CN104316236A - Separated compression bar type pressure sensor - Google Patents
Separated compression bar type pressure sensor Download PDFInfo
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- CN104316236A CN104316236A CN201410615857.4A CN201410615857A CN104316236A CN 104316236 A CN104316236 A CN 104316236A CN 201410615857 A CN201410615857 A CN 201410615857A CN 104316236 A CN104316236 A CN 104316236A
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- depression bar
- compression bar
- top cap
- transmission
- threaded connector
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Abstract
The invention discloses a separated compression bar type pressure sensor which comprises a threaded connector, a supporting drum, a top cap, compression bars and a strain measuring element. Each compression bar is composed of an incidence compression bar and a transmission compression bar, a compression screw and a sealing body are arranged at the front end of the threaded connector, the threaded connector is screwed in one end of the supporting drum, and the other end of the supporting drum is connected with the top cap through threads; the front end face of each incidence compression bar is flush with the threaded connector, the incidence compression bars penetrate through the middle portion of the compression screw and the middle portion of the sealing body, the rear end of each incidence compression bar is arranged in the supporting drum, and the top cap penetrates through the front end of each transmission compression bar and makes tight contact with the rear end of each incidence compression bar, a buffer pressing plate, a cushion pad and an adjustment screw rod are sequentially arranged in the top cap located at the rear end of each transmission compression bar, the adjustment screw rods are connected with the top cap through threads, and the strain measuring element is arranged at one ends, close to the transmission compression bars, of the incidence compression bars. The separation compression bar type pressure sensor has the advantages of being wide in measurement range and short in response time, the measurement time is not limited by the length of the bars, and the separation compression bar type pressure sensor has high electromagnetic interference resistance.
Description
Technical field
The invention belongs to field of sensing technologies, particularly relate to a kind of disjoining pressure rod-type dynamic high voltage sensing.
Background technology
In near region explosion wave Protective Research, plate armour and naval vessels antiknock research, explode in the development such as generating means, explosive container, need to carry out contacting or closely, close or implement chemical explosion under semiclosed condition, the shock wave load parameter acting on structure wall is in this case the basis of carrying out its Structural dynamic response analysis, safety assessment and engineering design.Obtain time history and the distribution situation of used load on accurate, reliable structure wall, significant to research structure dynamic response.
Depression bar manometry is that Hopkinson put forward in 1914 the earliest, its ultimate principle is one end that known pressure acts on an elongate rod, it causes a stress wave propagated along bar in bar, paste sensitive element in the somewhere of bar to measure this stress wave, record it over time, the pressure signal acting on boom end can be obtained.Because depression bar has certain length, sensitive element can design at the certain position leaving depression bar head, so just can avoid the direct effect of explosive flame and high temperature, therefore presser bar pressure sensor has been proved to be that a kind of principle is simple, range ability is wide, the response time is fast, cost is low, be particularly suitable for the method for near region explosion wave load measurement.But also there are two shortcomings in conventional presser bar pressure sensor: (1) supposes that the length of depression bar is
, sensitive element is positioned at distance depression bar breech face
place, when tail end Reflection From Free Surface stress pulse propagates into sensitive element, reflected impulse will superpose with incident pulse, measured waveform distortion.Therefore, effective Measuring Time of depression bar is
, wherein
for the Stress wave speed in bar.If increase effective Measuring Time, just need increase the length of depression bar, and the processing of long depression bar and installation support require higher.(2) can along with strong electromagnetic interference (EMI) in gunpowder explosion process, the sensitive element that current presser bar pressure sensor is conventional has piezoelectric crystal, resistance strain gage etc., its anti-electromagnetic interference capability is all not strong, the electromagnetic interference signal that blast produces easily is coupled into test macro by the sensitive element in elongate rod and lead-in wire, causes test signal serious distortion.
Summary of the invention
The object of this invention is to provide a kind of disjoining pressure rod-type pressure transducer, not only range ability is wide for it, the response time is fast, and Measuring Time is no longer by the restriction that bar is long, and there is stronger anti-electromagnetic interference capability.
In order to realize above-mentioned technical purpose, the technical solution used in the present invention is, described disjoining pressure rod-type pressure transducer, comprise threaded connector, support tube, top cap, depression bar and strain measurement element, described depression bar is made up of incident depression bar and transmission depression bar, the front end of threaded connector is provided with housing screw and seal, support tube one end screws in threaded connector, the other end is threaded connection with top cap, incident depression bar front end face is concordant with threaded connector, incident depression bar is through housing screw, the middle part of seal, rear end is arranged in support tube, transmission depression bar front end is through top cap, with incident depression bar rear end close contact in support tube, buffering pressing plate is set gradually in the top cap of transmission depression bar rear end, cushion pad and adjusting screw(rod), be threaded connection between adjusting screw(rod) and top cap, regulate incident depression bar front end face concordant with threaded connector front end as pressure-sensitive face by the screw-in depth of regulating and controlling screw rod, described strain measurement element is arranged on the one end near transmission depression bar on incident depression bar.
