CN85103840A - Optical fiber stress sensor - Google Patents
Optical fiber stress sensor Download PDFInfo
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- CN85103840A CN85103840A CN198585103840A CN85103840A CN85103840A CN 85103840 A CN85103840 A CN 85103840A CN 198585103840 A CN198585103840 A CN 198585103840A CN 85103840 A CN85103840 A CN 85103840A CN 85103840 A CN85103840 A CN 85103840A
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- optical fiber
- photoelastic
- components
- fiber stress
- stress
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Abstract
Optical fiber stress sensor is a kind of fiber stress pick-up unit that is used to measure this class Binder Materials internal stress of concrete.The present invention adopts two sides to post the photoelastic components of polarizing diaphragm respectively as sensing head.The transducing head subelement is few, volume is little, low price, antijamming capability are strong, is particularly suitable for disposable internal stress measuring, also can be used for detecting soil stress etc.
Description
The present invention and fiber stress are measured relevant, and more particularly, this sensor mainly is to detect the internal stress of the opaque Binder Materials of this class of concrete and soil stress etc.
Before this, measuring soil stress mainly is with various electrical measurement pressure cells, the shortcoming of this class sensor is that volume is big, the cost height, be subject to electromagnetic interference (EMI), and this class Binder Materials of concrete component planted agent force measurement, still find no the effect means, there are some to be used for the Fibre Optical Sensor of gaging pressure at present, roll up 11 copy (APPLIED OPTICS/Vol 22 No.11/1983s according to optical fiber and photoelastic complex art at applied optics magazine 22 as rugged field people such as (Shuichi Tai), a kind of pressure survey scheme has been proposed 1771-1774), and success be used for acceleration analysis, but because the sensing head part has adopted photoelastic principle fully, still exist element many, volume is big, problems such as cost height, and necessary adapted monochromatic source (as laser) are so be not suitable for the internal stress measuring that this kind disposable of concrete uses.
Fundamental purpose of the present invention is exactly in order to address the above problem, and the internal stress measuring that uses for this kind disposable of concrete provides a kind of volume little, is not afraid of that humidity, antijamming capability are strong, low price, does not have the optical fiber stress sensor of displacement component.
Accompanying drawing 1 is the optical fiber stress sensor synoptic diagram.1 is incandescent lamp, the 2nd among the figure, and photoelectric detection system, 3 and 5 is polarizing coatings, the 4th, photoelastic components, the 6th, multimode optical fiber, the 7th, pre-bias adjustment screw, the 8th, photoelectric commutator.The light that light source 1 sends is delivered to sensing head (dotted portion) through polarizing diaphragm complanation polarized light by optical fiber 6, passes photoelastic components 4, through passing to photoelectric detection system 2 by optical fiber 6 after polaroid 5 analyzings.When the suffered stress of photoelastic components changes, because of birefringence can obtain the output light of a sinusoidal variations, when light incident was white light, transmitted light is the stronger colour of contrast to be changed, detect intensity variations by detecting device, can measure corresponding stress intensity.
The present invention recommends following embodiment:
Photoelastic performances such as photoelastic components employing epoxy resin are good, bear the big macromolecular material of pressure and make the suitable thin slice of thickness, and stick the polarizing diaphragm of quadrature respectively in two sides, and make the optical axis of photoelastic components become 45 jiaos with the light transmission shaft of two polarizing diaphragms respectively, then this sensing head is contained on the V groove assembly fixture.Fig. 2 is the assembling synoptic diagram of V groove assembly fixture, and 9 is that the assembly fixture 6 of band V groove is that optical fiber, 3 and 5 is polarizing diaphragms, the 4th among the figure, photoelastic components, the 7th, pre-bias adjustment screw.Utilize the coupling shelf of V groove as optical fiber, installing the back adds certain pressure for photoelastic components 4 with screw 7 in advance, make the linear work district that show of working sensor at Fig. 3, abscissa axis is represented the suffered stress of sensor among Fig. 3, and axis of ordinates is represented the transmittance by sensing head.Light source 1 adopts from vehement lamp.In order to reduce the error that light drift causes, the part of the light that light source 1 is sent is directly inputted to photoelectric commutator 8 by another optical fiber, and with the output signal of this photoelectric commutator through the feedback signal of suitable processing as photoelectric detection system.
The present invention can be at 0-500kg/cm
2Scope in measure, sensitivity is 10g/cm
2
Characteristics of the present invention are that the sensing head element is few, volume is little, highly sensitive, antijamming capability is strong, moisture resistant, low price, there is not displacement component, be particularly suitable for measuring the disposable internal stress of this class of concrete and measure, also can be used for detecting soil stress and under various adverse circumstances, measure stress simultaneously.
Claims (6)
- A kind of optical fiber stress sensor that is used to detect internal stress, prior art sensing head comprise that two lens, 1/4 wave plate, two polaroids and a photoelastic components constitute.1, the invention is characterized in that sensing head only is made of two polaroids and a photoelastic components.
- 2, according to right 1 described optical fiber stress sensor, it is characterized in that to the photoelastic components precharge.
- 3, according to right 1 and 2 described optical fiber stress sensors, it is characterized in that adopting macromolecular material as photoelastic components.
- 4, according to right 1 to 3 described optical fiber stress sensor, it is characterized in that adopting incandescent light source.
- 5, right 1 to 4 described optical fiber stress sensor is characterized in that having the light signal feedback.
- 6, according to right 3 described photoelastic components, it is characterized in that being assemblied on the equipment frame that has V groove and bias adjustment screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585103840A CN85103840A (en) | 1985-05-09 | 1985-05-09 | Optical fiber stress sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198585103840A CN85103840A (en) | 1985-05-09 | 1985-05-09 | Optical fiber stress sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85103840A true CN85103840A (en) | 1986-11-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN198585103840A Pending CN85103840A (en) | 1985-05-09 | 1985-05-09 | Optical fiber stress sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85103840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106662491A (en) * | 2014-06-03 | 2017-05-10 | 学校法人冲绳科学技术大学院大学学园 | System and method for obtaining force based on photoelasticity |
-
1985
- 1985-05-09 CN CN198585103840A patent/CN85103840A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106662491A (en) * | 2014-06-03 | 2017-05-10 | 学校法人冲绳科学技术大学院大学学园 | System and method for obtaining force based on photoelasticity |
| CN106662491B (en) * | 2014-06-03 | 2019-07-09 | 学校法人冲绳科学技术大学院大学学园 | System and method for obtaining power based on photoelastic method |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |