CN2138298Y - Single optic fibre concentration sensor - Google Patents
Single optic fibre concentration sensor Download PDFInfo
- Publication number
- CN2138298Y CN2138298Y CN 92232787 CN92232787U CN2138298Y CN 2138298 Y CN2138298 Y CN 2138298Y CN 92232787 CN92232787 CN 92232787 CN 92232787 U CN92232787 U CN 92232787U CN 2138298 Y CN2138298 Y CN 2138298Y
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- light
- single fiber
- sensor
- sensitive area
- concentration sensor
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Abstract
The utility model relates to a single optic fiber concentration sensor, which belongs to the technical field of measuring the concentration or density of liquid or gas. The concentration sensor comprises an optical prism with a sensitive face, a reflecting face and a transparent bottom face, a self-focusing lens connected through single fiber, an optical coupler, a light emitting tube and a light receiving tube. The single optic fiber concentration sensor lets the light rays twice refracted by changing double light paths into single light path; the sensitivity and the reliability of concentration measurement are enhanced. The single optic fiber concentration sensor has the advantages of convenient manufacture, assembly and use, etc.; the single optic fiber concentration sensor can be used in related departments in national economy.
Description
The utility model belongs to the field of measuring concentration of fluid or density, particularly belongs to the field that utilizes single fiber to measure liquid or gas concentration or density.
In chemical industry, oil, light industry, food, medicine, health, environmental protection, geology, metallurgy, agricultural, scientific research and people's lives, often need carry out quantitative detection to liquid or gas concentration or density.Particularly along with the automatic control technology application and development, press for and adopt highly sensitive, dependable performance, be convenient to the measurement of concetration sensor making and use more.
The present inventor once proposed a kind of concentration sensor in I previous utility model patent CN 90211593.6 " liquid concentration testing sensor ".But this concentration sensor luminous and to be subjected to light be two independently light paths, is not easy to produce in batches at complex structure, processing technology trouble, assembly production difficulty, and also has some problems aspect reliability.
Therefore, the purpose of this utility model just is above-mentioned prior art is improved, provide a kind of have only a light path, handling ease, assembly production easy, be convenient to produce in batches, stable more, concentration sensor reliably.
For this reason, the concentration sensor of single fiber that utilizes of the present utility model comprises:
An optical prism, its refractive index is greater than the maximal value of measured medium variations in refractive index, this prism comprise a plated film or not plated film sensitive area, one the plating reflection enhancing coating reflecting surface, and the printing opacity bottom surface of a plating anti-reflection film, sensitive area and bottom surface angulation are wanted to make the incident angle of incident ray on sensitive area approach the angle of total reflection, and it is vertical incidence that sensitive area and reflecting surface angulation are wanted to make the light that incides on the reflecting surface;
The GRIN Lens that and end vertical with the bottom surface and bottom surface join;
One first single fiber, its end and the other end of GRIN Lens join;
" Y " type photo-coupler has one " closing end " and two " dividing end ", and the other end of its " the closing end " and first single fiber joins;
One second single fiber, join to first " dividing end " of its end and photo-coupler;
A luminotron, the other end of its light output end and second single fiber joins;
A light-receiving tube, join to second " dividing end " of its light input end and photo-coupler, and its electric output terminal uses for primary instrument; And the pedestal and the shell of a said prism of encapsulation all parts and GRIN Lens except that sensitive area.
Most preferred embodiment by concentration sensor of the present utility model:
A. said prism is what ground by optical glass or gem crystal;
B. said luminotron is that wavelength is the LED of 0.86 μ m;
C. said light-receiving tube is PIN type photodiode, photoelectric cell or photoelectric tube;
D. said single fiber is that core diameter is the quartzy telecommunications fibers of 50/125 μ m;
E. said single fiber is the multimode optical fiber of big core diameter, large-numerical aperture;
F. said single fiber is a plastic optical fiber.
Describe concentration sensor of the present utility model in detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is the general structure synoptic diagram that utilizes the concentration sensor embodiment of single fiber of the present utility model;
Fig. 2 is the optical prism synoptic diagram of concentration sensor shown in Figure 1.
