CN103968784A - Liquid level type strain sensor - Google Patents
Liquid level type strain sensor Download PDFInfo
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- CN103968784A CN103968784A CN201310045525.2A CN201310045525A CN103968784A CN 103968784 A CN103968784 A CN 103968784A CN 201310045525 A CN201310045525 A CN 201310045525A CN 103968784 A CN103968784 A CN 103968784A
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- liquid level
- concrete
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Abstract
A liquid level type strain sensor comprises a hollow strain body, liquid, a guide pipe and a liquid level measuring device. The hollow strain body is made of an elastic material, embedded into concrete and internally filled with the liquid, and one end of the guide pipe is communicated with the hollow strain body while the other end is led out of the concrete and fixed on the outer surface of the concrete. The liquid level measuring device is disposed independently. When strain happens to the concrete at a measuring point, the hollow strain body deforms with the concrete, and liquid level of the exposed end of the guide pipe is changed due to own volume change. A strain value can be calculated according to liquid level variation and geometric sizes of the guide pipe and the strain body.
Description
Technical field
What the present invention relates to is a kind of strain sensing apparatus of sensor field, particularly a kind of liquid-level type strain transducer.
Background technology
Strain is the key index of reflect structure local pressure situation under load action, is the major parameter of structural safety state.Therefore, in the construction and use procedure of xoncrete structure, to strain carry out for a long time, in real time, on-line monitoring, significant to guaranteeing structural safety.In xoncrete structure, require that the precision of strain transducer meets that relevant specification requires, working temperature meets that the minimum and maximum temperature of building place requires, anti-electromagnetic interference (EMI) is strong, good endurance.The strain transducer using at present comprises strain ga(u)ge, string wire strainometer, fiber Bragg grating strain sensor etc.But it is shorter that strain ga(u)ge is subject to electromagnetic interference (EMI), easily drift, life-span, and the defect of string wire strainometer is that drift and temperature drift are obvious, general string wire drift 3～5Hz/3 month, temperature drift 3～4Hz/10
oc, the normal operating period is only about 3 years.At present popular is to adopt fiber Bragg grating strain sensor, and it utilizes optical principle, by measuring the variation of grating, measures corresponding strain.Compare with strain ga(u)ge have that reliability is high, good stability, accuracy is high, anti-electromagnetic interference capability is strong, corrosion-resistant, quality light, be convenient to form the advantages such as remote telemetry network.Find by prior art documents, Chinese patent, application number: 01129192.3, patent name: " buried optical fibre strain sensor for concrete structure ", a kind of embedding type optical fiber strain sensor that can be used for reinforced concrete structure is disclosed, its structure comprises disrance sleeve, resilient seal linkage section, bare fibre strain sensing device and draw optical fiber etc., its defect is: the long-time stability of Fibre Optical Sensor and reliability are subject to the restriction of two principal elements: the drift of source device output optical power and fiber optic protection layer aging, especially be positioned at the probe in region to be measured, the aging of protective coating problem of sensitive optical fibre and jointed fiber is even more serious.Therefore, the normal service life of fiber device also only had about 15 years.And the design life of xoncrete structure is generally in 50 years, even 100 years, if the internal strain situation of structure is carried out to long term monitoring, just need to develop a kind of longer service life, more reliability and durability strain transducer.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of liquid-level type strain transducer is provided.
Structure of the present invention is comprised of hollow response body, liquid, conduit, liquid level emasuring device.Hollow response body is embedded in inside concrete, inner filling liquid, and one end of conduit communicates with hollow response body, and the other end is drawn concrete and is fixed on concrete outside surface.Liquid level emasuring device is independently placed.
Described hollow response body, is made by resilient material, and outside surface and concrete are fixed.
The principle of this structure is: the hollow response body of small size is embedded in strain measuring point place, when concrete generation strain, hollow response body can deform thereupon, the variation of own vol causes the volume that inner institute can receiving fluids to change, and this variation can be reflected in the liquid level variation of conduit exposed junction.When response body is elongated, the liquid that receive inside increases, and liquid level will decline.Otherwise liquid level can rise.After variable quantity by liquid level emasuring device (as ultrasonic level gage, photoelectric liquid level gauge, fiber optic liquid height meter etc.) Accurate Measurement liquid level, according to the physical dimension of conduit and response body, just can converse the strain value at this place.
