CN104501908A - Photoelectric sensor detecting liquid level - Google Patents
Photoelectric sensor detecting liquid level Download PDFInfo
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- CN104501908A CN104501908A CN201410795826.1A CN201410795826A CN104501908A CN 104501908 A CN104501908 A CN 104501908A CN 201410795826 A CN201410795826 A CN 201410795826A CN 104501908 A CN104501908 A CN 104501908A
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- China
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- glass prism
- photoelectric sensor
- liquid level
- digital voltmeter
- light source
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Abstract
The invention discloses a photoelectric sensor detecting liquid level. The photoelectric sensor is characterized by comprising a light source (1), a transmission fiber (2), a right triangular glass prism (3), a receiving fiber (4), a photoelectric detector (5), a digital voltmeter (6), a fixed frame (7), a liquid pool (8) and fixing screws (9); the transmission fiber (2) is connected with the light source (1) and the right triangular glass prism (3) respectively; the right triangular glass prism (3) is fixed on the fixed frame (7) through the fixing screws (9); the receiving fiber (4) is connected to the right triangular glass prism (3) and the digital voltmeter (6) respectively; the digital voltmeter (6) is connected with the photoelectric detector (5), and the liquid pool (8) is filled with sensing medium. The photoelectric sensor is high in precision, recyclable, capable of detecting liquid level changes of any clean liquids, extracting clean petroleum and examining water-like solvent proportion, simple in structure, easy to operate and applicable to various actual programs.
Description
Technical field
The invention provides a kind of photoelectric sensor detecting liquid level, belong to photoelectric detection technology field.
Background technology
Along with the raising of modern science and technology and complex automatic control system and information processing and technology, photoelectric detecting technology, as the new branch of science that grows up of research light-matter interaction, has become the ingredient that of Modern information science is very important.Photoelectric Detection is as one of the major technique of optoelectronic information technology, it is based on the modern optoelectronic devices such as laser, infrared, optical fiber, by the optical radiation to object to be detected, accept optical radiation through photoelectric detector and be converted to the application of technology always of electric signal.It is low that technique has cost, and antijamming capability is strong, and detection speed is fast, the superiority that measuring accuracy is high, is the Main way of detection technique development.
Summary of the invention
The object of the present invention is to provide a kind of photoelectric sensor detecting liquid level.This device can measure the change of liquid level under what connection clean liquid in office, also may be used for refining clean oil, and some solvent proportions as water check.Have high precision, high repeatable, cost is low, can remote sensing, installs simple feature.
The present invention is achieved through the following technical solutions:
The invention provides a kind of photoelectric sensor detecting liquid level, it is characterized in that: be made up of light source (1), Transmission Fibers (2), right-angle triangle glass prism (3), reception optical fiber (4), photodetector (5), digital voltmeter (6), fixed support (7), liquid cell (8) and fixed screw (9); Transmission Fibers (2) is connected with right-angle triangle glass prism (3) with light source (1) respectively, right-angle triangle glass prism (3) fixed screw (9) is fixed on fixed support (7), receiving optical fiber (4) is connected on right-angle triangle glass prism (3) and digital voltmeter (6) respectively, digital voltmeter (6) is connected with photodetector (5), and liquid cell is full of sensor information in (8).The present invention has high precision, repeatable, and can measure the change of water level under what connection clean liquid in office, also may be used for refining clean oil, and the solvent proportion as some water checks, structure is simple, is easy to operation, can be applied in all kinds of Practical Project.
Principle of work of the present invention is: photo-current intensity by the photo-current intensity of Photoelectrical detector is:
I(φ，n)＝P
0ηT(φ，n) (1)
Wherein T is the clean transmission function of sensor, and φ is incident angle, and n is relative index of refraction, P
0be the light source power of photodetector (5) incident light as T=1, the response wave length of unit to be W, η be photodetector (5), unit is A/W.
If so we suppose that the initial intensity of light source is I
0, the projection intensity so on point 1 is TI
0, are TRI in the light intensity of point 2
0, are TR in the light intensity of point 3
2i
0, the intensity finally obtaining a little 4 is exactly:
I
4＝T
2R
2I
0(2)
The mean value R of nonpolarized light can be write as:
Wherein n is liquid/glass ratio, and F is the incident angle at glass and liquid, is 45 degree here, the reflectivity R of the Section 1 display in bracket
s(S polarized electromagnetic beam), Section 2 represents R
p(p polarized electromagnetic beam), reflectivity R is the function of liquid refractivity.
Refraction angle in water is approximately 52.91 degree, increase liquid refractivity to 1.45 time, refraction angle is reduced to 47.03 degree.Disappear than being obtained namely by the reflectivity ratio of consideration partial internal reflection to total internal reflection:
If R < 1, so R square much smaller than 1, disappear than being very little so theoretical.
The invention has the beneficial effects as follows: this sensor may be used for liquid level induction, level switch, refractometry, make this installation cost low based on above character, install simple, handled easily.
