CN112394108A - Piezoelectric intelligent sensor for detecting damage of wood structure - Google Patents
Piezoelectric intelligent sensor for detecting damage of wood structure Download PDFInfo
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- CN112394108A CN112394108A CN202011236210.2A CN202011236210A CN112394108A CN 112394108 A CN112394108 A CN 112394108A CN 202011236210 A CN202011236210 A CN 202011236210A CN 112394108 A CN112394108 A CN 112394108A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0238—Wood
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
Abstract
The invention relates to a piezoelectric intelligent sensor for detecting damage of a wood structure, which mainly comprises an upper wood protection shell (1), an upper metal shielding shell notch (2), an upper metal shielding shell (3), an upper piezoelectric ceramic sensor notch (4), an upper piezoelectric ceramic sensor (5), a metal electrode (6), a lower piezoelectric ceramic sensor (7), a lower piezoelectric ceramic sensor notch (8), a lower metal shielding shell (9), a lower metal shielding shell notch (10), a lower wood protection shell (11), a lead (12) and other detailed structures. Because most of the traditional piezoelectric intelligent sensors are wrapped by concrete, the invention overcomes the problem of interface discontinuity caused by pasting and embedding the traditional piezoelectric intelligent sensors in a wood structure, so that acoustic impedances of the sensors and the structure are matched with each other, and the sensors are favorable for transmitting and receiving signals. The method is mainly applied to the field of civil engineering wood structure health detection, and comprises wood structure strength detection, wood structure void detection, wood structure node damage detection, wood structure crack detection and the like. The invention can be embedded into a wood structure connecting node, for example, the invention can be used as a wedge of a mortise and tenon structure, and can be embedded into the mortise and tenon connecting node to realize the health monitoring of the mortise and tenon node of the wood structure.
Description
Technical Field
The invention relates to a piezoelectric intelligent sensor for detecting damage of a wood structure. The method is mainly applied to the field of civil engineering timber structure health detection, and comprises timber structure strength detection, timber structure void detection, timber structure node damage detection, timber structure crack detection and the like. The invention can be embedded into a wood structure connecting node, for example, the invention can be used as a wedge of a mortise and tenon structure, and can be embedded into the mortise and tenon connecting node to realize the health monitoring of the mortise and tenon node of the wood structure.
Background
The existing wood substitute structure has various structural forms and complex structure. The wood structure may suffer from material degradation due to the effects of temperature and humidity during long-term use. For wood structure connecting nodes, particularly for connection of mortise and tenon mechanisms, the problems of node loosening, connection failure and the like are easy to occur under the action of long-term load. Therefore, it is necessary to detect the damage of the wood structure in time.
The existing monitoring means based on an ultrasonic method is mainly to directly bond the piezoelectric ceramic sensor and the wood structure, and the mode is effective for short-time monitoring, but under the condition of long-time monitoring, the piezoelectric ceramic sensor is directly exposed in the air, so that the aging problem is easily caused, the performance of the sensor is influenced, and long-period health monitoring of the wood structure cannot be realized. In addition, most of the existing piezoelectric ceramic sensors with protective cases are used for concrete structures, and for wood structures, the coupling performance of the piezoelectric ceramic sensors and the wood structures is poor, that is, ultrasonic waves generated by the piezoelectric ceramic sensors are seriously damaged between a concrete outer cladding layer and the wood structures, so that the piezoelectric ceramic sensors are not suitable for being directly applied to wood structure health detection, and a sensor capable of achieving good coupling with the wood structures needs to be developed urgently.
Disclosure of Invention
In order to solve the problems, the invention provides the piezoelectric intelligent sensor for detecting the damage of the wood structure, which has good compatibility with the wood structure material, can be adhered to the surface of the wood structure or embedded in the wood structure, and realizes the on-line monitoring of the damage of the wood structure.