At first with reference to Fig. 1.As shown in Figure 1, this concentration sensor comprises: prism 1, GRIN Lens 4, optical fiber directional coupler 5, optical fiber 6,6 ', light-receiving tube 8, pedestal and shell 9; Prism 1 mainly comprises reflecting surface 2, sensitive area 3 and printing opacity bottom surface 10, referring to Fig. 2.10 one-tenth α angles of sensitive area 3 and bottom surface; 2 one-tenth β angles of sensitive area 3 and reflecting surface.The size at α angle is wanted to make the incident angle of incident light on sensitive area 3 approach the angle of total reflection (for measured medium); The size at β angle is wanted to make that the light that incides on the reflecting surface 2 is vertical incidence, so that guarantee that reflected light returns along original optical path.
Prism 1 can be ground by optical glass or gem crystal and form, and its refractive index should be greater than the maximal value of measurand variations in refractive index.The temperature coefficient of prism 1, indexs such as acid-alkali-corrosive-resisting, hardness are decided on different test conditions.
GRIN Lens 4 is perpendicular to the bottom surface 10 of prism 1, and links to each other with optical fiber 6.It is the LED of 0.86 μ m that luminotron 7 can adopt wavelength.Light-receiving tube 8 can adopt PIN type photodiode, photoelectric cell or the photoelectric tube to 0.86 mum wavelength sensitivity.It is the quartzy communication optical fiber of 50/125 μ m that optical fiber 6 can adopt core diameter, also can adopt the big core diameter that sensing uses, the multimode optical fiber of large-numerical aperture, perhaps adopts low-cost plastic optical fiber.Directional coupler 5 can be selected for use with the identical optical fiber of optical fiber (6) and make.Directional coupler 5 is made " Y " type, and its " closing end " 11 links to each other with self-aggregation lens 4 by optical fiber 6; Its one " divide end " 12 and light source (luminotron 7) join; Another " divides end " 13 links to each other with light-receiving tube 8.Therefore, directional coupler 5 can send luminotron 7 couples light to GRIN Lens 4, can will couple light to light-receiving tube 8 from GRIN Lens 4 again.Pedestal and shell 9 can be made with stainless steel, copper, aluminium or special plastics, and entire mechanism should prevent that liquid leaks, and only exposes sensitive area 3.
According to structure shown in Figure 1, the light that sends by luminotron 7 through single fiber 6 ', " dividing end " 12 of " Y " type photo-coupler 5 enters photo-coupler 5, then leave " closing end " 11 of coupling mechanism 5,, incide prism 1 with nearly directional light light beam again through optical fiber 6 and GRIN Lens 4.This light beam passes the printing opacity bottom surface 10 of prism 1 and arrives at sensitive area 3; α angle between sensitive area 3 and the bottom surface 10 can be incided on the interface of prism sensitive area 3 and measured medium this light beam with the angle near the angle of total reflection, to improve the sensitivity of measuring.This light beam incides on the reflecting surface 2 subsequently again; Determine the β angle between sensitive area 3 and the reflecting surface, making the light that incides on the reflecting surface 2 is vertical incidence.Because vertical incidence makes the light of this vertical incidence return sensitive area 3 by the former road of incident direction, reflection for the second time takes place on the interface between sensitive area 3 and measured medium and return GRIN Lens 4 according to input path.This light beam then enters photo-coupler 5 via optical fiber 6, leaves second " dividing end " 13 of photo-coupler 5 and arrives at light-receiving tube 8.The light that light-receiving tube 8 interfaces of acceptance through between sensitive area 3 and measured medium reflect for twice also converts thereof into electric signal output, and according to the Fresnel in the optics (Fresnell) formula, catoptrical luminous power changes according to the variations in refractive index of measured medium.Therefore the change in electric of light-receiving tube 8 outputs has promptly been represented the concentration change of measured medium.
