the collimated laser is coaxial with the detection laser beam reflected by the reflection point, and the optical detector can detect both the gas at a long distance and the gas at a short distance, and has a high signal-to-, the collimating laser can be arranged close to one side face of the off-axis parabolic reflector, so that the assembly is convenient, the light detector and the collimating laser can be arranged on the same side face of the off-axis parabolic reflector, and the mechanical and circuit structure layout is convenient.
As shown in any one of fig. 5 to 8, in an embodiment, the optical assembly of the coaxial gas telemeter further includes an indication laser 6, and a light outlet of the indication laser 6 faces to a region where the gas to be detected is located, and is configured to emit a visible indication laser beam;
the visible indication laser beam is transmitted to the area where the gas to be measured is located along the direction parallel to the optical axis of the off-axis parabolic reflector 1.
In application, the indicating laser is used for emitting a visible indicating laser beam with single color or combined color in red, orange, yellow, green, cyan, blue, purple and other colors to an area where the gas to be detected is located for laser indication.
In one embodiment, the indication laser beam and the detection laser beam are parallel to each other and have a distance of 10mm to 50 mm.
In application, the indication laser is arranged on any side of the off-axis parabolic reflector, so long as the indication laser and the indication laser beam emitted by the indication laser are ensured not to be on the emitting and receiving light path of the detection laser beam, the detection laser beam is not interfered, and the receiving efficiency of the detection laser beam is not influenced. The indicator laser may be mounted directly to the off-axis parabolic mirror. The indicating laser is directly assembled on the off-axis parabolic reflector, so that the relative position relation between the indicating laser and the off-axis parabolic reflector is not influenced by external factors such as temperature change, mechanical vibration and the like, and the reliability is high. The indication laser can also be fixed through the support, and the specific shape structure of support can set up according to actual need, can satisfy with coaxial gas telemeter optical assembly integrated the requirement of being fixed in an organic whole steadily can. The indication laser beam deviates from the detection laser beam on the transmission path, but the deviation distance between the indication laser beam and the detection laser beam is small, so that the indication laser beam can be used for indicating the position of the detection laser beam emitted to the gas area to be detected, and when the detection distance is longer, the deviation distance between the indication laser beam and the detection laser beam can be ignored.
FIGS. 5-8 are schematic diagrams illustrating exemplary configurations of the coaxial gas telemetry instrument optical assembly further including an indicator laser 6, based on FIGS. 1-4, respectively; wherein the indicating laser 6 is arranged on a plane with the smallest area of the off-axis parabolic mirror 1.
In the embodiments corresponding to fig. 5 to 8, the indication laser is arranged in the optical assembly of the coaxial gas telemeter, so that the indication laser emits a visible indication laser beam which is transmitted to the region where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, the position where the detection laser beam is emitted to the region where the gas to be detected is located can be indicated, the detection position of the detection laser beam is prevented from deviating from the region where the gas to be detected is located, the precision of gas detection is improved, and more accurate concentration and component information of the gas to be detected is obtained.
As shown in any one of fig. 9 to 16, in an embodiment, the optical assembly of the coaxial gas telemeter further includes an optical filter 7, which is disposed on one side of the off-axis parabolic reflector 1 where the reflecting surface is located and perpendicular to the optical axis of the off-axis parabolic reflector 1, and configured to filter stray light except the detection laser beam emitted by the collimating laser 2 and the detection laser beam reflected by the reflecting point;
the detection laser beam penetrates through the through hole, passes through the optical filter 7, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector 1, is reflected by the reflection point, is filtered by the optical filter 7, and is transmitted to the reflection surface of the off-axis parabolic reflector 1 along the direction parallel to the optical axis of the off-axis parabolic reflector 1.
In application, according to the difference of the wavelength of the detection laser beam, the optical filter is used for transmitting the optical signal with the wavelength within the wavelength range of the detection laser beam and absorbing or reflecting other stray light signals with the wavelength outside the wavelength range of the detection laser beam, so that the interference of the other stray light signals on the detection laser beam is avoided, the optical detector can only receive and detect the optical signal with the wavelength within the wavelength range of the detection laser beam, the gas detection precision is improved, and more accurate concentration and component information of the gas to be detected is obtained. For example, when the detection laser beam is an ultraviolet laser beam, the optical filter may be an ultraviolet filter, and specifically may be an ultraviolet band-pass filter; when the detection laser beam is an infrared laser beam, the optical filter may be an infrared optical filter, and specifically, may be an infrared band-pass optical filter. The optical filter can be made by plating a plurality of dielectric films on the optical glass, and can also be made by directly adopting colored glass or colored plastic.
FIGS. 9 to 16 are schematic structural views of the coaxial gas telemeter optical module further including an optical filter 7, respectively, as exemplified on the basis of FIGS. 1 to 8.
In the embodiments corresponding to fig. 9 to 16, the optical filter is disposed in the optical component of the coaxial gas telemeter, so that the detection laser beam passes through the through hole, passes through the optical filter, and then is transmitted to the region where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is reflected by the reflection point, is filtered by the optical filter, and then is transmitted to the reflection surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector, thereby avoiding interference of other stray light signals with wavelengths outside the wavelength range of the detection laser beam on the detection laser beam, improving the precision of gas detection, and obtaining more accurate concentration and component information of the gas to be detected.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An optical assembly for a coaxial gas telemeter, comprising:
an off-axis parabolic reflector having a through hole disposed along the optical axis;
the collimation laser is arranged on one side of the off-axis parabolic reflector and is used for emitting a detection laser beam;
a light detector for receiving and detecting the detection laser beam;
the detection laser beam penetrates through the through hole, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is reflected by the reflection point of the area where the gas to be detected is located, is transmitted to the reflection surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector, and is reflected to the photosensitive surface of the optical detector through the reflection surface of the off-axis parabolic reflector.