1. The technical scheme of the invention is as follows: the utility model provides a timber damage detection's piezoelectricity intelligence sensor, by last timber protective housing (1), go up metal shield shell notch (2), go up metal shield shell (3), go up piezoceramics sensor notch (4), go up piezoceramics sensor (5), metal electrode (6), piezoceramics sensor (7) down, piezoceramics sensor notch (8) down, metal shield shell (9) down, metal shield shell notch (10) down, timber protective housing (11) down, thin portion structures such as wire (12) are constituteed. The method is characterized in that the excitation waveform with higher signal-to-noise ratio is realized by connecting the two pieces of piezoelectric ceramics in parallel.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: go up piezoceramics sensor (5) and have metal shield shell (3) and lower metal shield shell (9) to wrap up in piezoceramics sensor (7) outside down, guarantee that piezoelectricity intelligent sensor can effectively shield noise interference when the receiver uses.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: go up metallic shield shell (3) and metallic shield shell (9) down can bond each other with epoxy glue when embedding metallic shield shell notch (2) and metallic shield shell notch (10) down for the wholeness is better.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: the wire guiding structure comprises an upper wood protection shell (1), an upper metal shielding shell (3), a lower metal shielding shell (9) and a lower wood protection shell (11), wherein a wire channel is reserved, and a wire can be led from the side surface or the top of the upper wood protection shell (1) or the bottom of the lower wood protection shell (11);
the piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: the upper wood protection shell (1) and the lower wood protection shell (11) can be changed according to a detection wood structure object. May be square, diamond or other polygonal shape. For the surface sticking mode, the thicknesses of the upper wood protection shell (1) and the lower wood protection shell (11) can be smaller. For the inner part of the embedded wood structure or the inner form of the tenon-and-mortise joint, the thicknesses of the upper wood protection shell (1) and the lower wood protection shell (11) can be larger.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: the inner diameter of the notch (2) of the upper metal shielding shell is the same as the outer diameter of the upper metal shielding shell (3), and the inner diameter of the notch (4) of the upper piezoelectric ceramic sensor is the same as the outer diameter of the upper piezoelectric ceramic sensor (5). Similarly, the outer diameter of the lower piezoelectric ceramic sensor (7) is the same as that of the notch (8) of the lower piezoelectric ceramic sensor, and the outer diameter of the lower metal shielding shell (9) is the same as that of the notch (10) of the lower metal shielding shell.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: the upper wood protection shell (1) and the lower wood protection shell (11) can be bonded into a whole by using epoxy resin.
The piezoelectric intelligent sensor for detecting damage of the wood structure is characterized in that: the piezoelectric intelligent sensor can be used as an exciter to excite an ultrasonic signal and can also be used as a receiver to receive the ultrasonic signal.
The invention overcomes the inherent defects in the coupling process of the traditional piezoelectric intelligent sensor and the wood structure, and has the following beneficial effects:
(1) the piezoelectric ceramic sensor is shielded by the metal shielding shell, so that the piezoelectric ceramic is beneficial to shielding electromagnetic interference in the process of exciting and sensing signals, and the signal to noise ratio is high;
(2) the outermost layer is wrapped by a wood protective shell and can be adhered or embedded into the surface or the interior of a wood structure, so that the sensor and the wood structure can be better integrated, materials on two sides of a connecting interface are uniform, acoustic impedance is matched, and propagation of ultrasonic waves is facilitated;
(3) the invention can be used as a wedge for mortise and tenon connection and embedded into a mortise and tenon joint of a wood structure, thereby realizing effective detection of the node;
description of the drawings:
(1) fig. 1 is a configuration diagram of a main portion of the present piezoelectric smart sensor;
(2) FIG. 2 is a vertical sectional view of the main portion of the present piezoelectric smart sensor;
(3) FIG. 3 is a sectional view taken along line a-a of the main portion of the piezoelectric smart sensor;
in fig. 1 to 3, 1 is a wood protective case, 2 is an upper metal shielding case notch, 3 is an upper metal shielding case, 4 is an upper piezoelectric ceramic sensor notch, 5 is an upper piezoelectric ceramic sensor, 6 is a metal electrode, 7 is a lower piezoelectric ceramic sensor, 8 is a lower piezoelectric ceramic sensor notch, 9 is a lower metal shielding case, 10 is a lower metal shielding case notch, 11 is a lower wood protective case, and 12 is a wire.
The specific implementation mode is as follows:
in order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
As shown in figures 1-3, the piezoelectric intelligent sensor for detecting damage of a wood structure mainly comprises an upper wood protection shell (1), an upper metal shielding shell notch (2), an upper metal shielding shell (3), an upper piezoelectric ceramic sensor notch (4), an upper piezoelectric ceramic sensor (5), a metal electrode (6), a lower piezoelectric ceramic sensor (7), a lower piezoelectric ceramic sensor notch (8), a lower metal shielding shell (9), a lower metal shielding shell notch (10), a lower wood protection shell (11), a lead (12) and other detailed structures
The invention provides a piezoelectric intelligent sensor for detecting damage of a wood structure, which is prepared by welding the positive electrode of a lead (12) and a metal electrode (6). Then the upper piezoelectric ceramic sensor (5) and the lower piezoelectric ceramic sensor (7) are concentrically arranged with the metal electrode (6). The piezoelectric ceramic sensor (5), the lower piezoelectric ceramic sensor (7) and the metal electrode (6) are wrapped and compacted through the upper metal shielding shell (3) and the lower metal shielding shell (9), and the piezoelectric ceramic sensor and the metal electrode are bonded through epoxy resin. And after solidification, welding the negative electrode of the lead (12) with the upper metal shielding shell (3) and the lower metal shielding shell (9). And finally, coating epoxy resin inside the upper wood protection shell (1) and the lower wood protection shell (11) and protecting the upper wood protection shell and the lower wood protection shell by compacting.