Accompanying drawing explanation
Fig. 1 is the photoelectric sensor characterizing arrangement schematic diagram of detection liquid level of the present invention;
Fig. 2 is that polarization (s, p) and nonpolarized light change the impact for liquid refractivity at the reflectivity R of liquid-gas interface.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
See accompanying drawing 1, detect the photoelectric sensor of liquid level: it is characterized in that: the invention provides a kind of Fibre Optical Sensor detecting liquid level, it is characterized in that: be made up of light source (1), Transmission Fibers (2), right-angle triangle glass prism (3), reception optical fiber (4), photodetector (5), digital voltmeter (6), fixed support (7), liquid cell (8) and fixed screw (9); Transmission Fibers (2) is connected with right-angle triangle glass prism (3) with light source (1) respectively, right-angle triangle glass prism (3) fixed screw (9) is fixed on fixed support (7), receiving optical fiber (4) is connected on right-angle triangle glass prism (3) and digital voltmeter (6) respectively, digital voltmeter (6) is connected with photodetector (5), and liquid cell is full of sensor information in (8).
As shown in Figure 2, polarized light and nonpolarized light have certain influence in the reflectivity R change of liquid-gas interface for liquid refractivity.The maximal value of R is the inner full-reflection of glass-air, and it equals 1.If increase the refractive index of adjacent material (liquid), this reflectivity reduces.Such as, be about 0.0096 with the water index of 1.33 (refraction) reflectivity.For the value that refractive index is higher, this factor reduces greatly, and refractive index is 1.45, then reflectivity is only 0.0006.
Claims (1)
1. detect a photoelectric sensor for liquid level, it is characterized in that: be made up of light source (1), Transmission Fibers (2), right-angle triangle glass prism (3), reception optical fiber (4), photodetector (5), digital voltmeter (6), fixed support (7), liquid cell (8) and fixed screw (9); Transmission Fibers (2) is connected with right-angle triangle glass prism (3) with light source (1) respectively, right-angle triangle glass prism (3) fixed screw (9) is fixed on fixed support (7), receiving optical fiber (4) is connected on right-angle triangle glass prism (3) and digital voltmeter (6) respectively, digital voltmeter (6) is connected with photodetector (5), and liquid cell is full of sensor information in (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410795826.1A CN104501908A (en) | 2014-12-19 | 2014-12-19 | Photoelectric sensor detecting liquid level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410795826.1A CN104501908A (en) | 2014-12-19 | 2014-12-19 | Photoelectric sensor detecting liquid level |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104501908A true CN104501908A (en) | 2015-04-08 |
Family
ID=52943333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410795826.1A Pending CN104501908A (en) | 2014-12-19 | 2014-12-19 | Photoelectric sensor detecting liquid level |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104501908A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108355531A (en) * | 2018-03-16 | 2018-08-03 | 溢通环保科技（莆田）有限公司 | A kind of urea for vehicle solution-preparation device |
| CN108479490A (en) * | 2018-03-16 | 2018-09-04 | 溢通环保科技（莆田）有限公司 | A kind of urea for vehicle solution production control method |
| WO2020243959A1 (en) * | 2019-06-06 | 2020-12-10 | Vincent Medical (Dong Guan) Manufacturing Co., Ltd. | An improved liquid reservoir for a humidifier, a medical device containing, a humidifier containing, and a method therefor |
| CN112987119A (en) * | 2019-12-16 | 2021-06-18 | 安德烈·斯蒂尔股份两合公司 | Optical working liquid detector for optically detecting a working liquid and handheld gardening, forestry and/or construction processing device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108905U (en) * | 1991-11-08 | 1992-07-01 | 南京航空学院 | Optical fiber liqud level sensor |
| CN202350870U (en) * | 2011-12-08 | 2012-07-25 | 飞秒光电科技(西安)有限公司 | Water inlet automatic detecting device of outdoor machine cabinet |
| CN204313929U (en) * | 2014-12-19 | 2015-05-06 | 中国计量学院 | A kind of photoelectric sensor detecting liquid level |
-
2014
- 2014-12-19 CN CN201410795826.1A patent/CN104501908A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108905U (en) * | 1991-11-08 | 1992-07-01 | 南京航空学院 | Optical fiber liqud level sensor |
| CN202350870U (en) * | 2011-12-08 | 2012-07-25 | 飞秒光电科技(西安)有限公司 | Water inlet automatic detecting device of outdoor machine cabinet |
| CN204313929U (en) * | 2014-12-19 | 2015-05-06 | 中国计量学院 | A kind of photoelectric sensor detecting liquid level |
Non-Patent Citations (1)
| Title |
|---|
| 张玉 等: "光纤传感器在液位检测中的应用", 《传感器与微系统》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108355531A (en) * | 2018-03-16 | 2018-08-03 | 溢通环保科技（莆田）有限公司 | A kind of urea for vehicle solution-preparation device |
| CN108479490A (en) * | 2018-03-16 | 2018-09-04 | 溢通环保科技（莆田）有限公司 | A kind of urea for vehicle solution production control method |
| WO2020243959A1 (en) * | 2019-06-06 | 2020-12-10 | Vincent Medical (Dong Guan) Manufacturing Co., Ltd. | An improved liquid reservoir for a humidifier, a medical device containing, a humidifier containing, and a method therefor |
| CN112987119A (en) * | 2019-12-16 | 2021-06-18 | 安德烈·斯蒂尔股份两合公司 | Optical working liquid detector for optically detecting a working liquid and handheld gardening, forestry and/or construction processing device |
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Application publication date: 20150408 |
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