CN105758576A - Dual sensitive element pen type free field pressure sensor - Google Patents
Dual sensitive element pen type free field pressure sensor Download PDFInfo
- Publication number
- CN105758576A CN105758576A CN201610114759.1A CN201610114759A CN105758576A CN 105758576 A CN105758576 A CN 105758576A CN 201610114759 A CN201610114759 A CN 201610114759A CN 105758576 A CN105758576 A CN 105758576A
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- core electrode
- hole
- pressure
- diversion rod
- pen type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/14—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force of explosions; for measuring the energy of projectiles
Abstract
The invention discloses a dual sensitive element pen type free field pressure sensor, and belongs to the technical field of explosive shock wave overpressure field measurement. The dual sensitive element pen type free field pressure sensor comprises a guide rod, a core electrode, piezoelectric elements, pressure bearing copper electrodes, elastic elements, a positioning cylinder, insulation positioning sleeves, a signal line, a connector and a cable connecting seat. The core electrode is located in a radial through hole of the guide rod. The two piezoelectric elements and the two pressure bearing copper electrodes are located coaxially at two ends of the core electrode respectively. The two insulation positioning sleeves coaxially sleeve external circumferential surfaces of the core electrode, the piezoelectric elements and the pressure bearing copper electrodes. The positioning cylinder and the two elastic elements both coaxially mounted in a sleeving manner in gaps between the insulation positioning sleeves and the radial through hole of the flow guide rod. One end of the connector is fixed in an axial blind hole of the flow guide rod, and an axial through hole in the other end is equipped with the cable connecting seat. Two ends of the signal line are respectively fixed in the through hole of the core electrode and on the cable connecting seat. The sensor has good water tightness and impact resistance and can meet the requirements of field explosion test.
Description
Technical field
The invention belongs to explosion wave Overpressure Field field of measuring technique, be specifically related to a kind of sensitive element pen type free-field blast pressure "pencil" sensor.
Background technology
The peak overpressure of the air-shock wave that explosive explosion time aloft generates and momentum are important parameters of explosive energy characteristic, are also the important indicators weighing ammunition particularly explosion and blastfragmentation warhead damage effect.When in blast aloft or water shooting positive pressure of shock wave field, directly the positive pressure of shock wave of component sensitive component surfaces is vertically skimmed in measurement, it is necessary to use free-field blast pressure "pencil" sensor；This sensor support bar must be made when this sensor is installed to point to explosion center.In the wild in explosive test, during this free-field blast pressure "pencil" sensor is applicable to, remote upper directly measuring from ground certain altitude positive pressure of shock wave.
The pressure transducer measuring free field positive pressure of shock wave at present is generally penholder shape, and the pointed shape mainly applying penholder front end carries out water conservancy diversion, does not affect shock wave incoming flow conditions as far as possible.The sensing element of the pressure transducer of domestic measurement free field positive pressure of shock wave mostly is tourmaline, material fragility, broken after falling；The sensor of external free field product sensor is only installed at penholder side, and volume is relatively big, expensive.
In the wild in explosive test, it is desirable to pressure transducer must have following performances:
(1) sufficiently wide range, if upper limit amount journey is 200MPa, lower limit amount is 0.5MPa；
(2) sufficiently high sensitivity, such as 40pc/MPa～200pc/MPa；
(3) sensitivity is non-linear, such as≤1%；
(4) rise time, such as≤2 μ s～10 μ s；
(5) operating temperature, such as-20 DEG C～60 DEG C；
(6) there is the performance to water-stop；
(7) there is structure shock resistance.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of sensitive element pen type free-field blast pressure "pencil" sensor, this sensor is symmetrical arranged two piezoelectric elements, effectively enhances pressure experience sensitivity；And this sensor has good watertightness and impact resistance, it is possible to meet field explosive test requirement.
