CN1023730C - Liquid-core optical fiber sensor with changeable length of light transmission - Google Patents
Liquid-core optical fiber sensor with changeable length of light transmission Download PDFInfo
- Publication number
- CN1023730C CN1023730C CN 90108107 CN90108107A CN1023730C CN 1023730 C CN1023730 C CN 1023730C CN 90108107 CN90108107 CN 90108107 CN 90108107 A CN90108107 A CN 90108107A CN 1023730 C CN1023730 C CN 1023730C
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- liquid
- optical fiber
- core optical
- tubule
- light
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- Measuring Temperature Or Quantity Of Heat (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention belongs to a liquid-core optical fiber sensor for measuring and giving an alarm. Liquid in the liquid-core optical fiber of the present invention is not filled in a thin pipe (namely a hollow optical fiber); consequently, the light transmission length of the liquid-core optical fiber can change when environment changes. The liquid-core optical fiber sensor measures and gives an alarm at environment temperature, pressure, displacement, electric fields, magnetic fields, gas, etc. after being scaled. The present invention has the advantages of simple structure, easy checkout, little disturbing influence, stable and accurate measurement, etc., and is suitable for industrial and agricultural detection departments, instrument departments, environment detection departments, medical treatment and sanitation departments, etc.
Description
The invention belongs to a kind of liquid-core optical fiber sensor of measuring and reporting to the police of being used to.
Be used for the Fibre Optical Sensor of physical quantities such as temperature, pressure, displacement, speed, electric field, magnetic field, normally the change by each physical quantity can cause what the change of Optical Fiber Transmission feature was carried out.Analogy, fibre optic temperature sensor are to utilize the change of environment temperature and cause that the size of optical fiber core diameter or refractive index change, and make the variation of local characteristics light intensity, phase place, plane of polarization etc. of light transmission fiber, carry out the measurement of temperature.With the present invention near and more typical prior art can be referring to " ELECTRONICS LETTRES " 17th February 1983.Vol.19, the 133rd page of No.4, " LIQUID-COREOPTICAL FIBER FOR VOLTAGE MEASURMENT USING KERR EFFECT ".Principle and the device of electric field being measured with liquid-core optical fibre introduced in this piece article.This liquid-core optical fibre is liquid to be full of tubule (being hollow-core fiber) make.Measurement is to use the Ke Er effect, records the numerical value of voltage by the deflection angle that detects polarized light.Existing Fibre Optical Sensor has shortcomings such as signal is weak, apparatus structure is complicated, detection inconvenience.
The present invention utilizes brand-new thought, design simple in structure, detect easily, can both measure and the liquid-core optical fiber sensor of the biography light length variations that can be used to report to the police multiple physical quantity.
(be to fill in the hollow optic fibre, constitute liquid-core optical fibre at tubules such as the glass of transmitted light (electromagnetic wave), quartz, plastics with the liquid of refractive index greater than the tubule refractive index.Liquid-core optical fibre of the present invention, liquid are not full of tubule, promptly are filled into the interior liquid volume of tubule less than the tubule internal volume; Perfusion fluid is to be undertaken by special end socket, the end sealing of perfusion back optical fiber, and the other end then can be an opening, rear enclosed also can be evacuated; The tubule internal diameter is even, is generally φ 7-300 μ m; The internal-filling liquid body can be bromobenzene, benzene, chlorobenzene, carbon disulphide etc.When the end that liquid is housed at liquid-core optical fibre shone with incident light, then the other end of fluid column had emergent light in liquid-core optical fibre.When external environmental condition changes, the length of fluid column will change, and pass the liquid difference of light in the tubule, and the change that passes light length is also different.In order to measure or to report to the police, to calibrate and scale at different measuring objects liquid-core optical fiber sensor of the present invention in advance, then can correspondingly measure temperature, pressure, displacement, vibration, speed, gas content, electric field, magnetic field equivalent or the quantitatively warning of environment.
Fig. 1 is for passing the liquid-core optical fiber sensor synoptic diagram of light length variations.Among Fig. 1,1 is tubule, and 2 is liquid, and 3 is end socket.End socket is exactly the blind end of tubule 1.According to measuring or warning object difference, end socket place or whole liquid-core optical fibre scribble different sensitive coatings.Tubule 1, fluid, end socket 3 constitute the liquid-core optical fibre that passes the light length variations.Among Fig. 1,4 be incident light, 5 is emergent light, 6 is detection system.Detection system 6 comprises the device that receives emergent light 5, as photoelectric tube, silicon photocell etc., comprise counting assembly, as rule, charactron counter etc., comprise that also light signal is converted into electric signal, carry out the warning of modes such as sound, light, automatic control or the device that eliminates danger.
Enumerate below that several concrete being used to are measured and the embodiment of the liquid-core optical fiber sensor of the biography light length variations of reporting to the police:
1, thermometric and temperature warning sensor
Perfusion transparency liquid in tubule 1, two ends are sealing.To different temperature measurement accuracy requirements, the internal diameter of tubule 1 can have different selections.
This thermometer can also can be calibrated with higher thermometer (as 0.1 ℃) with high-precision temperature meter (as fibre optic thermometer etc.) calibration.Count with the groove mode, temperature is measured.Because the change of 0.1 ℃ of biography light length L that causes of the every variation of temperature is more many greatly than the length of the thermometer fluid column change of calibration usefulness, and because tubule 1 internal diameter is even, under normal pressure, the rising that passes the increase of light length and ambient temperature at certain temperature range liquid 2 is proportional, thereby after the calibration, the variable quantity △ L etc. that again environment temperature is changed 0.1 ℃ of biography light length that causes divides 10 parts, even more parts, thereby can measure 0.01 ℃ variation, improve temperature measurement accuracy.