The present invention is simple in structure, is convenient to safeguard, reliability and durability, and long service life is not subject to the impact of burn into electromagnetic wave etc.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of liquid-level type strain transducer.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed embodiment and process, but protection scope of the present invention is not limited to following embodiment.
First the small hollow response body 1 of volume is embedded in to the strain measuring point place of inside concrete, arranges a conduit 2, its one end communicates with hollow response body 1, and the other end is drawn concrete and is fixed on concrete outside surface.When the concrete generation strain of measuring point place, hollow response body 1 can deform thereupon, and the variation of own vol causes the volume that inner institute can receiving fluids 3 to change, and this variation can be reflected in the liquid level variation of conduit 2 exposed junctions.When response body 1 is elongated, the liquid 3 that receive inside increases, and liquid level will decline.Otherwise liquid level can rise.By liquid level emasuring device 4(as ultrasonic level gage, photoelectric liquid level gauge, fiber optic liquid height meter etc.) variable quantity that can Accurate Measurement liquid level, then according to the size of the inside dimension of response body 1 and conduit 2, just can converse the strain value that this place occurs.
Claims (2)
1. a liquid-level type strain transducer, it is characterized in that, structure is comprised of hollow response body, liquid, conduit, liquid level emasuring device, hollow response body is embedded in inside concrete, inner filling liquid, one end of conduit communicates with hollow response body, and the other end is drawn concrete and is fixed on concrete outside surface, and liquid level emasuring device is independently placed.
2. liquid-level type strain transducer as claimed in claim 1, is characterized in that, described hollow response body, is made by resilient material, and outside surface and concrete are fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310045525.2A CN103968784A (en) | 2013-02-06 | 2013-02-06 | Liquid level type strain sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310045525.2A CN103968784A (en) | 2013-02-06 | 2013-02-06 | Liquid level type strain sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103968784A true CN103968784A (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310045525.2A Pending CN103968784A (en) | 2013-02-06 | 2013-02-06 | Liquid level type strain sensor |
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| CN (1) | CN103968784A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767669A (en) * | 2017-03-28 | 2017-05-31 | 天津城建大学 | The unidirectional strain detection testing device of the soil body and its method of testing |
| CN108896366A (en) * | 2018-07-09 | 2018-11-27 | 西安建筑科技大学 | The loess sample preparation device and method for making sample of pore water chemical concentrations are determined in preparation |
| CN109773098A (en) * | 2019-03-15 | 2019-05-21 | 上海嘉仕久企业发展有限公司 | A kind of spindle processing technology and the blanking measuring device for the technique |
| CN110648504A (en) * | 2019-09-30 | 2020-01-03 | 中南大学 | Landslide disaster monitoring device and method |
| CN110865014A (en) * | 2019-11-26 | 2020-03-06 | 河海大学 | Rock pore seepage model testing device and method under coupling action based on nuclear magnetic resonance |
-
2013
- 2013-02-06 CN CN201310045525.2A patent/CN103968784A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106767669A (en) * | 2017-03-28 | 2017-05-31 | 天津城建大学 | The unidirectional strain detection testing device of the soil body and its method of testing |
| CN106767669B (en) * | 2017-03-28 | 2022-11-29 | 天津城建大学 | Soil body unidirectional strain testing device and testing method thereof |
| CN108896366A (en) * | 2018-07-09 | 2018-11-27 | 西安建筑科技大学 | The loess sample preparation device and method for making sample of pore water chemical concentrations are determined in preparation |
| CN109773098A (en) * | 2019-03-15 | 2019-05-21 | 上海嘉仕久企业发展有限公司 | A kind of spindle processing technology and the blanking measuring device for the technique |
| CN110648504A (en) * | 2019-09-30 | 2020-01-03 | 中南大学 | Landslide disaster monitoring device and method |
| CN110865014A (en) * | 2019-11-26 | 2020-03-06 | 河海大学 | Rock pore seepage model testing device and method under coupling action based on nuclear magnetic resonance |
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Application publication date: 20140806 |