The invention relates to a piezoelectric intelligent sensor for detecting damage of a wood structure, which can be used for sticking a plurality of sensors on the surface of the wood structure, wherein one sensor transmits signals, and the other sensors receive signals. Or the damage on the surface or inside of the wood structure is monitored and detected in a mode that a single sensor firstly transmits a signal and then receives the signal.
Claims (8)
1. The invention relates to a piezoelectric intelligent sensor for detecting damage of a wood structure, which is characterized in that: mainly by last timber protective housing (1), go up metal shield shell notch (2), go up metal shield shell (3), go up piezoceramics sensor notch (4), go up piezoceramics sensor (5), metal electrode (6), piezoceramics sensor (7) down, piezoceramics sensor notch (8) down, metal shield shell (9) down, metal shield shell notch (10) down, timber protective housing (11) down, thin and detailed structure such as wire (12) constitute.
2. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: the positive electrode of the upper piezoelectric ceramic sensor (5) is contacted with the metal electrode (6), and the positive electrode of the lower piezoelectric ceramic sensor (7) is contacted with the metal electrode (6), so that the positive electrodes of the upper piezoelectric ceramic sensor (5) and the lower piezoelectric ceramic sensor (7) are opposite and face to one side of the metal electrode (6). The purpose of placing in this way is that two piezoceramics sensors of parallel connection realize the simultaneous excitation for the stress wave energy that the excitation formed is higher.
3. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: go up piezoceramics sensor (5) and piezoceramics sensor (7) down can select for use different sensor types according to detecting the functional difference, detect timber structure internal defect and can select for use D33 type piezoceramics sensor, detect timber structure surface defect and can select for use D15 type sensor.
4. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: the positive pole of the lead (12) is connected with the metal electrode (6), and the negative pole is connected with the upper piezoelectric ceramic sensor (5) and the lower piezoelectric ceramic sensor (7) or connected with the upper metal shielding shell (3) and the lower metal shielding shell (9).
5. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: go up metallic shield shell (3) and metallic shield shell (9) down can bond each other with epoxy glue when embedding metallic shield shell notch (2) and metallic shield shell notch (10) down for the wholeness is better.
6. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: the wire guiding structure comprises an upper wood protection shell (1), an upper metal shielding shell (3), a lower metal shielding shell (9) and a lower wood protection shell (11), wherein a wire channel is reserved, and a lead can be led from the side surface and also can be led from the top of the upper wood protection shell (1) or the bottom of the lower wood protection shell (11).
7. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: the upper wood protection shell (1) and the lower wood protection shell (11) can be changed according to a detection wood structure object. May be square, diamond or other polygonal shape. For the surface sticking mode, the thicknesses of the upper wood protection shell (1) and the lower wood protection shell (11) can be smaller. For the inner part of the embedded wood structure or the inner form of the tenon-and-mortise joint, the thicknesses of the upper wood protection shell (1) and the lower wood protection shell (11) can be larger.
8. A piezoelectric smart sensor for damage detection of wooden structures as claimed in claim 1, wherein: the piezoelectric intelligent sensor can be used as an exciter to excite an ultrasonic signal and can also be used as a receiver to receive the ultrasonic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236210.2A CN112394108A (en) | 2020-11-03 | 2020-11-03 | Piezoelectric intelligent sensor for detecting damage of wood structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011236210.2A CN112394108A (en) | 2020-11-03 | 2020-11-03 | Piezoelectric intelligent sensor for detecting damage of wood structure |
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| Publication Number | Publication Date |
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| CN112394108A true CN112394108A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011236210.2A Pending CN112394108A (en) | 2020-11-03 | 2020-11-03 | Piezoelectric intelligent sensor for detecting damage of wood structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552220A (en) * | 2021-08-13 | 2021-10-26 | 同济大学 | Reinforced concrete structure health monitoring system |
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2020
- 2020-11-03 CN CN202011236210.2A patent/CN112394108A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552220A (en) * | 2021-08-13 | 2021-10-26 | 同济大学 | Reinforced concrete structure health monitoring system |
| CN113552220B (en) * | 2021-08-13 | 2022-09-13 | 同济大学 | Reinforced concrete structure health monitoring system |
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