Except counting with the groove mode, can also be installed with photoelectric tube side by side in the liquid-core optical fibre side, light length increases and the rising of ambient temperature is proportional because liquid 2 passes, thereby photoelectric tube should be evenly distributed, changes the electric signal counting behind the emergent light 5 by photoelectric tube reception liquid-core optical fibre into.Can also receive emergent light 5 with silicon photocell, when temperature change, the biography light length of liquid changes, thereby changes the distance of emergent light 5 to silicon photocell, owing to silicon photocell receives the different height that demonstrate temperature of light intensity.
This thermometer can be used for the measurement of temperature field, object, health equitemperature, in the time of also can working as temperature variation and arrive to a certain degree, by electric signal warning horn is given the alarm.
2, pressure, displacement, vibration survey and alarm sensor
Liquid-core optical fibre of the present invention is by end socket 3, fill into certain amount of fluid, other end opening or sealing, end socket 3 is with making such as the plastics of different hardness or rubber, and bigger volume is arranged, when being subjected to certain pressure, can cause the change (increase) of liquid volume in the tubule 1, thereby cause the change that passes light length, the calibration with aforementioned 1, method of counting can be measured situations such as external pressure, displacement, vibration.When pressure, displacement, when vibration reaches certain limit, pass through alarm equipment alarm.
3, gas, electric field, magnetic-field measurement and alarm sensor
On the end socket 3 and tubule 1 of liquid-core optical fibre of the present invention, coating the influential various materials of different amount of substances is different sensitive coatings, the variation of varying degree physics or chemical property can take place in this material under effects such as gas, electric field, magnetic field, as produce heat, expansion etc., thereby cause that liquid-core optical fibre passes the variation of light length, measure the change that passes light length, indirectly gas, electric field, magnetic field are measured and reported to the police.
Such as to hydrogen measurement.Tubule 1 and end socket 3 places at liquid-core optical fibre scribble Metal Palladium.Hydrogen and palladium reaction generate hydride.The molecular structure of hydride is bigger than palladium, and when reaction generated hydride, amounts of hydrogen was big more, and the stress that tubule 1 and end socket 3 produce is big more, therefore, can cause that when hydrogen exists the liquid-core optical fibre volume becomes big, and then the biography light length of liquid core is changed.As long as tubule 1 internal diameter is even, the change of liquid-core optical fibre volume is directly proportional with the size of amounts of hydrogen, measures variable quantity, can measure or reports to the police the size of amounts of hydrogen through calibrating.
Suppose magnetic-field measurement again.Scribble on liquid-core optical fibre the tangible metallic nickel of magnetic field reaction, under the action of a magnetic field, the length of nickel changes thereby make optical fiber pass light length because magnetostriction changes, and can measure or reports to the police magnetic field through calibration.
The liquid-core optical fiber sensor of biography light length variations of the present invention and other Fibre Optical Sensors relatively, the main distinction is to use geometrical length that liquid-core optical fibre passes light and changes with external environment and measure and report to the police. Thereby accurately interference is little, simple in structure to have Measurement sensibility, detects the advantages such as easy. Be suitable for industrial or agricultural detection, instrument and meter, environment measuring, the departments such as health care use.
Claims (3)
1, a kind of by the uniform tubule 1 of internal diameter, be fed into the liquid 2 in the tubule 1, the refractive index of 2 pairs of light of this liquid is greater than the refractive index of tubule 1, and the liquid Fibre Optical Sensor of the biography light length variations that constitutes such as end socket 3, pick-up unit 6, it is characterized in that liquid 2 is not full of tubule 1, the volume that promptly is filled into the fluid 2 in the tubule 1 is less than the volume in the tubule 1; Perfusion fluid 2 is undertaken by end socket 3, and the optical fiber after the perfusion seals at an end of end socket 3, and the other end is an opening, or the rear enclosed that is evacuated.
2, according to the liquid-core optical fiber sensor of the described biography light of claim 1 length variations, it is characterized in that scribbling Metal Palladium at tubule 1 and end socket 3 places, be used to measure amounts of hydrogen.
3, according to the liquid-core optical fiber sensor of the described biography light of claim 1 length variations, it is characterized in that on liquid optical fiber, scribbling metallic nickel, be used for magnetic field is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108107 CN1023730C (en) | 1990-09-30 | 1990-09-30 | Liquid-core optical fiber sensor with changeable length of light transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90108107 CN1023730C (en) | 1990-09-30 | 1990-09-30 | Liquid-core optical fiber sensor with changeable length of light transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1060537A CN1060537A (en) | 1992-04-22 |
| CN1023730C true CN1023730C (en) | 1994-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90108107 Expired - Fee Related CN1023730C (en) | 1990-09-30 | 1990-09-30 | Liquid-core optical fiber sensor with changeable length of light transmission |
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| Country | Link |
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| CN (1) | CN1023730C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207846B (en) * | 2019-06-26 | 2021-02-02 | 哈尔滨工程大学 | Capillary tube optical fiber temperature sensor |
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1990
- 1990-09-30 CN CN 90108107 patent/CN1023730C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1060537A (en) | 1992-04-22 |
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