The present invention is achieved through the following technical solutions:
A kind of sensitive element pen type free-field blast pressure "pencil" sensor, including: diversion rod, core electrode, piezoelectric element, pressure-bearing copper electrode, flexible member, positioning tube, insulating positioning sleeve, holding wire, union joint and cable connecting seat；
Described diversion rod one end is taper, and the other end is cylindricality；Outer circumference surface at diversion rod is processed two planes parallel to each other；Cylindrical end end face at diversion rod is processed axial blind hole, and in two planes parallel to each other of diversion rod, processing has radial direction through hole, and described radial direction through hole communicates with axial blind hole；
Described core electrode is cylindrical structural, and the outer circumference surface at core electrode is provided with annular boss, and on annular boss, processing has the through hole along core electrode radial direction；
Described piezoelectric element and pressure-bearing copper electrode are discoideus structure；
Described flexible member is the cylinder that one end open one end is closed；
Described insulating positioning sleeve is the cylinder that processing has notch cuttype axially extending bore；
Described union joint is the notch cuttype cylindrical-shaped structure with axially extending bore；
Its annexation is as follows: core electrode is positioned at the radial direction through hole of diversion rod, and two piezoelectric elements and two pressure-bearing copper electrodes are coaxially located at the two ends of core electrode respectively, and wherein, the end face of two piezoelectric elements is all fitted on the end face of core electrode；Two insulating positioning sleeve coaxial packages are at the outer circumference surface of core electrode, piezoelectric element and pressure-bearing copper electrode；Positioning tube and two equal coaxial packages of flexible member are in the insulating positioning sleeve gap with the radial direction through hole of diversion rod, wherein, the open end of two flexible members is inconsistent with the two ends of positioning tube respectively, the inner face of two resilient member closes ends is conflicted with two pressure-bearing copper electrodes respectively, outer face respectively with the flush of diversion rod；One end of union joint is fixed in the axial blind hole of diversion rod, and the axially extending bore of the other end is provided with cable connecting seat；The two ends of holding wire are separately fixed in the through hole of core electrode and on cable connecting seat.
Further, also including O shape cushion rubber, described O shape cushion rubber is arranged on the contact surface of union joint and diversion rod.
Further, described positioning tube is the cylinder that side is not closed.
Further, described core electrode adopts phosphor bronze.
Further, described piezoelectric element adopts quartz.
Further, described flexible member, positioning tube and union joint all adopt rustless steel.
Beneficial effect: the piezoelectric element in (1) present invention adopts two panels quartz crystal as sensing element, it is distributed in the both sides of diversion rod, enhance pressure experience sensitivity, and making sensor of the invention have excellent temperature performance by the low linear expansion coefficient performance of piezoelectric element, temperature is waftd only small；Flexible member in the present invention, has good structure shock resistance；Flexible member and piezoelectric element are arranged on the middle part of diversion rod, have two plane symmetry pressure-bearing surfaces, can improve sensor piezoelectric property reliability.
(2) diversion rod in the present invention is that one integral piece processes, and has fabulous structural strength and mounting process stability, and its head is that nib is streamlined, adopts diversion technology, decreases the interference in shock wave flow field；The streamline structure of diversion rod, the impact in tested flow field is less, but the state in former flow field can be affected more or less；When shock wave skims over the cone tip of diversion rod, the impact of the stagnation disturbance at cone tip place is bigger；When skimming over flexible member and piezoelectric element when shock wave, shock wave and after ripple flow field reached steadily, piezoelectric element, by experiencing the effect of the pure static pressure after shock wave wave surface, does not namely have the impact of stagnation disturbance.
(3) the O shape cushion rubber in the present invention achieves the function of water-stop and acoustic insulation.
(4) sensor of the invention directly measures the shock wave whether superpressure of pass over sensor sensing element, and has sufficiently wide range, sufficiently high sensitivity, enough good sensitivity linear properties, sufficiently wide operating temperature range and to water sealing property；Disclosure satisfy that the requirement of field explosive test.
Accompanying drawing explanation
Fig. 1 is the structure composition diagram of the present invention.
Fig. 2 is the partial enlarged drawing at A place in Fig. 1.
Fig. 3 is the profile of the diversion rod of the present invention.
Fig. 4 is the top view of the diversion rod of the present invention.
Fig. 5 is the structure chart of the core electrode of the present invention.
Fig. 6 is the structure chart of the flexible member of the present invention.
Fig. 7 is the structure chart of the positioning tube of the present invention.
Fig. 8 is the structure chart of the insulating positioning sleeve of the present invention.
Fig. 9 is the structure chart of the union joint of the present invention.
Wherein, 1-diversion rod, 2-core electrode, 3-piezoelectric element, 4-pressure-bearing copper electrode, 5-flexible member, 6-positioning tube, 7-insulating positioning sleeve, 8-holding wire, 9-O shape cushion rubber, 10-union joint, 11-cable connecting seat.
