CN212110425U - Two-way double-measuring-surface pen type pressure sensor - Google Patents
Two-way double-measuring-surface pen type pressure sensor Download PDFInfo
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- CN212110425U CN212110425U CN202020832464.XU CN202020832464U CN212110425U CN 212110425 U CN212110425 U CN 212110425U CN 202020832464 U CN202020832464 U CN 202020832464U CN 212110425 U CN212110425 U CN 212110425U
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Abstract
The utility model discloses a two-way two measuring surface pen type pressure sensor, including two-way water conservancy diversion pole, pressure drag measuring element, high frequency amplifier, bracing piece, cable interface. The two ends of the bidirectional guide rod are of nib streamline structures, two planes which are perpendicular to each other are arranged along the axial direction, a radial blind hole is processed at the same position in the middle of each of the two planes, a first piezoresistive measuring element and a second piezoresistive measuring element are respectively installed on the radial blind hole, a cavity is formed in the bidirectional guide rod, a first high-frequency amplifier and a second high-frequency amplifier are arranged in the cavity, the bottom of the bidirectional guide rod is connected with a support rod, and a cable interface is installed at the bottom of the support rod; the utility model discloses both can be used to the redundant measurement of strong interference environment, break through the position difference that current sensor mounting means arouses, guarantee that the position of two measuring points is unanimous, ensure measured data's accuracy, also can be used to measure in the building through the door and window entrance to a cave entering, opposite direction's shock wave superpressure.
Description
Technical Field
The utility model relates to an explosion shock wave superpressure measurement technical field specifically is a two-way two measuring surface pen type pressure sensor.
Background
The blast is one of the most main destructive effects of explosion, and the overpressure of the blast is a basic parameter for evaluating the destructive capability of the blast and is also an essential measurement parameter for explosion test research. In an actual explosion test, in order to avoid interference of the ground to shock wave propagation, a sensor is often required to be installed at a certain height from the ground, shock wave overpressure time-course data measurement is carried out, and the influence of the sensor on the shock wave propagation is required to be eliminated or reduced as much as possible. Therefore, in the explosion test in the environment without obstacles, a pen-type free-field high-frequency pressure sensor is generally used for measurement, and the sensor is in a pencil shape, wherein one end of the sensor is a tip and is approximately conical, and the other end of the sensor is cylindrical. During measurement, the sensor is arranged on the support, the direction of the tip is aligned to the center of explosion, when explosion shock waves are transmitted to pass through the measuring surface arranged on the penholder, the overpressure (incident pressure) of the shock waves can be measured, and the influence of the streamline nib structure on the propagation of the shock waves can be reduced to the greatest extent, so that accurate overpressure time-course data of the shock waves can be measured.
When the wave front of the explosion shock wave to be measured is complex, such as the shock wave entering the interior of a building through a window opening or the shock wave reflected and diffracted for many times through the wall surface, the roof surface, the beam column surface and the like, not only the overpressure peak value and the duration change, but also the propagation direction at any position becomes uncertain, the existing pen-type sensor can only accurately measure the overpressure time-course data of the shock wave propagating in a single direction, the shock wave propagating and arriving from other directions is not perpendicular to the wave front, and the accuracy of the measured data is obviously reduced.
When a large equivalent explosion test is used for measurement, particularly when the distance from an explosion source is close, the measurement difficulty is increased and the reliability is reduced due to the interference of seismic oscillation, electromagnetism, high temperature and thermal radiation. The arrangement of 2 sensors at the same measuring point and the adoption of redundant measurement are effective solutions to the problems, but in actual measurement, the installation of 2 sensors at the same measuring point is difficult to realize due to the large volume of the pen sensor.
Based on this, the utility model designs a two-way two measuring surface pen type pressure sensor to solve the above-mentioned problem of mentioning.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two-way two measuring surface pen type pressure sensor, this sensor is "T" type structure, the "one" part both ends of structure all are streamlined most advanced, piezoresistive measuring element is respectively installed in two mutually perpendicular's plane middle part same position departments, both can be used to the redundant measurement of strong interference environment, break through the position difference that current sensor mounting means arouses, guarantee the position of two measuring points unanimous, ensure measured data's accuracy, also can be used to measure in the building through the door and window entrance to a cave entering, opposite direction's shock wave superpressure, in order to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a pen-type pressure sensor with two-way and double measuring surfaces comprises a two-way flow guide rod, a piezoresistive measuring element, a high-frequency amplifier, a supporting rod and a cable interface. The bidirectional guide rod is characterized in that pen point streamline structures are adopted at two ends of the bidirectional guide rod, two planes perpendicular to each other are arranged along the axial direction, a radial blind hole is machined in the middle of each plane at the same position, a first piezoresistive measuring element and a second piezoresistive measuring element are installed respectively, the measuring surfaces of the two measuring elements are flush with the two planes of the bidirectional guide rod respectively, a cavity is formed in the bidirectional guide rod, a first high-frequency amplifier and a second high-frequency amplifier are arranged in the cavity, a support rod is connected to the bottom of the bidirectional guide rod, and a cable interface is installed at the bottom of the support rod.