Described support tube front-end and back-end are respectively arranged with O type circle.
Described seal is lead, the sealing for pick up calibration and when using.
Described strain measurement element is fiber grating.
Technique effect of the present invention is, adopts the incident depression bar of close contact and transmission depression bar to replace traditional single depression bar, and make the Measuring Time of sensor no longer by the restriction that bar is long, overall sensor size miniaturization, installs and uses more convenient; Adopt the fiber grating of electromagnetism interference as the stress wave in sensitive element test depression bar, not only highly sensitive, test process also not by the impact of electromagnetic interference (EMI), makes the measuring accuracy of sensor higher; The high strength alloy steel adopting yield limit to be greater than 1000MPa makes incident depression bar and transmission depression bar, and through suitable Tempering and Quenching and the design of rational length-diameter ratio, make sensor can measure the pressure signal being greater than 1000 MPa, there is the fast response time being less than 10 μ s simultaneously.In sum, sensor of the present invention be obtain accurately, the time history of used load and distribution situation provide a kind of simple, reliable, high-precision method of testing on structure wall reliably, significant to area research structural dynamic responses such as protection works, the assessments of weapon damage effect.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is separate type depression bar pressure measuring principle schematic diagram.
In figure: 1, housing screw, 2, seal, 3, threaded connector, 4, support tube, 5, incident depression bar, 6, fiber grating, 7, transmission depression bar, 8, O type circle, 9, top cap, 10, buffering pressing plate, 11, cushion pad, 12, adjusting screw(rod), 13, strain measurement element, 14, buffer bar.
Embodiment
By reference to the accompanying drawings, specific embodiments of the invention are further illustrated.
As shown in Figure 1: disjoining pressure rod-type pressure transducer of the present invention, by housing screw 1, seal 2, threaded connector 3, support tube 4, incident depression bar 5, fiber grating 6, transmission depression bar 7, O type circle 8, top cap 9, buffering pressing plate 10, cushion pad 11, adjusting screw(rod) 12 forms, housing screw 1 and seal 2 are placed in the front end of threaded connector 3, incident depression bar 5 passes in the middle of this three, support tube 4 one end screws in threaded connector 3, the other end is threaded connection with top cap 9, by transmission depression bar 7 through top cap 9 and support tube 4 and incident depression bar 5 one end close contact, in the cap 9 of top, the other end of transmission depression bar 7 puts into buffering pressing plate 10 successively, cushion pad 11, adjusting screw(rod) 12, be threaded connection between adjusting screw(rod) 12 and top cap 9, the screw-in depth of regulating and controlling screw rod 12 regulates incident depression bar 5 concordant as pressure-sensitive face with threaded connector 3 front end away from that end face of transmission depression bar 7, what the strain measurement element in the embodiment of the present invention adopted is fiber grating 6, and it sticks in the one end near transmission depression bar 7 on incident depression bar 5.Threaded connector 3 is mainly used in when sensor measurement uses and the connection of measured body, and arranges ring groove on connector, and ring groove can place the sealing of copper washer for connector and measured body; Support tube 4 mainly plays support to depression bar and motion guide, keeps certain air gap between itself and depression bar by the effect of O type circle 8; The sealing of seal 2 for pick up calibration and when using; Buffering pressing plate 10 and cushion pad 11 are for the buffering to transmission depression bar 7.
This disjoining pressure rod-type pressure device adopts the know-why being separated depression bar as follows:
As shown in Figure 2, separate type depression bar is that an elongate rod is divided into two sections, and namely become two bars from a bar, the bar wherein contacted with pressure is called incident depression bar, second bar is called transmission depression bar.Incident depression bar free end face and transmission depression bar end face parallel contact, namely two planes a little contact all simultaneously.When stress wave arrives the interface of two bars, due to the reflection of ripple in interface and transmission, produce the elastic compression ripple that two directions of propagation are contrary, one is reflected back incident depression bar, and another imports transmission depression bar into, and the reflection coefficient be located on interface is
, transmission coefficient is
, according to elastic wave theory, and force balance principle equal with both sides, interface particle rapidity, can derive
，
（1）
In formula,
,
, be respectively the wave impedance of incident depression bar and transmission depression bar material.
Because incident depression bar and transmission depression bar adopt same material, from formula (1), the reflection coefficient on interface is 0, therefore, ideally, when the acoustic impedance of material is equal, interface can not be reflected, and the complete transmission of stress wave enters transmission depression bar.