Detailed description of the invention
Develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The invention provides a kind of sensitive element pen type free-field blast pressure "pencil" sensor, referring to accompanying drawing 1,2, including: diversion rod 1, core electrode 2, piezoelectric element 3, pressure-bearing copper electrode 4, flexible member 5, positioning tube 6, insulating positioning sleeve 7, holding wire 8, O shape cushion rubber 9, union joint 10 and cable connecting seat 11；
Referring to accompanying drawing 3,4, described diversion rod 1 one end is taper, and the other end is cylindricality, and one end of diversion rod 1 is circular cone, and the other end of diversion rod 1 is cylinder；Outer circumference surface at diversion rod 1 is processed two planes parallel to each other；Cylindrical end end face at diversion rod 1 is processed axial blind hole, and in two planes parallel to each other of diversion rod 1, processing has radial direction through hole, and described radial direction through hole communicates with axial blind hole, and in axial blind hole, processing has female thread；
Referring to accompanying drawing 5, described core electrode 2 is cylindrical structural, and the outer circumference surface at core electrode 2 is provided with annular boss, and on annular boss, processing has the through hole along core electrode 2 radial direction；
Described piezoelectric element 3 and pressure-bearing copper electrode 4 are discoideus structure；
Referring to accompanying drawing 6, the cylinder that described flexible member 5 is closed for one end open one end；
Referring to accompanying drawing 7, the cylinder that described positioning tube 6 is not closed for side；
Referring to accompanying drawing 8, described insulating positioning sleeve 7 is the cylinder that processing has notch cuttype axially extending bore, and on cylinder, processing has the groove for arranging holding wire 8；
Referring to accompanying drawing 9, described union joint 10 is the notch cuttype cylindrical-shaped structure with axially extending bore, and two ends have processed internal and external screw thread respectively；
Described core electrode 2 adopts phosphor bronze；Piezoelectric element 3 is sensing element, adopts quartz；Flexible member 5, positioning tube 6 and union joint 10 all adopt rustless steel；
Its annexation is as follows: core electrode 2 is positioned at the radial direction through hole of diversion rod 1, and two piezoelectric elements 3 and two pressure-bearing copper electrodes 4 are coaxially located at the two ends of core electrode 2 respectively, and wherein, the end face of two piezoelectric elements 3 is all fitted on the end face of core electrode 2；Two insulating positioning sleeve 7 coaxial packages are at the outer circumference surface of core electrode 2, piezoelectric element 3 and pressure-bearing copper electrode 4；Positioning tube 6 and two equal coaxial packages of flexible member 5 are in the gap of insulating positioning sleeve 7 and the radial direction through hole of diversion rod 1, wherein, the open end of two flexible members 5 is inconsistent with the two ends of positioning tube 6 respectively, the inner face of two flexible member 5 blind ends is conflicted with two pressure-bearing copper electrodes 4 respectively, outer face respectively with the flush of diversion rod 1；Threadeding with the axial blind hole of diversion rod 1 in one end of union joint 10, the axially extending bore of the other end is provided with cable connecting seat 11；And the contact surface of union joint 10 and diversion rod 1 is provided with O shape cushion rubber 9；The two ends of holding wire 8 are respectively through being weldingly fixed in the through hole of core electrode 2 and on cable connecting seat 11.
Operation principle: when carrying out field explosive test, during the shock wave that described sensor measurement aloft explodes or water shooting produces whether superpressure, the axis of diversion rod 1 points to explosion center, can correctly catch the pressure of measuring point place free field shock wave；The conical end shock wave of diversion rod 1 carries out water conservancy diversion；Shock wave vertically skims over the end face of two flexible members 5 with diversion rod 1 flush；The shock wave pressure that flexible member 5 is subjected to passes to two piezoelectric elements 3 by pressure-bearing copper electrode 4, one end of two piezoelectric elements 3 is subject to the active force near core electrode 2, the other end is subject to the support force of core electrode 5, two piezoelectric elements 3 are squeezed and pressure are converted to the signal of telecommunication, are transferred out by core electrode 2, holding wire 8 and cable connecting seat 11；Wherein, pressure-bearing copper electrode 4 has two effects, and one is the satisfactory electrical conductivity transmission signal of telecommunication of applied metal copper, and another is the satisfactory texture intensity carrying dynamic pressure of applied metal copper, it is prevented that the piezoelectric element 3 of fragility produces mechanical failure under dynamic pressure effect.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (6)
1. a sensitive element pen type free-field blast pressure "pencil" sensor, it is characterized in that, including: diversion rod (1), core electrode (2), piezoelectric element (3), pressure-bearing copper electrode (4), flexible member (5), positioning tube (6), insulating positioning sleeve (7), holding wire (8), union joint (10) and cable connecting seat (11)；