Preferably, the bidirectional guide rod is made of stainless steel materials.
Preferably, the bracing piece is for processing the notch cuttype cylinder that has axial through-hole, bond through the waterproof glue between bracing piece and the two-way water conservancy diversion pole and seal.
Preferably, the first piezoresistive measurement element, the first high-frequency amplifier and the cable interface are connected through signal lines.
Preferably, the second piezoresistive measurement element, the second high-frequency amplifier and the cable interface are connected through signal lines.
Preferably, the first and second piezoresistive measurement elements are each comprised of a thin film piezoresistive material and a bridge.
Preferably, the cable interface is a Q9 connector.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model adopts two piezoresistive measuring elements which are respectively arranged on two mutually perpendicular planes of a bidirectional guide rod, when the two piezoresistive measuring elements are used for measuring the incident pressure of the explosion shock wave in a free field or an infinite space, two overpressure time ranges can be simultaneously collected by the same measuring point and mutually backed up, thus reducing the mounting difficulty and the interference of the sensor and improving the measurement reliability of a strong interference environment; when the device is used for testing a complex shock wave flow field in a building penetrating through a window, the overpressure time course of the shock wave propagating in two opposite directions of a measuring point can be measured simultaneously; the method can also be used for roughly analyzing the shock wave propagation direction at the measuring point according to the data of the measuring result when the shock wave propagation direction cannot be accurately predicted before the test.
2. The two-way guide rod in the utility model is a stainless steel part, has excellent structural strength and installation process stability, has two streamlined pen point ends, and reduces the interference to the impact wave flow field by adopting the guide technology; the mounting point is located the bracing piece of two-way water conservancy diversion pole lower part, and is far away from the measuring face of piezoresistive measurement element, and the reflection wave of mounting department can reach the measuring face of piezoresistive measurement element after the incident wave measurement is accomplished, reduces sensor and installing support to the influence of shock wave propagation to minimum, can be used to free field shock wave superpressure time-course data measurement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the subjective structure of the present invention;
FIG. 2 is a schematic view of the top view structure of the present invention;
fig. 3 is a schematic view of the internal structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a two-way double measuring surface pen type pressure sensor, which comprises: the bidirectional flow guide rod comprises a bidirectional flow guide rod 1, wherein two ends of the bidirectional flow guide rod 1 are of a pen point streamline structure, the pen point type combing structure can reduce the interference of the appearance of a sensor to a shock wave flow field and ensure that a test point meets the free field measurement requirement, two planes 9 are axially processed on the bidirectional flow guide rod 1, the two planes 9 are perpendicular to each other, a radial blind hole 10 is processed at the same position of the two planes 9 and is convenient for installing a piezoresistive measurement element, a cavity 11 is formed in the bidirectional flow guide rod 1, a first piezoresistive measurement element 2 and a second piezoresistive measurement element 3 are arranged in the cavity 11, the first piezoresistive measurement element 2 and the second piezoresistive measurement element 3 are respectively matched with the two radial blind holes 10, the measurement surfaces are respectively flush with the two planes 9, a first high-frequency amplifier 4 and a second high-frequency amplifier 5 are arranged in the cavity 11 and respectively receive voltage signals output by the first piezoresistive measurement element 2 and the second piezoresistive measurement element 3, and amplifying the signal, wherein the bandwidth is 0-150 kHz, the rising time is less than 1 mu s, the bottom of the bidirectional guide rod 1 is connected with a support rod 7, the bottom end of the support rod 7 is provided with a cable interface 8, and the support rod 7 is used for supporting the bidirectional guide rod 1, installing the cable interface 8 and installing and fixing a sensor during testing.