After shock wave pressure acts on incident depression bar end, the stress produced in incident depression bar is
, incident depression bar is with particle velocity
motion; After shock wave all enters transmission depression bar by incident depression bar, the stress in incident depression bar is 0, then the particle velocity of incident depression bar is also 0, incident depression bar stop motion, and the stress wave now entering transmission depression bar also makes transmission depression bar with particle velocity
motion, therefore incident depression bar and transmission depression bar depart from; When the stress wave right lateral in transmission depression bar arrives boom end free face, the stress wave be reflected back also can arrive left side, but now transmission depression bar departs from incident depression bar, and stress wave no longer enters incident depression bar.Transmission depression bar stops also continuing to move to buffer bar under the effect of right lateral stress wave and reflection wave after.Therefore after adopting separate type depression bar, by measuring the strain in incident depression bar, can obtain the pressure acting on incident depression bar end, because stress wave no longer turns back to incident depression bar, effective Measuring Time of pressure is no longer by the restriction that bar is long.
Adopt the fiber grating of electromagnetism interference as the stress wave in strain measurement element test depression bar in the embodiment of the present invention, not only highly sensitive, test process also not by the impact of electromagnetic interference (EMI), makes the measuring accuracy of sensor higher.It is pointed out that in the more weak or non-existent measurement occasion of some electromagnetic interference (EMI), according to measurement demand, the strain measurement element on disjoining pressure rod-type pressure transducer of the present invention can be replaced by resistance strain gage, reduce and measure cost.
Claims (4)
1. a disjoining pressure rod-type pressure transducer, comprise threaded connector, support tube, top cap, depression bar and strain measurement element, it is characterized in that: described depression bar is made up of incident depression bar and transmission depression bar, the front end of threaded connector is provided with housing screw and seal, support tube one end screws in threaded connector, the other end is threaded connection with top cap, incident depression bar front end face is concordant with threaded connector, incident depression bar is through housing screw, the middle part of seal, rear end is arranged in support tube, transmission depression bar front end is through top cap, with incident depression bar rear end close contact in support tube, buffering pressing plate is set gradually in the top cap of transmission depression bar rear end, cushion pad and adjusting screw(rod), be threaded connection between adjusting screw(rod) and top cap, regulate incident depression bar front end face concordant with threaded connector front end as pressure-sensitive face by the screw-in depth of regulating and controlling screw rod, described strain measurement element is arranged on the one end near transmission depression bar on incident depression bar.
2. disjoining pressure rod-type pressure transducer according to claim 1, is characterized in that: described support tube front-end and back-end are respectively arranged with O type circle.
3. disjoining pressure rod-type pressure transducer according to claim 1, is characterized in that: described seal is lead, the sealing for pick up calibration and when using.
4. disjoining pressure rod-type pressure transducer according to claim 1, is characterized in that: described strain measurement element is fiber grating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410615857.4A CN104316236B (en) | 2014-11-05 | 2014-11-05 | Separated compression bar type pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410615857.4A CN104316236B (en) | 2014-11-05 | 2014-11-05 | Separated compression bar type pressure sensor |
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| Publication Number | Publication Date |
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| CN104316236A true CN104316236A (en) | 2015-01-28 |
| CN104316236B CN104316236B (en) | 2017-01-25 |
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|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280690A (en) * | 2008-03-14 | 2008-10-08 | 山东省科学院激光研究所 | Pressure sensor |
| CN201819840U (en) * | 2010-07-28 | 2011-05-04 | 铁道第三勘察设计院集团有限公司 | Dual-purpose axial forcing head of triaxial apparatus capable of eliminating influence of lateral pressure |
| CN204154425U (en) * | 2014-11-05 | 2015-02-11 | 中国人民解放军总参谋部工程兵科研三所 | A kind of disjoining pressure rod-type pressure transducer |
-
2014
- 2014-11-05 CN CN201410615857.4A patent/CN104316236B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280690A (en) * | 2008-03-14 | 2008-10-08 | 山东省科学院激光研究所 | Pressure sensor |
| CN201819840U (en) * | 2010-07-28 | 2011-05-04 | 铁道第三勘察设计院集团有限公司 | Dual-purpose axial forcing head of triaxial apparatus capable of eliminating influence of lateral pressure |
| CN204154425U (en) * | 2014-11-05 | 2015-02-11 | 中国人民解放军总参谋部工程兵科研三所 | A kind of disjoining pressure rod-type pressure transducer |
Non-Patent Citations (2)
| Title |
|---|
| 朱萍玉等: "光纤Bragg光栅在分离式Hopkinson压杆实验中的应用", 《天津大学学报》 * |
| 陈荣等: "分离式Hopkinson压杆实验技术研究进展", 《力学进展》 * |
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