Described diversion rod (1) one end is taper, and the other end is cylindricality；Outer circumference surface at diversion rod (1) is processed two planes parallel to each other；Cylindrical end end face at diversion rod (1) is processed axial blind hole, and in two planes parallel to each other of diversion rod (1), processing has radial direction through hole, and described radial direction through hole communicates with axial blind hole；
Described core electrode (2) is cylindrical structural, and the outer circumference surface at core electrode (2) is provided with annular boss, and on annular boss, processing has the through hole along core electrode (2) radial direction；
Described piezoelectric element (3) and pressure-bearing copper electrode (4) are discoideus structure；
The cylinder that described flexible member (5) is closed for one end open one end；
Described insulating positioning sleeve (7) is the cylinder that processing has notch cuttype axially extending bore；
Described union joint (10) is the notch cuttype cylindrical-shaped structure with axially extending bore；
Its annexation is as follows: core electrode (2) is positioned at the radial direction through hole of diversion rod (1), two piezoelectric elements (3) and two pressure-bearing copper electrodes (4) are coaxially located at the two ends of core electrode (2) respectively, wherein, the end face of two piezoelectric elements (3) is all fitted on the end face of core electrode (2)；Two insulating positioning sleeve (7) coaxial packages are at the outer circumference surface of core electrode (2), piezoelectric element (3) and pressure-bearing copper electrode (4)；Positioning tube (6) and two flexible member (5) all coaxial packages are in the insulating positioning sleeve (7) gap with the radial direction through hole of diversion rod (1), wherein, the open end of two flexible members (5) is inconsistent with the two ends of positioning tube (6) respectively, the inner face of two flexible member (5) blind ends is conflicted with two pressure-bearing copper electrodes (4) respectively, outer face respectively with the flush of diversion rod (1)；One end of union joint (10) is fixed in the axial blind hole of diversion rod (1), and the axially extending bore of the other end is provided with cable connecting seat (11)；The two ends of holding wire (8) are separately fixed in the through hole of core electrode (2) and on cable connecting seat (11).
2. a kind of sensitive element pen type free-field blast pressure "pencil" sensor as claimed in claim 1, it is characterized in that, also including O shape cushion rubber (9), described O shape cushion rubber (9) is arranged on the contact surface of union joint (10) and diversion rod (1).
3. a kind of sensitive element pen type free-field blast pressure "pencil" sensor as claimed in claim 1, it is characterised in that the cylinder that described positioning tube (6) is not closed for side.
4. a kind of sensitive element pen type free-field blast pressure "pencil" sensor as claimed in claim 1, it is characterised in that described core electrode (2) adopts phosphor bronze.
5. a kind of sensitive element pen type free-field blast pressure "pencil" sensor as claimed in claim 1, it is characterised in that described piezoelectric element (3) adopts quartz.
6. a kind of sensitive element pen type free-field blast pressure "pencil" sensor as claimed in claim 1, it is characterised in that described flexible member (5), positioning tube (6) and union joint (10) all adopt rustless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610114759.1A CN105758576B (en) | 2016-03-01 | 2016-03-01 | A kind of Lazer's sensing unit pen type free-field blast pressure "pencil" sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610114759.1A CN105758576B (en) | 2016-03-01 | 2016-03-01 | A kind of Lazer's sensing unit pen type free-field blast pressure "pencil" sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105758576A true CN105758576A (en) | 2016-07-13 |
| CN105758576B CN105758576B (en) | 2019-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610114759.1A Active CN105758576B (en) | 2016-03-01 | 2016-03-01 | A kind of Lazer's sensing unit pen type free-field blast pressure "pencil" sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106644258A (en) * | 2016-12-19 | 2017-05-10 | 西安近代化学研究所 | Shock-wave free-field pressure measuring structure for calibration of shock tube |
| CN108362735A (en) * | 2018-01-23 | 2018-08-03 | 常州大学 | A kind of test device and test method of high-temperature molten metal and water explosive reaction |
| CN112880914A (en) * | 2021-02-05 | 2021-06-01 | 中国船舶科学研究中心 | Pressure sensor used under deepwater explosion condition |
| CN112964413A (en) * | 2021-02-05 | 2021-06-15 | 中国船舶科学研究中心 | Rod-shaped sensor for measuring pressure of underwater explosion free field |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644258A (en) * | 2016-12-19 | 2017-05-10 | 西安近代化学研究所 | Shock-wave free-field pressure measuring structure for calibration of shock tube |
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| CN108362735A (en) * | 2018-01-23 | 2018-08-03 | 常州大学 | A kind of test device and test method of high-temperature molten metal and water explosive reaction |
| CN108362735B (en) * | 2018-01-23 | 2020-11-24 | 常州大学 | Testing device and testing method for high-temperature molten metal and water explosion reaction |
| CN112880914A (en) * | 2021-02-05 | 2021-06-01 | 中国船舶科学研究中心 | Pressure sensor used under deepwater explosion condition |
| CN112964413A (en) * | 2021-02-05 | 2021-06-15 | 中国船舶科学研究中心 | Rod-shaped sensor for measuring pressure of underwater explosion free field |
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| CN105758576B (en) | 2019-03-12 |
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