2. The on-axis gas telemetry instrument optical assembly of claim 1, wherein the light exit aperture of the collimated laser is oriented toward the through hole and the optical axis of the collimated laser coincides with the optical axis of the off-axis parabolic reflector.
3. The on-axis gas telemeter optical assembly of claim 1, wherein the light detector is disposed at a focal plane of the off-axis parabolic mirror and a light-sensitive surface of the light detector faces a reflective surface of the off-axis parabolic mirror.
4. The on-axis gas telemeter optical assembly of claim 1, further comprising a turning mirror disposed on one side of the off-axis parabolic mirror, the turning mirror having a reflecting surface facing the exit aperture of the collimating laser and the through hole;
and the detection laser beam penetrates through the through hole and is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected to the through hole by the steering reflector.
5. The on-axis gas telemeter optical assembly of claim 1, further comprising a folding mirror intersecting the focal plane of the off-axis parabolic mirror with a reflective surface of the folding mirror facing the reflective surface of the off-axis parabolic mirror and the photosensitive surface of the photodetector;
the detection laser beam is transmitted to the reflecting surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector after being reflected by the reflecting point, is reflected to the reflecting surface of the folding reflector by the reflecting surface of the off-axis parabolic reflector, and is reflected to the photosensitive surface of the optical detector by the reflecting surface of the folding reflector.
6. The optical assembly of any one of claims 1-5, further comprising an indicator laser having a light exit hole facing the area of the gas to be measured for emitting a visible indicator laser beam;
and the visible indication laser beam is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector.
7. The optical assembly of any one of claims 1-5, further comprising an optical filter disposed on a side of the off-axis parabolic reflector where the reflecting surface is located and perpendicular to the optical axis of the off-axis parabolic reflector for filtering stray light from the detection laser beam emitted by the collimating laser and the detection laser beam reflected back by the reflecting point;
the detection laser beam penetrates through the through hole, passes through the optical filter, is transmitted to the area where the gas to be detected is located along the direction parallel to the optical axis of the off-axis parabolic reflector, is reflected by the reflection point, is filtered by the optical filter, and is transmitted to the reflection surface of the off-axis parabolic reflector along the direction parallel to the optical axis of the off-axis parabolic reflector.
8. An on-axis gas telemeter optical assembly according to any of claims 1 to 5, wherein the off-axis angle of the off-axis parabolic mirror is in the range 30 ° to 120 °.
9. The coaxial gas telemeter optical assembly of any of claims 1 to 5, wherein the photodetector comprises a photodiode chip.
10. The coaxial gas telemeter optical assembly of claim 9, wherein the photodiode chip has a diameter in the range of 0.1mm to 0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200235.4A CN110763629A (en) | 2019-11-29 | 2019-11-29 | Coaxial gas telemeter optical assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911200235.4A CN110763629A (en) | 2019-11-29 | 2019-11-29 | Coaxial gas telemeter optical assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110763629A true CN110763629A (en) | 2020-02-07 |
Family
ID=69340711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911200235.4A Pending CN110763629A (en) | 2019-11-29 | 2019-11-29 | Coaxial gas telemeter optical assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110763629A (en) |
-
2019
- 2019-11-29 CN CN201911200235.4A patent/CN110763629A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108931504B (en) | Annular multipoint reflection type photoelectric body sensor probe | |
| KR101507474B1 (en) | Spectrometry device for fluid analysis | |
| GB2583023A (en) | A gas sensor probe and a detection apparatus based on spiral light path with multiple-point reflection | |
| US6753967B2 (en) | Gas sensor | |
| CN104122223A (en) | Double-optical-path multi-gas infrared sensor | |
| US9207170B2 (en) | Gas detector system | |
| US8399839B2 (en) | Infrared optical gas-measuring device | |
| CN103822910A (en) | Raman probes for miniature Raman spectrometer | |
| KR102644216B1 (en) | Apparatus for sensing particle | |
| WO2010058322A1 (en) | Laser self-mixing differential doppler velocimetry and vibrometry | |
| CN110632008B (en) | Multipoint reflection type photoelectric body sensor probe and photoelectric gas detection device | |
| CN110637225A (en) | Optical sensor | |
| CN211292546U (en) | Coaxial gas telemeter optical assembly | |
| US7346087B2 (en) | Method for performing eye safety measurements on laser emitter devices | |
| CN110763629A (en) | Coaxial gas telemeter optical assembly | |
| CN217466653U (en) | Miniature gas absorption cell of long light path | |
| EP3290907A1 (en) | Device for measuring solution concentration | |
| KR101535209B1 (en) | Self-aligned spectrometer | |
| CN106092963A (en) | The laser methane concentration monitoring device of multi-angle fast tunable | |
| KR102223821B1 (en) | Multi gas sensing apparatus | |
| WO2019021694A1 (en) | Optical separator structure and substance concentration measurement device | |
| JPH05107100A (en) | Method and device for detecting interface | |
| CN114486823A (en) | Optical path system and handheld device for lateral immunochromatography instrument | |
| EP3674674A1 (en) | Flame detector | |
| CN217466652U (en) | Miniature gas absorption cell of long light path |
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 | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 221000 No. 99 Xu Hai Road, Xuzhou economic and Technological Development Zone, Xuzhou, Jiangsu Applicant after: Jiangsu Xuhai Photoelectric Technology Co.,Ltd. Address before: 221000 room 208, Clean Technology Industrial Park Service Center, Xuzhou Economic and Technological Development Zone, Jiangsu Province Applicant before: XUZHOU XUHAI OPTO-ELECTRONIC TECHNOLOGIES Co.,Ltd. |