The bidirectional guide rod 1 and the support rod 7 are made of stainless steel materials, and have good structural strength and installation process stability; the support rod 7 is a stepped cylinder with an axial through hole, so that a signal line can pass through the stepped cylinder conveniently, and the support rod 7 is bonded and sealed with the bidirectional guide rod 1 through waterproof glue.
The first piezoresistive measuring element 2, the first high-frequency amplifier 4 and the cable interface 8 are connected through a signal line 6, and the second piezoresistive measuring element 3, the second high-frequency amplifier 5 and the cable interface 8 are connected through a signal line 6.
The first piezoresistive measuring element 2 and the second piezoresistive measuring element 3 are both made of thin-film piezoresistive materials and an electrical bridge, when the piezoresistive measuring element works, a constant voltage is applied to the piezoresistive measuring element by a constant voltage source, when the pressure acting on the surface of the piezoresistive material changes, the resistance of the piezoresistive measuring element changes, the electrical bridge loses balance and outputs a non-zero voltage signal, the magnitude of the voltage signal is in linear relation with the pressure acting on the surface of the piezoresistive material, and the signal is amplified by a built-in amplifier and then output to a measuring instrument by a signal line, so that pressure time-course data is obtained; the cable interface 8 is a Q9 head and is used for providing a constant voltage power supply and measuring voltage signal output for the piezoresistive measuring element and outputting a 0-5V standard voltage signal.
The specific working principle is as follows:
when the device is used, the pen point of the bidirectional guide rod 1 faces the explosion center and is perpendicular to the wave front of the explosion shock wave, the constant voltage power supply and the high frequency signal cable are respectively connected with the cable interface 8 of the sensor, the high frequency signal cable is connected to an oscilloscope or other data recorder, when the shock wave is transmitted to a measuring point after explosion, the resistance of the piezoresistive measuring element is changed under the action of the shock wave, the bridge is out of balance, the output voltage signal is changed in a linear relation with the pressure, the signal is amplified by the high frequency amplifier and then recorded by the oscilloscope or other data recorder, and the measurement and recording of the shock wave overpressure time course data are completed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. The utility model provides a two-way two measuring surface pen type pressure sensor, includes two-way water conservancy diversion pole (1), its characterized in that: the two ends of the bidirectional guide rod (1) are in pen point streamline structures, two planes (9) which are perpendicular to each other are axially processed on the bidirectional guide rod (1), a radial blind hole (10) is processed at the same position of the two planes (9), a cavity (11) is arranged in the bidirectional guide rod (1), a first piezoresistive measuring element (2) and a second piezoresistive measuring element (3) are arranged in the cavity (11), the first piezoresistive measuring element (2) and the second piezoresistive measuring element (3) are respectively matched with two radial blind holes (10), and the measuring surfaces are respectively flush with the two planes (9), a first high-frequency amplifier (4) and a second high-frequency amplifier (5) are arranged in the chamber (11), the bottom of the bidirectional guide rod (1) is connected with a support rod (7), and a cable interface (8) is installed at the bottom end of the support rod (7).
2. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the bidirectional guide rod (1) is made of stainless steel materials.
3. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the support rod (7) is a stepped cylinder with an axial through hole for processing, and the support rod (7) is bonded and sealed with the two-way guide rod (1) through waterproof glue.
4. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the first piezoresistive measuring element (2), the first high-frequency amplifier (4) and the cable interface (8) are connected through a signal line (6).
5. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the second piezoresistive measuring element (3), the second high-frequency amplifier (5) and the cable interface (8) are connected through a signal line (6).
6. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the first piezoresistive measurement element (2) and the second piezoresistive measurement element (3) are both made of a thin film piezoresistive material and a bridge.
7. A bi-directional dual gage pen pressure sensor as claimed in claim 1, wherein: the cable interface (8) is a Q9 head.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020832464.XU CN212110425U (en) | 2020-05-19 | 2020-05-19 | Two-way double-measuring-surface pen type pressure sensor |
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| CN202020832464.XU CN212110425U (en) | 2020-05-19 | 2020-05-19 | Two-way double-measuring-surface pen type pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116183083A (en) * | 2023-03-03 | 2023-05-30 | 西北核技术研究所 | Near-ground omni-directional pressure sensor and shock wave measurement system |
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- 2020-05-19 CN CN202020832464.XU patent/CN212110425U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116183083A (en) * | 2023-03-03 | 2023-05-30 | 西北核技术研究所 | Near-ground omni-directional pressure sensor and shock wave measurement system |
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