Owing to experience two secondary reflections at the interface of sensitive area 3 and measured medium glazed thread, therefore the optical power change that is produced is bigger, thereby has improved the sensitivity of measuring.Incident beam is to incide on the sensitive area 3 with the angle that is bordering on the angle of total reflection, also is in order to improve measurement sensitivity.According to aforementioned arrangement of the present utility model, incident, two light paths of reflection are combined into a light path, so this sensor also has handling ease, advantage such as assembly production is easy, be convenient to produce in batches, more reliable and more stable.
Claims (7)
1, a kind of concentration sensor that utilizes single fiber is characterized in that it comprises:
An optical prism, its refractive index is greater than the maximal value of measured medium variations in refractive index, said prism comprises a plated film or the printing opacity bottom surface of sensitive area, a plating reflecting surface of reflection enhancing coating and a plating anti-reflection film of plated film not, said sensitive area and said bottom surface angulation are wanted to make the incident angle of incident ray on said sensitive area approach the angle of total reflection, and it is vertical incidence that said sensitive area and said reflecting surface angulation are wanted to make the light that incides on the said reflecting surface;
The GRIN Lens that an and end vertical with said bottom surface and said bottom surface join;
One first single fiber, its end and the other end of said GRIN Lens join;
The photo-coupler of " Y " type has one " closing end " and two " dividing end ", and " closing end " of said photo-coupler joined with the other end of said first single fiber;
One second single fiber, join to first " dividing end " of its end and said photo-coupler;
A luminotron, the other end of its light output end and said second single fiber joins;
A light-receiving tube, join to second " dividing end " of its light input end and said photo-coupler, and its electric output terminal uses for primary instrument; And
The pedestal and the shell of a said prism of encapsulation all parts and GRIN Lens except that sensitive area.
2, a kind of sensor as claimed in claim 1 is characterized in that wherein said prism is what ground by optical glass or gem crystal.
3, a kind of sensor as claimed in claim 1 or 2 is characterized in that wherein said luminotron is that wavelength is the LED of 0.86 μ m.
4, a kind of sensor as claimed in claim 1 or 2 is characterized in that wherein said light-receiving tube is PIN type photodiode, photoelectric cell or photoelectric tube.
5, a kind of sensor as claimed in claim 1 or 2 is characterized in that wherein said single fiber is that core diameter is the quartzy communication optical fiber of 50/125 μ m.
6, a kind of sensor as claimed in claim 1 or 2 is characterized in that wherein said single fiber is the multimode optical fiber of big core diameter, large-numerical aperture.
7, a kind of sensor as claimed in claim 1 or 2 is characterized in that wherein said single fiber is a plastic optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92232787 CN2138298Y (en) | 1992-09-12 | 1992-09-12 | Single optic fibre concentration sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92232787 CN2138298Y (en) | 1992-09-12 | 1992-09-12 | Single optic fibre concentration sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2138298Y true CN2138298Y (en) | 1993-07-14 |
Family
ID=33775259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92232787 Expired - Lifetime CN2138298Y (en) | 1992-09-12 | 1992-09-12 | Single optic fibre concentration sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2138298Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846577A (en) * | 2010-06-18 | 2010-09-29 | 珠海保税区光联通讯技术有限公司 | Passive optical fiber sensor and optical fiber detection system |
| CN102495028A (en) * | 2011-11-18 | 2012-06-13 | 江苏大学 | Mixing concentration on-line detection method and device thereof |
| CN104729958A (en) * | 2015-03-19 | 2015-06-24 | 杭州电子科技大学 | Optical fiber microsensor and detection system for in-situ detecting biological film density distribution |
-
1992
- 1992-09-12 CN CN 92232787 patent/CN2138298Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846577A (en) * | 2010-06-18 | 2010-09-29 | 珠海保税区光联通讯技术有限公司 | Passive optical fiber sensor and optical fiber detection system |
| CN102495028A (en) * | 2011-11-18 | 2012-06-13 | 江苏大学 | Mixing concentration on-line detection method and device thereof |
| CN102495028B (en) * | 2011-11-18 | 2013-10-23 | 江苏大学 | Mixing concentration on-line detection method and device thereof |
| CN104729958A (en) * | 2015-03-19 | 2015-06-24 | 杭州电子科技大学 | Optical fiber microsensor and detection system for in-situ detecting biological film density distribution |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |